Process for preparing methylhydrogenpolysiloxanes having trimethylsilyl end groups

US6143912A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Tassilo Lindner · Mehring, DE
• Gilbert Geisberger · Altötting, DE
• Bernd Pachaly · Schweich, DE

Key dates

• Filing date: May 25, 1999
• Grant date: Nov 7, 2000
• Expiry date: May 25, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing methylhydrogenpolysiloxanes having trimethylsilyl end groups wherein, in a first step, methyldichlorosilane and trimethylchlorosilane are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolysate and gaseous hydrogen chloride and, in a second step, the partial hydrolysate, to remove the SiCl groups still present, is treated with water, forming hydrochloric acid.