JP6170608B1 - Adhesive film - Google Patents

Abstract

[PROBLEMS] To provide an adhesive film that is excellent in winding property when a thin adhesive film is processed by a roll-to-roll method, and that is excellent in design properties. . The pressure-sensitive adhesive film includes a release film, a pressure-sensitive adhesive layer, a resin film, and a roughened layer. The pressure-sensitive adhesive layer is provided on the surface of the release film. The resin film is provided on the surface of the pressure-sensitive adhesive layer on the side opposite to the release film. The roughening layer is provided on the surface of the resin film opposite to the pressure-sensitive adhesive layer. The average height (Rc) of the roughness curve element of the structure surface of the roughened layer is 0.5 μm or more. The dynamic friction coefficient of the structural surface with respect to the release film is 2 or less. [Selection] Figure 1

Description

  The present invention relates to an adhesive film.

  In small electronic products such as mobile phones and notebook personal computers, a heat-dissipating graphite sheet is used to promote heat dissipation of electronic components provided inside. Graphite sheets used in these small electronic products are very thin in order to make the electronic products thin and improve heat dissipation. Therefore, in the graphite sheet, the sheet surface is protected with a colored adhesive tape in order to prevent the chipping, peeling, and the like (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, as an adhesive tape used for protecting a graphite sheet, a resin film layer having a thickness of 1 μm to 6 μm, an adhesive layer having a thickness of 1 μm to 6 μm, and a thickness of 0.5 μm There is a pressure-sensitive adhesive layer on at least one surface of a colored substrate having a colored layer of 2 μm or less, the light transmittance of the colored substrate is from 0.1% to 10%, and the thickness of the tape is from 3 μm to 10 μm. The following colored adhesive tape is disclosed.

  Patent Document 2 discloses a colored pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on at least one surface of a colored film provided with a colored layer made of colored ink on a support, as a pressure-sensitive adhesive tape used for protecting a graphite sheet, It is disclosed that the colored layer is made of a colored ink containing a binder resin, a coloring material, and silica particles having a specific average particle size.

  The colored adhesive tape includes, for example, an adhesive layer, a resin film provided on the adhesive layer, and a colored layer provided on the resin film. The resin film is, for example, a base material for an adhesive film. And a colored layer functions as a shielding layer which makes the spot on the external appearance of a graphite sheet inconspicuous, for example. This colored adhesive tape is also required to be thin, and the thickness of the tape is as thin as 10 μm or less. Such a colored adhesive tape is formed by, for example, a roll-to-roll method together with a release film. In the roll-to-roll method, a colored adhesive tape with a release film (hereinafter, this state is referred to as an adhesive film) is wound around a take-up roll.

  Thereafter, the adhesive film is cut into a predetermined width by a roll-to-roll method and used as a protective tape for protecting the graphite sheet. When manufacturing such a very thin adhesive film by the roll-to-roll method, at the time of winding, winding such as blocking (attachment between the film surface and the film back surface in contact therewith), air biting (based on the heel), etc. There was a case in which a take-off occurred. In recent years, from the viewpoint of aesthetics, the adhesive film is also required to have a design that appears to be integrated when placed inside an electronic product.

JP 2013-203965 A JP 2013-112695 A

  In view of the circumstances as described above, an object of the present invention is to provide a pressure-sensitive adhesive film that is excellent in winding property when a thin pressure-sensitive adhesive film is processed by a roll-to-roll method, and that is excellent in design.

In order to achieve the above object, an adhesive film according to an embodiment of the present invention is an adhesive film that protects a graphite sheet. The pressure-sensitive adhesive film includes a release film, a pressure-sensitive adhesive layer, a resin film, and a roughened layer. The pressure-sensitive adhesive layer is provided on the surface of the release film. The resin film is provided on the surface of the pressure-sensitive adhesive layer on the side opposite to the release film. The roughening layer is provided on the surface of the resin film opposite to the pressure-sensitive adhesive layer. The average height (Rc) of the roughness curve element of the structure surface of the roughened layer is 0.5 μm or more, and the dynamic friction coefficient of the structure surface with respect to the release film is 2 or less.
According to such an adhesive film, even when wound on a take-up roll, the adhesive film is less likely to cause blocking and air biting, and is suitable for winding when a thin adhesive film is processed by a roll-to-roll method. Excellent design characteristics.

In the above-mentioned pressure-sensitive adhesive film, the roughened layer may contain particles and a binder resin.
In the above adhesive film, the 60 ° specular glossiness may be 0.5% or more and 50% or less on the structural surface.
Moreover, in said adhesive film, a coloring agent may be contained in at least one of the said adhesive layer, the said resin film, and the said roughening layer.
Moreover, in said adhesive film, 1 micrometer or more and 5 micrometers or less may be sufficient as the thickness of the said adhesive layer.
Moreover, in said adhesive film, the thickness of the said resin film may be 1 micrometer or more and 6 micrometers or less.
Moreover, in said adhesive film, the thickness of the said roughening layer may be 0.5 micrometer or more and 10 micrometers or less.
Moreover, in said adhesive film, 0.5 or more and 1.5 or less may be sufficient as the dynamic friction coefficient with respect to the said peeling film of the said structural surface.
Moreover, in said adhesive film, 0.1 or more and 1.0 micrometer or less may be sufficient as arithmetic mean roughness (Ra) of the said structural surface.
Moreover, in said adhesive film, 0.5 micrometer or more and 5.0 micrometers or less may be sufficient as the average height (Rc) of the roughness curve element of the said structural surface.
Moreover, in said adhesive film, 1.0 micrometer or more and 9.0 micrometers or less may be sufficient as 10-point average roughness (Rzjis) of the said structural surface.
Moreover, in said adhesive film, 500 nm or less may be sufficient as the average height (Rc) of the roughness curve element of the lower surface of the said peeling film.
Moreover, in said adhesive film, 40 mass parts or more and 150 mass parts or less may be sufficient as content of the said particle | grain in the said roughening layer with respect to 100 mass parts of binder resin.
Moreover, in said adhesive film, the said roughening layer may contain a coloring agent.
Moreover, said adhesive film may be comprised by the elongate sheet form.
Moreover, in said adhesive film, the said adhesive layer, the said resin film, and the said roughening layer may be affixed on the surface of the graphite sheet installed in the inside of an electronic component.
According to such a pressure-sensitive adhesive film, the pressure-sensitive adhesive film is less likely to cause blocking and air biting, and is excellent in winding suitability when the thin pressure-sensitive adhesive film is processed by a roll-to-roll method, and also in design.

