Process for producing decorative multiple-layer coatings

US5681622A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Bettina Vogt-Birnbrich · Solingen, DE
• Hans-Peter Patzschke · Wuppertal, DE
• Werner Lenhard · Wuppertal, DE
• Jurgen Dobert · Sprockhövel, DE
• Marcus Brunner · Wuppertal, DE

Key dates

• Filing date: Feb 13, 1996
• Grant date: Oct 28, 1997
• Expiry date: Feb 13, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/5042
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process and a coating medium for producing a decorative multilayer coating on a substrate, wherein a base lacquer coat is applied and is overpainted with a transparent lacquer coat, wherein an aqueous, self-crosslinking base lacquer is used, which contains, as a binder vehicle, an aqueous polyurethane resin dispersion based on a polyurethane resin having a number average molecular weight (Mn) of 2500 to 120,000, a content of 10 to 400 mmole of lateral and/or terminal hydroxyl and/or R'O groups bonded to silicon, where EQU R'=a C.sub.1 to C.sub.8 alkyl or C(O)R''', and EQU R'''=a C.sub.1 to C.sub.10 alkyl, per 100 g solid resin, a hydroxyl number of 0 to 150, wherein hydroxyl groups bonded to silicon are not included in the calculation of the OH number, and a content of ionic groups, groups convertible into ionic groups and/or hydrophilic groups of 5 to 200 mEqu per 100 g solid resin.