Method for producing multilayer coatings

US5721018A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Wolfgang Goldner · Heiligenhaus, DE
• Werner Lenhard · Wuppertal, DE
• Albrecht Luttenberg · Wuppertal, DE
• Hans-Peter Patzschke · Wuppertal, DE

Key dates

• Filing date: Apr 26, 1996
• Grant date: Feb 24, 1998
• Expiry date: Apr 26, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D2451/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for preparing a multi-layer coating on an electrically nonconductive surface of a substrate, which comprises PA1 (A) applying over the surface an aqueous dispersion having a pH of from 5 to 8 when not containing a metallic pigment, the dispersion containing of from 15% to 20% wt. based on the dispersion of a base coat resin without metallic pigments then having a nonvolatile content of from about 30% to about 50% wt. based on the base coat resin of PA2 (i) from 75% to 98% wt. based on base coat resin solids of one or more partially or completely acid neutralized cationic, polyurethane, and polyurethane-urea resins, having a OH number of up to 450, and an amine number of from 20 to 200, and PA2 (ii) from 2% to 25% wt. based on base coat resin solids of one or more of an amine-formaldehyde condensation resin alone or in admixture with a blocked polyiisocyanate in either case having at least two groups per molecule being reactive with one or more of amino, OH.sup.-, urethane, and urea groups in (i), the aqueous dispersion further containing one or more of a pigment, a filler, and a lacquer additive, and up to 15% wt. based on the dispersion of an organic solvent for said res…