Method for improving the adhesion of the intermediate layer in a multi-paint finish

US7579048B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Egon Wegner · Munster, DE
• Stephan Schwarte · Münster, DE

Key dates

• Filing date: Mar 3, 2004
• Grant date: Aug 25, 2009
• Expiry date: Oct 14, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for improving the intercoat adhesion in a multicoat paint system utilizing a primer coat, an aqueous basecoat, and a clearcoat, where the multicoat paint system has been produced by means of a wet-on-wet technique. The clearcoat is produced using a pseudoplastic powder clearcoat slurry prepared by a secondary dispersion process or a melt emulsification process. The aqueous basecoat material used to produce the aqueous basecoat comprises a dispersed graft copolymer whose particles are composed of a hydrophobic core of copolymerized olefinically unsaturated monomers and of a hydrophilic shell which comprises a polyurethane, where said copolymer is prepared by free-radical (co)polymerization of the monomers in the presence of at least one polyurethane containing specially selected olefinically unsaturated groups.