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：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：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)

公开(公告)号：US20220002524A1

公开(公告)日：2022-01-06

申请号：US17290891

申请日：2019-12-11

Applicant: JSR CORPORATION

Inventor： Keita NAKAGAWA ,  Kazushi URAYAMA ,  Takuya SANO ,  Takato FUKUMOTO

IPC: C08L9/00

Abstract: A polybutadiene composition which enables the achievement of a rubber material that has excellent crack propagation resistance and a method for producing this polybutadiene composition are provided. A polybutadiene composition is produced by a method that comprises a step Y wherein 1,3-butadiene is polymerized in the presence of 1,2-polybutadiene and a lanthanoid catalyst. A polybutadiene composition which contains 1,2-polybutadiene and 1,4-polybutadiene, and which is obtained by polymerizing 1,3-butadiene in the presence of 1,2-polybutadiene and a lanthanoid catalyst.

公开(公告)号：US20200247982A1

公开(公告)日：2020-08-06

申请号：US16845190

申请日：2020-04-10

Applicant: JSR Corporation

Inventor： Takuya SANO ,  Takato FUKUMOTO ,  Takumi ADACHI ,  Naoya HONDA ,  Kunpei KOBAYSHI ,  Jiro UEDA

IPC: C08L9/06 ,  B60C1/00 ,  B60C11/00

Abstract: The present invention has as its object the provision of a polymer composition from which a rubber elastic body having high strength is obtained and in which excellent processability is achieved, and a tire having excellent strength. The polymer composition according to the present invention includes: a polymer (A) having a 1,2-polybutadiene chain (provided that a polymer falling within the definition for the below-described polymer (B) is excluded); and a polymer (B) having a structural unit derived from a conjugated diene compound and a structural unit derived from an aromatic vinyl compound, in which the structural unit derived from a conjugated diene compound contains a structural unit derived from butadiene, and the following mathematical formula (i) is satisfied when the composition ratios of a structural unit represented by the following chemical formula (1), a structural unit represented by the following chemical formula (2), a structural unit represented by the following chemical formula (3) and a structural unit represented by the following chemical formula (4) are p mol %, q mol %, r mol % and s mol %, respectively. 0.70≤[(p+0.5r)/(p+q+0.5r+s)]≤0.99  Mathematical Formula (i)

公开(公告)号：US20200086687A1

公开(公告)日：2020-03-19

申请号：US16542453

申请日：2019-08-16

Applicant: JSR Corporation

Inventor： Koichiro TANI ,  Takuya SANO ,  Takato FUKUMOTO ,  Naoki SUGIYAMA ,  Kunpei KOBAYASHI ,  Takumi ADACHI ,  Jiro UEDA ,  Ryoji TANAKA

IPC: B60C1/00 ,  C08L15/00 ,  C08K9/06 ,  C08K3/36

Abstract: A rubber composition contains: (A) a polymer having a carbon-carbon unsaturated bond and exhibiting a value α of 0.6 or more as obtained by the following formula (i): α=(p+(0.5×r))/(p+q+(0.5×r)+s)  (i) wherein p, q, r, and s are the proportions by mole of structural units represented by the following formulae (1), (2), (3), and (4), respectively in the polymer: and (B) modified silica.

公开(公告)号：US20190218378A1

公开(公告)日：2019-07-18

申请号：US16364857

申请日：2019-03-26

Applicant: JSR Corporation

Inventor： Takumi ADACHI ,  Takuya SANO ,  Takato FUKUMOTO ,  Naoya HONDA ,  Kunpei KOBAYASHI ,  Jiro UEDA

IPC: C08L9/06 ,  C08J3/22 ,  C08J3/24 ,  B60C1/00

CPC classification number: C08L9/06 ,  B60C1/0016 ,  C08J3/226 ,  C08J3/24 ,  C08L9/00 ,  C08L2205/025 ,  C08L2310/00 ,  C08L2312/02

Abstract: Provided is a method that can produce an inexpensive rubber composition capable of providing a rubber elastic body having high strength. A method for producing a rubber composition of the present invention includes steps of: (A) kneading a component containing at least a highly saturated conjugated diene-based polymer and a crosslinking agent component; (B) kneading a component containing at least a conjugated diene-based polymer other than the highly saturated conjugated diene-based polymer; and (C) kneading an intermediate composition (a) obtained in the step (A) and an intermediate composition (b) obtained in the step (B).