| 摘要 |
Provided is a rubber composition for shoe soles prepared by blending 100 mass parts of a polymer component comprising 10 to 90 mass % of a vinyl/cis-polybutadiene rubber (A) comprising 1,4-cis-polybutadiene (a) and 1,2-polybutadiene crystalline fibers (b) in which the crystalline fibers have an average fiber length of 200 nm or less and an average aspect ratio of 10 or less, in which the number of the crystalline fibers having a fiber length of 200 nm or less is 90 fibers or more per 25 µm 2 and in which a melting point is 170°C or higher, 10 to 50 mass % of a diene base rubber (B) other than the polybutadiene rubber (A) and 2 to 50 mass % of a thermoplastic polymer (C) with 2 to 50 mass parts of a rubber reinforcing material (D). The above rubber composition for shoe soles has a light weight and an appropriate hardness and is excellent in a tensile strength, a tear strength, an abrasion resistance and a gripping property and excellent as well in a dimensional stability after foaming, and it is suited as an outsole for shoes. |
