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Heat-sensitive adhesive sheet

  • US 6,368,707 B1
  • Filed: 01/07/1999
  • Issued: 04/09/2002
  • Est. Priority Date: 07/19/1996
  • Status: Expired due to Fees
First Claim
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1. 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 −

  • 10°

    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 20°

    C. or more, which is a copolymer having an acid value of 30-260 mgKOH/g obtained by copolymerizing an α



    -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 110°

    C. or less; and

    that an adhesive force determined by the 180°

    peeling test method as specified in JIS Z 0237 at a temperature of 25°

    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.

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