JP2018104642A - Colored adhesive film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive film excellent not only in winding suitability when a thin colored adhesive film is worked by a roll-to-roll method but also in designability.SOLUTION: In a colored adhesive film, a release film has a first structure surface in which an average height (Rc) of a roughness curve element is 0.5 μm or less. An adhesive layer is provided on the surface of the release film on an opposite side to the first structure surface. A resin film is provided on the surface of the adhesive layer on an opposite side to the release film. A colored layer is provided on the surface of the resin film on an opposite to the adhesive layer, and is colored in black. A roughened layer is provided on the surface of the colored layer on an opposite side to the resin film. The roughened layer has a second structure surface in which an average height (Rc) of a roughness curve element is 0.5 μm or more and a coefficient of dynamic friction with respect to the release film is 2 or less, on an opposite side to the colored layer. The roughened layer contains inorganic particle containing barium sulfate particles, and a binder resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a colored 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, a colored layer provided on the resin film, and a roughened layer provided on the colored layer. . A resin film is a base material of a coloring adhesive tape, for example. And a colored layer exhibits black, for example, and functions as a shielding layer which makes the spot on the external appearance of a graphite sheet inconspicuous. 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 a colored adhesive film) is wound around a take-up roll.

  Thereafter, the colored 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. Thus, when manufacturing a very thin colored adhesive film by a roll-to-roll method, at the time of winding, such as blocking (attachment between the film surface and the film back surface in contact with the film), air biting (based on wrinkles), etc. Winding failure sometimes occurred. In recent years, from the viewpoint of aesthetics, the colored adhesive film is also required to have a design that looks 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 colored pressure-sensitive adhesive film that is excellent in winding property when a thin colored 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, a colored adhesive film according to an embodiment of the present invention is a colored adhesive film that protects a graphite sheet. The colored adhesive film includes a release film, an adhesive layer, a resin film, a colored layer, and a roughened layer.
The release film has a first structure surface having an average height (Rc) of roughness curve elements of 500 nm or less.
The pressure-sensitive adhesive layer is provided on the surface of the release film on the side opposite to the first structure surface.
The resin film is provided on the surface of the pressure-sensitive adhesive layer on the side opposite to the release film.
The colored layer is provided on the surface of the resin film opposite to the pressure-sensitive adhesive layer, and is colored black.
The roughening layer is provided on the surface of the colored layer on the side opposite to the resin film. The roughened layer has an average height (Rc) of roughness curve elements of 0.5 μm or more, and a second structural surface having a dynamic friction coefficient of 2 or less with respect to the release film on the side opposite to the colored layer. Have. The roughened layer contains inorganic particles containing barium sulfate particles and a binder resin.
According to such a colored pressure-sensitive adhesive film, even if the colored pressure-sensitive adhesive film is wound on a take-up roll, the colored pressure-sensitive adhesive film is less likely to cause blocking and air biting, and a thin colored pressure-sensitive adhesive film is formed by a roll-to-roll method. Excellent winding ability when processing, and excellent design. Furthermore, the adhesion of the roughened layer is also good.

