TW201720892A - Pressure-sensitive adhesive sheet and release film-supported pressure-sensitive adhesive sheet - Google Patents

Abstract

Provided is a PSA sheet having a PSA layer. The PSA sheet has a first face and a second face. The first face is a first adhesive face formed of one surface of the PSA layer. The first adhesive face has a 10-point mean roughness of 1000 nm or less. The PSA layer has a storage modulus of 0.08 MPa or greater at 100 DEG C.

Description

Adhesive sheet and adhesive sheet with release film

The present invention relates to an adhesive sheet and an adhesive sheet with a release film.

In general, an adhesive (also referred to as a pressure-sensitive adhesive. The same applies hereinafter) has a property of exhibiting a soft solid (viscoelastic body) in a temperature region near room temperature, which can be easily followed by pressure. In the body. By effectively utilizing this property, the adhesive is widely used in various industrial fields such as automobiles, OA (Office Automation) equipment, and the like, in the form of an adhesive sheet containing a layer of the adhesive. The adhesive sheet has a high degree of smoothness to the adhesive surface (the surface of the adhesive layer). An example of such an adhesive sheet is an adhesive sheet for optical use. As a technical document for preventing the occurrence of irregularities on the surface of the adhesive layer, Japanese Patent Application Laid-Open No. 2014-189778 is hereby incorporated. International Publication No. 2014/156335 is a technical document relating to a double-sided adhesive sheet having a release film having a high surface smoothness.

In general, from the viewpoints of convenience of circulation or productivity, in many cases, an adhesive sheet (especially an adhesive sheet for industrial use) is formed into a spiral shape in which a strip of adhesive sheet is formed into a long strip. Or a relatively large area of the sheet shape. Thereafter, various processes or treatments can be applied to the adhesive sheet during the final attachment to each of the adherends. As an example of the processing or the treatment, the shape of the adhesive sheet may be adapted to be processed by the shape of the adherend by punching or cutting, or the adhesive sheet may be prepared to be attached to the adherend. The processing of the form of efficiency or high precision. During such processing or processing, the release film that protects the adhesive side of the adhesive sheet is sometimes replaced. That is, a release film may be removed from the adhesive surface of the adhesive sheet, and the release surface of the other release film may be bonded to the exposed adhesive surface. Therefore, the release film existing on the adhesive surface of the adhesive sheet to be attached to the adherend may be a release film different from the release film existing on the adhesive surface when the adhesive sheet is initially produced. With the diversification, miniaturization, large screen, and design improvement of optical products in recent years, there is an opportunity to replace the release film on the adhesive surface during the period before the attached adhesive sheet is attached to the adherend. Or the tendency to increase its necessity. However, as described above, since the adhesive is a viscoelastic body, even if it is an adhesive sheet which is initially manufactured with a highly smooth adhesive surface, the smoothness of the adhesive surface may be lowered by the subsequent treatment (coarse ()). For example, when the release film that protects the highly smooth adhesive surface is replaced with another release film, the smoothness of the adhesive surface may be lowered by the replacement of the release film. Accordingly, it is an object of the present invention to provide an adhesive sheet having a highly smooth adhesive surface and which is less susceptible to smoothness of the adhesive surface. A related object is to provide an adhesive sheet having a release film having a release film on the adhesive surface of such an adhesive sheet. The present inventors have found that for an adhesive sheet having a highly smooth adhesive surface, the storage elastic modulus at 100 ° C by focusing on the adhesive layer constituting the highly smooth adhesive surface (100 ° C) The above problems can be solved, and the present invention has been completed. According to the present specification, there is provided an adhesive sheet comprising an adhesive layer. The adhesive sheet has a first surface and a second surface. The first surface is a first adhesive surface composed of one surface of the pressure-sensitive adhesive layer. The ten-point average roughness (Rz _A1 ) of the first adhesive surface is about 1000 nm or less. The 100 ° C storage elastic modulus (G' ₁₀₀ ) of the above adhesive layer is about 0.08 MPa or more. Since the adhesive sheet has a highly smooth first adhesive surface and the G' ₁₀₀ of the adhesive layer constituting the first adhesive surface is high, the smoothness of the first adhesive surface tends to be less likely to be impaired. Therefore, the above adhesive sheet is suitable for applications requiring a highly smooth adhesive surface (for example, optical use). In one aspect of the technology disclosed herein, the 100 ° C storage elastic modulus (G' ₁₀₀ ) of the adhesive layer is a 23 ° C storage elastic modulus of the adhesive layer (storage elastic modulus at 23 ° C; G About ₂₃ % of _'23 ). That is, the 100 ° C / 23 ° C storage elastic modulus ratio (G' ₁₀₀ /G' ₂₃ ) of the above adhesive layer is about 35% or more. When the adhesive sheet having such an adhesive layer is used, it is preferable to maintain both the performance of maintaining the smoothness of the first adhesive surface and the workability at room temperature. The upper limit of G' ₁₀₀ /G' ₂₃ is not particularly limited and is usually about 100% or less. In one aspect of the technique disclosed herein, the 23 ° C storage elastic modulus (G' ₂₃ ) of the above adhesive layer is less than about 0.30 MPa. The adhesive sheet having such an adhesive layer tends to exhibit good initial adhesion at room temperature. In one aspect of the technology disclosed herein, the second surface of the adhesive sheet is a second adhesive surface. That is, the adhesive sheet of this aspect is configured as a double-sided adhesive sheet in which the first surface and the second surface are both adhesive surfaces. Such a double-sided adhesive sheet can be preferably used for the purpose of, for example, joining or fixing members. In one aspect, the ten-point average roughness (Rz _A2 ) of the second adhesive surface may be about 2000 nm or less (preferably about 1000 nm or less). The double-sided adhesive sheet having such a second adhesive surface is suitable for applications requiring a highly smooth adhesive surface. In one aspect of the technology disclosed herein, the second surface may be a second adhesive surface formed by the other surface of the adhesive layer. That is, one surface and the other surface of the above-mentioned adhesive layer constitute a first adhesive surface and a second adhesive surface of the adhesive sheet, respectively. The adhesive sheet of this aspect is suitable for improvement in optical characteristics (for example, transparency) because of its simple structure. In one aspect, the ten-point average roughness (Rz _A2 ) of the second adhesive surface of the second adhesive surface may be about 2000 nm or less (for example, about 1000 nm or less). Since the adhesive sheet has a highly smooth second adhesive surface and the G' ₁₀₀ of the adhesive layer constituting the second adhesive surface is high, the smoothness of the second surface tends to be less likely to be impaired. Therefore, it is suitable for applications requiring a highly smooth adhesive surface. Further, according to the present specification, there is provided an adhesive sheet with a release film comprising any of the adhesive sheets disclosed herein and a first release film disposed on the first adhesive surface of the adhesive sheet. The adhesive sheet constituting the adhesive sheet with such a release film can be preferably used in such a manner that it is attached to the process by replacing the first release film with another release film (replacement and attachment) as needed. Follow the body. In this manner, the adhesive sheet having the release film of the first release film on the first adhesive surface is preferably a ten-point average roughness (Rz _R1 ) of the release surface of the first release film that is in contact with the first adhesive surface. The difference between the ten-point average roughness (Rz _A1 ) of the first adhesive surface is within 250 nm. That is, |Rz _{R1 -} Rz _A1 | is preferably 250 nm or less. Since the adhesive sheet with such a peeling film has a good adhesiveness with the peeling surface of the first peeling film and the first adhesive surface, it tends to be excellent in appearance quality. Hereinafter, the peeling surface which is in contact with the first adhesive surface may be referred to as a "first peeling surface". Further, the peeling surface that comes into contact with the second adhesive surface may be referred to as a "second peeling surface". Moreover, according to the present specification, there is provided an adhesive sheet with a release film comprising any of the double-sided adhesive sheets disclosed herein, a first release film disposed on a first adhesive surface of the adhesive sheet, and disposed on The second release film on the second adhesive surface of the adhesive sheet. The double-sided adhesive sheet constituting the adhesive sheet with such a release film can be preferably used in such a manner that one or both of the first release film and the second release film are replaced with other ones as needed. The process of peeling off the film is attached to the adherend. In this manner, the adhesive sheet (the double-sided adhesive sheet with the release film) including the double-sided adhesive sheet, the first release film, and the release film of the second release film may be the first release film in a preferred embodiment. The difference between the ten point average roughness (Rz _R1 ) of the first peeling surface and the ten point average roughness (Rz _A1 ) of the first adhesive surface is 250 nm or less, and the second peeling surface of the second peeling film The difference between the ten point average roughness (Rz _R2 ) and the ten point average roughness (Rz _A2 ) of the above second adhesive surface is within 250 nm. That is, |Rz _{R1 -} Rz _A1 | is 250 nm or less, and |Rz _{R2 -} Rz _A2 | is within 250 nm. In this aspect, the adhesive sheet with the release film has good adhesion between the release surface of the first release film and the first adhesive surface, and the adhesion between the release surface of the second release film and the second adhesive surface. Excellent tendency.

