| 摘要 |
PURPOSE:The titled rubber composition which has lowered rolling resistance without detriment to mechanical properties and wet skid resistance, containing a polybutadiene rubber to which a (thio)benzophenone is introduced, as a rubber component. CONSTITUTION:A tire tread rubber composition containing, as a rubber component, (A) 10-80wt% substantially amorphous polybutadiene rubber to which 0.1mol or above, per mol of the molecular chain, of a (thio)benzophenone, e.g., 4,4'-bis-(dimethylamino)(thio)benzophenone, is introduced and which has a 1,2 bond content of 60-90% and a Mooney viscosity (ML1+4, 100 deg.C) of 20-150, (B) 80-20wt% polyisoprene rubber having a cis-1,4-bond content >=90%, and (C) 0-50wt%, polybutadiene rubber having a 1,2-bond content <=20% and a Mooney viscosity of 20-100.
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