JP2017082032A - Adhesive sheet - Google Patents

Abstract

The present invention provides a pressure-sensitive adhesive sheet that can suppress the occurrence of air accumulation during sticking of the pressure-sensitive adhesive sheet and suppresses peeling after sticking, and can perform contact printing without defects. The task is to do.
The present invention is a pressure-sensitive adhesive sheet having a surface layer and a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer has groove portions each having two different points on the outer edge as start points and end points, and the average width of the groove portions. Is 0.1 to 0.9 mm, and the groove portion is provided with 10 to 80 grooves per 100 mm imaginary line including the most groove portions, and the plurality of groove portions are arranged without crossing each other. About.
[Selection] Figure 1

Description

  The present invention relates to an adhesive sheet. Specifically, this invention relates to the adhesive sheet which has a surface layer and the adhesive layer in which the groove part of the predetermined shape was formed.

  Conventionally, pressure-sensitive adhesive sheets having a surface layer and a pressure-sensitive adhesive layer have been used in various applications. For example, an adhesive sheet having a product name or the like printed on the surface layer is affixed to various products as an adhesive label. There are also a wide range of adhesive labels for sticking to products and equipment purchased by consumers.

The adhesive strength of the adhesive sheet is adjusted according to its application. In many cases, the pressure-sensitive adhesive sheet is required to have re-peelability. In such a case, the easy-peelability is improved by providing an intermittent portion in the pressure-sensitive adhesive layer.
For example, Patent Document 1 discloses a packaging adhesive tape (adhesive sheet). Here, by providing a wide groove in the pressure-sensitive adhesive layer, it has been proposed to suppress the accumulation of air during sticking or to provide removability.

Published Utility Showa 62-93345

  As described above, by providing intermittent portions such as grooves in the pressure-sensitive adhesive layer, it has been studied to suppress the occurrence of air accumulation between the pressure-sensitive adhesive layer and the adherend or to improve the removability of the pressure-sensitive adhesive sheet. Yes. However, in such a conventional pressure-sensitive adhesive sheet, there is a case where peeling occurs at an unintended place due to floating at the end of the sheet, which may not be suitable for some applications.

  By the way, although a brand name etc. may be printed on the surface layer of an adhesive sheet, such printing is generally performed after laminating a surface layer and an adhesive layer to make an adhesive sheet. . Such printing is often performed using a contact printing machine such as an offset printing machine. However, when the contact type printing is performed on the pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer having the intermittent portion as described above, it has been revealed by the inventors that printing defects such as printing unevenness occur. Since consumers often make a purchase decision after visually recognizing information on an adhesive sheet attached to a product, the occurrence of printing defects such as uneven printing becomes a serious problem.

In order to suppress printing defects at the time of performing contact printing or to suppress peeling of the pressure-sensitive adhesive sheet, it is preferable not to provide an intermittent portion in the pressure-sensitive adhesive layer. In this case, an air pocket is generated, which is not preferable in appearance.
That is, in the conventional pressure-sensitive adhesive sheet, it has not been achieved at the same time to suppress the occurrence of air accumulation, to suppress unintentional peeling of the pressure-sensitive adhesive sheet, and to suppress the occurrence of printing defects in contact printing, There was a need to develop an adhesive sheet that fulfilled all functions.

  Therefore, in order to solve such problems of the prior art, the present inventors are pressure-sensitive adhesive sheets that can suppress the occurrence of air pockets at the time of sticking of the pressure-sensitive adhesive sheet, the peeling after sticking is suppressed, contact type Investigations have been made for the purpose of providing an adhesive sheet that can be printed without defects.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that, in the pressure-sensitive adhesive sheet having the surface layer and the pressure-sensitive adhesive layer, an air pocket is formed by forming a groove having a predetermined configuration in the pressure-sensitive adhesive layer. It has been found that a pressure-sensitive adhesive sheet can be obtained that can suppress the occurrence of peeling and peeling after application, and can perform contact printing without any defects.
Specifically, the present invention has the following configuration.

