Patent ID: 6809171
Filing Date: 2004-10-26
Classification: C08G,C09J,Y10S

Abstract:
A polyurethane binder with a low content of readily volatile isocyanate-functional monomers containing components A, B and C, wherein;a. A comprises a polyurethane prepolymer containing at least two isocyanate groups or a mixture of two or more polyurethane prepolymers containing at least two isocyanate groups, wherein at least one polyurethane prepolymer contains at least two differently attached types of isocyanate groups or two different polyurethane prepolymers containing at least two differently attached types of isocyanate groups in pairs of which at least one type has a lower reactivity to isocyanate-reactive groups than the other type(s); b. B comprises an at least difunctional isocyanate which does not contain one nitrogen atom that is not part of an NCO group, or a mixture of two or more thereof, wherein the binder contains from about 3% to 25% by weight of component B; and c. C comprises an at least difunctional isocyanate or a mixture of two or more isocyanates with an average functionality of at least two which contains at least one nitrogen atom that is not part of an NCO or urethane group per isocyanate molecule wherein the polyurethane binder contains at least about 5% by weight of component C and has a viscosity at 50Â° C. less than 5,000 mPas (as measured by a Brookfield RVTDV II viscometer, spindle 27, at 20 r.p.m.).