Patent ID: 6680398
Filing Date: 2004-01-20
Classification: C07F

Abstract:
A process for making mercaptoalkylalkoxysilanes comprising the sequential steps of:first, mixing (i) a pH adjusting agent and (ii) a sulfide containing compound of the formula M2Sn or MHS where M is an alkali metal or an ammonium group and H is hydrogen, in an aqueous phase, to provide a pH in the range of 4-9 of the aqueous phase, second, adding (iii) a phase transfer catalyst to the aqueous phase, third, adding (iv) a haloalkylalkoxysilane to the aqueous phase, to form a reaction mixture containing mercaptoalkylalkoxysilanes and water soluble byproducts, and fourth, separating the desired mercaptoalklyalkoxysilanes from the water soluble byproducts.