CPC C08L 9/06 (2013.01) [B60C 1/0016 (2013.01); B60C 11/0008 (2013.01); C08L 15/00 (2013.01); B60C 2011/0025 (2013.01); C08L 2205/02 (2013.01); C08L 2312/00 (2013.01)] | 9 Claims |
1. A polymer composition comprising:
a diene-based polymer (A); and
a filler (B),
wherein the diene-based polymer (A) contains a polymer (A1) and a polymer (A2),
polymer (A1): a diene-based polymer that is a polymer of a conjugate diene compound or a copolymer of a conjugate diene compound and an aromatic vinyl compound, the diene-based polymer being modified with a polar group having affinity for the filler (B), in which an aromatic vinyl content is 25 mass % or less, and a modification rate is 30-100%, and
polymer (A2): a diene-based polymer that is a copolymer of an aromatic vinyl compound and a conjugate diene compound containing 1,3-butadiene, in which an aromatic vinyl content is 30-50 mass %, a vinyl content is 5-30 mass %, and a peak molecular weight in terms of polystyrene measured by gel permeation chromatography is 400,000 to 2,000,000, and
a ratio of a weight-average molecular weight to a number-average molecular weight of the polymer (A2) is 1.5 to 3.0.
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