ASPARTATE-FUNCTIONAL POLYHYDANTOIN PREPOLYMERS AND THEIR USE IN COATING COMPOSITIONS

摘要

The present invention relates to aspartate-functional hydantoinprepolymers prepared by reacting a polyisocyanate having a functionalityof at least 1.8 with a polyaspartate corresponding to the formula(see formula I)whereinX represents an organic group which has a valency of n and is inerttowards isocyanate groups at a temperature of 100°C or less, andR1 and R2 may be the same or different and represent optionallysubstituted hydrocarbon radicals,R3 and R4 may be identical or different and represent hydrogen ororganic groups which are inert towards isocyanate groups at atemperature of 100°C or less andn has a value of 2 to 6, preferably 2 to 4 and more preferably 2.The present invention is also directed to compositions suitable forthe production of coatings, adhesives, elastomers, potting compounds orcomposite matrices containing these polyhydantoin prepolymers incombination with optionally blocked polyisocyanates.