Heat-sensitive adhesive sheet
First Claim
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
,β
-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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Accused Products
Abstract
A heat-sensitive adhesive sheet comprising a substrate having formed thereon an adhesive layer comprising a polymer composition (C) which comprises the following aqueous emulsion (A) and copolymer (B), wherein 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: Aqueous emulsion (A): An aqueous emulsion containing an alkyl (meth)acrylate-based polymer (a) having a glass transition temperature of −10° C. or below, which is obtained by emulsion-polymerizing radically polymerizable monomers containing as the main component an alkyl (meth)acrylate; and Copolymer (B): A water-soluble or water-dispersible copolymer (B) having a glass transition temperature of 20° C. or above, which is a copolymer obtained by copolymerizing an α,β-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 below.
28 Citations
8 Claims
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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
,β
-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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 10°
Specification