Precipitated silicas for storage-stable RTV-1 silicone rubber formulations without stabilizer

US9738535B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Christian Panz · Wesseling, DE
• Helga Obladen · Zeven, DE
• Karl Meier · Bornheim, DE
• Markus Ruf · Meckenheim, DE
• Rene Allerdisse · Bornheim, DE
• Dieter Kuhn · Marburg, DE
• Aziz El Moussaoui · Gelnhausen, DE
• Mario Scholz · Zöblitz, DE
• Michael Kempf · Rodenbach, DE

Key dates

• Filing date: Oct 31, 2008
• Grant date: Aug 22, 2017
• Expiry date: Sep 3, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/19
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A precipitated silica having an SiOHisolated absorbance ratio of greater than or equal to 1.5, a silanol group density of 1 to 3.0 SiOH/nm2, a modified tapped density of 1 to 50 g/l, and a pH of 3-5, when measured as a aqueous suspension of 5.00 g of the precipitated silica in 100 ml. of deionized water allows preparation of storage-stable RTV-1 silicone rubber formulations without stabilizer. A process for preparing the precipitated silica and its use in thickening sealants is provided.