JP2008150494A - Curved part adhesive sheet, method for producing the same, and adhesive method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curved part pasting pressure sensitive adhesive sheet which hardly peels off when pasted on a curved part and has both excellent removability.
A curved portion-attached pressure-sensitive adhesive sheet to be attached to a curved portion to be attached having a curved portion that is curved in a uniaxial direction, comprising at least a resin base material, an adhesive layer, a decoration layer, and a resin laminate layer. The resin substrate is made of a biaxially stretched resin film, the pressure-sensitive adhesive layer is provided on one surface of the resin substrate, and the decorative layer and the resin laminate layer are formed on the other surface of the resin substrate. Is provided, and a curved portion-adhered pressure-sensitive adhesive sheet in which the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to an object to be applied are substantially orthogonal directions.
[Selection] Figure 6

Description

  TECHNICAL FIELD The present invention relates to a curved portion pasting pressure-sensitive adhesive sheet to be pasted on a curved portion to be pasted having a curved portion curved in a uniaxial direction, a manufacturing method thereof, and a pasting method.

  Conventionally, stickers such as advertisement stickers and stickers have been attached to vending machines and the like in the promotion display of various products and display of advertisements such as campaign events. These promotional stickers are preferably affixed near the line of sight to enhance the eye-catching effect, but vending machines usually have an exhibition window with product samples displayed near the line of sight. Since it is provided, it is often attached to the outer periphery of the exhibition window. In this case, since the width of the outer periphery of the display window on the front of the vending machine is narrow, in order to ensure the amount of information on the stickers and to enhance the eye catching effect from the perspective direction, such as the corner from the front of the vending machine to the side Stickers may be attached to curved parts such as curved surfaces.

  It is an important characteristic that such stickers do not peel when attached to the curved portion. In addition, sales promotion stickers are not permanently affixed, and are often peeled off after a certain period. For this reason, it is necessary to have workability at the time of peeling and re-peeling property that does not cause adhesive residue after peeling.

  Examination of stickers excellent in adhesion to a curved portion and removability has been made in the past, for example, a pressure-sensitive adhesive product having a pressure-sensitive adhesive layer having a specific ratio of adhesive force and peeling speed is disclosed. (See Patent Document 1). Moreover, while using the adhesive layer which has the peelability and adhesive force of an adhesive, the adhesive film using the base material and laminated member which have a specific physical property is disclosed (refer patent document 2). These pressure-sensitive adhesive products and pressure-sensitive adhesive films are excellent in adhesion to curved parts and removability. However, since adhesiveness and removability are contradictory properties, the adhesive layer and adhesive film can be applied only by improving the properties of the pressure-sensitive adhesive layer. When the curvature of the object has increased or the area to be applied to the curved portion has decreased, it has been difficult to suppress peeling. Further, when the adhesive force is improved in order to prevent peeling, there are problems that re-peelability is remarkably lowered and adhesive residue is generated. Therefore, the adhesive sheet which can suppress peeling also when it affixes on the curved part with a large curvature and a small sticking area like the said use, and is exposed to an external air environment for a long term for 1 to several months has been anxious.

JP 2002-155248 A JP 2004-231886 A

  The problem to be solved by the present invention is to provide a pressure-sensitive adhesive sheet with a curved portion that is unlikely to peel off when applied to a curved portion. Furthermore, this invention is providing the curved part sticking adhesive sheet which can combine the outstanding removability.

  In the present invention, in view of the actual situation, it is difficult to combine contradictory properties such as a property that it is difficult to peel off when attached to a curved portion and a property that is excellent in removability only by improving the properties of the pressure-sensitive adhesive layer. In addition, intensively studying the direction control when laminating the laminated members of the pressure-sensitive adhesive sheet, which has not been sufficiently studied in the past, and arranging the resin base material and the direction in which the decorative layer is curved with a suitable directionality The curling of the pressure-sensitive adhesive sheet can be controlled by the above, and the shrinkage force and elongation force of the laminate layer can be appropriately adjusted by the resin base material by further controlling the directionality of the resin laminate layer in addition to the directionality. The pressure-sensitive adhesive sheet was found to be able to follow the surface, and a pressure-sensitive adhesive sheet extremely suitable for bending portion bending was realized.

  That is, the present invention is a curved-part-adhesive adhesive sheet to be attached to a curved part to be applied having a curved part that is curved in a uniaxial direction, and includes at least a resin base material, an adhesive layer, a decoration layer, and a resin laminate layer. The resin base material is made of a biaxially stretched resin film, the pressure-sensitive adhesive layer is provided on one surface of the resin base material, and the decoration layer and the resin laminate are provided on the other surface of the resin base material. A curved portion-adhered pressure-sensitive adhesive sheet in which the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to an object to be applied are substantially orthogonal to each other. is there.

The present invention also includes a resin base material composed of at least a biaxially stretched resin film, an adhesive layer, a decorative layer, and a resin laminate layer, and is attached to a curved portion of an object to be pasted having a curved portion that is curved in a uniaxial direction. A method for producing a curved portion-attached pressure-sensitive adhesive sheet,
Providing an adhesive layer on one surface of the resin substrate;
The decorative layer is provided on the surface having the pressure-sensitive adhesive layer and the other surface of the resin base material so that the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to the object to be applied are substantially orthogonal. Laminating process,
The manufacturing method of the curved part sticking adhesive sheet which has these is provided.

Furthermore, the present invention is a pasting method for pasting an adhesive sheet to a target to be pasted having a curved portion curved in a uniaxial direction,
Having at least a resin base material, an adhesive layer, and a resin laminate layer,
The pressure-sensitive adhesive layer is provided on one surface of the resin base material, and the resin laminate layer is provided on the other surface of the resin base material, and the final stretching direction of the resin base material and the resin laminate The pressure-sensitive adhesive sheet having a substantially parallel direction to the tension application direction when laminating the layers is substantially orthogonal to the final stretching direction of the resin base material and the direction of bending of the object to be pasted having a curved portion curved in a uniaxial direction. The present invention provides a method for attaching an adhesive sheet to be attached in a direction.

  Since the adhesive part adhesive sheet of the present invention has a characteristic that the sheet itself follows the curved part, peeling hardly occurs when the adhesive part is attached to the curved part. Moreover, it is not necessary to strengthen the adhesive force of the pressure-sensitive adhesive layer in order to prevent peeling from the curved portion, and it is easy to realize excellent removability and reduce adhesive residue.

