Process for producing functional siloxanes of controlled structure

US8912290B2 · kind B2 · utility

Assignee

• Momentive Performance Materials GmbH · US

Inventors

• John Huggins · Nevada City, US
• Hubertus Eversheim · Wermelskirchen, DE

Key dates

• Filing date: Apr 9, 2013
• Grant date: Dec 16, 2014
• Expiry date: Apr 9, 2033

Classification

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

Abstract

Disclosed herein is a process for preparing a linear hydroxyaryloxy-functional polydiorganosiloxanes having controlled structures. The process includes the step of reacting a linear α,ω-bisacyloxypolydiorganosiloxane with at least one bisphenolic compound, or hydroxy-functional oligomer thereof, in such a molar ratio that the phenolic groups in the bisphenolic compound or the hydroxy-functional oligomer thereof to the acyloxy groups in the α,ω-bisacyloxypolydiorganosiloxane is less than 2.0. Also disclosed are hydroxyaryloxy-functional polydiorganosiloxanes produced from the process and the polysiloxane/polyorgano block copolymers made using the hydroxyaryloxy-functional siloxanes.