Hereinafter, preferred embodiments of the present invention will be described. In addition, matters necessary for the implementation of the present invention other than those specifically mentioned in the present specification can be understood based on the description of the implementation of the invention and the technical common sense at the time of application. The present invention can be implemented based on the contents disclosed in the present specification and the technical common knowledge in the field. In the following description, members and portions that perform the same functions are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified. Further, the embodiments described in the drawings are schematically illustrated to clearly illustrate the present invention, and do not necessarily accurately indicate the size or scale of the product actually provided. In the present specification, the term "adhesive" means a material having the following properties: a state in which a soft solid (viscoelastic body) is present in a temperature region near room temperature, which can be simply followed by pressure. body. The term "adhesive" as defined herein is defined in "CA Dahlquist, "Adhesion: Fundamental and Practice", McLaren & Sons, (1966) P. 143". In general, it may have a complex tensile modulus E*. (1 Hz) <10 ⁷ Dyne/cm ² A material of the nature (typically a material having the above properties at 25 ° C). In the present specification, the "adhesive surface" refers to a SUS304 stainless steel plate as a member to be bonded according to JIS Z0237 (2004), and a roller of 2 kg is reciprocated once in a measurement environment of 23 ° C to be crimped to the above-mentioned adherend. After 30 minutes, the peel strength at the time of peeling in the 180-degree direction at a tensile speed of 300 mm/min was 0.1 N/20 mm or more. In the present specification, the term "non-adhesive surface" means a surface which does not belong to the above-mentioned adhesive surface, and typically refers to a surface having a peeling strength of less than 0.1 N/20 mm. The 2 kg roller was reciprocated once in a measurement environment of 23 ° C and was not attached to the surface of the stainless steel plate when pressed against the SUS304 stainless steel plate (substantially showing no adhesive surface). A typical example included in the concept. <Adhesive Sheet> The adhesive sheet disclosed herein is formed into a sheet shape having a first surface and a second surface (in the form of a strip shape such as a strip shape). The above adhesive sheet contains at least an adhesive layer. The adhesive sheet disclosed herein may be composed only of an adhesive layer, and may be composed of constituent elements other than the adhesive layer. The first surface of the adhesive sheet disclosed herein is an adhesive surface (first adhesive surface) composed of one surface of the above-mentioned adhesive layer. The second surface of the adhesive sheet may be an adhesive surface or a non-adhesive surface. In the adhesive sheet of one aspect, the second surface of the adhesive sheet is an adhesive surface (second adhesive surface) composed of the other surface of the adhesive layer. That is, one surface and the other surface of one adhesive layer constitute a first adhesive surface and a second adhesive surface of the adhesive sheet, respectively. An example of the constitution of the adhesive sheet of this aspect is shown in Fig. 1. The adhesive sheet 1 shown in Fig. 1 is a substrate-free double-sided adhesive sheet comprising an adhesive layer 11. The first surface 1A of the adhesive sheet 1 is a first adhesive surface composed of one surface 11A of the adhesive layer 11, and the second surface 1B of the adhesive sheet 1 is composed of the other surface 11B of the adhesive layer 11 Adhesive surface. The adhesive layer 11 may have a single layer structure or a multilayer structure including two or more sub-adhesive layers. The constitution (material, thickness, and the like) of each of the sub-adhesive layers constituting the multilayer structure may be the same or different. From the viewpoint of productivity or transparency, the adhesive layer 11 can be preferably used in the form of a single layer structure. Here, the non-substrate double-sided adhesive sheet refers to a double-sided adhesive sheet which does not include a non-releasable support substrate between the first adhesive surface and the second adhesive surface. The above support substrate means a substrate capable of independently maintaining a shape. Further, the non-releasable supporting substrate refers to a supporting substrate which is not intended to be separated from the adhesive layer during use of the adhesive sheet containing the supporting substrate. For example, as shown in FIG. 1, the adhesive sheet 1 before use (that is, before being attached to the adherend) may be the first peeling film 21 and the second peeling film, respectively, of the first adhesive surface 1A and the second adhesive surface 1B. 22 forms of protection. The surface 21A of the first release film 21 that is in contact with the first adhesive surface 11A and the surface 22A of the second release film 22 that is in contact with the second adhesive surface 11B are both a peeling surface (a peelable surface, that is, the surface can be peeled off from the surface The surface of the adhesive layer). The adhesive sheet 1 of this type is also understood to include the first release film 21 and the surface (the first adhesive film 1) having the surface (first release surface) 21A in contact with the first adhesive surface 11A. The 2 peeling surface 22A is a component of the adhesive sheet (the double-sided adhesive sheet with a peeling film) 100 of the peeling film attached to the 2nd peeling film 22 arrange|positioned by the 2nd adhesive surface 12A. The adhesive sheet 100 with a release film may also be wound in a spiral shape. As another form of the adhesive sheet 1 before use, the release film 22 shown in FIG. 1 is omitted, and the release film 21 in which the surface 21A and the back surface 21B are both peeling surfaces are overlapped with the adhesive sheet 1 and rolled up. The spiral shape is wound, whereby the second adhesive surface 11B is brought into contact with the back surface 21B of the release film 21. An example of one of the adhesive sheets in which the second surface is a non-adhesive surface is shown in Fig. 2 . The adhesive sheet 2 shown in FIG. 2 is configured as a single-sided adhesive sheet including a support substrate 15 having a first surface 15A and an adhesive substrate 11 disposed on the first surface 15A of the support substrate 15. material. Here, the first surface 15A of the support substrate 15 is a non-releasable surface, that is, a non-peeling surface. The first surface 2A of the adhesive sheet 2 is a first adhesive surface composed of one surface 11A of the adhesive layer 11, and the second surface 2B of the adhesive sheet 2 is non-adhered by the second surface 15B of the support substrate 15. surface. The second surface 15B may be a peeling surface or a non-peeling surface. For example, as shown in FIG. 2, the adhesive sheet 2 before use can be in the form of protecting the first adhesive surface 11A by the first release film 21. The adhesive sheet 2 of this type is also understood to include the adhesive sheet 2, and the release film of the first release film 21 in which the surface (first release surface) 21A is in contact with the first adhesive surface 11A. The constituent elements of the adhesive sheet (single-sided adhesive sheet with a release film) 200. The adhesive sheet 200 with a release film may be in a form of being wound into a spiral shape. As another configuration example of the adhesive sheet disclosed herein, a support substrate having a non-releasable first surface and a second surface is provided, and the first surface of the support substrate has a first adhesive. The layer has a structure of a double-sided adhesive sheet with a base material of a second adhesive layer on the second surface of the support substrate. In the double-sided adhesive sheet with the base material, the first surface of the double-sided adhesive sheet is a first adhesive surface composed of the surface of the first adhesive layer, and the second surface of the double-sided adhesive sheet The second adhesive surface is composed of the surface of the second adhesive layer. The composition and configuration of the first adhesive layer and the second adhesive layer may be the same, and one or both of the composition and the composition may be different. Examples of the first adhesive layer and the second adhesive layer having the same composition and different constitutions include a thickness in which the first adhesive layer and the second adhesive layer are composed of the same adhesive composition. Different aspects of the adhesive layer. The first adhesive layer and the second adhesive layer may each independently have a single layer structure, or may have a multilayer structure including two or more sub-adhesive layers. From the viewpoint of productivity or transparency, it is preferable to adopt a state in which the first adhesive layer and the second adhesive layer are both single-layer structures. The double-sided adhesive sheet with the base material before use can be the first adhesive surface (the surface of the first adhesive layer) and the second adhesive in the same manner as the baseless double-sided adhesive sheet 1 shown in Fig. 1 . The surface is protected by the first release film and the second release film. The double-sided adhesive sheet attached to the substrate in this form is also understood to be a constituent element of the adhesive sheet including the adhesive sheet, the first release film, and the release film attached to the second release film. The adhesive sheet with the release film may be in a form of being wound into a spiral shape. Further, the double-sided adhesive sheet to which the base material is attached before use may be in a form in which a release film having a double-faced release surface is superposed on the adhesive sheet and wound into a spiral shape. In the adhesive sheet comprising the support substrate in the case of the one-side adhesive sheet or the double-sided adhesive sheet attached to the substrate as described above, the material of the support substrate is not particularly limited. As the support substrate, for example, a plastic film, paper, woven fabric, non-woven fabric, rubber sheet, foam sheet, metal foil, glass, a composite of these, or the like can be used. For the surface on which the adhesive layer is provided in the support substrate, surface treatment such as coating of a primer, corona discharge treatment, or plasma treatment may be performed. Further, in the present specification, the plastic film is typically a non-porous sheet which is different from, for example, a non-woven fabric (i.e., does not contain a nonwoven fabric). In one aspect, as the support substrate, it is easy to realize a highly smooth first adhesive surface, and the like, and various plastic films can be preferably used. Examples of the material of the plastic film include a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, a cellulose resin such as triacetyl cellulose, an acetate resin, and a polyfluorene. Resin, polyether oxime resin, polycarbonate resin, polyamine resin, polyimide resin, polyolefin resin, cyclic polyolefin resin (meth) resin, etc., (meth)acrylic resin, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, polyvinyl alcohol resin, polyarylate resin, polyphenylene sulfide Resin, mixtures of these, and the like. Among them, preferred examples of the material include a polyester resin, a cellulose resin, a polyimide resin, and a polyether oxime resin. In the plastic film for supporting the substrate, a known additive can be blended in the same manner as the plastic film for the release film substrate described later. A plastic film having transparency is preferred. The thickness of the support substrate is not particularly limited and may be appropriately selected depending on the purpose. In one aspect, the thickness of the support substrate can range from about 10 μm to about 500 μm, and is usually from about 10 μm to about 300 μm. In one aspect, a support substrate (for example, the above transparent plastic film) having a thickness of from about 15 μm to about 200 μm can be preferably used. (10-point average roughness) The adhesive sheet disclosed herein is preferably a ten-point average roughness of the first adhesive face (Rz _A1 ) is below about 1000 nm. The adhesive sheet having such a first adhesive surface is suitable for applications requiring a highly smooth adhesive surface. For example, the aspect in which the first adhesive surface is attached to the optical member can be preferably used. In terms of providing a smoother adhesive surface, Rz _A1 It may preferably be about 700 nm or less, more preferably about 500 nm or less, still more preferably about 300 nm or less (for example, about 200 nm or less). Rz _A1 The lower limit is not particularly limited. In one aspect, Rz can be _A1 Set to about 30 nm or more (for example, about 50 nm or more). Here, in the present specification, the ten-point average roughness means a ten-point average roughness obtained by using a non-contact surface roughness measuring device unless otherwise specified. As the non-contact surface roughness measuring device, a surface roughness measuring device using an optical interference method is used. As a specific measuring device, Wyko NT-9100 manufactured by Veeco Co., Ltd. or its equivalent can be used. The specific measurement operation and measurement conditions can be set according to the measurement conditions described in the examples below, or can be set so as to obtain results equivalent to or corresponding to the conditions according to the measurement conditions. The ten point average roughness is the roughness curve obtained by the above surface roughness measurement, and the peak height (Yp1 to Yp10) from the highest peak to the tenth position and the lowest bottom to the tenth The average height (Yv1 to Yv10) of the bottom of the bit is obtained, and the average value of the absolute values of the differences between the above Yp1 to Yp10 and the above Yv1 to Yv10 is obtained. When the adhesive sheet disclosed herein is in the form of a double-sided adhesive sheet (that is, an adhesive sheet having a first adhesive surface and a second adhesive surface), the ten-point average roughness of the second adhesive surface (Rz) _A2 ) is not particularly limited. In one of the preferred aspects, Rz _A2 It may be set to be about 2000 nm or less (typically, about 1000 nm or less, preferably about 700 nm or less, more preferably about 500 nm or less, still more preferably about 300 nm or less, for example, about 200 nm or less). Rz _A2 The lower limit is not particularly limited. In one aspect, Rz can be _A2 Set to about 30 nm or more (for example, about 50 nm or more). The second adhesive surface may be the other surface of the adhesive layer constituting the first adhesive surface on one surface, or may be the surface of the adhesive layer different from the adhesive layer constituting the first adhesive layer. (Storage Elastic Modulus) The adhesive sheet disclosed herein is preferably a 100 ° C storage elastic modulus (G' of the adhesive layer constituting the first adhesive face. ₁₀₀ ) is about 0.08 MPa or more. The adhesive sheet having such an adhesive layer is less likely to be damaged in smoothness of the first adhesive surface after the adhesive sheet is produced. For example, after the adhesive sheet is produced and the adhesive sheet is attached to the adherend, even if the release film on the first adhesive surface is replaced with a lower smoothness, the smoothing of the first adhesive surface is suppressed. The tendency to reduce sexuality. The reason for this is considered to be that when the deformation of the adhesive layer after the release film of the adhesive sheet temporarily produced is replaced (replaced and attached) at a low speed, the elastic modulus of the adhesive layer can be appropriately grasped according to the storage modulus of 100 ° C. The behavior of the adhesive layer which is plastically deformed at a low speed (time-temperature changing algorithm) can be efficiently realized by replacing the peeling film by setting the above-described 100 ° C storage elastic modulus to a specific value or more. 1 Adhesive sheet with reduced smoothness of the adhesive surface. In the technique disclosed herein, G' ₁₀₀ It may be about 0.09 MPa or more, may be about 0.10 MPa or more, or may be about 0.11 MPa or more (for example, about 0.12 MPa or more). By raising G' ₁₀₀ There is a tendency to better maintain the smoothness of the first adhesive surface. The upper limit of G'100 is not particularly limited, and may be, for example, about 1.5 MPa or less (typically about 1.0 MPa or less). In terms of the adhesion of the adherend, etc., G' ₁₀₀ It is usually preferably less than about 0.50 MPa, preferably less than about 0.40 MPa, and more preferably less than about 0.30 MPa. G' ₁₀₀ The composition of the adhesive layer (for example, the composition or molecular weight of the polymer contained in the adhesive layer, the aspect of crosslinking, the crosslinking density, whether or not the additive is used and the amount used), or the manufacturing method, etc. And make adjustments. In one aspect of the technique disclosed herein, the 23 ° C storage elastic modulus (G' of the adhesive layer constituting the first adhesive face of the adhesive sheet can be used. _{twenty three} ) Set to less than approximately 0.30 MPa. The adhesive sheet having such an adhesive layer tends to exhibit good initial adhesion to the adherend at room temperature. In this case, it is preferable from the viewpoint of adhesion workability (for example, work efficiency or attachment accuracy) of the adhesive sheet. In one aspect, G' _{twenty three} It can be set to about 0.29 MPa or less, about 0.27 MPa or less, or about 0.25 MPa or less. By lowering G' _{twenty three} There is a tendency to improve the initial adhesion of the adhesive sheet. G' _{twenty three} The lower limit is not particularly limited and may be, for example, about 0.05 MPa or more. In terms of the ease of taking into account the specific G'100, G' is usually _{twenty three} It is preferably about 0.08 MPa or more, preferably about 0.10 MPa or more, more preferably about 0.15 MPa or more (for example, about 0.17 MPa or more). G' _{twenty three} Adjustment can be made by the composition of the adhesive layer, the manufacturing method, and the like. Furthermore, in the technique disclosed herein, the storage elastic modulus (G' at 100 ° C as an adhesive layer ₁₀₀ ) and 23 ° C storage elastic modulus (G' _{twenty three} The values of the storage elastic modulus at 100 ° C and 23 ° C obtained by dynamic viscoelasticity measurement of the adhesive constituting the adhesive layer can be used. As a specific measuring device, ARES manufactured by TA Instruments or its equivalent can be used. The specific measurement operation and measurement conditions can be set according to the measurement conditions described in the examples below, or can be set so as to obtain results equivalent to or corresponding to the conditions according to the measurement conditions. The technique disclosed herein can constitute a 100 ° C / 23 ° C storage elastic modulus ratio (G' of the adhesive layer of the first adhesive face. ₁₀₀ /G' _{twenty three} More than about 30% (e.g., about 31% or more) is preferred. In view of better maintaining the smoothness of the first adhesive surface and the workability at room temperature, G' ₁₀₀ /G' _{twenty three} It may be about 35% or more, may be about 40% or more, or may be about 50% or more (for example, about 55% or more). G' ₁₀₀ /G' _{twenty three} The upper limit is not particularly limited and is usually about 100% or less, and