JP6225378B2 - Double-sided adhesive sheet and article - Google Patents

Description

  The present invention relates to a double-sided pressure-sensitive adhesive sheet that can be used for fixing decorative members such as punching sheets and various electronic components.

  In the manufacturing process of an electronic device, an adhesive sheet is used for the purpose of fixing various components constituting the electronic device. As a speaker provided in a television, radio, personal computer, and various mobile terminals, a punching sheet having a through hole is often fixed to the casing with an adhesive sheet. As the pressure-sensitive adhesive sheet used for the above-mentioned application, a light-shielding pressure-sensitive adhesive sheet is often used for the purpose of preventing a deterioration in design properties due to the visual recognition of the pressure-sensitive adhesive sheet.

  As the light-shielding pressure-sensitive adhesive sheet, for example, a double-sided pressure-sensitive adhesive sheet using a black acrylic pressure-sensitive adhesive in which 2 parts by weight of a black pigment is added to 100 parts by weight of an acrylic polymer and a nonwoven fabric substrate is known (for example, Patent Document 1).

  However, the pressure-sensitive adhesive sheet often contains, for example, a large amount of carbon black in the pressure-sensitive adhesive layer for the purpose of imparting a higher level of light-shielding properties. Although it is excellent in performance, it may cause a decrease in the adhesion strength to the adherend, the holding force in the shearing direction, and the constant load holding force in the 90-degree direction.

  On the other hand, in the past, organic solvent-type pressure-sensitive adhesives have been widely used for forming the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive sheet. There is a need to provide a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed using an emulsion-type pressure-sensitive adhesive instead of the above.

  As a light-shielding pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed using the emulsion-type pressure-sensitive adhesive, for example, a water-dispersible acrylic polymer as a main component and a pressure-sensitive adhesive composition containing a colorant are formed into a sheet shape. A light-shielding pressure-sensitive adhesive sheet having a light-shielding pressure-sensitive adhesive layer obtained in this manner, wherein the light-shielding pressure-sensitive adhesive sheet has a total light transmittance of 1% or less (see, for example, Patent Document 2). ).

  However, when an emulsion-type pressure-sensitive adhesive is used to form a pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive sheet, the effect of a colorant such as carbon black is greater than when a solvent-type pressure-sensitive adhesive is used. In some cases, the cohesive force may be significantly reduced. As a result, the adhesion force to the adherend, the holding force in the shear direction, and the constant load holding force in the 90 degree direction may be significantly reduced. In addition, the pressure-sensitive adhesive sheet in which the amount of the colorant contained in the pressure-sensitive adhesive layer is simply adjusted to maintain the pressure-sensitive adhesive performance does not have a practically sufficient light-shielding property, and particularly in applications where high design properties are required. In some cases, the color may be lowered.

  In addition, when the above-described pressure-sensitive adhesive sheet is used and the punching sheet or the like is fixed, the surface of the pressure-sensitive adhesive layer that is visually recognized through the through-hole of the punching sheet is glaring due to light reflection, and the design of the article May be damaged.

JP 2009-263593 A Japanese Patent Laid-Open No. 2007-154078

  The problem to be solved by the present invention is a level of light shielding property capable of maintaining excellent color even when used in applications requiring high designability, and a level capable of suppressing glare caused by light reflection. An object of the present invention is to provide a double-sided pressure-sensitive adhesive sheet that has a matte property and has an excellent adhesion to an adherend, a holding force in a shearing direction, and a constant load holding force in a 90-degree direction.

  In addition, the second problem to be solved by the present invention is an excellent color tone or the like even when using an emulsion type acrylic pressure-sensitive adhesive, or when used for applications requiring high design properties. It has a light-shielding property that can be held and a matte property that can suppress glare caused by reflection of light, and has excellent adhesion to the adherend, holding power in the shear direction, and 90-degree orientation. It is to provide a double-sided pressure-sensitive adhesive sheet having a constant load holding force.

  The third problem to be solved by the present invention is to provide a double-sided PSA sheet that is less likely to cause the matte property to deteriorate with time.

  The present inventors not only reduce the amount of the colorant contained in the pressure-sensitive adhesive layer, but also use the nonwoven fabric substrate having a total light transmittance of 5% to 70% as the nonwoven fabric substrate. I found that the problem could be solved.

  That is, this invention is a double-sided adhesive sheet which has an adhesive layer (B1) on the single side | surface or both surfaces of the nonwoven fabric base material (A) whose total light transmittance measured according to JISK7136 is 5%-70%, The initial glossiness of the surface of the pressure-sensitive adhesive layer (B1) is 20% or less.

  The double-sided pressure-sensitive adhesive sheet of the present invention has an excellent shielding property (light-shielding property) against light and the like, and has an excellent adhesion to the adherend, a holding force in the shear direction, and a constant load holding in the 90-degree direction. Because it has power, it can be used for applications that require high design, especially for decorative members that make up speakers for TVs, radios, audio products, personal computers, etc., and decorative members that make up exhaust ports Can be suitably used for fixing. In particular, the double-sided pressure-sensitive adhesive sheet is suitably used for fixing a punching sheet constituting a speaker or the like that is required to have a higher design because it has a matte property that can suppress glare due to reflection of light. Is possible.

  Further, the double-sided pressure-sensitive adhesive sheet of the present invention has an excellent shielding property (light-shielding property) against light and the like even when an emulsion-type acrylic pressure-sensitive adhesive is used instead of the conventional solvent-type acrylic pressure-sensitive adhesive, and Since it has an excellent adhesion force to the adherend, a holding force in the shearing direction, and a constant load holding force in the 90-degree direction, the influence on the environment and the human body can be reduced.

  The double-sided pressure-sensitive adhesive sheet of the present invention is a double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer (B1) on one side or both sides of a nonwoven fabric substrate (A) having a total light transmittance of 5% to 70% measured according to JIS K7136. The initial glossiness of the surface of the pressure-sensitive adhesive layer (B1) is 20% or less.

  As the double-sided pressure-sensitive adhesive sheet, it is preferable to use a sheet having a total thickness of 200 μm or less, and using a sheet having a thickness of 100 μm to 200 μm is particularly suitable for an adherend having a through-hole such as a punching sheet. It is preferable because it can exhibit excellent adhesive strength.

  As the double-sided pressure-sensitive adhesive sheet, it is preferable to use a sheet having a total light transmittance of 50% or less measured according to JIS K7136, and it is preferable to use a sheet having a range of 0.1% to 50%. It is preferable for maintaining good light shielding properties. In particular, when the double-sided pressure-sensitive adhesive sheet is used for fixing a decorative member constituting a speaker or the like, JIS K7136 provides a moderate light-shielding property to the speaker or the like and a higher level of design. It is preferable to use a double-sided PSA sheet having a total light transmittance of 40% or less measured according to the above, more preferably from 0.1% to 40%, and from 0.1 to 10% It is particularly preferred to use

  As a nonwoven fabric base material (A) which comprises the said double-sided adhesive sheet, the thing whose total light transmittance measured according to JISK7136 is 5%-70% is used. By using a nonwoven fabric substrate having the above-mentioned total light transmittance, it is possible to maintain good light shielding properties.

  The nonwoven fabric substrate (A) preferably has a total light transmittance of 10% to 60%, and is preferably 15% to 35% for the adherend. It is preferable because excellent light shielding properties can be maintained without impairing the adhesive force and the constant load holding force. In addition, the total light transmittance of the said nonwoven fabric base material (A) can be adjusted by the method of coloring the conventional nonwoven fabric using a coloring agent, the method of raising the density of a nonwoven fabric, etc., for example. As the non-woven fabric substrate (A), it is possible to impart excellent design properties to the final product and moderate light-shielding properties without impairing the holding force in the shear direction and the constant load holding force in the 90-degree direction of the double-sided PSA sheet. Since it is possible to achieve both imparting, it is preferable to use a nonwoven fabric substrate colored with a colorant.

  As the non-woven fabric substrate (A), it is preferable to use a material having a thickness of 10 μm to 200 μm, and it is preferable to use a material having a thickness of 15 μm to 80 μm. Since the layer (B2) appropriately impregnates the nonwoven fabric substrate (A), the adhesion between the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B1) or pressure-sensitive adhesive layer (B2) can be improved.

The basis weight of the nonwoven fabric base material (A) is not particularly ^limited, it is preferably in the range of ^{5g / m 2 ~25g / m 2} , in the range of ^{8g / m 2 ~20g / m 2} , Adhesion between the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B1) or pressure-sensitive adhesive layer (B2) can be improved.

Density of the nonwoven fabric base material (A) is not particularly limited, is preferably in the range of 0.1 to 0.8 g / cm ^3, in the range of 0.3-0.6 g / cm ³ The adhesion between the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B1) or pressure-sensitive adhesive layer (B2) can be improved.

  As the nonwoven fabric substrate (A), a colored nonwoven fabric can be used.

  As said colored nonwoven fabric, what colored the nonwoven fabric (a) manufactured previously, for example using a coloring agent can be used.

  Examples of the non-woven fabric (a) include non-woven fabric obtained by using chemical fibers such as manila hemp, wood pulp, rayon, acetate fiber, polyester fiber, vinylon fiber (polyvinyl alcohol fiber), polyamide fiber, and mixtures thereof. Can be used.

  When manufacturing a nonwoven fabric (a) using the said fiber, you may use the conventionally known reinforcement | strengthening agent for the purpose of improving a tensile strength etc. further.

  Examples of the reinforcing agent include internal reinforcing agents such as polyacrylamide resins, urea-formaldehyde resins, melamine-formaldehyde resins, and epoxy-polyamide resins; starch, viscose, carboxymethylcellulose, polyvinyl alcohol, polyacrylamide, and the like. An external additive reinforcing agent or the like can be used. Among these, as the reinforcing agent, it is preferable to use a polyamide / epichlorohydrin resin, which is an epoxy-polyamide resin, as an internal additive reinforcing agent.

  The internal additive reinforcing agent is preferably used in the range of 0.2% by mass to 1% by mass with respect to the mass of the nonwoven fabric (a), and is used in the range of 0.3% by mass to 0.5% by mass. It is more preferable.

  Examples of the colorant that can be used in the production of the nonwoven fabric substrate (A) include direct dyes, reactive dyes, sulfur dyes, basic dyes, acid dyes, metal-containing acid dyes, indigo dyes, selenium dyes, disperse dyes, and cationic dyes. Dyes such as dyes; pigments such as organic pigments and inorganic pigments can be used alone or in combination of two or more. As the colorant, it is preferable to use a black colorant containing carbon black or the like in order to obtain a nonwoven fabric substrate (A) having a total light transmittance in the above range.

  As the colorant, one containing a thermoplastic resin as a binder component can be used for the purpose of further strengthening the adhesion of the pigment or the like to the nonwoven fabric (a). Examples of the thermoplastic resin that can be used include acrylic resins, polyurethane resins, polyester resins, and chlorinated polyolefin resins.

  In addition, as the colorant, for the purpose of further strengthening the adhesion of the pigment or the like to the nonwoven fabric (a), aluminum sulfate or polyamine dicyan low polymer is used within the range not impairing the effects of the present invention. A fixing agent such as can be used.

  As a method for producing the nonwoven fabric substrate (A), a method of impregnating a nonwoven fabric (a) with a colorant and drying (pigment exhaust dyeing method), a fiber forming the nonwoven fabric (a) is used with the colorant. And a method of producing a nonwoven fabric using the fibers after coloring and drying.

  Examples of the method for producing a nonwoven fabric using the colored fibers include known wet methods, and various paper machines using a circular net paper machine, a short net paper machine, a long net paper machine, an inclined short net paper machine, and the like. Law.

