Polyisocyanate-modified polycarboxylic acids

US7329717B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Hans-Josef Laas · Odenthal, DE
• Christoph Gürtler · Cologne, DE
• Reinhard Halpaap · Odenthal, DE
• Michael Grahl · Leverkusen, DE
• Peter Thometzek · Bensberg, DE
• James Rawlins · Petal, US

Key dates

• Filing date: Jun 21, 2004
• Grant date: Feb 12, 2008
• Expiry date: May 15, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8064
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing polyisocyanate-modified polycarboxylic acids by conversion of anhydride-group-free polycarboxylic acids with isocyanate-functional compounds. The process includes 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 1.2:1 to 120:1. The polyisocyanate-modified polycarboxylic acids are solid below 40° C. and liquid above 130° C., and have an average carboxylic acid functionality of at least 1.8, a content of free carboxylic acid groups of from 4.0 wt. % to 80.0 wt. % and a content of amide groups of from 0.4 wt. % to 32.5 wt. %.