Low-silanol silica

US6800413B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Barthel · Herzogenaurach, DE
• Mario Heinemann · Burghausen, DE
• Franz Grünwald · Haiming, DE
• Helmut Maginot · Altötting, DE
• Ute Volkel · Burghausen, DE

Key dates

• Filing date: Sep 9, 2002
• Grant date: Oct 5, 2004
• Expiry date: Dec 5, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A silylated silica having an SiOH density per nm2 of less than 0.6, based on the BET-method surface area (DIN 66131 and 66132), is prepared by silylating silica in a process where loading, reacting, and purifying are performed in separate steps.