  The double-sided pressure-sensitive adhesive sheet of the present invention is not obtained simply by using the non-woven fabric substrate (A) having the predetermined total light transmittance, but on one side or both sides of the specific non-woven fabric substrate (A). And a pressure-sensitive adhesive layer (B1) containing a specific amount of one or more colorants (b1-2) selected from the group consisting of dyes. By combining the non-woven fabric substrate (A) and the pressure-sensitive adhesive layer (B1), a light-shielding property at a level capable of imparting a further excellent high design property, and an excellent adhesive force to the adherend, Both the holding force in the shear direction and the constant load holding force in the 90-degree direction can be achieved.

  As the pressure-sensitive adhesive layer (B1), it is preferable to use a pressure-sensitive adhesive layer having a total light transmittance of 80% or less measured according to JIS K7136, and 60% for imparting further design properties. It is more preferable to use a pressure-sensitive adhesive layer that is as follows, and it is even more preferable to use a pressure-sensitive adhesive layer that is 50% or less. The lower limit value of the total light transmittance of the pressure-sensitive adhesive layer (B1) has a further excellent design property, an excellent adhesion to the adherend, a holding force in the shear direction, and a constant load holding force in the 90-degree direction. In order to achieve both high dimensions, it is preferable that the content is 1% or more.

Examples of the pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive layer (B1) include the predetermined colorant (b1-2), the polymer (b1-1), and a solvent and a crosslinking agent as necessary. What is contained can be used.
Specifically, as the pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive (b1) containing a polymer (b1-1), the colorant (b1-2), a solvent, and a cross-linking agent as necessary, or A solvent-type pressure-sensitive adhesive or the like can be used, and the use of an emulsion-type pressure-sensitive adhesive is preferable from the viewpoint of reducing the environmental burden when producing a double-sided pressure-sensitive adhesive sheet.

  As the emulsion-type pressure-sensitive adhesive (b1), for example, a polymer (b1-1) and a colorant (b1-2) dispersed in a solvent such as an aqueous medium can be used.

As the polymer (b1-1) contained in the pressure-sensitive adhesive, for example, an acrylic polymer can be used.
As the acrylic polymer, for example, a polymer obtained by polymerizing a monomer containing a (meth) acrylate having a C 4-8 alkyl group and a vinyl monomer having a carboxyl group is used. Can do. By using the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, it is possible to further improve the adhesion, adherence in the shear direction, and maintain constant load in the 90 degree direction to the adherend. The provided adhesive layer (B1) can be formed.

  Examples of the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms include 2-ethylhexyl acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, isooctyl (meta ) (Meth) acrylates such as acrylate and n-octyl (meth) acrylate can be used. Among them, it is preferable to use 2-ethylhexyl acrylate and n-butyl acrylate. Particularly, the combined use of n-butyl acrylate and 2-ethylhexyl acrylate results in adhesion to the adherend and retention in the shear direction. It is more preferable for forming a pressure-sensitive adhesive layer having an even better adhesive force with respect to a constant load holding force in the 90-degree direction.

  The (meth) acrylate having an alkyl group having 4 to 8 carbon atoms is used in a range of 50% by mass to 99% by mass with respect to the total amount of monomers used for the production of the acrylic polymer. Is preferable, it is more preferably used in the range of 70% by mass to 98% by mass, and further preferably in the range of 90% by mass to 98% by mass.

  Examples of the vinyl monomer having a carboxyl group that can be used in the production of the acrylic polymer include acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, phthalic acid, phthalic anhydride, and crotonic acid. One kind or a combination of two or more kinds can be used. As the vinyl monomer having a carboxyl group, it is preferable to use acrylic acid and methacrylic acid, and in particular, it is possible to use a combination of acrylic acid and methacrylic acid. It is possible to form a pressure-sensitive adhesive layer having a holding force of 90 ° and a constant load holding force of 90 ° direction.

  The vinyl monomer having a carboxyl group is preferably used in the range of 0.5% by mass to 10% by mass with respect to the total amount of monomers used for the production of the acrylic polymer. More preferably, it is used in the range of 5% by mass to 5% by mass, and in the range of 1.5% by mass to 4% by mass, the cross-linking reaction with the cross-linking agent to be described later easily proceeds favorably. It is more preferable when forming a pressure-sensitive adhesive layer having excellent adhesive strength, shearing direction holding force, and 90 ° direction constant load holding force with respect to the adherend.

  When the acrylic monomer and methacrylic acid are used in combination as the vinyl monomer having a carboxyl group, the molar equivalent ratio of methacrylic acid and acrylic acid [methacrylic acid / acrylic acid] is preferably 0.2 or more, It is more preferably 1 or more, further preferably 2 or more, and particularly preferably 3 or more. The upper limit of the molar equivalent ratio of methacrylic acid and acrylic acid is 33. The pressure-sensitive adhesive layer has excellent adhesion to the adherend, holding power in the shear direction, and constant load holding power in the 90-degree direction. Is preferable in forming.

  As a monomer that can be used when the acrylic polymer is produced, other monomers can be used as necessary in addition to those described above.

  As said other monomer, methyl (meth) acrylate, ethyl (meth) acrylate etc. can be used, for example, C2 or less alkyl groups, such as methyl (meth) acrylate and ethyl (meth) acrylate, etc. It is particularly preferable to use a (meth) acrylate having a high molecular weight in order to form a pressure-sensitive adhesive layer having excellent constant load retention in the 90-degree direction.

  The (meth) acrylate having an alkyl group having 2 or less carbon atoms is preferably used in the range of 1% by mass to 10% by mass with respect to the total amount of monomers used for the production of the acrylic polymer. The use in the range of 3% by mass to 5% by mass is particularly preferable for forming a pressure-sensitive adhesive layer having excellent constant load holding force in the 90-degree direction.

  Moreover, as said other monomer, the vinyl monomer which has a nitrogen atom can be used. The vinyl monomer having a nitrogen atom is preferably used in combination with the vinyl monomer having a carboxyl group, particularly for forming a pressure-sensitive adhesive layer having excellent constant load retention in the 90-degree direction.

  Examples of the vinyl monomer having a nitrogen atom include N-vinylpyrrolidone, N-vinylpiperidone, N-vinylmorpholinone, N-vinylcaprolactam, N-cyclohexylmaleimide, N-butylmaleimide, N-phenylmaleimide, N -(Meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloylpyrrolidine, N- (meth) acryloyl-4-piperidone, acrylonitrile, (meth) acrylamide, N , N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N, N-methylene (Meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate Can be used alone or in combination of two or more, and N-vinylpyrrolidone is preferably used.

  The vinyl monomer having a nitrogen atom is preferably used in the range of 1% by mass to 5% by mass with respect to the total amount of monomers used for the production of the acrylic polymer, and 0.5% by mass. It is particularly preferable to use in the range of% to 1.5% by mass in forming a pressure-sensitive adhesive layer having excellent constant load holding force in the 90-degree direction.

  The use ratio (molar ratio) of the vinyl monomer having a nitrogen atom and the vinyl monomer having a carboxyl group is X as the number of moles of the vinyl monomer having a nitrogen atom, and the vinyl having the carboxyl group. It is preferable that the molar ratio X / Y when the number of moles of the monomer is Y is in the range of 0.05 to 1, more preferably in the range of 0.2 to 0.5. In particular, it is preferable for forming a pressure-sensitive adhesive layer excellent in a constant load holding force in the 90-degree direction.

  As said other monomer, in addition to what was mentioned above, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl as needed Vinyl monomers having a hydroxyl group such as (meth) acrylate; diacetone acrylamide, diacetone methacrylamide, acrolein, formyl styrene, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, diacetone acrylate, diacetone methacrylate, acetonitrile acrylate , Monomers having keto group or aldehyde group such as 2-hydroxypropyl acrylate acetoacetate and butanediol acrylate acetate; methylo such as N-methylolacrylamide It can be used a monomer having a Rhodia Nicca Ltd. Sipomer PAM-100, PAM-200, PAM-300 phosphate groups and the like; monomers having an Le group.

  As a method for producing the acrylic polymer, for example, in the case of producing an emulsion type acrylic pressure-sensitive adhesive in which the acrylic polymer is dispersed in an aqueous medium, the aforementioned monomer is polymerized by an emulsion polymerization method. The method of doing is mentioned. In the polymerization, various polymerization methods such as a batch charging method and a dropping method can be employed. More specifically, as the emulsion polymerization method, it is preferable to employ a method in which the monomer and the polymerization initiator are respectively added dropwise to a reaction vessel charged with an aqueous medium to perform emulsion polymerization.

  In carrying out the emulsion polymerization, an anionic emulsifier, a nonionic emulsifier, other dispersion stabilizers and the like can be used for the purpose of ensuring polymerization stability.

  Examples of the anionic emulsifier include sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and the like. As the nonionic emulsifier, for example, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and the like can be used.

  As the emulsifier, it is preferable to use an emulsifier having a polymerizable unsaturated group in the molecule, generally called “reactive emulsifier”. Examples of the reactive emulsifier include Latemul PD-104 [manufactured by Kao Corporation], Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd.], Adekaria Soap SE-10 [manufactured by ADEKA Corporation], Eleminol. And JS-20 [manufactured by Sanyo Chemical Industries, Ltd.]. Use of a reactive emulsifier is preferable because moisture resistance is improved in addition to polymerization stability.

  When manufacturing the said acrylic polymer, a polymerization initiator can be used as needed. Examples of the polymerization initiator include 4,4-azobis (4-cyanopentanoic acid), 2,2 ′,-azobis (2-methylpropionamidine) dihydrochloride, 2,2′-azobis (2-methylpropionamidine). ) Sulfate, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [N- (2-alkoxyethyl) -2-methylpropionamidine] hydrate, 2,2 '-Azobis (N, N'-dimethyleneisobutylamidine) dihydrochloride, 2,2'-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis [2 -(2-imidazolin-2-yl) propane] sulfate, 2,2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis [ 2- (5-Methyl 2-Imidazolin-2-yl) propane] sulfate, 2-2′-azobis [2- (3,4,5,6-tetrahydropyrimidin-2-yl) propane] dihydrochloride, 2,2′-azobis [2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane] dihydrochloride, azo initiators such as 2,2′-azobis (2-methylpropanamide oxime), persulfuric acid Persulfate initiators such as potassium, ammonium persulfate, sodium persulfate, peroxide initiators such as benzoyl peroxide, t-butyl hydroperoxide, hydrogen peroxide, and carbonyl initiators such as aromatic carbonyl compounds Redox initiators such as a combination of persulfate and sodium bisulfite, a combination of peroxide and sodium ascorbate, and the like can be used. Among these, the use of an azo initiator or a persulfate initiator is preferable because it has excellent polymerization stability and a desired adhesive performance is easily obtained.

  Moreover, when manufacturing the said acrylic polymer, a chain transfer agent can be used as needed for the purpose of adjusting the molecular weight of an acrylic polymer.

  As the chain transfer agent, for example, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol and the like can be used. .

  As the acrylic polymer obtained by the above method, it is preferable to use a polymer having a weight average molecular weight of 500,000 to 1,200,000, and it is preferable to use a polymer having a weight average molecular weight of 600,000 to 1,000,000. It is preferable for obtaining a double-sided pressure-sensitive adhesive sheet having an excellent adhesion to the adherend, a holding force in the shearing direction, and a constant load holding force in the 90-degree direction.

  The weight average molecular weight is a value obtained by standard gel conversion using gel permeation chromatography (GPC). As measurement conditions, TSKgel GMHXL [manufactured by Tosoh] was used as the column, the column temperature was 40 ° C., the eluent was tetrahydrofuran, the flow rate was 1.0 mL / min, and the standard polystyrene was TSK standard polystyrene.

  The average particle diameter of the acrylic polymer particles is not particularly limited, but is preferably 100 nm to 1000 nm, and 150 nm to 500 nm is agglomerated or settled even when stored for a long time. It is preferable because it is difficult to occur and has excellent dispersion stability. The average particle diameter refers to a 50% median diameter based on the volume of the emulsion particles, and the numerical values are based on values obtained by measurement by a dynamic light scattering method.

