Patent ID: 7329717
Filing Date: 2008-02-12
Classification: C08G

Abstract:
1. A process for preparing polyisocyanate-modified polycarboxylic acids comprising reacting A) an anhydride-group-free polycarboxylic-acid component with B) an isocyanate-functional component having an (average) isocyanate functionality of at least 1.8 at an equivalent ratio of carboxylic acid groups to isocyanate groups of from 2:1 to 50:1; wherein the polyisocyanate-modified polycarboxylic acids are solid below 40° C. and liquid above 130° C., and have a) an average carboxylic acid functionality of at least 1.8, b) a content of free carboxylic acid groups (determined as —COOH; molecular weight=45) of from 4.0 wt. % to 80.0 wt. % and c) a content of amide groups (determined as —CONH—; molecular weight=43) of from 0.4 wt. % to 32.5 wt. %.