WO2017073722A1 - Double-sided pressure-sensitive adhesive tape - Google Patents

Abstract

The purpose of the present invention is to provide a double-sided pressure-sensitive adhesive tape which can exhibit high high-temperature adhesiveness and which, even when stress is applied thereto at high temperatures of 80ºC and higher, is less apt to peel off. The double-sided pressure-sensitive adhesive tape of the present invention comprises a pressure-sensitive adhesive layer comprising: a polymer component that comprises a crosslinkable-functional-group-containing acrylic polymer obtained by living radical polymerization and having a weight-average molecular weight of 500,000-1,500,000 and a molecular-weight distribution (Mw/Mn) of 1.05-2.5; a crosslinkable-functional-group-containing rosin-based tackifier resin or a crosslinkable-functional-group-containing terpene-based tackifier resin; and a crosslinking agent. When a 200g shearing load is applied at 80ºC for three minutes to the double-sided pressure-sensitive adhesive tape applied so as to have an adhesion area of 1 cm², the degree of shear deformation is 100-300%.

Description

Double-sided adhesive tape

The present invention relates to a double-sided pressure-sensitive adhesive tape that can exhibit high heat-resistant adhesive properties that are difficult to peel even when stress is applied at a high temperature of 80 ° C. or higher.

Double-sided pressure-sensitive adhesive tapes are used in various industrial fields because they can be easily joined. Temporary fixing of curing sheets and bonding of interior materials in the construction field, fixing of interior parts such as seats and sensors, fixing of exterior parts such as side moldings and side visors in the automotive field, module assembly in the electrical and electronic field, Double-sided adhesive tape is used for attaching the module to the housing.
Specifically, for example, a double-sided pressure-sensitive adhesive tape is used for assembly in a portable electronic device (for example, a mobile phone, a portable information terminal, or the like) equipped with an image display device or an input device. More specifically, for example, a double-sided adhesive tape is used to bond a cover panel for protecting the surface of a portable electronic device to the touch panel module or the display panel module, or to bond the touch panel module and the display panel module. It is used. Such a double-sided pressure-sensitive adhesive tape is used, for example, by being punched into a frame shape or the like and arranged around the display screen (for example, Patent Documents 1 and 2). In addition, double-sided adhesive tape is also used for fixing vehicle parts (for example, a vehicle-mounted panel) to a vehicle body.

In applications such as adhesive bonding of parts and adhesion fixing of vehicle parts in large-sized portable electronic devices in recent years, according to increasing needs for miniaturization, thinning or weight reduction of parts, or resource saving, A thin double-sided adhesive tape is desired. On the other hand, in recent portable electronic devices, the so-called narrower frame, in which the periphery of the display screen is narrowed to secure a wider screen, is progressing, and the width of the peripheral part of the screen is extremely narrow in the narrowed framed mobile electronic device. Therefore, a double-sided pressure-sensitive adhesive tape whose line width is narrower (adhesion area is narrower) than before is desired.

JP 2009-242541 A JP 2009-258274 A

An object of this invention is to provide the double-sided adhesive tape which can exhibit the high heat-resistant adhesiveness which is hard to peel even if stress is applied under high temperature of 80 degreeC or more in view of the said present condition.

The present invention relates to a polymer component containing an acrylic polymer having a crosslinkable functional group obtained by living radical polymerization and having a weight average molecular weight of 500,000 to 1,500,000 and a molecular weight distribution (Mw / Mn) of 1.05 to 2.5. And a rosin-based tackifier resin having a crosslinkable functional group, or a terpene tackifier resin having a crosslinkable functional group, and a pressure-sensitive adhesive layer containing a crosslinker, and bonded on an adhesive area of 1 cm ² The double-sided pressure-sensitive adhesive tape has a shear deformation rate of 100 to 300% when a shear load of 200 g is applied to the pressure-sensitive adhesive tape at 80 ° C. for 3 minutes.
The present invention is described in detail below.

The present inventors provide a polymer component containing an acrylic polymer having a crosslinkable functional group obtained by living radical polymerization, and a rosin-based tackifier resin having a crosslinkable functional group or a terpene adhesive having a crosslinkable functional group. In a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer in which an imparting resin and a crosslinking agent are blended, the shear deformation rate is constant when 200 g of shearing force is applied at 80 ° C. for 3 minutes to a double-sided pressure-sensitive adhesive tape affixed at a bonding area of 1 cm ^2. Thus, the inventors have found that even a thin double-sided pressure-sensitive adhesive tape can exhibit high heat-resistant adhesiveness, and have completed the present invention.

The double-sided pressure-sensitive adhesive tape of the present invention has a shear deformation rate of 100 to 300% when a 200 g shear load is applied at 80 ° C. for 3 minutes to a double-sided pressure-sensitive adhesive tape attached with an adhesion area of 1 cm ² . When the shear deformation rate is within the above range, the double-sided pressure-sensitive adhesive tape can exhibit high heat-resistant adhesiveness. If the shear deformation rate is less than 100%, the double-sided pressure-sensitive adhesive tape becomes too hard, and the adhesiveness becomes low at room temperature, so that the double-sided pressure-sensitive adhesive tape becomes too soft, and if it exceeds 300%, the double-sided pressure-sensitive adhesive tape becomes too soft. It becomes easy to peel off under. A more preferable lower limit of the shear deformation rate is 140%.

A schematic diagram showing an outline of an apparatus used for the measurement of the shear deformation rate is shown in FIG. The shear deformation rate can be measured, for example, as follows using a measuring apparatus as shown in FIG.
First, the release film on one side of the double-sided pressure-sensitive adhesive tape to be tested is peeled off, and a corona-treated polyethylene terephthalate (PET) film is applied to the exposed pressure-sensitive adhesive layer, and then cut into a width of 1 cm and a length of 12 cm The test piece 5 is obtained.
The temperature controller 4 (for example, a combination of a Peltier element and a cooling chiller unit) is set to 80 ° C. and left until it stabilizes at the set temperature.
The other release film of the test piece 5 is removed by peeling about 3 cm from the end, and the exposed pressure-sensitive adhesive layer is attached to the adherend 3 so that the adhesion area becomes 1 cm × 1 cm.
A quartz block 2 having a mirror-finished end surface is placed on the pasting surface, and the test piece 5 is attached to a wire connecting to a weight 6 of 200 g. Let stand in this state and incubate for 5 minutes.
After 5 minutes, the PC connected to the apparatus is operated to start applying a load, and a shear load in the waterside direction is applied to the test piece 5 for 3 minutes. Here, the displacement amount due to the adhesive deformation is detected by the laser interferometer 1 as the movement amount of the mirror-treated quartz block 2 on the test piece 5. After 3 minutes, the displacement amount accompanying the deformation of the adhesive can be read, and the “shear deformation rate” can be calculated based on the following calculation formula.