  Examples of the aqueous medium in which the acrylic polymer can be dispersed include water, organic solvents miscible with water, and mixtures thereof. Examples of the organic solvent miscible with water include alcohols such as methanol, ethanol, n-propanol and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol and propylene glycol; Alkyl ethers; lactams such as N-methyl-2-pyrrolidone, ethyl carbitol, ethyl cellosolve, butyl cellosolve, and the like. In the present invention, only water may be used, a mixture of water and an organic solvent miscible with water may be used, or only an organic solvent miscible with water may be used. From the viewpoint of safety and load on the environment, water alone or a mixture of water and an organic solvent miscible with water is preferable, and only water is particularly preferable.

Moreover, as the colorant (b1-2) contained in the pressure-sensitive adhesive layer (B1), the same colorants as exemplified as those usable when the nonwoven fabric substrate (A) is produced are used. For example, dyes such as direct dyes, reactive dyes, sulfur dyes, basic dyes, acid dyes, metal-containing acid dyes, indigo dyes, selenium dyes, disperse dyes, and cationic dyes; pigments such as organic pigments and inorganic pigments These can be used alone or in combination of two or more.
As the colorant (b1-2), a black colorant containing carbon black or the like is used for forming the pressure-sensitive adhesive layer (B1) having a total light transmittance of 1% to 80%. It is preferable to do.

  The pressure-sensitive adhesive layer (B1) has an excellent light-shielding property at a level capable of imparting a high design to the double-sided pressure-sensitive adhesive sheet, an excellent adhesion to the adherend, a holding force in the shear direction, and a constant load holding in the 90-degree direction. In order to balance the strength, the solid content of the colorant (b1-2) is included in the range of 0.1% by mass to 0.8% by mass with respect to the entire pressure-sensitive adhesive layer (B1). It is preferable to use, and it is more preferable to use what is contained in the range of 0.1% by mass to 0.5% by mass, and what is included in the range of 0.2% to 0.5% by mass is used. It is particularly preferable to do this.

  As an adhesive which can be used for formation of the said adhesive layer (B1), what contains tackifying resin other than what was mentioned above as needed can be used.

  As the tackifying resin, an emulsion type tackifying resin is preferably used if it is used for the emulsion type acrylic pressure-sensitive adhesive (b1).

  Examples of the emulsion-type tackifying resin include rosin-based tackifying resin, polymerized rosin-based tackifying resin, rosin ester-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin, and disproportionated rosin. An ester tackifier resin, a hydrogenated rosin ester tackifier resin, an acid-modified rosin tackifier resin, a terpene tackifier resin, a terpene phenol tackifier resin, a petroleum resin tackifier resin, or the like can be used. A rosin ester-based tackifier resin and a polymerized rosin ester-based tackifier resin for forming a pressure-sensitive adhesive layer having excellent adhesion to metal and plastic adherends and a constant load holding force in the 90-degree direction. A rosin phenol-based tackifier resin or a petroleum resin-based tackifier resin can be preferably used.

  Among these, as the emulsion type tackifying resin, it is preferable to use the polymerized rosin ester tackifying resin and the rosin phenol tackifying resin, and the polymerized rosin ester tackifying resin and the rosin phenol tackifying resin. Is particularly preferable for forming a more excellent pressure-sensitive adhesive layer with a constant load holding force in the 90-degree direction.

  The tackifying resin is preferably used in the range of 5 to 40 parts by mass with respect to 100 parts by mass of the resin (solid content) containing the acrylic polymer, and in the range of 10 to 30 parts by mass. Is preferably used for forming a pressure-sensitive adhesive layer having excellent adhesion to the adherend and a constant load holding force in the 90-degree direction.

  When the polymerized rosin ester-based tackifier resin and the rosin phenol-based tackifier resin are used in combination, the polymerized rosin ester-based tackifier resin ranges from 5 to 20 parts by mass, and the rosin phenol-based tackifier. It is preferable to use the resin in the range of 5 to 20 parts by mass, which is preferable for forming a pressure-sensitive adhesive layer having excellent adhesive force and constant load holding force with respect to the adherend. A particularly preferred combination is a combination of 10 parts by mass of the polymerized rosin ester-based tackifier resin and 10 parts by mass of the rosin phenol-based tackifier resin.

  As the tackifying resin, those having a softening point of 100 ° C to 180 ° C are preferably used, more preferably those having a softening point of 120 ° C to 180 ° C, and those having a softening point of 130 ° C to 180 ° C. It is more preferable to use one having a temperature of 140 ° C. to 170 ° C., particularly when forming a pressure-sensitive adhesive layer having an excellent constant load holding force in the 90 ° C. direction.

  The pressure-sensitive adhesive layer (B1) preferably has a crosslinked structure. Specifically, an article such as a punching tape is fixed using the double-sided pressure-sensitive adhesive tape of the present invention to produce an article, and when the article is left in a temperature environment of about 23 ° C. to 60 ° C., the punching In order to prevent the surface of the pressure-sensitive adhesive layer visually recognized through the through-holes of the sheet or the like from glaring over time and impairing the design properties of the article, a gel fraction of 30% by mass to 60% by mass is provided. It is preferable to have it.

  Examples of the crosslinking agent include known epoxy crosslinking agents, silane crosslinking agents, isocyanate crosslinking agents, aziridine crosslinking agents, polyvalent metal salt crosslinking agents, metal chelate crosslinking agents, keto-hydrazide crosslinking agents, and oxazolines. A system crosslinking agent, a carbodiimide system crosslinking agent, etc. can be used. The crosslinking agent may be supplied during the production of the polymer (b1), or may be supplied after the organic solvent solution of the polymer (b1) or an aqueous dispersion thereof is produced and used as an adhesive. .

  Especially, it is preferable to use an epoxy-type crosslinking agent, a silane-type crosslinking agent, and an isocyanate-type crosslinking agent as said crosslinking agent since it is easy to adjust the gel fraction of an adhesive layer (B1) to the above-mentioned range.

The preferred crosslinking agent does not proceed with the crosslinking reaction immediately after the formation of the pressure-sensitive adhesive layer (B1), but proceeds with the crosslinking reaction over a relatively long time. Therefore, the preferable cross-linking agent can advance the cross-linking reaction in a curing process that is often performed after forming the double-sided PSA sheet by transferring the PSA layer to the surface of the nonwoven fabric substrate (A). Therefore, there exists adhesiveness of a nonwoven fabric base material (A) and an adhesive layer (B1), and various adhesive performance can be improved further.
The cross-linking agent is supplied and used as an adhesive after the organic solvent solution of the polymer (b1-1) or an aqueous dispersion thereof is produced rather than the case where it is used during the production of the polymer (b1-1). It is preferable because the gel fraction can be easily adjusted to a desired range, and the adhesion between the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B1) and various pressure-sensitive adhesive properties can be further improved.

Examples of the epoxy-based crosslinking agent include Denacol EX-832 [manufactured by Nagase Kasei Kogyo Co., Ltd.], Denacol EX-841 [manufactured by Nagase Kasei Kogyo Co., Ltd.], Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd.], Tetrad X [Mitsubishi Gas Chemical Co., Ltd.] and the like can be used.
Examples of the silane crosslinking agent include β- (3,4-epoxycyclohexylethyltrimethoxysilane [Z-6043; manufactured by Toray Dow Corning Co., Ltd.], γ-glycidoxypropyltrimethoxysilane [Z-6040; Toray Dow Corning Co., Ltd.], γ-glycidoxypropylmethyldiethoxysilane [KBE-402; Shin-Etsu Silicone Co., Ltd.], γ-glycidoxypropyltriethoxysilane [KBE-403; Shin-Etsu Silicone ( Co., Ltd.], 3-methacryloxypropylmethyldimethoxysilane [Z-6033; manufactured by Toray Dow Corning Co., Ltd.], 3-methacryloxypropyltrimethoxysilane [Z-6030; manufactured by Toray Dow Corning Co., Ltd.] 3-methacryloxypropylmethyldiethoxysilane [KBE-502; Shin-Etsu Chemical Co., Ltd. , 3-methacryloxypropyltriethoxysilane [KBE-503; manufactured by Shin-Etsu Chemical Co., Ltd.], 3-acryloxypropyltrimethoxysilane [Z-6530; manufactured by Toray Dow Corning Co., Ltd.], etc. be able to.
As said isocyanate type crosslinking agent, Bernock DNW-5000 [made by DIC Corporation], Bernock DNW-5010 [made by DIC Corporation], Burnock DNW-5100 [made by DIC Corporation], Burnock DNW-5500 [DIC] AQUANATE 100 [Nippon Polyurethane Industry Co., Ltd.], AQUANATE 105 [Nippon Polyurethane Industry Co., Ltd.], AQUANATE 110 [Nippon Polyurethane Industry Co., Ltd.], AQUANATE 120 [Japan] Polyurethane Industry Co., Ltd.], Aquanate 130 [Nihon Polyurethane Industry Co., Ltd.], Aquanate 200 [Nihon Polyurethane Industry Co., Ltd.], Aquanate 210 [Nihon Polyurethane Industry Co., Ltd.], LS2319 Bayer Urethane Co., Ltd.], LS2336 [Sumika Bayer Urethane Co., Ltd.], Bayhydr 3100 [manufactured by Sumika Bayer Urethane Co., Ltd.] and the like can be used.

  The said crosslinking agent can be used in the range from which the gel fraction of an adhesive layer (B1) becomes a desired range. For example, if an epoxy-based crosslinking agent is used as the crosslinking agent, the epoxy-based crosslinking agent is used in a range of 0.01 parts by mass to 0.1 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferable to form a pressure-sensitive adhesive layer that is less likely to cause a reduction in matting properties over time. In addition, when a silane crosslinking agent is used as the crosslinking agent, the silane crosslinking agent is in a range of 0.005 parts by mass to 0.5 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferable to use it in order to form a pressure-sensitive adhesive layer that is unlikely to cause a reduction in matting properties over time. If an isocyanate crosslinking agent is used as the crosslinking agent, the isocyanate crosslinking agent is used in the range of 0.005 to 0.5 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferable to form a pressure-sensitive adhesive layer that is less likely to cause a reduction in matting properties over time.

  As the pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive layer (B1), one having a solid content in the range of 40% by mass to 70% by mass is used for the purpose of further improving the dispersion stability. It is preferable to do.

  Examples of the pressure-sensitive adhesive that can be used to form the pressure-sensitive adhesive layer (B1) include a base (such as ammonia water and amines), an acid, a plasticizer, a softener, an antioxidant, and the like for adjusting pH as necessary. Using fillers such as glass and plastic fibers, balloons, beads, metal powders, film formation aids, leveling agents, wetting agents, thickeners (viscosity modifiers), water repellents, antifoaming agents, etc. Also good. It is preferable to use them in the range of 0% by mass to 1% by mass, respectively.

The pressure-sensitive adhesive layer (B1) preferably has a thickness in the range of 50 μm to 200 μm, more preferably in the range of 80 μm to 180 μm, and a range of 100 μm to 150 μm. More preferably.
Yes. When the double-sided pressure-sensitive adhesive sheet has the pressure-sensitive adhesive layer (B1) on both sides of the nonwoven fabric substrate (A), the total thickness of the double-sided pressure-sensitive adhesive layers (B1) is within the above range. However, it is preferable because the light shielding property and the adhesion performance can be balanced.

  The double-sided pressure-sensitive adhesive sheet of the present invention is prepared by, for example, applying the pressure-sensitive adhesive using a roll coater or a die coater on one side or both sides of the predetermined nonwoven fabric substrate (A), and drying the double-sided pressure-sensitive adhesive sheet. The double-sided pressure-sensitive adhesive sheet can be produced by a method of laminating an uneven matte release liner on the surface of the pressure-sensitive adhesive layer (B1) constituting the double-sided pressure-sensitive adhesive sheet (so-called direct coating method).

