JPH02107681A - Photo-sensitive tacky adhesive sheet - Google Patents

Abstract

PURPOSE:To obtain the subject sheet capable of detecting the variation of radiation energy of actinic light such as ultraviolet ray and useful for electrical insulation, etc., by laminating a substrate with a layer developing color with actinic light and a tacky adhesive layer decreasing the tacky adhesive force with actinic light. CONSTITUTION:The objective photo-sensitive tacky adhesive sheet is produced by laminating a substrate 1 (e.g. cellophane) with (A) a color-developing layer 2 composed of e.g. 10pts.wt. of a pigment precursor (e.g. triphenylmethane compound), 0.1-100pts.wt. of a photo-activator (e.g tetrabromic acid) and 1-1,000pts. wt. of a polymeric binder (e.g. ethylcellulose) and (B) a tacky adhesive layer 3 (e.g. a layer composed of a copolymer of glycidyl methacrylate and isooctyl acrylate).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a photosensitive adhesive sheet which develops color under the action of actinic light and whose adhesive strength decreases.

BACKGROUND ART Conventionally, adhesive products have been used in the electronics industry for various purposes such as electrical insulation, display labels, double-sided attachment, masking, packaging, surface protection, and binding and fixing.

Paper tape is one of the uses of adhesive products. For example, automatic insertion machines (
An automatic sequencer is used to arrange these parts in order, but paper tape with adhesive is used to hold the parts. It will be done. The required characteristics of these paper tapes are that they have sufficient adhesion when holding parts, and that they can be easily pinked up using tools such as a vacuum pallet when picking up parts, and that they can be assembled into a frame. .

Another use for adhesive products is, for example, dicing tape. A dicing tape is used to fix a patterned wafer when a wafer of silicon or the like is divided into pieces (dicing) after semiconductor element formation (patterning) has been completed. That is, first, a wafer is attached to a double-sided adhesive tape or a self-adhesive film, and then the wafer is cut in half and separated by braking to divide the wafer into chips, and each chip is picked up by a suction method or the like.

Adhesive products can also be used to fix workpieces in lapping work, where the surfaces of ferrite and silicon wafers are processed to make them flat, or in grinding work, where the back side of silicon wafers is processed into a rough surface. There's a tape.

This adhesive tape strongly holds the workpiece during work, but can be easily peeled off after work is completed.

Adhesive products such as adhesive tapes and adhesive films (hereinafter referred to as adhesive sheets) used in the above-mentioned applications have two different functions: high adhesive strength and low adhesive strength, depending on the work process. It is necessary to provide appropriate information.

Conventionally, adhesive sheets with these functions include:
Ultraviolet-sensitive adhesive sheets are known. This type of adhesive sheet has a layer of a composition on the substrate whose adhesive strength changes depending on the action of ultraviolet rays. By irradiating the wafer into chips after dicing with ultraviolet rays immediately before picking up, the adhesive strength rapidly decreases, making it possible to take out the chips. .

Problems to be Solved by the Invention The above-mentioned ultraviolet-sensitive adhesive sheet has a phenomenon in which the adhesive is photochemically changed by the action of ultraviolet energy emitted from a light source such as a mercury lamp or a metal halide lamp, resulting in a decrease in adhesive strength. It uses

By the way, if the above-mentioned straight light source is used continuously, it deteriorates and the Lang tube wall, reflection mirror, filter, etc. become dirty, resulting in a decrease in the radiant energy (output) of ultraviolet rays.

If you use a conventional adhesive sheet and proceed with the die sinking process described above without detecting or correcting the output of ultraviolet rays from the light source, the output of ultraviolet rays described above will decrease, resulting in the adhesive sheet becoming There was a problem that the required adhesive strength did not decrease sufficiently, causing problems in the work.

Conventionally, it has not been possible to directly detect whether the adhesive strength of the adhesive tape has insufficiently decreased due to such a decrease in the output of ultraviolet rays. There was a desire to develop a technology that could easily detect the degree of damage.

The present invention has been made in view of the above-mentioned problems in the prior art.

Therefore, an object of the present invention is to provide a photosensitive four-adhesive sheet that can detect changes in the radiant energy of active light such as ultraviolet rays.

Means and Effects for Solving the Problems The present inventor has conducted intensive research on sheets that undergo various physical property changes due to the action of active light such as ultraviolet rays, and has solved the above problems by using a sheet having a specific layer structure. The inventors have discovered that the above objectives can be achieved, and have completed the present invention.