  As described above, according to the present invention, there is provided an adhesive film that has excellent winding suitability when a thin adhesive film is processed by a roll-to-roll method, and is excellent in design.

FIG. 1A is a schematic three-dimensional view of a state in which the pressure-sensitive adhesive film according to this embodiment is wound. FIG. (B) is a schematic sectional drawing of the adhesive film which concerns on this embodiment. It is a schematic sectional drawing of the state where the graphite sheet with an adhesive tape concerning this embodiment was stuck to the case via a double-sided tape. It is the schematic explaining the manufacturing process of the adhesive film which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, XYZ axis coordinates may be introduced.

  [Configuration of adhesive film]

  FIG. 1A is a schematic three-dimensional view of a state in which the pressure-sensitive adhesive film according to this embodiment is wound. FIG.1 (b) is a schematic sectional drawing of the adhesive film which concerns on this embodiment.

  As shown to Fig.1 (a), the adhesive film 2 which concerns on this embodiment is comprised by the elongate sheet form. The adhesive film 2 is a flexible resin tape that can be wound in a uniaxial direction. For example, in the example of FIG. 1A, the adhesive film 2 is wound around a winding roll (winding core) 310 in the longitudinal direction DL. The length (full length) in the longitudinal direction DL of the adhesive film 2 wound around the take-up roll 310 is, for example, 6000 m or more and 10000 m or less. The length of the adhesive film 2 in the width direction DW (short direction) orthogonal to the long direction DL is, for example, not less than 800 mm and not more than 1500 mm.

  The adhesive film 2 wound around the take-up roll 310 is formed by, for example, a roll-to-roll method. The adhesive film 2 wound around the take-up roll 310 is cut into a predetermined width by a roll-to-roll method, and then cut into a predetermined shape to protect, for example, a graphite sheet installed inside an electronic component. Used as protective tape. For example, the adhesive film 2 wound around the take-up roll 310 may be cut into, for example, every 100 mm width in the width direction DW and divided into a plurality of pieces. The divided adhesive film 2 may be wound again on another winding roll. In the drawing of this embodiment, the width direction DW is the X-axis direction, and the long direction DL is the Y-axis direction.

The cross-sectional structure of the adhesive film 2 will be described below.
As shown in FIG. 1B, the adhesive film 2 includes a resin film 11, a roughened layer 15, an adhesive layer 20, and a release film 30. In the example of FIG. 1B, the adhesive film 2 is laminated in the order of release film 30 / adhesive layer 20 / resin film 11 / roughened layer 15. In the present embodiment, the release film 30 side may be the lower side, and the roughened layer 15 side may be the upper side.

  In the adhesive film 2, the release film 30 can be peeled off from the interface between the release film 30 and the adhesive layer 20. In this embodiment, a configuration in which the release film 30 is peeled off from the adhesive film 2 is referred to as an adhesive tape 1. The pressure-sensitive adhesive tape 1 includes a resin film 11, a roughened layer 15, and a pressure-sensitive adhesive layer 20.

  The release film 30 is provided on the surface of the pressure-sensitive adhesive layer 20 on the side opposite to the resin film 11. In the example of FIG. 1B, the release film 30 is the lowest layer. The pressure-sensitive adhesive layer 20 is provided on the surface opposite to the lower surface 30 d of the release film 30. The pressure-sensitive adhesive layer 20 is provided between the release film 30 and the resin film 11. The resin film 11 is provided on the surface of the pressure-sensitive adhesive layer 20 on the side opposite to the release film 30. The resin film 11 is provided between the roughened layer 15 and the pressure-sensitive adhesive layer 20. The resin film 11 is a base material for the adhesive film 2. The roughening layer 15 is provided on the surface of the resin film 11 opposite to the pressure-sensitive adhesive layer 20.

  The roughening layer 15 is the uppermost layer in the example of FIG. When the adhesive film 2 is wound around the take-up roll 310, the upper surface 15u (structural surface) of the roughened layer 15 is in contact with the surface (lower surface 30d) opposite to the adhesive layer 20 of the release film 30. become.

  The arithmetic average roughness Ra of the upper surface 15u (structural surface) of the roughened layer 15 is not particularly limited, but is preferably 0.1 μm or more, more preferably 0.1 μm or more and 1.0 μm or less, Preferably, it is 0.2 μm or more and 0.5 μm or less. The average height Rc of the roughness curve element of the roughened layer 15 is 0.5 μm or more, preferably 0.5 μm or more and 5.0 μm or less, more preferably 0.8 μm or more and 3.0 μm or less. More preferably, it is 1.0 μm or more and 2.0 μm or less. The 10-point average roughness Rzjis of the roughened layer 15 is not particularly limited, but is preferably 1.0 μm or more, more preferably 1.0 μm or more and 9.0 μm or less, and further preferably 2.0 μm or more. It is 7.0 μm or less, and particularly preferably 2.5 μm or more and 5.0 μm or less.

  When the roughened layer 15 has a structural surface in the above range, a dynamic friction coefficient described later can be set to a predetermined range. As a result, even when the adhesive film 2 is wound around the take-up roll 310, the adhesive film 2 is less likely to cause blocking and air biting, and the thin adhesive film 2 is wound when being processed by the roll-to-roll method. Excellent aptitude. Further, since the roughened layer 15 has a structural surface in the above range, the 60 ° specular glossiness of the upper surface 15u of the roughened layer 15 described later can be set within a predetermined range. Thereby, the design property when the graphite sheet 100 with which the adhesive film 2 was affixed is installed in the inside of an electronic component is excellent.

  For example, the dynamic friction coefficient with respect to the lower surface 30d of the release film 30 on the upper surface 15u of the roughened layer 15 is 2 or less, preferably 1.8 or less, and more preferably 1.5 or less. Although the minimum of a dynamic friction coefficient is not specifically limited, Preferably, it is 0.5 or more, More preferably, it is 1 or more. When the dynamic friction coefficient exceeds 2, when the adhesive film 2 is wound around the take-up roll 310, blocking or air biting may occur. Moreover, when the dynamic friction coefficient is less than 0.5, when the adhesive film 2 is wound around the take-up roll 310, there is a possibility that winding deviation may occur.

