Abstract: The invention relates to silane-azodicarbonamide mixtures containing 5-95% by weight of azocarbonyl-functionalized silane of formula I based on the total amount of azocarbonyl-functionalized silane of formula I, silane of formula II and azodicarbonamide of formula III, (R1)3-a(R2)aSi—R3—NH—C(O)—N?N—R4 (I), 0-90% by weight of silane of formula II based on the total amount of azocarbonyl-functionalized silane of formula I, silane of formula II and azodicarbonamide compound of formula III, (R1)y(R2)3-y Si—R3—Sx—R3—Si(R1)y(R2)3-y (II) and 1-80% by weight of azodicarbonamide compound of formula III based on the total amount of azocarbonyl-functionalized silane of formula I, silane of formula II and azodicarbonamide compound of formula III, R5—NH—C(O)—N?N—C(O)—NH—R5 (III). The silane-azodicarbonamide mixture is produced by mixing 5-95% by weight of azocarbonyl-functionalized silane of formula I, 0-90% by weight of silane of formula II and 1-80% by weight of azodicarbonamide compound of formula III.

Abstract: A process for preparing polysulfane silanes of formula (I): (R1)3-mR2mSi—R3—Sx—R3—SiR2m(OR1)3-m??(I), may include reacting at least one halosilane of formula (II): (R1)3-mR2mSi—R3-Hal??(II), with M(SH)y and/or MzS and sulfur, in the presence of a phase transfer catalyst, a base and an aqueous phase, wherein the phase transfer catalyst is an alkylguanidinium catalyst of the formula (III): and at least two groups of R4, R5, R6, R7, and R8 are —(CH2)2CH3, —CH2CH3, or —CH3.