[1] A pressure-sensitive adhesive sheet having a surface layer and a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer has grooves each having two different points on the outer edge as starting and ending points, and the average width of the grooves is 0.1. The pressure-sensitive adhesive sheet has a thickness of ˜0.9 mm, and 10 to 80 grooves are provided per 100 mm imaginary line including the largest number of grooves, and the plurality of grooves are arranged without crossing each other.
[2] The pressure-sensitive adhesive sheet according to [1], wherein 10 to 45 groove portions are provided per 100 mm imaginary line including the most groove portions.
[3] The pressure-sensitive adhesive sheet according to [1] or [2], wherein the pair of sides forming the groove is a non-linear side.
[4] The pressure-sensitive adhesive sheet according to any one of [1] to [3], wherein the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet for contact printing on which contact printing is performed.
[5] A release agent layer is further provided on one surface side of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to any one of [1] to [4], opposite to the surface on which the surface layer is laminated. An adhesive sheet with a release agent layer.
[6] A groove portion is formed including a step of forming a pressure-sensitive adhesive layer on the release agent layer, a step of forming a groove portion in the pressure-sensitive adhesive layer, and a step of laminating a surface layer on the pressure-sensitive adhesive layer having the groove portion. In the process, a method for producing a pressure-sensitive adhesive sheet in which 10 to 80 grooves each having an average width of 0.1 to 0.9 mm and having the largest number of grooves are formed per 100 mm of virtual lines.

  According to this invention, generation | occurrence | production of the air pocket at the time of sticking of an adhesive sheet can be suppressed. Moreover, it can suppress that an edge part etc. peel from an adherend by using the adhesive sheet of this invention. Furthermore, contact printing can be applied to the pressure-sensitive adhesive sheet of the present invention without any defects. Since the pressure-sensitive adhesive sheet of the present invention has the above-described configuration, it is preferably used as a pressure-sensitive adhesive sheet for forming a pressure-sensitive adhesive label attached to a product or the like.

FIG. 1 is a plan view and a cross-sectional view illustrating the configuration of the pressure-sensitive adhesive sheet of the present invention. FIG. 2 is an enlarged image diagram for explaining the linear shape of the side of the groove.

  Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be made based on representative embodiments and specific examples, but the present invention is not limited to such embodiments. In the present specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

(Adhesive sheet)
The present invention relates to a pressure-sensitive adhesive sheet having a surface layer and a pressure-sensitive adhesive layer. Here, an adhesive layer has a groove part which makes two different points on an outer edge start and end points, respectively. The average width of the groove is 0.1 to 0.9 mm. Further, 10 to 80 groove portions are provided per 100 mm of the virtual line including the most groove portions. Note that the plurality of grooves provided in this way are arranged so as not to cross each other.

FIG. 1 is a plan view and a cross-sectional view illustrating the configuration of the pressure-sensitive adhesive sheet of the present invention. Fig.1 (a) is a top view explaining the structure of the adhesive sheet 100 of this invention, and is the top view seen from the adhesive layer side. FIG.1 (b) is sectional drawing when the adhesive sheet 100 is cut | disconnected in the AA 'direction in Fig.1 (a). As shown in FIGS. 1A and 1B, the pressure-sensitive adhesive sheet 100 has a surface layer 10 and a pressure-sensitive adhesive layer 20, and has a groove T as an intermittent part of the pressure-sensitive adhesive layer 20. The groove part T contains two different points on the outer edge of the pressure-sensitive adhesive sheet 100 as a start point and an end point, respectively.
In addition, although it is preferable that the adhesive layer does not exist in the area | region of the groove part T and the surface layer 10 is exposed, a part of adhesive layer may exist in the groove part T. When a part of adhesive layer exists in the groove part T, it is preferable that the thickness of the adhesive layer of the part is 10% or less with respect to the thickness of the part in which an adhesive layer exists.