typically is less than about 100%. In terms of further improving the workability at room temperature, G' ₁₀₀ /G' _{twenty three} It can be set to about 90% or less, or about 80% or less (for example, about 70% or less). In one aspect, G' can be ₁₀₀ /G' _{twenty three} It is set to be about 35% to about 50%. Such an adhesive layer tends to easily form a highly smooth first adhesive surface. In one aspect of the technique disclosed herein, the 100 ° C storage elastic modulus (G' of the adhesive layer constituting the first adhesive face ₁₀₀ Relative to the thickness of the adhesive layer (T _A1 The ratio can be about 9 MPa/mm or less. With such a G' ₁₀₀ /T _A1 Adhesive sheets with adhesive layers below a certain value have G' ₁₀₀ /T _A1 A larger adhesive layer tends to exhibit good adhesion in the long term, and is therefore preferred. For example, if you use G' ₁₀₀ It is about 0.08 MPa or more (typically about 0.08 MPa or more and less than about 0.50 MPa) and G' ₁₀₀ /T _A1 When the adhesive layer is about 9 MPa/mm or less, the following adhesive sheet can be realized: even if the release film on the first adhesive surface is replaced with a lower smoothness, the smoothness of the first adhesive surface is less susceptible to It is damaged, and it is excellent in the long-term adhesion to the adherend. In terms of getting better results, in one aspect, G' can be ₁₀₀ /T _A1 It is set to be about 7.0 MPa/mm or less. The techniques disclosed herein can be, for example, G' ₁₀₀ /T _A1 The aspect of about 5.0 MPa/mm or less (for example, about 3.0 MPa/mm or less) is preferably carried out. G' ₁₀₀ /T _A1 The lower limit is not particularly limited, but is usually preferably about 0.1 MPa/mm or more. In the technique disclosed herein, the thickness of the adhesive layer constituting the first adhesive face (T _A1 ) is not particularly limited. T _A1 It may be, for example, from about 1 μm to about 500 μm (typically from about 1 μm to about 250 μm). In one aspect, T _A1 It may be about 5 μm or more, or may be about 15 μm or more. If T _A1 When the peeling film on the first adhesive surface is replaced with a lower smoothness, the smoothness of the first adhesive surface tends to be lowered. Therefore, it is more important to suppress the decrease in the smoothness of the first adhesive surface by applying the technique disclosed herein. In this regard, the technology disclosed herein can be T _A1 The aspect of more than about 20 μm (more preferably about 25 μm or more, further preferably about 30 μm or more, for example, about 40 μm or more) is preferably carried out. Also, if T _A1 When the size is small, the smoothness of the first adhesive surface tends to have a greater influence on the properties of the entire adhesive sheet. In this regard, the technology disclosed herein can be T _A1 The aspect of about 250 μm or less (more preferably about 150 μm or less, for example, about 100 μm or less) is preferably carried out. In one aspect, T _A1 It may also be about 60 μm or less (for example, about 50 μm or less). In one aspect of the technique disclosed herein, the 23 ° C storage elastic modulus (G' of the adhesive layer constituting the first adhesive face _{twenty three} Relative to the thickness of the adhesive layer (T _A1 The ratio may be less than about 10 MPa/mm. With such a G' _{twenty three} /T _A1 Adhesive sheets of adhesive layer that do not reach a certain value have G' _{twenty three} /T _A1 Compared with the larger adhesive layer, it tends to exhibit a better initial adhesion to the adherend. For example, if you use G' ₁₀₀ It is about 0.08 MPa or more (typically about 0.08 MPa or more and less than about 0.50 MPa) and G' _{twenty three} /T _A1 When the adhesive layer is less than about 10 MPa/mm, the following adhesive sheet can be realized: even if the release film on the first adhesive surface is replaced with a lower smoothness, the smoothness of the first adhesive surface is less susceptible to The damage is good, and the initial adhesion to the adherend is good. In terms of getting better results, in one aspect, G' can be _{twenty three} /T _A1 It is set to be about 8.0 MPa/mm or less. The techniques disclosed herein can be, for example, G' _{twenty three} /T _A1 The aspect of about 6.0 MPa/mm or less (for example, about 5.0 MPa/mm or less) is preferably carried out. G' _{twenty three} /T _A1 The lower limit is not particularly limited, and is usually suitably set to be about 0.2 MPa/mm or more. In the case where the adhesive sheet disclosed herein is in the form of a double-sided adhesive sheet, the second adhesive surface may be the other surface of the adhesive layer constituting the first adhesive surface. Since the double-sided adhesive sheet (substrate-free double-sided adhesive sheet) of such a state has a simple structure, it is suitable for improvement of optical characteristics (for example, transparency). Further, the second adhesive surface may be a surface of the second adhesive layer which is an adhesive layer different from the adhesive layer constituting the first adhesive surface. The double-sided adhesive sheet of such a state is typically in the form of a double-sided adhesive sheet with a substrate, depending on the composition or composition of the first adhesive layer and the second adhesive layer, and the selection of the supporting substrate. A wide variety of performances can be achieved. Although not particularly limited, in one aspect, the second adhesive layer can satisfy various characteristics described above with respect to the first adhesive layer (for example, G' ₁₀₀ , G' _{twenty three} , G' ₁₀₀ /G' _{twenty three} , T _A1 , G' ₁₀₀ /T _A1 , G' _{twenty three} /T _A1 One or two or more types of haze values, and the like. <Adhesive> In the technique disclosed herein, the type of the adhesive constituting the adhesive layer is not particularly limited. For example, it may be selected from the group consisting of an acrylic adhesive, a rubber-based adhesive (natural rubber, synthetic rubber, and the like), a polyoxygen adhesive, a polyester adhesive, and a urethane. An adhesive layer comprising one or more adhesives of various known adhesives such as an adhesive, a polyether adhesive, a polyamide-based adhesive, and a fluorine-based adhesive. Here, the acrylic adhesive refers to an adhesive in which a (meth)acrylic polymer is used as a base polymer (a main component in a polymer component, that is, a component having a content of more than 50% by mass). Rubber adhesives and other adhesives have the same meaning. In view of transparency, weather resistance, etc., the content of the acrylic adhesive is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more. Adhesive layer. The content ratio of the acrylic adhesive may be more than 98% by weight, or may be an adhesive layer substantially composed of an acrylic adhesive. Here, in the present specification, "(meth)acrylic acid" means a meaning including acrylic acid and methacrylic acid. Similarly, "(meth)acrylonitrile" means the meaning of including an acryloyl group and a methacryloyl group, and "(meth)acrylate" means the meaning of including an acrylate and a methacrylate. In the present specification, the (meth)acrylic polymer refers to a polymer containing a (meth)acrylic monomer as a monomer component constituting the (meth)acrylic polymer. That is, it means a polymer containing a monomer unit derived from a (meth)acrylic monomer. Here, the (meth)acrylic monosystem refers to a monomer having at least one (meth)acrylonium group in one molecule. Although it is not particularly limited, in one aspect of the technology disclosed herein, the above-mentioned adhesive layer can be preferably produced by using an adhesive composition containing a monomer component constituting a (meth)acrylic polymer. Hereinafter, such an adhesive composition may be referred to as "(meth)acrylic adhesive composition". Here, the "monomer component constituting the (meth)acrylic polymer" means a monomer constituting the (meth)acrylic polymer among the adhesives obtained from the (meth)acrylic adhesive composition. ingredient. The monomer component may be contained in the (meth)acrylic adhesive composition as an unreacted monomer (that is, in the form of a raw material monomer which is not reacted with a polymerizable functional group), or may be in the form of a polymer (ie, It may be contained as a monomer unit, or may be contained in the form of both. <Monomer component> In one aspect of the technology disclosed herein, the adhesive layer may include the following component (A) as an adhesive composition constituting a monomer component of the (meth)acrylic polymer. form. In a preferred embodiment, the pressure-sensitive adhesive layer can be preferably formed by using the following (meth)acrylic pressure-sensitive adhesive composition, and the (meth)acrylic pressure-sensitive adhesive composition contains at least the following component (A). Further, one or both of the following components (B) and below (C) may be contained as a monomer component constituting the (meth)acrylic polymer, as needed. (Component (A)) The component (A) is an alkyl (meth)acrylate having an alkyl group having 2 to 18 carbon atoms at the ester terminal. Hereinafter, an alkyl (meth)acrylate having an alkyl group having a carbon number of X or more and Y or less at the ester terminal may be expressed as "(meth)acrylic acid C. _XY Alkyl ester". (meth)acrylic acid C _2-18 C in alkyl ester _2-18 The structure of the alkyl group is not particularly limited, and any of the above-mentioned alkyl groups may be used as a linear one or a branched one. As the component (A), such (meth)acrylic acid C can be used alone. _2-18 One type of the alkyl esters or two or more types may be used in combination. As a (meth)acrylic acid C having a linear alkyl group at the ester end _2-18 Examples of the alkyl esters include ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, n-amyl (meth)acrylate, and n-hexyl (meth)acrylate. N-heptyl (meth)acrylate, n-octyl (meth)acrylate, n-decyl (meth)acrylate, n-decyl (meth)acrylate, n-undecyl (meth)acrylate, (a) N-dodecyl acrylate, n-tridecyl (meth) acrylate, n-tetradecyl (meth) acrylate, n-pentadecyl (meth) acrylate, (methyl) N-hexadecyl acrylate, n-heptadecyl (meth) acrylate and n-octadecyl (meth) acrylate. Also, as (meth)acrylic acid C having a branched alkyl group at the ester terminal _3-18 The alkyl ester may, for example, be isopropyl (meth)acrylate, tert-butyl (meth)acrylate, isobutyl (meth)acrylate, isoamyl (meth)acrylate or (meth)acrylic acid. Triamyl ester, neopentyl (meth)acrylate, isohexyl (meth)acrylate, isoheptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate , isodecyl (meth)acrylate, isodecyl (meth)acrylate, 2-propylheptyl (meth)acrylate, isodecyl (meth)acrylate, iso-(meth)acrylate Dialkyl ester, isotridecyl (meth)acrylate, isomyristyl (meth)acrylate, isopentadecyl (meth)acrylate, isohexadecyl (meth)acrylate An ester, an isoheptadecyl (meth)acrylate, an isostearyl (meth)acrylate, or the like. The technique disclosed herein may comprise component (A) selected from the group consisting of acrylic acid C _4-9 One or two or more kinds of the alkyl esters are preferably carried out. As acrylic acid C _4-9 Preferable examples of the alkyl esters include n-butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, and isodecyl acrylate. (Component (B)) The component (B) is an alicyclic monomer. In the aspect in which the component (B) is used in combination with the component (A), it is preferable to achieve a balanced balance between the preferred storage elastic modulus disclosed herein and other adhesive properties (for example, Adhesive layer of the body. As the alicyclic monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a alicyclic structure-containing group can be used without particular limitation. As the component (B), one type of these alicyclic monomers may be used alone or two or more types may be used in combination. Here, the "base containing an alicyclic structure" means a portion containing at least one alicyclic structure. Further, the "alicyclic structure" means a saturated or unsaturated carbocyclic structure which does not have aromaticity. In the present specification, the group having an alicyclic structure may be simply referred to as an "alicyclic group". Preferable examples of the alicyclic group include a hydrocarbon group or a hydrocarbyloxy group having an alicyclic structure. As an example of the alicyclic monomer which is preferable in the technique disclosed herein, an alicyclic (meth) acrylate having an alicyclic group and a (meth) acrylonitrile group can be exemplified. Specific examples of the alicyclic (meth) acrylate include cyclopropyl (meth)acrylate, cyclobutyl (meth)acrylate, cyclopentyl (meth)acrylate, and (meth)acrylic acid ring. Hexyl ester, cycloheptyl (meth)acrylate, cyclooctyl (meth)acrylate, (meth)acrylic acid A base ester, a dicyclopentyl (meth)acrylate, etc., and HPMPA, TMA-2, HCPA, etc. shown by the following chemical formula. An alicyclic group in the alicyclic monomer (in the case of an alicyclic (meth) acrylate, a part obtained by removing a (meth) acryl oxime group from the alicyclic (meth) acrylate) The carbon number is not particularly limited. For example, an alicyclic monomer having an alicyclic group having 4 to 24 (preferably 5 to 18, more preferably 5 to 12) carbon atoms can be used. Among them, cyclohexyl acrylate (CHA), cyclohexyl methacrylate, and acrylic acid are preferred. Base ester (IBXA) and methacrylic acid The base ester is more preferably CHA and IBXA, and particularly preferably CHA. (Component (C)) The component (C) is a monomer having at least one of a hydroxyl group and a carboxyl group. As the hydroxyl group-containing monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a hydroxyl group can be used without particular limitation. The hydroxyl group-containing monomer may be used alone or in combination of two or more. Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 2-(meth)acrylate. Hydroxybutyl ester, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, (A) a hydroxyalkyl (meth) acrylate such as 12-hydroxylauryl ester such as 12-hydroxylauryl acrylate; or a hydroxyalkylcycloalkane (meth) acrylate such as (4-hydroxymethylcyclohexyl)methyl (meth)acrylate. Other examples include hydroxyethyl (meth) acrylamide, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like. . Among these, a hydroxyalkyl (meth)acrylate is preferred. For example, a hydroxyalkyl (meth)acrylate having a hydroxyalkyl group having 2 to 6 carbon atoms can be preferably used. In one preferred embodiment, it may be selected from the group consisting of 2-hydroxyethyl acrylate (2HEA), 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate (4HBA) and 4-hydroxybutyl methacrylate. One type or two or more types are used as the hydroxyl group-containing monomer. The hydroxyl-containing monomer used in the preferred embodiment of the technology disclosed herein can be a single 4HBA, 2HEA alone, or a combination of 4HBA and 2HEA. As the carboxyl group-containing monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a carboxyl group can be used without particular limitation. The carboxyl group-containing monomer may be used alone or in combination of two or more. Examples of the carboxyl group-containing monomer include ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, carboxyethyl (meth)acrylate, and carboxypentyl (meth)acrylate; itaconic acid, An ethylenically unsaturated dicarboxylic acid such as maleic acid, fumaric acid or citraconic acid; a metal salt (such as an alkali metal salt); an anhydride of the above ethylenically unsaturated dicarboxylic acid such as maleic anhydride or itaconic anhydride. Wait. Among these, acrylic acid, methacrylic acid, and acrylic acid is preferable. The technique disclosed herein can preferably be carried out in such a manner that the component (C) contains a hydroxyl group-containing monomer. That is, it is preferred that the component (C) contains only a hydroxyl group-containing monomer or a hydroxyl group-containing monomer and a carboxyl group-containing monomer. In the case where the component (C) contains a hydroxyl group-containing monomer and a carboxyl group-containing monomer, the ratio of the hydroxyl group-containing monomer to the entire component (C) is preferably more than about 50% by weight, more preferably about 80% by weight. The above (for example, about 90% by weight or more). It is preferable to increase the ratio of the hydroxyl group-containing monomer to the component (C), to lower the metal corrosion caused by the carboxyl group, and the like. The techniques disclosed herein can be preferably carried out in such a manner that the monomer component is substantially free of carboxyl-containing monomers. For example, the ratio of the carboxyl group-containing monomer to the monomer component can be set to be less than about 1% by weight, preferably less than about 0.5% by weight, and more preferably less than about 0.2% by weight. The ratio of the component (A) to the entire monomer component is not particularly limited. It is easy to get G' ₁₀₀ And G' ₁₀₀ /G' _{twenty three} The ratio of the component (A) is preferably about 90% by weight or less, preferably about 85% by weight or less, more preferably about 70% by weight, based on one or both of the adhesive layers having a preferred value. the following. In a preferred embodiment, the ratio of the component (A) may be set to about 60% by weight or less (further, about 50% by weight or less, for example, less than about 50% by weight). In addition, the ratio of the component (A) is preferably about 30% by weight or more, and more preferably about 35% by weight or more, from the viewpoint of the initial adhesion property of the adherend. In one aspect, the ratio of the component (A) to the entire monomer component can be, for example, about 30 to 70% by weight. In the case where the component (B) is contained as the monomer component, the ratio of the component (B) to the entire monomer component is not particularly limited. It is easy to get G' ₁₀₀ And G' ₁₀₀ /G' _{twenty three} The ratio of the component (B) is preferably about 3% by weight or more, preferably about 5% by weight or more, more preferably about 8 by weight, based on one or both of the preferred adhesive layers. % or more (for example, about 10% by weight or more). In addition, the ratio of the component (B) is preferably about 65% by weight or less, preferably about 60% by weight or less, more preferably about 55% by weight or less, from the viewpoint of the initial adhesion property of the adherend. It is about 50% by weight or less, for example, less than about 50% by weight. In a preferred embodiment, the ratio of the component (B) to the entire monomer component may be about 15% by weight or more, and may be about 20% by weight or more, or about 25% by weight or more. Further, it is about 30% by weight or more (for example, about 35% by weight or more). In one aspect, the ratio of the component (B) to the entire monomer component can be, for example, about 20 to 50% by weight. When the component (C) is contained as the monomer component, the ratio of the component (C) to the entire monomer component is not particularly limited. The ratio of the component (C) is typically about 3% by weight or more, preferably about 5% by weight or more, more preferably about 8% by weight or more, from the viewpoint of the initial adhesion of the adherend or the like (for example, About 10% by weight or more). Also, it is easy to get G' ₁₀₀ And G' ₁₀₀ /G' _{twenty three} The ratio of the component (C) is preferably about 35 wt% or less, more preferably about 30 wt% or less, still more preferably about 25, in terms of one or both of the adhesive layers having a preferred value. Below weight%. In one aspect, the ratio of the component (C) may be, for example, about 15 to 30% by weight. (Optional monomer) The monomer component in the technology disclosed herein may also contain a monomer other than the