  Further, the 60 ° specular glossiness of the upper surface 15u of the roughened layer 15 having such roughness is not particularly limited, but is preferably 0.5% or more and 50% or less, more preferably 1% or more. It is 9% or less, more preferably 1% or more and 5% or less. Thereby, in the graphite sheet 100 with the adhesive film 2 attached, the appearance is matte, and the adhesive tape 1 is integrated with the electronic component when the adhesive tape 1 is installed inside the electronic component. Since it looks like, the design property is excellent.

  In the adhesive film 2, the layers adjacent to each other in the Z-axis direction may be in direct contact with each other or indirectly in contact with each other. In the case of indirect contact, an intermediate layer (not shown) that improves adhesion and the like may be interposed between layers adjacent in the Z-axis direction. Moreover, each layer in the adhesive film 2 may be a single layer or may be composed of a plurality of layers. In the adhesive film 2, a colored layer (not shown) may be provided between the roughened layer 15 and the resin film 11.

  In the adhesive film 2, the thickness of the release film 30 is not particularly limited, but is preferably 20 μm or more and 80 μm or less, and more preferably 20 or more and 30 μm or less. Here, the thickness in the present embodiment is an average value of thicknesses measured from a plurality of points described later.

  Although the thickness of the adhesive layer 20 is not specifically limited, Preferably, they are 1 micrometer or more and 5 micrometers or less, More preferably, they are 1 micrometer or more and 3 micrometers or less. When the thickness of the pressure-sensitive adhesive layer 20 is less than 1 μm, the adhesion between the pressure-sensitive adhesive layer 20 and the graphite sheet is low, and it may be difficult to sufficiently protect the graphite sheet. When the thickness of the pressure-sensitive adhesive layer 20 exceeds 5 μm, the pressure-sensitive adhesive film 2 becomes thick and does not satisfy the demand for thinning.

  The thickness of the resin film 11 is, for example, 1 μm or more and 6 μm or less, and preferably 1 μm or more and 3 μm or less. When the thickness of the resin film 11 is less than 1 μm, the strength of the resin film 11 becomes low, and it becomes difficult to convey the film by a roll-to-roll method. When the thickness of the resin film 11 exceeds 6 μm, the pressure-sensitive adhesive film 2 becomes thick and does not satisfy the demand for thinning.

  The thickness of the roughened layer 15 is, for example, from 0.5 μm to 10 μm, preferably from 0.6 μm to 3.0 μm, and more preferably from 0.8 μm to 2.0 μm. When the thickness of the roughened layer 15 is less than 0.5 μm, a desired structural surface cannot be obtained, and when the thickness of the roughened layer 15 exceeds 10 μm, the pressure-sensitive adhesive film 2 becomes thick and satisfies the demand for thinning. Absent.

  By setting the thickness of each layer within the above range, the thickness of the pressure-sensitive adhesive tape 1 after the release film 30 is peeled is about 10 μm, and the pressure-sensitive adhesive tape 1 is configured to be extremely thin.

  FIG. 2 is a schematic cross-sectional view of a state in which a graphite sheet with an adhesive tape according to this embodiment is attached to a housing via a double-sided tape.

  As shown in FIG. 2, the adhesive tape 1 from which the release film 30 has been peeled is attached to, for example, a graphite sheet 100. For example, the exposed surface of the pressure-sensitive adhesive layer 20 of the pressure-sensitive adhesive tape 1 is bonded to the surface of the graphite sheet 100. Moreover, the graphite sheet 100 is affixed on the housing | casing 102 (for example, electronic component) via the double-sided tape 101. FIG. Thereby, in the graphite sheet 100, heat is diffused also in the Z-axis direction, the X-axis direction, and the Y-axis direction. Thereby, the heat generated from the electronic component is efficiently radiated.

  Moreover, since the adhesive tape 1 is ultra-thin, it can be arrange | positioned in an electronic product, without harming the internal space of a small electronic product. Furthermore, since the roughened layer 15 is provided on the adhesive tape 1, it looks like a matte tone. Thereby, since it seems that the adhesive tape 1 is integrated with the electronic component (it seems to melt | dissolve), the adhesive tape 1 is not conspicuous and the design property is also improving.

  Further, in order to make the appearance of the graphite sheet 100 inconspicuous, the pressure-sensitive adhesive tape 1 has at least one of the pressure-sensitive adhesive layer 20, the resin film 11 and the roughened layer 15 for the purpose of imparting shielding properties. May contain a colorant, and a colored layer may be provided separately from the pressure-sensitive adhesive layer 20, the resin film 11 and the roughened layer 15. The colorant is not particularly limited, and examples thereof include carbon black, titanium oxide, calcium carbonate, barium sulfate, yellow iron oxide, red pepper, cyanine blue, aluminum powder, and mica titanium powder. Thereby, the spot on the external appearance of the graphite sheet 100 becomes inconspicuous, and the external appearance of the graphite sheet 100 is further improved. That is, the design property when the graphite sheet 100 with the adhesive film 2 attached is installed inside an electronic component is further improved.

  The material of each layer in the pressure-sensitive adhesive film 2 and the method of measuring the physical property values are as follows.

[Resin film]
The type of resin used for the resin film is not particularly limited. For example, polyester film made of polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyurethane film, polyethylene film, polypropylene film Cellulose film such as triacetyl cellulose, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, acrylic resin film, norbornene resin film, cycloolefin resin Examples of the resin film such as a film; and a laminate of two or more of these. The resin film may be uniaxially stretched or biaxially stretched. Among these, a polyester film is preferable from the viewpoints of thickness accuracy, surface smoothness, availability, and the like required as the film thickness is reduced. As the polyester film, a PET film is particularly preferable. The polyester film is preferably a biaxially stretched film from the viewpoint of dimensional stability and strength. Among these, a biaxially stretched PET film is preferable.

[Colored layer]
The colored layer is not particularly limited as long as it is colored in a color that matches or matches the color of the electronic component to which the colored adhesive tape is applied, but makes the spots on the appearance of the graphite sheet inconspicuous, From the viewpoint of imparting design properties, black is preferable.