In the above colored adhesive film, the roughening layer may contain 40 parts by mass or more of the inorganic particles with respect to 100 parts by weight of the binder resin.
In the above colored adhesive film, the inorganic particles further include silica particles, and in the roughened layer, the volume of the barium sulfate particles may be not less than 1/2 times and not more than 5 times the volume of the silica particles.
In the above colored adhesive film, the binder resin may include at least one of a polyester resin and a polyester urethane resin.
In the colored adhesive film, the colored layer may include at least one of a polyester resin and a polyester urethane resin.
In the above colored adhesive film, the colored layer may include a binder resin and a coloring material of 10 parts by weight or more and 70 parts by weight or less with respect to 100 parts by weight of the binder resin.
In the above colored adhesive film, the dynamic friction coefficient of the second structural surface with respect to the release film may be 0.5 or more and 1.5 or less.
In the colored adhesive film, the arithmetic average roughness (Ra) of the second structure surface may be 0.1 or more and 1.0 μm or less.
In the colored adhesive film, the average height (Rc) of the roughness curve element of the second structural surface may be not less than 0.5 μm and not more than 5.0 μm.
In the above colored adhesive film, the 10-point average roughness (Rzjis) of the second structural surface may be 1.0 μm or more and 9.0 μm or less.
In the colored adhesive film, in the roughened layer, the ratio of the silica particles to the barium sulfate particles may be 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the barium sulfate particles. .
In the above colored adhesive film, the second structural surface may have a 60 ° specular gloss of 1% or more and 50% or less.
In the above colored adhesive film, the roughened layer may have a thickness of 0.5 μm or more and 10 μm or less.
In the colored adhesive film, the pressure-sensitive adhesive layer may have a thickness of 1 μm or more and 5 μm or less.
In the above colored adhesive film, the resin film may have a thickness of 1 μm to 6 μm.
In the above colored adhesive film, the colored layer may have a thickness of 0.5 μm or more and 5 μm or less.
In the above colored adhesive film, the silica particles may have an average particle size of 1 μm to 10 μm, and the barium sulfate particles may have an average particle size of 50 nm to 1 μm.
The colored adhesive film may be formed in a long sheet shape.
In the above colored adhesive film, the pressure-sensitive adhesive layer, the resin film, the colored layer, and the roughened layer are attached to the surface of a graphite sheet installed inside the electronic component.

  According to such a colored adhesive film, even if the colored adhesive tape is wound around a take-up roll, the colored adhesive tape is less likely to cause blocking and air biting, and in the graphite sheet to which the colored adhesive tape is attached, Appearance improves more. Further, the adhesion of the roughened layer is good.

  As described above, according to the present invention, it is possible to provide a colored adhesive film that is excellent in winding property when a thin colored adhesive film is processed by a roll-to-roll method and has excellent design properties.

Drawing (a) is a schematic three-dimensional figure of the state where the colored adhesion film concerning this embodiment was wound. FIG. (B) is a schematic cross-sectional view of the colored adhesive film according to this embodiment. Drawing (c) is a schematic sectional view of the roughening layer in the colored adhesion film concerning this embodiment. It is a schematic sectional drawing of the state where the graphite sheet with a coloring adhesive tape concerning this embodiment was stuck on the case via a double-sided tape. It is the schematic explaining the manufacturing process of the colored 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 colored adhesive film]

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

  As shown to Fig.1 (a), the colored adhesive film 2 which concerns on this embodiment is comprised by the elongate sheet form. The colored 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 colored adhesive film 2 is wound around a winding roll (winding core) 410 in the longitudinal direction DL. The length (full length) in the longitudinal direction DL of the colored adhesive film 2 wound around the take-up roll 410 is, for example, 6000 m or more and 10000 m or less. The length of the colored 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 colored adhesive film 2 wound around the winding roll 410 is formed by, for example, a roll-to-roll method. The colored adhesive film 2 wound around the winding roll 410 is cut into a predetermined width by a roll-to-roll method, and then cut into a predetermined shape, for example, a graphite sheet installed inside an electronic component. Used as protective tape to protect. For example, the colored adhesive film 2 wound around the take-up roll 410 may be cut for each 100 mm width in the width direction DW and divided into a plurality of pieces. In the divided colored adhesive film 2, it may be wound around another winding roll again. 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 colored adhesive film 2 will be described.
As shown in FIG. 1B, the colored adhesive film 2 includes a resin film 11, a colored layer 12, a roughened layer 15, an adhesive layer 20, and a release film 30. In the example of FIG. 1B, the colored adhesive film 2 is laminated in the order of release film 30 / adhesive layer 20 / resin film 11 / colored layer 12 / 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 colored adhesive film 2, the release film 30 can be peeled off from the interface between the release film 30 and the pressure-sensitive adhesive layer 20. In this embodiment, a configuration in which the release film 30 is peeled off from the colored adhesive film 2 is referred to as a colored adhesive tape 1. The colored adhesive tape 1 includes a resin film 11, a roughened layer 15, a colored layer 12, and an 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. The pressure-sensitive adhesive layer 20 is provided on the surface of the release film 30. For example, the pressure-sensitive adhesive layer 20 is provided on the surface of the release film 30 opposite to the lower surface 30 d of the release film 30. For example, 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. For example, the resin film 11 is provided between the colored layer 12 and the pressure-sensitive adhesive layer 20. The resin film 11 is a base material for the colored adhesive film 2. The colored layer 12 is provided on the surface of the resin film 11 opposite to the pressure-sensitive adhesive layer 20. For example, the colored layer 12 is provided between the resin film 11 and the roughened layer 15. The colored layer 12 is provided to impart designability to the colored adhesive film 2. The colored layer 12 is also a layer that improves the adhesion between the resin film 11 and the roughened layer 15. The roughening layer 15 is provided on the surface of the colored layer 12 on the side opposite to the resin film 11.

