| 摘要 |
PURPOSE:A high-expansion ratio foam excellent in wet skid performance, mold flow and abrasion resistance, prepared by crosslinking and expanding a rubber composition containing a specified 1,2-polybutadiene, a styrene/butadiene random copolymer and other rubbers. CONSTITUTION:A rubber composition comprising (A) 30-90wt% 1,2-polybutadiene (1,2-bond content >=70wt%, crystallinity >=5%, and intrinsic viscosity in toluene at 30 deg.C>=0.5dl/g), (B) 5-60wt% styrene/butadiene random copolymer (combined styrene content of 3-30wt% and 1,2-bond content of the butadiene portion of 50-95%), and 0-50wt% at least one member selected from among natural rubber, diene rubbers (except the rubber of component B), and aromatic vinyl compound/conjugated diene compound block copolymers is mixed with a crosslinking agent and a blowing agent at about 70-140 deg.C. The obtained mixture is placed in a mold and crosslinked and expanded by heating to about 140- 170 deg.C under an elevated pressure. |
