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Pressure sensitive adhesive and pressure sensitive adhesive tape
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A pressure-sensitive adhesive, unsaturated technology, applied in the field of adhesive tape, can solve the problems of deterioration of coating working conditions, coating unevenness, coating surface appearance deterioration, etc.
Active Publication Date: 2012-01-11
3M INNOVATIVE PROPERTIES CO
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[0003] However, primers generally contain volatile organic solvents, so there are problems such as deterioration of coating working conditions caused by volatilization of solvents when or after primer coating, or at places where primer coating materials are used environmental degradation (e.g. inside a vehicle or in a confined space such as a room)
There are also problems such as it takes a certain working time to apply the primer, coating unevenness, forgetting to apply depending on the worker, and deterioration of the appearance of the coated surface due to contamination of the primer
Method used
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[0082] Examples 1, 2, 5-12 and 14-55, Comparative Examples 7-16
[0083] The monomers and other components shown in Tables 1-12 were mixed and dissolved in a vessel with stirring (24 hours at 65°C). If the components include chlorinated polyolefins (available as 892LS from Nippon Paper Chemicals Co.LTD.), mix and stir the monomer and chlorinated polyolefins in a vessel (65°C for 60 minutes), then mix the remaining components The chlorinated polyolefin solution was added and dissolved with stirring.
[0084] The resulting mixture was placed between 50 micron thick release-treated PET films (from Mitsubishi Chemical), and then coated by knife coating. Subsequently, the sample was treated with UV radiation (wavelength 300 to 400 nm, power 0.5 to 7 mW / cm2) for 6 minutes and cured, and then a pressure-sensitive adhesive was obtained. The resulting sample had a thickness of 100 micrometers.
[0085] One PET film of the resulting pressure sensitive adhesive was peeled off and a ...
example 3 and 4， comparative example 3-6
[0096] A photopolymerization initiator was added to the monomers listed in Tables 1 and 2 with the content indicated in the above column, then replaced with nitrogen (deoxygenation), and then cured with UV to obtain a prepolymer with a viscosity of about 1000 cps to about 5000 cps. Then the photopolymerization initiator, crosslinking agent, block copolymer and hydrogenated tackifier were added with the contents indicated in the following column and stirred in the vessel at 65° C. for 24 hours to dissolve. Subsequently, samples were obtained in the same manner as in Example 1.
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Abstract
A pressure sensitiveadhesive is obtained by polymerizing a mixture containing: (1) 100 mass parts of (meth)acrylic monomer comprising 98-50 mass parts of a first monomer selected from an aliphatic (meth)alkylacrylate having a carbon number of 4-6 and an aliphatic (meth)alkylacrylate having a carbon number of 7-12, wherein the glass transition temperature of a homo-polymer thereof is -25 degrees C or less; and 2-50 mass parts of a second monomer comprising one or more selected from the group consisting of: an amide group-containing ethylenic unsaturated copolymerizing monomer, a carboxylic group-containing ethylenic unsaturated copolymerizing monomer, an amino group- containing ethylenic unsaturated copolymerizing monomer, a non-tertial alkyl(meth)acrylate wherein the glass transition temperature of a homo-polymer thereof is -25 degrees C or more; and a monomer represented by the chemical structural formula (I) CH2=CR1COO(R2O)nR3 or CH2=CR1COOR4R5 (R1methyl or H; R2 and R4 = linear or branched alkyl having a carbon number of 1-6; R3 =methyl, ethyl, or substituted or non- substituted phenyl; R5=substituted or non-substituted 4-membered or 5-membered ring containing oxygen; n=1-16); (2) 10-100 mass parts of a block copolymer; (3) 20-100 mass parts of hydrogenated tackifier; and (4) 0.05-1.0 mass parts of a photopolymerization initiator.
Description
Background technique [0001] The present disclosure relates to pressure sensitive adhesives. In particular, the present disclosure relates to pressure sensitive adhesives obtained by polymerization of acrylic monomers, block copolymers, hydrogenated tackifiers and photopolymerization initiators. Furthermore, the present disclosure relates to an adhesive tape comprising an adhesive layer containing such a pressure-sensitive adhesive. [0002] Low surface energy (LSE) substrates are commonly used in products used in a variety of conditions, such as automotive parts, building materials, electronic parts, and OA devices. When adhesives are used to bond those materials, the adhesives may not provide the desired level of adhesion. As a result, the primer tends to be coated on the surface of the material as a pretreatment agent. [0003] However, primers generally contain volatile organic solvents, so there are problems such as deterioration of coating working conditions caused by ...
Claims
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