Patent ID: 7501534

Claim:
Process for the preparation of an organosilane of the formula I, in which R are identical or different and are a C 1 -C 8 -alkyl group, C 1 -C 8 -alkenyl, C 1 -C 8 -aryl or C 1 -C 8 -aralkyl group or an OR′ group, R′ are identical or different and are a branched or straight-chain monovalent C 1 -C 24 -alkyl or -alkenyl group, an aryl group, an aralkyl group, a hydrogen (—H), an alkyl ether group O—(CR 111 2 ) —O-Alk or 0-(CR III 2 ) y —O-Alk or an alkyl polyether group 0-(CR III 20)y-Alk or 0-(CR 111 2 − CR III 2 -0)y-Alk, where y=2-20, R III , independently of one another, are H or an alkyl group, and Alk is a branched or straight-chain, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic monovalent C 1 -C 20 -hydrocarbon group, R″ is a branched or straight-chain, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C 1 -C30-hydrocarbon group which is optionally substituted by F, C 1 , Br, I, HS, NH 2 or NHR′, X=S if n=2 and m is an average sulphur chain length of from 1.5 to 4.5, and x=SH if n=1 and m=1, by reacting a (haloorganyl)alkoxysilane of the formula 11 in which R, R′ and R″ have the above-mentioned meanings and Hal is chlorine, bromine, fluorine or iodine, in a reaction with a sulphurization reagent selected from the group consisting of alkali metal hydrogen sulphide, metal sulphide Me 2 S, metal polysulphide Me 2 Sg and any desired combinations thereof, where Me=alkali metal, NH 4 or (alkaline earth metal) 1/2 , and g=1.5-8.0, and optionally additionally with sulphur and/or with H 2 S in alcohol, characterized in that the Me 2 S or Me 2 S g contains more than 10% by weight of water and the alkali metal hydrogen sulphide contains more than 3% by weight of water.