JP3398487B2 - Acrylic adhesive composition - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an adhesive force by heating.
The present invention relates to an acrylic pressure-sensitive adhesive composition which can be used. 2. Description of the Related Art Recently, masking when painting automobiles.
Used for applications and can be removed again by heat treatment after use
Unnecessary after use, like adhesive tape for masking
Adhesive tape that can be removed again by heat treatment
The demand for is increasing. In response to such demands, for example, electronic components
Used for temporary fixing during the assembly process of
Re-peelable by heat treatment after use by containing fat
That can be used for temporary fixing adhesive tape
(JP-A-56-61468)
Information). [0004] However, the above viscosity
Flammable when the thermal expansion resin contained in the adhesive is heated
Generates gas, which may cause fire hazard due to ignition and low working environment.
It was not desirable because of the following problems. An object of the present invention is to use an adhesive tape.
High adhesive strength at room temperature, easy to remove by heating
Acrylic that is safe and has no environmental problems
An object of the present invention is to provide a pressure-sensitive adhesive composition. [0006] The adhesive used in the present invention.
The agent consists of carboxyl, hydroxyl and amino groups
A having at least one or more functional groups selected from the group
It is made of a cryl copolymer. [0007] The acrylic copolymer is a carboxyl
Group-containing monomer, hydroxyl group-containing monomer and amino group-containing monomer
At least one or more selected from the group consisting of monomers having a monomer
Vinyl monomer copolymerizable with the functional group-containing monomer
It is obtained by copolymerizing a nomer. As the carboxyl group-containing monomer,
Means (meth) acrylic acid, maleic acid, fumaric acid,
In addition to conic acid, carboxyethyl (meth) acrylate,
Carboxy such as carboxypropyl (meth) acrylate
And a silalkyl (meth) acrylate.
Can be used alone or in combination of two or more.
come. The above-mentioned hydroxyl group-containing monomer includes 2-hydroxy
Droxyethyl (meth) acrylate, 2-hydroxy
Propyl (meth) acrylate, 4-hydroxybutyl
Hydroxyalkyl (meth) such as (meth) acrylate
Acrylate and the like, and these may be used alone or in combination of two types.
These can be used in combination. The above-mentioned amino group-containing monomer includes an amino group
(Meth) acrylate and the like.
Alternatively, two or more kinds can be used in combination. As the vinyl monomer, for example,
Chill (meth) acrylate, ethyl (meth) acrylate
G, n-propyl (meth) acrylate, isopropyl
(Meth) acrylate, n-butyl (meth) acrylate
G, isobutyl (meth) acrylate, n-octyl
(Meth) acrylate, 2-ethylhexyl (meth) a
Acrylate, isooctyl (meth) acrylate, n-
Nonyl (meth) acrylate, isononyl (meth) ac
Relate, lauryl (meth) acrylate, stearyl
Alkyl (meth) acrylates such as (meth) acrylate
G, vinyl acetate, vinyl pyrrolidone, vinyl caprolact
Toms, etc., which may be used alone or in combination of two or more.
It can be used in combination. In the above acrylic copolymer,
When the content of the functional group-containing monomer decreases,
In order to obtain the necessary degree of crosslinking as an adhesive in advance,
If a functional group is used, the remaining functional group is too small to be removed again.
It is difficult to obtain a sufficiently high degree of cross-linking as the releasability improves
More, the cohesive strength increases, sufficient pressure-sensitive adhesion
1 to 50 weight
%, More preferably 5 to 40% by weight. The method for obtaining the above acrylic copolymer is as follows.
And a solution polymerization method and a photo polymerization method.
Is the thermal polymerization initiator, and the photopolymerization method is the photopolymerization initiator.
Used respectively. Examples of the thermal polymerization initiator include, for example, benzene
Zoyl peroxide, 2,2'-azobis-isobutyi
Lonitrile and the like, and as the above photopolymerization initiator.
For example, 4- (2-hydroxyethoxy) phenyl
(2-hydroxy-2-propyl) ketone
Gy Co., trade name "Darocur 2959"], 2-H
Droxy-2,2-dimethylacetophenone
Product name "Darocur 1173"]
Tophenone, benzoin ethyl ether, benzoin
Benzoin ethers such as propyl ether, benzyl
Ketals such as dimethyl ether ketal
You. Addition of the above-mentioned thermal polymerization initiator and photopolymerization initiator
If the amount is too small, the polymerization will not be completed and the monomer odor will be strong.