above-mentioned (A) component, (B) component, and (C) component (hereinafter also referred to as "arbitrary monomer"). . Examples of such an optional monomer include a heterocyclic monomer containing a cyclic nitrogen monomer or a cyclic ether group-containing monomer. Such a heterocyclic-containing monomer can contribute to achieving an adhesive layer which balances the preferred storage elastic modulus and other adhesive properties or other characteristics disclosed herein in a balanced manner as in the above component (B). Moreover, it can also contribute to an increase in the adhesion or cohesive force of the adhesive. The heterocyclic monomer may be used alone or in combination of two or more. As the cyclic nitrogen-containing monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a cyclic nitrogen structure can be used without particular limitation. The cyclic nitrogen structure is preferably one having a nitrogen atom in the cyclic structure. Examples of the cyclic nitrogen-containing monomer include an intrinsic amine-based vinyl monomer such as N-vinylpyrrolidone, N-vinyl-ε-caprolactam, and methylvinylpyrrolidone; -vinyl-2- Oxazoline, 2-vinyl-5-methyl-2- Oxazoline, 2-isopropenyl-2- Oxazoline Oxazoline group monomer; vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl pipe Vinylpyr , vinyl pyrrole, vinyl imidazole, vinyl A vinyl monomer having a nitrogen-containing hetero ring or the like. Other examples of the cyclic nitrogen-containing monomer include a Chloride ring, piperidine ring, pyrrolidine ring, piperazine A (meth)acrylic monomer containing a nitrogen-containing heterocyclic ring such as a ring or an aziridine ring. Specifically, it can be mentioned that N-acrylonitrile Porphyrin, N-propylene hydrazinopiperidine, N-methylpropenylpiperidine, N-propenylpyridylpyridine, N-propenyl aziridine, and the like. Among the above-mentioned cyclic nitrogen-containing monomers, from the viewpoint of cohesiveness and the like, a decylamine-based vinyl monomer is preferred, and N-vinylpyrrolidone is more preferred. As the monomer having a cyclic ether group, a polymerizable functional group having an unsaturated double bond such as a (meth)acryl fluorenyl group or a vinyl group and having an epoxy group or an oxetane group can be used without particular limitation. Such as a cyclic ether base. Examples of the epoxy group-containing monomer include glycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. Ether, etc. Examples of the oxetane group-containing monomer include 3-oxetanylmethyl (meth)acrylate, 3-methyl-oxetanylmethyl (meth)acrylate, and (meth)acrylic acid. 3-ethyl-oxetanylmethyl ester, 3-butyl-oxetanylmethyl (meth)acrylate, 3-hexyl-oxetanylmethyl (meth)acrylate, and the like. Other examples of the above-mentioned arbitrary monomer include an alkyl (meth)acrylate which does not belong to the component (A), that is, an alkyl group having a carbon number of 1 or 19 or more (for example, 19 to 24) (methyl). Alkyl acrylate. Specific examples of such an alkyl (meth)acrylate include methyl (meth)acrylate, n-nonadecyl (meth)acrylate, and isodecyl (meth)acrylate. N-icosyl (meth)acrylate, isodecyl (meth)acrylate, and the like. These may be used alone or in combination of two or more. Other examples of the above-mentioned arbitrary monomer include monomers containing a functional group other than a hydroxyl group and a carboxyl group. Such a functional group-containing monomer can be used for the purpose of introducing a crosslinking point into a (meth)acrylic polymer or increasing the cohesive force of the (meth)acrylic polymer. Examples of the functional group-containing monomer include decylamine such as (meth) acrylamide, N,N-dimethyl(meth) acrylamide, and N-hydroxymethyl (meth) acrylamide. a monomer; for example, a cyano group-containing monomer such as acrylonitrile or methacrylonitrile; for example, styrenesulfonic acid, allylsulfonic acid, 2-(methyl)acrylamido-2-methylpropanesulfonic acid a sulfonic acid group-containing monomer; for example, a phosphate group-containing monomer such as 2-hydroxyethyl acrylate; for example, diacetone (meth) acrylamide, diacetone (meth) acrylate, vinyl a ketone group-containing monomer such as a ketone or an ethylene vinyl acetate; an isocyanate group-containing monomer such as 2-(meth) propylene methoxyethyl isocyanate; for example, methoxyethyl (meth)acrylate An alkoxy-containing monomer such as an ester or an ethoxyethyl (meth)acrylate; for example, 3-(meth)acryloxypropyltrimethoxydecane, 3-(meth)acryloxypropane Alkoxyalkylene group-containing monomers such as triethoxysilane. These may be used alone or in combination of two or more. In the monomer component of the technique disclosed herein, for the purpose of adjusting the Tg of the (meth)acrylic polymer or improving the cohesive force, the above-mentioned optional monomer may include the above (A) and (B). The copolymerizable monomer other than the above-exemplified copolymerized by the component (C). Examples of such a copolymerizable monomer include vinyl carboxylates such as vinyl acetate and vinyl propionate; and aromatic vinyl such as styrene, substituted styrene (α-methylstyrene), and vinyl toluene. a base compound; for example, an aryl (meth)acrylate (for example, phenyl (meth)acrylate), an aryloxyalkyl (meth)acrylate (for example, phenoxyethyl (meth)acrylate), (methyl) An aromatic ring-containing (meth) acrylate such as an arylalkyl acrylate (for example, benzyl (meth) acrylate); for example, an olefin series such as ethylene, propylene, isoprene, butadiene or isobutylene a chlorine-containing monomer such as vinyl chloride or vinylidene chloride; a vinyl ether monomer such as methyl vinyl ether or ethyl vinyl ether; and a monomer terminal having a polymerization of a vinyl group. A macromonomer of a base polymerizable vinyl group or the like. These may be used alone or in combination of two or more. The amount of the optional monomers used is not particularly limited and can be appropriately determined. In general, the total amount of the monomers used is preferably less than about 50% by weight of the monomer component, preferably about 30% by weight or less, and more preferably about 20% by weight or less. The technique disclosed herein can be preferably carried out in such a manner that the total amount of the monomers used is about 10% by weight or less (e.g., about 5% by weight or less) of the monomer component. In the case of using any of the monomers, the amount of the optional monomer used is preferably about 0.5% by weight or more based on the monomer component, from the viewpoint of appropriately improving the effect of the adhesion or the cohesive force. It is about 0.8% by weight or more. Moreover, the techniques disclosed herein may also be substantially free of any monomeric form (for example, the amount of any monomer used is about 0.3% by weight or less, typically about 0.1% by weight or less, of the monomer component. The sample is preferably implemented. The above components (A), (B), (C) and any monomer are typically monofunctional monomers. In addition to such a monofunctional monomer, the monomer component may contain an appropriate amount of a polyfunctional monomer as needed for the purpose of adjusting the storage elastic modulus of the adhesive layer. Here, in the present specification, a monofunctional single system means a polymerizable functional group (typically a radical polymerizable functional group) having an unsaturated double bond such as only one (meth)acryl fluorenyl group or a vinyl group. Monomer. In contrast, a polyfunctional monomer refers to a monomer having at least two such polymerizable functional groups as described below. (Polyfunctional monomer) The polyfunctional single system has a single polymerizable functional group (typically a radical polymerizable functional group) having an unsaturated double bond such as at least two (meth)acryl fluorenyl groups or a vinyl group. body. Examples of the polyfunctional monomer include ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, and polypropylene glycol di(methyl). Acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,2-ethanediol Di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,12-dodecanediol di(a) Alkenyl ester, trimethylolpropane tri(meth)acrylate, tetramethylol methane tri(meth)acrylate, and other esters of (meth)acrylic acid; allyl (meth)acrylate , (meth)acrylic acid vinyl ester, divinyl benzene, epoxy acrylate, polyester acrylate, urethane acrylate, and the like. Preferred examples of the above include trimethylolpropane tri(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and dipentaerythritol hexa(meth)acrylate. Among them, preferred examples thereof include 1,6-hexanediol di(meth)acrylate. The polyfunctional monomer may be used alone or in combination of two or more. From the viewpoint of reactivity and the like, a polyfunctional monomer having two or more acrylonitrile groups is usually preferable. The amount of the polyfunctional monomer to be used is not particularly limited, and can be appropriately set so as to achieve the purpose of use of the polyfunctional monomer. In terms of a balanced balance between the preferred storage elastic modulus disclosed herein and other adhesive properties or other characteristics, in one aspect, the amount of the polyfunctional monomer used may be set to about 3 weights of the above monomer components. % or less is preferably about 2% by weight or less, more preferably about 1% by weight or less (for example, about 0.5% by weight or less). When the polyfunctional monomer is used, the lower limit of the amount used is more than 0% by weight, and is not particularly limited. Usually, the use amount of the polyfunctional monomer is appropriately set to about 0.001% by weight or more (for example, about 0.01% by weight or more) of the monomer component. The ratio of the total amount of the component (A), the component (B), and the component (C) to the entire monomer component is typically more than about 50% by weight, preferably about 70. The weight% or more is more preferably about 80% by weight or more, and still more preferably about 90% by weight or more. The technique disclosed herein can be preferably carried out in such a manner that the ratio of the above-mentioned total amount is about 95% by weight or more (for example, about 99% by weight or more). The ratio of the above total amount may also be 100% by weight. The technique disclosed herein can be preferably carried out in such a manner that the ratio of the total amount of the monomer components as a whole is 99.999 wt% or less (for example, 99.99 wt% or less). The Tg of the copolymer corresponding to the composition of the above monomer component is preferably about -20 ° C or less, and more preferably about - from the viewpoint of adhesion of the adhesive sheet or low-temperature characteristics. Below 25 °C. Also, it is easy to get G' ₁₀₀ And G' ₁₀₀ /G' _{twenty three} The Tg of the above copolymer is preferably about -55 ° C or higher, preferably about -50 ° C or higher, more preferably about -45 ° C or higher, in one or both of the preferred adhesive layers. The technique disclosed herein can also preferably be carried out in such a manner that the Tg of the above copolymer is about -40 ° C or higher (e.g., about -35 ° C or higher). Here, the Tg of the copolymer corresponding to the composition of the monomer component means a Tg determined from the Fox formula based on the composition of the above monomer component. The Fox formula is as follows: the relationship between the Tg of the copolymer and the glass transition temperature Tgi of the homopolymer which is homopolymerized separately from the monomers constituting the copolymer. 1/Tg=Σ(Wi/Tgi) Further, in the above Fox formula, Tg represents the glass transition temperature (unit: K) of the copolymer, and Wi represents the weight fraction of the monomer i in the copolymer (weight basis The copolymerization ratio), Tgi represents the glass transition temperature (unit: K) of the homopolymer of monomer i. However, in the present specification, the calculation of Tg is carried out only in consideration of a monofunctional monomer. Therefore, when the monomer component contains a polyfunctional monomer, the total amount of the monofunctional monomers contained in the monomer component is 100% by weight, based on the Tg of the homopolymer of each monofunctional monomer, and The Tg is calculated from the weight fraction of the above-mentioned total amount of the monofunctional monomer. As the glass transition temperature of the homopolymer used in the calculation of Tg, the values described in the publicly known materials are used. For example, regarding the monomers listed below, the glass transition temperature of the homopolymer of the monomer uses the following values. N-butyl acrylate -55 ° C 2-ethylhexyl acrylate -70 ° C cyclohexyl acrylate 15 ° C acrylic acid Base ester 94°C 2-hydroxyethyl acrylate-15°C 4-hydroxybutyl acrylate-40°C Acrylic acid 106°C Methacrylic acid 228°C For the glass transition temperature of the homopolymer of the monomer other than the above, use “Polymer Handbook” (Valued in 3rd edition, John Wiley & Sons, Inc, 1989). The highest value is used for the monomers in which various values are described in this document. The monomer which does not describe the glass transition temperature of the homopolymer in the above-mentioned "Polymer Handbook" is a value obtained by the following measurement method (refer to Japanese Patent Laid-Open Publication No. 2007-51271). Specifically, 100 parts by weight of a monomer, 0.2 parts by weight of azobisisobutyronitrile, and 200 parts by weight of ethyl acetate as a polymerization solvent are charged into a reactor equipped with a thermometer, a stirrer, a nitrogen gas introduction tube, and a reflux cooling tube. The mixture was stirred for 1 hour while flowing nitrogen gas. After removing oxygen in the polymerization system in this manner, the temperature was raised to 63 ° C and allowed to react for 10 hours. Then, it was cooled to room temperature, and a homopolymer solution having a solid content concentration of 33% by weight was obtained. This homopolymer solution was cast-coated on a release film, and dried to prepare a test sample (sheet-like homopolymer) having a thickness of about 2 mm. The test sample was punched out into a disk shape of 7.9 mm in diameter, sandwiched by a parallel plate, and a shear strain of 1 Hz was applied to one side using a viscoelasticity tester (ARES manufactured by TA Instruments, Inc.) on one side at -70 The viscoelasticity was measured by a shear mode at a temperature elevation rate of 5 ° C /min in a temperature range of -150 ° C, and the peak top temperature of tan δ (loss tangent) was set as the glass transition temperature. <Adhesive Composition> The adhesive layer disclosed herein may be a one comprising a composition as described above in the form of a polymer, an unpolymer (i.e., a form in which the polymerizable functional group is unreacted) or a mixture thereof. It is formed by an adhesive composition of a body component. The above-mentioned adhesive composition may be in the form of a composition containing a binder (adhesive component) in an organic solvent (solvent-type adhesive composition); a composition in which the adhesive is dispersed in an aqueous solvent (water) a dispersion-type adhesive composition); a composition prepared by curing with an active energy ray such as ultraviolet rays or radiation to form an adhesive (active energy ray-curable adhesive composition); coating in a heated and molten state A hot-melt adhesive composition or the like which forms an adhesive when cooled to around room temperature. Here, in the present specification, the "active energy ray" means an energy ray having energy capable of causing a chemical reaction such as a polymerization reaction, a crosslinking reaction, or decomposition of a starter. Examples of the active energy rays herein include light such as ultraviolet rays, visible rays, and infrared rays; or radiation such as α rays, β rays, γ rays, electron beams, neutron beams, and X rays. The above adhesive composition typically comprises at least a part of the monomer component of the composition in the form of a polymer (which may be part of the monomer type or a part of the component). The polymerization method in the case of forming the above polymer is not particularly limited, and various conventionally known polymerization methods can be suitably employed. For example, thermal polymerization such as solution polymerization, emulsion polymerization, or bulk polymerization (typically, in the presence of a thermal polymerization initiator); photopolymerization by irradiation of light such as ultraviolet rays (typically, light) can be suitably employed. Radiation polymerization by irradiation with radiation such as β-rays or γ-rays is carried out in the presence of a polymerization initiator. Among them, photopolymerization is preferred. In the polymerization method, the polymerization state is not particularly limited, and a conventionally known monomer supply method, polymerization conditions (temperature, time, pressure, light irradiation amount, radiation irradiation amount, etc.) and use other than the monomer can be appropriately selected. The material (polymerization initiator, surfactant, etc.) or the like is carried out. In the polymerization, a known or customary photopolymerization initiator or a thermal polymerization initiator may be used depending on the polymerization method, the polymerization state, and the like. These polymerization initiators may be used alone or in combination of two or more. The photopolymerization initiator is not particularly limited, and for example, a ketal photopolymerization initiator, an acetophenone photopolymerization initiator, a benzoin ether photopolymerization initiator, a mercaptophosphine oxide photopolymerization can be used. Starting agent, α-keto alcohol photopolymerization initiator, aromatic sulfonium chloride photopolymerization initiator, photoactive oxime photopolymerization initiator, benzoin photopolymerization initiator, benzoin photoluminescence Polymerization initiator, benzophenone photopolymerization initiator, 9-oxosulfur A photopolymerization initiator or the like. Specific examples of the ketal-based photopolymerization initiator include 2,2-dimethoxy-1,2-diphenylethane-1-one (for example, trade name "Irgacure 651" manufactured by BASF Corporation). Specific examples of the acetophenone-based photopolymerization initiator include 1-hydroxycyclohexyl-phenyl-ketone (for example, trade name "Irgacure 184" manufactured by BASF Corporation), 4-phenoxydichloroacetophenone, and 4 -T-butyl-dichloroacetophenone, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one (for example, BASF The product name "Irgacure 2959" manufactured by the company, 2-hydroxy-2-methyl-1-phenyl-propan-1-one (for example, the trade name "Darocure 1173" manufactured by BASF Corporation), methoxybenzene B Ketones, etc. Specific examples of the benzoin ether photopolymerization initiator include benzoin ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and the like, and substituted benzoin such as anisole methyl ether. ether. Specific examples of the fluorenylphosphine oxide-based photopolymerization initiator include bis(2,4,6-trimethylbenzylidene)phenylphosphine oxide (for example, trade name "Irgacure 819" manufactured by BASF Corporation), double (2,4,6-trimethylbenzylidene)-2,4-di-n-butoxyphenylphosphine oxide, 2,4,6-trimethylbenzimidyldiphenylphosphine oxide (for example The product name "Lucirin TPO" manufactured by BASF Corporation, bis(2,6-dimethoxybenzylidene)-2,4,4-trimethylpentylphosphine oxide, and the like. Specific examples of the α-keto alcohol-based photopolymerization initiator include 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one. Wait. Specific examples of the aromatic sulfonium chloride-based photopolymerization initiator include 2-naphthalenesulfonium chloride and the like. Specific examples