The start point and the end point may be two different points on the outer edge of the adhesive sheet. When the pressure-sensitive adhesive sheet is a quadrangle, the start point and the end point are preferably present on a pair of opposing sides, and the start point and the end point are a start point and an end point of a straight line representing the shortest distance between the pair of sides. It is preferable.
Further, the groove portion may be formed in a linear shape or may be formed in a curved shape. When the groove is formed in a straight line, for example, it is preferably a straight line having the start point and the end point as ends, but may be a zigzag shape having the start point and end point as ends. When the groove is formed in a curved shape, for example, it may have an arc shape with the start point and end point as ends, or may have a wavy shape with the start point and end point as ends. .
In the present invention, the groove is preferably formed in a straight line as shown in FIG. 1, and in this case, the groove is centered on a straight line representing the shortest distance between a pair of opposing sides. It is preferable to contain as.

  10 to 80 groove portions are provided per 100 mm of the virtual line including the most groove portions, and the plurality of groove portions are arranged without intersecting each other. That is, the plurality of groove portions are disposed without contacting each other. More preferably, the plurality of groove portions are arranged substantially parallel to each other.

The average width of the grooves may be 0.1 to 0.9 mm, preferably 0.2 to 0.8 mm, and more preferably 0.3 to 0.7 mm. Here, the average width of the grooves can be measured by magnifying and observing the pressure-sensitive adhesive layer side with an electron microscope or the like. In the specification of the present application, the average width of the groove portions is determined by measuring the width of 10 portions per groove portion, and setting the average value of the widths of the 10 locations as the width B ₁ of the groove portion for one groove portion. The average value of the widths (B _n (n = 1 to 10)) is calculated.
By making the average width of the grooves within the above range, it is possible to suppress the occurrence of printing defects such as uneven printing and missing when performing contact printing on the pressure-sensitive adhesive sheet. In addition, by setting the average width of the grooves within the above range, it is possible to suppress unintended peeling at the end of the pressure-sensitive adhesive sheet after the pressure-sensitive adhesive sheet is attached to the adherend. Furthermore, when an adhesive sheet is attached to an adherend, it is possible to suppress the occurrence of air accumulation between the adhesive layer and the adherend, and even if air accumulation occurs, it is easy to remove air. it can.

The groove part should just be provided 10-80 per 100 mm of virtual lines containing the most groove part, It is preferable that 10-60 are provided, and it is more preferable that 10-45 is provided. Here, the virtual line including the most groove portions is a line including the most groove portions among arbitrary lines drawn on the surface of the pressure-sensitive adhesive sheet. When the pressure-sensitive adhesive sheet has a quadrangular shape and grooves as shown in FIG. 1 are formed, the imaginary line including the most grooves is a line parallel to the width direction of the pressure-sensitive adhesive sheet.
The number of the groove portions can be measured by visual confirmation, or can be measured after magnifying and observing the pressure-sensitive adhesive layer side with an electron microscope or the like. Note that the number of groove parts includes those in which a part of the groove parts are filled with an adhesive, but in this case, 80% or more of the total length of the groove parts can be confirmed as grooves.
By setting the number of groove portions within the above range, it is possible to suppress the occurrence of air accumulation between the pressure-sensitive adhesive layer and the adherend when the pressure-sensitive adhesive sheet is attached to the adherend. In addition, by setting the number of the groove portions within the above range, it is possible to suppress unintended peeling at the end of the pressure-sensitive adhesive sheet after the pressure-sensitive adhesive sheet is attached to the adherend.

In the pressure-sensitive adhesive sheet of the present invention, x / y is preferably larger than 0.01, where x is the average width of the grooves and y is the average width of the pressure-sensitive adhesive layer. Further, x / y is preferably smaller than 0.3, and more preferably smaller than 0.2.
Here, the average width y of the pressure-sensitive adhesive layer can be measured by magnifying and observing the pressure-sensitive adhesive layer side with an electron microscope or the like. The average width of the pressure-sensitive adhesive layer is determined by measuring the width of 10 positions for one pressure-sensitive adhesive layer, and setting the average value of the widths of the 10 positions as the width C ₁ of one pressure-sensitive adhesive layer (width of 10 groove portions ( The average value of C _n (n = 1 to 10) is calculated.

