| abstract |
PROBLEM TO BE SOLVED: To provide a 1,4-polybutadiene rubber composition useful at a low temperature. The 1,4-polybutadiene incorporated into this composition has a cis content of at least 85-about 92%, a vinyl content of about 1% to about 5%, and a trans of about 3 to about 12%. The 1,4-polybutadiene, including content, has a melt enthalpy ΔHm of about 5-5 J / g ° C. as measured by differential scanning calorimetry (DSC). [Selection diagram] Fig. 1 |