  The curved portion-attached pressure-sensitive adhesive sheet of the present invention having such characteristics is extremely useful for stickers that are attached to corner portions of vending machines. Moreover, it is useful as a sticker or a sticker for sticking various curved parts such as seals attached to a cylindrical product, not limited to the application.

The curved portion pasting adhesive sheet of the present invention is a curved portion pasting adhesive sheet to be pasted on a curved portion of a subject to be pasted having a curved portion curved in a uniaxial direction,
Having at least a resin substrate, an adhesive layer, a decorative layer, and a resin laminate layer,
The resin substrate is made of a biaxially stretched resin film,
The pressure-sensitive adhesive layer is provided on one surface of the resin base material, and the decoration layer and the resin laminate layer are provided on the other surface of the resin base material,
It is a bending part sticking adhesive sheet in which the final extending direction of the resin base material and the direction in which the decorative layer curves when being attached to an object to be attached are substantially orthogonal directions.

[Target to be pasted]
The object to be pasted to which the curved part pasting adhesive sheet of the present invention is pasted can exhibit an excellent effect when it has a curved part curved in at least a uniaxial direction. Here, the curved part is a convex part such as a corner part curved in an arc shape (FIG. 1), a corner part having one or more corner parts (FIGS. 2 and 3), or a part of the periphery of a cylindrical side. A bent shape part.

  Examples of such a curved portion include a rectangular parallelepiped shape such as an electric appliance such as a TV or a PC in which a corner portion is formed by an arc-shaped curved portion or corner portion, or a vending machine installed outdoors. A cylindrical shape such as one having a chamfered corner of the rectangular parallelepiped shape, various containers such as cosmetics and detergent containers and household goods, and a sign pole installed outdoors. The thing etc. can be illustrated.

[Resin substrate]
Examples of the resin base material used in the present invention include ethylene resins such as high density polyethylene and medium density polyethylene, polyolefin resins such as propylene resin, polymethyl-1-pentene, ethylene-cyclic olefin copolymer, nylon- 6, Thermoplastics such as polyamide resins such as nylon-6,6, nylon-6,10, nylon-6,12, nylon-6, T, polyethylene terephthalate and copolymers thereof, polyethylene naphthalate, aliphatic polyester A resin film made of a thermoplastic resin such as polyester resin, polycarbonate, atactic polystyrene, syndiotactic polystyrene, or polyphenylene sulfide can be used. Moreover, the resin film in which 2 or more types of these resin were mixed may be sufficient. Among these, it is preferable to use polyolefin resin.

  As the resin film, a biaxially stretched film can be used. Since the biaxially stretched film has high mechanical strength and rigidity, it is suitable for affixing, reattaching, and peeling workability. Elongation and curling of materials are difficult to occur. In addition, since the biaxially stretched film is stretched in one direction and then stretched in the direction orthogonal to the direction, the biaxially stretched film is excellent in flexibility in the direction orthogonal to the final stretch direction.

  The molding method of the resin film for forming the resin substrate is not particularly limited, and a known and conventional molding method can be used. Specifically, a single-layer or multi-layer T die or I die connected to a screw type extruder is used. Cast molding to extrude the molten resin into a sheet, calender molding, rolling molding, inflation molding, cast molding of a mixture of thermoplastic resin and organic solvent or oil or removal of solvent or oil after calender molding, thermoplastic resin Examples include molding from a solution and solvent removal.

  As a method of stretching the resin film, a known and conventional stretching method can be used, and longitudinal stretching using the peripheral speed difference of the roll group, lateral stretching using a tenter oven, rolling, and simultaneous two-stage by a combination of a tenter oven and a linear motor. Examples thereof include axial stretching. Here, the final stretching direction refers to the direction of stretching in the final stretching step among the stretching steps by these methods.

  The draw ratio at the time of extending | stretching is not specifically limited, According to the objective and the characteristic of resin to be used, it selects suitably. For example, when polypropylene or a copolymer thereof is used as the resin, it is about 1.2 to 12 times, preferably 2 to 10 times when stretched in one direction, and area magnification when biaxially stretched. 1.5 to 60 times, preferably 10 to 50 times. When using other thermoplastic resins, it is 1.2 to 10 times, preferably 2 to 5 times when stretched in one direction, and preferably 1.5 to 20 times by area magnification in the case of biaxial stretching. Is 4 to 12 times. Furthermore, heat treatment at a high temperature is performed as necessary.

  As the stretching temperature, when stretching an amorphous resin, the temperature range is higher than the glass transition temperature of the resin to be used. In the case of crystalline resin, the temperature is higher than the glass transition temperature of the amorphous part to the melting point of the crystalline part. It can carry out in the temperature range suitable for each resin, such as these temperature ranges. For example, when a thermoplastic resin is used, the temperature is 2 to 60 ° C. lower than the melting point of the resin. When the resin is a propylene homopolymer (melting point of 155 to 167 ° C.), 152 to 164 ° C., high density polyethylene (melting point) 121-134 ° C) and 110-120 ° C, and polyethylene terephthalate (melting point: 246-252 ° C) is 104-115 ° C. The stretching speed is 20 to 350 m / min.

  When the resin film used for the resin base material uses a polypropylene homopolymer and includes a transverse stretching process using a tenter oven, a heat setting zone is provided in the latter half, and the set temperature is made as high as possible, and the stretched polypropylene Increasing the temperature of the system film to the vicinity of its melting temperature in the highest case is effective in reducing the heat shrinkage rate. For this purpose, the set temperature of the heat setting zone can be variously selected depending on the line speed of the stretching process, the flow rate and flow rate of high-temperature air blown in the heat setting zone, the structure of the heat setting zone, etc. As a range of 158 to 165 ° C. When the thermoplastic resin film contains an inorganic fine powder or an organic filler, fine cracks are formed on the film surface, and fine pores are formed inside the film.

  The thickness of the resin base material used in the present invention is not particularly limited, but when used for a seal or a sticker, it is preferably 150 μm or less in order to suppress the resilience after sticking, It is especially preferable that it is -100micrometer.

[Resin laminate layer]
The resin laminate layer in the curved portion-attached pressure-sensitive adhesive sheet of the present invention can be a resin film that is usually used for laminating, for example, polyethylene terephthalate, polyethylene terephthalate / isophthalate copolymer, polyester such as polybutylene terephthalate, polyolefin such as polypropylene, etc. A resin film made of a material such as polyamide, polyimide resin, triacetyl cellulose, acrylic resin, or polyether sulfone can be used, or a laminate of these films can be used.

