Ceramic powder having a surface that has been rendered hydrophobic as well as its manufacture and use

US6156430A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Lothar Weber · Stuttgart, DE
• Ulrich Eisele · Stuttgart, DE
• Ruediger Nass · Riegelsberg, DE

Key dates

• Filing date: Jul 30, 1997
• Grant date: Dec 5, 2000
• Expiry date: Jul 30, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention essentially relates to the use of ceramic powders whose surface has been rendered hydrophobic to produce fine-particle dispersions having a high solids content and a low viscosity. The invention further relates to specific ceramic powders whose surface has been rendered hydrophobic, and methods of producing them. Ceramic powders whose oxidic surface has hydroxide groups possessing a basic or amphoteric character can be rendered hydrophobic, for example, through the effect of a hydrophobic carboxylic acid. Acidic oxides are rendered hydrophobic through treatment with metal-containing hydrophobing agents which are, however, also suitable for rendering ceramic powders hydrophobic that have a basic or amphoteric character.