Patent ID: 7709589
Filing Date: 2010-05-04
Classification: C08G,Y10T

Abstract:
1. A curable polyurethane composition, comprising: A) at least one curing agent which contains uretdione groups and is derived from aliphatic, (cyclo)aliphatic, cycloaliphatic, or aromatic polyisocyanates, or mixtures thereof, and one or more hydroxyl-containing compounds, and has a free NCO content of less than about 5% by weight, based on the total weight of component A), and a uretdione content of from about 1% to about 18% by weight, based on the total weight of component A); B) one or more catalysts selected from the group consisting of C) optionally, at least one hydroxyl-containing polymer having an OH number between about 20 and 500 mg KOH/gram, at least one amino-containing polymer of comparable amine content, or mixtures thereof; D) optionally, at least one compound which is reactive toward acid groups, and has a weight fraction, based on the total composition, from about 0.1% to about 10%; E) optionally one or more acids in monomeric form, polymeric form, or mixtures thereof, in a weight fraction, based on the total composition, from about 0.1% to about 10%; and F) optionally one or more auxiliaries, additives, or mixtures thereof; and wherein the fraction of the one or more catalysts under B) is from about 0.001% to about 5% by weight, based on the total amount of the components, and wherein the composition has a melting point above about 40° C., and wherein components A), and, when present, C) are present in a proportion, such that for each hydroxyl and/or amine group of component C), there is more than 1 uretdione group of component A).