Patent ID: 6677424
Filing Date: 2004-01-13
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 isocyanate groups blocked with a pyrazole compound, wherein the component compound which functions as a crosslinking agent is prepared by a) polyrnerizing a polyol or a mixture of polyols having number-average molecular weight in the range of 300-5000 and a polyisocyanate compound A or a mixture of polyisocyanate compounds A to give an isocyanate functional polyurethane prepolymer, a1) partially blocking the isocyanate functional polyurethane prepolymer with a pyrazole compound or a mixture of pyrazole compounds, b) providing a polyisocyanate compound B consisting of trimerized hexamethylene diisocyanate, b1) partially blocking the polyisocyanate B with a pyrazole compound, or a mixture of pyrazole compounds, and c) chain extending by reacting a mixture of the partially blocked isocyanate compounds formed in steps a1 and b1 with a chain extender compound.