Intrinsically viscous clear powder coating slurry which is free of organic solvents and external emulsifiers, method for producing said slurry and use of the same

US6624238B1 · kind B1 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Gunther Ott · Hachenburg, DE
• Ulrike Rockrath · Senden, DE
• Maximilian Bendix · Hachenburg, DE
• Joachim Woltering · Hachenburg, DE
• Fatmir Raka · Hachenburg, DE
• Ute Schuhmacher · Münster, DE
• Ulrich Poth · Munster, DE

Key dates

• Filing date: Mar 12, 2001
• Grant date: Sep 23, 2003
• Expiry date: Mar 12, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A pseudoplastic powder clearcoat slurry which is free from organic solvents and external emulsifiers and comprises solid spherical particles with an average size of from 0.8 to 20 &mgr;m and a maximum size of 30 &mgr;m, at least one ionic thickener and at least one nonionic associative thickener, the powder clearcoat slurry having an ion-forming group content of from 0.05 to 1 meq/g, a neutralizing agent content of from 0.05 to 1 meq/g, and a viscosity of (i) from 50 to 1 500 mPas at a shear rate of 1 000 s−1, (ii) from 150 to 8 000 mPas at a shear rate of 10 s−1, and (iii) from 180 to 12 000 mPas at a shear rate of 1 s−1.