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).