METHOD FOR PRODUCING BRANCHED POLYDIENE Russian patent published in 2024 - IPC C08F2/06 C08F4/52 C08F4/54 C08F36/04 C08F36/06 C08F8/00 C08L9/00 C08K3/01 

FIELD: production of synthetic rubbers.

SUBSTANCE: invention relates to the production of synthetic rubbers used in the manufacture of tires and tire parts, rubber products, golf balls and other similar products. In particular, the present invention relates to a method for producing branched polydiene by polymerization of conjugated diene in a hydrocarbon solvent medium in the presence of a catalytic system comprising a lanthanide compound, an organoaluminium compound, conjugated diene and a halogen-containing component, by introducing a branching agent at the end of polymerization, selected from a group of chlorine-containing compounds consisting of methylene trichloride, dimethylene dichloride, ethylene trichloride, diethylol dichloride, n-butylol trichloride, di-n-butylol dichloride, phenylolol trichloride, diphenylol dichloride, 2,4,6-trichloro-2,4,6-tri(phenoxy)-1,3,5-triase-2,4,6-triphosphorine, hexachlorocyclotriphosphazene or mixtures thereof, or compounds containing at least two maleic fragments, wherein the hydrocarbon solvent is a mixture of an aliphatic solvent (A) selected from heptane, nephras or cycloaliphatic solvents - cyclohexane, cycloheptan - or mixtures thereof, and low-boiling hydrocarbons C5-C6 (B) taken in the mass ratio (A):(B)=(80-91):(9-20)%. In addition, the present invention relates to branched polydiene obtained by the method described above, as well as to a rubber compound for rubber products based on the specified polydiene.

EFFECT: technical result of the invention consists in increasing the productivity of the polydiene production process, reducing the dynamic viscosity of the polymerizate solution, improving recyclability, increasing the branching index of the polymer, characterized by a decrease in the tangent of the angle of mechanical losses tgδ (1200%), reducing cold flow and improving elastoplastic properties.

19 cl, 3 tbl, 24 ex