Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Horst Zeizinger

Mario Scholz

Juergen Meyer

Uwe Ellenbrand

Jürgen Meyer

Manfred Ettlinger

Hans-Dieter Christian

The present invention relates to a hydrophobic, fumed silica which is obtained by reacting fumed silicas with cyclic polysiloxanes of the type &#x2014;[O&#x2014;SiR]&#x2014;, where R is a Cto Calkyl 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.

Hydrophobic fumed silica and silicone rubber materials containing the fumed silica

The present invention relates to a hydrophobic, fumed silica which is obtained by milling a fumed silica which has fixed dimethylsilyl and/or monomethylsilyl groups on the surface due to silanization; 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.

A surface-modified, aerogel-type, structured silica is produced by spraying an aerogel-type, structured silica with a silanizing agent, post-mixing and conditioning. It can be used as a flatting agent.

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Hanau, Germany

Horst Zeizinger