Precipitated silica paste

US5256196A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Marian Chjonowski · Offenbach, DE
• Werner Nagel · Alzenau, DE
• Karl Meier · Bornheim, DE
• Wolfgang Leonhardt · Frankfurt, DE
• Heinz Esch · Wesseling, DE

Key dates

• Filing date: Dec 18, 1991
• Grant date: Oct 26, 1993
• Expiry date: Dec 18, 2011

Classification

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

Abstract

A precipitated silica paste is produced by dispersing precipitated silica in silicon oil. During the hydrophobing of precipitated silicas, the precipitated silica paste is added as a hydrophobing agent in the suspension phase. The product is spray-dried, tempered and ground.