  FIG. 1C shows an example of a cross section of the roughened layer 15. For example, the roughened layer 15 includes inorganic particles 15p and a binder resin 15b containing the inorganic particles 15p. The inorganic particles 15p include barium sulfate particles as an essential component. On the upper surface 15u of the roughened layer 15, the inorganic particles 15p may be exposed or the binder resin 15b may be exposed. The average particle diameter of the inorganic particles 15p is 50 nm or more and 10 μm or less.

  The roughening layer 15 is the uppermost layer in the example of FIG. That is, the roughened layer 15 containing the inorganic particles containing barium sulfate particles and the binder resin is provided on the colored layer 12 colored black. Here, the average particle diameter of barium sulfate is 50 nm or more and 10 μm or less. Depending on the type of inorganic particles contained in the roughened layer, the appearance of the graphite sheet 100 may be yellowish. Thereby, the appearance of the graphite sheet 100 may be reduced.

  In the colored adhesive film 2, a roughened layer 15 containing inorganic particles containing barium sulfate particles and a binder resin is provided on the colored layer 12 colored black. Thereby, the appearance of the graphite sheet 100 to which the colored adhesive tape 1 is affixed is not yellowish and the appearance of the graphite sheet 100 is improved. For example, the appearance of the entire surface of the graphite sheet 100 becomes black with a matte feeling.

  Further, when the colored adhesive film 2 is wound around the take-up roll 310, the upper surface 15 u of the roughened layer 15 is in contact with the surface (the lower surface 30 d) on the opposite side of the release film 30 from the adhesive layer 20. become. Here, the lower surface 30 of the release film 30 is a first structural surface, and the upper surface 15u of the roughened layer 15 is a second structural surface. The upper surface 15 u of the roughened layer 15 is the surface of the roughened layer 15 on the side opposite to the colored layer 12.

  The arithmetic average roughness Ra of the upper surface 15u of the roughened layer 15 is preferably 0.1 μm or more, more preferably 0.1 μm or more and 1.0 μm or less, and still more preferably 0.2 μm or more and 0.00. 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 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 and 7.0 μm or less. It is 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. Thereby, even if the colored adhesive film 2 is wound around the take-up roll 410, the colored adhesive film 2 is less likely to cause blocking and air biting, and the thin colored adhesive film 2 is processed by the roll-to-roll method. Excellent winding ability. 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 designability when the graphite sheet 100 with the colored adhesive film 2 is placed inside the 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. The lower limit of the dynamic friction coefficient is preferably 0.5 or more, more preferably 1 or more. When the dynamic friction coefficient exceeds 2, blocking may occur when the colored adhesive film 2 is wound around the winding roll 410. In addition, when the dynamic friction coefficient is less than 0.5, there is a possibility that winding deviation may occur when the colored adhesive film 2 is wound around the winding roll 410.

  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 colored adhesive film 2 attached, the appearance is matte, and when the colored adhesive tape 1 is installed inside the electronic component, the colored adhesive tape 1 is integrated with the electronic component. Since it seems to have become, it has an excellent design.

  In the colored adhesive film 2, the layers adjacent to each other in the Z-axis direction may be in direct contact or in indirect contact. 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 colored adhesive film 2 may be a single layer or may be composed of a plurality of layers.

  In the colored 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 μm 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 it is 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. If the thickness of the pressure-sensitive adhesive layer 20 exceeds 5 μm, the colored 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, preferably 1 μm to 6 μm, and more preferably 1 μm to 3 μm. 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 colored pressure-sensitive adhesive film 2 becomes thick and does not satisfy the demand for thinning.