  In the pressure-sensitive adhesive sheet of the present invention, a predetermined number of grooves having the average width as described above are provided. In the pressure-sensitive adhesive sheet of the present invention, the balance between the average width and number of grooves is important, and by setting these within a predetermined range, the printability when performing contact printing on the surface layer of the pressure-sensitive adhesive sheet is good. In addition, it is possible to suppress the occurrence of air accumulation between the pressure-sensitive adhesive layer and the adherend. Furthermore, it can suppress that the edge part of an adhesive sheet, etc. peel from the adherend unintentionally. As described above, since the pressure-sensitive adhesive sheet obtained in the present invention has good printability, it is excellent in information visibility and design, and attention is paid to the occurrence of air pockets when the pressure-sensitive adhesive sheet is attached to an adherend. Since it is not necessary, the pasting operation can be easily performed.

  In the specification of the present application, the fact that air accumulation is unlikely to occur between the adhesive layer and the adherend means that the air is easily removed, and even if air accumulation occurs, the air is extracted. It also means that it can be done easily.

  It is preferable that a pair of side sides which comprise a groove part are non-linear sides. In the specification of the present application, the shape of the entire groove is different from the linear shape of the pair of sides forming the groove, and even if the shape of the entire groove is a straight line, The side is preferably a non-linear side. That is, when the shape of the entire groove portion is a straight line, the center line of the groove portion is a straight line. In this case as well, it is preferable that the pair of side sides constituting the groove portion are non-linear sides.

  FIG. 2 is an enlarged image diagram for explaining the linear shape of the side of the groove. In FIG. 2, the groove T is a region where the surface layer 10 is exposed, and a pair of side sides (long sides) of the groove T are non-linear. Here, the pair of side sides (long sides) of the groove T being non-linear means that the pair of side sides (long sides) have an uneven shape. In the present invention, it is particularly preferable that the pair of side sides (long sides) of the groove T have a fine uneven shape as shown in FIG.

The pressure-sensitive adhesive sheet of the present invention is preferably a pressure-sensitive adhesive sheet for contact printing to which contact printing is performed. Here, contact printing refers to a printing method in which printing is performed when at least a plate or a mold contacts the surface layer. Examples of contact printing include gravure printing, flexographic printing, offset printing, and screen printing. Contact printing is distinguished from non-contact printing represented by, for example, an inkjet printing method.
By using the pressure-sensitive adhesive sheet of the present invention, it is possible to suppress the occurrence of uneven printing or the occurrence of print omission even when contact printing is performed on the pressure-sensitive adhesive sheet.

(Surface layer)
The pressure-sensitive adhesive sheet of the present invention has a surface layer. The material of the surface layer is not particularly limited. For example, a resin substrate including various resin films, a paper substrate, a nonwoven fabric, or the like can be used for the surface layer. As resin base materials, PVC (polyvinyl chloride) film, PET (polyethylene terephthalate) film, PE (polyethylene) film, PP (polypropylene) film, PO (polyolefin) film, PS (polystyrene) film, silicone film, etc. Can be mentioned. Examples of the paper substrate include coated paper, high quality paper, medium quality paper, and synthetic paper. Examples of the nonwoven fabric include nonwoven fabrics containing fibers such as cellulose, nylon, rayon and PP fibers, and those obtained by bonding polyolefin, polyester, etc. to such nonwoven fabrics.

As the resin substrate, a PP (polypropylene) film or a PET (polyethylene terephthalate) film can be preferably used, and among them, a PP (polypropylene) film is preferably used.
As the paper substrate, it is preferable to use high-quality paper or synthetic paper, and it is particularly preferable to use high-quality paper. Examples of synthetic paper include YUPOCOAT (registered trademark) manufactured by YUPO Corporation.

  The thickness of the surface layer is preferably 10 to 500 μm, more preferably 30 to 300 μm, and still more preferably 40 to 200 μm. By making the thickness of the surface layer within the above range, the shape stability of the pressure-sensitive adhesive sheet can be enhanced. Specifically, when contact printing or the like is performed on the pressure-sensitive adhesive sheet, wrinkles or deformation of the pressure-sensitive adhesive sheet can be suppressed.

