Process for preparing organopolysiloxanes

US10125225B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Frank Sandmeyer · Altötting, DE
• Georg Loessel · Emmerting, DE
• Marko Prasse · Radewitz, DE

Key dates

• Filing date: Jul 21, 2016
• Grant date: Nov 13, 2018
• Expiry date: Jul 21, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Multistep continuous and semicontinuous hydrolysis and condensation of chlorosilanes with alcohol containing minimal water in a column in a first step to form a silicone resin intermediate, followed by further condensation provides silicone resins in reproducible fashion substantially free of hydrogen chloride, without reactor gelatin.