  The resin film for the laminate layer may be an unstretched film or a stretched film, and the production method is not limited, but a biaxially stretched film is preferable from the viewpoint of mechanical strength, dimensional stability, and transparency. The thickness of the resin film is not particularly limited, but a resin film having a thickness in the range of 5 to 200 μm is used in consideration of ease of handling, resistance to wrinkles, and economy.

  The laminate layer resin film may be subjected to various functional treatments such as barrier coating, easy-adhesion coating, antistatic coating, and ultraviolet shielding coating, and various vapor deposition treatments such as silica, alumina, and aluminum.

  Since the resin laminate layer is laminated in a state where the resin is pulled at the time of laminating, a shrinking force is applied in the laminating flow direction, and an extending force is applied in a direction orthogonal to the laminating flow direction. These forces are more prominent with time.

  The laminating method is not particularly limited, and a known laminating method such as dry laminating, non-solvent laminating, and extrusion laminating can be used. In the present invention, dry laminating is preferable. In the case of the dry laminating method, a laminating adhesive is applied to a resin film to be a resin laminating layer using a roll such as a gravure roll, and then the solvent is dried and a nip roll is immediately placed on the decorative layer of the resin substrate on which the decorative layer is provided. Paste together.

  In the case of bonding by nip roll, the nip roll can be heated to room temperature to 120 ° C. for bonding, but 40 to 100 ° C. is desirable.

[Decoration layer]
The decorative layer in the curved portion-attached pressure-sensitive adhesive sheet of the present invention is not particularly limited, but is preferably composed of an ink layer formed by various printing methods because it is easy to form.

  Various printing methods such as a lithographic printing method such as an offset printing method, an intaglio printing method such as a gravure printing method, a relief printing method such as a flexographic printing method, and a stencil printing method such as a silk screen printing method can be used.

[Adhesive layer]
As the pressure-sensitive adhesive used for the curved portion-attached pressure-sensitive adhesive sheet of the present invention, known acrylic, rubber-based, vinyl ether-based, and silicone-based pressure-sensitive adhesives can be used, among which a frequency of 1 Hz, −50 ° C. to Loss tangent of dynamic viscoelastic spectrum at 150 ° C. has (a) a convex peak upward at a low temperature range of −20 ° C. or lower, and (b) a convex peak downward at a medium temperature range of 10 to 40 ° C. And (c) a pressure-sensitive adhesive having a loss tangent at 70 ° C. of 0.38 to 0.57 is particularly preferred because it is excellent in removability and adhesiveness.

(Method for defining dynamic viscoelastic properties of adhesive layer)
The dynamic viscoelastic property of the pressure-sensitive adhesive used in the present invention is defined by the loss tangent of the dynamic viscoelastic spectrum or the loss tangent and the storage elastic modulus at a specific frequency and a specific temperature. It is defined by the temperature showing the peak of loss tangent in the viscoelastic spectrum or the peak value of loss tangent. In the measurement of dynamic viscoelasticity, using a viscoelasticity testing machine (Rheometrics, trade name: Ares 2KSTD), a test piece is sandwiched between parallel disks which are measuring parts of the testing machine, and the frequency is 1 Hz. The storage elastic modulus (G ′) and loss elastic modulus (G ″) from −50 ° C. to 150 ° C. are measured. For the test piece, an adhesive having a thickness of 0.5 to 2.5 mm is sandwiched between parallel disks. However, the laminate of the base material and the pressure-sensitive adhesive may be overlapped and sandwiched between parallel disks, and in the latter case, the thickness of the pressure-sensitive adhesive alone is adjusted to be in the above range. The present inventors have confirmed that when the thickness of the pressure-sensitive adhesive is adjusted to the above range, the dynamic viscoelastic spectrum of the pressure-sensitive adhesive is not affected even if the substrate is sandwiched between them.

  The pressure-sensitive adhesive used in the present invention has an upward convex peak in the low temperature range of −20 ° C. or lower, and the loss tangent in the range of −50 ° C. to 150 ° C. at a frequency of 1 Hz. It decreases, has a convex peak in the middle temperature range of 10 to 40 ° C., rises from the middle temperature range to the high temperature range, and takes a value within a specific range at 70 ° C.

  By setting the loss tangent to the above ranges, appropriate fluidity is imparted to the pressure-sensitive adhesive. Specifically, it does not flow excessively while exhibiting fluidity that can penetrate even fine irregularities on the surface of the adherend, so that an excessive increase in adhesive force can be suppressed. Furthermore, the stress which acts on an adhesive can be relieved by the property in which an adhesive flows moderately. As a result, in the operation of re-peeling the pressure-sensitive adhesive sheet adhered to the adherend after aging or exposure to a high temperature environment, the substrate to be peeled easily breaks, or the pressure-sensitive adhesive is attached to the adherend. It will not be easy to remain. Further, even when the pressure-sensitive adhesive sheet attached to the adherend is exposed to time or in a high temperature environment, the pressure-sensitive adhesive sheet is unlikely to be lifted off. Further, when the pressure-sensitive adhesive sheet is attached to a thermoplastic resin, even if outgas is generated from the thermoplastic resin, it is difficult for air bubble accumulation to occur between the pressure-sensitive adhesive sheet and the thermoplastic resin.

(Loss tangent of adhesive layer at high temperature)
The loss tangent in the high temperature range of 50 to 120 ° C. of the pressure-sensitive adhesive used in the present invention is 0.38 to 0.57 at 70 ° C. at a frequency of 1 Hz. The loss tangent at 70 ° C. is preferably 0.43 to 0.55, and more preferably 0.46 to 0.54. Moreover, the loss tangent at 50 ° C. is preferably 0.38 to 0.53, and more preferably 0.40 to 0.51. The loss tangent at 100 ° C. is preferably 0.40 to 0.65, more preferably 0.44 to 0.65, and particularly preferably 0.50 to 0.60. . Furthermore, the loss tangent at 120 ° C. is preferably 0.40 to 0.66, and more preferably 0.45 to 0.66. Especially, it is especially preferable that it is 0.51-0.62.

(Loss tangent of adhesive layer at medium temperature range)
The loss tangent of the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive used in the present invention has a downwardly convex peak between 10 ° C. and 60 ° C. at a frequency of 1 Hz. Furthermore, the peak value is preferably 0.35 to 0.51, and more preferably 0.4 to 0.51.

