US 12,479,982 B2
Cross-linked product and tire
Takumi Adachi, Minato-ku (JP); Yuto Sakagami, Minato-ku (JP); Hirofumi Senga, Minato-ku (JP); Takuya Sano, Minato-ku (JP); Takato Fukumoto, Minato-ku (JP); Michitaka Kaizu, Minato-ku (JP); Toshimitsu Kikuchi, Minato-ku (JP); and Toshiyuki Hayakawa, Minato-ku (JP)
Assigned to ENEOS MATERIALS CORPORATION, Tokyo (JP)
Appl. No. 17/438,080
Filed by ENEOS MATERIALS CORPORATION, Tokyo (JP)
PCT Filed Mar. 30, 2020, PCT No. PCT/JP2020/014611
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/203984, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-070194 (JP), filed on Apr. 1, 2019.
Prior Publication US 2022/0251351 A1, Aug. 11, 2022
Int. Cl. C08L 15/00 (2006.01); B60C 1/00 (2006.01); C08C 19/02 (2006.01); C08C 19/22 (2006.01); C08C 19/25 (2006.01); C08F 236/10 (2006.01); C08J 3/24 (2006.01); C08K 3/013 (2018.01); C08K 3/06 (2006.01); C08K 3/36 (2006.01); C08L 9/00 (2006.01); C08L 9/06 (2006.01)
CPC C08L 15/00 (2013.01) [B60C 1/0016 (2013.01); B60C 1/0025 (2013.01); C08C 19/02 (2013.01); C08C 19/22 (2013.01); C08C 19/25 (2013.01); C08F 236/10 (2013.01); C08J 3/24 (2013.01); C08K 3/013 (2018.01); C08K 3/06 (2013.01); C08K 3/36 (2013.01); C08L 9/00 (2013.01); C08L 9/06 (2013.01)] 20 Claims
 
1. A cross-linked product, obtained by a process comprising crosslinking a polymer composition that comprises a rubber component, an inorganic filler, and a cross-linking agent,
wherein the rubber component comprises a conjugated diene-based polymer (A) having a value α in a range of from 0.80 to 0.97, where a is calculated by formula (i);
α=(p+(0.5×r))/(p+q+(0.5×r)+s)  (i),
p is a molar ratio of a structural unit of formula (1);

OG Complex Work Unit Chemistry
q is a molar ratio of a structural unit of formula (2);

OG Complex Work Unit Chemistry
r is a molar ratio of a structural unit of formula (3);

OG Complex Work Unit Chemistry
and
s is a molar ratio of a structural unit of formula (4);

OG Complex Work Unit Chemistry
in the conjugated diene-based polymer (A),
wherein a blending ratio of the conjugated diene-based polymer (A) is 10% by mass or more, relative to a total amount of the rubber component,
wherein a blending ratio of the inorganic filler is in a range of from 50 to 150 parts by mass, relative to 100 parts by mass of the rubber component,
wherein the cross-linked product has a glass transition point, Tg, of −25° C. or lower,
wherein the conjugated diene-based polymer (A) is a random copolymer of a conjugated diene compound and an aromatic vinyl compound,
wherein the conjugated diene-based polymer (A) has a content ratio of a structural unit derived from the aromatic vinyl compound in a range of from 3 to 20% by mass, relative to a total monomer unit amount of the conjugated diene-based polymer, and
wherein the conjugated diene-based polymer (A) has a 1,2-vinyl bond content in a range of from 5 to 28 mol % before hydrogenation.