Process for producing a multi-layer coating using aqueous coating compound aqueous coating compounds

US5275847A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Stephan Schwarte · Münster, DE
• Ulrich Poth · Munster, DE

Key dates

• Filing date: Jan 29, 1993
• Grant date: Jan 4, 1994
• Expiry date: Jan 29, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L61/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the production of a multi-layered coating in which the aqueous top coating composition contains a water-dilutable polyacrylate resin which has a hydroxyl number of 40 to 200, an acid number of 20 to 100 and a glass transition temperature (T.sub.G) of -40.degree. C. to +60.degree. C. and can be prepared by adding a mixture (I) of a (meth)acrylic acid ester and a copolymerizable monomer containing hydroxyl groups to an organic solvent, subjecting the mixture to free radical polymerization and, when the addition of mixture (I) has ended, adding a monomer containing carboxyl groups and polymerizing the mixture further.