Patent ID: 9328189
Filing Date: 2016-05-03
CPC Classification: C08G,C08K

Claim Text:
1. A method for polymerizing an aromatic multi-functional carbodiimide; said method comprising contacting the aromatic multi-functional carbodiimide with a carboxylic acid salt at a temperature from 15° C. to 90° C.; wherein the aromatic multi-functional carbodiimide is a carbodiimide prepolymer having an average carbodiimide functionality from 1.3 to 6; the carbodiimide prepolymer contains: (i) polymerized residues of diphenyl methane diisocyanate and from 31 to 45 wt % of an aliphatic polyol, (ii) carbodiimide groups, and (iii) urethane groups having aliphatic substituents; and the carbodiimide prepolymer has a carbodiimide content from 2 to 5 wt %.