(Temperature showing a convex peak of loss tangent curve in low temperature range)
In the pressure-sensitive adhesive used in the present invention, the temperature at which the convex peak of the loss tangent curve is shown is preferably −20 ° C. or lower, more preferably −25 ° C. or lower, and −30 ° C. or lower at a frequency of 1 Hz. It is particularly preferred that Within this range, the pressure-sensitive adhesive layer is easy to flow sufficiently on an uneven surface such as an embossed surface at the time of sticking, and as a result, the adhesive force with the adherend is sufficient, and it is difficult for floating to occur with time. Further, when re-peeling, it is difficult to generate intermittent noise such as intermittent resistance or to make a peeling sound such as tingling, and a smooth peeling work can be performed.

(Convex peak value of loss tangent at low temperature)
The pressure-sensitive adhesive used in the present invention preferably has a loss tangent peak value of 1.3 to 1.0 or less.

(Storage elastic modulus of adhesive layer)
The pressure-sensitive adhesive used in the present invention preferably has a storage elastic modulus of 6.0 × 10 ^{4 to} 2.1 × 10 ⁵ (Pa) at 70 ° C. at a frequency of 1 Hz. Moreover, it is preferable that the storage elastic modulus in 50 degreeC is 7.0 * 10 < ⁴ > -2.4 * 10 < ⁵ > (Pa). Moreover, it is preferable that the storage elastic modulus in 100 degreeC is 3.0 * 10 < ⁴ > -1.6 * 10 < ⁵ > (Pa). Moreover, it is preferable that the storage elastic modulus in 120 degreeC is 2.0 * 10 < ⁴ > -1.4 * 10 < ⁵ > (Pa). Furthermore, the storage elastic modulus at −40 ° C. is preferably 5.0 × 10 ^{6 to} 5.0 × 10 ⁷ (Pa).

(Preparation of adhesive)
As the pressure-sensitive adhesive to be used in the curved portion-attached pressure-sensitive adhesive sheet of the present invention, known acrylic, rubber-based, vinyl ether-based, and silicone-based pressure-sensitive adhesives can be used, and among them, acrylic pressure-sensitive adhesives are preferable. . In particular, an acrylic copolymer containing a (meth) acrylic acid ester having a C 1-14 alkyl group as a monomer component is preferable. For example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) Examples thereof include acrylate and n-lauryl (meth) acrylate, and can be used alone or in combination of two or more. Among them, n-butyl acrylate, 2-ethylhexyl acrylate, or a monomer using them in combination is preferably a main component, and the amount used is preferably 50 to 99% by mass in the pressure-sensitive adhesive composition, 95 More preferably, it is -99% mass%. Furthermore, the mass ratio represented by (n-butyl acrylate / 2-ethylhexyl acrylate) is preferably 70/30 to 0/100, more preferably 45/55 to 5/95, More preferably, it is 65-15 / 85. By setting the type and amount used as the main monomer, it is easy to control the peak value that is convex above the loss tangent of the low temperature region in the dynamic viscoelastic spectrum to the target range.

  Furthermore, it is preferable to add a vinyl monomer having a functional group such as a hydroxyl group, a carboxyl group or an amino group in the side chain in the range of 0.01 to 15% by mass. For example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, crotonic acid, fumaric acid , Carboxypropyl acrylate maleate, dimethylaminoethyl acrylamide, N-vinyl pyrrolidone, acrylonitrile, N-vinyl caprolactam, acrylamide, styrene, vinyl acetate, N-methylol acrylamide, glycidyl methacrylate, etc. The above can be used in combination. Among them, it is preferable to use a vinyl monomer containing a carboxyl group, more preferably acrylic acid, methacrylic acid, or a monomer in combination thereof, and the amount used is 0.5. It is preferable that it is -4.0 mass%. In particular, it is preferable to use acrylic acid and methacrylic acid in combination in order to improve removability and adhesion to the curved portion. In particular, the total amount of acrylic acid and methacrylic acid is used in an amount of 1.5 to 2.5% by mass in the pressure-sensitive adhesive composition, and the ratio of methacrylic acid to acrylic acid is 0.5 to 2.0 by mass ratio. It is preferable to set it to 1.0 to 1.5. By making it into said kind and usage-amount as a carboxyl group-containing monomer, it becomes easy to control the loss tangent value in the said dynamic viscoelastic spectrum to the target range, and also re-peelability improves.

  The acrylic copolymer can be obtained by copolymerization by a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, an ultraviolet irradiation method, or an electron beam irradiation method. Of these, emulsion polymerization is preferred.

  Furthermore, it is preferable to add a crosslinking agent in order to increase the cohesive strength of the pressure-sensitive adhesive and improve the pressure-sensitive adhesive strength or removability. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a chelate crosslinking agent, and an oxazoline crosslinking agent. Among these, an oxazoline-based crosslinking agent is preferable. Furthermore, it is preferable to use acrylic acid and methacrylic acid as the monomer that reacts with the oxazoline group, and the functional group number ratio of the oxazoline group to the carboxyl group is 0.05 to 0.25. Moreover, in order to improve adhesive force, well-known tackifying resin can also be used.

  Moreover, well-known and usual additives, such as a light stabilizer, a ultraviolet absorber, a plasticizer, a softener, a filler, a pigment, a flame retardant, can be added to an adhesive, for example. Examples of the light stabilizer include a chain inhibitor, a hydroperoxide decomposing agent, a metal deactivator, and an ultraviolet absorber. By using such an additive, the above yellowing resistance can be improved.

(Adhesive type)
As the adhesive type, an emulsion type, a solvent type, a solventless type, or the like can be used. However, the adhesive used in the curved portion adhesive sheet of the present invention is an emulsion type adhesive. It is preferable. Emulsion-type pressure-sensitive adhesives are excellent from the environmental viewpoint because they do not use a solvent, and at the same time, it is easy to control the loss tangent of the high-temperature region in the dynamic viscoelastic spectrum within the target range.

(Preparation of acrylic emulsion type adhesive)
The production method of the acrylic emulsion-type pressure-sensitive adhesive in the present invention is not particularly limited, and a conventionally known method can be used. As the polymerization method, general batch polymerization, continuous dropping polymerization, divided dropping polymerization, or the like can be employed, and the polymerization temperature is, for example, about 20 to 100 ° C.

  An appropriate amount of an anionic or nonionic emulsifier is used in the emulsion polymerization to obtain an emulsion-type pressure-sensitive adhesive in order to ensure polymerization stability. The emulsifier is not particularly limited, and a known emulsifier can be used. Examples of the anionic emulsifier include sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and the nonionic emulsifier includes polyoxyethylene alkyl Examples include ether and polyoxyethylene alkylphenyl ether. The above emulsifiers can be used alone or in combination. In either anionic or nonionic type, for example, a radical polymerizable emulsifier into which a propenyl group or the like is introduced may be used.