  The thickness of the colored layer 12 is, for example, preferably from 0.5 μm to 10 μm, and more preferably from 0.8 μm to 3 μm. When the thickness of the colored layer 12 is less than 0.5 μm, the adhesion between the resin film 11 and the roughened layer 15 is lowered, and the roughened layer 15 may be peeled off from the resin film 11 in some cases. On the other hand, when the thickness of the colored layer 12 exceeds 10 μm, the colored adhesive film 2 becomes thick and does not satisfy the demand for thinning.

  The thickness of the roughened layer 15 is, for example, preferably from 0.5 to 10 μm, preferably from 0.6 to 3.0 μm, more preferably from 0.8 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 colored adhesive film 2 becomes thick and there is a demand for thinning. Do not meet.

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

  Moreover, the yellowness (b *) of the colored adhesive tape 1 is preferably −1.5 or less, more preferably −1.6 or less, and further preferably −1.65 or less. When the yellowness (b *) of the colored adhesive tape 1 exceeds −1.5, the appearance of the graphite sheet with the colored adhesive tape may be yellowish, and the appearance of the graphite sheet 100 may be reduced. The lower limit of the yellowness (b *) is not particularly limited, but is preferably −5.0 or more, more preferably −4.0 or more, and further preferably −3.0 or more.

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

  As shown in FIG. 2, the colored adhesive tape 1 from which the release film 30 has been peeled off is attached to, for example, a graphite sheet 100. For example, the exposed surface of the pressure-sensitive adhesive layer 20 of the colored 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.

  Further, since the colored adhesive tape 1 is extremely thin, it can be arranged in the electronic product without harming the internal space of the small electronic product. Furthermore, since the colored adhesive tape 1 is provided with the colored layer 12, the appearance of the graphite sheet can be made inconspicuous. Furthermore, since the colored adhesive tape 1 is provided with the roughened layer 15, it has a matte appearance. Thereby, since the colored adhesive tape 1 seems to be integrated with the electronic component (it appears to be melted), the colored adhesive tape 1 is hardly noticeable and the design is improved.

  In the colored adhesive tape 1, at least one of the adhesive layer 20, the resin film 11, and the roughened layer 15 may contain a colorant. 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.

  The material of each layer in the colored adhesive film 2 and the measurement method of 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 colored black. Thereby, the spots on the appearance of the graphite sheet 100 become inconspicuous, match the color of the electronic component to which the colored adhesive tape is attached, and the colored adhesive tape 1 seems to be integrated with the electronic component (is seen to melt). Therefore, the colored pressure-sensitive adhesive tape 1 is less noticeable and the design is improved.

  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. Of these, polyester urethane resin is preferred because of its excellent flexibility. The polyester urethane resin preferably has a glass transition temperature (Tg) of −30 to 10 ° C.

  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, a known and commonly used black pigment or black dye can be used, and examples thereof include carbon black.

  The colored layer may further contain additives such as other pigments and dyes, a transparent resin (medium), an antioxidant, an ultraviolet absorber, and a light stabilizer as necessary. 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.

[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., if desired. 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 colored adhesive film 2 is wound around the take-up roll 410, the upper surface 15u (second structure surface) of the roughened layer 15 comes into contact with the lower surface 30d (first structure surface) of the release film 30. For this reason, it is preferable that arithmetic mean roughness Ra of the lower surface 30d of a peeling film is 50 nm or less, and it is more preferable that it is 40 nm or less. The lower limit of Ra of the lower surface 30d is, for example, 10 nm. The average height Rc of the roughness curve element on the lower surface 30d is 500 nm or less, and preferably 450 nm or less. The lower limit of Rc of the lower surface 30d is, for example, 100 nm. The 10-point average roughness Rzjis of the lower surface 30d is preferably 800 nm or less, and more preferably 700 nm or less. The lower limit of Rzjis of the lower surface 30d is, for example, 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 if the upper surface 15u of the roughening layer 15 contacts the lower surface 30d of the release film 30 when the colored adhesive film 2 is wound on the take-up roll 310, Ra, Rc of the lower surface 30d of the release film 30 And Rzjis are set in the above range, the colored adhesive film 2 is less likely to cause blocking and air biting, and is excellent in winding property when the thin colored adhesive film 2 is processed by a roll-to-roll method. .

