RUBBER COMPOSITION CONTAINING MODIFIED POLYBUTADIENE RUBBER AND TYRE BASED ON SAID COMPOSITION

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FIELD : chemistry. SUBSTANCE : rubber composition contains a rubber component and technical carbon. The rubber component contains modified polybutadiene rubber, natural rubber and/or at least one diene-based synthetic rubber. The modified polybutadiene rubber has content of cis-1, 4 bonds equal to or greater than 92%, content of vinyl bonds equal to or less than 1.5% and 20% or more modified chain ends. The modified polybutadiene rubber is obtained via polymerisation of 1, 3-butadiene in an organic solvent using a catalyst containing a compound having a rare-earth element of the lanthanoid family, and a modifier containing a nitrogen atom, an oxygen atom and/or a sulphur atom. The technical carbon has nitrogen adsorption specific surface area from 20 to 90 m2/g per 100 pts.wt rubber component. The rubber composition is used to produce tyre side walls. EFFECT : tyre made from the rubber composition has low heat build-up and high rupture resistance. 15 cl, 11 ex, 2 tbl