  A polymerization initiator is used in emulsion polymerization to obtain an emulsion-type pressure-sensitive adhesive. Especially a polymerization initiator is not limited, A well-known polymerization initiator can be used. Specifically, 2,2′-azobis (2-methylpropionamidine) dihydrochloride, 4,4′-azobis (4-cyano) valeric acid, 2,2′-azobis (2-amidinopropane) dihydrochloride, etc. Redox initiators composed of peroxides such as azo, benzoyl peroxide, t-butyl hydroperoxide, hydrogen peroxide, combinations of persulfate and sodium bisulfite, and combinations of peroxide and sodium ascorbate Is used. These initiators may usually be added in a predetermined amount to each stage of emulsion polymerization to cause the polymerization reaction.

  Among them, it is desirable to use an initiator that generates a carbon radical, and it is preferable to use an azo-based initiator. Carbon radicals are poor in dehydrogenation power, making it difficult for the grafting of the polymer to proceed and making it easier to obtain a linear polymer. As a result, the peak value convex under the loss tangent in the high temperature region and the loss tangent in the medium temperature region in the dynamic viscoelastic spectrum can be easily controlled within the target range.

  A reducing agent is used in emulsion polymerization to obtain an emulsion-type pressure-sensitive adhesive. Examples of reducing agents include reducing organic compounds such as ascorbic acid, tartaric acid, citric acid, glucose, and formaldehyde sulfoxylate metal salts, and reducing inorganic compounds such as sodium thiosulfate, sodium sulfite, sodium bisulfite, and sodium metabisulfite. It is done.

  A chain transfer agent can be used to adjust the degree of polymerization in emulsion polymerization for obtaining an emulsion-type pressure-sensitive adhesive. Examples of such chain transfer agents include lauryl mercaptan, butyl mercaptan, 2-mercaptoethanol, trichlorobromomethane, and the like, and at least one selected from these groups can be used. In particular, when an acrylic monomer is used as the monomer component, 0.01 to 0.2 parts by mass of lauryl mercaptan, more preferably 0.000 parts by mass with respect to 100 parts by mass of the acrylic monomer. It is preferable to blend 01 to 0.04 parts by mass, more preferably 0.015 to 0.025 parts by mass.

  In emulsion polymerization to obtain an emulsion-type pressure-sensitive adhesive, after emulsion polymerization, a neutral emulsion is usually neutralized using a neutralizing agent such as ammonia, and adjusted to a predetermined pH, whereby a stable emulsion-type pressure-sensitive adhesive is obtained. can get. Especially, it is preferable that it is the range of pH 8.5-9.5.

(Adhesive layer thickness)
The thickness of the pressure-sensitive adhesive layer used in the pressure-sensitive adhesive sheet of the present invention is preferably 3 to 200 μm, more preferably 5 to 50 μm, and particularly preferably 10 to 25 μm after drying. Adhesiveness of the curved part-attached pressure-sensitive adhesive sheet obtained when it is at least the above lower limit value can be sufficiently obtained, and when it is at most the upper limit value, it is difficult for the adhesive to stick out during printing or die cutting.

(Adhesive force)
The pressure-sensitive adhesive layer used in the sheet for bonding a curved portion of the present invention is preferably a pressure-sensitive adhesive layer having a pressure-sensitive adhesive force of 1 to 15 (N / 25 mm), and the pressure-sensitive adhesive force is 2 to 14 (N / 25 mm) is more preferable. In addition, the adhesive strength is 23 ± 2 ° C. and relative humidity is 50 ± 5% of a SUS304 steel plate polished with water-resistant abrasive paper with a test piece pasted with a press speed of 5 mm / s and a reciprocation frequency of 1 reciprocation according to JIS Z0237. It is a value measured under a condition of a pulling speed of 180 mm / min in the direction of a peeling angle of 180 degrees after being left in the atmosphere for 1 hour.

[Curved part adhesive sheet]
The curved-section-adhered pressure-sensitive adhesive sheet of the present invention has the above-described layers, and the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to the object to be applied are substantially orthogonal directions. The pressure-sensitive adhesive sheet is preferably a laminate in which the final stretching direction of the resin base material and the tension application direction during lamination of the resin laminate layer are laminated in a substantially parallel direction.

  Since the direction orthogonal to the final stretching process direction of the resin base material is a highly flexible direction in the curved portion pasting adhesive sheet of the present invention, the decorative layer is curved when pasting the direction and the object to be pasted. By laminating each layer so that the direction is the same direction, it is possible to realize a curved part pressure-sensitive adhesive sheet that can suitably follow the curved part.

  Moreover, in this invention, it is preferable to have the structure where the final extending process direction of the said resin base material and the tension application direction at the time of the lamination process of the said resin laminate layer were laminated | stacked on the substantially parallel direction. In the lamination process in a normal manufacturing process, the resin base material produced in roll shape etc. is sent out one by one, and the resin film for lamination which applied the tension | tensile_strength in this manufacturing flow direction is laminated | stacked. A resin base material made of a biaxially stretched resin film produced in a roll shape is generally stretched in the production flow direction, and then stretched in the width direction perpendicular to this and biaxially stretched. High flexibility in the direction orthogonal to the stretching process direction. For this reason, in the normal manufacturing process, the direction perpendicular to the highly flexible final stretching process is the same as the direction in which the tension is applied during lamination, and the pressure-sensitive adhesive sheet warps in a concave shape due to shrinkage of the surface laminate layer. Produce. On the other hand, in the preferred embodiment of the present invention, the surface of the laminate layer becomes concave because the direction of the final stretching process having low flexibility in the resin base material is the same direction as the direction in which the resin laminate layer tends to shrink. Force can be suppressed. Furthermore, the direction perpendicular to the final stretching process direction of the highly flexible resin base material is the same direction as the direction in which the resin laminate layer is to be stretched, so that the obtained curved part-attached pressure-sensitive adhesive sheet is convex on the laminate layer side. Since the curl is appropriately generated, the curved portion can be suitably followed.

  Hereinafter, preferred embodiments of the curved part-attached pressure-sensitive adhesive sheet of the present invention will be described. As an example of the layer structure of the curved portion pressure-sensitive adhesive sheet of the present invention, a decorative layer is provided on one surface of the resin base material, the laminate layer is provided on the decorative layer, and the decorative layer of the resin base material is provided. The structure which has an adhesive layer in the surface opposite to a surface is mentioned (FIG. 4).

