| 摘要 |
PROBLEM TO BE SOLVED: To produce a 1,2-polybutadiene as a thermoplastic elastomer which allows no generation of mold stains, thermal degradation nor change in physical properties with time at high-temperature molding and exerts excellent properties such as moldability, transparency, mechanical strength property, wet skid resistance, and a 1,2-polybutadiene which yields a vulcanized rubber having excellent properties. SOLUTION: A 1,2-butadiene has (i) a 1,2-bond content in a bond unit of butadiene of 70 wt.% or larger, (ii) a melting point within the range of from 50 to 130 deg.C, (iii) a viscosityη, measured by using a slit die rheometer at a shear rate of 5,113 sec-1, of from 400 to 1,200 poise at 120 deg.C, from 300 to 1,000 at 150 deg.C and from 200 to 800 poise at 180 deg.C and (iv) a total halogen content of 30 ppm or smaller.
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