Patent ID: 6503997
Filing Date: 2003-01-07
Classification: C08G

Abstract:
A polyurethane/polyurethane urea resin obtained by reacting an isocyanate group-terminated polyurethane prepolymer (A) obtained by reaction of a high molecular weight active hydrogen compound and a polyisocyanate compound, with a chain extender (B),wherein the isocyanate group-terminated polyurethane prepolymer (A) is an isocyanate group-terminated polyurethane prepolymer obtained by (a) reacting the following polyol (1) with a polyisocyanate compound in the presence of an excess amount of an isocyanate group until the reaction is essentially complete, followed by (b) further reacting the following polyol (2) with the reaction product of (a) in the presence of an excess amount of an isocyanate group, the weight ratio of polyol (1)/polyol (2) being from 5/95 to 70/40; Polyol (1): a polyoxyalkylene polyol having a hydroxyl group value of at most 70, a total unsaturation degree of at most 0.07 meq/g and an oxypropylene group content of at least 70 wt % and containing a secondary hydroxyl terminal group, Polyol (2): a polyol selected from the group consisting of polyoxytetramethylene glycol, polyester polyol, polycaprolactone polyol and polycarbonate polyol.