Process for preparing organo(poly)siloxanes

US5223595A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Michael Stepp · Braunau am Inn, AT
• Johann Muller · Burghausen, DE
• Silvia Schofberger · Simbach, DE

Key dates

• Filing date: Apr 23, 1992
• Grant date: Jun 29, 1993
• Expiry date: Apr 23, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing organo(poly)siloxanes of the formula EQU R.sup.1 R.sub.2 Si(OSiR.sub.2).sub.m (OSiR.sub.2).sub.n OH which comprises reacting a hexaorganocyclotrisiloxane of the formula EQU (R.sub.2 SiO).sub.3 with a sil(ox)anol of the formula EQU R.sup.1 R.sub.2 Si(OSiR.sub.2).sub.m OH in the presence of a catalyst which contains fluoride ions, in which R is the same or different and represents a monovalent, optionally substituted hydrocarbon radical, R.sup.1 represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical, m is 0 or an integer of at least 1 and n is an integer of at least 3. An alkali metal fluoride or an alkali metal fluoride bonded to a support material is preferably used as the catalyst in the process of this invention.