Shear deformation rate (%) = (displacement displacement of test piece 5 after 3 minutes) / (adhesive layer thickness of test piece 5) × 100

The double-sided pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive containing a polymer component containing an acrylic polymer having a crosslinkable functional group obtained by living radical polymerization (hereinafter also simply referred to as “living radical polymerization acrylic polymer”). Has a layer.
The living radical polymerization acrylic polymer is obtained by living radical polymerization using an acrylic monomer such as (meth) acrylic acid ester or (meth) acrylic acid as a raw material, preferably living radical polymerization using an organic tellurium polymerization initiator. Acrylic polymer.
Living radical polymerization is polymerization in which molecular chains grow without the polymerization reaction being hindered by side reactions such as termination reactions or chain transfer reactions. According to living radical polymerization, for example, a polymer having a more uniform molecular weight and composition than that of free radical polymerization can be obtained, and the generation of low molecular weight components and the like can be suppressed, so that the double-sided adhesive tape is peeled off even at high temperatures. It becomes difficult.

FIG. 2 shows a schematic diagram for explaining living radical polymerization. Living radical polymerization is polymerization in which molecular chains grow without the polymerization reaction being hindered by side reactions such as termination reactions or chain transfer reactions. In living radical polymerization, the reaction proceeds without the growth terminal radicals being deactivated and without generating new radical species during the reaction. In the middle of the reaction, all polymer chains are polymerized while uniformly reacting with the monomer, and the composition of all polymers approaches uniform. Therefore, the crosslinkable functional group-containing monomer 112 is included in all the polymers of the acrylic polymer 11 to be obtained. When the acrylic polymer 11 obtained by such living radical polymerization is combined with a rosin-based tackifier resin having a crosslinkable functional group or a terpene tackifier resin having a crosslinkable functional group, and a crosslinking agent, almost all These polymers can be involved in crosslinking between polymer chains and crosslinking between polymer chains and tackifying resins. FIG. 3 is a schematic diagram for explaining a case where an acrylic polymer obtained by living radical polymerization is crosslinked. In the acrylic polymer obtained by living radical polymerization, the composition of all polymers is uniform, and since the crosslinkable functional group-containing monomer is included, all polymer chains are involved in crosslinking. In FIG. 3, a hydroxyl group is shown as an example of the crosslinkable functional group.
In this way, almost all polymers can participate in the cross-linking between polymer chains, so even with a thin double-sided adhesive tape, the shear deformation rate can be adjusted to the above range and high heat-resistant adhesion can be exhibited. it can.

The effect of the present invention cannot be obtained even when an acrylic polymer obtained by conventional free radical polymerization is used.
FIG. 4 shows a schematic diagram for explaining free radical polymerization. In free radical polymerization, radical species are continuously generated during the reaction and added to the monomer, and the polymerization proceeds. Therefore, in the free radical polymerization, a polymer 123 in which the growing terminal radical is deactivated during the reaction and a polymer 124 grown by the radical species newly generated during the reaction are generated. Therefore, when an acrylic polymer containing a crosslinkable functional group is produced by free radical polymerization, a polymer containing no relatively low molecular weight crosslinkable functional group-containing monomer is produced. Even when the acrylic polymer 12 obtained by such free radical polymerization is crosslinked using a crosslinking agent, a polymer that does not contain a crosslinkable functional group-containing monomer cannot participate in crosslinking between polymer chains. . FIG. 5 shows a schematic diagram for explaining a case where an acrylic polymer obtained by free radical polymerization is crosslinked. The acrylic polymer obtained by free radical polymerization has a non-uniform polymer composition and contains a polymer that does not contain a relatively low molecular weight crosslinkable functional group-containing monomer. ing. In FIG. 5, a hydroxyl group is shown as an example of the crosslinkable functional group. When a double-sided adhesive tape is applied to an adherend, peeling occurs from a site that does not contain a crosslinkable functional group-containing monomer that cannot participate in crosslinking. End up.

As described above, the living radical polymerization acrylic polymer has a more uniform molecular weight and composition as compared with free radical polymerization and the like, has a low content of low molecular weight components, and almost all polymers have a crosslinkable functional group-containing monomer. It has the property of being included. The effect of the present invention that can exhibit high heat-resistant adhesion that is difficult to peel off even when stress is applied at a high temperature of 80 ° C. or higher is exhibited for the first time by using a living radical polymerization acrylic polymer.
The characteristics of such a living radical polymerization acrylic polymer are due to a production method called living radical polymerization in which a molecular chain grows without being hindered by a side reaction such as a termination reaction or a chain transfer reaction. However, although it is possible to indirectly represent the characteristics of the living radical polymerization acrylic polymer as an average value of the whole polymer such as weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn), It is extremely difficult to directly specify the structure and properties of the chain length and the monomer component in each polymer. It must be said that it is impossible or not practical to directly identify the living radical polymerized acrylic polymer by its structure or properties. Therefore, in the present invention, it should be allowed to describe the living radical polymerization acrylic polymer by “the acrylic polymer obtained by living radical polymerization,” and the production method thereof.

Among living radical polymerizations, living radical polymerization using an organic tellurium polymerization initiator protects all radical polymerizable monomers having polar functional groups such as hydroxyl groups and carboxyl groups, unlike other living radical polymerizations. Without polymerization, the same initiator can be polymerized to obtain a polymer having a uniform molecular weight and composition. For this reason, the radically polymerizable monomer having a polar functional group can be easily copolymerized.

