Title: Sulfur and phosphorus containing organosilicon compounds and process for their production and use

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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) where Z 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.


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