  The colored layer preferably contains a coloring material and a binder resin. Examples of the binder resin include a urethane resin, an epoxy resin, a polyester resin, and a polyester urethane resin. These may be used alone or in combination of two or more. Among these, from the viewpoint of excellent flexibility, the binder resin is preferably at least one of a polyester resin and a polyester urethane resin, and more preferably a polyester urethane resin, from the viewpoint of adhesion to the roughened layer. The binder resin preferably has a glass transition temperature (Tg) of −30 to 10 ° C. from the viewpoint of adhesion to the roughened layer.

  The colored layer is preferably cured by a curing agent. A hardening | curing agent is not specifically limited, According to binder resin, it selects suitably. When the binder resin is a polyester urethane resin, examples of the curing agent include an isocyanate curing agent. In addition, when a hydroxyl group or an isocyanate group exists in the polyester urethane resin, an amine curing agent may be used as the curing agent. These may be used alone or in combination of two or more.

  As the coloring material, known and commonly used pigments and dyes can be used. If the colored layer is black, for example, carbon black, if white, titanium oxide, calcium carbonate, barium sulfate, if yellow, yellow iron oxide, if red, brown, if blue, cyanine blue, if silver Examples include aluminum powder and mica titanium powder in the case of pearl. Among these, carbon black is preferable because of its excellent concealability. The content of the coloring material in the coloring layer is not particularly limited, and can be appropriately set according to the target concealing property. For example, the colored layer preferably includes a binder resin and a coloring material of 10 parts by mass or more and 70 parts by mass or less with respect to 100 parts by weight of the binder resin. If the content of the coloring material exceeds 70 parts by mass, the adhesion with the roughened layer may be lowered, which is not preferable. A commercial item can also be used for the said coloring material, As a commercial item of a black coloring material, UTCO-591 black (made by Dainichi Seika Co., Ltd.) etc. are mention | raise | lifted, for example.

  The colored layer may further contain additives such as a transparent resin (medium), an antioxidant, an ultraviolet absorber, and a light stabilizer as necessary. The thickness of the colored layer is, for example, from 0.5 μm to 10 μm, and preferably from 0.8 μm to 3 μm.

[Adhesive layer]
The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer of the colored pressure-sensitive adhesive tape is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, and styrene-diene. It can be appropriately selected from known adhesives such as block copolymer adhesives. An adhesive can be used individually or in combination of 2 or more types.

  As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive can be preferably used because it has high adhesion reliability. The acrylic pressure-sensitive adhesive has an acrylic polymer as a pressure-sensitive adhesive component or main ingredient and, as necessary, an appropriate agent such as a crosslinking agent, a tackifier, a softener, a plasticizer, a filler, an anti-aging agent, or a colorant. Additives are included. Acrylic polymer is a polymer that has (meth) acrylic acid alkyl ester as the main component of monomer and can be copolymerized with (meth) alkyl ester as needed (copolymerizable monomer) Body). Examples of the (meth) acrylic acid alkyl ester include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, (meth) Isobutyl acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-Methylhexyl acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate , Dodecyl (meth) acrylate, tridecyl (meth) acrylate, (me ) Tetradecyl acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, eicosyl (meth) acrylate (meta) ) Acrylic acid C1-20 alkyl ester [preferably (meth) acrylic acid C4-18 alkyl (linear or branched alkyl) ester] and the like. The (meth) acrylic acid alkyl ester can be appropriately selected according to the intended tackiness and the like.

  Examples of the copolymerizable monomer copolymerizable with the (meth) alkyl ester include carboxyl groups such as (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid. -Containing monomers or anhydrides thereof; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; aromatic vinyl compounds such as styrene and substituted styrene; cyano group-containing monomers such as acrylonitrile; ethylene, propylene, butadiene, etc. Olefins; vinyl esters such as vinyl acetate; vinyl chloride; amide group-containing monomers such as acrylamide, methacrylamide, N-vinylpyrrolidone, N, N-dimethyl (meth) acrylamide; hydroxyalkyl (meth) acrylate Contains hydroxyl groups such as glycerin dimethacrylate Monomers; amino group-containing monomers such as aminoethyl (meth) acrylate and (meth) acryloylmorpholine; imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; glycidyl (meth) acrylate and (meth) acrylic Epoxy group-containing monomers such as methyl glycidyl acid; isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate, triethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, ethylene glycol di (meta ) Acrylate, tetraethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, Pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, polyfunctional copolymerizable monomers such as divinylbenzene (multifunctional monomer) and the like. A copolymerizable monomer can be used individually or in combination of 2 or more types. As the copolymerizable monomer, a modifying monomer having a functional group such as a hydroxyl group or a carboxyl group can be suitably used.

  The (meth) acrylic acid alkyl ester copolymer preferably contains 0.1 to 20% by mass, and particularly preferably 1 to 10% by mass, of a modifying monomer having a functional group.

  The weight average molecular weight of the (meth) acrylic acid alkyl ester copolymer is preferably 200,000 to 2,000,000, particularly preferably 500,000 to 1,500,000. In addition, the weight average molecular weight in this specification is the value of polystyrene conversion measured by the gel permeation chromatography (GPC) method.

  As a crosslinking agent, what is necessary is just to react with the functional group which a (meth) acrylic-acid alkylester copolymer has, for example, an isocyanate type crosslinking agent, an epoxy-type crosslinking agent, an amine type crosslinking agent, a melamine type crosslinking agent, Examples include aziridine-based crosslinking agents, hydrazine-based crosslinking agents, aldehyde-based crosslinking agents, oxazoline-based crosslinking agents, metal alkoxide-based crosslinking agents, metal chelate-based crosslinking agents, metal salt-based crosslinking agents, and ammonium salt-based crosslinking agents. And an isocyanate-based cross-linking agent excellent in reactivity with a carboxyl group. A crosslinking agent can be used individually by 1 type or in combination of 2 or more types.

  The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, and the like. And biuret bodies, isocyanurate bodies, and adduct bodies that are a reaction product with a low molecular active hydrogen-containing compound such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, and the like. Among them, trimethylolpropane-modified aromatic polyisocyanate is preferable in terms of reactivity with the reactive group of the (meth) acrylic acid alkyl ester polymer. DOO, especially trimethylolpropane modified xylylene diisocyanate and trimethylolpropane-modified tolylene diisocyanate is preferable.

