Patent ID: 6465672
Filing Date: 2002-10-15
Classification: C07F

Abstract:
A process for the production of organosilylalkyl polysulfanes of the general formula (R1R2R3SiR4)2Sx (I), in which:R1, R2, R3, are identical to or different from one another, and are branched or unbranched alkyl and/or alkoxy groups with a chain length of 1-8 carbon atoms, or aryl radicals, and wherein at least one alkoxy group is present; R4 is a divalent alkylene radical with a chain length of 1-8 C atoms, or -(CH2)n-C6H4-(CH2)2-, where n=1-4; and x is a number greater than 1; said process comprising reacting an organosilylalkyl halide of the general formula R1R2R3SiR4X (II), in which R1, R2, R3 and R4 have the meanings given above, and X is chlorine, bromine or iodine, with: a) an anhydrous or virtually anhydrous ionic sulfide of the general formula M+2S2âˆ’ (III), in which M+ denotes an alkali metal cation, an ammonium ion, an alkaline earth metal cation or a zinc cation; and b) elementary sulfur; wherein the elementary sulfur and organosilylalkyl halide are placed in a polar organic solvent and the anhydrous or virtually anhydrous ionic sulfide is added to this suspension.