  As described above, the curved portion-attached pressure-sensitive adhesive sheet of the present invention is characterized by combining the directions of the respective layers in a specific direction. Specifically, as shown in FIG. 5, when the curved portion-attached pressure-sensitive adhesive sheet having the configuration is placed on a plane, when the b-axis direction is the final stretching direction of the resin base material, The configuration is such that the tension application direction during laminating is the same as the b-axis direction.

  Furthermore, the direction in which the decorative layer is provided is required to provide the decorative layer so that the direction in which the curved portion-attached adhesive sheet of the present invention is bent coincides with the a-axis direction when being applied to the object to be applied. . For example, when the object to be pasted is curved in the left-right direction and the curved portion pasted adhesive sheet is curved and pasted in the left-right direction (FIG. 6), the curved left-right direction and a of the curved portion pasted adhesive sheet It is necessary to provide a target decorative layer so that the axis is in the same direction. Specifically, the decorative layer is provided so that the a-axis can be visually recognized as the left-right direction and the b-axis as the up-down direction. In addition, in the case where the curved portion adhesive sheet is attached while being bent in the vertical direction, the decorative layer is provided so that the vertical direction of bending and the a axis of the curved portion adhesive sheet are in the same direction. Specifically, the decorative layer is provided so that the a-axis can be viewed vertically and the b-axis can be viewed horizontally.

  In a pressure-sensitive adhesive sheet provided with a decorative layer such as a printed layer, the laminate layer is provided on the surface layer side that is usually visually recognized. Since the resin laminate layer is usually laminated on the base material or the base material on which other layers are laminated while applying tension (tension) to the resin film, the resin laminate layer is in the tension application direction (tension direction). A contraction force is generated in the film, and an extension force acts in a direction perpendicular to the contraction force. For this reason, the pressure-sensitive adhesive sheet curls with time due to the shrinkage force of the laminate layer, and the pressure-sensitive adhesive sheet may be peeled off from the object to be applied.

  On the other hand, the curved part-attached pressure-sensitive adhesive sheet according to the present invention can control the curl of the pressure-sensitive adhesive sheet by controlling the directionality of the resin base material and the resin laminate layer, and further preferably has a decorative layer for the directionality. By arranging with a good directionality, the shrinkage force and elongation force of the laminate layer are controlled. That is, in the direction orthogonal to the final stretching direction of the resin base material, the laminate layer is flexibly caused by the stretching force of the laminate layer so that the laminate layer side is convex, and in the final stretching direction of the resin base material, the laminate is laminated. By suppressing curling that the laminate layer side becomes concave due to the shrinkage of the layer, a pressure-sensitive adhesive sheet that is extremely suitable for sticking to a curved part to be pasted, particularly a curved part curved in a uniaxial direction, has been realized. is there.

  The shape and size of the curved part-attached adhesive sheet of the present invention are not particularly limited, but when the repulsive force is large, such as when the axial length in the direction of following the curved part is short, or the notch part is easily peeled off. This is particularly effective in the case of a shape having many end portions. For example, when the short axis direction of a rectangular-shaped curved part-attached adhesive sheet having a long axis and a short axis is made to follow a curved part curved in a uniaxial direction with a curvature radius of 1 to 3 cm, the length in the short axis direction is 4. Excellent peel resistance can be achieved even when the thickness is 5 to 5 cm.

  Even if it is a case where it sticks to a curved part, the curved part sticking adhesive sheet of this invention can implement | achieve the outstanding peeling resistance, without using a special strong adhesion adhesive as an adhesive layer. Further, since it is not necessary to use a strong adhesive, it has excellent removability and hardly causes adhesive residue even when peeled. Therefore, the curved part-attached pressure-sensitive adhesive sheet of the present invention can be suitably used as a sticker or a sticker that is attached to articles of various shapes having a curved part. In particular, since the direction in which curl occurs over time is the direction following the curved portion, it can be suitably used as a campaign sticker for vending machines installed in an outside air environment (FIG. 7).

[Production method]
In the method for producing a curved portion-attached pressure-sensitive adhesive sheet of the present invention, at least (1) a step of providing a pressure-sensitive adhesive layer on one surface of the resin substrate;
(2) The surface having the pressure-sensitive adhesive layer of the resin base material and the other surface so that the final stretching direction of the resin base material and the direction in which the decoration layer is curved when pasted on the object to be applied are substantially orthogonal to each other. Laminating a decorative layer,
And have.

  And (3) a step of laminating the resin laminate layer on the resin base layer provided with the decorative layer by applying a tension to the laminating resin film in a direction substantially parallel to the final stretching direction of the resin base material. It can manufacture suitably by the method which has.

  In the step (1), the method for providing the pressure-sensitive adhesive on the back surface of the resin substrate having the decorative layer is not particularly limited, and a known method can be adopted. For example, a direct gravure coater, a Meyer bar coater, a reverse roll coater, an air knife coater, an offset gravure coater, and a multi-stage roll coater can be used.

  Moreover, you may provide release paper in the obtained adhesive layer.

  In the step (2), the resin laminate layer is stretched by providing the decorative layer on the resin base material so that the final stretching direction and the direction in which the decorative layer is curved are substantially orthogonal to each other. And the direction in which the decorative layer curves is the same direction, and the pressure-sensitive adhesive sheet suitably follows the curved portion.

  The method for forming the decorative layer is not particularly limited, and includes a planographic printing method such as an offset printing method, an intaglio printing method such as a gravure printing method, a relief printing method such as a flexographic printing method, and a stencil printing method such as a silk screen printing method. It can be formed by various printing methods.

  In the step (3), a tension is applied to the laminating resin film on the resin base material having the decorative layer obtained in the step (2) in a direction substantially parallel to the final stretching direction of the resin base material. Laminate. By laminating in this direction, shrinkage of the laminate layer can be suppressed by making the direction of low flexibility, which is the direction orthogonal to the final stretching direction of the resin base material, and the direction in which the laminate layer shrinks the same direction.

  The lamination conditions of the resin laminate layer can be performed under general lamination conditions. The tension applied to the resin film for laminating may be within a normal range, and may be appropriately adjusted so that wrinkles do not enter the sheet surface after lamination.

[Attaching method]
In the present invention, as a suitable method of sticking the adhesive sheet,
A sticking method for sticking an adhesive sheet to an object to be attached having a curved portion that is curved in a uniaxial direction, comprising at least a resin base material, an adhesive layer, and a resin laminate layer, and one surface of the resin base material The pressure-sensitive adhesive layer is provided, and the resin laminate layer is provided on the other surface of the resin base material, and the final stretching direction of the resin base material and tension application during the lamination process of the resin laminate layer are provided. The pressure-sensitive adhesive sheet whose direction is substantially parallel is pasted so that the final stretching direction of the resin base material and the direction of bending of the object to be pasted having a curved portion curved in a uniaxial direction are substantially orthogonal to each other. The method can be suitably applied to the curved surface.

