Hydrophobic fumed silica and silicone rubber materials containing the fumed silica

US8293834B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Juergen Meyer · Taunusstein, DE
• Horst Zeizinger · Hanau, DE
• Mario Scholz · Zöblitz, DE
• Uwe Ellenbrand · Bad Bederkesa, DE

Key dates

• Filing date: May 6, 2008
• Grant date: Oct 23, 2012
• Expiry date: Nov 28, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a hydrophobic, fumed silica which is obtained by reacting fumed silicas with cyclic polysiloxanes of the type —[O—SiR2]n—, where R is a C1 to C6 alkyl group and n is 3 to 9, and subsequently milling the silanized silicas obtained, and to a process for the preparation of the silica according to the invention, and to silicone rubber materials containing the silica according to the invention.