公开(公告)号：US20220098380A1

公开(公告)日：2022-03-31

申请号：US17479492

申请日：2021-09-20

Applicant: JSR CORPORATION

Inventor： Toshimitsu KIKUCHI ,  Hirofumi SENGA ,  Yuto SAKAGAMI ,  Takuya SANO ,  Takato FUKUMOTO ,  Toshiyuki HAYAKAWA

IPC: C08J9/00 ,  C08L9/06 ,  C08J9/18 ,  B60C1/00

Abstract: A polymer composition includes a conjugated diene polymer (A) and a compound (B). The compound (B) is at least one compound selected from the group consisting of a polysiloxane compound and a fluorine-containing compound. The conjugated diene polymer (A) contains, when the composition ratios (molar ratios) in the polymer of the structural units represented by formulas (1) to (4) are p, q, r, and s, respectively, a polymer (A-1) satisfying formula (i). 0.75≤(p+(0.5×r))/(p+q+(0.5×r)+s)≤0.95  Formula (i):

公开(公告)号：US20210238396A1

公开(公告)日：2021-08-05

申请号：US17161688

申请日：2021-01-29

Applicant: JSR CORPORATION

Inventor： Toshimitsu KIKUCHI ,  Takuya SANO ,  Hirofumi SENGA ,  Yuto Sakagami ,  Takato FUKUMOTO ,  Toshiyuki HAYAKAWA

IPC: C08L9/06 ,  B60C1/00 ,  C08K5/00

Abstract: There is provided a polymer composition using which a molded product having excellent balance between rigidity, wear resistance, viscoelastic properties, and heat resistance can be obtained.
A polymer composition according to the disclosure includes (A) a conjugated diene rubber (where, a polymer corresponding to the following component (B) is excluded); and (B) a hydrogenated product of a polymer that satisfies the following (1) to (3), which is a polymer in which 80% or more of structural units derived from butadiene are hydrogenated: (1) being a copolymer of a conjugated diene compound containing butadiene and an aromatic vinyl compound, (2) including a polybutadiene block having a vinyl group content of 20% or less, and (3) including a block composed of a conjugated diene compound and an aromatic vinyl compound.

公开(公告)号：US20220153971A1

公开(公告)日：2022-05-19

申请号：US17438699

申请日：2020-03-27

Applicant: JSR CORPORATION

Inventor： Takumi ADACHI ,  Hirofumi SENGA ,  Michitaka KAIZU ,  Toshimitsu KIKUCHI ,  Takuya SANO

IPC: C08L15/00 ,  C08C19/22 ,  C08C19/02 ,  C08C19/25 ,  C08K3/36 ,  B60C1/00

Abstract: A hydrogenated conjugated diene-based polymer which has a structure formed by bonding a nitrogen-containing compound having two or more alkoxysilyl groups and two or more nitrogen atoms with a plurality of conjugated diene-based polymer chains, wherein: when a composition ratio (molar ratio) in the hydrogenated conjugated diene-based polymer of each of a structural unit represented by formula (1), a structural unit represented by formula (2), a structural unit represented by formula (3), and a structural unit represented by formula (4) is p, q, r, and s, respectively, a value a represented by formula (i) is 0.80 or more and 0.97 or less, and an equilibrium storage modulus E′ of the hydrogenated conjugated diene-based polymer is 2.4 MPa or more, α=(p+(0.5×xr))/(p+q+(0.5×xr)+s) . . .(i)