Pressure sensitive adhesive and pressure sensitive adhesive tape

Abstract

A pressure sensitive adhesive 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)alkyl acrylate having a carbon number of 4-6 and an aliphatic (meth)alkyl acrylate 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 ...

AI Technical Summary

Problems solved by technology

[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

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