US 12,129,325 B2
Hydrogenated block copolymer
Yuya Sonoda, Tokyo (JP); Takahiro Tsuji, Tokyo (JP); Katsunori Nitta, Tokyo (JP); and Tatsuya Hisatomi, Tokyo (JP)
Assigned to Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
Appl. No. 17/439,866
Filed by Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
PCT Filed Mar. 13, 2020, PCT No. PCT/JP2020/011123
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2020/189559, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-053676 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0185937 A1, Jun. 16, 2022
Int. Cl. C08F 297/04 (2006.01); C08L 23/00 (2006.01); C08L 53/02 (2006.01)
CPC C08F 297/04 (2013.01) [C08L 23/00 (2013.01); C08L 53/02 (2013.01)] 15 Claims
 
1. A hydrogenated block copolymer that is a hydrogenated product of a copolymer comprising a vinyl aromatic compound monomer unit and a conjugated diene monomer unit, and that satisfies the following conditions (1) to (5):
(1) the hydrogenated block copolymer comprises at least one of the following polymer blocks (b) and (c):
a hydrogenated copolymer block (b) comprising a vinyl aromatic compound monomer unit and a conjugated diene monomer unit; and
a hydrogenated polymer block (c) principally comprising a conjugated diene monomer unit;
(2) the hydrogenated block copolymer has elongation at break measured in accordance with JIS K 6251 of 1000% or more;
(3) the hydrogenated block copolymer has at least one peak of tan δ in a viscoelasticity measurement chart at −25° C. or more and 80° C. or less;
(4) total content of a vinyl aromatic compound monomer unit adjacent to a conjugated diene monomer unit is 1 to 13% by mass; and
(5) the hydrogenated block polymer comprises at one or more ends, a hydrogenated copolymer block including any one of structures of the following formulas (i) to (iii), wherein a content of the hydrogenated polymer block (c) is 0 to 10% by mass and a content of a polymer block (a) is 0 to 2% by mass in the one end:
[Structure at one end]
(b)-  (i);
(c-b)-  (ii); and
(a-b)-  (iii),
wherein a represents the polymer block (a) principally comprising a vinyl aromatic compound monomer unit, b represents the hydrogenated copolymer block (b) comprising a vinyl aromatic compound monomer unit and a conjugated diene monomer unit, and c represents the hydrogenated polymer block (c) principally comprising a conjugated diene monomer unit.