JP2000248241A - Pressure-sensitive double-sided adhesive tape and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject adhesive tape with high tackiness and high heat resistance compatible with each other, excellent in operability such as thick film coatability and photocurability, and to provide a method for producing the above adhesive tape. SOLUTION: This pressure-sensitive double-sided adhesive tape is obtained by the following process: using a photocurable tack agent consisting mainly of a (meth)acrylic alkyl ester monomer, a polar group-contg. monomer, a photoactive functional group-bearing acrylic polymer, and a photopolymerization initiator, and a base material layer composition comprising the above photocurable tack agent and a filler, or the like, a sheet substrate is coated with a tack agent layer, a base material layer and a tack agent layer, successively, followed by light irradiation to polymerize the photocurable tack agent layer of three-layer structure, wherein the photoactive functional group-contg. acrylic polymer to be used is a polymer 200,000-3000,000 in weight-average molecular weight and 0.001-0.5 meq/g in photoactive functional group content.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic pressure-sensitive double-sided adhesive tape and a method for producing the same, and more particularly, to achieving both high tackiness and high heat resistance, and at the same time, thick film coating and ultraviolet curability. TECHNICAL FIELD The present invention relates to an acrylic pressure-sensitive double-sided adhesive tape having excellent properties and a method for producing the same.

[0002]

2. Description of the Related Art In industries such as the electric and electronic fields, the construction and civil engineering fields, and automobile-related fields, as products become more sophisticated, more functional, and more diversified, adhesives and adhesives used for joining parts are used. Demands for agents such as high heat resistance, high adhesiveness, and high reliability are increasing.

Particularly, in recent years, from the viewpoint of improving workability and work environment, a tape-shaped or sheet-shaped pressure-sensitive adhesive (hereinafter, "pressure-sensitive adhesive" is referred to as "adhesion") instead of a liquid adhesive. There are many cases where various parts are joined by using a metal. Further, the purpose of use of the pressure-sensitive adhesive sheet is not only used for temporary fixing so far, but also used for permanent bonding.

[0004] From the viewpoint of ease of waste treatment, the use of adhesive tape is increasing in place of the conventional mechanical joining, and the tape thickness is relatively large.
An adhesive tape having a thickness of 0.5 to 2 mm is desired.

Conventionally, as a method for producing an adhesive tape, a water-based adhesive such as a solvent-type adhesive or an emulsion is applied onto a base material such as a polyester film or paper, and then the solvent is volatilized by heating. The method of crosslinking and curing has been adopted.

However, solvent-based pressure-sensitive adhesive tapes that have been conventionally used for curing by heating are insufficient in heat resistance and reliability after bonding. -268784, JP-A-9
No. 137142) has been developed.

However, even with such an ultraviolet-curable pressure-sensitive adhesive tape, it is possible to obtain an adhesive tape which has both high adhesiveness and high heat resistance and is excellent in workability such as thick film coating property and ultraviolet curability. It was difficult, and the development of materials and processes to achieve the solution was desired.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to achieve both high tackiness and high heat resistance, and to achieve thick film coating and ultraviolet light. An object of the present invention is to provide an adhesive tape excellent in workability such as curability and a method for producing the same.

[0009]

Means for Solving the Problems In order to achieve the above object, the present inventors have studied various materials and processes, and as a result,
Photocurable pressure-sensitive adhesive mainly composed of (meth) acrylic acid alkyl ester monomer, polar group-containing monomer, acrylic polymer having photoactive functional group and photopolymerization initiator is placed on the sheet substrate. The pressure-sensitive double-sided adhesive tape produced by coating and polymerizing it by light irradiation achieves both high tackiness and high heat resistance, and also has excellent workability such as thick film coating properties and ultraviolet curability. Was found.

The acrylic high molecular weight material having a photoactive functional group used herein has a weight average molecular weight of 200,000 to 3,000,000 and a photoactive functional group content of 0.001 to 0,0. It was found that those having 5 meq / g were good, and it was confirmed that a pressure-sensitive double-sided adhesive tape produced using a photocurable pressure-sensitive adhesive containing the same exhibited excellent adhesive properties.

That is, by using the above-mentioned photocurable pressure-sensitive adhesive, it is possible to obtain a pressure-sensitive adhesive tape which is excellent in tackiness and heat resistance and excellent in workability such as thick film coating property.

Hereinafter, a method for producing the material and the pressure-sensitive adhesive tape used in the present invention will be described.

