Process for coating heat resistant substrates with two component stoving compositions

US5304400A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf Dhein · Krefeld, DE
• Knud Reuter · Krefeld, DE
• Burkhard Kohler · Leverkusen, DE
• Rainer Rettig · Amagasaki, JP
• Lothar Backer · Gräfenhainichen, DE

Key dates

• Filing date: Jan 15, 1992
• Grant date: Apr 19, 1994
• Expiry date: Jan 15, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/29
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing a coated, heat resistant substrate by PA0 I) coating the substrate with a coating composition containing PA1 a) a solution or dispersion containing PA2 a1) 100 parts by weight of at least one hydroxyl-functional polyacrylate resin in dissolved or dispersed form, wherein the resin has a hydroxyl value of 15 to 200 mg KOH/G solid resin, an acid value of 5 to 250 mg KOH/G solid resin and a total content of chemically incorporated carboxylate and/or sulfonate groups of 8 to 450 milliequivalents per 100 g of solids, PA2 a2) 25 to 395 parts by weight of water and PA2 a3) 5 to 125 parts by weight of at least one organic solvent having a boiling point or boiling range at 1013 mbar of 100 to 300.degree. C. and PA1 b) at least one organic polyisocyanate in a quantity corresponding to an equivalent ratio of isocyanate groups of component b) to isocyanate-reactive groups of component a1) of 0.7:1 to 3:1, and PA0 II) curing the coating composition at a temperature of 40 to The present invention is also directed to the coated substrates obtained by this process.