BigPatents India

The invention relates to a process for the manufacture of organic disulphides and polysulphides. According to the invention, an organic disulphide or polysulphide of formula R-Sp-R, in which p>2 is prepared by reacting sulphur with a mercaptan of formula R-SH or a polysulphide of lower sulphur order to convert it into polysulphide of higher order, or reacting a mercaptan with an organic polysulphide of high sulphur order to convert it into polysulphide of lower sulphur order, in the presence, as catalyst, of a resin based on polystyrene-divinylbenzene (PS-DVB) functionalized with ethylenediamine or polyethylenepolyamine groups of the specified formula. The process according to the invention provides an improved degree of conversion of the reactants and/or a faster reaction rate when compared with the prior art.