METHOD OF PRODUCING CONJUGATED DIENE POLYMER, CONJUGATED DIENE POLYMER AND RUBBER COMPOSITION

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FIELD : chemistry. SUBSTANCE : described is a method of producing a conjugated diene polymer, involving a polymerisation step where the conjugated diene polymer cointaining 98.5 wt % or more cis-1, 4 bonds and weight-average molecular weight (Mw) to weight-average molecular mass (Mn) (Mw/Mn) ratio equal to less than 2.5, is obtained via a polymerisation reaction in conjugated diene compounds using a catalyst composition containing the following components : (a) a compound which contains a rare-earth element, which contains at least a rare-earth element with atomic number ranging from 57 to 71, or a product of a reaction between a compound which contains a rare-earth element and a Lewis base, component (b) combination of alumoxane and an organoaluminium compound of general formula AlR1R2R3, where R1 and R2 separately denote the same or different carbohydrate group having 1-10 carbon atoms, or a hydrogen atom, and R3 denotes a hydrocarbon group having 1-10 carbon atoms, which is identical or different from R1 and R2, component (c) an iodine-containing compound which contains at least one iodine atom in the structure of the molecule. Described also is a rubber composition which contains the described conjugated diene polymer. EFFECT : obtaining a diene polymer which is characterised by narrow molecular mass distribution and high content of cis-bonds and a rubber composition based on the said polymer, having high breaking strength, high tensile elongation. 9 cl, 5 tbl, 11 ex