The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 2004
Filed:
Nov. 12, 2002
Chad Aaron Buesing, Midland, MI (US);
John Michael Gohndrone, Midland, MI (US);
Dow Corning Corporation, Midland, MI (US);
Abstract
A process for producing organosilicon compounds of the formula (RO) R Si—Alk—S —Alk—SiR (OR) in which R is a monovalent hydrocarbon having 1-12 carbon atoms, Alk is a divalent hydrocarbon having 1-18 carbon atoms, m is 0, 1 or 2, and n is 2-8, preferably 3-8. The process consists generally of the steps of (I) heating and reacting (A) a sulfide compound such as M S or MHS where H is hydrogen, M is ammonium or an alkali metal, and n is 1-8; with (B) a silane compound of the formula (RO) R Si—Alk—X where X is Cl, Br or I, and m is 0, 1, or 2; and with (C) sulfur. Step (I) is carried out in the presence of a phase transfer catalyst, and an aqueous phase containing a buffer or a basic compound, to form a product mixture. In step (II), the product mixture is again heated to a temperature of 80-100° C., preferably a temperature of 85-95° C., and most preferably to a temperature of 87-92° C., for about 1-3 hours, and the desired organosilicon compound can be obtained by separating it from the resulting product mixture. The result is a composition with improved color.