Dispersions of crosslinked polymer micro-particles in aqueous media, a process for the preparation of these dispersions, and coating compositions containing these dispersions

US4945128A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Hans-Dieter Hille · Bensberg, DE
• Horst Muller · Cologne, DE
• Arnold Dobbelstein · Cologne, DE

Key dates

• Filing date: Aug 26, 1988
• Grant date: Jul 31, 1990
• Expiry date: Aug 26, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/755
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Dispersions of crosslinked polymer micro-particles in aqueous media, a process for the preparation of these dispersions, and coating compositions containing these dispersions. The invention relates to dispersions of crosslinked polymer micro-particles in aqueous media, which have been prepared: PA0 (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups, preferably carboxylate groups, sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and PA0 (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer micro-particles.