The acrylic high molecular weight material having a photoactive functional group is used not only for improving the heat resistance of the pressure-sensitive adhesive tape but also for improving the workability such as thick film coating property. The acrylic high molecular weight material having a photoactive functional group used in the present invention has a weight average molecular weight of 20.
And a photoactive functional group content of 0.001 to 3,000,000.
Acrylic high molecular weights of up to 0.5 meq / g are preferred.

As a method for introducing a photoactive functional group into an acrylic high molecular weight polymer, a hydroxyl group in a side chain of the acrylic high molecular weight polymer is usually replaced with a (meth) acryloyloxy group, for example, 2-methacryloyloxy. There is a method of reacting with an isocyanate compound such as ethyl isocyanate. In this way, an acrylic high molecular weight substance having a photoactive functional group such as a (meth) acryloyloxy group can be obtained. However, the introduction method is not particularly limited.

In the case where the weight average molecular weight of the acrylic high molecular weight compound having a photoactive functional group is smaller than 200,000,
In order to obtain a high-viscosity PSA composition of several thousand to several tens of thousands cp in consideration of thick film coating properties and the like, it is necessary to increase the amount of the acrylic polymer having a photoactive functional group to be added. is there.
As a result, the adhesive tape has excellent adhesive properties (specifically,
It is not preferable because it is impossible to achieve both heat resistance (specifically, a holding force at 150 ° C.) of 5 kgf / 25 mm or more with respect to a stainless steel substrate. When the weight average molecular weight is more than 3,000,000, the pressure-sensitive adhesive tape is not particularly problematic in terms of characteristics, but it is difficult to mass-produce an acrylic high molecular weight substance, which is not preferable.

When the content of the photoactive functional group of the acrylic high molecular weight product having the photoactive functional group is less than 0.001 meq / g, the holding power of the pressure-sensitive adhesive tape at 150 ° C. becomes poor, Further, the content of the photoactive functional group is 0.5
If it is larger than meq / g, the adhesive strength of the adhesive tape to the stainless steel substrate will be lower than 5 kgf / 25 mm, which is not preferable in any case. The amount of the acrylic polymer having a photoactive functional group in the pressure-sensitive adhesive composition is adjusted according to the desired pressure-sensitive adhesive properties and the viscosity at the time of coating. Used at 10 to 50% by weight.

The main component of the acrylic high molecular weight substance having a photoactive functional group is usually a copolymer of a (meth) acrylic acid alkyl ester monomer and a polar group-containing monomer, for example, acrylic Copolymers of 2-ethylhexyl acrylate and 2-hydroxyethyl methacrylate, terpolymers of isooctyl acrylate, acrylic acid and 2-hydroxyethyl methacrylate, and the like are used, but are not particularly limited thereto. Not something.

The alkyl (meth) acrylate monomer used in the present invention includes, for example, ethyl group, propyl group, butyl group, pentyl group, hexyl group, 2-ethylhexyl group, octyl group, Usually, esters of (meth) acrylic acid having an alkyl group having 20 or less carbon atoms, such as an isooctyl group, a nonyl group, an isononyl group, and a decyl group, are exemplified. The above-mentioned alkyl (meth) acrylate is used alone or in combination of two or more. In the present invention,
Part of the alkyl (meth) acrylate may be replaced with a copolymerizable monomer such as vinyl acetate.

The polar group-containing monomer used in the present invention includes acrylic acid, methacrylic acid, itaconic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, dimethylaminoethyl acrylate, acrylonitrile, methacrylic acid. Ronitrile, N-vinyl-2
-Polymerizable unsaturated monomers having a polar group such as a carboxyl group, a hydroxyl group or an amino group in the molecule, such as pyrrolidone.

The compounding amount is 1 to 3 with respect to 99 to 70 parts by weight of the alkyl (meth) acrylate.
It is preferably 0 parts by weight. 1 polar group-containing monomer
When the amount is less than 30 parts by weight, the adhesive strength of the pressure-sensitive adhesive tape is reduced, and when the amount is more than 30 parts by weight, the adhesive properties particularly at a low temperature of the adhesive tape are deteriorated. The polar group-containing monomers described above are used alone or in combination of two or more.

