PREPARATION OF SULFUR-CONTAINING ORGANOSILICON COMPOUNDS USING A BUFFERED PHASE TRANSFER CATALYSIS PROCESS

WIPO Patent Application WO2003002573

A3

A process for the production of sulfur containing organosilicon compounds of the formula: (RO)3-mRmSi-Alk-Sn-Alk-SiRm(OR)3-m where R is independently a monovalent hydrocarbon of 1 to 12 carbon atoms; Alk is a divalent hydrocarbon of 1 to 18 carbons atoms; man is an integer of 0 to 2, n is a number from 1 to 8; based on phase transfer catalysis techniques is disclosed. The process comprises reacting: (A) 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, with (B) 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, and optionally, (C) sulfur in the presence of a phase transfer catalyst and an aqueous phase containing a buffer. The improvement of the present invention is characterized by adding a buffer to the aqueous phase, which minimizes or prevents gelling of the sulfur containing organosilicon compounds. The present invention also teaches a process for the production of sulfur containing organosilicon compounds by controlling the pH of the aqueous phase.

BACKER MICHAEL WOLFGANG (GB)
BANK HOWARD MARVIN (US)
GOHNDRONE JOHN MICHAEL (US)
MAKI WILLIAM CHARLES (US)
SKINNER CHARLES EDMUND (US)
TOMAR ANIL KUMAR (US)
YUE HONGGJUN (US)

PCT/US2002/015162

September 02, 2004

May 13, 2002

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DOW CORNING (US)
BACKER MICHAEL WOLFGANG (GB)
BANK HOWARD MARVIN (US)
GOHNDRONE JOHN MICHAEL (US)
MAKI WILLIAM CHARLES (US)
SKINNER CHARLES EDMUND (US)
TOMAR ANIL KUMAR (US)
YUE HONGGJUN (US)

C07F7/18; C07B61/00; (IPC1-7): C07F7/18

US5468893A	1995-11-21
US6172251B1	2001-01-09
US5663396A	1997-09-02
US5405985A	1995-04-11
US5583245A	1996-12-10

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