Additive for aqueous coating systems

US5914374A · kind A · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Vera Block · Bönen, DE
• Harald Borgholte · Munster, DE
• Uwe Meisenburg · Duisburg, DE
• Heinz-Peter Rink · Hachenburg, DE
• Ludwig Moorkamp · Munster, DE

Key dates

• Filing date: Feb 20, 1997
• Grant date: Jun 22, 1999
• Expiry date: Feb 20, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A urethanized polyester is claimed which is suitable as an additive for aqueous coating systems, which is obtainable by, in a first reaction stage (A), subjecting PA1 (a) from 10 to 45 mol-% of one or more diols, PA1 (b) from 5 to 50 mol-% of one or more polyols having at least 3 OH groups, and PA1 (c) from 35 to 47 mol-% of one or more aromatic, aliphatic or cycloaliphatic polycarboxylic acids and/or reactive derivatives thereof to a polycondensation reaction in a manner known per se until the reaction mixture has an acid number of from 1 to 10, and, in a reaction stage (B), reacting the resulting reaction product in a manner known per se with an organic polyisocyanate. The urethanized polyester is outstandingly suitable as an additive for aqueous coating materials in order to improve the rheological stabilization of coating materials.