of the photoactive oxime-based photopolymerization initiator include 1-phenyl-1,1-propanedione-2-(O-ethoxycarbonyl)anthracene and the like. Specific examples of the benzoin-based photopolymerization initiator include benzoin and the like. Specific examples of the benzoin-based photopolymerization initiator include benzoin and the like. Specific examples of the benzophenone-based photopolymerization initiator include benzophenone, benzamidine benzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyvinyl benzophenone. Ketone, α-hydroxycyclohexyl phenyl ketone, and the like. 9-oxygen sulfur Specific examples of the photopolymerization initiator include 9-oxosulfur 2-chloro-9-oxosulfur 2-methyl-9-oxosulfur 2,4-dimethyl-9-oxosulfur Isopropyl-9-oxosulfur 2,4-dichloro-9-oxosulfur 2,4-diethyl-9-oxosulfur Isopropyl-9-oxosulfur 2,4-diisopropyl-9-oxosulfur Dodecyl-9-oxosulfur Wait. The thermal polymerization initiator is not particularly limited, and for example, an azo-based polymerization initiator, a peroxide-based initiator, a redox-based initiator formed by a combination of a peroxide and a reducing agent, and a A substituted ethane-based initiator or the like. More specifically, for example, 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylpropionamidine) disulfate, 2,2'-azobis ( 2-mercaptopropane) dihydrochloride, 2,2'-azobis[2-(5-methyl-2-imidazolin-2-yl)propane] dihydrochloride, 2,2'-couple Azo system such as nitrogen bis(N,N'-dimethylene isobutyl fluorene) or 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine hydrate Starting agent; for example, persulfate such as potassium persulfate or ammonium persulfate; peroxide initiator such as benzamidine peroxide, tert-butyl hydroperoxide or hydrogen peroxide; for example, substituted by phenyl An ethane-based initiator which is substituted with an alkane or the like; for example, a redox-based initiator such as a combination of a persulfate and sodium hydrogen sulfite, or a combination of a peroxide and sodium ascorbate, but is not limited thereto. Further, the thermal polymerization can be preferably carried out at a temperature of, for example, about 20 to 100 ° C (typically 40 to 80 ° C). The amount of the thermal polymerization initiator or the photopolymerization initiator to be used is not particularly limited as long as it is used in accordance with a polymerization method, a polymerization state, or the like. For example, about 0.001 to 5 parts by weight (typically about 0.01 to 2 parts by weight, for example, about 0.01 to 1 part by weight) of the polymerization initiator can be used with respect to 100 parts by weight of the monomer to be polymerized. (Polymer composition comprising a monomer component and an unpolymerized adhesive composition) Preferably, the adhesive composition comprises a polymerization reactant of a monomer mixture, the monomer mixture comprising at least a part of the monomer of the composition Ingredients (raw material monomers). Typically, one of the above monomer components is contained in the form of a polymer, and the remainder is contained in the form of an unpolymer (unreacted monomer). The polymerization reactant of the above monomer mixture can be prepared by at least partially polymerizing the monomer mixture. The above polymerization reactant is preferably a partial polymer of the above monomer mixture. Such a partial polymer is a mixture of a polymer derived from the above monomer mixture and an unreacted monomer, and is typically in the form of a slurry (viscous liquid). Hereinafter, a part of the polymer of the above properties may be referred to as a "monomer slurry" or simply as a "slurry". The polymerization method in the case of obtaining the above-mentioned polymerization reactant is not particularly limited, and various polymerization methods as described above can be appropriately selected and used. From the viewpoint of efficiency or simplicity, a photopolymerization method can be preferably employed. When photopolymerization is used, the polymerization conversion ratio of the above monomer mixture can be easily controlled by polymerization conditions such as the amount of light irradiation (light amount). The polymerization conversion ratio (monomer conversion) of the monomer mixture in the above partial polymer is not particularly limited. The polymerization conversion ratio can be, for example, about 70% by weight or less, preferably about 60% by weight or less. The polymerization conversion ratio is usually about 50% by weight or less, preferably about 40% by weight or less (for example, about 35 parts by weight) from the viewpoints of easiness of preparation or coating property of the adhesive composition containing the above partial polymer. %the following). The lower limit of the polymerization conversion ratio is not particularly limited, and is typically about 1% by weight or more, and usually about 5% by weight or more. The adhesive composition containing a part of the polymer of the above monomer mixture can be easily obtained, for example, by partially polymerizing a monomer mixture containing all the raw material monomers by a suitable polymerization method (for example, photopolymerization). Other components (for example, a photopolymerization initiator, a polyfunctional monomer, a crosslinking agent, an acrylic oligomer described later, etc.) which can be used as desired in the adhesive composition containing the above partial polymer can be used. The method of blending such other components is not particularly limited. For example, it may be contained in the above monomer mixture in advance, or may be added to the above partial polymer. Further, the adhesive composition disclosed herein may also be a complete polymer in which a monomer mixture of a monomer including a monomer type of a monomer component (raw material monomer) is dissolved in a monomer of a remaining kind or a partial polymer thereof. The form. The adhesive composition of this form is also included in the example of a polymer comprising a monomer component and an adhesive composition of an unpolymer. In the present specification, "completely polymer" means a polymerization conversion ratio of more than 95% by weight. As a curing method (polymerization method) in which an adhesive is formed from a polymer containing a monomer component and an adhesive composition of an unpolymer, a photopolymerization method can be preferably employed. As the adhesive composition containing the polymerization reactant prepared by the photopolymerization method, it is particularly preferred to employ a photopolymerization method as the curing method. Since the polymerization reaction product obtained by the photopolymerization method already contains a photopolymerization initiator, when the adhesive composition containing the polymerization reactant is further cured to form an adhesive, even if a new photopolymerization initiator is not added, Perform photohardening. Alternatively, it may be an adhesive composition having a composition obtained by adding a photopolymerization initiator as needed in a polymerization reaction product prepared by a photopolymerization method. The additional photopolymerization initiator may be the same as or different from the photopolymerization initiator used to prepare the polymerization reactant. The adhesive composition prepared by a method other than photopolymerization can be photocurable by adding a photopolymerization initiator. The photocurable adhesive composition has an advantage that even a thick adhesive layer can be easily formed. In one preferred embodiment, photopolymerization when the adhesive is formed from the adhesive composition can be carried out by ultraviolet irradiation. As the ultraviolet irradiation, a known high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp or the like can be used. (Adhesive composition comprising a monomer component in the form of a completely polymer) It is preferred that the adhesive composition of another aspect comprises the monomer component of the agent composition in the form of a complete polymer. Such an adhesive composition may be, for example, a solvent-based adhesive composition containing a (meth)acrylic polymer as a complete polymer as a monomer component in an organic solvent, and the above (meth)acrylic polymer is dispersed in A form of a water-dispersible adhesive composition obtained in an aqueous solvent. (Crosslinking Agent) The adhesive composition disclosed herein may contain a crosslinking agent. As the crosslinking agent, a crosslinking agent known or customary in the field of an adhesive can be used. For example, an epoxy type crosslinking agent, an isocyanate type crosslinking agent, a polyoxyl type crosslinking agent, etc. are mentioned. An oxazoline crosslinking agent, an aziridine crosslinking agent, a decane crosslinking agent, an alkyl etherified melamine crosslinking agent, a metal chelate crosslinking agent, and the like. These may be used alone or in combination of two or more. The content of the crosslinking agent (the total amount of the crosslinking agent in the case where two or more kinds of crosslinking agents are contained) is not particularly limited. The content of the crosslinking agent is usually suitably set to about 5 by weight with respect to 100 parts by weight of the monomer component contained in the adhesive composition, from the viewpoint of achieving an adhesive having excellent adhesion properties such as adhesion or cohesive force. The amount is preferably 0.001 to 5 parts by weight, more preferably 0.001 to 4 parts by weight, still more preferably 0.001 to 3 parts by weight. Alternatively, it may be an adhesive composition which does not contain a crosslinking agent as described above. ((Meth)Acrylic oligomer) The (meth)acrylic oligomer may be contained in the adhesive composition disclosed herein from the viewpoint of improving adhesion and the like. As the (meth)acrylic oligomer, it is preferred to use a Tg of a copolymer having a Tg ratio corresponding to the composition of the above monomer component (typically, roughly corresponding to an adhesive formed of an adhesive composition) A polymer having a high Tg) of the (meth)acrylic polymer. By containing a (meth)acrylic oligomer, the adhesion of the adhesive can be improved. The (meth)acrylic oligomer preferably has a Tg of about 0 ° C or more and about 300 ° C or less, preferably about 20 ° C or more and about 300 ° C or less, more preferably about 40 ° C or more and about 300 ° C. the following. By setting the Tg within the above range, the adhesion can be preferably improved. Further, the Tg of the (meth)acrylic oligomer and the Tg of the copolymer corresponding to the composition of the above monomer component are the values calculated based on the Fox formula. The weight average molecular weight (Mw) of the (meth)acrylic oligomer may typically be about 1000 or more and less than about 30,000, preferably about 1,500 or more and less than about 20,000, and more preferably about 2,000 or more. Not up to about 10,000. It is preferred to obtain a good adhesion or retention property by setting Mw within the above range. The Mw of the (meth)acrylic oligomer can be determined by gel permeation chromatography (GPC) and determined as a value in terms of standard polystyrene. Specifically, in the HPLC8020 manufactured by Tosoh Corporation, TSK gel GMH-H (20) × 2 was used as a column, and the measurement was carried out using a tetrahydrofuran solvent at a flow rate of about 0.5 ml/min. Examples of the monomer constituting the (meth)acrylic oligomer include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and isopropyl (meth)acrylate. Ester, butyl (meth)acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, (methyl) ) isoamyl acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate , (meth) methacrylate, isodecyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, (methyl) (meth)acrylic acid alkyl ester such as lauryl acrylate; cyclohexyl (meth) acrylate, (meth) acrylate An ester of (meth)acrylic acid and an alicyclic alcohol such as a diester of (meth)acrylic acid; a (meth) acrylate or a benzyl (meth)acrylate; An aryl acrylate; a (meth) acrylate obtained from a terpene compound derivative alcohol. These (meth) acrylates may be used alone or in combination of two or more. The (meth)acrylic oligomer preferably contains isobutyl (meth)acrylate or tributyl (meth)acrylate from the viewpoint of further improving the adhesion of the adhesive layer. An alkyl (meth) acrylate having a branched structure; a cyclohexyl (meth) acrylate or a (meth) acrylate Ester of (meth)acrylic acid and alicyclic alcohol such as diesteryl (meth)acrylate; phenyl (meth)acrylate or benzyl (meth)acrylate (methyl) An acrylic monomer having a structure having a relatively large volume represented by a (meth) acrylate having a cyclic structure such as an aryl acrylate is used as a monomer unit. Further, in the case of synthesizing a (meth)acrylic oligomer or when ultraviolet rays are used in the production of an adhesive layer, it is preferred that the polymer has a saturated bond, and the alkyl group may have a branch. The alkyl (meth)acrylate of the chain structure or the ester with an alicyclic alcohol is preferably used as a monomer constituting the (meth)acrylic oligomer. From such a viewpoint, examples of preferred (meth)acrylic oligomers include dicyclopentanyl methacrylate (DCPMA), cyclohexyl methacrylate (CHMA), and methacrylic acid. Base ester (IBXMA), acrylic acid Homoesters (IBXA), dicyclopentanyl acrylate (DCPA), 1-adamantyl methacrylate (ADMA), 1-adamantyl acrylate (ADA), and CHMA and methacrylic acid Copolymer of isobutyl ester (IBMA), copolymer of CHMA and IBXMA, CHMA and acrylonitrile Copolymer of porphyrin (ACMO), copolymer of CHMA and diethyl acrylamide (DEAA), copolymer of ADA and methyl methacrylate (MMA), copolymer of DCPMA and IBXMA, copolymer of DCPMA and MMA Wait. When the (meth)acrylic oligomer is contained in the adhesive composition disclosed herein, the content thereof is not particularly limited. The content of the (meth)acrylic oligomer is generally relative to the monomer component 100 contained in the adhesive composition from the viewpoint of easily achieving the adhesive layer having a preferred storage elastic modulus disclosed herein. The parts by weight are preferably about 20 parts by weight or less, more preferably about 15 parts by weight or less, still more preferably about 10 parts by weight or less. The technique disclosed herein can also be preferably carried out without using a (meth)acrylic oligomer. Furthermore, the adhesive compositions disclosed herein may optionally contain various additives well known in the art of adhesives. For example, a coloring agent such as a dye or a pigment, an antistatic agent, a surfactant, a plasticizer, an adhesion-imparting resin, a surface lubricant, a leveling agent, a softener, an antioxidant, an anti-aging agent, and a light stabilizer may be appropriately added depending on the use. , UV absorbers, polymerization inhibitors, inorganic fillers or organic fillers, metal powders, particulates, foils, and the like. In the technique disclosed herein, as the adhesive composition for forming the adhesive layer, an active energy ray-curable adhesive composition (typically, a photocurable adhesive composition) can be preferably used. The active energy ray-curable pressure-sensitive adhesive composition is preferably one which does not substantially contain an organic solvent from the viewpoint of environmental hygiene and the like. For example, an adhesive composition having an organic solvent content of about 5% by weight or less (more preferably about 3% by weight or less, for example, about 0.5% by weight or less) is preferred. Further, as described below, since it is suitable for forming an adhesive layer in a form in which the liquid film of the adhesive composition is cured between the release faces of the pair of release films, it is preferable to substantially contain no solvent (including an organic solvent and water). Adhesive composition of the meaning of the solvent). For example, an adhesive composition having a solvent content of about 5% by weight or less (more preferably about 3% by weight or less, for example, about 0.5% by weight or less) is preferred. Further, the solvent herein refers to a volatile component which should be removed during the formation of the adhesive layer, that is, a volatile component which is not intended to be a constituent component of the finally formed adhesive layer. <Method for Producing Adhesive Sheet> The method for producing the adhesive sheet disclosed herein is not particularly limited. For example, by applying any of the adhesive compositions disclosed herein to the release surface of the release film and drying or hardening it to form an adhesive layer, a substrate-free double layer comprising the adhesive layer can be obtained. Adhesive sheet. Further, by bonding (transferring) the adhesive layer thus formed on the release film to the non-peeling surface of the support substrate, a single-sided adhesive sheet with a substrate can be obtained. As another method of producing a single-sided adhesive sheet with a substrate, a method of directly applying an adhesive composition to a non-peeling surface of a support substrate and drying or hardening it may be mentioned. The double-sided adhesive sheet with a substrate can be obtained by transferring the adhesive layer formed on the release film to the support substrate, or directly applying the adhesive composition to the support substrate and drying or hardening the adhesive composition. The method is produced by combining the methods or the like. As the coating method of the adhesive composition, various previously known methods can be used. Specific examples thereof include roll coating, contact roll coating, gravure coating, reverse coating, roll coating, spray coating, dip roller coating, bar coating, and knife coating. Cloth, air knife coating, curtain coating, lip coating, extrusion coating method using a die coater or the like. The adhesive sheet disclosed herein can be preferably produced by a method comprising drying or hardening a liquid film of the adhesive composition on a peeling surface of the release film to form a hardened surface on the peeling surface. Adhesive layer on the first adhesive side. According to this method, the adhesive composition (liquid film) having a fluidity state can be brought into contact with the peeling surface and dried or hardened, whereby the surface of the adhesive layer formed by contact with the peeling surface can be controlled with high precision. Smoothness. For example, a first adhesive surface having desired smoothness can be produced stably (reproducibly) by using a release film having a release surface having appropriate smoothness. The adhesive sheet disclosed herein can be preferably produced by a method in which a liquid film of the above adhesive composition is cured between the release faces of a pair of release films to form an adhesive layer. The method is preferably a method for producing a substrateless double-sided adhesive sheet in which the ten-point average roughness of the first adhesive face and the ten-point average roughness of the second adhesive face are within the preferred range disclosed herein. Moreover, by bonding the thus obtained substrate-free double-sided adhesive sheet to the non-peeling surface of the support substrate, it can also be preferably used for manufacturing a single-sided adhesive sheet with a substrate or a substrate. Double-sided adhesive sheet. As a method of disposing the liquid film of the adhesive composition between the release faces of the pair of release films, a liquid adhesive composition may be applied to the release surface of the first release film, and then the adhesive film may be applied thereto. The liquid film of the agent composition is covered with a second release film. As another method, a method in which a first release film and a second release film are supplied between