As the above-mentioned photopolymerization initiator, a usual photopolymerization initiator used for radical photopolymerization such as a vinyl group or a (meth) acryloyloxy group is used. For example,
2,2-dimethoxy-1,2-diphenylethane-1-
Benzyldimethyl ketal compounds such as ON (Irgacure 651 from Ciba-Geigy), 1-hydroxycyclohexyl phenyl ketone (Irgacure 184 from Ciba-Geigy), 2-hydroxy-2-methyl-1-phenylpropan-1-one (from Ciba-Geigy) Α-hydroxyketone compounds such as Darocure 1173);
Α-aminoketone compounds such as benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1 (Irgacure 369 of Ciba-Geigy), bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide ( Irgacure 81 from Ciba-Geigy
9) etc., bis (2,6-dimethoxybenzoyl) -2,4,
Bisacylphosphine oxides such as 4-trimethylpentylphosphine oxide and Darocure 117
1: 3 mixture with 3 (Irgacure 1 from Ciba-Geigy)
700), bis (2,6-dimethoxybenzoyl)-
1: 1 mixture of bisacylphosphine oxide such as 2,4,4-trimethylpentylphosphine oxide and Irgacure 184 (Irgacure 1850 manufactured by Ciba Geigy), benzoin ethyl ether compounds such as benzoin ethyl ether and benzoin isopropyl ether Is mentioned. In particular, a photopolymerization initiator such as a bisacylphosphine oxide-based compound that generates two or more active species (radicals) from one molecule by light irradiation is desirable.

These photopolymerization initiators are preferably used in a ratio of 0.001 to 5 parts by weight based on 100 parts by weight of the photocurable pressure-sensitive adhesive. If the amount is less than 0.001 part by weight, it is difficult to complete the polymerization sufficiently. If the amount is more than 5 parts by weight, the molecular weight of the obtained pressure-sensitive adhesive polymer becomes small, The adhesive properties of the tape are reduced, and both are not preferable in terms of the adhesive properties.

Further, if necessary, the photocurable pressure-sensitive adhesive of the present invention may be added in an amount of 0.00
About 1 to 5 parts by weight of a photopolymerizable compound such as a polyfunctional acrylic (methacrylic) monomer may be added. Such photopolymerizable compounds include hexanediol di (meth) acrylate, neopentyl glycol di (meth)
Acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerothritol hexa (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, epoxy acrylate, polyester Acrylate, urethane acrylate and the like can be mentioned.

The photocurable pressure-sensitive adhesive for producing the pressure-sensitive double-sided adhesive tape of the present invention is usually a tackifier such as a rosin-based resin, a terpene-based resin, a petroleum resin, etc. used for acrylic resin and the like. May be added.

The photocurable pressure-sensitive adhesive of the present invention may further contain commonly used additives such as a thickener, a thixotropic agent and a filler. Examples of the thickener include acrylic rubber and epichlorohydrin rubber, and examples of the thixotropic agent include ultrafine silica (Aerosil 300).
Etc.). Examples of the filler include inorganic particles such as calcium carbonate, titanium dioxide, and silicon dioxide; organic particles such as nylon beads, acrylic beads, and silicone beads; inorganic hollow particles such as glass balloons and alumina balloons; acrylic balloons; and vinylidene chloride balloons. Organic hollow particles, polyester, nylon, rayon,
Organic or inorganic short fibers such as glass are exemplified. These are added in order to improve the mechanical properties (such as stress relaxation properties) of the pressure-sensitive adhesive tape, and are used in a range that does not impair photocurability and the like.

Next, a method for producing the pressure-sensitive adhesive tape of the present invention will be described.

First, the above-mentioned photocurable pressure-sensitive adhesive is applied on a sheet substrate such as a polyester film or a stretched polypropylene film which has been subjected to a release treatment, to obtain a first pressure-sensitive adhesive layer. A photocurable pressure-sensitive adhesive serving as a base material layer of the tape is applied thereon to obtain a second base material layer. As the photo-curable pressure-sensitive adhesive serving as the base material layer, glass photo-curable pressure-sensitive adhesive serving as the first pressure-sensitive adhesive layer, inorganic hollow particles such as glass balloons and alumina balloons, and organic such as acrylic balloons and vinylidene chloride balloons. A composition which is thickened by adding hollow particles, ultrafine silica or the like is desirable. A third pressure-sensitive adhesive layer is formed on the base material layer. In this case, the photocurable pressure-sensitive adhesive used for the first pressure-sensitive adhesive layer is usually used. Next, ultraviolet rays are irradiated from a light source, and the above-mentioned three layers are simultaneously photo-cured to obtain an adhesive tape. In this case, it is preferable to irradiate light from above and below the tape from the viewpoint of uniformly causing the curing reaction.

