Process for preparing organically modified aerogels and use thereof

US6159539A · kind A · utility

Assignee

• Hoescht Aktiengesellschaft · DE

Inventors

• Fritz Schwertfeger · Griesheim, DE
• Andreas Zimmermann · Griesheim, DE

Key dates

• Filing date: Jan 8, 1998
• Grant date: Dec 12, 2000
• Expiry date: Jan 8, 2018

Classification

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

Abstract

The inventive process concerns the preparation of organically modified aerogels and their use. The process the invention comprises: PA1 a) introducing a siliceous lyogel or hydrogel, PA1 b) optionally subjecting the gel prepared in a) to complete or partial solvent exchange with an organic solvent, PA1 c) reacting the gel obtained in step a) or b) with at least one silylation agent, PA1 d) optionally washing the silylated gel obtained in step c) with an organic solvent, and PA1 e) drying the gel obtained in step c) or d) subcritically, which comprises reacting in step c) the gel obtained in step a) or b) with at least one chlorine-free silylation agent.