JPH0366780A - Photo-setting tacky agent composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention has adhesive properties during bonding, can temporarily adhere to adherends, and hardens upon light irradiation to provide strong adhesive force. The present invention relates to a photocurable pressure-sensitive adhesive composition suitable as a so-called pressure-sensitive adhesive.

(Prior art) Photocurable adhesives have traditionally been suitable as so-called adhesives, which have tackiness during bonding, can temporarily adhere to adherends, and exhibit strong adhesive strength when cured by light irradiation. As a composition, one in which a monoreactive oligomer or monomer is blended with an adhesive polymer is known (Japanese Patent Publication No. 53-3189).
8, JP-A-60-69178, JP-A-61
-64773 Publication 2 JP-A-61-83274,
JP-A-61-101582, JP-A-61-101
Publication No. 583.

(See Japanese Patent Application Laid-Open No. 61-103908, etc.). However, in these compositions, cohesive strength is reduced due to the addition of monoreactive oligomers or monomers.

In some cases, sufficient adhesive strength cannot be obtained after curing, or it is necessary to mechanically temporarily fix the adhesive in order to obtain sufficient adhesive strength after curing. It is also known to use adhesive polymers that have been given reactivity by introducing unsaturated groups or functional groups (see JP-A-61-83272, etc.), but di-reactive oligomers and monomers was necessary, and a decrease in cohesive force was unavoidable.

On the other hand, reducing the amount of reactive oligomers and monomers added to improve adhesive properties, especially cohesion, before curing;
Curability becomes low and adhesive strength after curing decreases. As described above, a photocurable pressure-sensitive adhesive composition having sufficiently excellent adhesive properties before curing, particularly both cohesive force and adhesive force after curing, has not been developed.

(Problem B to be Solved by the Invention) The present invention solves the above-mentioned problems in conventional photocurable adhesive compositions, namely, the imbalance between the adhesive properties before curing, especially the cohesive force and the adhesive force after curing. The object of the present invention is to provide a photocurable pressure-sensitive adhesive composition that improves the disadvantages of poor performance and has sufficiently excellent adhesive properties before curing and adhesive strength after curing because the polymer body is photocurable.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a rubbery polymer (a) having 5 tertiary agono groups.
, optionally a cyclic acid anhydride (b), and a resin having an ethylenically unsaturated group in the side chain obtained by reacting a monomer (c) containing an ethylenically unsaturated group and an epoxy group or an aziridinyl group ( A) and, if necessary, a photopolymerization initiator (B).

In the present invention, the rubbery polymer (a) having a tertiary amino group includes an acrylic resin having a tertiary amino group, a homopolymer of a monomer having a tertiary amino group, and a copolymer of these monomers. , these monomers and alkyl (meth)acrylates, vinyl acetate, vinyl propionate, vinyl ethers.

These include copolymers with other monomers such as styrene and (meth)acrylonitrile. Monomers having a tertiary amino group include dimethylaminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate,
Examples include dimethylaminopropyl (meth)acrylamide, vinylpyrrolidone, vinylcaprolactam, vinylcarbazole crystal, vinylimidazole, and divinylethylene monomer. Alkyl (meta)
Examples of acrylates include alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and octyl (meth)acrylate. In addition to the above monomers, hydroxyl groups, -class amino groups, secondary amino groups, and Monomers having functional groups such as groups can also be used. These monomers include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (
Hydroxyalkyl (meth) such as meth)acrylates
Acrylate, (N-alkyl)aminoethyl (
There are meta)acrylates, etc.

In the present invention, cyclic acid anhydride (bl is an intramolecular anhydride of polycarboxylic acid, saturated or unsaturated aliphatic polycarboxylic acid anhydride, alicyclic polycarboxylic acid anhydride,
Aromatic polycarboxylic acid anhydrides, etc., or partially saturated or unsaturated hydrocarbon groups.

Some are substituted with aromatic ring groups, halogen atoms, heterocyclic groups, etc. Specific examples of these include succinic anhydride, phthalic anhydride, maleic anhydride, itaconic anhydride, glutaric anhydride, and dodecenyl succinic anhydride. acid.