The coating method is not particularly limited, and a usual coating method such as a roll coater or a die coater is used. In the case of thin coating, a gravure coater or the like can be used. Usually, depending on the film thickness to be applied,
Coating is performed by adjusting the viscosity of the photocurable pressure-sensitive adhesive.

When these photocurable pressure-sensitive adhesives are cured, the curing reaction is inhibited by oxygen in the air or oxygen dissolved in the pressure-sensitive adhesive. Light irradiation or light irradiation is performed through a protective film. A tin salt compound having a deoxidizing effect, such as stannous octoate or triisodecyl phosphite, or a phosphorus-based compound may be added to suppress the inhibition of curing by oxygen.

As a light source used for photo-curing of the adhesive tape, a lamp which emits light having a wavelength of 250 to 450 nm is desirable, and examples thereof include a chemical lamp, a black light, and a low-pressure mercury lamp. The light intensity used is usually 365 nm to obtain a high molecular weight acrylic polymer.
Is preferably used at a relatively low ultraviolet intensity of about 0.1 to 10 mW / cm ² .

Hereinafter, the method for producing the pressure-sensitive double-sided adhesive tape of the present invention will be specifically described. However, the pressure-sensitive double-sided adhesive tape of the present invention is not limited to one manufactured by this method. First, in order to obtain a pressure-sensitive adhesive composition serving as the first and third pressure-sensitive adhesive layers of a pressure-sensitive adhesive tape having a three-layer structure of a pressure-sensitive adhesive layer, a base material layer, and a pressure-sensitive adhesive layer, an alkyl (meth) acrylate A predetermined amount of the ester monomer and the polar group-containing monomer are mixed, and a predetermined amount of an acrylic high molecular weight material having a photoactive functional group and a photopolymerization initiator are added thereto, followed by sufficient stirring and mixing. To obtain a uniform adhesive solution. At this time, the viscosity of the adhesive solution at 25 ° C. is 1,000 to 10,000 c.
It is preferably p for coating. The viscosity is adjusted according to the film thickness to be applied. Further, if necessary, the above-mentioned polyfunctional (meth) acrylic monomer, thixotropic agent, etc. may be added to the above-mentioned pressure-sensitive adhesive solution.

Further, in order to obtain a base material layer composition to be a second base material layer of the pressure-sensitive adhesive tape having a three-layer structure, (meth)
Acrylic acid alkyl ester monomer, polar group-containing monomer, acrylic high molecular weight having a photoactive functional group, a photopolymerization initiator and inorganic hollow particles such as glass balloons are mixed in a predetermined blending amount and sufficiently mixed. To obtain a uniform base layer composition. The substrate layer needs to be coated thicker than the pressure-sensitive adhesive layer in order to impart stress relaxation to the tape, and the viscosity of the substrate layer composition at 25 ° C. is 2,
It is preferably from 000 to 30,000 cp for coating. The viscosity is adjusted according to the film thickness to be applied. If necessary, the aforementioned polyfunctional (meth) acrylic monomer, thixotropic agent, etc. may be added to the base layer composition.

A method for producing a pressure-sensitive double-sided adhesive tape having a three-layer structure using the pressure-sensitive adhesive composition and the substrate layer composition thus produced will be described below.

First, the above-mentioned pressure-sensitive adhesive composition is applied on a sheet substrate such as a polyester film which has been subjected to a release treatment by a comma coater method, and usually a predetermined thickness of about 10 to 100 μm is obtained. The base material layer composition is applied thereon by a die coater to obtain a predetermined thickness of usually about 50 to 2,000 μm. On top of that, the above-mentioned pressure-sensitive adhesive composition is applied by a comma coater method, and usually a predetermined film thickness of about 10 to 100 μm is obtained. Using a black light under a nitrogen atmosphere on the adhesive layer having a three-layer structure formed in this manner,
An ultraviolet ray having an intensity of about 1 mW / cm ² at 365 nm is irradiated for 20 seconds to 5 minutes to simultaneously cure the three layers, separate the sheet substrate, and obtain a pressure-sensitive double-sided adhesive tape. The pressure-sensitive double-sided adhesive tape of the present invention is thus obtained, and when the present tape is adhered to an adherend, it exhibits excellent adhesiveness and heat resistance.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive double-sided adhesive tape of the present invention and a method for producing the same will be specifically described with reference to Examples of the embodiments. However, the pressure-sensitive double-sided adhesive tape of the present invention and the method for producing the same are not limited thereto. In the description of the examples and comparative examples of the embodiment, “parts” indicates parts by weight.