Polymer and the more radicals, the more radicals are generated
And it is difficult to obtain sufficient cohesion due to molecular weight reduction
Therefore, the total amount of the monomer composition is 100 parts by weight.
And preferably 0.01 to 5 parts by weight, more preferably
Or 0.05 to 3 parts by weight. The above-mentioned pressure-sensitive adhesive has a cohesive force required as a pressure-sensitive adhesive.
May be crosslinked for the purpose of obtaining
Is, for example, toluylene diisocyanate (TDI),
Naphthylene-1,5-diisocyanate, diphenylmeth
Tandi isocyanate (MDI), hexamethylene dii
Socyanate (HMDI), isophorone diisocyanate
(IPDI), xylene diisocyanate (XD
I), isocyanates such as trimethylolpropane modified TDI
Nate-based crosslinking agent, ethylene glycol diglycidyl ester
Ter, propylene glycol diglycidyl ether,
D, such as 1,6-hexanediol diglycidyl ether;
Poxy-based crosslinking agent, N, N'-hexamethylene-1,6-
Bis (1-aziridinecarboxamide), N, N'-
Diphenylmethane-4,4'-bis (1-aziridine
Ruboxamide), trimethylolpropane-tri-β
-Aziridine-based crosslinks such as aziridinylpropionate
Agent, melamine-based crosslinking agent, metal chelate-based crosslinking agent, benzo
Peroxides such as ilperoxide; If the amount of the above-mentioned cross-linking agent is small, the
Does not provide sufficient cohesive strength as an agent
Not only pressure-sensitive adhesiveness is not obtained, but also the degree of crosslinking before heating
Because of the high degree of crosslinking, the degree of crosslinking does not increase sufficiently after heating.
Since it is difficult to obtain releasability, the acrylic copolymer 10
0.02 to 3 parts by weight, preferably 0 to 3 parts by weight,
Preferably, 0.04 to 1 part by weight is good. When photopolymerization is carried out, the above photopolymerization start
Polyfunctional (meth) a
By adding acrylate in advance, polymerization and cross-linking are
Sometimes it can be done. As the above polyfunctional (meth) acrylate
Is, for example, 1.4-butanediol di (meth) acryl
Rate, 1.6-hexanediol di (meth) acryle
1.9-nonanediol di (meth) acrylate
G, (poly) ethylene glycol di (meth) aclay
G, (poly) propylene glycol di (meth) acryle
, Neopentyl glycol di (meth) aclay
Pentaerythritol di (meth) acrylate,
Lyserine methacrylate acrylate, pentaerythri
Tall tri (meth) acrylate, trimethylol pro
Pantri (meth) acrylate, (meth) acrylic acid
Ril, vinyl (meth) acrylate, divinylbenzene, etc.
Is mentioned. Other epoxy (meth) aclay
G, polyester (meth) acrylate, urethane (meth
(T) acrylate and the like. The above polyfunctional (meta)
Acrylates may be used alone or in combination of two or more.
No. The above-mentioned pressure-sensitive adhesive may have other physical properties if necessary.
Within the range that does not impair the viscosity, tackifier resin, viscosity modifier, filling
Agents, antioxidants, ultraviolet absorbers and the like may be added. Examples of the tackifying resin include C5
-Based and C9-based (hydrogenated) petroleum resins, (hydrogenated) rosin resins,
(Hydrogenated) rosin ester resin, (hydrogenated) terpene resin,
(Hydrogenated) terpene phenolic resin, (hydrogenated) coumarone
Indene resin, disproportionated rosin resin, disproportionated rosin ester
Resin, polymerized rosin resin, polymerized rosin ester resin, etc.
No. The above tackifier resin is used alone or in combination of two or more
You may use together. When the amount of the tackifying resin is reduced, it is sufficient.
It is difficult to obtain adhesive physical properties.
Uncrosslinked component in the acrylic pressure-sensitive adhesive composition
And it is difficult to obtain a sufficient cohesive force.
10 to 70 parts by weight based on 100 parts by weight of the ril copolymer
preferable. The above-mentioned viscosity modifier is used for coating thickness at the time of photopolymerization.
Added for the purpose of controlling, for example, acrylic rubber,
Nitrile rubber, epichlorohydrin rubber, isoprengo
Rubber, butyl rubber, styrene-isoprene-styrene (S
IS), etc., polymethyl methacrylate,
Thermoplastic resins such as polystyrene, Aerosil and the like
You. The acrylic pressure-sensitive adhesive composition of the present invention is
Capsule-type cross-linking agent for adhesive made of acrylic copolymer
Is obtained by dispersing The above-mentioned capsule type cross-linking agent may be used in a usual manner.
