MODIFIED POLYMER OF CONJUGATED DIENE, RUBBER COMPOSITION AND TYRE

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FIELD : chemistry. SUBSTANCE : modified polymer is obtained via polymerisation of a conjugated diene compound in the presence of a catalyst which contains a compound of a lanthanide rare-earth element in an organic solvent, followed by modification of the obtained polymer which contains an active organometallic centre with a modifier which contains a functional group capable of a substitution or addition reaction, wherein the degree of modification is not less than 15% and content of cis-1, 4-links in the conjugated diene part, measured via Fourier-transform infrared spectroscopy satisfies the relationship (I) : content of cis-1, 4-links ≥98.00 (%)…(1), or the degree of modification is not less than 75% and content of cis-1, 4-links in the conjugated diene part, measured via Fourier-transform infrared spectroscopy, satisfies the relationship (II) : 94.00 (%) ≤content of cis-1, 4-links <98.00 (%)…(II). EFFECT : modified polymer has high rate of modification, provides a rubber composition which contains a modified polymer of a conjugated diene, from which a tyre with low heat generation, satisfactory damage chacteristics and high wear-resistance is obtained. 32 cl, 1 dwg, 13 tbl, 29 ex