Low-yellowing aqueous clear powder coating dispersions, method of making the dispersions, and process for producing clearcoat finishes with the dispersions

US6770329B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Gunther Ott · Hachenburg, DE
• Joachim Woltering · Hachenburg, DE
• Wilfried Stubbe · Greven, DE
• Ulrike Rockrath · Senden, DE
• Maximilian Bendix · Hachenburg, DE
• Ulrich Kalck · Schifferstadt, DE
• Jan Berg · Sarpsborg, NO
• Gotz-Ekkehard Sapper · Rimpar, DE

Key dates

• Filing date: Oct 17, 2002
• Grant date: Aug 3, 2004
• Expiry date: Oct 17, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31504
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for producing single-coat or multicoat clearcoat finishes on primed or unprimed substrates by applying at least one powder coating dispersion, in particular a powder clearcoat slurry, to the substrate and then curing the resulting film(s) thermally and/or with actinic radiation, in which oxalic acid is added to at least one powder coating dispersion, in particular to a powder clearcoat slurry.