The first photosensitive adhesive sheet of the present invention is formed by laminating, on a substrate, a coloring layer made of a composition that develops color under the action of active light, and an adhesive layer whose adhesive strength decreases under the action of the active light. It is characterized by

The second photosensitive adhesive sheet is provided with a coloring layer made of a composition that develops color by the action of active light on one side of the base, and an adhesive layer whose adhesive strength decreases by the action of the active light on the other side. It is characterized by

The third photosensitive adhesive sheet is characterized in that an adhesive layer whose adhesive strength is reduced by the action of actinic light is provided on a substrate containing a composition that develops color by the action of actinic light.

Furthermore, the fourth photosensitive adhesive sheet is characterized in that a color-forming adhesive layer is provided on the substrate, which develops color under the action of actinic light and whose adhesive strength decreases.

Hereinafter, the photosensitive adhesive sheet of the present invention will be explained with reference to the drawings.

1 to 4 respectively show schematic cross-sectional views of the first to fourth photosensitive adhesive sheets of the present invention. In FIG. A coloring layer 2 made of a material and an adhesive layer 3 whose adhesive strength is reduced by the action of the actinic light are sequentially laminated. Second
In the figure, the coloring layer 2 is provided on one side of the base 1, and the adhesive layer 3 is provided on the other side. In FIG. 3, an adhesive layer 3 whose adhesive strength is reduced by the action of actinic light is provided on a color-forming base 4 containing a composition that develops color by the action of actinic light. Further, in FIG. 4, a color-forming adhesive layer 5 is provided on the substrate 1, which develops color and whose adhesive strength is reduced by the action of actinic light.

Next, the structure of each layer of the photosensitive adhesive sheet in the present invention will be described in detail.

In the present invention, conventionally known compositions can be used as the composition forming the coloring layer that develops color by the action of actinic light. That is, a combination of a photoactive agent that generates active species such as free radicals or acids by the action of ultraviolet rays or visible light, and a dye precursor that develops color by interaction with the active species can be used.

Photoactive agents that generate free radicals include organic halogen compounds, such as carbon tetrabromide, i,i,i-tris (
(bromomethyl)propane, phenyltribromomethylsulfone, p-nitrophenyltribromomethylsulfone, 2,4-dichlorophenyltrichloromethylsulfone, hexabromodimethylsulfoxide, hexabromodimethylsulfone, 4,4-dibromo-2,3- Hexanedione, 4-phenoxydichloroacetophenone, 0
-Nitro-α,α.

α-Tribromoacetophenone, 2,4-bis(trichloromethyl)-6-(p-methoxyphenyl)-S-triazine, 2,4-bis(trichloromethyl)-6-
(p-methoxystyryl)-s-triazine, 2,4-
bis(trichloromethyl)-6-fnaphth-1-yl)
-8-triazine, 2,4-bis(trichloromethyl)
-6-(acenaphth-5-yl)-S-triazine and the like are exemplified.

In addition, as a photoactive agent that generates an acid, aromatic onium salts such as diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphate, triphenylsulfonium hexafluorophosphate, bis(4-methoxyphenyl)phenylsulfonium Examples include hexafluorophosphate.

In addition, as dye precursors, triphenylmethane-based, fluoran-based, rhodamine lactam-based, phenothiazine-based, and phthalide-based compounds, such as bis(4-dimethylaminophenyl)phenylmethane (leucomalachite green), tris(4- dimethylaminophenyl) phenylmethane (leuco crystal violet), bis(4
-diethylamino-2-methylphenyl)phenylmethane, bis(4-diethylamino-2-methoxyphenyl)phenylmethane, tris(4-diethylamine-2-
methylphenyl)methane, bis(4-dibenzylamino-2-methylphenyl)phenylmethane, 4-methoxyphenylbis(1-ethyl-2-methylindole-3
-yl)methane, phenyl-bis(1-n-butyl-2
-methylindol-3-yl)methane, 3-diethylaminobenzo[al-fluorane, 3-dimethylamino-6-methyl-chlorofluorane, 3-cyclohexylamino-6-chlorofluorane, 3-(N- methyltophenylamino)-6-(N-ethyl-N-D-tolylamino)fluorane, 3-diethylamine-7-chlorofluorane, 3-dimethylamine-6-methyl-7
-chlorofluorane, 3-(N-cyclohexyl-N-
methylamino)-6-methyl-7-anilinofluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane, 3-(N-ethyl-isobentylamino)-6
-Methyl-7-anilinofluorane, 3-(toethyl-N-(2-oxolanylmethylamine))-6-methyl-7-anilinofluorane, 3-diethylamino-(
l-fluoroanilino) fluorane, 3,6-dinitylaminofluorane-ω-p-nitrophenylimidolactam, 3,6-ethylaminofluorane-ω-p-chlorophenylimidolactam, 3,7-bis (dimethylamino)-10-benzophenothiazine, 3.7-bis(dimethylamino)-10-acetylphenothiazine,
3.3- and sudimethylaminophenyl-6-dimethylaminophthalide (crystal violet lactone)
, 3.3-bis-dimethylaminophenyl phthalide (malachite green lactone), 3.3-bis-(1-ethyl-2-methylindol-3-yl)phthalide, 3
．． 3-bis-(1-butyl-2-methylindole-3
-yl)phthalide, 3,3-bis~(1-yl)phthalide, 3,3-bis~(1-yl)phthalide,
-methylindol-3-yl)phthalide, N-butyl-3-Fbis(4-(N-methylanilino)phenyl)
methyl]carbazole, 3-(4-diethylamino-2
-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphthalide and the like.

