Process for the preparation of sulfur-containing organosilicon compounds

US6384255B1 · kind B1 · utility

Assignee

• Dow Corning Corporation · US

Inventors

• Michael Backer · Mainz, DE
• Howard M. Bank · Freeland, US
• John Gohndrone · Midland, US
• William Charles Maki · Midland, US
• Charles E. Skinner · Midland, US
• Anil Kumar Tomar · Midland, US
• Hongjun Yue · Midland, US

Key dates

• Filing date: Jun 29, 2001
• Grant date: May 7, 2002
• Expiry date: Jun 29, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/1804
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the production of organosilicon compounds of the formula(RO)3−mRmSi—Alk—Sn—Alk—SiRm(OR)3−mwhere R is independently a monovalent hydrocarbon of 1 to 12 carbon atoms,Alk is a divalent hydrocarbon of 1 to 18 carbon atoms;m is an integer of 0 to 2, n is a number from 1 to 8 is disclosed. The process comprises:(A) reacting sulfur, a phase transfer catalyst, a sulfide compound having the formula M2Sn or MHS,where H is hydrogen, M is ammonium or an alkali metal, n is the same as above, and water to form an intermediate reaction product;(B) reacting said intermediate reaction product with a silane compound of the formula;(RO)3−mRmSi—Alk—X where X is Cl, Br or I, and m is the same as above.The invention provides an improvement process characterized by adding the phase transfer catalyst to the aqueous phase prior to mixing the aqueous phase with the silane compound for the reaction.