| 摘要 |
PROBLEM TO BE SOLVED: To provide a vinyl-cis-polybutadiene capable of easily adjusting HI high and linearity of a molecule low, and of stable production.SOLUTION: A vinyl-cis-polybutadiene has a boiling n-hexane insoluble part (HI) of 9 to 23 mass%, a long chain branch index (LCB Index) of 1.50 to 5.95, and a ratio (T/ML) of a 5 wt.% toluene solution viscosity of the boiling n-hexane insoluble part (T) to a Mooney viscosity at 100°C (ML)) is 2.07 or less. |