(Adhesive layer)
Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer include a solvent-type pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive, and a hot-melt type pressure-sensitive adhesive. Among these, a solvent-type pressure-sensitive adhesive is preferably used from the viewpoint of easily forming the groove.

A solvent-type adhesive contains an adhesive (adhesive component) in an organic solvent. Adhesives that make up solvent-based adhesives include acrylic adhesives, polyester adhesives, urethane adhesives, polyether adhesives, rubber adhesives, silicone adhesives, polyamide adhesives, and fluorine adhesives. Various known pressure-sensitive adhesives such as pressure-sensitive adhesives can be mentioned. Especially, in this invention, it is preferable to use an acrylic adhesive.

  The acrylic polymer that is the base polymer of the acrylic pressure-sensitive adhesive is formed by polymerizing a (meth) acrylic monomer. As the acrylic polymer, a known polymer can be used. For example, polymerizable monomers having carboxyl groups or anhydride groups such as (meth) acrylic acid, itaconic acid, (anhydrous) maleic acid, (anhydrous) fumaric acid, crotonic acid, alkyl (meth) acrylate [methyl (meth) Acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, lauryl (meth) acrylate, etc.], mono (meth) such as 2-hydroxyethyl (meth) acrylate Di (meth) acrylates such as acrylate, diethylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, tri (meth) acrylates such as pentaerythritol tri (meth) acrylate, (meth) acrylamide, N, N-dimethyl Meth) acrylamide, (meth) acrylamide, (meth) homopolymers of monomers selected from acrylic monomers, and copolymers of selecting two or more, include multiple polymers such as terpolymers. The acrylic polymer may be copolymerized with a monomer other than the above (other monomers) as long as the effects of the present invention are not significantly impaired.

  Among them, in the present invention, it is preferable to use an acrylic solvent-based pressure-sensitive adhesive. The acrylic solvent-based pressure-sensitive adhesive is easy to form a groove and has excellent processability. Moreover, it is excellent also in stability after forming a groove part, and there exists an advantage that it is easy to maintain the shape of a predetermined groove part.

In the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer, a tackifier may be blended for the purpose of improving the tackiness, and a softener may be blended in consideration of apparatus compatibility.
Examples of the tackifier include rosin, ester gum, ester gum H, polyterpene resin, C5 petroleum resin, C9 petroleum resin, DCPD petroleum resin, styrene resin, alkylphenol resin, terpene phenol resin, and water thereof. Additives and the like. Of these, polyterpene resins, hydrogenated C5 petroleum resins and hydrogenated C9 petroleum resins are preferably used.
Examples of the softener include various plasticizers, polybutene, liquid tackifier resin, polyisobutylene low polymer, polyvinyl isobutyl ether low polymer, lanolin, depolymerized rubber, process oil, naphthenic oil, paraffinic oil, additive And sulfur oil.
In addition, a thickener, a pH adjuster, an antifoaming agent, an antiseptic / antifungal agent, a pigment, an inorganic filler, a stabilizer, a wetting agent, a wetting agent and the like can be blended as necessary.

The pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer measured in accordance with JIS Z 0237 is preferably 10 to 100 N / 50 mm, more preferably 15 to 60 N / 50 mm, and more preferably 20 to 30 N / 50 mm. More preferably. Here, the said adhesive force is an adhesive force in the state which has a groove part. By setting the adhesive strength of the pressure-sensitive adhesive layer within the above range, the adhesiveness between the pressure-sensitive adhesive sheet and the adherend can be increased, and the pressure-sensitive adhesive sheet can be prevented from unintentionally peeling from the adherend.

  The pressure-sensitive adhesive sheet of the present invention may have removability. In this case, the adhesive strength of the pressure-sensitive adhesive layer measured in accordance with JIS Z 0237 in a 23 ° C. environment is preferably 0.1 to 20 N / 50 mm, more preferably 0.2 to 15 N / 50 mm. More preferably, it is 0.5-10N / 50mm. By setting the adhesive strength of the pressure-sensitive adhesive layer within the above range, it is possible to improve the removability when the pressure-sensitive adhesive sheet is peeled from the adherend, and the pressure-sensitive adhesive sheet can be peeled from the adherend without any adhesive residue.

