Surface-modified silicas

US7972431B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Juergen Meyer · Taunusstein, DE
• Mario Scholz · Zöblitz, DE
• Kai Schumacher · Hofheim, DE

Key dates

• Filing date: Sep 11, 2007
• Grant date: Jul 5, 2011
• Expiry date: Dec 21, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/64
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Surface-modified silicas Surface-modified, highly structured, potassium oxide-doped silicas, characterized by BET surface area, m2/g: 25-400 average primary particle size, nm: 5-50 pH: 3-10 carbon content, % by weight: 0.1-10 potassium oxide content, % by weight: 0.000001-40 are prepared by subjecting a potassium oxide-doped silica to surface modification. It can be used as a filler in silicone rubber compositions.