Process for the production of silicic acid heteropolycondensates useful as membranes and adsorbents

US4238590A · kind A · utility

Assignee

• FRAUNHOFER-GESELSCHAFT · DE

Inventors

• Horst Scholze · Würzburg, DE
• Helmut Schmidt · Riegelsberg, DE

Key dates

• Filing date: Dec 27, 1978
• Grant date: Dec 9, 1980
• Expiry date: Dec 27, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the production of silicic acid heteropolycondensates, wherein at least one hydrolysable silicic acid derivative; at least one substituted silane; optionally at least one functional silane and/or optionally at least one substantially involatile oxide soluble in the reaction medium or at least one compound forming a substantially involatile oxide are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The polycondensates are useful in the production of membranes and adsorbents.