The storage modulus of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is preferably 5 × 10 ^{3 to} 5 × 10 ⁶ Pa, preferably 1 × 10 ^{4 to} 5 × 5 Pa. More preferably, it is × 10 ⁵ Pa. As long as the storage elastic modulus is within the range of 1 Hz and 0 to 60 ° C., it is preferable that the storage elastic modulus of the pressure-sensitive adhesive is within the above range regardless of the temperature conditions. When the storage elastic modulus is not less than the above lower limit, the removability can be improved while improving the adhesion to the adherend.

  The thickness of the pressure-sensitive adhesive layer is preferably 1 to 100 μm, more preferably 5 to 80 μm, and further preferably 10 to 50 μm. By setting the thickness of the pressure-sensitive adhesive layer within the above range, it is possible to effectively suppress the occurrence of air pockets when the pressure-sensitive adhesive sheet is attached to an adherend.

(Release agent layer)
The present invention relates to a pressure-sensitive adhesive sheet with a release agent layer further having a release agent layer on one surface side of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet and opposite to the surface on which the surface layer is laminated. Also good. By providing such a release agent layer, it is possible to prevent adhesion parts such as dust and dust from adhering to the surface of the pressure-sensitive adhesive layer. Thereby, the fall of the adhesiveness of an adhesive layer and a to-be-adhered body can be prevented.
For example, a well-known release sheet is used as the release agent layer. As a known release sheet, for example, on the surface of paper such as cast coated paper, art paper, coated paper, high quality paper, kraft paper, glassine paper, etc., after forming a sealing layer as required, silicone-based, etc. And a release sheet coated with a silicone-based release agent on a film such as PET or PP.

  The pressure-sensitive adhesive sheet of the present invention does not have a release agent layer, and may be a pressure-sensitive adhesive sheet having a two-layer structure of a surface layer and a pressure-sensitive adhesive layer. In this case, the tape is wound into a roll. Also good. Moreover, also in the case of the adhesive sheet with a release agent layer which has a release agent layer, it may be stored in the state wound up by roll shape.

(Method for producing adhesive sheet)
The method for producing a pressure-sensitive adhesive sheet of the present invention includes a step of forming a pressure-sensitive adhesive layer on a release agent layer, a step of forming a groove in the pressure-sensitive adhesive layer, and a step of laminating a surface layer on the pressure-sensitive adhesive layer having the groove. including. In the step of forming the groove portions, the groove portions having an average width of 0.1 to 0.9 mm and 10 to 80 groove portions that do not intersect each other are formed per 100 mm of the imaginary line including the most groove portions. A well-known method is employable as a formation method of a groove part.

(Use of adhesive sheet)
The pressure-sensitive adhesive sheet of the present invention is preferably used for forming a pressure-sensitive adhesive label attached to a product or the like. The pressure-sensitive adhesive label is preferably printed on the surface layer of the pressure-sensitive adhesive sheet of the present invention. That is, the pressure-sensitive adhesive label preferably has a surface layer having a printed layer and a pressure-sensitive adhesive layer. Such an adhesive label is attached to, for example, a glass container, a resin container, a metal product, or the like. Since the pressure-sensitive adhesive sheet of the present invention has the above-described configuration, it can be easily peeled off from the product when the product container is disposed after being attached to the product.

  The features of the present invention will be described more specifically with reference to examples and comparative examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

Example 1
A release sheet (trade name: “G7B” manufactured by Oji Tac Co., Ltd.), 100 parts by mass of an acrylic re-peeling adhesive (trade name: “BPS-5330” manufactured by Toyochem Co., Ltd.) and a crosslinking agent (trade name: “BXX-5134”). “) A coating solution containing 2 parts by mass was applied to form grooves and dried. Subsequently, it bonded together with the film base material (PP base material) with a film thickness of 80 micrometers as a surface layer, the adhesive sheet was produced, and it was set as the adhesive sheet of Example 1. FIG.

