Method for producing a multicoat paint system

US9868134B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Bernhard Steinmetz · Meiningen, DE
• Holger Krumm · Krefeld, DE
• Stephanie Pei Yii Goh · Munster, DE
• Peter Hoffmann · Senden, DE
• Hardy Reuter · Kohlenbissen, DE
• Peggy Jankowski · Würzburg, DE
• Nadia Luhmann · Karlstadt, DE

Key dates

• Filing date: Nov 18, 2014
• Grant date: Jan 16, 2018
• Expiry date: Nov 18, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D7/577
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for producing a multicoat paint system on a metallic substrate, in which a basecoat or a plurality of directly successive basecoats are produced directly on a metallic substrate coated with a cured electrocoat, a clearcoat is produced directly on the one basecoat or the uppermost of the plurality of basecoats, and then the one or more basecoats and the clearcoat are jointly cured, and wherein at least one basecoat material used for production of the basecoats comprises at least one aqueous dispersion comprising at least one copolymer (CP), said copolymer (CP) being preparable by initially charging an aqueous dispersion of at least one polyurethane, and then polymerizing a mixture of olefinically unsaturated monomers in the presence of the polyurethane from (i), in which a water-soluble initiator is used, the olefinically unsaturated monomers are metered in such that a concentration of 6.0% by weight, based on the total amount of olefinically unsaturated monomers used for polymerization, in the reaction solution is not exceeded over the entire reaction time, and the mixture of the olefinically unsaturated monomers comprises at least one poly…