Temperature, the cross-linking reaction between the pressure-sensitive adhesive and the polyfunctional compound
Surface of the polyfunctional compound to prevent
Is coated with wax. As the above polyfunctional compound, 2
Having two or more epoxy groups and two or more
Those having a cyanate group are exemplified. The above polyfunctional having two or more epoxy groups
As an active compound, kept in a solid state at room temperature
In particular, the melting point is 40 to 180 ° C, and the epoxy equivalent is
Those having 120 to 800 g / eq are preferable.
Sphenol A epoxy resin, hydrogenated bisphenol A
Epoxy resin, bisphenol F epoxy resin [Example
For example, "Epototo YDF-2004" (trade name, Totoka
Epi-bis type epoxy resin, o-creso
Novola such as lunovolak and phenol novolak
Epoxy resin, brominated epoxy resin, glycidyl
Amine type epoxy resin such as amine, cycloaliphatic epoxy
Xy resin, long-chain aliphatic epoxy resin, glycidyl S
Ter epoxy resin, aliphatic polyglycidyl ether
Epoxy resin, TBA type epoxy resin [e.g.
Coat 5051 "(trade name, Yuka Shell Epoxy Co., Ltd.)
Manufactured)), biphenyl type epoxy resin [for example, “YX-4”
000 "(trade name, Yuka Shell Epoxy Co., Ltd.)]
Subhydroxyphenylmethane type epoxy resin [for example,
"E1032H60" (trade name, Yuka Shell Epoxy)
)], An alkyl-substituted trifunctional epoxy resin [for example,
"ESX-220" (trade name, manufactured by Sumitomo Chemical Co., Ltd.)]
Functional epoxy resin [for example, "VG3101" (trade name,
Mitsui Petrochemical Co., Ltd.)], tetraphenolethane-type epoxy
Xy resin [“E1031S” (trade name, Yuka Shell Epo)
Kishi Co.)], dicyclopentadiene phenol type epo
Xylene resin [eg "DEC400" (trade name, Sanyo Kokusaku)
Pulp Co., Ltd.)]. Having the above two or more isocyanate groups
Examples of the polyfunctional compound include, for example, 2,4-tolylenediene
Isocyanate, 2,6-tolylene diisocyanate,
Diphenylmethylmethane diisocyanate, polymethylene
Polyphenyl polyisocyanate, tolidine diisocyanate
Aromatic resins such as anate and naphthalene diisocyanate
Polyisocyanate, 1,6-hexamethylene diisocyanate
, Isophorone diisocyanate, xylylene diisocyanate
Socyanate, hydrogenated xylylene diisocyanate, disilicone
Aliphatic poly such as chlorhexyl methane diisocyanate
In addition to isocyanates, these are used for ε-caprolactam,
Phenols such as enol, alcohols such as methanol
Oximes such as methyl ethyl ketone oxime
With blocking agents such as active methylene compounds such as ethyl toacetate
And the like. The average particle size of the polyfunctional compound is small.
When this occurs, secondary aggregation tends to occur.
When used for adhesive tape, it is close to the thickness of normal adhesive tape.
0.1 to 50 μm
Is limited, preferably from 0.2 to 20 μm, furthermore
Preferably it is 0.5 to 10 μm. The above polyfunctional compound is pulverized to the above particle size.
For example, ball mills used for grinding
, Counter jet mill, current jet mill,
Contraplex mill and the like. The above wax is hardly dissolved in the adhesive,
Those which melt quickly by heating at 40 to 180 ° C are preferred.
More preferably, for example, an amide compound having 12 to 44 carbon atoms, charcoal
Bisamide compound having a prime number of 12 to 44, carbon number of 12 to 44
N-substituted urea compounds, carboxylic acids having 10 to 30 carbon atoms and
And its salts, alcohols having 16 to 72 carbon atoms, 2 carbon atoms
0 to 60 ester compound, having 20 to 70000 carbon atoms
Examples include polyolefins and ketones having 20 to 60 carbon atoms.
It is. As the amide compound, for example, lau
Phosphoric acid amide, palmitic acid amide, stearic acid amide
, Behenic acid amide, hydroxystearic acid amide,
Erucamide, ricinoleamide, N-stearyl
Stearic acid amide, N-oleyl oleic acid amide,
N-stearyl oleamide, N-stearyl L
Amide, N-oleyl palmitamide, methylo
Oleostearamide, methylolbehenamide, etc.