In the first and second photosensitive adhesive sheets of the present invention,
The coloring layer combines the photoactive agent and dye precursor described above with a film-forming polymer binder such as ethyl cellulose, cellulose acetate, hydroxypropyl cellulose, nitrocellulose cellulose triacetate, cellulose acetate butyrate, cellulose acetate propionate, etc. cellulose derivative, polyvinyl chloride, vinyl chloride-B
: Acid vinyl copolymers, vinyl chloride copolymers such as vinyl chloride-vinyl alcohol copolymers, ethylene copolymers such as ethylene-vinyl alcohol copolymers, ethylene-vinyl chloride copolymers, polystyrene, styrene - Styrenic polymers such as butadiene-acrylonitrile copolymers, acrylic resins such as polyacrylic esters, polymethacrylic esters, and copolymers thereof, butyral resins, epoxy resins, alkyd resins, phenolic resins, saturated Along with coating resins such as copolyester resins and fluororesins, engineering plastics such as polycarbonates, polyarylates, polysulfones, polyethersulfones, aromatic polyesters, polyphenylene ethers, and acrylonitrile-chlorinated polyethylene-styrene copolymers. , solvents (e.g., water, methanol, ethanol, inzolopanol, benzene, toluene, xylene, ethyl acetate, isobutyl acetate, acetone,
2-butanone, 4-methyl-2-pentanone, cyclohexanone, tetrahydrofuran, dioxane, methylene chloride, chloroform, 12-dichloroethane, i, 1
．． 1- Trichloroethane, chlorobenzene, hexane, heptane, cyclohexane, dimethylacetamide,
It is formed by dispersing and dissolving it in dimethyl sulfoxide) and coating the resulting coating liquid on a substrate.

The quantitative ratio of each component in the coloring layer is not particularly limited, but preferred examples are shown below.

Dye precursor 10 parts Photoactivator
o, i to ioo part polymer binder 1
~1000 parts The substrate used in the photosensitive adhesive sheets 1.2 and 4 of the present invention is not particularly limited as long as it is in the form of a sheet. For example, cellophane,
Polyethylene, polystyrene, polypropylene, ■PX
, 3itt [cellulose, polyvinyl chloride, polyester, polycarbonate, polyarylate, polysulfone, polyethersulfone, polytetrafluoroethylene, polyamide, polyimide, polyamideimide, silicone, and other polymer films, paper, and nonwoven fibers Or woven fabric or wood sheet.

Glass sheets, ceramic sheets, metal foils such as aluminum foil and lead foil, polymer films and paper with deposits of aluminum, chromium, tin, indium, gold, silver, copper, etc.
Composite sheet materials made by combining two types of materials such as polyester, acetate cloth, and polyester can be mentioned. However, in the present invention, the substrate is preferably transparent to actinic light.

In the third photosensitive pressure-sensitive adhesive sheet of the present invention, a color-forming substrate containing a composition containing a photoactive agent and a dye precursor as described above is used as the substrate. This color-forming substrate is preferably transparent to actinic light, and develops color upon irradiation with actinic light.

