Patent ID: 6368707
Filing Date: 2002-04-09
Classification: C08L,C09J,Y10T

Abstract:
A heat-sensitive adhesive sheet, characterized in that it is a heat-sensitive adhesive sheet having on a substrate an adhesive layer comprising a polymer composition emulsion (C) obtained by emulsion polymerizing a radically polymerizable monomer comprising as a main component, an alkyl (meth)acrylate forming an alkyl (meth)acrylate-based polymer (a) having a glass transition temperature of âˆ’10Â° C. or less, in an aqueous medium in the presence of a water-soluble or water-dispersible copolymer (B) having a glass transition temperature of 20Â° C. or more, which is a copolymer having an acid value of 30-260 mgKOH/g obtained by copolymerizing an &agr;,&bgr;-ethylenically unsaturated carboxylic acid with other radically polymerizable monomers, wherein a part or the entire amount of carboxyl groups in the copolymer is neutralized with a base having a boiling point of 110Â° C. or less; and that an adhesive force determined by the 180Â° peeling test method as specified in JIS Z 0237 at a temperature of 25Â° C. is 10 g/25 mm or less, and wherein the amount of carboxyl groups neutralized in the copolymer (B) is at least 30 mol % of the carboxyl groups.