Aqueous polyesters, a process for their production and their use in high-solids stoving lacquers

US5280062A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harald Blum · Wachtendonk, DE
• Hans-Heribert Burgdorfer · Cologne, DE
• Armin Sickert · Krefeld, DE
• Peter Hohlein · Kempen, DE

Key dates

• Filing date: Jan 15, 1992
• Grant date: Jan 18, 1994
• Expiry date: Jan 15, 2012

Classification

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

Abstract

The present invention relates to aqueous polyesters for high-solids stoving coatings which contain PA0 a) 35.0 to 65.0% by weight of a polyester resin containing urethane, carboxyl and hydroxyl groups and containing the reaction product of PA1 77 to 89% by weight of a branched polyester polyol having a hydroxyl number of 125 to 175, an acid number of less than 4 and a molecular weight of 2,500 to 6,500, PA1 2) 2.5 to 4.5% by weight of a 2,2-bis-(hydroxymethyl)alkane carboxylic acid, PA1 3) 0 to 3.5% by weight of a diol component having a molecular weight of 62 to 250 and PA1 4) 9 to 19% by weight of a diisocyanate component, PA1 wherein the percentages of a1), a2), a3) and a4) add up to 100%, based on the weight of a1), a2), a3) and a4), PA0 b) 0.1 to 1.5% by weight of a basic neutralizing agent which is sufficient to convert 35 to 100% of the carboxyl groups of component a) to carboxylate groups, PA0 c) 0 to 7.5% by weight of an organic auxiliary solvent and PA0 d) 26 to 64.9% by weight water, wherein the percentages of a), b), c) and d) add up to 100%, based on the weight of a), b), c) and d).