  In addition, the double-sided pressure-sensitive adhesive sheet of the present invention forms the pressure-sensitive adhesive layer (B) by applying the pressure-sensitive adhesive on the surface of the matte release liner in advance using a roll coater or a die coater, and drying. Next, it can also manufacture by the method of transcribe | transferring the said adhesive layer (B) to a nonwoven fabric base material (A) (so-called transfer method).

  The double-sided pressure-sensitive adhesive sheet produced by any of the above methods is then cured for 48 hours or more in the range of 20 ° C. to 50 ° C. in order to adjust the gel fraction of the pressure-sensitive adhesive layer (B1) to the predetermined range. Is preferable.

The double-sided pressure-sensitive adhesive sheet of the present invention may have the pressure-sensitive adhesive layer (B1) on both sides of the nonwoven fabric substrate (A), but it is difficult to impair the design of the article, such as polystyrene or polycarbonate. The adhesive layer (B1) is provided on one surface of the non-woven fabric substrate (A) for improving the adhesiveness to the adherend, the adhesiveness to the curved surface, the constant load holding force, and the like. It is preferable to have an adhesive layer (B2) on the surface.
The pressure-sensitive adhesive layer (B2) preferably has an initial glossiness of 100% or less, more preferably 10% to 80%, and a gel fraction of the pressure-sensitive adhesive layer (B2) of preferably 20%. The range is from mass% to 90 mass%, more preferably from 30 mass% to 45 mass%.
The pressure-sensitive adhesive layer (B2) uses a pressure-sensitive adhesive containing the polymer (b2-1) and, if necessary, one or more colorants (b2-2) selected from the group consisting of pigments and dyes. It is a pressure-sensitive adhesive layer formed.
As the pressure-sensitive adhesive layer (B2), it is preferable to use a pressure-sensitive adhesive layer having a total light transmittance of 80% or less measured according to JIS K7136, and 60% for imparting further design properties. It is more preferable to use a pressure-sensitive adhesive layer that is as follows, and it is even more preferable to use a pressure-sensitive adhesive layer that is 50% or less. The lower limit value of the total light transmittance of the pressure-sensitive adhesive layer (B2) has a further excellent design property, an excellent adhesion to the adherend, a holding force in the shear direction, and a constant load holding force in the 90-degree direction. In order to achieve both high dimensions, it is preferable that the content is 1% or more.

The pressure-sensitive adhesive that can be used to form the pressure-sensitive adhesive layer (B2) includes the polymer (b2-1) and, if necessary, the colorant (b2-2), a solvent, a crosslinking agent, and the like. Can be used.
Specifically, the pressure-sensitive adhesive is an emulsion-type pressure-sensitive adhesive containing the polymer (b2-1), the colorant (b2-2) as necessary, a solvent, and a cross-linking agent as necessary. An agent (b2), a solvent-type pressure-sensitive adhesive, or the like can be used, and the use of an emulsion-type pressure-sensitive adhesive is preferable in terms of reducing the environmental burden when producing a double-sided pressure-sensitive adhesive sheet.

  As the emulsion-type pressure-sensitive adhesive (b2), for example, a polymer (b2-1) and a colorant (b2-2) dispersed in a solvent such as an aqueous medium can be used.

As a polymer (b2-1) contained in the said adhesive, the thing similar to the said polymer (b2-1) can be used. Moreover, as a solvent contained in the said adhesive, it is using the thing similar to solvents, such as an aqueous medium illustrated as what can be used for the adhesive which can be used when manufacturing the said adhesive layer (B1). it can.
As an adhesive which can be used for formation of the said adhesive layer (B2), what contains tackifying resin other than what was mentioned above as needed can be used.

  As said tackifier resin, the thing similar to what was illustrated as what can be used for the adhesive which can be used when manufacturing the said adhesive layer (B1) can be used.

  The pressure-sensitive adhesive layer (B2) preferably has a crosslinked structure. Specifically, when the double-sided pressure-sensitive adhesive tape of the present invention is used to fix an adherend such as a punching tape to manufacture an article, and the article is fixed to a housing of a television, radio, personal computer, etc., the article is In order to make it difficult to peel off from the casing, the gel fraction is preferably 20% by mass to 90% by mass, and more preferably 30% by mass to 45% by mass.

  As said crosslinking agent, the thing similar to what was illustrated as what can be used for the adhesive which can be used when manufacturing the said adhesive layer (B1) can be used.

  The said crosslinking agent can be used in the range from which the gel fraction of an adhesive layer (B2) becomes a desired range. For example, if an epoxy crosslinking agent is used as the crosslinking agent, the epoxy crosslinking agent is used in a range of 0.01 to 0.3 parts by mass with respect to 100 parts by mass of the acrylic polymer. Preferably, 0.01 parts by weight to 0.15 parts by weight is more preferable with respect to 100 parts by weight of the acrylic polymer, and 0.01 parts by weight with respect to 100 parts by weight of the acrylic polymer. 0.1 parts by mass is even more preferable, and it is used in the range of 0.01 parts by mass to 0.04 parts by mass, because it has poor adhesion to adherends, adhesion to curved surfaces, constant load holding force, etc. It is particularly preferable for improvement. In addition, when a silane crosslinking agent is used as the crosslinking agent, the silane crosslinking agent is in a range of 0.005 parts by mass to 0.5 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferably used, and it is used in the range of 0.005 to 0.3 parts by mass with respect to 100 parts by mass of the acrylic polymer. In view of improving the properties, the constant load holding force and the like, it is particularly preferable. If an isocyanate crosslinking agent is used as the crosslinking agent, the isocyanate crosslinking agent is used in the range of 0.005 to 0.5 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is preferable that it is used in the range of 0.005 parts by mass to 0.3 parts by mass with respect to 100 parts by mass of the acrylic polymer. It is particularly preferable when the constant load holding force is improved.

  The pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive layer (B2) has a solid content in the range of 40% by mass to 70% by mass for the purpose of further improving dispersion stability. It is preferable to do.

The pressure-sensitive adhesive layer (B2) preferably has a thickness in the range of 50 μm to 200 μm, more preferably in the range of 80 μm to 180 μm, and a range of 100 μm to 150 μm. It is more preferable in terms of improving the adhesion to an adherend that is difficult to adhere, the adhesion to a curved surface, the constant load holding force, and the like.
Yes.

  In the double-sided pressure-sensitive adhesive sheet of the present invention, for example, the pressure-sensitive adhesive layer (B2) is formed by applying the pressure-sensitive adhesive on one side of the predetermined nonwoven fabric substrate (A) using a roll coater, a die coater or the like and drying. (So-called direct coating method).

  In addition, the double-sided pressure-sensitive adhesive sheet of the present invention forms the pressure-sensitive adhesive layer (B2) by applying the pressure-sensitive adhesive on the surface of the matte release liner in advance using a roll coater, a die coater or the like, and drying. Next, the pressure-sensitive adhesive layer (B2) can also be produced by a method of transferring to one surface of the nonwoven fabric substrate (A) (so-called transfer method).

  The double-sided pressure-sensitive adhesive sheet produced by any of the above methods is then cured for 48 hours or more in the range of 20 ° C. to 50 ° C. to adjust the gel fraction of the pressure-sensitive adhesive layer (B2) to the predetermined range. Is preferable.

  Moreover, the double-sided pressure-sensitive adhesive sheet of the present invention uses an adhesive layer (B1) constituting the double-sided pressure-sensitive adhesive sheet having an initial glossiness of 20% or less. By using a pressure-sensitive adhesive layer having the initial glossiness within the range, it is possible to exhibit good matting properties.

  As the pressure-sensitive adhesive layer (B1), it is preferable to use a pressure-sensitive adhesive layer having an initial glossiness of 0.1% to 10% in order to impart further design properties.

  The initial glossiness is determined according to JIS Z 8741 by applying a gloss meter [Konica Minolta Co., Ltd., Model: GM-268Plus] to the surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet in an environment of 23 ° C. and 50% RH. It is a value measured at a measurement angle of 60 degrees. When a release liner is laminated on the double-sided pressure-sensitive adhesive sheet, the value is measured using the gloss meter immediately after the release liner is removed.

  In order to adjust the initial glossiness of the pressure-sensitive adhesive layer (B1) within the desired range, the surface of the pressure-sensitive adhesive layer is preferably provided with an uneven structure.

  As the concavo-convex structure of the pressure-sensitive adhesive layer, the maximum height (Ry) of the convex portion is preferably 3 μm to 20 μm, and preferably 10 μm to 16 μm, to adhere to an adherend such as a punching sheet. It is more preferable to provide excellent matting properties without impairing the properties.

In addition, the maximum height (Ry) of the convex part of the pressure-sensitive adhesive layer means that the surface of the pressure-sensitive adhesive layer is a color 3D laser microscope [manufactured by Keyence Co., Ltd., model: VK-9500], and the lens magnification is 50. The maximum height (Ry) value measured at any point (200 μm in length and 250 μm in width) with the magnification, the measurement mode being ultra-deep, the pitch being 0.05 μm, and the optical zoom being 1.0 times It is.

  Moreover, as an uneven | corrugated structure of the said adhesive layer, it is preferable that surface roughness (Ra) is 0.1 micrometer-5 micrometers, it is more preferable that they are 0.3 micrometer-3 micrometers, and they are 1 micrometer-2.5 micrometers. It is particularly preferable for providing excellent matting properties without impairing adhesion to an adherend such as a punching sheet.

  The surface roughness of the pressure-sensitive adhesive layer is a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, This is the value of arithmetic average roughness (Ra) obtained by measuring the surface of a release liner measuring 200 μm in length and 250 μm in width at an arbitrary position with an optical zoom of 1.0.

Further, as the concavo-convex structure of the pressure-sensitive adhesive layer, the number of convex portions is preferably 100 to 1600 per 1 mm ² , and 300 to 900 is preferably an adherend such as a punching sheet. It is particularly preferable in order to provide excellent matting properties without impairing the adhesion to the surface.

  In addition, the number of convex parts of the pressure-sensitive adhesive layer is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500], with a lens magnification of 2.5 times, at an arbitrary location, It is the number of convex portions having a height of 1 μm or more, which is obtained by observing and counting the surface of the pressure-sensitive adhesive layer 1 μm in length and 1 μm in width.

  Moreover, as an uneven | corrugated structure of the said adhesive layer, it is with respect to adherends, such as a punching sheet, that the area of a convex part occupies 50%-90% with respect to the total area of an adhesive layer. It is particularly preferable in order to provide an excellent matte property without impairing the adhesive property.

In addition, the area occupied by the convex portion is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500], and the lens magnification is 2.5 times. This is a value obtained by observing the surface of a 1 μm square adhesive layer and calculating the ratio of the area of the convex portion having a height of 1 μm or more with respect to the total area (1 μm ² ) observed.

  In order to provide the pressure-sensitive adhesive layer with a concavo-convex structure, it is preferable to use a release liner that has been embossed.

  As the release liner subjected to the embossing, the maximum depth (Ry) of the concave portion is preferably 3 μm to 20 μm, and preferably 10 μm to 16 μm with respect to an adherend such as a punching sheet. It is more preferable in providing excellent matting properties without impairing adhesiveness.

  The maximum depth of the concave portion is a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], lens magnification is 50 times, measurement mode is ultra-deep, pitch is 0.05 μm, optical zoom Is the maximum depth (Ry) value obtained by measuring the surface of a release liner measuring 200 μm in length and 250 μm in width at an arbitrary position.

  Moreover, as a release liner which gave the said embossing, it is preferable that surface roughness (Ra) is 0.1 micrometer-5 micrometers, it is more preferable that they are 0.3 micrometer-3 micrometers, and 1 micrometer-2.5 micrometers. It is particularly preferable for providing excellent matting properties without impairing adhesion to an adherend such as a punching sheet.

  The surface roughness is a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], lens magnification is 50 times, measurement mode is ultra-deep, pitch is 0.05 μm, and optical zoom is 1 The value of arithmetic mean roughness (Ra) obtained by measuring the surface of a release liner having a length of 200 μm and a width of 250 μm square at an arbitrary position as 0.0.

