THERMOSETTING POLYURETHANE ELASTOMER COMPOSITION, POLYURETHANE ELASTOMER AND PROCESS FOR PRODUCTION THEREOF

摘要

A polyurethane elastomer having low hardness, high strength, and high elongation, which is produced by curing an isocyanate-terminated prepolymer (i) obtained by reacting a polyoxyalkylene polyol having an average number of hydroxyl groups exceeding 2, a total degree of unsaturation of less than 0.05 meq/g, and a number-average molecular weight of 4000 to 20000 with a polyisocyanate compound with a curing agent (ii) containing as the curing components a polyoxytetramethylene polyol (a) and a chain extender (b) bearing two active hydrogen-containing groups and having a number-average molecular weight of 500 or below.