  It is preferable that the compounding quantity of a crosslinking agent is 0.1-20 mass parts with respect to 100 mass parts of (meth) acrylic-acid alkylester copolymers, and it is especially preferable that it is 1-10 mass parts. When the blending amount of the crosslinking agent is within the above range, the gel fraction of the pressure-sensitive adhesive described later can be easily controlled within a preferable range.

  Moreover, in order to improve the adhesive force of an adhesive layer, it is also preferable to add tackifying resin. In addition, by adding these tackifying resins, it is possible to increase the tensile strength and tensile rupture strength, so depending on the acrylic copolymer used, by appropriately adding a tackifying resin, the tensile strength and The tensile breaking strength can be adjusted. Examples of the tackifier resin added to the adhesive layer of the double-sided colored adhesive tape of the present invention include rosin resins such as rosin and rosin ester compounds; terpene polymers such as diterpene polymers and α-pinene-phenol copolymers Resins; Petroleum resins such as aliphatic (C5) and aromatic (C9); and styrene resins, phenolic resins, xylene resins, and the like. Among them, in the pressure-sensitive adhesive composition using an acrylic copolymer containing n-butyl (meth) acrylate as a main monomer component, a rosin-based resin and a styrene-based resin can be used in order to achieve both thin and adhesive strength and heat resistance. Are preferably used in combination.

  In addition, the pressure-sensitive adhesive layer may be a silane coupling agent, an antistatic agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a softening agent, a filler, a refractive index adjusting agent, a dye, a pigment, a rust inhibitor, etc. It may contain.

[Peeling film]
The release film preferably has a film substrate and a release agent layer provided on the film substrate. As film base materials, polyester films made of polyester such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyolefin films made of polyolefin such as polyethylene, polypropylene, polymethylpentene, plastic films such as polycarbonate film, polyvinyl acetate film, etc. Or a laminate composed of two or more of these material layers.

  The release agent layer is formed of, for example, a cured product of a release agent layer forming composition containing a release agent. The release agent layer forming composition is not particularly limited as long as it can provide the release agent layer with a function of releasing any layer laminated on the release agent layer from the release film. Examples of the release agent include silicone resins, long chain alkyl resins, and alkyd resins.

  Examples of the silicone release agent include addition reaction type silicone, condensation reaction type silicone, and energy ray curable silicone. In order to adjust the peeling force, non-functional polydimethylsiloxane, phenyl-modified silicone, silicone resin, silica, or cellulose compound may be used as an additive.

  When the adhesive film 2 is wound around the take-up roll 310, the upper surface 15u (structural surface) of the roughened layer 15 is in contact with the surface (lower surface 30d) opposite to the adhesive layer 20 of the release film 30. become. For this reason, the arithmetic average roughness Ra of the lower surface 30d of the release film 30 is preferably 50 nm or less, and more preferably 40 nm or less. The lower limit of Ra of the lower surface 30d is not particularly limited, but is preferably 10 nm. The average height Rc of the roughness curve element on the lower surface 30d is not particularly limited, but is preferably 500 nm or less, and more preferably 450 nm or less. The lower limit of Rc of the lower surface 30d is not particularly limited, but is preferably 100 nm. The 10-point average roughness Rzjis of the lower surface 30d is not particularly limited, but is preferably 800 nm or less, more preferably 700 nm or less. The lower limit of Rzjis of the lower surface 30d is not particularly limited, but is preferably 100 nm.

  By setting Ra, Rc and Rzjis on the lower surface 30d of the release film 30 within the above range, the dynamic friction coefficient with the roughened layer 15 can be set within a desired range. Thereby, even when the upper surface 15u of the roughened layer 15 is in contact with the lower surface 30d of the release film 30 when the adhesive film 2 is wound on the take-up roll 310, Ra, Rc and the lower surface 30d of the release film 30 Since Rzjis is set in the above range, the adhesive film 2 is less likely to cause blocking and air biting, and is excellent in winding property when the thin adhesive film 2 is processed by the roll-to-roll method.

[Roughening layer]
The material of the roughened layer is not particularly limited as long as the arithmetic average roughness Ra of the upper surface (structural surface), the average height Rc of the roughness curve element, and the 10-point average roughness Rzjis are in desired ranges. As a method for adjusting Ra, Rc, and Rzjis of the upper surface 15u, the above-described roughness and the like can be adjusted by a roughening method, a method including a layer containing at least one of inorganic particles and organic particles, and the like. Examples of the surface roughening treatment include a corona discharge treatment method, a sand blast treatment, a method in which a rough roll surface is pressure-bonded to the upper surface, and the roughness of the roll surface is transferred. Moreover, the said roughness etc. can also be adjusted by making a roughening layer contain particle | grains.

Among these, it is preferable that the roughened layer contains particles and a binder resin.
It is more preferable that at least one of inorganic particles and organic particles is included, and it is more preferable that inorganic particles and a binder resin are included. The roughness and the like can be easily adjusted by adjusting the average particle diameter, blending amount, and the like of the inorganic particles and / or organic particles. The average particle diameter of the inorganic particles and / or organic particles may be larger than the thickness of the roughened layer.

  The binder resin is not particularly limited, and examples thereof include a thermoplastic resin, a thermosetting resin, and a photocurable resin, and examples thereof include a urethane resin, an epoxy resin, a polyester resin, and a polyester urethane resin. These may be used alone or in combination of two or more. Among them, a thermoplastic resin is preferable because of excellent flexibility, and a urethane resin, a polyester resin, and a polyester urethane resin are preferable. In the case where the roughened layer contains particles, the binder resin is more preferably at least one of a polyester resin and a polyester urethane resin from the viewpoint of compatibility.

  The roughening layer may be cured with a curing agent. A hardening | curing agent is not specifically limited, According to binder resin, it selects suitably. When the binder resin is a polyester urethane resin, examples of the curing agent include an isocyanate curing agent. In addition, when a hydroxyl group or an isocyanate group exists in the polyester urethane resin, an amine curing agent may be used as the curing agent. These may be used alone or in combination of two or more. In addition, the roughened layer may contain additives such as an antioxidant, an ultraviolet absorber, and a light stabilizer, if necessary, in the same manner as that contained in the colored layer.

