Coating agents for coating aluminum

US5525656A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Peter Heiling · Burghausen, DE
• Dieter Gorzel · Burghausen, DE
• Peter Tschirner · Emmerting, DE

Key dates

• Filing date: Aug 3, 1994
• Grant date: Jun 11, 1996
• Expiry date: Aug 3, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F218/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a coating composition for coating aluminum which is based on vinyl ester copolymers and an organic solvent, the vinyl ester copolymer comprising a) 20 to 90 parts by weight of a vinyl ester of saturated aliphatic monocarboxylic acids having 1 to 5 C atoms, b) 0 to 70 parts by weight of a vinyl ester of saturated aliphatic monocarboxylic acids which have 9 to 10 C atoms and a quaternary C atom in the .alpha.-position relative to the carboxyl group, c) 0.05 to 10 parts by weight of one or more ethylenically unsaturated mono- or dicarboxylic acids having 3 to 10 C atoms or anhydrides thereof and d) 0 to 50 parts by weight of one or more ethylenically unsaturated monomers, the homopolymers of which have a glass transition temperature above 30.degree. C. The coating composition is free of chlorine-containing polymers and also avoids the necessity for using a chlorine-containing primer.