METHOD FOR DEPOLYMERISATION OF POLYSULPHIDES AND OBTAINING BISMERCAPTODIETHERS Russian patent published in 2016 - IPC C07C319/06 C07C323/10 

FIELD: chemistry.

SUBSTANCE: invention relates to method for obtaining bismercaptodiether of formula HS-R¹-O-C(R²)H-O-R¹-SH, in which R¹ represents linear, branched or cyclic alkylene group, containing from 1 to 6 carbon atoms, or arylene group and R² represents hydrogen atom, linear, branched or cyclic alkyl group, containing from 1 to 6 carbon atoms, or aryl group by interaction of polysulphide with the following structure: R³-S-[S-R¹-O-C(R²)H-O-R¹-S]_n-S-R³ _, in which each R³ is independently selected from alkyl groups, etheralkyl, aryl ad alkaryl groups, containing from 1 to 6 carbon atoms and having terminal -SH and -OH groups, and n is in the interval from 1 to 100, with monothiol of formula R⁴-SH, in which R⁴ represents linear or branched alkyl, aryl or alkaryl group, optionally substituted with heteroatoms, in presence of base, where base has pKa index higher than monothiol pKa index, as determined in water solution at 25°C, as well as to method for polysulphide obtaining.

EFFECT: method makes it possible to obtain bismercaptodiethers without formation of inorganic salts.

14 cl, 1 dwg, 1 tbl, 3 ex