POLYURETHANE / POLYURETHANE-UREA RESIN AND PROCESS FOR PRODUCING THE SAME

摘要

A process for producing a polyurethane / polyurethane-urea resin which comprises reacting a high-molecular active-hydrogen compound with a polyisocyanate compound to obtain an isocyanate-terminated polyurethane prepolymer (A), reacting the prepolymer (A) with a chain extender (B) in a solvent, and then removing the solvent, characterized by using as the prepolymer (A) an isocyanate-terminated polyurethane prepolymer obtained by reacting a specific polyol (1) with a polyisocyanate compound under isocyanate-excess conditions and then reacting the reaction product with a specific polyol (2) under isocyanate-excess conditions.