The organic tellurium polymerization initiator is not particularly limited as long as it is generally used for living radical polymerization, and examples thereof include organic tellurium compounds and organic telluride compounds.
Examples of the organic tellurium compounds include (methylterranyl-methyl) benzene, (1-methylterranyl-ethyl) benzene, (2-methylterranyl-propyl) benzene, 1-chloro-4- (methylterranyl-methyl) benzene, 1-hydroxy- 4- (methylterranyl-methyl) benzene, 1-methoxy-4- (methylterranyl-methyl) benzene, 1-amino-4- (methylterranyl-methyl) benzene, 1-nitro-4- (methylterranyl-methyl) benzene, 1- Cyano-4- (methylterranyl-methyl) benzene, 1-methylcarbonyl-4- (methylterranyl-methyl) benzene, 1-phenylcarbonyl-4- (methylterranyl-methyl) benzene, 1-methoxycarbonyl-4- (methylterranyl-methyl) ) Benzene, 1- Enoxycarbonyl-4- (methylterranyl-methyl) benzene, 1-sulfonyl-4- (methylterranyl-methyl) benzene, 1-trifluoromethyl-4- (methylterranyl-methyl) benzene, 1-chloro-4- (1 -Methylterranyl-ethyl) benzene, 1-hydroxy-4- (1-methylterranyl-ethyl) benzene, 1-methoxy-4- (1-methylterranyl-ethyl) benzene, 1-amino-4- (1-methylterranyl-ethyl) Benzene, 1-nitro-4- (1-methylterranyl-ethyl) benzene, 1-cyano-4- (1-methylterranyl-ethyl) benzene, 1-methylcarbonyl-4- (1-methylterranyl-ethyl) benzene, 1- Phenylcarbonyl-4- (1-methylterranyl-ethyl) benzene, 1-meth Sicarbonyl-4- (1-methylterranyl-ethyl) benzene, 1-phenoxycarbonyl-4- (1-methylterranyl-ethyl) benzene, 1-sulfonyl-4- (1-methylterranyl-ethyl) benzene, 1-trifluoromethyl -4- (1-methylterranyl-ethyl) benzene, 1-chloro-4- (2-methylterranyl-propyl) benzene, 1-hydroxy-4- (2-methylterranyl-propyl) benzene, 1-methoxy-4- (2 -Methylterranyl-propyl) benzene, 1-amino-4- (2-methylterranyl-propyl) benzene, 1-nitro-4- (2-methylterranyl-propyl) benzene, 1-cyano-4- (2-methylterranyl-propyl) Benzene, 1-methylcarbonyl-4- (2-methylterranyl-propyl ) Benzene, 1-phenylcarbonyl-4- (2-methylterranyl-propyl) benzene, 1-methoxycarbonyl-4- (2-methylterranyl-propyl) benzene, 1-phenoxycarbonyl-4- (2-methylterranyl-propyl) benzene 1-sulfonyl-4- (2-methylterranyl-propyl) benzene, 1-trifluoromethyl-4- (2-methylterranyl-propyl) benzene, 2- (methylterranyl-methyl) pyridine, 2- (1-methylterranyl-ethyl) ) Pyridine, 2- (2-methyl teranyl-propyl) pyridine, 2-methyl teranyl-methyl ethanoate, 2-methyl teranyl-methyl propionate, 2-methyl teranyl-2-methyl propionate, 2-methyl teranyl-ethyl ethanoate, 2 -Methylterranil Ethyl propionate, 2-Mechiruteraniru -2-methylpropionic acid ethyl, 2-methyl-Terra alkylsulfonyl acetonitrile, 2-methyl-Terra sulfonyl propionitrile, 2-methyl-2-methyl-Terra sulfonyl propionitrile, and the like. The methyl terranyl group in these organic tellurium compounds may be an ethyl terranyl group, n-propyl terranyl group, isopropyl terranyl group, n-butyl terranyl group, isobutyl terranyl group, t-butyl terranyl group, phenyl terranyl group, etc. These organic tellurium compounds may be used alone or in combination of two or more.

Examples of the organic telluride compound include dimethyl ditelluride, diethyl ditelluride, di-n-propyl ditelluride, diisopropyl ditelluride, dicyclopropyl ditelluride, di-n-butyl ditelluride, di-sec-butyl ditelluride. , Di-tert-butylditelluride, dicyclobutylditelluride, diphenylditelluride, bis- (p-methoxyphenyl) ditelluride, bis- (p-aminophenyl) ditelluride, bis- (p-nitrophenyl) ditelluride, bis -(P-cyanophenyl) ditelluride, bis- (p-sulfonylphenyl) ditelluride, dinaphthyl ditelluride, dipyridyl ditelluride and the like. These organic telluride compounds may be used alone or in combination of two or more. Of these, dimethyl ditelluride, diethyl ditelluride, di-n-propyl ditelluride, di-n-butyl ditelluride and diphenyl ditelluride are preferable.

In addition, within the range which does not impair the effect of this invention, in addition to the said organic tellurium polymerization initiator, you may use an azo compound as a polymerization initiator for the purpose of acceleration | stimulation of a polymerization rate.
The azo compound is not particularly limited as long as it is generally used for radical polymerization. For example, 2,2′-azobis (isobutyronitrile), 2,2′-azobis (2-methylbutyronitrile) is used. ), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 1,1-azobis (cyclohexane-1-carbonitrile) ), 1-[(1-cyano-1-methylethyl) azo] formamide, 4,4′-azobis (4-cyanovaleric acid), dimethyl-2,2′-azobis (2-methylpropionate), Dimethyl-1,1′-azobis (1-cyclohexanecarboxylate), 2,2′-azobis {2-methyl-N- [1,1′-bis (hydroxymethyl) -2-hydroxyethyl Propionamide}, 2,2′-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2′-azobis [N- (2-propenyl) -2-methylpropionamide], 2 , 2′-azobis (N-butyl-2-methylpropionamide), 2,2′-azobis (N-cyclohexyl-2-methylpropionamide), 2,2′-azobis [2- (2-imidazoline-2 -Yl) propane] dihydrochloride, 2,2'-azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane} dihydrochloride, 2,2'-azobis [2 -(2-imidazolin-2-yl) propane], 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [N- (2-carboxyethyl) -2-methylpropionami Tetrahydrate, 2,2′-azobis (1-imino-1-pyrrolidino-2-methylpropane) dihydrochloride, 2,2′-azobis (2,4,4-trimethylpentane), etc. It is done. These azo compounds may be used alone or in combination of two or more.

