METHOD FOR OBTAINING A CATALYST FOR ISOPRENE POLYMERIZATION Russian patent published in 2018 - IPC C08F4/54 

FIELD: chemistry.

SUBSTANCE: invention relates to processes for preparation of isoprene polymerization catalyst and can find application in the production of general-purpose rubbers in the synthetic rubber industry. Method for preparation of a catalyst for the polymerization of isoprene by reacting, in a hydrocarbon solvent, catalyst components comprising a salt of rare earth metals and organophosphorus acid, alkylaluminum, alkylaluminum halide and conjugated diene, followed by keeping the mixture at room temperature, consisting in the use of a mixture of organophosphoric acid salts of gadolinium and neodymium as a salt of rare earth metals and organophosphorus acid, in molar ratio Gd:Nd=0.25–0.75:0.75–0.25, and the process is carried out at a molar ratio of rare earth metal : aluminum : chlorine : diene, equal to 1:7–9:2.5–3.0:10–50.

EFFECT: proposed method of synthesis allows to obtain a highly efficient polymerization catalyst for isoprene (95–99 % yield of polyisoprene) not requiring the use of large amounts of organoaluminum compounds and leading to the production of polyisoprene with a high content of cis-1,4-links 98½–99 %.

3 cl, 7 ex