[particle]
The organic particles are not particularly limited, and examples thereof include acrylic resin particles such as polymethyl methacrylate particles, polystyrene particles, polycarbonate particles, urethane resin beads, epoxy resin beads, polyester resin beads, and polyester urethane resin beads. These may be used alone or in combination of two or more.

The inorganic particles are not particularly limited, and examples thereof include at least one of particles such as silica (SiO ₂ ), barium sulfate (BaSO ₄ ), titanium oxide, and calcium carbonate. These may be used alone or in combination of two or more. Among these, silica, barium sulfate (BaSO ₄ ), or a blend of silica and barium sulfate (BaSO ₄ ) is preferable because of easy particle size adjustment and availability.

  The volume ratio of silica to barium sulfate ([silica volume]: [barium sulfate volume]) is preferably in the range of 100: 50 to 100: 500. The content of the particles is not particularly limited, but is preferably 40 parts by mass or more and 150 parts by mass or less, more preferably 50 parts by mass or more and 140 parts by mass or less, and 60 parts by mass or more with respect to 100 parts by mass of the binder resin. 130 parts by mass or less is more preferable, and 80 parts by mass or more and 125 parts by mass or less is particularly preferable. When the particle content is less than 40 parts by mass with respect to 100 parts by mass of the binder resin, the dynamic friction coefficient of the upper surface 15u of the roughened layer 15 with respect to the lower surface 30d of the release film 30 exceeds 2, and the roughened layer 15 The 60 ° specular gloss may exceed 50%.

  In the roughened layer 15, inorganic particles and organic particles may be mixed. Inorganic particles or organic particles may be exposed on the upper surface 15 u of the roughened layer 15.

  The average particle size of the particles is not particularly limited, but is preferably 0.5 or more and 10 μm or less, more preferably 1 μm or more and 5 μm or less, and further preferably 1.5 μm or more and 3.0 μm or less. When the average particle diameter is outside the above range, it is not preferable because it is difficult to adjust the average height (Rc) of the desired roughness curve element.

  Further, in the pressure-sensitive adhesive film 2, when at least one kind of silica and barium sulfate particles is dispersed in the roughened layer 15, the mixing ratio of the silica particles and the barium sulfate particles in the roughened layer 15 is changed. Thereby, the selection range of the color of the roughening layer 15 can be expanded. For example, when the content of the barium sulfate particles is relatively increased, the blue color of the roughened layer 15 becomes stronger. Further, the 60 ° specular gloss of the roughened layer 15 can be lowered by relatively reducing the content of barium sulfate particles. That is, by changing the mixing ratio of the silica particles and the barium sulfate particles, the selection range of the color on the appearance in the graphite sheet 100 can be further expanded. Moreover, the selection range of the appearance of the graphite sheet 100 to which the adhesive film 2 is stuck can be further expanded.

  Further, when the particles are dispersed in the roughened layer 15, the upper surface of the roughened layer 15 when the adhesive film 2 is wound around the take-up roller 310 or when the adhesive film 2 is transferred. Damage such as scratches is less likely to enter 15u. Thereby, the productivity of the adhesive film 2 is further improved.

[Average particle size measurement]
The average particle diameter of the particles is measured by a Coulter counter method. For example, the peak top value measured by the Coulter counter method is used as the average particle size.

[Measurement of thickness]
Although it does not specifically limit about the thickness measurement of each layer of the adhesive film 2, A well-known thickness meter can be used, for example, a film thickness meter (Nikon Corporation film thickness meter Digimicro MH-15M) is used.

  [Method for producing adhesive film]

  Although the manufacturing process of the adhesive film which concerns on this embodiment is demonstrated below, it is not limited to this. FIG. 3A and FIG. 3B are schematic views for explaining the production process of the adhesive film according to this embodiment. In this embodiment, the adhesive film 2 is manufactured by a roll-to-roll method. The adhesive film 2 is manufactured in the atmosphere, for example. An arrow DR in the figure indicates the traveling direction of the film. The traveling direction DR corresponds to the long direction DL.

  As shown in FIG. 3A, the release film 30 is continuously unwound from the unwinding roll 211 by the rotation of the unwinding roll 211, and is guided to the coating mechanism 220 through the guide roll 250a. A release agent layer is formed on the surface of the release film 30 (the surface on which the pressure-sensitive adhesive layer 20 is formed).

  The application mechanism 220 applies the coating liquid for the pressure-sensitive adhesive layer 20 onto the release film 30 that is fed from the unwinding roll 211. The release film 30 with the pressure-sensitive adhesive layer 20 is guided to the drying chamber 230 through the guide roll 250b, and is dried at a predetermined temperature, for example, for 10 seconds to 5 minutes. Thereby, the peeling film 51 with an adhesive layer which has the peeling film 30 and the adhesive layer 20 is formed. The release film 51 with the pressure-sensitive adhesive layer is guided to the pasting mechanism 240 through the guide roll 250c.

  The resin film 11 is attached to the adhesive layer 20 of the release film 51 with the adhesive layer guided to the attaching mechanism 240 by the attaching mechanism 240. For example, the release film 51 with the pressure-sensitive adhesive layer is sandwiched between the roll 240b and the roll 240c, and the resin film 11 is fed out between the roll 240b and the roll 240c from the unwinding roll 240a.

  Thereby, the resin film 11 is bonded together to the adhesive layer 20, and the adhesive film 52 which has the peeling film 30, the adhesive layer 20, and the resin film 11 is formed. Thereafter, the adhesive film 52 is continuously wound around the winding roll 210 via the guide roll 250d.

  Subsequently, as shown in FIG. 3B, the adhesive film 52 wound around the unwinding roll 311 is continuously unwound by the rotation of the unwinding roll 311 and is applied to the coating mechanism 320 via the guide roll 350a. Led. The coating liquid for the roughened layer 15 is applied to the resin film 11 by the coating mechanism 320.

  The adhesive film 52 to which the coating liquid for the roughening layer 15 is applied is guided to the drying chamber 330 through the guide roll 350b and dried at a predetermined temperature. Thereby, the adhesive film 2 in which the roughened layer 15 is provided on the resin film 11 of the adhesive film 52 is formed. And the adhesive film 2 is continuously wound up by the winding roll 310 via the guide roll 350c. In addition, in the adhesive film 2, when a colored layer is provided between the roughening layer 15 and the resin film 11, a colored layer is formed between FIG. 3 (a) and FIG.3 (b). A process may be provided.