Further, as the release liner subjected to the embossing, the number of concave portions provided on the surface is preferably 100 to 1600 per 1 mm ² , and is preferably 300 to 900. In order to provide excellent matting properties without impairing adhesion to an adherend such as the above, it is particularly preferable.

  In addition, the number of the concave portions is 1 μm in length and 1 μm in width at an arbitrary position using a surface shape measuring device [Toray Engineering Co., Ltd., model: SP-500], with a lens magnification of 2.5 times. This is the number of recesses having a depth of 1 μm or more observed and counted on the surfaces of the release liners on all sides.

  Moreover, as for the release liner subjected to the embossing, the area of the concave portion provided on the surface occupies 50% to 90% with respect to the total area of the release liner. It is particularly preferable for providing excellent matteness without impairing the adhesion to the body.

The area occupied by the concave portion is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500]. This is a value obtained by observing the surface of the release liner of 1 μm square and calculating the ratio of the area of the recess having a height of 1 μm or more with respect to the total area (1 μm ² ) observed.

The double-sided pressure-sensitive adhesive sheet of the present invention obtained by the above method can be used exclusively for applications requiring good light-shielding properties, high design properties, and matte properties.
Therefore, the double-sided pressure-sensitive adhesive sheet of the present invention has excellent constant load holding power in addition to good light-shielding properties. It can be suitably used for the purpose of fixing a decorative member such as a sheet.

  Next, the present invention will be described in detail with reference to examples and comparative examples. The evaluation method of each characteristic of the double-sided PSA sheet obtained in Examples and Comparative Examples is as follows.

[Measurement method of total light transmittance of nonwoven fabric substrate]
A non-woven fabric substrate is cut into a square having a length of 50 mm and a width of 50 mm (area 2500 mm ² ) to produce a test piece, and a reflection / transmittance meter HR-100 type [manufactured by Murakami Color Research Laboratory Co., Ltd.] The total light transmittance was measured according to JIS K 7136.

[Measurement method of basis weight of nonwoven fabric substrate]
A non-woven fabric substrate was cut into a square having a length of 1000 mm and a width of 1000 mm (area 1 m ² ) to produce a test piece. The mass of was measured. The basis weight was calculated according to the following formula.

Basis weight (g / m ² ) = mass (g) / area (m ² )

[Measurement method of total light transmittance of pressure-sensitive adhesive layer]
The water-dispersed acrylic pressure-sensitive adhesive obtained in Preparation Example was applied to a smooth release liner, dried in an environment of 100 ° C., and moisture was removed, thereby preparing a pressure-sensitive adhesive layer having a thickness of 65 μm.
After peeling off the release liner, the total light transmittance of the pressure-sensitive adhesive layer was measured according to JIS K 7136 using a reflection / transmittance meter HR-100 type [manufactured by Murakami Color Research Laboratory Co., Ltd.].

[Measurement method of total light transmittance of double-sided PSA sheet]
A test piece was prepared by cutting the double-sided PSA sheets obtained in Examples and Comparative Examples into squares having an area of 25 cm ² . After peeling off the release liners on both sides of the test piece, the total light transmittance of the test piece was measured using a reflection / transmittance meter HR-100 type [manufactured by Murakami Color Research Laboratory Co., Ltd.] JIS K 7136. Measured according to

[Measurement method of maximum height of convex part of adhesive layer]
The surface of the pressure-sensitive adhesive layer was subjected to a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification was 50 times, the measurement mode was ultra-deep, the pitch was 0.05 μm, and the optical zoom was 1. The value of the maximum height (Ry) was measured at an arbitrary place (vertical 200 μm, horizontal 250 μm) as 0 times.

[Method for measuring surface roughness (arithmetic mean roughness) of adhesive layer]
The surface of the pressure-sensitive adhesive layer was subjected to a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification was 50 times, the measurement mode was ultra-deep, the pitch was 0.05 μm, and the optical zoom was 1. The value of arithmetic average roughness (Ra) was measured at an arbitrary position (vertical 200 μm, horizontal 250 μm) as 0 times.

[Method for measuring the number of convex portions of the pressure-sensitive adhesive layer]
The surface of the pressure-sensitive adhesive layer was observed at an arbitrary position (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. Then, the number of convex portions having a height of 1 μm or more was counted.

[Measurement method of area occupied by convex part of adhesive layer]
The surface of the pressure-sensitive adhesive layer was observed at an arbitrary location (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. And the area of the convex part from which height becomes 1 micrometer or more was measured. The ratio of the area of the convex part with a height of 1 μm or more was calculated with respect to the total area (1 mm ² ).

[Measurement method of maximum depth of recess in release liner]
Using a color 3D laser microscope (manufactured by Keyence Corporation, model: VK-9500) on the surface of the release liner, the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, and the optical zoom is 1. The value of the maximum depth (Ry) was measured at an arbitrary place (vertical 200 μm, horizontal 250 μm) as 0 times.

[Measurement method of surface roughness (arithmetic mean roughness) of release liner]
Using a color 3D laser microscope (manufactured by Keyence Corporation, model: VK-9500) on the surface of the release liner, the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, and the optical zoom is 1. The value of arithmetic average roughness (Ra) was measured at an arbitrary position (vertical 200 μm, horizontal 250 μm) as 0 times.

[Method for measuring the number of recesses in the release liner]
The surface of the release liner is observed at an arbitrary location (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. Then, the number of recesses having a depth of 1 μm or more was counted.

[Measurement method of the area occupied by the concave portion of the release liner]
The surface of the release liner is observed at an arbitrary location (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. Then, the area of the concave portion having a depth of 1 μm or more was measured. The ratio of the area of the concave portion having a depth of 1 μm or more with respect to the total area (1 mm ² ) was calculated.

[Measurement method of gel fraction]
What cut | disconnected the double-sided adhesive sheet obtained by the Example and the comparative example to the magnitude | size (area 20cm < ² >) of length 50mm and width 40mm was used as the test piece. Note that before the production of the double-sided pressure-sensitive adhesive sheet was measured mass of nonwoven substrate used for the production of (G ₀₎ in advance.
Next, the mass (G ₁ ) of the test piece was measured. Next, the test piece was immersed in toluene at room temperature for 24 hours, and then filtered through a 300-mesh wire mesh to separate a residue that was insoluble in toluene and dried at 105 ° C. for 1 hour. The mass (G2) of the residue was measured. Wherein the mass of non-woven fabric substrate (G _0), and the mass of the before immersion of the test piece (G _1), the value of the residue mass (G _2), according to the following formula, was calculated gel fraction.

Gel fraction (% by mass) = [(G ₂ −G ₀ ) / (G ₁ −G ₀ )] × 100

[Measurement method of glossiness (1) of adhesive layer]
The glossiness (1) of the pressure-sensitive adhesive layer was measured according to JIS Z 8741.
The double-sided PSA sheets obtained in Examples and Comparative Examples were cut into a size of 80 mm in length and 20 mm in width as a test piece. Immediately after removing the release liner on the measurement side of the test piece in an environment of 23 ° C., the glossiness of the surface of the pressure-sensitive adhesive layer (1) was measured using a gloss meter [manufactured by Konica Minolta, model: GM-268Plus]. ) Was measured. As a measurement condition, the measurement angle was fixed at 60 degrees.

[Measurement method of glossiness (2) of adhesive layer]
Similarly to the above, the glossiness (2) of the pressure-sensitive adhesive layer was measured in accordance with JIS Z 8741.
The double-sided PSA sheets obtained in Examples and Comparative Examples were cut into a size of 80 mm in length and 20 mm in width as a test piece. After peeling off the release liner on the side to be measured of the test piece and leaving it in an environment of 40 ° C. for 500 hours, using a gloss meter [Konica Minolta, Model: GM-268Plus], the surface of the adhesive layer The glossiness (2) was measured. As a measurement condition, the measurement angle was fixed at 60 degrees.

[Evaluation method of designability (1)]
The release liners of the double-sided pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples were peeled off, and the surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet was visually observed under an environment of indoor lighting of 500 lux. The observations were made by 5 evaluators. Of the evaluations by the five evaluators, the most evaluated result was the design evaluation of the double-sided PSA sheet.
The surface of the pressure-sensitive adhesive layer has a deep and deep color tone and excellent jetness, “◎”, the darkness is slightly low but practically black, “◯”, clearly black The light color (gray) that was slightly inferior in quality was evaluated as “Δ”, and the color on the back surface of the double-sided PSA sheet was confirmed as “x”.

[Evaluation Method for Designability (2) (Evaluation of Matting Property)]
The release liners of the double-sided PSA sheets obtained in Examples and Comparative Examples are peeled off and bonded to a punching sheet having a through hole with a diameter of 1 mm and an aperture ratio of 40%, and then punched in an environment of indoor lighting of 500 lux The LED lamp illumination of 210 lumens was applied from the direction perpendicular to the sheet surface, and the degree of glare due to the reflection of light from the through-hole on the punching sheet surface was visually observed. Of the evaluations by the five evaluators, the most evaluated result was the design evaluation of the double-sided PSA sheet.
“◎” indicates that glare due to light reflection from the through-hole on the punching sheet surface is not visually recognized, “○” indicates that glare is hardly visible and does not impair the design, and “glare” is visually recognized. The case where the designability was slightly impaired was evaluated as “Δ”, and the case where glare was visually recognized and the designability was greatly impaired was evaluated as “x”.

[Measurement method of adhesive strength (180 ° peel adhesive strength)]
The 180 ° peel adhesive strength was measured according to JIS Z 0237.
A double-sided PSA sheet obtained in Examples and Comparative Examples is backed by attaching a polyethylene terephthalate (PET) film with a thickness of 25 μm to the adhesive layer on one side and cut into a size of 300 mm in length and 20 mm in width Was used as a test piece.
The test piece was placed on the adherend so that the other pressure-sensitive adhesive layer of the test piece was in contact with the surface of the adherend that was a stainless steel plate (SUS304 steel plate), a polycarbonate plate, or a polystyrene plate. In an environment of 50% RH, they were pasted by pressurizing and reciprocating once with a 2 kg roller.
The patch was allowed to stand in an environment of 23 ° C. and 50% RH for 1 hour, and then the test piece was rotated 180 degrees from the adherend using a Tensilon tensile tester [manufactured by A & D Corporation, model: RTM-100]. The adhesive strength when peeled at a speed of 300 m / min was measured. The higher the measured value, the better the adhesion performance.

[Measurement method of constant load holding force in 90 ° direction]
A double-sided PSA sheet obtained in the Examples and Comparative Examples was backed by attaching a polyethylene terephthalate (PET) film with a thickness of 25 μm to the adhesive layer on one side and cut into a size of 100 mm in length and 10 mm in width Was used as a test piece.
Next, in an environment of 23 ° C. and 50% RH, each adherend that is a stainless steel plate (SUS304 steel plate), a polycarbonate plate, or a polystyrene plate is placed on the surface of the other adhesive layer of the test piece. The test piece and the adherend were pasted by applying 8 reciprocating pressures using a 2 kg roller (pasting area; length 50 mm × width 10 mm).
After the patch is left in an environment of 23 ° C. and 50% RH for 1 hour, a surface of the adherend constituting the patch is horizontally placed on a constant load holding force meter (manufactured by Tester Sangyo Co., Ltd.). And fixed so as to be the upper surface. Next, a 0.1 kg weight was attached to the end of the test piece constituting the patch, and a load of 0.1 kg was applied in a 90 ° direction with respect to the length direction of the patch.
The time [unit: minute] until the test piece dropped from the patch was measured. The higher the measured value, the better the adhesion performance. Those held for 3 hours or more are designated as “「 ”, held for 1 hour or more and dropped in less than 3 hours as“ ◯ ”, held for 30 minutes or more and dropped in less than 1 hour as“ △ ” Those that dropped in less than 30 minutes were evaluated as “x”.

