Carboxy-functional crosslinkers for epoxy-functional powder-lacquer binding agents

US7148295B2 · 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: Dec 12, 2006
• Expiry date: Jun 21, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31938
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the use of special mixtures of at least two polycarboxylic acids as crosslinker components for thermally curing powder-lacquer binding agents having groups that are capable of reacting with carboxyl groups. The mixtures include at least two polycarboxylic acids each melting above 95° C. and having up to 20 carbon atoms and consist of at least 5 wt. %, of the polycarboxylic acid with the lowest melting point and at least 10 wt. %, of the polycarboxylic acid with the highest melting point of all polycarboxylic acids present in the mixture to at least 5 wt. %. Additionally, the polycarboxylic acid mixture is a solid below 40° C. and a liquid above 160° C.