Since the living radical polymerization acrylic polymer contains a crosslinkable functional group, an acrylic monomer having a crosslinkable functional group is blended as an acrylic monomer that is polymerized in the living radical polymerization.
Examples of the crosslinkable functional group include a hydroxyl group, a carboxyl group, a glycidyl group, an amino group, an amide group, and a nitrile group. Especially, since adjustment of the gel fraction of the said adhesive layer is easy, a hydroxyl group or a carboxyl group is preferable and a hydroxyl group is more preferable.

Examples of the monomer having a hydroxyl group include (meth) acrylic acid esters having a hydroxyl group such as 4-hydroxybutyl (meth) acrylate and 2-hydroxyethyl (meth) acrylate.
As a monomer which has a carboxyl group, (meth) acrylic acid is mentioned, for example.
Examples of the monomer having a glycidyl group include glycidyl (meth) acrylate.
Examples of the monomer having an amide group include hydroxyethyl acrylamide, isopropyl acrylamide, dimethylaminopropyl acrylamide and the like.
Examples of the monomer having a nitrile group include acrylonitrile.

When the (meth) acrylic acid ester having a hydroxyl group is used, the content is not particularly limited, but a preferable upper limit in the radical polymerizable monomer to be polymerized in the living radical polymerization is 30% by weight. When the content exceeds 30% by weight, the gel fraction of the pressure-sensitive adhesive layer becomes too high and the double-sided pressure-sensitive adhesive tape tends to be peeled off, and the heat-resistant adhesiveness may be lowered.

When the acrylic monomer having a carboxyl group is used, the content thereof is not particularly limited, but the preferable lower limit in the radical polymerizable monomer polymerized in the living radical polymerization is 0.1% by weight, and the preferable upper limit is 10% by weight. is there. When the content is less than 0.1% by weight, the pressure-sensitive adhesive layer may become too soft and heat resistant adhesiveness may be deteriorated. If the content exceeds 10% by weight, the pressure-sensitive adhesive layer may become too hard and the double-sided pressure-sensitive adhesive tape may be easily peeled off.

As the acrylic monomer that is polymerized in the living radical polymerization, other radical polymerizable monomers other than the acrylic monomer having a crosslinkable functional group may be used. As said other radically polymerizable monomer, other (meth) acrylic acid ester is mentioned, for example. In addition, acrylic monomers having other polar functional groups such as amino groups, amide groups, and nitrile groups can also be used. Furthermore, in addition to the acrylic monomer, a vinyl compound may be used as a monomer.

The other (meth) acrylic acid esters are not particularly limited, and are methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, tert-butyl (meth) acrylate, 2 (Meth) acrylic acid alkyl esters such as ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, isomyristyl (meth) acrylate, stearyl (meth) acrylate, Cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, 2-butoxyethyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, glycidyl (meth) acrylate , Tetrahydrofurfuryl (meth) acrylate, polypropylene glycol mono (meth) acrylate. These (meth) acrylic acid esters may be used alone or in combination of two or more.

The vinyl compound is not particularly limited, and examples thereof include (meth) acrylamide compounds such as N, N-dimethylacrylamide, N, N-diethylacrylamide, N-isopropylacrylamide, N-hydroxyethylacrylamide, and acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinylacetamide, N-acryloylmorpholine, acrylonitrile, styrene, vinyl acetate and the like can be mentioned. These vinyl compounds may be used alone or in combination of two or more.

In the living radical polymerization, a dispersion stabilizer may be used. Examples of the dispersion stabilizer include polyvinyl pyrrolidone, polyvinyl alcohol, methyl cellulose, ethyl cellulose, poly (meth) acrylic acid, poly (meth) acrylic acid ester, and polyethylene glycol.
As the living radical polymerization method, conventionally known methods are used, and examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, bulk polymerization and the like.
When a polymerization solvent is used in the living radical polymerization, the polymerization solvent is not particularly limited. For example, a nonpolar solvent such as hexane, cyclohexane, octane, toluene, xylene, water, methanol, ethanol, propanol, butanol, acetone, Highly polar solvents such as methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dioxane, N, N-dimethylformamide can be used. These polymerization solvents may be used alone or in combination of two or more.
The polymerization temperature is preferably 0 to 110 ° C. from the viewpoint of the polymerization rate.

The living radical polymerization acrylic polymer has a lower limit of 500,000 and an upper limit of 1.5 million for the weight average molecular weight (Mw). By making the said weight average molecular weight into this range, the said shear deformation rate can be adjusted in the said range, and high heat-resistant adhesiveness can be exhibited.

The living radical polymerization acrylic polymer has a molecular weight distribution (Mw / Mn) of 1.05 to 2.5. By setting the molecular weight distribution within this range, the shear deformation rate can be adjusted within the above range, and high heat-resistant adhesiveness can be exhibited. A preferable upper limit of the molecular weight distribution is 2.0, and a more preferable upper limit is 1.8.

The molecular weight distribution (Mw / Mn) is a ratio between the weight average molecular weight (Mw) and the number average molecular weight (Mn).
A weight average molecular weight (Mw) and a number average molecular weight (Mn) are measured as a polystyrene conversion molecular weight by the gel permeation chromatography (GPC) method. Specifically, the weight average molecular weight (Mw) and the number average molecular weight (Mn) are obtained by filtering a diluted solution obtained by diluting a living radical polymerization acrylic polymer with tetrahydrofuran (THF) 50 times through a filter. It is measured as a polystyrene equivalent molecular weight by the GPC method using the filtrate obtained. In the GPC method, for example, 2690 Separations Model (manufactured by Waters) or the like can be used.

The polymer component may contain a polymer other than the living radical polymerization acrylic polymer, for example, a polymer obtained by free radical polymerization.
However, the minimum with preferable content of the said living radical polymerization acrylic polymer in the said polymer component is 60 weight%, and it is preferable that the whole quantity (100 weight%) of a polymer component is the said living radical polymerization acrylic polymer. By setting the content of the living radical polymerization acrylic polymer in the polymer component to 60% by weight or more, higher high-temperature adhesiveness can be exhibited.
The rosin tackifier resin or terpene tackifier resin is not included in the polymer component.