  In addition, as a coating method in the coating mechanism 220 and the coating mechanism 320, for example, any method such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, or a gravure coating method may be applied. Good.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

  [Example 1]

<Preparation of adhesive composition>
By copolymerizing 95.5 parts by weight of butyl acrylate, 3 parts by weight of vinyl acetate, 1 part by weight of 2-hydroxyethyl acrylate, and 0.5 parts by weight of acrylic acid, an acrylic having a weight average molecular weight of 1,000,000 is obtained. An acid ester copolymer is produced. Next, 25 parts by mass of hydrogenated rosin ester (Arakawa Chemical Industries, Pine Crystal KE-100, softening point: 100 ° C.) with respect to 100 parts by mass of this acrylic acid ester copolymer (in terms of solid content; the same applies hereinafter). 4 parts by mass of polymerized rosin ester (Arakawa Chemical Industries, Pencel D-135, softening point: 135 ° C.) and 24 parts by mass of petroleum resin (Mitsui Chemicals, FTR 6100, softening point: 95 ° C.) are added. By further mixing, an adhesive component was formed. The adhesive component was dissolved in toluene to prepare an adhesive solution having a solid content concentration of 13% by mass.

<Preparation of coating solution A for roughening layer>
The coating solution A for the roughening layer was prepared by using silica fine particles (NIPSIL SS50B, manufactured by Tosoh Silica Co., Ltd., average particle size 2) with respect to 100 parts by mass (converted to solid content) of polyester resin (Toyobo: Byron 20SS) as a binder resin. 22 parts by mass of 1 μm), 100 parts by mass of barium sulfate fine particles (manufactured by Sakai Chemical Industry Co., Ltd .: BMH, average particle size 2.5 μm), and a toluene / methyl ethyl ketone (MEK) mixed solvent (toluene: MEK (mass ratio)) = 50:50), the solid content concentration was adjusted to 20% by mass.

<Manufacture of adhesive film>
Release film (SP-PET251130 manufactured by Lintec Co., Ra of the lower surface 30d of the release film: 34 nm, Rc: 400 nm, Rzjis: 672 nm, thickness: 25 μm) from which one side of the polyethylene terephthalate film was released with a silicone release agent Then, after the coating solution of the adhesive composition was applied with a knife coater so that the thickness after drying was 2 μm, the obtained coating film was heated at 90 ° C. for 1 minute. An adhesive layer having a thickness of 2 μm was formed on the release film. Thereafter, a polyethylene terephthalate film (Toray, ET2F51L, thickness 2 μm) as a resin film was bonded to the exposed surface side of the coating layer, and the obtained adhesive film was wound into a roll.

  Next, the pressure-sensitive adhesive film wound up in a roll shape is cured for 7 days under the conditions of 23 ° C. and 50% RH, so that the release film / pressure-sensitive adhesive layer (thickness: 2 μm) / resin film (thickness: 2 μm) An adhesive film was produced.

  Subsequently, the adhesive film wound in a roll shape is drawn out, and a black ink (manufactured by Dainichi Seika Co., Ltd., “UTCO-591 Black (NX)”) is applied to the resin film surface by a gravure coater, and further heated. A colored layer having a thickness of 1 μm was formed on the adhesive film. Then, the obtained colored adhesive film was wound up in a roll shape.

  Next, a colored adhesive film wound in a roll shape is unwound, and is obtained after the roughened layer coating solution A is applied to the colored layer surface with a gravure coater so that the thickness after drying becomes 1 μm. The coated film was heat-treated at 90 ° C. for 1 minute to form a roughened layer having a thickness of 1 μm. Then, the obtained colored adhesive film was wound up in a roll shape.

  [Example 2]

  An adhesive film was obtained in the same manner as in Example 1 except that the colored layer was not provided.

  [Example 3]

  An adhesive film was obtained in the same manner as in Example 2 except that carbon black was added as a colorant to the coating solution for the roughened layer in an amount of 25 wt% based on the total amount of the binder resin and the solid content of the colorant.

  [Example 4]

  A pressure-sensitive adhesive film was obtained in the same manner as in Example 1 except that the coating solution B for roughening layer was used.

<Preparation of coating solution B for roughening layer>
The coating solution B for the roughening layer is composed of silica fine particles (manufactured by Tosoh Silica Co., Ltd., NIPSIL SS50B, average particle size 2) with respect to 100 parts by mass (in terms of solid content) of a polyester resin (Toyobo: Byron 20SS) as a binder resin. 1 μm) was added, and the solid content concentration was adjusted to 20 mass% with a toluene / methyl ethyl ketone (MEK) mixed solvent (toluene: MEK (mass ratio) = 50: 50).

  [Example 5]

  As a release film, a release film manufactured by Lintec Co., Ltd. SP-PET381130 on one side of a polyethylene terephthalate film with a silicone release agent, Ra: 29 nm, Rc: 320 nm, Rzjis: 666 nm, thickness 38 μm on the lower surface 30d of the release film) An adhesive film was obtained in the same manner as in Example 1 except that it was used.

  [Comparative Example 1]

  An adhesive film was obtained in the same manner as in Example 1 except that the roughened layer was not formed.

[Surface roughness measurement]
Average height Rc, arithmetic average roughness Ra, and 10-point average roughness of the surface of the roughened layer, the surface of the colored layer, and the surface of the release film opposite to the pressure-sensitive adhesive layer (lower surface 30d). Rzjis was measured according to JIS B 0601-2001 using a contact-type surface roughness meter (product name “SV3000S4” manufactured by Mitutoyo Corporation).

  [60 ° specular gloss]

  The 60 ° specular glossiness of the surface of the roughened layer or the colored layer was measured according to JIS K 7105 using a gloss meter “VG7000” manufactured by Nippon Denshoku Industries Co., Ltd.

  [Dynamic friction coefficient measurement]

  In accordance with JIS K7125, the dynamic friction coefficient between the roughened layer surface or the colored layer of the pressure-sensitive adhesive film and the surface (lower surface 30d) opposite to the pressure-sensitive adhesive layer of the release film was measured. The load was 200 g, and a precision universal testing machine Autograph AG-IS (Shimadzu Corporation) was used for measurement.