In order to create the straight color-forming substrate, materials with sheet-forming properties such as cellophane, polyethylene, polystyrene, polypropylene, TPX, cellulose triacetate, polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyarylate, polysulfone,
Polymer materials such as polyether sulfone and silicone, sheet-like porous materials such as paper, non-woven or woven fabrics of fibers, and wood sheets, composite sheets made of two types of materials such as paper-polyester, acetate cloth polyester, etc. Materials etc. can be used.

In order to create a color-forming substrate using these sheet-forming materials, conventionally known techniques can be adopted4.For example, when using a sheet-forming polymeric material, the polymeric material and the dye precursor and A solution casting method in which a coating solution obtained by dissolving a photoactivator in various solvents is cast onto a rotating flat and uniform metal support to form a thin film, and a polymer material, a dye precursor, and The melt extrusion method involves extruding the molten liquid obtained by heating and melting the photoactive agent through a T-tie or circular tie to form a film. After thoroughly kneading the polymer material, dye precursor, and photoactive agent, two A calender method or the like in which the film is rolled between the above rolls can be used.

The quantitative proportions of the polymer material, dye precursor, and photoactive agent are not particularly limited, and preferable examples are shown below.

Sheet-forming polymer material 100 parts Dye precursor 0.1 to 10 parts Photoactivator
0.001 to 100 parts When using a sheet-like porous material, a coating obtained by dissolving a composition that develops color by the action of actinic light and, if necessary, a film-forming polymer binder in various solvents. A substrate can be formed by coating, dipping or impregnating a sheet-like porous material with the liquid.

In this case, the quantitative ratio of each component constituting the composition that develops color by the action of actinic light is not particularly limited, but preferred examples are as follows.

Dye precursor 10 parts Photoactivator
0.1-100 parts polymer binder 1
~1000 parts In the photosensitive adhesive sheets 1.2 and 3 of the present invention, the adhesive layer whose adhesive strength is reduced by the action of active light is European Patent No. 9 EP46.08.
3 (1982), patent application fAPcT81-00, 3
09 (1981), Fr, Demande FR2,4
80, 762 (1981) etc. can be applied as is. For example, those using a composition containing a compound such as 3'-methoxybenzoin octadecanoate, which is photolyzed to produce a surfactant by the action of active light, and those using a composition containing a compound such as 3'-methoxybenzoin octadecanoate, which uses a composition containing a compound that is photolyzed to produce a surfactant by the action of active light; long-chain acrylic copolymers such as, and photoionic reaction initiators such as triphenylsulfonium hexafluoroantimonate, diphenyl(thiophenoxyphenyl)sulfonium hexafluorantimonate, 4-chlorophenyldiphenylsulfonium hexafluoroantimonate, etc. epoxy group-containing polyolefin compound having 8 to 28 carbon atoms, 34-epoxycyclohexylmethyl-
Compounds such as cyclic epoxy compounds such as 3,4-cyclohexane carboxylate, photoionic reaction initiators such as di-t-butyl-4,4'-diphenyliodonium hexafluoroantimonate, etc. etc. can be opened.

In the fourth photosensitive adhesive sheet of the present invention, a color-forming adhesive layer is provided on the substrate, which develops color under the action of actinic light and whose adhesive strength decreases. Such a color-forming adhesive layer can be formed by appropriately mixing the constituent components of the above-described color-forming layer and adhesive layer.

EXAMPLES Hereinafter, the present invention will be explained by examples. In addition, all parts mean parts by weight.

Example 1 A photochromic composition having the following composition was coated on one side of a polyester film with a thickness of 75 fields to form a coloring layer with a film thickness of 10a+. 2-methylphenyl)phenylmethane
8 parts 1-limethylbromophenyl sulfone 2 parts Saturated polyester resin toluene/2-butanone (weight ratio 80/20) 10% by weight solution 100 parts Next, on the other side of the polyester film, add the following composition. An adhesive layer coating liquid consisting of the following was applied to form an adhesive layer with a thickness of 30 mm, thereby obtaining a photosensitive adhesive sheet (hereinafter simply referred to as a sheet).

Glycidyl methacrylate 2-ethylhexyl acrylate (20/80) copolymer 100 parts Fluoroantimonate to diphenylthiophenoxyphenyl 3 parts Ethyl acid 40000 parts Isopropyl alcohol 100 parts 2-butanone
The hue of the sheet obtained in 200 parts before irradiation with actinic light was clear and colorless.

This sheet was pasted on the back side of the buttered silicon wafer, and a high-pressure mercury lamp (manufactured by Ushio Inc., output 8
Actinic light irradiation was performed for 30 seconds from a distance of 25CI11 using 0-/■).

