Surface-modified, pyrogenically prepared silicas

US8512595B2 · 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: Jul 1, 2008
• Grant date: Aug 20, 2013
• Expiry date: Apr 21, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles having a BET surface area of 300±25 m2/g and the aggregates have an average area of 4800-6000 nm2, an average equivalent circle diameter (ECD) of 60-80 nm and an average circumference of 580-750 nm, to surface-modification in a known way.It can be used as a filler for controlling the rheology of liquid silicone rubber (LSR) systems.