[Roughening layer]
The material of the second structural surface of the roughened layer is not particularly limited as long as the arithmetic average roughness Ra, the average height Rc of the roughness curve element, and the 10-point average roughness Rzjis are in desired ranges. The roughened layer is prepared by adjusting Ra, Rc and Rzjis of the upper surface 15u by a method of corona discharge treatment, sandblasting, a method of transferring the roughness of the roll surface by pressing a rough roll surface onto the upper surface, and the like. May be.

  The roughened layer contains inorganic particles containing barium sulfate particles and a binder resin. The roughness and the like can be easily adjusted by adjusting the average particle diameter, blending amount, and the like of the inorganic particles. The average particle diameter of the inorganic 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 these, a thermoplastic resin is preferable because of excellent flexibility, and a urethane resin, a polyester resin, and a polyester urethane resin are preferable. Among these, from the viewpoint of dispersibility and adhesion with inorganic particles, the binder resin is preferably at least one of a polyester resin and a polyester urethane resin, and more preferably a polyester resin.

  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.

  In the roughened layer 15, inorganic particles or organic particles other than barium sulfate particles may be mixed. Thus, the selection range of the color of the roughening layer 15 can be expanded by mix | blending other particle | grains.

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 ), titanium oxide, and calcium carbonate. These may be used alone or in combination of two or more. Among these, inorganic particles are preferable and silica particles are more preferable because of easy adjustment of specular gloss and color selection range, ease of particle size adjustment, and availability.

  The volume ratio of silica and barium sulfate ([silica volume]: [barium sulfate volume]) is in the range of 100: 50 to 100: 500. That is, in the roughened layer, the volume of the barium sulfate particles is preferably set to be not less than 1/2 times and not more than 5 times the volume of the silica particles. In the roughened layer, the ratio (mass) of the silica particles to the barium sulfate particles is preferably 1 part by mass or more and 100 parts by mass or less, preferably 5 parts by mass or more and 80 parts by mass with respect to 100 parts by mass of the barium sulfate particles. The following is more preferable, and 10 mass parts or more and 50 mass parts or less are still more preferable. The content of the inorganic particles containing barium sulfate 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, with respect to 100 parts by mass of the binder resin. Is more preferably 80 parts by mass or more and 125 parts by mass or less. When the content of the added inorganic particles 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 rough surface There is a possibility that the 60 ° specular gloss of the chemical layer 15 exceeds 50%.

  When the content of the inorganic particles increases, the roughened layer 15 decreases in adhesion with the resin film 11. In particular, when the content of the inorganic particles is 60 parts by mass or more with respect to 100 parts by mass of the binder resin, the adhesion is significantly reduced. In the colored adhesive film 2 according to this embodiment, the colored layer 12 is provided between the resin film 11 and the roughened layer 15. The colored layer 12 functions as a layer that improves the adhesion between the resin film 11 and the roughened layer 15, and the roughened layer 15 has an inorganic particle content of 100 parts by weight of the binder resin. Even if it is a case of 60 mass parts or more, it becomes the colored adhesive film 2 with favorable adhesiveness.

  The average particle diameter of the particles is not particularly limited, but is preferably 0.5 μm 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 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.

  The average particle size is defined as a peak top value measured by a Coulter counter method.

  In the colored adhesive film 2, when at least one kind of silica and barium sulfate particles is dispersed in the roughened layer 15, the blending ratio of the silica particles and the barium sulfate particles in the roughened layer 15 is determined. By changing, the selection range of the color of the roughening layer 15 can be expanded. For example, by increasing the amount of barium sulfate particles relatively, the color of the roughened layer 15 becomes stronger in blue. 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.

  Further, when the particles are dispersed in the roughened layer 15, scratches are made on the upper surface 15 u of the roughened layer 15 when the colored adhesive film 2 is wound up or when the colored adhesive film 2 is transferred. It becomes difficult to enter such damage. Thereby, the productivity of the colored adhesive film 2 is further improved.