a pair of rolls in a direction in which a peeling surface is opposed to each other, and a liquid adhesive composition is supplied between the separated surfaces is exemplified. Further, the application of the adhesive composition is preferably carried out at 80 ° C or lower, more preferably at 60 ° C or lower (for example, 40 ° C or lower). Thereby, it is possible to suppress the roughness of the adhesive layer due to the difference in thermal expansion coefficient between the release film and the adhesive layer, and to form an adhesive surface having higher smoothness. The gel fraction of the adhesive layer disclosed herein is not particularly limited, but is usually preferably about 99.5% by weight or less, more preferably about 20 to 99.5% by weight, still more preferably about 50 to 99.5% by weight. In the case where the above-mentioned adhesive composition contains a crosslinking agent, the addition amount of the crosslinking agent can be adjusted, and the gel fraction can be controlled in consideration of the influence of the crosslinking treatment temperature or the crosslinking treatment time. Although it is not particularly limited, the adhesive layer constituting the adhesive sheet disclosed herein preferably has a haze value of 2% or less at a thickness of 50 μm. For the adhesive layer for optical use, it is particularly meaningful that the haze value is 2% or less. The haze value of the adhesive layer is preferably from 0 to 1.5%, more preferably from 0 to 1%. The haze value can be attached to one surface of the alkali glass plate by an adhesive layer formed to have a thickness of about 50 μm, and measured by a haze meter. As the haze meter, MR-100 manufactured by Murakami Color Technology Research Institute or its equivalent can be used. In the measurement, the alkali glass plate to which the pressure-sensitive adhesive layer was attached was disposed such that the pressure-sensitive adhesive layer was on the light source side. In the case where the alkali glass itself has a haze value, the value obtained by subtracting the haze value of the alkali glass plate itself from the measured value is defined as the haze value of the adhesive layer. <Peeling Film> The release film in the technique disclosed herein is not particularly limited and may be appropriately selected depending on the purpose. Non-limiting examples of the release film that can be used include: a release treatment layer on one surface or both surfaces of the release film substrate, the surface of the release treatment layer being a release film of the release surface; and a fluorine-containing polymer (polymerized) A release film of a low adhesion resin such as tetrafluoroethylene or a polyolefin resin (such as polyethylene or polypropylene). As the release film substrate, a plastic film, paper (which may be a resin impregnated paper or a resin laminated paper), or the like can be used. The release treatment layer may be formed by subjecting the release film substrate to a surface treatment by a release treatment agent. Examples of the release treatment agent include a polyoxymethylene-based release treatment agent, a long-chain alkyl release treatment agent, a fluorine-based release treatment agent, and molybdenum sulfide (IV). In one aspect, a release film having a release treatment layer based on a polyoxynitride-based release treatment agent can be preferably used. As the release film disclosed herein, it can be preferably used as a release treatment layer on the surface of a plastic film as a release film substrate. The material constituting such a plastic film can be arbitrarily selected from the same materials as those exemplified as the plastic film for supporting the substrate. From the viewpoint of dimensional stability or strength, a plastic film comprising a polyester resin film (typically, a polyethylene terephthalate film) can be preferably used. It is preferably a plastic film having transparency in at least a portion of the region. In the technique disclosed herein, the plastic film used as the above-mentioned support substrate or release film substrate may be any of an unstretched film, a uniaxially stretched film, and a biaxially stretched film. Further, the plastic film may have a single layer structure or a multilayer structure including two or more sublayers. The above plastic film may also be formulated with an antioxidant, an anti-aging agent, a heat-resistant stabilizer, a light stabilizer, a UV absorber, a coloring agent such as a pigment or a dye, a lubricant, a filler, an antistatic agent, a nucleating agent, etc., which can be used for adhesion. A well-known additive for a support substrate or a release film substrate of a sheet. For the plastic film of the multilayer structure, each additive may be formulated in all of the sub-layers, or may be blended only in a part of the sub-layer. As the release film in the technique disclosed herein, a release film having a release treatment layer on the surface of a plastic film (release film substrate) and containing no particles or a release film containing particles having a diameter of 5 μm or less can be preferably used. The particles (especially inorganic particles) having a diameter of more than 5 μm contained in the release film can lower the smoothness of the release surface in the free state of the release film. Further, even if the release film containing particles having a diameter of more than 5 μm has high smoothness in a free state, the particles may be peeled off from the film due to bending deformation, tensile deformation, compression in the thickness direction, and the like of the release film. The protrusion is made to lower the smoothness of the peeling surface, and the smoothness of the adhesive surface in contact with the peeling surface is lowered. In one aspect, a release film which does not substantially contain particles having a diameter of more than 5 μm, that is, a release film which does not contain particles having a diameter of more than 5 μm, other than inadvertently mixed impurities, may be used. Further, the particles having a diameter of more than 5 μm may be, for example, inorganic particles which are blended in the release film substrate for the purpose of a lubricant, a pigment, a filler, or the like. Non-limiting examples of the inorganic particles may include ceria, alumina, kaolin, talc, mica, calcium carbonate, and the like. The thickness of the release film is not particularly limited. In terms of strength and flexibility, a release film having a thickness of about 10 μm to about 500 μm is usually preferably used. It is possible to suppress the smoothness of the adhesive surface due to the force of the peeling film (for example, the impurities which may be mixed when the adhesive sheet with the release film is wound into a spiral shape are pressed against the adhesive surface via the release film) The thickness of the release film is usually preferably about 20 μm or more, and more preferably about 25 μm or more (for example, about 30 μm or more) from the viewpoint of reducing the smoothness. Further, the thickness of the release film is usually preferably about 250 μm or less, preferably about 125 μm or less, from the viewpoints of workability (for example, easy winding property) of the release film itself or the adhesive sheet with the release film. It is about 100 μm or less, and more preferably about 80 μm or less. In one aspect, a release film having a thickness of about 75 μm or less (for example, about 50 μm or less) can be preferably used. The ten-point average roughness of the peeling surface of the first release film that abuts against the first adhesive surface of the adhesive sheet (Rz) _R1 ) can be set to, for example, about 2000 nm or less. From the viewpoint of suppressing the decrease in the smoothness of the first adhesive surface in the storage of the adhesive sheet with the release film, Rz _R1 It is preferably about 1500 nm or less, preferably about 1000 nm or less, more preferably about 500 nm or less, and still more preferably about 300 nm or less (for example, about 250 nm or less). When the first adhesive surface is a surface of the adhesive layer formed of the liquid adhesive composition on the release surface of the first release film, it is preferable to use Rz as the first release film. _R1 It is about 1200 nm or less (typically about 700 nm or less, more preferably about 500 nm or less, further preferably about 400 nm or less, for example, about 300 nm or less). Rz _R1 The lower limit is not particularly limited. From the viewpoints of ease of production or operability of the first release film, etc., in one aspect, Rz can be preferably used. _R1 It is a first release film of about 50 nm or more (for example, about 100 nm or more). When the adhesive sheet with a release film disclosed herein is in the form of a double-sided adhesive sheet comprising a double-sided adhesive sheet, a first release film, and a release film attached to the second release film, it is in contact with the double Ten-point average roughness of the peeling surface of the second release film of the second adhesive surface of the surface-adhesive sheet (Rz _R2 It is not particularly limited and may be, for example, about 3000 nm or more. In one aspect, Rz can be preferably used. _R2 The second release film of less than about 3000 nm (preferably about 2000 nm or less). Ten point average roughness Rz on the second adhesive surface _A2 In the case of 1000 nm or less, Rz is suppressed from the viewpoint of suppressing the smoothness of the second adhesive surface. _R2 It is preferably about 2000 nm or less (typically about 1500 nm or less, preferably about 1000 nm or less, more preferably about 500 nm or less, further preferably about 300 nm or less, for example, about 250 nm or less). When the second adhesive surface is a surface of the adhesive layer formed of the liquid adhesive composition on the release surface of the second release film, it is preferable to use Rz as the second release film. _R2 It is about 1200 nm or less (typically about 700 nm or less, more preferably about 500 nm or less, further preferably about 400 nm or less, for example, about 300 nm or less). Rz _R2 The lower limit is not particularly limited. In one aspect, Rz can be preferably used. _R2 It is a second release film of about 50 nm or more (for example, about 100 nm or more). In the technique disclosed herein, the release surface of the release film constituting the adhesive sheet with the release film preferably has smoothness similar to the smoothness of the adhesive surface abutting on the release surface. As a result, the smoothness of the adhesive surface during storage of the adhesive sheet with the release film is more sufficiently suppressed, and the performance stability of the adhesive sheet tends to be improved. In the adhesive sheet with the release film in one aspect, the difference between the first adhesive surface and the ten-point average roughness of the first peeling surface contacting the first adhesive surface, that is, |Rz _R1 -Rz _A1 | may be set to be about 300 nm or less (for example, about 250 nm or less), preferably about 150 nm or less, and more preferably about 100 nm or less. Further, from the viewpoint of performance stability of the adhesive sheet, it is preferable that the ten-point average roughness of the first adhesive surface is smaller than the ten-point average roughness of the first release surface. That is, preferably Rz _A1 <Rz _R1 , satisfying the above |Rz _R1 -Rz _A1 |Value and Rz _A1 <Rz _R1 The adhesive sheet with the release film of at least one of them (preferably both) can be made, for example, by the adhesive composition comprising the peeling surface of the first release film comprising the adhesive sheet constituting the release film. The method of drying or hardening the film is preferably manufactured. In the case where the adhesive sheet with the release film disclosed herein is in the form of a double-sided adhesive sheet comprising the double-sided adhesive sheet, the first release film, and the release film attached to the second release film, in one aspect, The difference between the second adhesive surface and the ten-point average roughness of the second peeling surface that is in contact with it, that is, |Rz _R2 -Rz _A2 | may be set to be about 300 nm or less (for example, about 250 nm or less), preferably about 150 nm or less, and more preferably about 100 nm or less. Further, from the viewpoint of performance stability of the adhesive sheet, it is preferable that the ten-point average roughness of the second adhesive surface is smaller than the ten-point average roughness of the second release surface. That is, preferably Rz _A2 <Rz _R2 . Meet the above|Rz _R2 -Rz _A2 |Value and Rz _A2 <Rz _R2 The adhesive sheet with a release film of at least one of them (preferably both) can be combined, for example, by a release surface included in the release surface of the first release film and the release surface of the second release film as will be described later. The liquid film hardening method of the article is preferably manufactured. The smoothness of the back surface of the release film constituting the adhesive sheet with the release film (that is, the surface opposite to the release surface) is not particularly limited. The adhesive sheet which can be wound into a spiral-shaped release film prevents the back surface of the release film from being lowered from the viewpoint of preventing the smoothness of the adhesive surface due to the unevenness of the back surface in the form of winding. The ten point average roughness is set to be about 5000 nm or less (preferably about 4000 nm or less, for example, about 3000 nm or less). The adhesive sheet disclosed herein (which may be an adhesive sheet contained in the adhesive sheet with a release film. The same applies hereinafter) may be applied to the first adhesive surface before the adhesive sheet is attached to the adherend. It is preferable to use a peeling film to be replaced with another peeling film. Hereinafter, the replacement release film is also referred to as "replacement film". Ten point average roughness (Rz) of the first peeling surface of the film (that is, the peeling surface disposed in contact with the first adhesive surface) _E1 It is not particularly limited and may be, for example, about 50 nm or more (typically about 100 nm or more). In one aspect, Rz can be preferably used. _E1 Replacement membranes above about 250 nm (more preferably above about 500 nm, such as over about 700 nm). Adhesive sheets disclosed herein for use with Rz _E1 In the use form of the replacement film of about 1000 nm or more (further, about 1200 nm or more, for example, about 1500 nm or more), the effect of suppressing the decrease in smoothness of the first adhesive surface can be remarkably exhibited. Rz _E1 The upper limit is not particularly limited. Rz is usually better used _E1 Replacement membranes below about 3000 nm (typically below about 2000 nm). In one aspect, replace the film with Rz _E1 It may be below about 1500 nm or below about 1000 nm. As the replacement film, the same configuration (material, thickness, surface roughness, and the like) as that of the release film before replacement may be used, and a different constitution may be used. In a preferred aspect, as a replacement film, Rz can be used. _E1 The value is 10 points average roughness (Rz) of the first peeling surface of the release film (which can be a newly produced release film) before replacement _R1 ) The big one. In one aspect, Rz can be used. _E1 /Rz _R1 It is a replacement film of about 2 or more (preferably about 3 or more). Adhesive sheets disclosed herein, for example, using Rz _E1 /Rz _R1 In the use form of the replacement film of about 5 or more (and further about 7 or more), the effect of suppressing the decrease in smoothness of the first adhesive surface can be remarkably exhibited. Rz _E1 /Rz _R1 The upper limit is not particularly limited, but is usually preferably about 20 or less (typically about 15 or less, for example, about 10 or less). <Application> The adhesive layer or the adhesive sheet disclosed herein is suitable for optical use because the smoothness of the adhesive surface is high and the smoothness of the adhesive surface is not easily impaired. For example, it is useful as an adhesive optical member using an optical member as the above-mentioned support substrate. Such an adhesive optical member can also be understood as a single side of a substrate attached to the first adhesive surface or the second adhesive surface of any of the double-sided adhesive sheets disclosed herein as a form of an optical member supporting the substrate. Adhesive sheet. Preferably, the second adhesive surface has an optical member. In this embodiment, an adhesive optical member having a release film attached to the first adhesive surface may be formed. In the case where an optical film is used as the above optical member, the above-mentioned adhesive type optical member can be used as an optical film with an adhesive layer. As the optical film, a polarizing plate, a retardation film, an optical compensation film, a brightness enhancement film, a hard coat (HC) film, an antireflection film, an impact absorption film, an antifouling film, a photochromic film, a light control film, or the like can be used. The wavelength-selective absorption film, the wavelength conversion film, and the like are formed by laminating the film. Adhesive layers or adhesive sheets disclosed herein are also suitable for use in the ophthalmic field. Further, the adhesive layer or the adhesive sheet of the present invention is not limited to the optical use or ophthalmic use as described above, and for example, an adhesive film such as an antifouling film, a heat insulating film, a buffer absorbent film or the like can be usually used as a support. The form is used for various purposes. The matters disclosed by this specification include the following. (1) An adhesive sheet comprising an adhesive layer, wherein the adhesive sheet has a first surface and a second surface, wherein the first surface is a first adhesive surface formed by one surface of the adhesive layer, Ten point average roughness of the above first bonding surface (Rz _A1 ) is about 1000 nm or less, and the elastic modulus of the above adhesive layer is stored at 100 ° C (G' ₁₀₀ ) is about 0.08 MPa or more. (2) The adhesive sheet according to (1) above, wherein the adhesive layer has a storage modulus of 100 ° C (G' ₁₀₀ Storage elastic modulus (G' relative to 23 ° C) _{twenty three} The ratio is about 35% or more. (3) The adhesive sheet according to (1) or (2) above, wherein the adhesive layer has a storage modulus of 23 ° C (G' _{twenty three} ) did not reach about 0.30 MPa. The adhesive sheet according to any one of the above aspects (1) to (3), wherein the second surface is a double-sided adhesive sheet having a second adhesive surface. (5) The adhesive sheet according to (4) above, wherein the tenth point average roughness of the second adhesive surface (Rz) _A2 ) is below about 2000 nm (eg, below about 1000 nm). (6) The adhesive sheet according to (4) or (5), wherein the second adhesive surface is formed of the other surface of the adhesive layer. (7) The adhesive sheet according to any one of (4) to (6), wherein the tenth point average roughness of the first adhesive surface (Rz) _A1 ) and the ten-point average roughness of the second adhesive surface (Rz _A2 Any of them is below about 500 nm. (8) The adhesive sheet according to any one of the above (4), wherein the tenth point average roughness of the first adhesive surface (Rz) _A1 ) and the ten-point average roughness of the second adhesive surface (Rz _A2 ) are all below about 500 nm. (9) The adhesive sheet according to any one of (4) to (8) above, wherein the tenth point average roughness of the first adhesive surface (Rz) _A1 ) and the ten-point average roughness of the second adhesive surface (Rz _A2 ) difference (|Rz _A1 -Rz _A2 |) is below