The pressure-sensitive adhesive layer contains a rosin tackifier resin having a crosslinkable functional group or a terpene tackifier resin having a crosslinkable functional group.
When both the living radical polymerization acrylic polymer and the tackifying resin have a hydroxyl group, by using, for example, an isocyanate-based crosslinking agent as a crosslinking agent, both the living radical polymerization acrylic polymer and the tackifying resin are interposed via the crosslinking agent. It reacts and crosslinks. When both the living radical polymerization acrylic polymer and the tackifying resin have a carboxyl group, the living radical polymerization acrylic polymer and the tackifying resin can be obtained by using, for example, an epoxy crosslinking agent or an aziridine crosslinking agent as a crosslinking agent. Both of them react and crosslink via a crosslinking agent. Living radical polymerization acrylic polymer has uniform composition of almost all polymers and has crosslinkable functional groups, so almost all polymers can crosslink between polymer chains and between polymer chains and tackifying resins. Can be involved. For this reason, even if it is a thin double-sided adhesive tape, high heat-resistant adhesiveness can be exhibited.
Since the gel fraction and the adhesive performance can be easily controlled, a combination in which both the living radical polymerization acrylic polymer and the tackifier resin have a hydroxyl group and an isocyanate crosslinking agent is used as a crosslinking agent is particularly suitable.

The lower limit of the hydroxyl value of the rosin-based tackifier resin or terpene-based tackifier resin is 25. When the hydroxyl value is 25 or more, particularly high heat-resistant adhesiveness can be exhibited. A more preferred lower limit of the hydroxyl value is 30.
The hydroxyl value can be measured by JIS K1557 (phthalic anhydride method).

The rosin-based tackifier resin or terpene-based tackifier resin has a preferred softening temperature lower limit of 70 ° C. and a preferred upper limit of 170 ° C. When the softening temperature is within this range, particularly excellent heat-resistant adhesiveness can be exhibited. A more preferable lower limit of the softening temperature is 120 ° C.
The softening temperature is a softening temperature measured by the JIS K2207 ring and ball method.

The rosin tackifier resin or terpene tackifier resin is not particularly limited, and examples thereof include rosin ester resins and terpene phenol resins, and rosin ester resins are preferable.
The above-mentioned rosin ester resins are rosin resins mainly composed of abietic acid, disproportionated rosin resins and hydrogenated rosin resins, dimers of polymer acids such as abietic acid (polymerized rosin resins), etc. It is the resin obtained by making it. A part of the hydroxyl group of the alcohol used for esterification is contained in the resin without being used for esterification, so that the hydroxyl value is adjusted to the above range. Examples of the alcohol include polyhydric alcohols such as ethylene glycol, glycerin, and pentaerythritol.
Resin esterified rosin resin is rosin ester resin, disproportionated rosin resin esterified disproportionated rosin ester resin, hydrogenated rosin resin esterified resin is hydrogenated rosin ester resin, polymerized rosin A resin obtained by esterifying the resin is a polymerized rosin ester resin.
The terpene phenol resin is a resin obtained by polymerizing terpene in the presence of phenol.

Examples of the disproportionated rosin ester resin include Superester A75 (hydroxyl value 23, softening temperature 75 ° C.) manufactured by Arakawa Chemical Industries, Superester A100 (hydroxyl value 16, softening temperature 100 ° C.) manufactured by Arakawa Chemical Co., Ltd. Examples thereof include ester A115 (hydroxyl value 19, softening temperature 115 ° C.), super ester A125 (hydroxyl value 15, softening temperature 125 ° C.) manufactured by the same company. Examples of the hydrogenated rosin ester resin include Pine Crystal KE-359 (hydroxyl value 42, acid value 12, softening temperature 100 ° C.) manufactured by Arakawa Chemical Industries, and ester gum H (hydroxyl value 29, softening temperature 70 ° C.) manufactured by the same company. ) And the like. Examples of the polymerized rosin ester resin include Pencel D135 (hydroxyl value 45, acid value 13, softening temperature 135 ° C.) manufactured by Arakawa Chemical Industries, Ltd. Pencel D125 (hydroxyl value 34, acid value 13, softening temperature 125 ° C.) And Pencel D160 (hydroxyl value 42, acid value 13, softening temperature 160 ° C.) manufactured by the same company.
Examples of the terpene-based tackifier resin include YS Polystar G150 (softening point 150 ° C.) manufactured by Yasuhara Chemical, YS Polystar T100 (softening point 100 ° C.) manufactured by Yasuhara Chemical, YS Polystar G125 (softening point 125 ° C.) manufactured by the company YS Polystar T115 (softening point 115 ° C), YS Polystar T130 (softening point 130 ° C), Polystar U115 (softening point 115 ° C), Polystar UH115 (softening point 115 ° C), YS Resin PX1250 (manual) Softening point 125 ° C.).
These rosin-based tackifier resins or terpene-based tackifier resins may be used alone or in combination of two or more.

The content of the rosin-based tackifier resin or the terpene-based tackifier resin is preferably 20 parts by weight with respect to 100 parts by weight of the living radical polymerization acrylic polymer, and 50 parts by weight with respect to the preferred upper limit. When the content of the tackifying resin is within this range, the shear deformation rate can be easily adjusted to the above range, and excellent adhesiveness and heat-resistant adhesiveness can be exhibited. The minimum with more preferable content of the said tackifying resin is 25 weight part, and a more preferable upper limit is 45 weight part.

The pressure-sensitive adhesive layer contains a crosslinking agent.
The said crosslinking agent is not specifically limited, According to the combination of the said living radical polymerization acrylic polymer, a rosin type tackifying resin, or a terpene type tackifying resin, the crosslinking agent which can bridge | crosslink these is selected suitably.
Examples of the crosslinking agent include isocyanate crosslinking agents, aziridine crosslinking agents, epoxy crosslinking agents, metal chelate crosslinking agents, and the like. Especially, since it is excellent in the adhesive stability with respect to a base material, an isocyanate type crosslinking agent is preferable.
Examples of the isocyanate-based crosslinking agent include Coronate HX (manufactured by Nippon Polyurethane Industry Co., Ltd.), Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.), and Mytec NY260A (manufactured by Mitsubishi Chemical Corporation).

