Process for the preparation of sulfur-containing organosilicon compounds

US6384256B1 · 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: C07F7/1892
• 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 10;is disclosed. The process comprises:(A) reacting an alkali metal hydroxide compound, a sulfide compound having the formula M2Sn or MHS,where H is hydrogen, M is ammonium or an alkali metal, n is as defined above, and sulfur in water to form a polysulfide mixture,(B) reacting said polysulfide mixture 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,in the presence of a phase transfer catalyst. The process provides sulfur containing organosilicon compounds based on phase transfer catalysis techniques that result in a final product composition having greater stability, purity, and appearance. The process also minimizes or eliminates hydrogen sulfide as a side product.