  According to this method, the direction orthogonal to the final stretching direction of the resin base material suitably follows the curved surface to be pasted, and the peeling of the pressure-sensitive adhesive sheet can be suppressed.

[Production method of resin base material]
From the extruder, the polypropylene resin composition was melted at a T-die temperature of 240 ° C. and coextruded, and quenched with a mirror cooling roll having a surface temperature of 30 ° C. to obtain an unstretched film. The obtained unstretched sheet was guided to a longitudinal stretching machine, stretched 5 times in the longitudinal direction at a temperature of 140 ° C. between heating rolls, and then stretched 8 times in the lateral direction at a temperature in the tenter of 160 to 210 ° C. A resin substrate made of an axially stretched film was obtained.

[Method for producing adhesive]
40 parts of deionized water was put into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, and the temperature was raised to 75 ° C. while blowing nitrogen. Under stirring, latemul E-118B (manufactured by Kao Corporation, emulsifier for emulsion polymerization) 0.8 part, potassium persulfate 0.1 part was added, followed by 46 parts 2-ethylhexyl acrylate, 42 parts butyl acrylate, Part of a monomer pre-emulsion emulsified by adding 4.0 parts latemul E-118B and 15 parts deionized water to a monomer mixture consisting of 2 parts methacrylic acid and 1.0 part lauryl mercaptan as a chain transfer agent (4 Part) was added, and polymerization was carried out for 60 minutes while maintaining the temperature in the reaction vessel at 75 ° C. Subsequently, while maintaining the temperature in the reaction vessel at 75 ° C., 10 parts of the remaining monomer pre-emulsion and potassium persulfate aqueous solution (active ingredient 1%) and 10 parts of L-ascorbic acid aqueous solution (active ingredient 0.5%) were added. Using separate dropping funnels, polymerization was carried out by dropping dropwise over 240 minutes while maintaining the temperature in the reaction vessel at 75 ° C. After completion of dropping, the contents were stirred for 180 minutes at the same temperature to cool the contents. Then, it adjusted with ammonia water (10% of active ingredients) so that pH might be set to 8.0, and the aqueous dispersion liquid of pH 8.0 was obtained. After adding 2.0 parts of oxazoline-based crosslinking agent Epocross K-2020E (manufactured by Nippon Shokubai Co., Ltd.) to the aqueous dispersion, the mixture was filtered through a 100-mesh wire mesh to obtain an adhesive.

Obtained [Method for Producing Resin Base Material with Adhesive Layer]
Adhesive is applied to a release sheet (trade name OKB-105NC, manufactured by Oji Paper Co., Ltd.) coated with a silicone compound on polyethylene laminated paper, and dried at 80 ° C. for 90 seconds, and a dry weight of 20 g / m ² is obtained. A layer was obtained. Subsequently, the said resin base material was bonded together on this adhesive layer surface, and it left still in an atmosphere of 40 degreeC for 2 days, and obtained the resin base material with an adhesive layer.

  The obtained resin base material with the pressure-sensitive adhesive layer was attached to a stainless steel plate 304 with a pressure bonding speed of 5 mm / s and a number of times of pressure bonding, and left in an atmosphere of 23 ± 2 ° C. and relative humidity of 50 ± 5% for 1 hour. When the adhesive force of the pressure-sensitive adhesive sheet was measured under the condition where the peeling angle was 180 degrees and the pulling speed was 180 mm / min, the adhesive force was 7 N / 25 mm.

[Production method of resin laminate substrate]
From the extruder, the polypropylene resin composition was melted at a T-die temperature of 240 ° C. and coextruded, and quenched with a mirror cooling roll having a surface temperature of 30 ° C. to obtain an unstretched film. The obtained unstretched sheet was guided to a longitudinal stretching machine and stretched 5 times in the longitudinal direction at a temperature of 140 ° C. between heating rolls, and then stretched 8 times in the lateral direction at a temperature in the tenter of 160 to 210 ° C. A resin laminate substrate made of an axially stretched film was obtained.

[Example 1]
A sheet-fed offset printing machine (on the surface having the pressure-sensitive adhesive layer of the resin base material with the pressure-sensitive adhesive layer) so that the direction in which the decoration layer is curved is orthogonal to the final stretching direction of the resin base material ( Dick Manroland Co., Ltd. ROLAND 500) is used to form a decorative layer, and the resin laminate base material is applied on the decorative layer by dry laminating, and tension is applied in the same direction as the final stretching direction of the resin base material. Then, dry lamination was performed to obtain a laminated sheet. From the obtained laminated sheet, a rectangular sheet having a length of 5 cm in the direction of curving the decorative layer and a length of 30 cm in a direction perpendicular to the direction was cut out to obtain a pressure-sensitive adhesive sheet with a curved portion.

[Example 2]
A curved portion-adhered pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that a tension was applied to the resin laminate substrate in a direction perpendicular to the final stretching direction of the resin substrate and dry lamination was performed.

[Comparative Example 1]
A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that the decorative layer was formed by offset printing so that the direction in which the decorative layer was curved was perpendicular to the final stretching direction of the resin substrate.

[Comparative Example 2]
A pressure-sensitive adhesive sheet was obtained in the same manner as in Comparative Example 1 except that a tension was applied to the resin laminate substrate in a direction orthogonal to the final stretching direction of the resin substrate and dry lamination was performed by the dry lamination method.