Example 1 2-ethylhexyl acrylate having a weight average molecular weight of 700,000 and a photoactive functional group content of 0.01 meq / g in 63 parts of 2-ethylhexyl acrylate and 7 parts of acrylic acid Was added and 0.5 part of Irgacure 1850 (Ciba Geigy) was added and mixed well to obtain a uniform adhesive composition having a viscosity of 3,000 cp at 25 ° C. .

Similarly, 65 parts of 2-ethylhexyl acrylate and 5 parts of acrylic acid have a weight average molecular weight of 70 parts.
30 parts of an acrylic polymer having 2-ethylhexyl acrylate having a photoactive functional group content of 0.01 meq / g as a main component, 30 parts of Irgacure 1850 (Ciba Geigy), and an average particle size of 10,000 Is about 50 μm and the specific gravity is 0.
50 hollow glass beads (50 parts) were added and mixed well to obtain a uniform base layer composition.

Next, the above-mentioned pressure-sensitive adhesive composition was applied to a thickness of 50 μm on a 50 μm-thick polyester film having been subjected to a release treatment, and the above-mentioned base material layer composition was applied thereon to a thickness of 500 μm. The pressure-sensitive adhesive composition was applied to a thickness of 50 μm. To this, using a black light under a nitrogen atmosphere,
Ultraviolet light having an ultraviolet intensity of 1 mW / cm ² at 365 nm was irradiated from above and below for 2 minutes to obtain a pressure-sensitive double-sided adhesive tape having a three-layer structure. The adhesive strength of this adhesive tape to the stainless steel plate was 6 kgf / 25 mm, and the shear adhesive strength was 8 kgf / cm ² . In addition, a shear holding force test (load: 1 kg) at 180 ° C. for 1 hour was performed, and no slippage or drop was observed.
And heat resistance.

Example 2 Isooctyl acrylate 65
Part, 5 parts of acrylic acid, 30 parts of an acrylic high-molecular material mainly composed of 2-ethylhexyl acrylate having a weight average molecular weight of 700,000 and a photoactive functional group content of 0.01 meq / g, and Irgacure. 1850 (Ciba Geigy)
0.5 part was added and mixed well to obtain a uniform pressure-sensitive adhesive composition having a viscosity of 2,500 cp at 25 ° C.

Similarly, 2-ethylhexyl acrylate having a weight average molecular weight of 700,000 and a photoactive functional group content of 0.01 meq / g was added to 65 parts of 2-isooctyl acrylate and 5 parts of acrylic acid. 30 parts of an acrylic high molecular weight material containing 0.5% Irgacure 1850 (Ciba Geigy), an average particle size of about 50 μm, and a specific gravity of 0.1
100 parts of the hollow glass beads of No. 5 were added and mixed well to obtain a uniform base layer composition.

Next, the above-mentioned pressure-sensitive adhesive composition is applied to a thickness of 60 μm on a 50 μm-thick polyester film subjected to a release treatment, and the above-mentioned base material layer composition is applied thereon to a thickness of 800 μm. The pressure-sensitive adhesive composition was applied to a thickness of 60 μm. To this, using a black light under a nitrogen atmosphere,
Ultraviolet light having an ultraviolet intensity of 1 mW / cm ² at 365 nm was irradiated from above and below for 3 minutes to obtain a pressure-sensitive double-sided adhesive tape having a three-layer structure. The adhesive strength of this adhesive tape to the stainless steel plate was 8 kgf / 25 mm, and the shear adhesive strength was 10 kgf / cm ² . In addition, a shear holding force test (load: 1 kg) at 180 ° C. for 1 hour was performed, and no slippage or drop was observed.
And heat resistance.

Examples 3 to 10 In the same manner as in Examples 1 and 2, pressure-sensitive double-sided adhesive tapes having a three-layer structure were prepared under the compositions and preparation conditions shown in Tables 1 and 2.
In Tables 1 and 2, all photopolymerization initiators used were Irgacure 1650 and 0.5 parts. Table 3 shows the measurement results of the adhesive force, shear adhesive force, and shear holding force of this pressure-sensitive double-sided adhesive tape, and all showed excellent adhesive / adhesive properties and heat resistance. In addition, coating properties and film forming properties when producing the pressure-sensitive adhesive tape / sheet were also good.

