Fumed Silanized Silica

• US 20090298982A1
• Filed: 12/05/2006
• Published: 12/03/2009
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: Evonik Operations GmbH (Rag-Stiftung)
• Original Assignee: Evonik Degussa GmbH
• Inventors: Scholz, Mario, Meyer, Jürgen
• Granted Patent: US 8,211,971 B2
• Time in Patent Office: Days
• US Class Current: 524/268
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 33/183 by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane
• CPC Class Codes: C01P 2004/52 highly monodisperse size distribution
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/11 Powder tap density
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/22 Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• CPC Class Codes: C08K 9/06 with silicon-containing compounds
• CPC Class Codes: C09C 1/3081 Treatment with organo-silicon compounds

Abstract

Fumed silanized silica with the following physico-chemical data: Grindometer value less than 20 μm Tamped density 25 to 85 g/l is prepared by grinding fumed silica which has been silanized. It can be used in silicone rubber.

Claims

1. Fumed silanized silica having the following physiochemical data:

2. A process for preparing the fumed silanized silica according to claim 1, comprising silanizing a fumed silica having a BET surface area of 130±

M²/g and then grinding the silanized fumed silica to form ground non-reagglomerating silanized fumed silica.

3. Silicon rubber containing as a filler the fumed silanized silica according to claim 1.

4. Silicone rubber compounds containing 0.5% to 60% by weight of the fumed silanized silica having the following characteristic physicochemical data: