Process for the continuous preparation of polydiorganosiloxanes

US4128568A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Buchner · Leverkusen, DE
• Bruno Degen · Much, DE
• Ludwig Fries · Leverkusen, DE
• Judat Helmut · Langenfeld, DE
• Rudolf Mundil · Leverkusen, DE
• Karl-Heinz Rudolph · Bottrop, DE

Key dates

• Filing date: Feb 2, 1978
• Grant date: Dec 5, 1978
• Expiry date: Feb 2, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polymeric organosiloxanes comprising reacting diorganosiloxanes with substances regulating the chain length in the presence of alkaline and/or acid reaction catalysts and wherein the polymerization takes place in a reactor consisting of several zones and is provided with stirring or conveying elements, the arrangement of the stirring or conveying elements being such that the flow of material produced by the stirring or conveying element in each zone is the opposite of that in the adjacent zone or zones.