Is mentioned. As the above bisamide compound, for example,
Methylene bisstearic acid amide, ethylene bisstea
Phosphate amide, hexamethylene bisstearic acid ami
, Hexamethylenebisbehenamide, N, N-dis
Tearyl adipamide, N, N-distearyl seba
Succinamide, N, N-methylenebisoctadecanoic acid
Amide, ethylene bisoleic acid amide, hexamethylene
Bisoleic acid amide, N, N-dioleyl adipic acid
Amide, N, N-dioleyl sebacamide, m-ki
Silylene bisstearic acid amide, N, N-disteary
Lysophthalic acid amide; As the N-substituted urea compound, for example,
N-butyl-N'-stearyl urea, N-phenyl-
N'-stearyl urea, N-stearyl-N'-steer
Lil urea and the like. As the carboxylic acid, for example, capri
Acid, lauric acid, myristic acid, palmitic acid,
Aric acid, behenic acid, oleic acid, erucic acid, lisino
And luic acid. Examples of the above carboxylic acid salts include, for example,
Barium thearate, calcium stearate, steer
Zinc phosphate, aluminum stearate, stearic acid
Magnesium and the like. As the alcohol, for example, cetyl
Alcohol, stearyl alcohol, oleyl alcohol
, Behenyl alcohol, mannitol and the like.
You. As the above ester compound, for example,
Myristyl listate, stearyl stearate,
Octyldodecyl acid, behenyl behenate, diphthalic acid
Stearyl, dicyclohexyl phthalate, sorbitanmo
Nopalmitate, sorbitan monostearate, sorbitan
Tandistearate, sorbitan tristearate,
Rubitan sesquioleate, sorbitan monobehene
G, polyethylene glycol monolaurate, (poly)
Ethylene glycol distearate, propylene glyco
Monostearate, pentaerythritol monostea
Allate, stearic acid monoglyceride, palmitin
Acid monoglyceride, oleic acid monoglyceride,
Henic acid monoglyceride, oleic acid stearic acid di
Glyceride, diglyceride stearate, methacrylate
Stearyl luate, behenyl methacrylate, hydrogenated castor oil
And the like. As the above-mentioned polyolefin, for example,
Ethylene, polypropylene, ethylene-propylene
Polymers, or carboxyl groups, glycidyl
And the like. As the above ketone, distearyl keto
, Dicapryl ketone, dilauryl ketone, dimyristic
Luketone, dipalmityl ketone, dioleyl ketone, diketone
Behenyl ketone and the like. The above wax is coated on the above polyfunctional compound.
As a method to do this, CF-granulation coating equipment or SPI
Using a RA-FLOW apparatus, the particles of the polyfunctional compound
The method of coating the wax liquid on the child, "Dispaco
Multi-stages (such as product name, manufactured by Nisshin Engineering)
Mix the wax and the polyfunctional compound in a disperser
And the like. The thinner the wax coating, the higher the coating thickness.
The pressure-sensitive adhesive and the above-mentioned polyfunctional compound gradually react and become thicker.
If this happens, the reactivity at the time of heating cannot be sufficiently obtained.
Limited to 05-10 μm, preferably 0.1-6 μm
m, more preferably 0.05 to 6 μm. Photopolymerization of the acrylic pressure-sensitive adhesive composition of the present invention
When obtained by the method, the acrylic copolymer
Monomer composition, photopolymerization initiator, other additives, etc.
Capsule-type cross-linking agent is added in advance to the photopolymerizable composition
After that, photopolymerization is performed. The acrylic pressure-sensitive adhesive composition of the present invention comprises a substrate
It may be used as an adhesive tape by applying to
Examples of the substrate include polyethylene and polypropylene.
Ren, polyethylene terephthalate, polycarbonate
Plastics such as acrylic, vinyl chloride, etc.
Sheet, film, or paper. The acrylic pressure-sensitive adhesive composition of the present invention contains
Polyfunctional compound is coated with wax
Therefore, even if the adhesive strength at room temperature is sufficiently high,
Regardless, the wax melts due to the heat treatment,
The cross-linking reaction between the rill-based pressure-sensitive adhesive composition and the polyfunctional compound
It is thought that the adhesive strength decreases and the removability improves.
