HEAT-SENSITIVE SELF-ADHESIVE COMPOSITION AND HEAT-SENSITIVE SELF-ADHESIVE SHEET

摘要

PROBLEM TO BE SOLVED: To obtain a heat-sensitive self-adhesive compsn. excellent in water resistance by incorporating, into the same, a water-soluble resin component of which either one of the graft main chain and side chain is hydrophilic and the other is hydrophobic and a polymer component which is prepd. by the emulsion polymn. of a free-radical polymerizable monomer and has a specified glass transition temp. or lower. ;SOLUTION: Pref., this compsn. contains a water-soluble resin component (A) of which either one of the graft main chain and side chain, pref. accounting for 10-70 wt.%, is hydrophilic and the other is hydrophobic and a polymer component which is prepd. by the emulsion polymn. of a free-radical polymerizable monomer and has a glass transition temp. of -20°C or lower in a wt. ratio of A/B of (10/90)-(50/50). Pref., this compsn. forms, on a substrate, a self-adhesive layer which, when dried at a low temp., exhibits a sea-island structure comprising component A as the sea and component B as the islands and has a self-adhesive power of 10 g/25 mm or lower and which, when subjected to a heat treatment at 60°C or higher, undergoes the inversion of the sea and islands, i.e., exhibits a sea-island structure comprising component A as the islands and component B as the sea and has a self-adhesive power of 100 g/25 mm or higher.;COPYRIGHT: (C)1999,JPO