POLYMER COMPOSITION HAVING HIGH FLOW PROPERTY
A polymer composition having a high flow property is obtained by incorporating 1 to 200 parts by weight of a filler and up to 200 parts by weight of a process oil into 100 parts by weight of a polymer component consisting of at least one polybutadiene having a 1,2-addition unit content of 70 percent or higher, a crystallinity of 5 to 50 percent, and an intrinsic viscosity [ eta ] (as measured in toluene at 30 DEG C.) of 0.7 dl/g or higher, or a polymer component consisting of a major amount of at least one said polybutadiene and a minor amount of a rubbery polymer co-vulcanizable therewith.