The content of the crosslinking agent is preferably 0.01 parts by weight and preferably 5 parts by weight with respect to 100 parts by weight of the living radical polymerization acrylic polymer.
The gel fraction of the pressure-sensitive adhesive layer can be adjusted by appropriately adjusting the type or amount of the crosslinking agent.

The pressure-sensitive adhesive layer may contain other resins such as additives such as a plasticizer, an emulsifier, a softener, a filler, a pigment, a dye, a silane coupling agent, and an antioxidant, if necessary. Good.

The pressure-sensitive adhesive layer preferably has a gel fraction of 50% by weight or less. When the gel fraction exceeds 50% by weight, the cross-linking density of the pressure-sensitive adhesive layer becomes too high, and the double-sided pressure-sensitive adhesive tape tends to peel off, and the heat-resistant adhesiveness may be lowered.
The lower limit of the gel fraction of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 1% by weight or more, more preferably 5% by weight or more, and more preferably 20% by weight or more from the viewpoint of heat resistance and the like. More preferably.
The gel fraction is measured as follows. First, a double-sided pressure-sensitive adhesive tape was cut into a flat rectangular shape of 50 mm × 100 mm to prepare a test piece. The test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, then taken out from ethyl acetate, and the condition of 110 ° C. Dry under 1 hour. The weight of the test piece after drying is measured, and the gel fraction is calculated using the following formula. In addition, the release film for protecting an adhesive layer shall not be laminated | stacked on the test piece.
Gel fraction (% by weight) = 100 × (W2-W0) / (W1-W0)
(W0: weight of substrate, W1: weight of test piece before immersion, W2: weight of test piece after immersion and drying)

Even if the double-sided pressure-sensitive adhesive tape of the present invention is a thin double-sided pressure-sensitive adhesive tape, it is difficult for the double-sided pressure-sensitive adhesive tape to peel off.
The thickness of the pressure-sensitive adhesive layer is not particularly limited because it is set depending on the application, but a preferred lower limit is 1 μm and a preferred upper limit is 100 μm. When the thickness is less than 1 μm, the double-sided pressure-sensitive adhesive tape is easily peeled off, and the constant load peelability to a low-polar adherend such as a polypropylene (PP) plate may be lowered. When the said thickness exceeds 100 micrometers, a thin double-sided adhesive tape may not be obtained. The more preferable lower limit of the thickness is 5 μm, and the more preferable upper limit is 75 μm.

The double-sided pressure-sensitive adhesive tape of the present invention may be a support type having a base material or a non-support type having no base material. In the case of the support type, the pressure-sensitive adhesive layer may be formed on one side of the base material, or the pressure-sensitive adhesive layer may be formed on both sides, but both sides can exhibit higher heat resistant adhesiveness. It is preferable that the above-mentioned pressure-sensitive adhesive layer is formed.

Although the said base material is not specifically limited, A resin film, a resin foam, paper, a nonwoven fabric, a yarn cloth cloth etc. are mentioned.
Examples of the resin film include polyolefin resin films such as polyethylene films and polypropylene films, polyester resin films such as PET films, and modified olefins such as ethylene-vinyl acetate copolymers and ethylene-acrylic ester copolymers. Examples thereof include a resin film, a polyvinyl chloride resin film, a polyurethane resin film, and a cycloolefin polymer resin film.
Examples of the resin foam include polyethylene foam, polypropylene foam, acrylic foam, urethane foam, and ethylene propylene rubber foam.
Examples of the yarn cloth cloth include a woven polyethylene flat yarn and a laminate of a resin film on the surface thereof.
Especially in the case of double-sided tapes used in the assembly of display modules, black-printed substrates to prevent light transmission, white-printed substrates to improve light reflectivity, metal-deposited film substrates, etc. Can also be used.

The thickness of the substrate is not particularly limited because it is set depending on the use, but for example, in the case of a film substrate, it is preferably 1 to 100 μm, more preferably 5 to 75 μm. When the thickness of the base material is less than 1 μm, the mechanical strength of the double-sided pressure-sensitive adhesive tape may be lowered. When the thickness of the base material exceeds 100 μm, the double-sided pressure-sensitive adhesive tape becomes too strong, and it may be difficult to adhere and adhere together along the shape of the adherend.

The thickness of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited because it is set depending on the application. For example, in the case of a support type having the above-mentioned base material, 3 to 300 μm is preferable, 15 to 225 μm is more preferable, Particularly preferred. Since the double-sided pressure-sensitive adhesive tape of the present invention can exhibit high heat-resistant adhesiveness even when it is very thin of about 15 to 30 μm, the thickness of the double-sided pressure-sensitive adhesive tape is reduced and the thickness of the laminated body bonded with the members is increased. Can be suppressed.

The method for producing the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited. For example, the living radical polymerization acrylic polymer and the rosin-based tackifier resin or the terpene-based tackifier resin may be used as necessary, for example, the crosslinking agent. Mix with other ingredients and stir to prepare a pressure-sensitive adhesive solution. Subsequently, the pressure-sensitive adhesive solution is coated and dried on a release-treated PET film to form a pressure-sensitive adhesive layer. Examples thereof include a method of transferring the layer to one or both sides of the substrate, a method of directly coating and drying the substrate, and the like. A pressure-sensitive adhesive layer formed by coating and drying a PET film obtained by releasing the pressure-sensitive adhesive solution may be used as a non-support type double-sided pressure-sensitive adhesive tape without a substrate.

Although the use of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited, it can be particularly suitably used for fixing electronic device parts and in-vehicle parts. Specifically, the double-sided pressure-sensitive adhesive tape of the present invention can be used for adhesion / fixation of electronic device parts, adhesion / fixation of in-vehicle components (for example, in-vehicle panels) in large-sized portable electronic devices.
The double-sided pressure-sensitive adhesive tape for fixing electronic device parts comprising the double-sided pressure-sensitive adhesive tape of the present invention is also one aspect of the present invention. The in-vehicle component fixing double-sided pressure-sensitive adhesive tape comprising the double-sided pressure-sensitive adhesive tape of the present invention is also one aspect of the present invention.
The shape of the double-sided pressure-sensitive adhesive tape for fixing electronic device parts and the double-sided pressure-sensitive adhesive tape for fixing vehicle-mounted parts of the present invention is not particularly limited, and examples thereof include a rectangular shape, a frame shape, a circular shape, an elliptical shape, and a donut shape.
Since the double-sided pressure-sensitive adhesive tape of the present invention has a high heat-resistant adhesive property, it can be particularly preferably used for fixing electronic device parts and in-vehicle parts even if the line width is 1 mm or less.

