METHOD FOR PREPARING POLYSULFIDE POLYMERS Russian patent published in 2003 - IPC

FIELD: polymers, chemical technology. SUBSTANCE: invention relates to method for preparing liquid and solid polysulfide polymers. Liquid polysulfide polymers are prepared for a single stage by the following manner: to mixture of chlorine-containing monomers of di-(β-chloroethyl)-formal and 1,2,3-trichloropropane taken in the mole ratio = (0.999:0.001)-(0.970:0.030) sulfide compound is added in sequence in the amount 0.3-4.5 mole per 1 mole of chlorine-containing monomers by its complete or batch- operated feeding and then alkaline metal hydrosulfide 18-32% an aqueous solution in the amount 3.0-3.5 mole as measured for alkaline metal hydrosulfide per 1 mole of mixture of chlorine-containing monomers is added at temperature 70-98 C for 0.5-2.0 h at intensive stirring. Prepared reaction mixture is hold at intensive stirring at temperature 80-98 C for 5.0-5.5 h and after reaction termination the end product is isolated from mixture. Solid polysulfide polymers are prepared by above indicated method using chlorine-containing monomer of di-(β-chloroethyl)formal or mixture of chlorine-containing monomers of di-(β-chloroethyl)formal and 1,2,3-trichloropropane and with addition of magnesium hydroxide also as 5-20% an aqueous solution as measured per 1 mole of chlorine-containing monomer or mixture of chlorine-containing monomers, respectively. Invention provides preparing polysulfide polymers for a single stage, with enhanced and reproducible values of viscosity, to improve polymer quality (transparency, weak colorability). EFFECT: improved preparing method. 16 cl, 9 ex