Hydrophobic filler mixtures, process for its production and use

US4307023A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Manfred Ettlinger · Karlstein, DE
• Karl-Hans Muller · Bruchköbel, DE
• Edgar Simon · Alzenau, DE

Key dates

• Filing date: Jul 3, 1980
• Grant date: Dec 22, 1981
• Expiry date: Jul 3, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K9/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

There is produced a hydrophobic mixture for RTV and LTV silicone rubber by applying a hydrophobizing agent to a precipitated silica, homogeneously mixing this powdery concentrate into a pyrogenically produced silica, tempering the mixture and mechanically compacting. The hydrophobic filler mixture obtained in the untempered condition consists of: PA0 Pyrogenically produced silica: 50 to 85 weight % PA0 Precipitated silica: 5 to 40 weight % (e.g. 5 to 30 weight %) PA0 Hydrophobization agent: 8 to 30 weight % PA0 Aluminum oxide: 0.5 to 5 weight %.