[Measurement of adhesive strength]
In accordance with JIS Z0237, for each of the curved portion pasting sheets obtained in Examples 1 and 2 and the pressure sensitive adhesive sheets obtained in Comparative Examples 1 and 2, a test piece was attached at a crimping speed of 5 mm / s and the number of times of crimping was one reciprocation. The stuck stainless steel 304 steel plate is left in an atmosphere of 23 ± 2 ° C. and relative humidity of 50 ± 5% for 1 hour, and then the adhesive strength of the adhesive sheet is measured under the condition of a pulling speed of 180 mm / min in the direction of the peeling angle of 180 degrees. did. N / 25mm

[Peeling test]
A stainless steel plate 30 cm long x 15 cm wide x 3 mm thick coated with melamine on the surface is curved only in the horizontal axis direction so that the angle between adjacent flat plate portions is 90 °, and the radius of curvature outside the curved portion ( The radius of curvature at the intersection of the outer straight line of the adjacent flat plate part in the cross-sectional shape and the line forming 45 ° and the outside of the curved portion is measured in a range of 65 ° centered on the intersection. Was obtained (FIG. 8). The curved part paste sheet obtained in Examples 1 and 2 and the pressure sensitive adhesive sheet obtained in Comparative Examples 1 and 2 having a width of 2 cm from the end in the minor axis direction of the pressure sensitive adhesive sheet are applied to the curved part to be adhered. Affixed to the curved portion (FIG. 9), left in an environment of a temperature of 23 ° C. and a relative humidity of 50% RH for 24 hours, the peeled state was observed, and evaluated according to the following criteria.
A: The pressure-sensitive adhesive sheet does not float or peel off.
○: Slight lifting is seen in the curved part, but peeling of the adhesive sheet does not occur.
X: Peeling occurs on the adhesive sheet.

  As shown in Table 1, the curved part-adhered pressure-sensitive adhesive sheet of the present invention of Example 1 suitably follows the curved surface, and does not float or peel off without using a strong adhesive. It was. Further, in the curved part-attached pressure-sensitive adhesive sheet of Example 2, although a slight lifting of about 2 mm occurred in the curved part, the lifting of the end part of the pressure-sensitive adhesive sheet and the peeling of the pressure-sensitive adhesive sheet did not occur. On the other hand, the adhesive sheets of Comparative Examples 1 and 2 were peeled off at the affixed part of the curved part leaving the affixed part of the flat plate part.

It is a figure showing the aspect which affixes the curved part sticking adhesive sheet of this invention to the to-be-pasted object which has the corner part curved in circular arc shape. It is a figure showing the aspect which affixes the curved part sticking adhesive sheet of this invention to the to-be-pasted object which has a corner part with two corner | angular parts. It is a figure showing the aspect which affixes the curved part sticking adhesive sheet of this invention to the to-be-pasted object which has a corner part with one corner | angular part. It is a figure showing an example of the laminated constitution of the curved part sticking adhesive sheet of this invention. It is a top view of the curved part sticking adhesive sheet of the present invention. It is a figure showing the aspect which curves and sticks the curved part sticking adhesive sheet of this invention to the left-right direction. It is a figure showing the aspect which affixes the curved part sticking adhesive sheet of this invention to a vending machine. It is a figure showing the outline | summary of the deposition object used in the Example of this invention. It is a figure showing the sticking aspect in the Example of the curved part sticking adhesive sheet of this invention.

Explanation of symbols

1: Curved portion-attached pressure-sensitive adhesive sheet 2: Application target 3: Laminate layer 4: Decoration layer 5: Resin substrate 6: Adhesive layer

Claims (10)

A curved portion pasting adhesive sheet to be stuck to a curved portion of a subject to be pasted having a curved portion curved in a uniaxial direction,
Having at least a resin substrate, an adhesive layer, a decorative layer, and a resin laminate layer,
The resin substrate is made of a biaxially stretched resin film,
The pressure-sensitive adhesive layer is provided on one surface of the resin base material, and the decoration layer and the resin laminate layer are provided on the other surface of the resin base material,
A curved portion-adhered pressure-sensitive adhesive sheet, characterized in that the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to an object to be applied are substantially orthogonal directions. 2. The curved portion-attached pressure-sensitive adhesive sheet according to claim 1, wherein a final stretching direction of the resin base material and a tension application direction at the time of laminating the resin laminate layer are substantially parallel directions. The said resin laminate layer consists of a biaxially stretched resin film.
The adhesive sheet with a curved surface as described in 1. The curved portion-attached pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein an elastic modulus in a direction orthogonal to the final stretching direction of the resin base material is 0.1 to 5. In accordance with JIS Z0237, a pressure-sensitive adhesive sheet is pasted on a SUS304 steel plate polished with water-resistant abrasive paper with a crimping speed of 5 mm / s and with one round of crimping, and in an atmosphere of 23 ± 2 ° C. and relative humidity of 50 ± 5% for 1 hour. 5. The curved portion sticking according to claim 1, wherein the adhesive strength is 1 to 15 N / 25 mm when peeled at a pulling speed of 180 mm / min in the direction of a peeling angle of 180 mm after being left. Adhesive sheet. The loss tangent of the dynamic viscoelastic spectrum at a frequency of 1 Hz and −50 ° C. to 150 ° C. of the pressure-sensitive adhesive layer is
(A) has a convex peak upward in a low temperature range of −20 ° C. or lower,
(B) has a convex peak in the middle temperature range of 10 to 40 ° C.,
(C) Loss tangent at 70 ° C. is 0.38 to 0.57
The bending part sticking adhesive sheet according to any one of claims 1 to 4. The loss tangent of the pressure-sensitive adhesive layer in a high temperature range of 50 to 120 ° C. is 0.38 to 0.53 at 50 ° C., 0.40 to 0.65 at 100 ° C., and 0 at 120 ° C. It is 40-0.66, The curved part sticking adhesive sheet of Claim 6. A curved portion sticking adhesive that has a resin base material composed of at least a biaxially stretched resin film, an adhesive layer, a decorative layer, and a resin laminate layer, and is attached to a curved portion of an object to be pasted that has a curved portion that is curved in a uniaxial direction. A sheet manufacturing method comprising:
Providing an adhesive layer on one surface of the resin substrate;
The decorative layer is provided on the surface having the pressure-sensitive adhesive layer and the other surface of the resin base material so that the final stretching direction of the resin base material and the direction in which the decorative layer curves when being applied to the object to be applied are substantially orthogonal. Laminating process,
The manufacturing method of the curved part sticking adhesive sheet characterized by having these. The method further comprises the step of laminating the resin laminate layer on the resin substrate decor layer provided with the decor layer by applying a tension to the laminating resin film in a direction substantially parallel to the final stretching direction of the resin substrate. The manufacturing method of the adhesive part adhesive sheet | seat of bending part of 8. A sticking method for sticking an adhesive sheet to an object to be pasted having a curved portion curved in a uniaxial direction,
Having a resin base material composed of at least a biaxially stretched resin film, an adhesive layer, and a resin laminate layer;
The pressure-sensitive adhesive sheet provided with the pressure-sensitive adhesive layer on one surface of the resin base material and the resin laminate layer on the other surface of the resin base material is uniaxially aligned with the final stretching direction of the resin base material. A sticking method of an adhesive sheet, wherein sticking is performed so that a direction in which an object to be pasted having a curved portion curved in a direction is orthogonal.

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