US 11,746,216 B2
Polymer composition, crosslinked polymer, and tire
Kanyou Shin, Tokyo (JP); Junji Kawai, Tokyo (JP); and Noriko Mashimo, Tokyo (JP)
Assigned to ENEOS Materials Corporation, Tokyo (JP)
Appl. No. 17/286,815
Filed by ENEOS Materials Corporation, Tokyo (JP)
PCT Filed Oct. 24, 2019, PCT No. PCT/JP2019/041630
§ 371(c)(1), (2) Date Apr. 19, 2021,
PCT Pub. No. WO2020/085416, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 2018-200843 (JP), filed on Oct. 25, 2018.
Prior Publication US 2021/0371629 A1, Dec. 2, 2021
Int. Cl. C08L 9/06 (2006.01); B60C 1/00 (2006.01); B60C 11/00 (2006.01); C08L 15/00 (2006.01)
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.