ADVANTAGE OF THE INVENTION According to this invention, the double-sided adhesive tape which can exhibit the high heat-resistant adhesiveness which is hard to peel even if stress is applied under the high temperature of 80 degreeC or more can be provided.

It is a schematic diagram which shows the outline of the apparatus used for the measurement of a shear deformation rate. It is a schematic diagram explaining living radical polymerization. It is a schematic diagram explaining the case where the acrylic polymer obtained by living radical polymerization is bridge | crosslinked. It is a schematic diagram explaining free radical polymerization. It is a schematic diagram explaining the case where the acrylic polymer obtained by free radical polymerization is bridge | crosslinked. It is a schematic diagram explaining the heating PUSH test of the double-sided adhesive tape in an Example.

Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

<Synthesis of acrylic polymer>
(Synthesis 1)
(Synthesis 1-1)
Tellurium (40 mesh, metal tellurium, Aldrich) 6.38 g (50 mmol) was suspended in tetrahydrofuran (THF) 50 mL, and 1.6 mol / L n-butyllithium / hexane solution (Aldrich) 34 4 mL (55 mmol) was slowly added dropwise at room temperature. The reaction solution was stirred until the metal tellurium disappeared completely. To this reaction solution, 10.7 g (55 mmol) of ethyl-2-bromo-isobutyrate was added at room temperature and stirred for 2 hours. After completion of the reaction, the solvent was concentrated under reduced pressure, followed by distillation under reduced pressure to obtain a yellow oily ethyl 2-methyl-2-n-butylteranyl-propionate.

(Synthesis 1-2)
In a glove box substituted with argon, in a reaction vessel, 19 μL of ethyl 2-methyl-2-n-butylterranyl-propionate prepared in Synthesis Example 1-1, V-60 (2,2′-azobisisobutyro After adding 34 mg of nitrile (manufactured by Wako Pure Chemical Industries, Ltd.) and 1 mL of ethyl acetate, the reaction vessel was sealed and the reaction vessel was taken out of the glove box. Subsequently, while flowing argon gas into the reaction vessel, a total of 100 g of the mixed monomers shown in Table 1 and 66.5 g of ethyl acetate as a polymerization solvent were charged into the reaction vessel, and a polymerization reaction was performed at 60 ° C. for 20 hours. A living radical polymerized acrylic polymer-containing solution was obtained.
The obtained acrylic polymer-containing solution was diluted 50-fold with tetrahydrofuran (THF), and the resulting diluted solution was filtered with a filter (material: polytetrafluoroethylene, pore diameter: 0.2 μm). Supplied to a gel permeation chromatograph (manufactured by Waters, 2690 Separations Model), GPC measurement was performed under the conditions of a sample flow rate of 1 mL / min and a column temperature of 40 ° C., and the polystyrene equivalent molecular weight of the polymer was measured. (Mw) and molecular weight distribution (Mw / Mn) were determined. GPC KF-806L (manufactured by Showa Denko) was used as the column, and a differential refractometer was used as the detector.

(Synthesis 2)
Charge amount of ethyl 2-methyl-2-n-butylterranyl-propionate, charge amount of V-60 (2,2′-azobisisobutyronitrile, manufactured by Wako Pure Chemical Industries, Ltd.), and composition of mixed monomer Except for the above, Table 1 was used to obtain a living radical polymerized acrylic polymer-containing solution in the same manner as in Synthesis 1, and the weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn) were determined.

(Synthesis 3)
50 g of ethyl acetate was added as a polymerization solvent in the reaction vessel, and after bubbling with nitrogen, the reaction vessel was heated while flowing nitrogen and refluxing was started. Subsequently, a polymerization initiator solution in which 0.1 g of V-60 (2,2′-azobisisobutyronitrile, manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator was diluted 10-fold with ethyl acetate was again put in the reaction vessel. Then, a polymerization reaction was performed for 6 hours to obtain a free radical polymerization acrylic polymer-containing solution.
In the same manner as in Synthesis 1, the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) were determined.

(Examples 1 to 7, Comparative Examples 1 to 7)
Ethyl acetate is added to the acrylic polymer-containing solution obtained above with respect to 100 parts by weight of the non-volatile content and stirred, and a tackifying resin and a crosslinking agent are added in the types and amounts shown in Table 2. To obtain a pressure-sensitive adhesive solution having a nonvolatile content of 30% by weight. The obtained pressure-sensitive adhesive solution was applied to a PET film having a thickness of 50 μm which had been subjected to a release treatment so that the paste thickness would be 10 μm after drying, and then dried at 100 ° C. for 10 minutes to obtain a pressure-sensitive adhesive layer. The obtained pressure-sensitive adhesive layer was transferred onto one surface of a 10 μm-thick polyethylene terephthalate (PET) film having corona treatment on both surfaces serving as a base material. A pressure-sensitive adhesive layer having a thickness of 10 μm was transferred onto the other surface of the PET film serving as a base material by the same method to obtain a double-sided pressure-sensitive adhesive tape having a thickness of 30 μm.
However, in Example 7, a 7 μm thick adhesive layer was transferred onto both sides of a 6 μm thick PET film to obtain a 20 μm thick double-sided adhesive tape.
The tackifying resin and the crosslinking agent used are as follows.

