Method for preparing linear organopolysiloxanediols

US4762937A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Ralph Ottlinger · Rosenheim, DE
• Rudolf Reitmeier · Burghausen, DE

Key dates

• Filing date: Aug 6, 1987
• Grant date: Aug 9, 1988
• Expiry date: Aug 6, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Linear organopolysiloxanediols are prepared by continuously introducing cyclic organopolysiloxanes, water in an amount of at least 14 mols per gram atom of silicon contained in the cyclic organopolysiloxanes used and water-soluble acid into a recirculating reactor and thereafter separating the aqueous phase from the organopolysiloxanediols more or less immediately after the reaction mixture exits from the recirculating reactor.