Spherical colored polyester particles, process for their preparation, and their use for powder coatings

US6261690A · kind A · utility

Assignee

• Aventis R search & Technology GmbH & Co. KG · DE

Inventors

• Karsten Blatter · Lechenich, DE
• Peter Simon · Marburg, DE

Key dates

• Filing date: Aug 13, 1999
• Grant date: Jul 17, 2001
• Expiry date: Aug 13, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to homogeneously colored polyester particles having a mean particle size <50 .mu.m and a monomodal particle size distribution with a span (=d90-d10/d50).ltoreq.2.5, which can be melted at temperatures <200.degree. C. to form a continuous coating, to a process for their preparation and to their use for powder coatings. In a preferred embodiment the particles comprise units of formulae (1) and (2) EQU --CO--X--CO (1) EQU --O--D--O-- (2) where PA1 X is a substituted or unsubstituted C.sub.6 to C.sub.14 aromatic radical or an alkylene, polymethylene, cycloalkane or dimethylene-cycloalkane group or a straight-chain or branched, saturated or unsaturated alkanediyl group and PA1 D is an alkylene, polymethylene, cycloalkane or dimethylene-cycloalkane group or a straight-chain or branched, saturated or unsaturated alkanediyl group.