Aqueous dispersion of hydrophobized silicon dioxide powder comprising a dispersing agent

US7645335B2 · kind B2 · utility

Assignees

• Degussa AG · DE
• GOLDSCHMIDT HOLDING GMBH · DE

Inventors

• Wolfgang Lortz · Wächtersbach, DE
• Christoph Batz-Sohn · Hanau, DE
• Gabriele Perlet · Großkrotzenburg, DE
• Werner Will · Gelnhausen, DE
• Kathrin Lehmann · Leverkusen, DE
• Angela Ruttgerodt

Key dates

• Filing date: Mar 26, 2004
• Grant date: Jan 12, 2010
• Expiry date: Aug 18, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/90
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous dispersion which comprises hydrophobized silicon dioxide powder with a content of between 5 and 50 wt. % and which comprises at least one compound of the general formula R & supl; —COO—(CH2-CH(Ph)—O)a-(CnH2n-xR2x-O)b-R3 (I). It is prepared by dispersing the hydrophobic silicon dioxide powder, dispersing agent and optionally pH-regulating substances and further additives in an aqueous medium. It can be employed as an additive to waterborne fillers in the automobile industry, as a coating constituent in can and coil coating processes, as an additive in water-based UV-curable formulations e.g. for wood preservation and as a constituent of protective lacquer films.