<Tackifying resin>
Rosin-based tackifier resin A: Polymerized rosin ester resin, hydroxyl value 46, softening point 160 ° C.
Rosin-based tackifying resin B: hydrogenated rosin ester resin, hydroxyl value 42, softening point 100 ° C.
Terpene-based tackifier resin C: terpene phenol resin, softening point 150 ° C.
Terpene-based tackifier resin D: terpene phenol resin, softening point 125 ° C
<Crosslinking agent>
Coronate L: manufactured by Nippon Polyurethane Co., Ltd., isocyanate-based crosslinking agent

About the obtained double-sided adhesive tape, the displacement displacement recovery rate was measured as follows using the apparatus (Asahi Seiko Co., Ltd. shear shear measuring device, NST1) used for the measurement of the shear deformation rate shown in FIG. .
First, the release film on one side of the obtained double-sided pressure-sensitive adhesive tape is peeled off and a polyethylene terephthalate (PET) film subjected to corona treatment is attached to the exposed pressure-sensitive adhesive layer, and then cut into a width of 1 cm and a length of 12 cm. Test piece 5 was obtained. The temperature controller 4 of the apparatus was set to 80 ° C. and left to stabilize at the set temperature. (The following temperature controllers were used in combination: Takagi Manufacturing Co., Ltd. Temperature Controller SA100, Model SA100FK08-MN-4 * NN-NN; Takagi Manufacturing Co., Ltd. Copper Water-cooled Peltier Unit, Model PU-50W; EYELA Cooling Water circulator Cool Ace, model CCA1111) The other release film of the test piece 5 is peeled off about 3 cm from the end and removed, and the exposed adhesive layer is attached to the adherend 3 so that the adhesion area becomes 1 cm × 1 cm. I attached. A quartz block 2 (having chrome deposited on quartz glass) whose end face is mirror-finished is placed on the affixing surface, and the test piece 5 is attached to a wire that connects to a 200 g weight 6. The mixture was left in this state for 5 minutes. After 5 minutes, the PC connected to the apparatus was operated to start applying a load, and a shear load in the waterside direction was applied to the test piece 5 for 3 minutes. Here, the displacement amount accompanying the deformation of the adhesive is detected as the movement amount of the mirror-treated quartz block 2 on the test piece 5 by the laser interferometer 1 (SI-F10 manufactured by Keyence), and “shear deformation” is calculated based on the above formula. "Rate" was calculated.

Moreover, the obtained double-sided adhesive tape was cut into a flat rectangular shape of 50 mm × 100 mm to prepare a test piece, and the release film was peeled off. The test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, then taken out from the ethyl acetate and dried at 110 ° C. for 1 hour. The weight of the test piece after drying was measured, and the gel fraction was calculated using the above formula.

(Evaluation)
The following evaluation was performed about the double-sided adhesive tape obtained by the Example and the comparative example. The results are shown in Table 2.

(Heating PUSH test)
In FIG. 6, the schematic diagram explaining the heating PUSH test of a double-sided adhesive tape is shown. The obtained double-sided adhesive tape was punched into an outer diameter of 61 mm, a length of 61 mm, an inner diameter of 59 mm, and a length of 59 mm to produce a frame-shaped test piece 20 having a width of 1 mm. Next, as shown in FIG. 6 (a), the square hole is approximately at the center of the test piece 20 from which the release paper has been peeled off from the polycarbonate plate 22 having a thickness of 50 mm and a square hole having a length of 50 mm and a thickness of 2 mm. Then, a polycarbonate plate 21 having a width of 65 mm, a length of 65 mm, and a thickness of 1 mm was pasted from the upper surface of the test piece 1 so that the test piece 20 was positioned substantially at the center, and the test apparatus was assembled.
Thereafter, a 200 g roller was reciprocated once from the polycarbonate plate side positioned on the upper surface of the test apparatus, and the polycarbonate plate positioned on the top and bottom were pressed against each other and the test piece was allowed to stand at 23 ° C. for 15 hours.

As shown in FIG. 6B, the prepared test apparatus was turned upside down and fixed on a support base, and then placed in a temperature controller adjusted to 80 ° C. and left to be stable. A load 23 was slowly applied through the square hole at a speed of 10 mm / min. Before the load 23 reaches 4N, “X” indicates that the test piece and the polycarbonate plate were peeled off due to the load, “△” indicates that the load exceeded 4N and reached 5N, and the load exceeded 5N. Those that did not peel off were evaluated as “◯”.

ADVANTAGE OF THE INVENTION According to this invention, the double-sided adhesive tape which can exhibit the high heat-resistant adhesiveness which is hard to peel even if stress is applied under the high temperature of 80 degreeC or more can be provided.

DESCRIPTION OF SYMBOLS 1 Laser interferometer 2 Mirror surface processing quartz block 3 To-be-adhered body (JISZ0237 normal stainless steel)
4 Temperature controller 5 Test piece (Double-sided adhesive tape)
6 Weight 7 Adhesive layer 8 Remaining release film surface 9 Corona-treated PET film surface 10 Mirror surface 11 Acrylic polymer obtained by living radical polymerization 111 Monomer not containing a crosslinkable functional group 112 Crosslinkable functional group-containing monomer 12 Acrylic polymer 121 obtained by free radical polymerization 121 Monomer 122 not containing a crosslinkable functional group 122 Crosslinkable functional group-containing monomer 123 Polymer whose growth end radical was deactivated during the reaction 124 Growth caused by radical species newly generated during the reaction Polymer 20 Double-sided adhesive tape test piece (frame shape)
21 Polycarbonate plate 22 Polycarbonate plate 23 Load

Claims (4)

1. A polymer component containing an acrylic polymer having a crosslinkable functional group having a weight average molecular weight of 500,000 to 1,500,000 and a molecular weight distribution (Mw / Mn) of 1.05 to 2.5 obtained by living radical polymerization; It has a pressure-sensitive adhesive layer containing a rosin-based tackifying resin having a functional group, or a terpene-based tackifying resin having a crosslinkable functional group, and a crosslinking agent,
   A double-sided pressure-sensitive adhesive tape characterized by having a shear deformation ratio of 100 to 300% when a shear load of 200 g is applied at 80 ° C. for 3 minutes to a double-sided pressure-sensitive adhesive tape affixed with an adhesion area of 1 cm ² .
2. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive layer has a gel fraction of 50% by weight or less.
3. A double-sided pressure-sensitive adhesive tape for fixing electronic device parts, comprising the double-sided pressure-sensitive adhesive tape according to claim 1.
4. A double-sided pressure-sensitive adhesive tape for fixing on-vehicle components, comprising the double-sided pressure-sensitive adhesive tape according to claim 1.

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