Process for preparing organopolysiloxanes and copolymers thereof

US4413104A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Bernward Deubzer · Burghausen, DE
• Norbert Egerter · Emmerting, DE
• Volker Frey · Burghausen, DE

Key dates

• Filing date: Dec 18, 1981
• Grant date: Nov 1, 1983
• Expiry date: Dec 18, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/22
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing organopolysiloxanes having SiC-bonded organofunctional groups, which comprises reacting an organopolysiloxane containing SiC-bonded hydroxyl and/or alkoxy groups and having an average of about 0.85 to 1.8 SiC-bonded monovalent hydrocarbon radicals or halogenated monovalent hydrocarbon radicals for each Si atom, with an organosilicon compound containing alkoxy groups and/or siloxane oxygen groups and at least one SiC-bonded organofunctional radical per molecule in the presence of an organic solvent and a basic catalyst. The resultant organopolysiloxanes having SiC-bonded organofunctional groups may, for example, be used for preparing modified polymers by copolymerizing the organopolysiloxanes with a monomer containing an aliphatic double bond, such as styrene or hydroxyethyl methacrylate, or by reacting the organopolysiloxanes with an additional polymer such as an epoxy resin. When a monomer, containing an aliphatic double bond is used in the copolymerization, the resultant modified polymers may be used to manufacture hard contact lenses.