LOW-SALT METHOD OF PRODUCING POLYSULPHIDE Russian patent published in 2019 - IPC C08G75/00 C08G75/02 C08G75/14 C08G65/00 C08G63/00 C08L81/00 C08L81/02 C07C1/00 C07C321/04 C07C323/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing polysulphide by low-salt method. Method of producing polysulphide involves a step of reacting bis(2-haloalkyl) formal with sodium polysulphide (i) or a combination of sodium and sulfur bisulphide (ii). Reaction is carried out in the presence of a prepolymer of formula (I) X-(R²-O)_n-CH₂-O-(R¹-O)_m-CH₂-(O-R²)_p-X (I), in which R¹ and R² can be identical or different, selected from alkane chains containing 2–10 carbon atoms, X is a halogen atom, n, m and p are integers which can be identical or different and have a value in range from 1 to 6. Reaction is carried out in the absence of a dihaloated alkane.

EFFECT: invention enables to obtain a polysulphide polymer with low salt content, characterized by good chemical resistance, good compatibility with plasticisers and polar surfaces.

11 cl, 8 tbl, 5 ex