Hydrophobic precipitated silica

US6197384A · kind A · utility

Assignee

• Degussa-Huels AG · DE

Inventors

• Jurgen Schubert · Dirmstein, DE
• Wolfgang Lortz · Wächtersbach, DE

Key dates

• Filing date: Jun 25, 1999
• Grant date: Mar 6, 2001
• Expiry date: Jun 25, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2995
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Hydrophobic precipitated silica having the physical/chemical parameters: Drying loass [%] 2.0-10 DIN ISO 787/2 Ignition loss [%] 2-25 DIN ISO 3262/11 Methanol wettability [%] 20-80 titrated Carbon content [%] 1-30 -- is produced by mixing a precipitated silica suspension with a silane emulsion and drying it. The hydrophobic precipitated silica may be used for the production of defoamers and in papermaking.