| 摘要 |
The present invention provides a rubber composition in which solution viscosity and cold flow are improved. The rubber composition according to the present invention includes 20 to 90 wt% of a polybutadiene (A) produced by a metallocene catalyst, having: a cis-1,4-structure in microstructure being 65 to 95 mol%, a vinyl-1,2-structure in microstructure being 4 to 30 mol%, and a weight average molecular weight (Mw) being 2x10 5 to 1x10 6 ; and includes 10 to 80 wt% of polybutadiene (B) having: a Mooney viscosity (ML 1+4 , 100°C ) being 60 or less, a 5 wt% of styrene solution viscosity (St-cp) being 20 to 110; and St-cp/ML 1+4 being 1.0 to 2.5, in which a total of the polybutadiene (A) and the polybutadiene (B) is 60 to 100 wt%. |
