Process for the preparation of silane polysulfides

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

1995-02-02

1996-02-06

Sweet, Mark D.

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

Organic compounds

Silicon containing

556428, C08F 708

Patent

active

054897017

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.,.OMEGA.'-bis (trialkoxysilylalkyl) polysulfides. The compounds are prepared by reacting sodium ethoxylate with hydrogen sulfide gas to yield a sodium sulfide solution, and then reacting this product with a slurried mixture of elemental sulfur and 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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