(Example 2)
Example 1 except that the pressure-sensitive adhesive was changed to 100 parts by mass of a highly viscous pressure-sensitive adhesive (trade name: “BPS-1109” manufactured by Toyochem Co., Ltd.) and the crosslinking agent was changed to 2 parts by mass of “BHS-8515” (trade name). A pressure-sensitive adhesive sheet was produced in the same manner as in Example 2 to obtain a pressure-sensitive adhesive sheet of Example 2.

(Example 3)
A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 except that the film base material was high-quality paper (manufactured by Oji Paper Co., Ltd.).

Example 4
A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 2 except that the film base material was high-quality paper (manufactured by Oji Paper Co., Ltd.).

(Comparative Examples 1-3)
The adhesive sheet of Comparative Examples 1-3 was produced like Example 1 except having changed the adhesive stripe width | variety and the number as described in the table | surface.

(Comparative Examples 4-7)
Adhesive sheets of Comparative Examples 4 to 7 were prepared in the same manner as in Example 2 except that the adhesive streak width and the number were changed as described in the table.

(Evaluation)
<Printability>
Printing was performed on the surface layer of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples. The printability at that time was evaluated according to the following evaluation criteria.
○: Printing good △: Printing unevenness may occur ×: Printing missing

<Air escape characteristics>
The pressure-sensitive adhesive sheets obtained in the examples and comparative examples were cut to a size of 100 × 50 mm and attached to a plastic container. The pasting operation was performed from one side having the start point or end point of the pressure-sensitive adhesive sheet toward the opposite side. Thereafter, the adhesive layer and the air remaining on the surface of the container were observed and evaluated according to the following evaluation criteria.
○: Even if air pool (air) enters, air can be removed by leveling by hand. △: There are many parts where air does not escape even if the air pool (air) is leveled by hand. ×: Air pool (air ) Does not come off at all

<Pasteability>
The pressure-sensitive adhesive sheets obtained in the examples and comparative examples were cut to a size of 100 × 50 mm and attached to a plastic container. The state of the adhesive sheet after pasting was observed and evaluated according to the following evaluation criteria.
○: Adhering to the entire surface △: Adhesive sheet edge slightly floats x: Adhesive sheet edge largely floats

  The pressure-sensitive adhesive sheets obtained in the examples were excellent in printability and good in air release properties, so that the occurrence of air pockets was suppressed. Moreover, it was suppressed that an edge part peeled after affixing on a to-be-adhered thing, and high evaluation was obtained in all of printability, air bleedability, and affixability.

10 Surface layer 20 Adhesive layer 100 Adhesive sheet T Groove

Claims (6)

A pressure-sensitive adhesive sheet having a surface layer and a pressure-sensitive adhesive layer,
The pressure-sensitive adhesive layer has grooves each having two different points on the outer edge, each having a start point and an end point,
The average width of the groove is 0.1 to 0.9 mm,
The groove part is provided 10 to 80 per 100 mm imaginary line including the most groove part,
The adhesive sheet in which the plurality of groove portions provided are arranged without crossing each other.   The pressure-sensitive adhesive sheet according to claim 1, wherein 10 to 45 of the groove portions are provided per 100 mm imaginary line including the most groove portions.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the pair of side edges constituting the groove are non-linear sides.   The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet for contact printing on which contact printing is performed.   The peeling which further has a releasing agent layer in the one surface side of the adhesive layer of the adhesive sheet of any one of Claims 1-4, and the surface side opposite to the surface on which the said surface layer was laminated | stacked. Adhesive sheet with agent layer. Forming a pressure-sensitive adhesive layer on the release agent layer;
Forming a groove in the pressure-sensitive adhesive layer;
Laminating a surface layer on the pressure-sensitive adhesive layer having the groove,
In the step of forming the groove portion, the pressure-sensitive adhesive sheet is a groove portion having an average width of 0.1 to 0.9 mm, and 10 to 80 non-intersecting groove portions are formed per 100 mm of the virtual line including the most groove portions. Production method.

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