  Further, when the particles are dispersed in the roughened layer 15, the roughened layer 15 is taken up when the colored adhesive film 2 is wound around the winding roller 410 or when the colored adhesive film 2 is transferred. It becomes difficult for damage such as scratches to enter the upper surface 15u. Thereby, the productivity of the colored adhesive film 2 is further improved.

[Average particle size measurement]
The average particle diameter of the inorganic particles and the organic particles is not particularly limited, but 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 colored adhesive tape 1, 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 colored 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.3 (a)-FIG.3 (c) are the schematic diagrams explaining the manufacturing process of the colored adhesive film which concerns on this embodiment. In this embodiment, the colored adhesive film 2 is manufactured by a roll-to-roll method. The colored 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 rolls 240b and 240c, and the resin film 11 is fed out between the rolls 240b and 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 by the rotation of 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 mechanism 320 applies the coating liquid for the colored layer 12 to the resin film 11.

  The pressure-sensitive adhesive film 52 coated with the colored layer 12 is guided to the drying chamber 330 through the guide roll 350b and dried at a predetermined temperature, for example, for 10 seconds to 5 minutes. Thereby, the colored adhesive film 53 in which the colored layer 12 is provided on the resin film 11 of the adhesive film 52 is formed. The colored adhesive film 53 is continuously wound around the winding roll 310 by the rotation of the winding roll 310 through the guide roll 350c.

  The colored adhesive film 53 wound around the unwinding roll 411 is continuously unwound by the rotation of the unwinding roll 411 and is guided to the coating mechanism 420 via the guide roll 450a. The coating mechanism 420 applies the coating liquid for the roughened layer 15 to the resin film 11.

  The colored adhesive film 53 coated with the roughened layer 15 is guided to the drying chamber 430 through the guide roll 450b and dried at a predetermined temperature, for example, for 10 seconds to 5 minutes. Thereby, the colored adhesive film 2 in which the roughened layer 15 is provided on the colored layer 12 of the colored adhesive film 53 is formed. The colored adhesive film 2 is continuously wound around the winding roll 410 by the rotation of the winding roll 410 via the guide roll 450c.

  In addition, as for the coating method in the coating mechanism 220, the coating mechanism 320, and the coating mechanism 420, 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, and a gravure coating method may be used. May be applied.

  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) and 100 parts by mass of barium sulfate fine particles (manufactured by Sakai Chemical Industry Co., Ltd .: BMH average particle diameter of 2.5 μm), and a toluene / methyl ethyl ketone (MEK) mixed solvent (toluene: MEK (mass ratio)) = 50:50), the solid 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.

  Next, 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 is further heat-treated. 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 formed in the same manner as in Example 1 except that the roughening layer coating solution C was used.

<Preparation of coating solution C for roughening layer>
The coating solution C for the roughening layer is based on 100 parts by mass of polyester resin (Toyobo: Byron 20SS) as a binder resin (solid content conversion), barium sulfate fine particles (manufactured by Wako Pure Chemical Industries, Ltd .: BMH average particle diameter 2). 0.0 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).

[Comparative Example 1]
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 (NIPSIL SS50B, manufactured by Tosoh Silica Co., Ltd., average particle size 2) with respect to 100 parts by mass (in terms of solid content) of 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).

[Surface roughness measurement]
The average height Rc, arithmetic average roughness Ra, and 10-point average roughness Rzjis of the roughness curve element on the surface of the roughened layer are measured using a contact surface roughness meter (product name “SV3000S4” manufactured by Mitutoyo Corporation). , Measured according to JIS B 0601-2001.

  The average height Rc, arithmetic average roughness Ra, and 10-point average roughness Rzjis of the curvilinear element on the surface opposite to the adhesive layer of the release film (lower surface 30d) are a contact type surface roughness meter (Mitutoyo Corporation, Measured according to JIS B 0601-2001 using a product name “SV3000S4”).

  [60 ° specular gloss]

  Using a gloss meter “VG7000” manufactured by Nippon Denshoku Industries Co., Ltd., the measurement was performed according to JIS K 7105.