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

Comparative Example 1 2-ethylhexyl acrylate and 63 parts of acrylic acid each had a weight-average molecular weight of 700,000 and an acrylic resin mainly composed of 2-ethylhexyl acrylate containing no photoactive functional group. 30 parts of a molecular weight substance and 0.5 part of Irgacure 1850 (Ciba Geigy) were added, mixed well, and the viscosity at 25 ° C. was 3,000.
A pressure-sensitive adhesive composition having a uniform cp was obtained.

Similarly, 65 parts of 2-ethylhexyl acrylate and 5 parts of acrylic acid have a weight average molecular weight of 70 parts.
In all, 30 parts of an acrylic high-molecular-weight body mainly composed of 2-ethylhexyl acrylate containing no photoactive functional group,
0.5 parts of Irgacure 1850 (Ciba Geigy) and 50 parts of hollow glass beads having an average particle size of about 50 μm and a specific gravity of 0.15 were added and mixed well to obtain a uniform base layer composition.

Next, the above-mentioned pressure-sensitive adhesive composition was applied to a thickness of 50 μm on a 50 μm-thick polyester film having been subjected to a release treatment, and the above-mentioned base layer composition was applied thereon to a thickness of 500 μm. The pressure-sensitive adhesive composition was applied to a thickness of 50 μm. To this, using a black light under a nitrogen atmosphere,
Ultraviolet light having an ultraviolet intensity of 1 mW / cm ² at 365 nm was irradiated from above and below for 2 minutes to obtain a pressure-sensitive double-sided adhesive tape having a three-layer structure. The adhesive strength of this adhesive tape to the stainless steel plate was 6 kgf / 25 mm, and the shear adhesive strength was 6 kgf / cm ² . 80 ° C or 180 ° C
, A shear holding force test (load: 1 kg) was performed, and it was found that each of them fell within 10 minutes and was inferior in holding force and heat resistance.

[0049]

According to the present invention, it is possible to produce a pressure-sensitive double-sided adhesive tape / sheet with good mass productivity in order to achieve both high tackiness and high heat resistance and to have excellent coating properties and photocurability. Can be.

Continued on the front page (72) Inventor Kazuo Naume 3819 Noto, Noto, Tama-ku, Kawasaki-shi, Kanagawa F-Term in Sliontec Co., Ltd. (Reference) 4J004 AA10 AB01 AB07 CA03 CB03 CC02 CD09 DA02 DA03 EA05 FA08 4J027 AA02 AB03 AC03 AC04 AC06 AE01 AG01 AJ01 AJ04 AJ08 BA02 BA06 BA08 BA10 BA13 BA15 BA19 BA23 BA26 CA03 CA04 CA06 CA07 CA10 CA14 CA18 CA19 CA36 CA38 CB10 CC05 CD09 4J040 DF011 DF012 DF041 DF042 DF051 DF052 DF061 DF062 FA061 FA06 FA02 FA091 FA091 FA091 FA091 FA091 FA091 FA091 FA091 HD23 JA09 JB08 JB09 KA03 KA05 KA13 LA01 LA05 LA06 LA08 LA11

Claims (3)

[Claims] 1. An acrylic system having an alkyl (meth) acrylate monomer, a polar group-containing monomer, and a photoactive functional group in all three structures of an adhesive layer, a base material layer and an adhesive layer. In a pressure-sensitive double-sided adhesive tape prepared using a photocurable pressure-sensitive adhesive containing a high molecular weight material and a photopolymerization initiator as main components, the acrylic high molecular weight material having the photoactive functional group is 200,000 to 3,000,000. Has a weight average molecular weight, and
The pressure-sensitive double-sided adhesive tape, wherein the content of the photoactive functional group is 0.001 to 0.5 meq / g. 2. The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, wherein the alkyl (meth) acrylate monomer, the polar group-containing monomer, the acrylic polymer having a photoactive functional group, and the light-sensitive material. It is a photocurable pressure-sensitive adhesive containing a polymerization initiator as a main component, and the pressure-sensitive adhesive forming the base layer is a photocurable pressure-sensitive adhesive obtained by adding inorganic hollow particles to the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer. 2. The pressure-sensitive double-sided adhesive tape according to claim 1, wherein: 3. An adhesive layer, a substrate layer, and an adhesive layer are sequentially coated on the sheet substrate using the photocurable adhesive according to claim 2, and the light-irradiated adhesive is applied to the sheet substrate by light irradiation. A method for producing a pressure-sensitive double-sided adhesive tape, comprising the three-layer structure prepared by simultaneously curing an adhesive layer, the base layer, and the adhesive layer.