公开(公告)号：US20200307315A1

公开(公告)日：2020-10-01

申请号：US16900186

申请日：2020-06-12

Applicant: BRIDGESTONE CORPORATION

Inventor： Misa AOKI ,  Seiichi TAHARA ,  Takuya OGASAWARA

IPC: B60C1/00 ,  B29D30/06

Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more.

公开(公告)号：US20200032037A1

公开(公告)日：2020-01-30

申请号：US16603003

申请日：2018-04-02

Applicant: BRIDGESTONE CORPORATION

Inventor： Kosuke TAKANO ,  Takuya OGASAWARA ,  Takanori TSUJI

IPC: C08L15/00 ,  C08L7/00 ,  B60C1/00 ,  B60C11/00

Abstract: Provided is a rubber composition capable of highly achieving all of wet performance, low rolling resistance, and steering stability on a dry road surface of a tire, A rubber composition comprises: a rubber component (A) containing natural rubber (A1) and a modified conjugated diene-based polymer (A2); and a thermoplastic resin (B), wherein a content of the natural rubber (A1) in the rubber component (A) is 30 mass % or more, and the modified conjugated diene-based polymer (A2) has a weight-average molecular weight of 20×104 or more and 300×104 or less, contains 0.25 mass % or more and 30 mass % or less of a modified conjugated diene-based polymer having a molecular weight of 200×104 or more and 500×104 or less with respect to a total amount of the modified conjugated diene-based polymer (A2), and has a contracting factor (g′) of less than 0.64.

公开(公告)号：US20200017662A1

公开(公告)日：2020-01-16

申请号：US16336247

申请日：2017-09-21

Applicant: BRIDGESTONE CORPORATION

Inventor： Takuya OGASAWARA ,  Takanori TSUJI

IPC: C08L7/00 ,  C08L25/06 ,  C08L15/00 ,  C08L57/02 ,  C08J7/12 ,  B60C1/00

Abstract: The present disclosure provides a rubber composition that can improve the steering stability and the wet performance of a tire while reducing the rolling resistance of the tire. The rubber composition includes a rubber component (A) including a natural rubber (A1) and a modified diene rubber (A2) having a glass transition temperature (Tg) of −50° C. or lower, and a thermoplastic resin (B). The storage modulus of the rubber composition at 30° C. under 1% strain (E′30° C., 1%) is 4.5 MPa or more, and the storage modulus of the rubber composition at 0° C. under 4% strain (E′0° C., 4%) is 16.7 MPa or less.

公开(公告)号：US20190211191A1

公开(公告)日：2019-07-11

申请号：US16336234

申请日：2017-09-21

Applicant: BRIDGESTONE CORPORATION

Inventor： Takuya OGASAWARA ,  Takanori TSUJI

IPC: C08L7/00 ,  C08L9/00 ,  C08L23/20 ,  C08K3/36 ,  B60C1/00 ,  C08L45/00

CPC classification number: C08L7/00 ,  B60C1/00 ,  B60C1/0016 ,  C08K3/36 ,  C08K7/26 ,  C08K2201/006 ,  C08L9/00 ,  C08L15/00 ,  C08L23/20 ,  C08L45/00 ,  C08L57/02 ,  C08L65/00 ,  C08L2205/03 ,  Y02T10/862

Abstract: The present disclosure provides a rubber composition that can improve the steering stability and the wet performance of a tire while reducing the rolling resistance of the tire. The rubber composition includes a rubber component (A) including a natural rubber (A1) and a modified diene rubber (A2) having a glass transition temperature (Tg) of −50° C. or lower, a thermoplastic resin (B), and a silica (C) such that the specific surface area by cetyltrimethylammonium bromide adsorption (CTAB) (m2/g) and the ink bottle-shaped micropore index (IB) satisfy IB≤−0.36×CTAB+86.8 (Expression Y). The amount of the thermoplastic resin (B) is 10 to 50 parts by mass per 100 parts by mass of the rubber component (A).