  [Dynamic friction coefficient measurement]

  Based on JIS K7125, the dynamic friction coefficient between the surface of the roughened layer of the adhesive film and the surface (lower surface 30d) opposite to the adhesive layer of the release film was measured. The load was 200 g, and a universal tensile tester Tensilon (manufactured by A & D Co., Ltd.) was used for the measurement.

  Table 1 shows the structures of the adhesive films in Examples 1 to 3 and Comparative Examples 1 to 3, Tables 2 and 3 show the surface roughness of the roughened layers in Examples 1 to 3 and Comparative Examples 1 to 3, and the colored layers. Surface roughness, surface roughness of the adhesive film, dynamic friction coefficient of the roughened layer or colored layer to the release film, 60 ° specular gloss of the adhesive film, appropriate winding of the adhesive film, evaluation of the design properties of the adhesive film and rough surface The adhesion between the chemical layer and the resin film is shown.

  [Evaluation of winding aptitude]

In each process, the presence or absence of winding deviation after winding into a roll, the presence or absence of blocking during winding, and the presence or absence of air biting (based on wrinkles) are visually observed, and winding suitability is evaluated according to the following criteria. did. Here, in the winding suitability in Table 3, A and B are:
A: There is no occurrence of blocking and air biting, and the winding property is stable.
B: Blocking or air biting occurs, but there is a range where there is a risk of practical problems.
Means that.

  [Design evaluation]

  The adhesive film from which the release film was peeled off was bonded to a Kaneka graphite sheet “Graphinity 25 μm” 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 3, A and C are:

A: The shine or glare on the adhesive film surface was hardly visually recognized, and the design was good.
C: Although the shine or glare of the adhesive film surface was hardly visually recognized, it was slightly yellowish and inferior in design to A.
Means that.

[Adhesion evaluation]
A cross-cut peel test was performed as an adhesive evaluation of the adhesive film. On the surface of the roughened layer of the pressure-sensitive adhesive film, 11 vertical and 11 horizontal cuts were formed in a grid pattern with a cutter knife at intervals of 1 mm, and a total of 100 squares were formed in the roughened layer. The 100 squares are affixed to an adhesive tape (manufactured by Nichiban Co., Ltd., “Cellotape (registered trademark)”), and are roughened in accordance with the cross-cut tape method of JIS K 5600-5-6 (cross-cut method). In the adhesion evaluation in Table 3, A and B are:

A: There was no peeling at all in the 100 squares.
B: One or more squares peeled off among 100 squares.
Means that.

[Measurement of yellowness (b *)]
The adhesive film was cut into a size of 50 mm × 50 mm in an environment of 23 ° C. and 50% RH (relative humidity). Next, the release film was removed, the pressure-sensitive adhesive layer was attached to a glass plate, and a test sample was produced. Next, the yellowness (b *) of the test sample was measured according to JIS K 7105 with a color computer spectroscopic color difference meter (Nippon Denshoku Co., Ltd., Spectrophotometer SE6000).

  As shown in Tables 2 and 3, in Examples 1 and 2, the Rc of the roughened layer that is 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. It is. In this case, the winding suitability was “A”.

  In Examples 1 and 2, the 60 ° specular gloss is 0.5% or more and 50% or less. However, 60 ° specular gloss was lower in Example 1 in which silica particles were mixed as inorganic particles than in Example 1. Furthermore, in Examples 1 and 2, both yellowness is -1.5 or less. In this case, the design evaluation was “A”.

  In Examples 1 and 2, a colored layer was provided between the resin film and the roughened layer, and the adhesion between the resin film and the roughened layer was “A”.

  On the other hand, in Comparative Example 1, the yellowness was higher than -1.5, and the design evaluation was "C".

  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 ... Colored adhesive film 11 ... Resin film 12 ... Colored layer 15 ... Roughening layer 15p ... Inorganic particle 15b ... Binder resin 15u ... Upper surface 20 ... Adhesive layer 30 ... Release film 30d ... Lower surface 51 ... Adhesive Release film with layer 52 ... Adhesive film 53 ... Colored adhesive film 100 ... Graphite sheet 101 ... Double-sided tape 102 ... Housing 200 ... Manufacturing apparatus 210 ... Winding roll 211 ... Unwinding roll 220 ... Application mechanism 230 ... Drying chamber 240 ... Paste Mechanism 240a ... Unwinding roll 240b ... Roll 240c ... Roll 250a, 250b, 250c, 250d ... Guide roll 260 ... Pretreatment mechanism 300 ... Manufacturing apparatus 310 ... Winding roll 311 ... Unwinding roll 320 ... Coating mechanism 330 ... Drying chamber 350a , 350b, 350c ... guide roll 40 DESCRIPTION OF SYMBOLS 0 ... Manufacturing apparatus 410 ... Winding roll 411 ... Unwinding roll 420 ... Application | coating mechanism 430 ... Drying chamber 450a ... Guide roll 450b ... Guide roll 450c ... Guide roll

