Process for the preparation of silane polysulfides

Details Process for the preparation of silane polysulfides Process for the preparation of silane polysulfides

1994-09-28

1995-11-14

Sweet, Mark

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556428, 525102, C07F 704

Patent

active

054668484

ABSTRACT:
Sulfur-containing organosilicon compounds useful as coupling agents in vulcanizable rubbers to enhance various properties, including low rolling resistance for automobile tires, are prepared. Preferred compounds include .OMEGA., 106 '-bis (trialkoxysilylalkyl) polysulfides. In the preferred process scheme, sodium ethoxylate is reacted with hydrogen sulfide gas to yield sodium sulfide. The sodium sulfide is then reacted with sulfur to form the tetrasulfide. The product of that reaction is then reacted with chloropropyltriethoxysilane to form the compound 3,3'- bis (triethoxysilylpropyl) tetrasulfide. The use of hydrogen sulfide gas and sodium metal alcoholates provides an efficient and economical process.

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Thomas, J. S. and Rule, A. J. Chem. Soc. 103, 871-6: Proc. Chem. Soc. 29, 154-5.

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