Chlorenedesocic anhydride, biromellisotonic anhydride, trimellisotonic anhydride, cyclobenkunetetracarboxylic dianhydride, hexahydrophthalic anhydride, methylhexahydronotaric anhydride, tetramethylene maleic anhydride, tetrahydrofucric anhydride, methyltetracarboxylic anhydride Phthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, 5- (2,5-
dioxotetrahydroxyfuryl)-3-methyl-3-
Cyclohexene 1,2-dicarboxylic anhydride, methylnadisocic anhydride, benzophenonetetracarboxylic anhydride,
Ethylene glycol bis(anhydrotrimellitate)
.

Among these, dicarboxylic acid or tricarboxylic acid anhydrides that do not form a crosslinked structure are preferably used, such as glycerol tris (anhydrotrimellitate).

In the present invention, monomers having an ethylenically unsaturated group and an epoxy group or an aziridinyl group include:
Glycidyl (meth)acrylate, glycidyl cinnamate, glycidyl ether, vinylcyclohexene monoepoxide, 1,3-butadiene monoepoxide, etc. having epoxy groups, 2-(1-aziridinyl)ethyl (meth)acrylate, There are some that have an aziridinyl group such as 2-(1-aziridinyl)butyl (meth)acrylate and 2-(1-aziridinyl)propyl (meth)acrylate, and these are saturated or unsaturated hydrocarbon groups, aromatic ring groups, It may be substituted with a halogen atom, a heterocyclic group, etc.

The rubbery polymer (a), cyclic acid anhydride (bl and monomer (c)) are reacted to obtain a resin (A) having an ethylenically unsaturated group in the side chain.The reaction is carried out in the presence of an appropriate solvent. Alternatively, it is carried out in the absence of N N-, in which case the tertiary acarino group itself acts as a catalyst for the reaction, so the reaction proceeds without a catalyst.
Dimethylbenzylamine, triethylamine 1 Tributylamine, N,N-diethylaniline, N,N-
Tertiary amines such as dimethylaniline can also be used as a catalyst. Furthermore, in order to keep the introduced ethylenically unsaturated group stable during this reaction, the reaction can be carried out with the addition of a radical polymerization inhibitor such as hydroquinone, hydroquinone monomethyl ether, tert-butylcatechol, or p-benzoquinone. .

In the reaction, first, the tertiary amino group of the rubbery polymer (a) reacts with the epoxy group or aziridinyl group of the monomer (c), and then the secondary hydroxyl group or amino group produced by this reaction is reacted with a cyclic acid. The anhydride (b) reacts with the acid anhydride group to produce a carboxyl group. Furthermore, this carboxyl group and the epoxy group or aziridinyl group of the monomer (c) react to produce a hydroxyl group or an amino group, and the same reaction as above can proceed in sequence.
By adjusting the amount of cyclic acid anhydride (b) and monomer (c) reacted with respect to the amount of rubbery polymer (a), the desired number of ethylenically unsaturated Slightly longer side chains of the desired length can be introduced into the group.

When the cyclic acid anhydride (b) is a dicarboxylic acid anhydride, 0 to 9 mol of the cyclic acid anhydride (b) and the monomer (c
) in a proportion of 1 to 10 mol, and also cyclic acid anhydride (b
It is preferable to react the monomer (c) at a ratio of approximately 1 mole more than that of the monomer (c). When the cyclic acid anhydride (b) is a tricarboxylic acid, 0 to 9 mol of the cyclic acid anhydride (b) and 1 to 1 mol of the monomer (c) are used per 1 mol of the tertiary amino group of the rubbery polymer (a). In a proportion of 19 moles, also
Monomer (c) per n mole of cyclic acid anhydride (b)
It is preferable to react the monomer (c) in a ratio of approximately n+1 to 2n1,000 moles, when the amount of monomer (c) to be reacted with respect to 1 mole of tertiary amino group of the rubbery polymer (a) is less than 1 mole. , the number of ethylenically unsaturated groups in the resulting resin (A) may decrease, making it impossible to impart sufficient reactivity to the resin (A). Conversely, if the amount of the cyclic acid anhydride (b) is less than 9 mol, If it exceeds the unreacted cyclic acid anhydride (b
), residual monomer (c), and rubbery polymer (a
) are not combined.