about 250 nm. (10) The adhesive sheet according to any one of the above (1), wherein the adhesive sheet is a substrateless double-sided adhesive sheet comprising a single layer of an adhesive layer. The adhesive sheet according to any one of the above-mentioned (1), wherein the adhesive layer is contained in a ratio of more than 50% by weight of the polymer component contained in the adhesive layer (methyl). ) acrylic polymer. (12) The adhesive sheet according to the above (11), wherein the (meth)acrylic polymer contains the following component (A) as a monomer component constituting the (meth)acrylic polymer: An alkyl (meth)acrylate having an alkyl group having 2 to 18 carbon atoms at the ester terminal. (13) The adhesive sheet according to the above (11) or (12), wherein the ratio of the component (A) to the total monomer component is from about 30% by weight to about 70% by weight. The adhesive sheet according to any one of the above (11), wherein the (meth)acrylic polymer is a monomer component constituting the (meth)acrylic polymer. Further, the following component (B) is included: an alicyclic monomer. The adhesive sheet according to any one of the above (11), wherein the component (B) is selected from the group consisting of cyclopropyl (meth)acrylate and cyclobutyl (meth)acrylate, Methyl)cyclopentyl acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, cyclooctyl (meth) acrylate, (meth) acrylate At least one of a group consisting of a base ester and dicyclopentanyl (meth)acrylate. The adhesive sheet according to any one of the above (11), wherein the ratio of the component (B) to the entire monomer component is from about 20% by weight to about 50% by weight. The adhesive sheet according to any one of the above (11), wherein the (meth)acrylic polymer is a monomer component constituting the (meth)acrylic polymer. Further, it includes the following component (C): a monomer having at least one of a hydroxyl group and a carboxyl group. The adhesive sheet according to any one of the above (11), wherein the ratio of the component (C) to the entire monomer component is from about 15% by weight to about 30% by weight. The adhesive sheet according to any one of the above (11), wherein the (meth)acrylic polymer is a monomer component constituting the (meth)acrylic polymer. Further, a polyfunctional monomer is contained, and the ratio of the polyfunctional monomer to the entire monomer component is about 3% by weight or less. (20) The adhesive sheet according to any one of the above (11), wherein the (meth)acrylic polymer is an ultraviolet polymer of the monomer component. (21) A method of producing an adhesive sheet according to any one of the above (11) to (20), comprising the use of at least a part of the above monomer component in a form of a polymer The adhesive composition forms the above adhesive layer. (22) The method for producing an adhesive sheet according to the above aspect, wherein the adhesive layer is formed on the release surface of the release film, the adhesive composition is applied, and the adhesive composition is dried on the release surface or hardening. (23) The method for producing an adhesive sheet according to the above aspect (21), wherein the adhesive composition has an organic solvent content of about 5% by weight or less. The adhesive sheet manufacturing method according to any one of the above-mentioned (21), wherein the forming the adhesive layer comprises hardening the liquid film of the adhesive composition between the peeling faces of the pair of release films. The above adhesive layer is formed. (25) The adhesive sheet according to any one of the above (1) to (20), wherein the adhesive sheet according to any one of the above (1) to (20), and the first release film disposed on the first adhesive surface. (Embodiment) The adhesive sheet according to any one of the above (4) to (20), the first release film disposed on the first adhesive surface, and the arrangement a second release film on the second adhesive surface. (27) The adhesive sheet with a release film according to the above (25) or (26), wherein a ten-point average roughness of the peeling surface of the first release film in contact with the first adhesive surface (Rz) _R1 ) and the ten-point average roughness of the first adhesive surface (Rz _A1 The difference is about 250 nm. (28) The adhesive sheet with a release film as described in the above (26) or (27), which satisfies Rz _A1 <Rz _R1 And Rz _A2 <Rz _R2 . The adhesive sheet with a release film according to any one of the above aspects, wherein the first release film is selected from the group consisting of cerium oxide, aluminum oxide, kaolin, talc, mica, and calcium carbonate. At least one inorganic particle in the group formed. The adhesive sheet with a release film according to any one of the above-mentioned (25), wherein the thickness of the first release film is about 10 μm or more and about 500 μm or less (preferably about 20). Μm or more and about 100 μm or less, more preferably about 25 μm or more and about 80 μm or less). (31) An adhesive optical member comprising: the adhesive sheet according to any one of (4) to (20) above, and an optical member disposed on the second adhesive surface of the adhesive sheet. (32) A method of producing an article with an adhesive sheet, comprising: preparing an adhesive sheet with a release film according to any one of the above (26) to (30); and peeling off the first adhesive surface (1) The release film is attached to the exposed surface of the other release film on the exposed first adhesive surface; and the second adhesive surface is attached to the article as the adherend. (33) The method for producing an article with an adhesive sheet according to the above (32), wherein, as the another release film, a ten-point average roughness (Rz) of the peeling surface of the other release film is used. _E1 a ten point average roughness (Rz) larger than the peeling surface of the first release film in contact with the first adhesive surface _R1 )By. [Cross-reference to the related application] This application claims the Japanese Patent Application No. 2015-232149 filed on Nov. 27, 2015, and the Japanese Patent Application No. 2016-139538 filed on Jul. 14, 2016. The priority is hereby incorporated by reference in its entirety in its entirety in its entirety. [Examples] Several examples relating to the present invention are described below, but the present invention is not intended to be limited to the specific examples. <Preparation of Adhesive Composition> (Adhesive Composition C1) 40 parts by weight of n-butyl acrylate, 41 parts by weight of cyclohexyl acrylate, and 19 parts by weight of 4-hydroxybutyl acrylate were used as photoinitiator 2 , 2-dimethoxy-1,2-diphenylethane-1-one (manufactured by BASF Corporation, trade name "Irgacure 651") 0.05 parts by weight and 1-hydroxycyclohexyl-phenyl-ketone (BASF Corporation The product was produced by mixing 0.05 parts by weight of the product name "Irgacure 184", and irradiated with ultraviolet rays under a nitrogen atmosphere to prepare a partial polymer (monomer slurry). 0.1 parts by weight of 1,6-hexanediol diacrylate was added to the obtained monomer slurry, and uniformly mixed to prepare an adhesive composition C1. (Adhesive Compositions C2 to C4) In the preparation of the adhesive composition C1, the amount of 1,6-hexanediol diacrylate added was changed to 0.3 parts by weight in the adhesive composition C2, and the adhesive composition C3. 0.05 parts by weight, 0 parts by weight of the adhesive composition C4. Otherwise, the adhesive compositions C2 to C4 were prepared in the same manner as in the preparation of the adhesive composition C1. Further, these adhesive compositions C1 to C4 are all solvent-free compositions. Specifically, the content of the solvent in the adhesive compositions C1 to C4 is less than 5% by weight, and more specifically less than 1% by weight. <Preparation of Adhesive Sheet> Preparation: A release treatment layer based on the polyfluorene-based release treatment agent A1 on one side of a polyethylene terephthalate (PET) film F1 having a thickness of 38 μm, and a peeling surface (the above-mentioned peeling) The surface of the treated layer has a ten-point peeling film R1 having an average roughness of 211 nm; and one side of the PET film F2 having a thickness of 38 μm has a peeling-treated layer based on the polyfluorene-based stripping treatment agent A1, and ten points of the peeling surface a release film R2 having an average roughness of 1610 nm; and a release coating layer based on the polyfluorene-based release treatment agent A2 on one side of the PET film F2, and a peeling film R3 having a ten-point average roughness of 1610 nm on the peeling surface . The peeling surface of the peeling film R3 is formed so that the peeling strength from the adhesive layer is higher than the peeling surface of the peeling film R1 and R2. Using these release films, an adhesive sheet was produced in the following manner. Further, the ten-point average roughness of each of the peeling faces of the release films R1, R2, and R3 is a measured value obtained by dropping on a slide glass S1112 No. 2 (manufactured by Songlang Glass Industrial Co., Ltd.) by a dropper. In the same manner as in the measurement of the surface smoothness of the first adhesive surface to be described later, the water droplets were placed on the back surface of the peeling film (the surface which was not subjected to the peeling treatment). (Example 1) The above-prepared adhesive composition C1 was applied onto the release surface of the release film R1, and a liquid film of the above-described adhesive composition was formed on the release surface. The coating amount of the adhesive composition was adjusted so that the thickness of the finally formed adhesive layer became 50 μm. Then, the release film R3 is covered on the liquid film so that the peeling surface of the release film R3 is in contact with the liquid film. Thereby, the above liquid film is blocked from oxygen. In the state where the both surfaces (the first surface and the second surface) of the liquid film of the adhesive composition C1 are brought into contact with the release surfaces of the release films R1 and R3, respectively, a chemical lamp (manufactured by Toshiba Co., Ltd.) is used to irradiate 360. Second illumination 5 mW/cm ² The ultraviolet film is subjected to a polymerization reaction, whereby the liquid film is cured to form an adhesive layer, and the adhesive sheet S1 of the first embodiment including the adhesive layer (that is, the ultraviolet cured product of the liquid film) is obtained. The adhesive sheet S1 is formed by peeling off the peeling surfaces of the peeling films R1 and R3 used for the production of the adhesive sheet S1, respectively, on the first surface (first adhesive surface) and the second surface (second adhesive surface). Adhesive sheet of film. In addition, the value of the illuminance is a measured value obtained by an industrial UV detector (manufactured by TOPCON Co., Ltd., trade name "UVR-T1", light-receiving part model UD-T36) having a peak sensitivity of about 350 nm. (Examples 2 and 3) Examples 2 and 3 were obtained in the same manner as in the production of the adhesive sheet S1 of Example 1, except that the adhesive compositions C1 and C3 were used instead of the adhesive composition C1. Adhesive sheets S2, S3. The adhesive sheets S2 and S3 are formed so that the peeling surfaces of the peeling films R1 and R3 used for the production of the adhesive sheets are respectively brought into contact with the adhesive sheets of the peeling film attached to the first adhesive surface and the second adhesive surface. (Comparative Example 1) In the production of the adhesive sheet S2 of Example 2, a release film R2 was used instead of the release film R1. That is, the adhesive composition C2 is applied onto the release surface of the release film R2 to form a liquid film of the adhesive composition, and the release film is covered on the liquid film such that the release surface of the release film contacts the liquid film. R3. The adhesive sheet of Comparative Example 1 was obtained in the same manner as in Example 2 except that the ultraviolet ray was irradiated to the both sides of the liquid film of the adhesive composition C2 in contact with the peeling surfaces of the release films R2 and R3. Material S4. The adhesive sheet S4 is formed so that the peeling surfaces of the peeling films R2 and R3 used for the production of the adhesive sheet S4 are in contact with the adhesive sheets of the peeling film attached to the first adhesive surface and the second adhesive surface, respectively. (Comparative Example 2) An adhesive sheet S5 of Comparative Example 2 was obtained in the same manner as in the production of the adhesive sheet S1 of Example 1, except that the adhesive composition C4 was used instead of the adhesive composition C1. The adhesive sheet S5 is formed so that the peeling surfaces of the peeling films R1 and R3 used for the production of the adhesive sheet S5 are in contact with the adhesive sheets of the peeling film attached to the first adhesive surface and the second adhesive surface, respectively. Each of the adhesive sheets of the examples was stored in the form of the above-mentioned adhesive sheet with a release film at 23 ° C and 50% RH for 7 days after the production, and was subjected to the following measurement and test. <Measurement of Storage Elastic Modulus> An adhesive layer having a thickness of about 2 mm was formed by laminating a plurality of adhesive sheets of various examples (adhesive layers having a thickness of about 50 μm). A sample obtained by punching and fixing the adhesive layer into a disk shape of 7.9 mm in diameter by a parallel plate was used to perform dynamic adhesion by a viscoelasticity tester (manufactured by TA Instruments, ARES) under the following conditions. Elastic measurement, find the storage elastic modulus at 23 ° C (G' _{twenty three} And 100 ° C storage elastic modulus (G' ₁₀₀ ).・Measurement mode: Shear mode and temperature range: -70 °C to 150 °C ・Rate rate: 5 °C/min ・Measurement frequency: 1 Hz <10-point average roughness of the first adhesive surface in the initial configuration> At 23 °C In the environment of 50% RH, the release film on the second adhesive surface of each of the adhesive sheets was removed, and the exposed second adhesive surface was attached to the slide S1112 No. 2 (manufactured by Matsuron Glass Industrial Co., Ltd.). Then, the release film attached to the first adhesive surface of the adhesive sheet of the glass slide was peeled off by hand at a peeling speed of about 10 m/min in a 180-degree direction, and the surface roughness measuring device by the optical interference method was used. (Wyko NT-9100, manufactured by Veeco Co., Ltd.) The ten point average roughness of the exposed first adhesive surface was measured. The measurement was carried out within 10 minutes after the release film was removed from the first adhesive surface. The measurement conditions are as follows.・Measurement area/time: 622 μm × 467 μm (objective lens: 10 times, FOV (internal lens): 1.0 times) ・Measurement mode: VSI (Vertical Scan Interferometry) ・Back scan: 5 μm ・Measurement distance: 10 μm ・Threshold value: 0.1% ・Scanning speed: 1x (Single scan) The highest peak in the measurement surface is taken from the data obtained by the measurement, and the peak of the peak is recorded as H1. . The range of 11×11 pixels around H1 is masked, and the highest peak is taken outside the range of the mask, and the elevation of the peak is recorded as H2. This operation is repeated to specify H3 to H10. Thus, the elevation (H1 to H10) from the highest peak to the 10th peak is obtained. In the same manner, the elevation (L1 to L10) of the valley bottom from the lowest valley to the tenth valley in the measurement plane is obtained. Based on these values, Rz is calculated by the following formula. Where, H _j Indicates the height (level) of each peak, L _j Indicates the depth (elevation) of each valley. [Number 1] The measurement was carried out 5 times (i.e., N = 5), and the average value of the samples was determined. <10-point average roughness of the first adhesive surface after peeling film replacement> (Test Example 1) The first adhesive face of the adhesive sheet S1 of Example 1 was about 10 in an environment of 23 ° C and 50% RH. The peeling speed of m/min peeled off the peeling film R1 by hand in the direction of 180 degrees. Immediately after the exposed first adhesive surface, the 2 kg roller was reciprocated once at a moving speed of about 300 mm/min to bond the other release film R1. Thus, the release film R1 of the first adhesive surface of the protective adhesive sheet of Example 1 was replaced with another release film R1 (replacement and attachment). After maintaining it in an environment of 23 ° C and 50% RH for 2 hours, the peeled film R1 was peeled off by hand in a 180 degree direction at a peeling speed of about 10 m/min, and exposed in the same manner as described above. The ten point average roughness of the first adhesive surface was measured. (Test Example 2) In the test example, the release film R1 on the first adhesive surface of the adhesive sheet S2 of Example 2 was attached and attached as the release film R2. Otherwise, in the same manner as in Test Example 1, the ten-point average roughness of the first adhesive surface exposed by removing the attached release film R2 was measured. (Test Example 3) In the test example, the release film R1 on the first adhesive surface of the adhesive sheet S3 of Example 3 was attached and attached as the release film R2. Otherwise, in the same manner as in Test Example 1, the ten-point average roughness of the first adhesive surface exposed by peeling off the attached release film R2 was measured. (Test Example 4) In the test example, the release film R1 on the first adhesive surface of the adhesive sheet S4 of Comparative Example 1 was attached and attached as the release film R2. Otherwise, in the same manner as in Test Example 1, the ten-point average roughness of the first adhesive surface exposed by peeling off the attached release film R2 was measured. (Test Example 5) In the test example, the release film R2 on the first adhesive surface of the adhesive sheet S4 of Comparative Example 1 was attached and attached as the release film R1. Otherwise, in the same manner as in Test Example 1, the ten-point average roughness of the first adhesive surface exposed by peeling off the attached release film R1 was measured. (Test Example 6) In the test example, the release film R2 on the first adhesive surface of the adhesive sheet S5 of Comparative Example 2 was attached and attached as another release film R2. Otherwise, in the same manner as in Test Example 1, the ten-point average roughness of the first adhesive surface exposed by peeling off the attached release film R2 was measured. The results obtained are shown in Table 1. [Table 1] As shown in Table 1, for the adhesive sheet having the ten-point average roughness of the first adhesive surface of 1000 nm or less, it was confirmed that the elastic modulus of the 100 ° C storage layer of the adhesive layer constituting the first adhesive surface was obtained. When it is set to 0.08 MPa or more, the smoothness of the first adhesive surface due to the replacement of the release film can be remarkably suppressed. Further, in the adhesive sheet S4 having a low smoothness of the first adhesive surface in the initial configuration, the first adhesive was not found even if the release film on the first adhesive surface was replaced with higher smoothness. The smoothness of the surface is improved. The specific examples of the present invention have been described in detail above, but these are merely illustrative and are not intended to limit the scope of the application. The technology described in the patent application scope includes various changes and modifications to the specific examples described above.

