FIELD: chemistry.
SUBSTANCE: invention relates to polybutadiene polymers and rubber compositions. 1,4-polybutadiene polymer is obtained, having content of cis-bonds from 85 to 92 %, content of vinyl bonds from about 1 to about 5 % and content of trans-bonds from about 3 to about 12 %, wherein polymer has enthalpy of fusion ΔHm from about 5 to about 25 J/g °C when DSC differential scanning calorimetry is measured.
EFFECT: invention improves resistance at low temperatures while maintaining strength and wear resistance of rubber compositions.
15 cl, 2 dwg, 4 tbl
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