Silicon dioxide which bears partially or fully silylated polysilicic acid chains on its surface

US6183867A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Barthel · Herzogenaurach, DE
• Mario Heinemann · Burghausen, DE

Key dates

• Filing date: Dec 16, 1998
• Grant date: Feb 6, 2001
• Expiry date: Dec 16, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to silicon dioxide which bears partially or fully silylated polysilicic acid chains on its surface, wherein the sum of silanol groups of the silicon dioxide surface (SiOH) and grafted-on silylating agent radicals (SiR.sub.a) is greater than the number of silanol groups on the surface of untreated silicon dioxide, where a can be 1, 2 or 3 and R can be identical or different and are each a substituted or unsubstituted hydrocarbon radical.