[Measurement method of holding force in shear direction]
The holding force was measured according to JIS Z 0237.
A test piece obtained by backing an aluminum foil having a thickness of 50 μm on the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples, and cutting it into a length of 100 mm and a width of 20 mm. It was.
Next, in an environment of 23 ° C. and 50% RH, a stainless steel plate (SUS304 steel plate) was placed on the surface of the pressure-sensitive adhesive layer (B2) of the test piece so that the pasting area was 20 mm × 20 mm. They were attached by reciprocating pressure using a 2 kg roller.
The patch was allowed to stand in an environment of 23 ° C. and 50% RH for 1 hour, and then in a 70 ° C. environment, the patch was placed on a holding force meter with a thermostatic bath [Tester Sangyo Co., Ltd. (Direction) was fixed so as to be perpendicular to the horizontal. Next, a load of 0.5 kg was applied in the shearing direction of the patch by attaching a weight of 0.5 kg to the end of the test piece constituting the patch. The time until the test piece fell from the patch was measured. In addition, the test piece which did not fall after 1440 minutes (24 hours) passed was described as 1440 <. The higher the measured value, the better the adhesion performance.

(Preparation Example 1)
<Preparation of emulsion>
In a container, 75 g of ion-exchanged water and Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25% by mass] as a surfactant and Latem PD-104 [Kao Co., Ltd .; active ingredient 20% by mass] 37.5 g was added and dissolved uniformly. Thereto, 237.5 g of n-butyl acrylate, 237.5 g of 2-ethylhexyl acrylate, 15 g of methyl methacrylate, 10 g of acrylic acid, and 0.2 g of lauryl mercaptan were added and emulsified to obtain 632.7 g of an emulsion.

<Preparation of aqueous dispersion of water-dispersed acrylic polymer>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 333.5 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part of the emulsion prepared above [7.59 g], 2.5 g of ammonium persulfate aqueous solution [6% by mass of active ingredient], 2.5 g of sodium hydrogen sulfite aqueous solution [6% by mass of active ingredient] were added, Polymerization was performed in 1 hour while maintaining 60 ° C. Subsequently, the remaining emulsion (625.11 g) and ammonium persulfate aqueous solution (50 g [active ingredient 1% by mass]) were added dropwise over 6 hours using a separate funnel while keeping the reaction vessel at 60 ° C. After completion of the dropwise addition, the reaction vessel was stirred for 1 hour while maintaining the temperature at 60 ° C. Next, 5 g [active ingredient 2% by mass] of sodium erythorbate aqueous solution was dropped and polymerized over 1 hour using another funnel, and then stirred for 1 hour while maintaining the reaction vessel at 60 ° C. Then, the contents were cooled and adjusted with aqueous ammonia (active ingredient 10% by mass) so that the pH was 7.5. This was filtered with a 200-mesh wire mesh to obtain an aqueous dispersion (1) [solid content concentration of 50% by mass] of an aqueous dispersion type acrylic copolymer. The acrylic copolymer had an average particle size of 339 nm and a weight average molecular weight of 670,000.

<Preparation of water-dispersed acrylic pressure-sensitive adhesive composition>
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point 160, to 1000 g of the aqueous dispersion (1) of the water-dispersed acrylic polymer described above, as a tackifier resin. ℃, solid content concentration 50% by mass] 200 g, Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan (as an antifoaming agent) 2.5 g) was added.
After mixing them, 4 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. Subsequently, 10 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and water-dispersed acrylic adhesive An agent composition (1) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (1) was 7.4%.

(Preparation Example 2)
A water-dispersed acrylic pressure-sensitive adhesive composition (2) was obtained in the same manner as in Preparation Example 1, except that the blending amount of PSM black C as the colorant was changed from 10 g to 6 g. The total light transmittance of the 65 μm-thick adhesive layer prepared using the water-dispersed acrylic pressure-sensitive adhesive composition (2) was 19.5%.

(Preparation Example 3)
A water-dispersed acrylic pressure-sensitive adhesive composition (3) was obtained in the same manner as in Preparation Example 1, except that the blending amount of PSM black C as the colorant was changed from 10 g to 4 g. The total light transmittance of the 65 μm thick pressure-sensitive adhesive layer prepared using the water-dispersed acrylic pressure-sensitive adhesive composition (3) was 29.2%.

(Preparation Example 4)
A water-dispersed acrylic pressure-sensitive adhesive composition (4) was obtained in the same manner as in Preparation Example 1, except that the blending amount of PSM black C as a colorant was changed from 10 g to 2 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the water-dispersed acrylic adhesive composition (4) was 51.6%.

(Preparation Example 5)
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion type polymerized rosin ester type tackifying resin, softening point 160 ° C., 1000 g of water dispersion type acrylic polymer aqueous dispersion (1) Solid content concentration 50% by mass] 100 g, Tamanol E-200NT [manufactured by Arakawa Chemical Industry Co., Ltd .; emulsion type rosin phenol-based tackifying resin, softening point 150 ° C., solid content concentration 53% by mass] 94.34 g, as leveling agent Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g and Surfynol DF-110D [manufactured by Air Products Japan Co., Ltd.] 2.5 g were added as an antifoaming agent.
After mixing them, 4 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. Subsequently, 6 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and water-dispersed acrylic adhesive An agent composition (5) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water-dispersed acrylic adhesive composition (5) was 19.3%.

(Preparation Example 6)
Superester NS-121 [made by Arakawa Chemical Industries, Ltd .; emulsion-type rosin ester-based tackifier resin, softening point 125 ° C., solids in 1000 g of water-dispersed acrylic polymer aqueous dispersion (1) Partial concentration 50% by mass] 200 g, Surfinol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [manufactured by Air Products Japan Co., Ltd.] as an antifoaming agent ] 2.5 g was added.
After mixing them, 4 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. Subsequently, 6 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and water-dispersed acrylic adhesive An agent composition (6) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (6) was 19.2%.

(Preparation Example 7)
<Preparation of emulsion>
In a container, 75 g of ion-exchanged water and Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25% by mass] as a surfactant and Latem PD-104 [Kao Co., Ltd .; active ingredient 20% by mass] 37.5 g was added and dissolved uniformly. Thereto, 235 g of n-butyl acrylate, 235 g of 2-ethylhexyl acrylate, 15 g of methyl methacrylate, 5 g of N-vinylpyrrolidone, 10 g of acrylic acid and 0.2 g of lauryl mercaptan were added and emulsified to obtain 632.7 g of an emulsion.

<Preparation of aqueous dispersion of water-dispersed acrylic copolymer>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 333.5 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part of the emulsion prepared above [7.59 g], 2.5 g of ammonium persulfate aqueous solution [6% by mass of active ingredient], 2.5 g of sodium hydrogen sulfite aqueous solution [6% by mass of active ingredient] were added, Polymerization was performed in 1 hour while maintaining 60 ° C. Subsequently, the remaining emulsion (625.11 g) and ammonium persulfate aqueous solution (50 g [active ingredient 1% by mass]) were added dropwise over 6 hours using a separate funnel while keeping the reaction vessel at 60 ° C. After completion of the dropwise addition, the reaction vessel was stirred for 1 hour while maintaining the temperature at 60 ° C. Next, 5 g [active ingredient 2% by mass] of sodium erythorbate aqueous solution was dropped and polymerized over 1 hour using another funnel, and then stirred for 1 hour while maintaining the reaction vessel at 60 ° C. Then, the contents were cooled and adjusted with aqueous ammonia (active ingredient 10% by mass) so that the pH was 7.5. This was filtered through a 200-mesh wire mesh to obtain an aqueous dispersion (2) [solid content concentration of 50% by mass] of an aqueous dispersion acrylic polymer. The acrylic copolymer had an average particle size of 338 nm and a weight average molecular weight of 670,000.

<Preparation of water-dispersed acrylic pressure-sensitive adhesive composition>
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point to 1000 g of aqueous dispersion (2) of the above-mentioned water-dispersed acrylic copolymer; 160 ° C., solid content concentration 50% by mass] 200 g, Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan] as an antifoaming agent Made by Co., Ltd.] 2.5 g was added.
After mixing them, 4 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. Subsequently, 6 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and water-dispersed acrylic adhesive An agent composition (7) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (7) was 19.7%.

(Preparation Example 8)
<Preparation of emulsion>
In a container, 75 g of ion-exchanged water and Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25% by mass] as a surfactant and Latem PD-104 [Kao Co., Ltd .; active ingredient 20% by mass] 37.5 g was added and dissolved uniformly. 229 g of n-butyl acrylate, 229 g of 2-ethylhexyl acrylate, 25 g of methyl methacrylate, 5 g of N-vinylpyrrolidone, 2 g of acrylic acid, 10 g of methacrylic acid and 0.2 g of lauryl mercaptan were added to emulsify, and 632.7 g of the emulsion was obtained. Obtained.

<Preparation of aqueous dispersion of water-dispersed acrylic copolymer>
In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, a thermometer, and a dropping funnel, 333.5 g of ion-exchanged water was added, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part of the emulsion prepared above [7.59 g], 2.5 g of ammonium persulfate aqueous solution [6% by mass of active ingredient], 2.5 g of sodium hydrogen sulfite aqueous solution [6% by mass of active ingredient] were added, Polymerization was performed in 1 hour while maintaining 60 ° C. Subsequently, the remaining emulsion (625.11 g) and ammonium persulfate aqueous solution (50 g [active ingredient 1% by mass]) were added dropwise over 6 hours using a separate funnel while keeping the reaction vessel at 60 ° C. After completion of the dropwise addition, the reaction vessel was stirred for 1 hour while maintaining the temperature at 60 ° C. Next, 5 g [active ingredient 2% by mass] of sodium erythorbate aqueous solution was dropped and polymerized over 1 hour using another funnel, and then stirred for 1 hour while maintaining the reaction vessel at 60 ° C. Then, the contents were cooled and adjusted with aqueous ammonia (active ingredient 10% by mass) so that the pH was 7.5. This was filtered through a 200-mesh wire mesh to obtain an aqueous dispersion (3) [solid content concentration of 50% by mass] of an aqueous dispersion type acrylic copolymer. The acrylic copolymer had an average particle size of 300 nm and a weight average molecular weight of 630,000.

<Preparation of water-dispersed acrylic pressure-sensitive adhesive composition>
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point to 1000 g of the aqueous dispersion (3) of the water-dispersed acrylic copolymer described above as a tackifier resin 160 ° C., solid content concentration 50% by mass] 200 g, Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan] as an antifoaming agent Made by Co., Ltd.] 2.5 g was added.
After mixing them, 4 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. Subsequently, 6 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and water-dispersed acrylic adhesive An agent composition (8) was obtained. The total light transmittance of the 65 μm thick pressure-sensitive adhesive layer prepared using the water-dispersed acrylic pressure-sensitive adhesive composition (8) was 19.6%.

(Preparation Example 9)
A water-dispersed acrylic pressure-sensitive adhesive composition (9) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 1 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (9) was 19.5%.

(Preparation Example 10)
A water-dispersed acrylic pressure-sensitive adhesive composition (10) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 1.5 g. The total light transmittance of the 65 μm thick pressure-sensitive adhesive layer prepared using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (10) was 19.5%.

(Preparation Example 11)
A water-dispersed acrylic pressure-sensitive adhesive composition (11) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 2 g. The total light transmittance of the 65 μm thick pressure-sensitive adhesive layer prepared using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (11) was 19.5%.

(Preparation Example 12)
A water-dispersed acrylic pressure-sensitive adhesive composition (12) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 2.5 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (12) was 19.5%.

(Preparation Example 13)
A water-dispersed acrylic pressure-sensitive adhesive composition (13) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 3.5 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (13) was 19.5%.

(Preparation Example 14)
A water-dispersed acrylic pressure-sensitive adhesive composition (14) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 4.5 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion-type acrylic adhesive composition (14) was 19.5%.

