Precross-linked silicone elastomer particles with organopolymer shell as formulation constituent in powder coating materials

US5981659A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Michael Geck · Burghausen, DE
• Walter Goeblmeier · Wurmannsquick, DE
• Bernward Deubzer · Burghausen, DE
• Ekkehard Patrick · Altötting, DE

Key dates

• Filing date: Mar 6, 1998
• Grant date: Nov 9, 1999
• Expiry date: Mar 6, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the use of precrosslinked silicone elastomer particles with an organopolymer shell as the formulation constituent in powder coating material compositions based on thermoplastic or thermosetting binding agents, the silicone elastomer particles containing (a) 5 to 95% by weight, in relation the total weight of the copolymerisate, of a nucleus polymer of the general formula (R.sub.w SiO.sub.2/2).sub.x.(RSiO.sub.3/2).sub.y.(SiO.sub.4/2).sub.z with x=5 to 99.5 mol %, y=0.5 to 95 mol %, z=0 to 30 mol %, and (b) 5 to 95% by weight, in relation to the total weight of the copolymer, of a shell made of an organopolymer of ethylenically mono or multi-unsaturated monomers, R standing for identical or different monovalent C.sub.1 -C.sub.6 alkyl or alkenyl residues or substituted hydrocarbon residues.