As a result of the irradiation, the hue of the sheet became clear green.6 Next, an adhesive tape with a tape width of 10 mm was attached to the sheet, and 180° peeling was performed at a peeling speed of 30 co/Sec to measure the peel strength. As a result, the peel strength of the sheet that was not irradiated with active light was 300 g/c! 11, but it decreased to 10z/an after irradiation.

Example 2 A photochromic sheet with a thickness of 100 mm, which is a color-forming substrate, was obtained by a solution casting method using a composition having the following composition.

3 Cellulose acetate flakes 50 parts Methyl phthalylethyl glycolate 5 parts Triphenyl phosphate 10 parts Methylene chloride
200 parts ethyl alcohol
20 parts N-butyl-3[his+4-(N-methylanilino)phenyl)methyl] carbazole 5 parts 24-bis(
trichloromethyl)-6-(naphth-1-yl)-s-
Triazine 1 part Next, on the above photochromic sheet, an adhesive layer coating liquid having the following composition was applied to form a dry layer with a thickness of 25 mm to obtain a photosensitive adhesive sheet. .

Glycidyl methacrylate in octyl acrylate (25/75) copolymer 100 parts3.
4-epoxycyclohexylmethyl-3,4-cyclohexane carboxylate 10 parts (1-6-
η-cumene)(η-cyclopentadienyl)iron(1+) hexafluorophosphate 3-part ethyl acetate
90 parts isopropyl alcohol 60 parts anthracene
The hue of the obtained 0.5 part sheet before irradiation with actinic light was colorless and transparent.5 This sheet was pasted on the back side of a patterned silicon wafer, and the same dyeing as in Example 1 was applied. Active light irradiation was performed with an irradiation time of 5 seconds.

As a result of the irradiation, the hue of the sheet became clear blue.Next, the peel strength was measured in the same manner as in Example 1. As a result, the peel strength before irradiation was 250 g/■, but after irradiation with actinic light, the peel strength decreased to 5 g/a11.

Example 3 A photochromic sheet with a thickness of 125 μm as a color-forming base was obtained by a T-tie melt extrusion method using a composition having the following composition: 100 parts of polyvinyl chloride, 35 parts of dioctyl phthalate, 5 parts of dioctyl adipate, 3- (N-
Ethyroot(2-oxolanylmethylamine)-6-methyl-7-anirithufluorane 10 parts bis(4-
methoxyphenyl) phenylsulfonium hexafluorophosphate (2 parts) Next, on the above photochromic sheet, an adhesive layer coating liquid having the following composition was applied to form an adhesive layer with a thickness of 15 mm, A photosensitive adhesive sheet was obtained.

10% by weight solution of saturated polyester resin (T (1=-20°C) in ethyl acetate/toluene (weight ratio 80/20) 100 parts 3
5 parts of '-Methoxybenzoin octatecanoate The hue of the obtained sheet before irradiation with actinic light was clear and colorless.

This sheet was attached to the back side of a patterned silicon wafer, and irradiated with actinic light under the same conditions as in Example 1, except that the irradiation time was 60 seconds.

As a result of the irradiation, the hue of the sheet became clear black.Next, the peeling strength was measured in the same manner as in Example 1. As a result, peeling when not irradiated! The intensity is 250 z /
However, by irradiation with actinic light, the peel strength was reduced to 10 g.
/■ decreased.

Example 4 As the dye precursor of the photochromic composition in Example 1,
3.3-His(1-octyl-2-methylindole-
A photosensitive adhesive sheet was obtained according to the same procedure as in Example 1 except that 3-yl)phthalide was used.

The hue of this sheet was colorless and transparent.

Then, following the same procedure as in Example 1,
Active light irradiation was performed. As a result of the irradiation, the sheet developed a bright red color. Next, peel strength was measured in the same manner as in Example 1. As a result, the same peel strength as in Example 1 was obtained.

Example 5 In Example 2, except that a coating solution containing 3-cyclohexylamino-6-chlorofluorane was used as the dye precursor, and the following formulation was used as the adhesive layer coating solution, A photosensitive adhesive sheet was obtained in the same manner as in Example 2.

Hisphenol A type epoxy resin 50 parts 1,2-epoxy-16-octadecene 50 parts 3,4-epoxycyclohexylmethyl-3,4-cyclohexane carboxylate 20 parts diphenylthiophenoxyphenylsulfonium hexafluorophosphate 20 parts perylene
One part of this sheet was colorless and transparent before irradiation with actinic light.

