Process for the preparation of sulfur-containing organosilicon compounds

US6448426B1 · 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: Sep 10, 2002
• Expiry date: Jun 29, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/548
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved 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—Xwhere X is Cl, Br or I, and m is the same as above(C) separating the organosilicon compound from the product mixture by adding water or a dilute acidic solution to the product mixture, and phase separating the product mixture into an organic phase containing the organosilicon compound and an aqueous phase.