You. Examples of the present invention will be described below. still,
Hereinafter, “parts” means “parts by weight”. Also book
All Examples and Comparative Examples of the invention were performed by a photopolymerization method. [Example 1] (Preparation of photopolymerizable composition) 2-ethylhexyl acryle
82 parts, manufactured by Kyoeisha Yushi Co., Ltd., N-vinyl-2-pyro
8 parts of lidone (manufactured by BASF), carboxyethyl acrylic
Rate (manufactured by Daicel UCB) 10 parts,
Inden resin (manufactured by Nippon Steel Chemical Co., Ltd., trade name "ESCRYSTA
A-120S "), 15 parts of a photopolymerization initiator (Ciba-Geigy)
-Product name "Darocur 2959") 1.4 copies
And acrylic rubber (Toa Paint Co., Ltd., trade name "PS-
250 ”) 2.5 parts were uniformly mixed and dissolved to form a photopolymerizable composition.
The product 1 was obtained. (Preparation of Capsule Type Crosslinking Agent) Polyfunctional Compound
Biphenyl epoxy resin (oiled shell epoxy)
Product name “YX-4000” manufactured by Shi Corporation, hereinafter “YX”
Current jet mill (Nisshin Engineering)
Manufactured under the trade name of “CJ-10”).
5 μm granules were obtained. The above granules and distearyl keto
(Hereinafter referred to as “DSK”) to a multi-stage disperser (Nisshin Engine
Nearing Co., Ltd., product name "Dispacoat")
Capsules with a coating thickness of 0.5 μm are mixed and dispersed.
A cross-linking agent was obtained. (Acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive tape)
Preparation of photopolymerizable composition 1 obtained above
9 parts of the above-mentioned capsule-type cross-linking agent is uniformly mixed with 9 parts
After dispersing, 38 μm polyethylene terephthalate
A glass box coated with nitrogen gas and coated on a film
And the irradiation intensity at a wavelength of 360 nm is 1
By irradiating 5mW ultraviolet ray for 3 minutes, the adhesive thickness
Pressure-sensitive adhesive laminated with 50 μm acrylic pressure-sensitive adhesive composition
Got the soup. Example 2 The "YX" used in Example 1
Instead, bisphenol F type epoxy resin (Toto Kaseisha)
"Epototo YDF-2004", trade name "Y
DF ”) to give an average particle size of 3.0 μm
And further coated with DSK to obtain a coating thickness of 0.5 μm.
m of capsule type crosslinking agent was obtained. Furthermore, the same as in the first embodiment
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm by the method
An adhesive tape on which the products were laminated was obtained. [Embodiment 3] Instead of DSK used in Embodiment 2,
Instead, N-stearyl stearamide (hereinafter referred to as "N-
SSA ”)) except that
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm by the method
An adhesive tape on which the products were laminated was obtained. Example 4 The number of DSK coatings in Example 2 was
Example 2 except that the coating thickness was adjusted to 5.0.
Acrylic adhesive with a thickness of 50μm using the same method
The adhesive tape laminated with the agent composition was obtained. [Embodiment 5] Instead of DSK used in Embodiment 2,
Instead, use polyethylene (made by Sanyo Chemical Co.,
171-P ”, hereafter“ PE ”)
Except for the above, the pressure-sensitive adhesive thickness was 50 μm in the same manner as in Example 2.
Tape obtained by laminating the acrylic pressure-sensitive adhesive composition
Was. [Comparative Example 1]
Same as Example 2 except that the coating thickness was 0.03 μm
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm by the method
An adhesive tape on which the products were laminated was obtained. [Comparative Example 2]
The same method as in Example 2 except that the coating thickness was 15 μm
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm
A laminated adhesive tape was obtained. Comparative Example 3 In Example 2, the YDF
The same method as in Example 2 except that the average particle size was 70 μm.
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm
A laminated adhesive tape was obtained. [Comparative Example 4] In Example 2, the YDF
In the same manner as in Example 2 except that nothing was coated
Acrylic pressure-sensitive adhesive composition with a pressure-sensitive adhesive thickness of 50 μm
A layered adhesive tape was obtained. [Comparative Example 5] The photopolymerizable group used in Example 2
Product 1 was obtained by adding 87 parts of 2-ethylhexyl acrylate, N
-Vinyl-2-pyrrolidone 13 parts, hydrogenated coumarone-in
Den resin (Nippon Steel Chemical Co., Ltd., product name "S-Crystal A
-120S ") 15 parts, photopolymerization initiator (Ciba-Geigy)
Manufactured by Daro Cure 2959)
Acrylic rubber (trade name “PS-25” manufactured by Toa Paint Co., Ltd.)
0 ") Photopolymerizable composition 2 in which 2.5 parts were uniformly mixed and dissolved.