Claims (19)

A colored adhesive film for protecting a graphite sheet,
A release film having a first structural surface with an average height (Rc) of roughness curve elements of 500 nm or less;
An adhesive layer provided on the surface of the release film opposite to the first structure surface;
A resin film provided on the surface of the pressure-sensitive adhesive layer opposite to the release film;
A colored layer provided on the surface of the resin film opposite to the pressure-sensitive adhesive layer and colored black;
A second structure provided on the surface of the colored layer opposite to the resin film, having an average height (Rc) of roughness curve elements of 0.5 μm or more, and a coefficient of dynamic friction with respect to the release film of 2 or less. A colored pressure-sensitive adhesive film having a surface opposite to the colored layer and comprising a roughened layer containing inorganic particles containing barium sulfate particles and a binder resin. The colored adhesive film according to claim 1,
The roughening layer contains 40 parts by mass or more of the inorganic particles with respect to 100 parts by weight of the binder resin. The colored adhesive film according to claim 1 or 2,
The inorganic particles further include silica particles.
Colored adhesive film. The colored adhesive film according to any one of claims 1 to 3,
The binder resin includes at least one of a polyester resin and a polyester urethane resin. The colored adhesive film according to any one of claims 1 to 4,
The colored layer includes at least one of a polyester resin and a polyester urethane resin. A colored adhesive film according to any one of claims 1 to 5,
The colored layer includes a binder resin and a coloring material of 10 to 70 parts by weight with respect to 100 parts by weight of the binder resin. The colored adhesive film according to any one of claims 1 to 6,
The dynamic friction coefficient of the second structure surface with respect to the release film is 0.5 or more and 1.5 or less. The colored adhesive film according to any one of claims 1 to 7,
The arithmetic average roughness (Ra) of the second structural surface is 0.1 or more and 1.0 μm or less. A colored adhesive film according to any one of claims 1 to 8,
An average height (Rc) of the roughness curve element of the second structure surface is 0.5 μm or more and 5.0 μm or less. The colored adhesive film according to claim 1,
The 10-point average roughness (Rzjis) of the second structural surface is 1.0 μm or more and 9.0 μm or less. The colored adhesive film according to any one of claims 3 to 10, wherein
In the roughened layer, the ratio of the silica particles to the barium sulfate particles is 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the barium sulfate particles. The colored adhesive film according to claim 1,
The colored adhesive film, wherein the second structural surface has a 60 ° specular gloss of 1% to 50%. The colored adhesive film according to any one of claims 1 to 12,
The roughened layer has a thickness of 0.5 μm or more and 10 μm or less. A colored adhesive film according to any one of claims 1 to 13,
The pressure-sensitive adhesive layer has a thickness of 1 μm or more and 5 μm or less. The colored adhesive film according to any one of claims 1 to 14,
The resin film has a thickness of 1 μm to 6 μm. The colored adhesive film according to any one of claims 1 to 15,
The colored layer has a thickness of 0.5 μm or more and 5 μm or less. The colored adhesive film according to any one of claims 3 to 16,
The average particle diameter of the silica particles is 1 μm or more and 10 μm or less,
The average particle diameter of the barium sulfate particles is 50 nm or more and 1 μm or less. A colored adhesive film according to any one of claims 1 to 17,
The colored adhesive film is configured in a long sheet shape. A colored adhesive film according to any one of claims 1 to 18,
The pressure-sensitive adhesive layer, the resin film, the colored layer, and the roughened layer are attached to the surface of a graphite sheet installed inside the electronic component.
Colored adhesive film.

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