Patent ID: 8247514
Filing Date: 2012-08-21
Classification: C08G,C09J

Abstract:
1. A silylated polyurethane composition comprising silylated polyurethane prepolymer prepared from a process which comprises: (a) reacting a polyol being a blend of two or more polyester polyols possessing an average of hydroxyl group of the blend ranging from about 2.05 to about 2.75 with a polyisocyanate in the presence of a catalyst at a molar ratio of NCO to OH from about 0.3 to about 0.95 to provide a hydroxyl-terminated polyurethane prepolymer, (b) reacting said hydroxyl-terminated polyurethane prepolymer with an isocyanatosilane to form said silylated polyurethane prepolymer, wherein less than 95 percent of the hydroxyl-terminated polyurethane prepolymer is silylated, with the proviso that if said polyester polyol comprises a crystalline polyester diol, said diol has a melting point of less than 50° C.