There is a tendency for more reaction products between the cyclic acid anhydride (b) and the monomer (c) to be produced. The resulting resin (A) is:

Since the resin (A) itself has sufficient curability because it has one or more slightly long side chains that usually have a plurality of ethylenically unsaturated groups, Even without the use of adhesive, it exhibits sufficient adhesive strength after curing. Moreover, since the side chain has an ethylenically unsaturated group, the adhesive properties of the rubbery polymer (a), especially the cohesive force, are maintained, and the resulting resin (A) has excellent adhesive properties before curing. . As a result, the resin (A) obtained has a sufficiently excellent balance between adhesive properties before curing and adhesive strength after curing.

In the present invention, as the photopolymerization initiator (B) used as necessary, benzoin, benzoin methyl ether, benzoin ethyl ether, methyl 0-benzoylbenzoate-p-benzoin ethyl ether, benzoin isopropyl ether, α-methyl Benzoins such as benzoin, acetophenones such as dimethylbenzyl ketal, trichloroacetophenone, 2,2-jethoxyacetophenone, and 2-hydroxy-2-methylpropiophenone.

Propiophenones such as 2-hydroxy-4'-isopropyl-2-methylpropiophenone, benzophenones such as α-aziroxime ester, benzophenone, methylbenzophenone, p-chlorobenzophenone, p-dimethylagonobenzophenone, 2 -thioxanthone such as chlorothioxanthone, 2-ethylthioxanthone, 2-isopropylthioxanthone, benzyl,
In addition to dibenzosuberone, Kiyoshi Kato m: rUV・E
B Curing Handbook - Raw Materials 1-J (December 1985
May, Polymer Publication Rate) pp. 67-73 or "Crosslinking Agent Handbook" edited by Fuzo Yamashita and Tosuke Kaneko (January 1982)
There is one described in pages 582-593 of October, published by Taiseisha. The photopolymerization initiator (B) may be used together with a photopolymerization accelerator. As such a photopolymerization accelerator, 4
．． 4'-bis(diethylami))benzophenone.

In addition to ethyl N-dimethylaminobenzoate, dimethylethanolamine, glycine, etc., those described in Kiyoshi Kato, cited above, pp. 67-73, can be used.

When using ultraviolet light as light, 1. From the viewpoint of curing efficiency,
It is preferable to use a photopolymerization initiator (B) and, if necessary, a photopolymerization accelerator. The photopolymerization initiator (B) is usually 0.05 to 2 parts per 100 parts by weight of the total amount of the compound having an ethylenically unsaturated double bond in the pressure-sensitive adhesive composition of the present invention.
It is used in a proportion of 0 parts, preferably 0.5 to 10 parts.

Improves adhesive properties before curing. In particular, in order to increase the cohesive force, a polyisocyanate can be further added to the adhesive composition of the present invention to partially crosslink the resin (A).

This method uses hydroxyl groups in the main chain rubbery polymer (a), -
It is particularly effective when it has a primary amino group or a secondary amino group. As such polyisocyanate, (hydrogenated) tolylene diisocyanate, (hydrogenated) 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, etc. can be used.

To further strengthen the adhesive strength after curing.

In the pressure-sensitive adhesive composition of the present invention, in addition to the resin (A) having an ethylenically unsaturated group in the side chain, the photopolymerization initiator (B), and the photopolymerization accelerator, the pressure-sensitive adhesive composition further contains an ethylene compound such as a (meth)acryloyl group. Monomers and oligomers having sexually unsaturated groups can be added. Such monomers and oligomers include styrene.

Alkyl (meth)acrylate, (meth)acrylic acid, polyhydric alcohol poly (meth)acrylate, epoxy poly (meth)acrylate, oligoester poly
In addition to (meth)acrylate, polyurethane poly(meth)acrylate, diallyl phthalate, diallyl isophthalate, hydroxyl group, -class amino group.

