Process for the purification of organopolysiloxanes

US5245067A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Otto Schneider · Burghausen, DE
• Johann Schuster · Oberasbach, DE
• Ludwig Hager · Burghausen, DE

Key dates

• Filing date: Jun 29, 1992
• Grant date: Sep 14, 1993
• Expiry date: Jun 29, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/34
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for purifying organopolysiloxanes, which comprises treating organopolysiloxanes after their preparation with an elemental metal. Impurities which are related to the preparation of organopolysiloxanes and cause changes in color, in particular during storage under the influence of heat, subsequent clouding, inhibition of catalysts, a lack of heat stability, a lack of dielectric strength or the formation of odors, especially after exposure to light, are removed by the process of this invention.