Water-thinnable baking paints and use thereof as filler material and intermediate stone chip resistant coat, as well as process for painting motor vehicle bodies

US5210154A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Klaus Weidemeier · Munster, DE
• Winfried Schmidt · Brunsbüttel, DE
• Hans-Dieter Hille · Bensberg, DE
• Bodo Müller · Tornesch, DE

Key dates

• Filing date: Dec 10, 1990
• Grant date: May 11, 1993
• Expiry date: Dec 10, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D167/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to water-thinnable baking paints, the use thereof as filler material and intermediate stone chip resistant coat as well as a process for painting motor vehicle bodies. The water-thinnable baking paints comprise as binders a combination of PA0 (I) 20 to 70% by weight of a water-thinnable polyurethane resin with an acid value of 15 to 35, PA0 (II) 20 to 70% by weight of an epoxy resin-modified water-thinnable polyester which can be prepared by reacting a polyester (A) with a molecular weight (number average) below 2000, an acid value of 35-240 and a hydroxyl value of 56-320, with 0.3 to 1.5 equivalents per polyester molecule of an epoxy resin (B) having an epoxide equivalent weight of 170 to 1000, based on a bisphenol, and/or with a derivative of this epoxy resin (C) containing at least one epoxide group per molecule under reaction conditions where essentially only carboxyl groups react with epoxide groups, and PA0 (III) 0 to 20% by weight of a water-thinnable aminoplast resin, the sum of the components (I) to (III) being always 100% by weight.