Unsaturated oligoester or unsaturated oligoamide obtained by reacting a low molecular compound having a secondary amino group or a tertiary amino group, a cyclic acid anhydride, and a monomer having an ethylenically unsaturated group and an epoxy group or an aziridinyl group. can be used. The amount of these monomers and oligomers used is 60% by weight or less based on the total solid content of the adhesive composition of the present invention. If it exceeds 60% by weight, the adhesive properties before curing, especially the cohesive force, will be significantly inferior.

The pressure-sensitive adhesive of the present invention may optionally contain pigments, dyes, and inorganic fillers within a range that does not impede its performance.

Organic solvent,! J! Metal powders such as powder, copper powder, and Nisokel powder.

Carbon black, a tackifier such as graphite xylene resin or rosin resin, a silane coupling agent, etc. can be added.

The pressure-sensitive adhesive composition of the present invention can be applied to paper or cloth treated with silicone, paper or cloth treated with a low-adhesion resin such as polyethylene terephthalate film laminate, etc. 1 Metal foil, plastic film, etc. with high peelability. Film 2 It is coated on a sheet or tape, and if necessary, the organic solvent is removed by drying, and if necessary, it is cut into a one-sided or one-sided adhesive sheet or tape. In addition, for reinforcement and impact mitigation, it may be lined with a non-woven fabric such as rayon or nylon or a fabric such as cheesecloth, or these fabrics may be used as a core material by impregnating them with the adhesive composition of the present invention. You can also do it.

The thus obtained double-sided adhesive sheet or tape is sandwiched between two adherends of the same type or different types, at least one of which is light-transmissive, and after temporary adhesion due to its good adhesive properties, it is irradiated with light. By doing so, the adhesive composition is cured, and the adherends can be firmly adhered to each other. In addition, the 4-single-sided adhesive sheet or tape temporarily adheres to the adherend due to its good adhesive properties, and then, if necessary, the base sheet or tape is peeled off and the resulting adhesive surface is used to attach other adherends. The adhesive composition is further temporarily adhered and irradiated with light to cure the adhesive composition, thereby making it possible to firmly adhere the adhesive composition to the adherend.

In the present invention, light includes visible light from the sun or fluorescent lamps, ultraviolet rays from high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, carbon arc lamps, xenon lamps, etc., and electron beam accelerators as radiation sources. γ-rays using cobalt-60 as a radiation source, or xl radiation using an X-ray generator as a radiation source. Among these, visible light, ultraviolet rays, or electron beams, especially those with a wavelength of 200 nm, are practically used.
It is preferable to use visible light or ultraviolet light of ~800 nm. When ultraviolet rays are used as the light, it is preferable to use a photopolymerization initiator (B) and, if necessary, a photopolymerization accelerator, as described above, from the viewpoint of curing efficiency. Source output.

Although it varies depending on the distance from the radiation source, the irradiation area, the type and amount of the resin, photopolymerization initiator and photopolymerization accelerator used, the thickness of the adhesive composition layer, etc., the time of light irradiation is usually 0.3 seconds or more. That's about it.

(Example) The present invention will be explained below with reference to Examples. In the examples, 1 part means part by weight, and 1% means % by weight.

Example 1 Butyl acrylate 86.4 parts Vinyl acetate 6.8 parts Dimethyl acetate 5 Nobrovir methacrylamide 6.8 parts Azobisisobutyronitrile 0.2 parts Ethyl acetate 233 parts 80
167 parts of a mixture of the above composition heated to .

After dropping 167 parts of the mixture having the above composition and completing one drop.

Heat under reflux for 12 hours, cool, and add hydroquinone to 0°0
5 parts were added to obtain a solution (solid content: 30%) of a rubbery polymer having tertiary amino groups.

Solution 2 of the obtained rubbery polymer having tertiary amino groups
60 parts of hexahydrophthalic anhydride, 13 parts of glycidyl methacrylate, and 0.3 parts of hydroquinone were mixed and reacted at 80°C for 12 hours.
1 part was added to obtain a solution (solid content: 30%) of a resin having an ethylenically unsaturated group in a slightly long side chain.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in its slightly long side chain and 0.3 part of 2-hydroxy-2-methylpropiofenone were uniformly mixed.

It was coated onto a silicone-treated polyethylene terephthalate film to a dry thickness of 30 μm, and dried at 60° C. for 3 minutes to obtain a pressure-sensitive adhesive sheet.

