Aspartate-terminated urea/urethane prepolymers and their use in coating compositions

Abstract

The present invention relates to aspartate-terminated urea/urethane prepolymers that are based on the reaction products of NCO prepolymers with compounds corresponding to the formula 1 wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100° C. or less, R1, and R2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, R3 and R4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less and n represents an integer with a value of at least 2, at an equivalent ratio of aspartate groups to isocyanate groups of 1.5:1 to 20:1. The present invention also relates to coating compositions containing the aspartate-terminated urea/urethane prepolymers and a polyisocyanate.

Dependencies are inferred from the claim text.