Aqueous copolymers, a process for their preparation and their use in coating compositions

US6531535B2 · kind B2 · utility

Assignee

• Bayer Aktigensellschaft · DE

Inventors

• Martin Melchiors · Leverkusen, DE
• Rolf Bachmann · Busswil, CH
• Wieland Hovestadt · Leichlingen, DE
• Karl-Ludwig Noble · Cologne, DE
• Harald Blum · Wachtendonk, DE

Key dates

• Filing date: Mar 25, 2002
• Grant date: Mar 11, 2003
• Expiry date: Mar 25, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D151/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a hydroxy-functional copolymer P, which is present as a dispersion and/or solution in water, and is obtained by successively carrying out process steps A-D:A) initially introducing a hydrophobic polymer containing hydroxyl groups into a reaction vessel,B) introducing an initiator component into that vessel,C) subsequently polymerizing a hydrophobic monomer mixture containing hydroxyl groups in that vessel andD) subsequently polymerizing a hydrophilic monomer mixture containing hydroxyl and acid groups in that vessel. The present invention also relates to a process for the preparation of copolymers P following the procedure previously set forth and to coating compositions containing these copolymers P and one or more crosslinking agents.