Abstract: Mixtures are disclosed of bis(silylorganyl)polysulfanes and silylorganylthiocyanates, which are produced by reacting polysulfanes with cyanides. The inorganic thiocyanate formed is subsequently allowed to react with a haloalkylalkoxysilane to form the silylorganylthiocyanate. These substances are used in plastic and rubber mixtures reinforced with silica and optionally carbon black.

Abstract: The preparation of high-purity organosilicon disulphanes in which, in a two-stage process, elemental sulphur and an anhydrous alkali sulphide in a deficient amount is first reacted with a halogen alkylalkoxysilane, and the sulphur deficit is then made up by the addition of further alkali sulphide.

Abstract: There are prepared compounds of the formula[R.sub.n.sup.1 (R.sup.2 O).sub.3-n --Si--Alk--S--].sub.x Z (I)whereZ is .tbd.PO, .tbd.PS, .tbd.P, .dbd.PR, --P(R).sub.2, --P(OR).sub.2, .dbd.P(OR), --PO(OR).sub.2, --PS(OR).sub.2, .dbd.PO(OR) or .dbd.PS(OR) where R is an alkyl group of 1 to 5 carbon atoms, phenyl or o-, m- or p-nitrophenyl;Alk is an alkylene group with 2 to 4 carbon atoms;R.sup.1 is an alkyl group having 1 to 5 carbon atoms, benzyl or phenyl;R.sup.2 is an alkyl group having 1 to 5 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, phenyl, benzyl or 2-methoxyethyl, each R.sup.1 and R.sup.2 can have the same or different meanings;n is 0, 1 or 2; and,x is 1, 2 or 3, being the residual valence of Z.The compounds are useful as reinforcing agents in vulcanizable rubber mixtures which contain a silicate filler and optionally carbon black.

Abstract: There are prepared compounds of the formula[R.sub.n.sup.1 (R.sup.2 O).sub.3-n -- Si -- Alk -- S -- ].sub.x Z (I)whereZ is .tbd.PO, .tbd.PS, .tbd.P, .dbd.PR, --P(R).sub.2, --P(OR).sub.2, .dbd.P(OR), --PO(OR).sub.2, --PS(OR).sub.2, .dbd.PO(OR) or .dbd.PS(OR) where R is an alkyl group of 1 to 5 carbon atoms, phenyl or o-, m- or p-nitrophenyl;Alk is an alkylene group with 2 to 4 carbon atoms;R.sup.1 is an alkyl group having 1 to 5 carbon atoms, benzyl or phenyl;R.sup.2 is an alkyl group having 1 to 5 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, phenyl, benzyl or 2-methoxyethyl, each R.sup.1 and R.sup.2 can have the same or different meanings;N is 0, 1 or 2; and,X is 1, 2 or 3, being the residual valence of Z.The compounds are useful as reinforcing agents in vulcanizable rubber mixtures which contain a silicate filler and optionally carbon black.