[Measurement of thickness of each layer]
The thickness of the resin film, the release film, and each layer was measured by a simple digital side length system (manufactured by Nikon Corporation, trade name “Digimicro MH-15M”).

  Table 1 shows the structures of the adhesive films in Examples 1 to 5 and Comparative Example 1, Table 2 shows the surface roughness of the roughened layers of the adhesive films in Examples 1 to 5 and Comparative Example 1, and the surface roughness of the colored layers. The surface roughness of the pressure-sensitive adhesive film, the dynamic friction coefficient of the roughened layer or the colored layer with respect to the release film, the 60 ° specular gloss of the structure surface of the pressure-sensitive adhesive film, the winding property of the pressure-sensitive adhesive film, and the design evaluation of the pressure-sensitive adhesive film .

  [Evaluation of winding aptitude]

In each step, the presence or absence of blocking when winding in a roll shape and the presence or absence of air biting (based on wrinkles) were visually observed, and winding suitability was evaluated according to the following criteria. Here, in the winding suitability in Table 2, A and B are:
A: There is no occurrence of blocking and air biting, and the winding property is stable.
B: A range where blocking or air biting occurs and may cause a practical problem.
Means that.

  [Design evaluation]

  The adhesive film from which the release film was peeled off was bonded to a Selen graphite sheet “SGS-025-APH” and cut into a size of 50 mm × 50 mm to prepare an evaluation sample. The surface of the adhesive film of this sample was visually observed under a fluorescent lamp and evaluated according to the following criteria. The visual observation was performed on five subjects and was comprehensively judged. Here, in the design evaluation in Table 2, A and B are:

A: The shine or glare on the adhesive film surface was hardly visually recognized, and the design was good.
B: The shine or glare of the adhesive film surface was visually recognized, and the designability was impaired.
Means that.

  As shown in Table 2, in Examples 1 to 5, the Rc of the roughened layer as the uppermost layer is 0.5 μm or more, and the dynamic friction coefficient of the roughened layer with respect to the release film is 2 or less. . In this case, the winding suitability was “A”. On the other hand, in Comparative Example 1, the Rc of the uppermost colored layer is 0.33 μm, which is smaller than 0.5 μm, and the dynamic friction coefficient of the colored layer with respect to the release film exceeds 2 and is 2.4. In this case, the winding suitability was “B”.

  In Examples 1 to 5, the 60 ° specular gloss is 0.5% or more and 50% or less. In this case, the design evaluation was “A”. On the other hand, in Comparative Example 1, the 60 ° specular gloss was 63.9%, exceeding 50%. In this case, the design evaluation was “B”.

  As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, Of course, a various change can be added.

DESCRIPTION OF SYMBOLS 1 ... Adhesive tape 2 ... Adhesive film 11 ... Resin film 15 ... Roughening layer 15u ... Upper surface 20 ... Adhesive layer 30 ... Release film 30d ... Lower surface 51 ... Release film with an adhesive layer 52 ... Adhesive film 100 ... Graphite sheet 101 ... Double-sided tape 102 ... Housing 210 ... Winding roll 211 ... Unwinding roll 220 ... Application mechanism 230 ... Drying chamber 240 ... Pasting mechanism 240a ... Unwinding roll 240b ... Roll 240c ... Roll 250a, 250b, 250c, 250d ... Guide roll 310 ... Winding roll 311 ... Unwinding roll 320 ... Coating mechanism 330 ... Drying chamber 350a, 350b, 350c ... Guide roll

Claims (14)

An adhesive film that protects the graphite sheet,
A release film having an upper surface and a lower surface opposite to the upper surface, wherein an average height (Rc) of roughness curve elements on the lower surface is 500 nm or less ;
An adhesive layer provided on the upper surface of the release film,
A resin film provided on the surface of the pressure-sensitive adhesive layer opposite to the release film;
The average height of the roughness curve element (Rc) is not less 0.5μm or more, the release kinetic friction coefficient with respect to the film is Ri der 2, structured surface that having a 60 ° specular gloss of at least 1% 9% or less And a roughening layer provided on the surface of the resin film opposite to the pressure-sensitive adhesive layer. The pressure-sensitive adhesive film according to claim 1,
The roughening layer includes a particle and a binder resin. The pressure-sensitive adhesive film according to claim 1 or 2 ,
At least one of the pressure-sensitive adhesive layer, the resin film, and the roughening layer contains a colorant. The pressure-sensitive adhesive film according to any one of claims 1 to 3 ,
The pressure-sensitive adhesive layer has a thickness of 1 μm or more and 5 μm or less. The pressure-sensitive adhesive film according to any one of claims 1 to 4 ,
The thickness of the resin film is 1 μm or more and 6 μm or less. The pressure-sensitive adhesive film according to any one of claims 1 to 5 ,
The thickness of the roughened layer is 0.5 μm or more and 10 μm or less. The pressure-sensitive adhesive film according to any one of claims 1 to 6 ,
The dynamic friction coefficient of the structural surface with respect to the release film is 0.5 to 1.5. The pressure-sensitive adhesive film according to any one of claims 1 to 7 ,
The arithmetic average roughness (Ra) of the structural surface is 0.1 or more and 1.0 μm or less. The pressure-sensitive adhesive film according to any one of claims 1 to 8 ,
The pressure-sensitive adhesive film has an average height (Rc) of a roughness curve element of the structural surface of 0.5 μm or more and 5.0 μm or less. The pressure-sensitive adhesive film according to any one of claims 1 to 9 ,
The ten-point average roughness (Rzjis) of the structural surface is 1.0 μm or more and 9.0 μm or less. A pressure-sensitive adhesive film according to any one of claims 2 to 0,
The said roughening layer WHEREIN: Content of the said particle | grain is 80 to 150 mass parts adhesive film with respect to 100 mass parts of binder resin. A pressure-sensitive adhesive film according to any one of claims 1 to 1 1,
The roughening layer contains a colorant. A pressure-sensitive adhesive film according to any one of claims 1 to 1 2,
The pressure-sensitive adhesive film is configured as a long sheet. A pressure-sensitive adhesive film according to any one of claims 1 to 1 3,
The pressure-sensitive adhesive layer, the resin film, and the roughening layer are attached to the surface of a graphite sheet installed inside the electronic component.
Adhesive film.

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