The results of measuring the peel adhesion and holding power before photo-curing and the shear adhesive force after photo-curing of the obtained pressure-sensitive adhesive sheets are shown in the table. Note that the measurements were performed as follows.

■Peel adhesion strength before photocuring A polyethylene terephthalate sheet with a thickness of 50 μm is pasted on the adhesive surface of the obtained adhesive sheet, cut into 2 pieces of 25 mm in width, firstly the polyethylene terephthalate film is peeled off, and the resulting adhesive surface is covered with paper. It was attached to a stainless steel plate (SUS 304) polished with a #280 file, left for 30 minutes, and then 180 degree peel adhesive strength was measured at 25°C and 65% relative humidity at a peeling speed of 300 mm for 7 minutes. .

■ Holding power before photocuring A polyethylene terephthalate sheet with a thickness of 50 μm is pasted on the adhesive surface of the obtained adhesive sheet, cut into 2 pieces of 25 mm in width and 100 mm in length, and the polyethylene terephthalate film is first peeled off. A part of the resulting adhesive surface measuring 25 mm vertically and 25 mm horizontally was attached to a stainless steel plate (SUS304) polished with #280 sandpaper, and the adhesive sheet was heated at 40°C under a load of 1 kg until the adhesive sheet fell from the stainless steel plate. The time (seconds) was measured.

■Shear adhesive strength after photocuring Cut the obtained adhesive sheet into 10 mm long and 19 mm wide pieces, and place the adhesive side on one end of each of two acrylic plates measuring 50 mm long, 10 mm wide, and 1.5 mm thick. Attach it, peel off the polyethylene terephthalate film, and attach it so that the adhesive surfaces overlap.

After curing the adhesive by irradiating it with ultraviolet rays for 15 seconds at a distance of 15 cm under a 2 kW high-pressure mercury lamp, it was heated to 25°C and a relative humidity of 65°C.
%, the shear strength was measured at a tensile rate of 5 mm/min.

Example 2 Butyl acrylate) 80.0
Part vinyl acetate 6.7 parts Dimethylanopropylmethacrylamide 13.3 parts Azobisisobutyronitrile 0.2 parts Ethyl acetate 233 parts The mixture of the above components was reacted in the same manner as in Example 1, and tertiary A solution (solid content: 30%) of a rubbery polymer having amino groups was obtained.

Solution 2 of the obtained rubbery polymer having tertiary amino groups
13 parts, hexahydrophthalic anhydride 15 parts.

After mixing 21 parts of glycidyl methacrylate and 0.3 parts of hydroquinone and reacting in the same manner as in Example 1, 84 parts of ethyl acetate was added and a solution of a resin having an ethylenically unsaturated group in a slightly long side chain ( Solid content: 30%) was obtained.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in a slightly long side chain and 0.3 part of 2-hydroxy-2=methylpropiophenone were uniformly mixed and adhesive was prepared in the same manner as in Example 1. A sheet was obtained and the results of measurements are shown in the table.

Example 3 Butyl acrylate 88.0 parts Dimethyl anoethyl methacrylate 12.0 parts Azobisisobutyronitrile 0.2 parts Ethyl acetate 233 parts The above mixture was reacted in the same manner as in Example 1, A solution of a rubbery polymer having a tertiary amino group (solid content 30%) was obtained 6 A solution of a rubbery polymer having a tertiary amino group obtained 2
13 parts, hexahydrophthalic anhydride 15 parts.

After mixing 21 parts of glycidyl methacrylate and 0.3 parts of hydroquinone and reacting in the same manner as in Example 1, 84 parts of ethyl acetate was added to prepare a solution of a resin having an ethylenically unsaturated group in a slightly long side chain ( Solid content: 30%) was obtained.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in its slightly long side chain and 0.3 part of 2-hydroxy-2-methylpropiophenone were uniformly mixed.

An adhesive sheet was obtained in the same manner as in Example 1, and the measurement results are shown in the table.

Example 4 Butyl acrylate 94.0 parts Dimethylaminoethyl methacrylate 6.0 parts Azobisisobutyronitrile 0.2 parts Ethyl acetate 233 parts A mixture having the above composition was reacted in the same manner as in Example 1 to obtain a tertiary acetate. A solution (solid content 30%) of a rubbery polymer having a group was obtained.

