Patent ID: 6355761
Filing Date: 2002-03-12
Classification: C08G,C09D

Abstract:
A coating composition comprisingat least one OH-functional binder component and at least one component compound that functions as a crosslinking agent and that has NCO groups blocked with a pyrazole compound, wherein the component compound that functions as a crosslinking agent is obtained by a) polymerizing a polyol or a mixture of polyols having a number-average molecular weight in the range from 300-5000 and a polyisocyanate compound A or a mixture of polyisocyanate compounds A to give a polyurethane prepolymer, a1) partially blocking the prepolymer with a pyrazole compound or mixture of pyrazole compounds; b) chain-extending the partially blocked prepolymer by adding a chain extender compound different from the polyol, to give a polyurethane polymer having free OH groups, and c) reacting the OH-containing polyurethane polymer from b) with a polyisocyanate B different from polyisocyanate A or a mixture of polyisocyanates B.