Next, activating light irradiation was performed in the same manner as in Example 1, and the hue and peel strength were measured. As a result, the sheet developed a clear orange color upon irradiation with active light. In addition, the peel strength value was 350g/before irradiation with active light.
■, 10g/a after irradiation! It was I.

Example 6 Example 3 except that 3,6-dinithylaminofluorane-ω-kanonitrophenylimidolactam was used as the dye precursor, and the following formulation was used as the adhesive layer coating liquid. A photosensitive adhesive sheet was obtained in the same manner as in Example 3.

Isooctyl acrylate-acrylamide copolymer (copolymerization ratio 90/10) 20 parts 2-
Nitropenzyl hexatecan sulfonate 2-part ethyl acetate
40 parts toluene
40 parts The hue of this sheet before irradiation with actinic light was clear and colorless.

Next, irradiation with actinic light was performed in the same manner as in Example 3, and the hue and peel strength were measured. As a result, the sheet developed a clear pink color upon irradiation with actinic light. In addition, the peel strength value was 400 g before irradiation with active light.
/an was 15 g/cm after irradiation.

Example 7 A photosensitive adhesive sheet was prepared in the same manner as in Example 1, except that the adhesive layer coating solution was applied on the coloring layer instead of on the other side of the polyester film. did. The hue of this sheet before irradiation with actinic light was clear and colorless.

Next, following the same procedure as in Example 1,
Active/focus irradiation was performed. As a result of the irradiation, the sheet developed a bright green color. Furthermore, as a result of measuring the peel strength using the same procedure as in Example 1, the same peel strength as in Example 1 was obtained.

Example 8 A coating layer for forming a color-forming adhesive layer obtained by mixing equal amounts of the photochromic composition coating liquid and the adhesive layer coating liquid in Example 1 was applied to a 75 m thick polyester film. Film thickness 30
A color-forming adhesive layer was formed to obtain a photosensitive adhesive sheet. The hue of this sheet before irradiation with actinic light was clear and colorless.

Next, activating light irradiation was performed in the same manner as in Example 1. As a result of the irradiation, the sheet developed a bright green color. Further, as a result of measuring the peel strength using the same manual IIN as in Example 1, the same peel strength as in Example 1 was obtained.

Effects of the Invention Since the photosensitive adhesive sheet of the present invention has the above configuration, when irradiated with actinic light, the hue of the colored layer changes in response to a decrease in the adhesive strength of the adhesive layer, and the color of the adhesive layer changes. Changes in adhesive strength can be easily detected. Previously, the photosensitive adhesive sheet of the present invention was used in applications where it was desired that the adhesive strength of the adhesive layer decrease during the working process.

For example, it is extremely useful as an adhesive tape or guising tape used when assembling semiconductor chips and other electronic components into frames or the like. That is, when the photosensitive adhesive sheet of the present invention is used, if the adhesive strength of the adhesive layer has not decreased to a predetermined adhesive strength due to a decrease in the output of active light such as ultraviolet rays, it can be easily detected by a change in hue. This eliminates any hindrance to the work process.

[Brief explanation of drawings]

1 to 4 are schematic cross-sectional views of examples of the photosensitive adhesive sheet of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Substrate, 2...Coloring layer, 3...Adhesive layer, 4...
... Color-forming substrate, 5... Color-forming adhesive layer. 1...Basics 2...Color development 1 3...O-occupation layer 4...Color development basics Patent originator Tomogawa Paper Mills Co., Ltd. Agent Patent attorney Tsuyoshi Liquidbe Figure 1 Figure 2 Figure 3 Figure 4

Claims (4)

[Claims] (1) A photosensitive adhesive sheet characterized by laminating, on a substrate, a coloring layer made of a composition that develops color under the action of active light, and an adhesive layer whose adhesive strength decreases under the action of the active light. (2) Photosensitive, characterized in that a color-forming layer made of a composition that develops color under the action of actinic light is provided on one side of the substrate, and an adhesive layer whose adhesive strength is reduced by the action of the actinic light is provided on the other side. adhesive sheet. (3) A photosensitive adhesive sheet comprising an adhesive layer whose adhesive strength is reduced by the action of actinic light on a substrate containing a composition that develops color by the action of actinic light. (4) A light-sensitive adhesive sheet comprising a color-forming adhesive layer that develops color under the action of actinic light and whose adhesive strength decreases on a substrate.