1‧‧‧Adhesive sheet
1A‧‧‧1st face (1st adhesive face)
1B‧‧‧2nd face (2nd adhesive side)
2‧‧‧Adhesive sheets
2A‧‧‧1st face (1st adhesive face)
2B‧‧‧2nd surface (non-adhesive surface)
11‧‧‧
Adhesive layer
11A‧‧‧ a surface
11B‧‧‧Other surface
15‧‧‧
Support substrate
15A‧‧‧1st
15B‧‧‧2nd
twenty one‧‧‧
First release film
21A‧‧‧Surface (1st peeling surface)
21B‧‧‧Back
twenty two‧‧‧
Second release film
22A‧‧‧Surface (2nd peeling surface)
100‧‧‧Adhesive sheet with release film
200‧‧‧Adhesive sheet with release film

Fig. 1 is a schematic cross-sectional view showing an adhesive sheet with a release film comprising an adhesive sheet (a double-sided adhesive sheet having no substrate) of an embodiment. Fig. 2 is a schematic cross-sectional view showing an adhesive sheet comprising a release film of an adhesive sheet (single-sided adhesive sheet with a substrate) of another embodiment.

1‧‧‧Adhesive sheet

1A‧‧‧1st face (1st adhesive face)

1B‧‧‧2nd face (2nd adhesive side)

11‧‧‧Adhesive layer

11A‧‧‧ a surface

11B‧‧‧Other surface

21‧‧‧1st release film

21A‧‧‧Surface (1st peeling surface)

21B‧‧‧Back

22‧‧‧Second release film

22A‧‧‧Surface (2nd peeling surface)

100‧‧‧Adhesive sheet with release film

Claims (20)

An adhesive sheet comprising an adhesive layer, wherein the adhesive sheet has a first surface and a second surface, wherein the first surface is a first adhesive surface formed by one surface of the adhesive layer, and the first surface The ten-point average roughness of the adhesive surface is 1000 nm or less, and the 100 ° C storage elastic modulus of the above adhesive layer is 0.08 MPa or more. The adhesive sheet of claim 1, wherein a ratio of a storage modulus of the 100 ° C storage elastic modulus of the adhesive layer to a storage modulus of 23 ° C is 35% or more. The adhesive sheet of claim 1 or 2, wherein the 23 ° C storage elastic modulus of the adhesive layer is less than 0.30 MPa. The adhesive sheet according to any one of claims 1 to 3, wherein the adhesive layer contains a (meth)acrylic polymer in a ratio exceeding 50% by weight of the polymer component contained in the adhesive layer. The adhesive sheet according to claim 4, wherein the (meth)acrylic polymer comprises an alkyl (meth)acrylate having an alkyl group having 2 to 18 carbon atoms at the ester terminal as a constituent of the (meth)acrylic acid. The monomer component of the polymer. The adhesive sheet according to claim 5, wherein the alkyl (meth)acrylate having an alkyl group having 2 to 18 carbon atoms at the ester terminal is contained in the total monomer component in an amount of 30% by weight or more and 70%. Below weight%. The adhesive sheet according to any one of claims 4 to 6, wherein the (meth)acrylic polymer further comprises an alicyclic monomer as a monomer component constituting the (meth)acrylic polymer. The adhesive sheet according to any one of claims 4 to 7, wherein the ratio of the alicyclic monomer to the entire monomer component is 20% by weight or more and 50% by weight or less. The adhesive sheet according to any one of claims 4 to 8, wherein the (meth)acrylic polymer further comprises a monomer having at least one of a hydroxyl group and a carboxyl group as a constituent of the (meth)acrylic polymerization. The monomer component of the substance. The adhesive sheet according to any one of claims 4 to 9, wherein a ratio of the monomer having at least one of a hydroxyl group and a carboxyl group to the entire monomer component is 15% by weight or more and 30% by weight. the following. The adhesive sheet according to any one of claims 4 to 10, wherein the (meth)acrylic polymer further comprises a polyfunctional monomer as a monomer component constituting the (meth)acrylic polymer, the polyfunctional The ratio of the monomer to the entire monomer component is 3% by weight or less. The adhesive sheet according to any one of claims 4 to 11, wherein the (meth)acrylic polymer is an ultraviolet polymer of the above monomer component. The adhesive sheet according to any one of claims 1 to 12, wherein the second surface is a second adhesive surface. The adhesive sheet of claim 13, wherein the tenth point average roughness of the second adhesive surface is 2000 nm or less. The adhesive sheet of claim 14, wherein the tenth point average roughness of the second adhesive surface is 1000 nm or less. The adhesive sheet according to any one of claims 13 to 15, wherein one of the ten-point average roughness of the first adhesive surface and the ten-point average roughness of the second adhesive surface is 500 nm or less. The adhesive sheet according to any one of claims 13 to 16, wherein the second adhesive surface is composed of the other surface of the adhesive layer. An adhesive sheet comprising a release film, comprising: the adhesive sheet according to any one of claims 1 to 17, and a first release film disposed on the first adhesive surface. The adhesive sheet of the release film according to claim 18, wherein the second surface is a second adhesive surface, and the adhesive sheet with the release film further includes a second release film disposed on the second adhesive surface. The adhesive sheet with a release film according to claim 18 or 19, wherein the first release film has a release surface in contact with the first adhesive surface, and a ten-point average roughness of the release surface and ten of the first adhesive surface The difference in point average roughness is within 250 nm.