Solution 2 of the obtained rubbery polymer having tertiary amino groups
60 parts of hexahydrophthalic anhydride, 13 parts of glycidyl methacrylate, and 0.3 parts of hydroquinone were mixed and reacted in the same manner as in Example 1. Then, 51 parts of ethyl acetate was added, and ethylene was added to the slightly longer side chain. A solution (solid content: 30%) of a resin having a sexually unsaturated group was obtained.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in its slightly long side chain and 0.3 parts of 2-hydroxy-2-methylpropiophenone were uniformly mixed and a pressure-sensitive adhesive sheet was prepared in the same manner as in the example. The obtained and measured results are shown in the table.

Example 5 Butyl acrylate 79.1 parts Vinyl acetate 6.6 parts Diethyla ξnoethyl methacrylate 14.3 parts Abbisisobutyronitrile 0.2 parts Ethyl acetate 233 parts The above mixture was prepared in the same manner as in Example 1. A solution (solid content: 30%) of a rubbery polymer having a tertiary a≧no group was obtained.

Solution 2 of the obtained rubbery polymer having tertiary amino groups
13 parts, 15 parts of hexahydrophthalanhydride M.

After mixing 21 parts of glycidyl methacrylate and 0.3 parts of hydroquinone and reacting in the same manner as in Example 1, 84 parts of ethyl acetate was added to prepare a solution of a resin having an ethylenically unsaturated group in a slightly long side chain ( Solid content: 30%) was obtained.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in its slightly long side chain and 0.3 part of 2-hydroxy-2-methylpropiophenone were uniformly mixed.

An adhesive sheet was obtained in the same manner as in Example 1ε, and the measurement results are shown in the table.

Example 6 Butyl acrylate 88.0 parts Vinyl acetate 5.5 parts Dimethylaminoethyl methacrylate 1.3 parts 2-
Hydroxyethyl methacrylate 5.2 parts Azobisisobutyronitrile 0.2 parts Ethyl acetate 233 parts A mixture of the above composition was reacted in the same manner as in Example 1 to form a rubbery polymer having a tertiary amino group and a water M group. Solution (solid content 30
%) was obtained.

237 parts of the obtained rubbery polymer solution having tertiary amino groups and hydroxyl groups, 15 parts of hexahydrophthalic anhydride, 4 parts of glycidyl methacrylate i, and 0.3 parts of hydroquinone were mixed and reacted in the same manner as in Example 1. After that, 67 parts of ethyl acetate was added to obtain a solution (solid content: 30%) of a resin having an ethylenically unsaturated group in a slightly long side chain.

100 parts of the obtained solution of the resin having an ethylenically unsaturated group in its slightly long side chain and 0.3 part of 2-hydroxy-2-methylpropiofenone were uniformly mixed.

An adhesive sheet was obtained in the same manner as in Example 1, and the measurement results are shown in the table.

(The following is a blank space) [Effects of the Invention] The adhesive composition of the present invention has a polymer itself that is photocurable, and as shown in Table 1, the peel adhesive strength before curing is 1500.
g/25 mm or more, the holding force is 600 seconds or more, and the shear adhesive strength after curing is 25 kg/Cm" or more, and both the adhesive properties before curing and the adhesive strength after curing are excellent.

In this way, 1. the present invention has high adhesiveness and can be temporarily bonded to the adherend during bonding; 2. no mechanical temporary fixing is required; strong adhesive strength is exhibited after curing, and the adhesive properties before curing are high. It has now become possible to obtain a photocurable pressure-sensitive adhesive composition with an excellent balance between adhesive strength and adhesive strength after curing.

Claims (1)

[Claims] 1. A rubbery polymer (a) having a tertiary amino group, optionally a cyclic acid anhydride (b), and a monomer (c) having an ethylenically unsaturated group and an epoxy group or an aziridinyl group are reacted. A photocurable pressure-sensitive adhesive composition comprising a resin (A) having an ethylenically unsaturated group in its side chain and, if necessary, a photopolymerization initiator (B).