Adhesive thermoplastic compositions

Claim 1

A thermoplastic, thermofusible adhesive composition comprising as essential elements: (1) 100 parts of a butyl rubber having a Mooney viscosity (ML 1+3 at 127° C.) of 30 to 80, (2) 50 to 1000 parts resinous constituents comprising: (a) an adhesion improving amount up to 300 parts terpene-phenolic resin having a softening point (ring and ball) of up to 200° C.; (b) a sag resistance improving amount up to 200 parts ethylene-vinyl acetate copolymer having a melt flow index of not more than 700; and (c) 0 to 500 parts aliphatic hydrocarbon resin, coumarone- indene resin, or a combination thereof having a softening point (ring and ball) of about 100° C.; (3) 1 to 300 parts of a block copolyetheresteramide consisting of a product resulting from the polyconsendation of an α, ω-dicarboxylic polyamide or copolyamide having a number average molecular weight of 300 to 15,000, employed in an amount of 90 to 5% by weight and of an aliphatic α, ω-dihydroxylated polyoxyalkylene having a number average molecular weight of 100 to 6,000, employed in an amount of 10 to 95% weight, the said polycondensation product having a softening point (ring and ball) of between 80° and 210° C. and a viscosity in the molten state of 10 to 2,000 Pa.s (200° C.); (4) an adhesion improving amount up to 500 parts of polyisobutylene having a number average molecular weight of at most 50,000; and (5) a reinforcing amount up to 300 parts of fillers.