(Preparation Example 15)
A water-dispersed acrylic pressure-sensitive adhesive composition (15) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 6 g. The total light transmittance of the 65 μm thick pressure-sensitive adhesive layer prepared using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (15) was 19.5%.

(Preparation Example 16)
A water-dispersed acrylic pressure-sensitive adhesive composition (16) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 7.5 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion-type acrylic adhesive composition (16) was 19.5%.

(Preparation Example 17)
A water-dispersed acrylic pressure-sensitive adhesive composition (17) was obtained in the same manner as in Preparation Example 2, except that the 10% by mass ethanol solution of tetrad C as a crosslinking agent was changed from 4 g to 9 g. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion-type acrylic adhesive composition (17) was 19.5%.

(Preparation Example 18)
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point 160 ° C. to 1000 g of water-dispersed acrylic copolymer (1) 1000 g , Solid content concentration 50% by mass] 200 g, Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan Co., Ltd.] as an antifoaming agent )] 2.5 g was added. After stirring them uniformly, 1.5 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. This was filtered with a 200 mesh wire mesh to obtain a water-dispersed acrylic pressure-sensitive adhesive composition (18). In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water-dispersed acrylic adhesive composition (18) was 88.6%.

(Preparation Example 19)
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point 160 ° C. to 1000 g of water-dispersed acrylic copolymer (1) 1000 g , Solid content concentration 50% by mass] 200 g, Surfynol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan Co., Ltd.] as an antifoaming agent )] 2.5 g was added. After stirring them uniformly, 1.5 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. After filtering this through a 200-mesh wire mesh, 30 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] is added as a colorant, and the mixture is stirred for 1 hour. As a result, a water-dispersed acrylic pressure-sensitive adhesive composition (19) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion type acrylic adhesive composition (19) was 0.2%.

(Preparation Example 20)
1000 g of an aqueous dispersion of an aqueous dispersion type acrylic copolymer (1), 2.5 g of Surfinol PSA-336 [manufactured by Air Products Japan Co., Ltd.] as a leveling agent, and Surfynol DF-110D as an antifoaming agent [Air Products Japan Co., Ltd.] 2.5 g was added. After stirring them uniformly, 1 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent and stirred for 1 hour. After filtering this through a 200-mesh wire mesh, 60 g of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] is added as a colorant, and stirred for 1 hour. As a result, a water-dispersed acrylic pressure-sensitive adhesive composition (20) was obtained. In addition, the total light transmittance of the 65-micrometer-thick adhesive layer prepared using the obtained water dispersion-type acrylic adhesive composition (20) was 0.0%.

  The formulation table for the above preparation examples is shown in the table below. “Mass%” of the monomer composition in the table represents the amount of each monomer used relative to the total amount of monomer components constituting the acrylic copolymer, and “mass part” of the tackifier resin represents the acrylic copolymer. It represents the mass part of the tackifier resin with respect to 100 parts by mass of the polymer, “mass part” of the crosslinking agent represents the mass part of the crosslinking agent with respect to 100 parts by mass of the acrylic copolymer, and “mass part” of the colorant represents This represents the mass part of carbon black as a colorant with respect to 100 parts by mass of the acrylic copolymer.

Example 1
The water-dispersed acrylic pressure-sensitive adhesive composition (1) obtained in Preparation Example 1 was applied to a mat-like release liner (1) having a concavo-convex shape (product name: WHKR-65FNR modified, manufactured by Lintec Corporation). The pressure-sensitive adhesive sheet (M1-) was coated on the surface of the side so that the thickness after drying was 65 μm and dried at 100 ° C. for 5 minutes to provide the surface of the matte release liner with the pressure-sensitive adhesive layer. 1) was obtained.
Next, the water-dispersed acrylic pressure-sensitive adhesive composition (10) obtained in Preparation Example 10 was used as a semi-mirror of a semi-mirror release liner (4) [manufactured by Sumika Kogyo Co., Ltd., trade name: DLS-78WTL]. The pressure-sensitive adhesive sheet (S1) provided with a pressure-sensitive adhesive layer on the surface of the semi-mirror-like release liner was coated on the surface of the control side so that the thickness after drying was 65 μm and dried at 100 ° C. for 5 minutes. -10) was obtained.
Next, the pressure-sensitive adhesive sheet (M1-1) is applied to one side of a nonwoven fabric substrate (1) dyed with a black pigment [manufactured by Nippon Paper Papillia Co., Ltd., trade name: synthetic fiber black, pulp / rayon mixed paper]. The pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet (S1-10) was transferred to the other surface to obtain a double-sided pressure-sensitive adhesive sheet. In addition, the gel fraction of the adhesive layer after the curing of the adhesive sheet (M1-1) was 55.2% by mass. Moreover, the gel fraction of the adhesive layer after curing of the said adhesive sheet (S1-10) was 33.7 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 0.1%. Moreover, it was 15.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 2.22 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400 and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.
Moreover, it was 28.7% when the total light transmittance of the said nonwoven fabric base material (1) was measured by the above-mentioned method, and it was 14 g / m < ² > when the basic weight was measured by the above-mentioned method.
Moreover, when the maximum depth of the concave portion of the release liner (1) was measured by the above method, it was 17.8 μm, and when the surface roughness of the release liner (1) was measured by the above method, 2.18 μm, and the number of recesses of the release liner (1) was measured by the method described above. As a result, it was 400, and the area occupied by the recesses of the release liner (1) was measured by the method described above. However, it was 20%. Further, when the depth of the concave portion of the release liner (4) was measured by the above method, it was 0.6 μm, and when the surface roughness of the release liner (4) was measured by the above method, 0 was obtained. 0.09 μm, and when the number of concave portions of the release liner (4) was measured by the method described above, it was zero, and the area occupied by the concave portions of the release liner (4) was measured by the method described above. 0%.

(Example 2)
In the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive composition (2) obtained in Preparation Example 2 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M1-2) having an adhesive layer on the surface of a matte release liner was prepared.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M1-2) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M1-2) was 55.1 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 1.1%. Moreover, it was 15.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 2.20 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400, and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 3)
In the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive composition (3) obtained in Preparation Example 3 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M1-3) having an adhesive layer on the surface of a matte release liner was prepared.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M1-3) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M1-3) was 55.0 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 2.4%. Moreover, it was 15.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 2.19 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

Example 4
In the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive composition (4) obtained in Preparation Example 4 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M1-4) having an adhesive layer on the surface of a matte release liner was prepared.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M1-4) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M1-4) was 54.7 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 7.6%. Moreover, it was 15.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 2.18 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400 and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 5)
Example 1 except that instead of the nonwoven fabric substrate (1), a nonwoven fabric substrate (2) dyed with a black pigment [manufactured by Shirakawa Paper Co., Ltd., trade name: thin paper top color, pulp papermaking] was used. A double-sided PSA sheet was obtained in the same manner. Moreover, the total light transmittance of the obtained double-sided pressure-sensitive adhesive sheet was 0.1%. Moreover, it was 15.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 2.21 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.
Moreover, when the total light transmittance of the said nonwoven fabric base material (2) was measured by the above-mentioned method, it was 20.3%, and when the basic weight was measured by the above-mentioned method, it was 14 g / m < ² >.

(Example 6)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 2 except that the nonwoven fabric substrate (2) was used instead of the nonwoven fabric substrate (1). Moreover, the total light transmittance of the obtained double-sided pressure-sensitive adhesive tape was 1.0%. Moreover, it was 15.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 2.24 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400, and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 7)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 3 except that the nonwoven fabric substrate (2) was used instead of the nonwoven fabric substrate (1). Moreover, the total light transmittance of the obtained double-sided pressure-sensitive adhesive tape was 2.1%. Moreover, it was 15.8 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 2.23 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 8)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 4 except that the nonwoven fabric substrate (2) was used instead of the nonwoven fabric substrate (1). Moreover, the total light transmittance of the obtained double-sided pressure-sensitive adhesive tape was 6.8%. Moreover, it was 15.7 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 2.24 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400, and the both surfaces It was 20% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

Example 9
Instead of the mat-like release liner (1) having irregularities, a mat-like release liner (2) having irregularities [manufactured by Sumika Kogyo Co., Ltd., trade name: DLS-78WTL (S mat)] A pressure-sensitive adhesive sheet (M2-1) having a pressure-sensitive adhesive layer on the surface of a matte release liner was obtained in the same manner as in Example 1 except that was used.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M2-1) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-1) was 55.2 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 0.1%. Moreover, it was 3.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.51 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.
Further, when the depth of the concave portion of the release liner (2) was measured by the above method, it was 3.6 μm, and when the surface roughness of the release liner (2) was measured by the above method, 0 was obtained. When the number of concave portions of the release liner (2) was measured by the method described above, it was 400, and the area occupied by the concave portions of the release liner (2) was measured by the method described above. 35%.

(Example 10)
A matte release liner was prepared in the same manner as in Example 2 except that the matte release liner (2) having the unevenness was used instead of the matte release liner (1) having the unevenness. An adhesive sheet (M2-2) having an adhesive layer on its surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M2-2) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-2) was 55.1 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 1.1%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 0.52 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400 and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 11)
A matte release liner was prepared in the same manner as in Example 3 except that the matte release liner (2) having the unevenness was used instead of the matte release liner (1) having the unevenness. An adhesive sheet (M2-3) having an adhesive layer on its surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M2-3) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-3) was 55.0 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 2.0%. Moreover, it was 3.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

Example 12
The matte release liner was prepared in the same manner as in Example 4 except that the matte release liner (2) having irregularities was used instead of the matte release liner (1) having irregularities. An adhesive sheet (M2-4) having an adhesive layer on the surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M2-4) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-4) was 54.7 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 6.9%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.53 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 13)
A double-sided PSA sheet was obtained in the same manner as in Example 5 except that the PSA sheet (M2-1) was used instead of the PSA sheet (M1-1).
The obtained double-sided PSA sheet had a total light transmittance of 0.1%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.54 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 14)
A double-sided PSA sheet was obtained in the same manner as in Example 6 except that the PSA sheet (M2-2) was used instead of the PSA sheet (M1-2).
The total light transmittance of the obtained double-sided PSA sheet was 1.0%. Moreover, it was 3.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 15)
A double-sided PSA sheet was obtained in the same manner as in Example 7 except that the PSA sheet (M2-3) was used instead of the PSA sheet (M1-3).
The obtained double-sided PSA sheet had a total light transmittance of 1.9%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.53 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 16)
A double-sided PSA sheet was obtained in the same manner as in Example 8, except that the PSA sheet (M2-4) was used instead of the PSA sheet (M1-4).
The obtained double-sided PSA sheet had a total light transmittance of 6.6%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 17)
Instead of the mat-like release liner (1) having irregularities, a mat-like release liner (3) having irregularities (product name: KNP-78 Shiro (HO-R2), manufactured by LINTEC Corporation) is used. A pressure-sensitive adhesive sheet (M3-1) having a pressure-sensitive adhesive layer on the surface of a matte release liner was obtained in the same manner as in Example 1 except that it was used.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M3-1) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M3-1) was 55.2 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 0.1%. Moreover, it was 2.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.28 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 200, and the both surfaces It was 18% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.
Further, the depth of the concave portion of the release liner (3) was measured by the method described above, and it was 2.3 μm. The surface roughness of the release liner (3) was measured by the method described above, and 0 .27 μm and the number of recesses of the release liner (3) measured by the method described above was 196, and the area occupied by the recesses of the release liner (3) was measured by the method described above. 18%.

