Polyisocyanate-modified polycarboxylic acids

摘要

Production of polyisocyanate modified polycarboxylic acids, that are solid below 40 deg. C and liquid above 130 deg. C, with an average carboxyl functionality of at least 1.8 and an anhydride group content of 0.4-32.5 wt.%, comprises reaction of an anhydride group-free polycarboxylic acid component and an isocyanate functionalized component with maintenance of the equivalent ratio of carboxyl groups to isocyanate groups at 1.2:1-120:1. - A process for the production of polyisocyanate modified polycarboxylic acids (I), that are solid below 40 deg. C and liquid above 130 deg. C, with an average carboxyl functionality of at least 1.8, a free carboxyl group content of 4.0-80.0 wt.% and an anhydride group content of 0.4-32.5 wt.%, comprises reaction of: - (a) an anhydride group-free polycarboxylic acid component and; - (b) an isocyanate functionalized component having an average isocyanate functionality of at least 1.8 with maintenance of the equivalent ratio of carboxyl groups to isocyanate groups at 1.2:1-120:1.