Pressure-sensitive adhesive in the same manner as in Example 2 except that
Adhesive laminated 50μm thick acrylic adhesive composition
I got the tape. The evaluation items and evaluation methods are shown below. (Measurement of Average Particle Size of Polyfunctional Compound) Examples 1 to 5 above
And average particles of the polyfunctional compound obtained in Comparative Examples 1 to 5
The diameter is measured by a laser diffraction particle size analyzer (manufactured by Seishin Enterprise,
Laser diffraction method using product name "PRO-7000S")
Shows the result of measuring the average particle size of the polyfunctional compound.
1 and 2. (Measurement of wax coating thickness)
1-5, caps after coating obtained in Comparative Examples 1-3 and 5
Cell type cross-linking agent was embedded in epoxy resin and sliced
Rear transmission electron microscope (H-600, manufactured by Hitachi, Ltd.)
And acceleration conditions: 100 kV and R
uO _Four The results of measuring the coating thickness by the dyed ultrathin section method
The results are shown in Tables 1 and 2. (Measurement of Initial Adhesive Strength)
And the adhesive tape obtained in Comparative Examples 1 to 5 was 20 mm × 1
Cut to 00mm and put 2kg pressure roller on SUS plate
And then pressed at a speed of 300 mm / min.
According to JIS Z0237 for those left for 30 minutes
Based on the result of measuring 180 ° peel adhesion to SUS
Are shown in Tables 1 and 2. The unit is kg / 20mm
You. (Measurement of Adhesive Strength After Heating)
5 and the adhesive tapes obtained in Comparative Examples 1 to 5 were 20 mm
Cut to × 100mm, 2kg pressure roller on SUS plate
After crimping at a speed of 300 mm / min using a
Leave for 20 minutes at room temperature, and further in an oven at 120 ° C for 10 minutes.
After heating for 20 minutes and cooling at room temperature for 20 minutes
In accordance with JIS Z0237, SUS 180 ℃ peak
Tables 1 and 2 show the results of measuring the adhesive strength. unit
Is kg / 20 mm. (Measurement of Adhesive Strength with Time) The above Examples 1 to 5 and
And the adhesive tape obtained in Comparative Examples 1 to 5 at 60 ° C
After leaving it in the bun for one week, it becomes 20mm x 100mm
Cut the SUS plate using a 2 kg pressure roller.
After pressure bonding at a speed of 0 mm / min, release at room temperature for 30 minutes
In accordance with JIS Z0237,
Table 1 shows the results of measuring the 180 ° C peel adhesive strength of US.
And 2 The unit is kg / 20 mm. (Measurement of Surface Smoothness) Examples 1 to 5
And Table of the adhesive surface of the adhesive tape obtained in Comparative Examples 1 to 5
Tables 1 and 2 show the results of visual observation of the surface state. [Table 1] [Table 2] The acrylic pressure-sensitive adhesive composition of the present invention includes:
The wax-coated polyfunctional compound is dispersed
Therefore, when used at room temperature as an adhesive tape,
Despite having a sufficiently high adhesive strength, it becomes sticky by heat treatment
The force is significantly reduced and peeling is possible. Therefore, the present invention
Acrylic pressure-sensitive adhesive composition
It is suitably used for masking applications and temporary fixing applications.

Continuation of front page (56) References JP-A-5-51565 (JP, A) JP-A-5-43851 (JP, A) JP-A-5-9449 (JP, A) JP-A-5-255652 (JP) JP-A-7-34051 (JP, A) JP-A-7-11211 (JP, A) JP-A-8-100161 (JP, A) JP-A-8-104857 (JP, A) 5-311140 (JP, A) JP-A-62-263573 (JP, A) JP-A-61-101578 (JP, A) JP-A-56-61468 (JP, A) (58) Fields investigated (Int. Cl ^7, DB name) C09J 4/00 -. 201/10 C08G 18/00 - 18/87 C08G 59/00 - 59/72

Claims (1)

(57) [Claim 1] A wax in an adhesive comprising an acrylic copolymer having at least one or more functional groups selected from the group consisting of a carboxyl group, a hydroxyl group and an amino group. Average particle size of polyfunctional compound having two or more epoxy groups or two or more isocyanate groups in the molecule, coated to a thickness of 0.05 to 5.0 μm, having an average particle size of 0.1 to 50.
An acrylic pressure-sensitive adhesive composition characterized by dispersing a capsule-type cross-linking agent composed of μm granular material.