(Example 18)
A mat-like release liner in the same manner as in Example 2 except that the mat-like release liner (3) having the unevenness was used instead of the mat-like release liner (1) having the unevenness. An adhesive sheet (M3-2) having an adhesive layer on the surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M3-2) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M3-2) was 55.1 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 1.1%. Moreover, it was 2.3 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 0.27 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 200, and the both surfaces It was 18% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 19)
The matte release liner was prepared in the same manner as in Example 3 except that the matte release liner (3) having the irregularities was used instead of the matte release liner (1) having the irregularities. An adhesive sheet (M3-3) having an adhesive layer on the surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M3-3) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M3-3) was 55.0 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 2.0%. Moreover, it was 2.3 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.28 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 200, and the both surfaces It was 18% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 20)
A matte release liner was prepared in the same manner as in Example 4 except that the matte release liner (3) having the unevenness was used instead of the matte release liner (1) having the unevenness. An adhesive sheet (M3-4) having an adhesive layer on its surface was obtained.
A double-sided PSA sheet was prepared in the same manner as in Example 1 except that the PSA sheet (M3-4) was used instead of the PSA sheet (M1-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M3-4) was 54.7 mass%.
The obtained double-sided PSA sheet had a total light transmittance of 6.9%. Moreover, it was 2.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-described method, it was 0.29 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 200, and the both surfaces It was 18% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 21)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (5) obtained in Preparation Example 5 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-5) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-5) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-5) was 55.4 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.4%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 22)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (6) obtained in Preparation Example 6 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-6) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-6) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-6) was 55.3 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.1%. Moreover, it was 3.3 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.57 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 23)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (7) obtained in Preparation Example 7 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-7) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-7) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-7) was 54.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.3%. Moreover, it was 3.2 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.56 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 24)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (8) obtained in Preparation Example 8 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-8) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-8) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-8) was 54.4 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.5%. Moreover, it was 3.3 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.57 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 25)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (9) obtained in Preparation Example 9 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-9) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-9) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-9) was 29.6 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.0%. Moreover, it was 3.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.56 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 26)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (10) obtained in Preparation Example 10 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-10) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-10) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-10) was 33.7 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.1%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 27)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (11) obtained in Preparation Example 11 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-11) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-11) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-11) was 40.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.1%. Moreover, it was 3.6 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.50 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 28)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (12) obtained in Preparation Example 12 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-12) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-12) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-12) was 47.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.0%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 0.52 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400 and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 29)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (13) obtained in Preparation Example 13 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-13) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-13) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-13) was 52.6 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.2%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.53 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 30)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (14) obtained in Preparation Example 14 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-14) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-14) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-14) was 58.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 0.9%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.53 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 31)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (15) obtained in Preparation Example 15 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-15) having an adhesive layer on the surface of a matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-15) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-15) was 63.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.2%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.51 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 32)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (16) obtained in Preparation Example 15 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-16) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-16) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-16) was 70.6 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.0%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.54 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Example 33)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (17) obtained in Preparation Example 15 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-17) having an adhesive layer on the surface of the matte release liner was obtained.
A double-sided PSA sheet was obtained in the same manner as in Example 9 except that the PSA sheet (M2-17) was used instead of the PSA sheet (M2-1). In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-17) was 76.9 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 1.1%. Moreover, it was 3.3 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 1)
In the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive composition (4) obtained in Preparation Example 4 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (10), A pressure-sensitive adhesive sheet (S1-4) having a pressure-sensitive adhesive layer on the surface of a semi-mirror-like release liner was obtained.
Next, instead of the nonwoven fabric substrate (1), the nonwoven fabric substrate (3) [Daifuku Paper Co., Ltd., pulp / rayon mixed paper] is used, instead of the adhesive sheet (S1-10), A double-sided PSA sheet was obtained in the same manner as in Example 12 except that the PSA sheet (S1-4) was used. In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (S1-4) was 54.7 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 25.1%. Moreover, it was 3.5 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.55 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.
Moreover, it was 73.3% when the total light transmittance of the said nonwoven fabric base material (3) was measured by the above-mentioned method, and it was 14 g / m < ² > when the basic weight was measured by the above-mentioned method.

(Comparative Example 2)
In the same manner as in Example 12, except that the semi-mirror release liner (3) was used instead of the matte release liner (2), an adhesive was applied to the surface of the semi-mirror release liner. The adhesive sheet (S1-4) provided with the layer was obtained.
A double-sided PSA sheet was obtained in the same manner as in Comparative Example 1 except that the PSA sheet (S1-4) was used instead of the PSA sheet (M2-4).
The total light transmittance of the obtained double-sided PSA sheet was 25.1%. Moreover, when the maximum height of the convex part of the adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 0.6 μm, and the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was When the surface roughness was measured by the above-described method, it was 0.09 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 0, and the both surfaces It was 0% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 3)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (18) obtained in Preparation Example 18 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-18) having an adhesive layer on the surface of the matte release liner was obtained.
Next, the same as Comparative Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive composition (18) obtained in Preparation Example 18 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (4). By the method, the adhesive sheet (S1-18) provided with the adhesive layer on the surface of the semi-mirror tone release liner was obtained.
A comparison was made except that the adhesive sheet (M2-18) was used instead of the adhesive sheet (S1-4), and the adhesive sheet (S1-18) was used instead of the adhesive sheet (S1-4). A double-sided PSA sheet was obtained in the same manner as in Example 1. In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-18) was 54.5 mass%. Moreover, the gel fraction of the adhesive layer after curing of the said adhesive sheet (S1-18) was also 54.5 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 82.5%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.50 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 4)
A double-sided PSA sheet was obtained in the same manner as in Comparative Example 3 except that the PSA sheet (S1-18) was used instead of the PSA sheet (M2-18).
The total light transmittance of the obtained double-sided PSA sheet was 82.5%. Moreover, when the maximum height of the convex part of the adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 0.6 μm, and the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was When the surface roughness was measured by the above-described method, it was 0.08 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 0, and the both surfaces It was 0% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 5)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (19) obtained in Preparation Example 19 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-19) having an adhesive layer on the surface of the matte release liner was obtained.
Next, the same as in Comparative Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive composition (19) obtained in Preparation Example 19 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (4). By the method, the adhesive sheet (S1-19) provided with the adhesive layer on the surface of the semi-mirror tone release liner was obtained.
A comparison was made except that the pressure-sensitive adhesive sheet (M2-19) was used instead of the pressure-sensitive adhesive sheet (M2-4), and the pressure-sensitive adhesive sheet (S1-19) was used instead of the pressure-sensitive adhesive sheet (S1-4). A double-sided PSA sheet was obtained in the same manner as in Example 1. In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-19) was 55.5 mass%. Moreover, the gel fraction of the adhesive layer after curing of the said adhesive sheet (S1-19) was also 55.5 mass%.
Moreover, the total light transmittance of the obtained double-sided pressure-sensitive adhesive sheet was 0.0%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the method described above, it was 0.51 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400, and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 6)
A double-sided PSA sheet was obtained in the same manner as in Comparative Example 5, except that the PSA sheet (S1-19) was used instead of the PSA sheet (M2-19).
The total light transmittance of the obtained double-sided PSA sheet was 0.0%. Moreover, it was 0.5 micrometer when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-described method, it was 0.09 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 0, and the both surfaces It was 0% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 7)
In the same manner as in Example 9, except that the water-dispersed acrylic pressure-sensitive adhesive composition (20) obtained in Preparation Example 20 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), An adhesive sheet (M2-20) having an adhesive layer on the surface of a matte release liner was obtained.
Next, the same as Comparative Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive composition (20) obtained in Preparation Example 20 was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (4). By the method, the adhesive sheet (S1-20) provided with the adhesive layer on the surface of the semi-mirror tone release liner was obtained.
A comparison was made except that the pressure-sensitive adhesive sheet (M2-20) was used instead of the pressure-sensitive adhesive sheet (M2-4), and the pressure-sensitive adhesive sheet (S1-20) was used instead of the pressure-sensitive adhesive sheet (S1-4). A double-sided PSA sheet was obtained in the same manner as in Example 1. In addition, the gel fraction of the adhesive layer after curing of the said adhesive sheet (M2-20) was 55.7 mass%. Moreover, the gel fraction of the adhesive layer after curing of the said adhesive sheet (S1-20) was also 55.7 mass%.
The total light transmittance of the obtained double-sided PSA sheet was 0.0%. Moreover, it was 3.4 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-mentioned method, it was 0.52 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 400 and the both surfaces It was 35% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

(Comparative Example 8)
A double-sided PSA sheet was obtained in the same manner as in Comparative Example 7, except that the PSA sheet (S1-20) was used instead of the PSA sheet (M2-20).
The total light transmittance of the obtained double-sided PSA sheet was 0.0%. Moreover, it was 0.5 micrometer when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method, and the adhesive layer (B1) of the said double-sided adhesive sheet When the surface roughness was measured by the above-described method, it was 0.07 μm, and when the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the above-described method, it was 0. It was 0% when the area which the convex part of the adhesive layer (B1) of an adhesive sheet occupied by the above-mentioned method was measured.

  The following table shows the results of the above evaluations on the nonwoven fabric substrates, release liners, and produced double-sided PSA sheets used in Examples and Comparative Examples.

  As is clear from the above table, the pressure-sensitive adhesive sheets of the present invention shown in Examples 1 to 33 have good design properties and matting properties, have excellent adhesion and holding power, and have good peeling resistance. Secured. On the other hand, the pressure-sensitive adhesive sheets of Comparative Examples 1 to 4 have poor design properties, and the pressure-sensitive adhesive sheets of Comparative Example 2, Comparative Example 4, Comparative Example 6, and Comparative Example 8 have poor matting properties. The pressure-sensitive adhesive sheet was inferior in the constant load holding force and poor in peel resistance.

Claims (12)

A double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer (B1) on one side or both sides of a nonwoven fabric substrate (A) having a total light transmittance of 5% to 70% measured according to JIS K7136, wherein the pressure-sensitive adhesive layer ( The initial glossiness of the surface of B1) is 20% or less, and the pressure-sensitive adhesive layer (B1) is one or more colorants (b1) selected from the group consisting of a polymer (b1-1), a pigment and a dye. -2) is a layer formed using an emulsion-type acrylic pressure-sensitive adhesive or a solvent-type acrylic pressure-sensitive adhesive, and the colorant (b1-2) is 0 with respect to the whole pressure-sensitive adhesive layer (B1). A double-sided pressure-sensitive adhesive sheet, which is contained in a range of 1% by mass to 1% by mass and has a total light transmittance of 0.1 to 10% measured according to JIS K7136. The surface of the pressure-sensitive adhesive layer (B1) has an uneven shape, and there are 100 to 1600 convex portions having a height of 1 μm or more per 1 mm ² of the surface area of the pressure-sensitive adhesive layer (B1). Item 2. The double-sided pressure-sensitive adhesive sheet according to item 1. The double-sided pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the pressure-sensitive adhesive layer (B1) has a gel fraction in the range of 30% by mass to 60% by mass. A double-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer (B1) on one surface of the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B2) on the other surface, wherein the pressure-sensitive adhesive layer (B2) The both surfaces according to any one of claims 1 to 3, wherein the glossiness of the surface is 100% or less, and the gel fraction of the pressure-sensitive adhesive layer (B2) is in the range of 20% by mass to 90% by mass. Adhesive sheet. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the nonwoven fabric substrate (A) is colored. The double-sided pressure-sensitive adhesive sheet according to claim 1, having a total thickness of 200 μm or less. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive layer (B1) is formed using an emulsion type acrylic pressure-sensitive adhesive. The pressure sensitive adhesive layer (B1) contains a (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, a vinyl monomer having a carboxyl group, and a vinyl monomer having a nitrogen atom. 8. A pressure-sensitive adhesive layer formed by using an acrylic copolymer obtained by polymerizing a body component, a pigment, and an emulsion-type acrylic pressure-sensitive adhesive containing a tackifying resin having a softening point of 140 ° C. or higher. Double-sided pressure-sensitive adhesive sheet as described in 1. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 8, which is used for fixing a decorative member. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 8, which is used for fixing a punching sheet. An article obtained by fixing a punching sheet to a housing using the double-sided pressure-sensitive adhesive sheet according to claim 10. The article according to claim 11, wherein the punching sheet is obtained using polycarbonate.