公开(公告)号：US10167375B2

公开(公告)日：2019-01-01

申请号：US15501284

申请日：2015-08-07

Applicant: BRIDGESTONE CORPORATION

Inventor： Satoshi Hamatani

IPC: C08L7/00 ,  C08K3/04 ,  B60C1/00 ,  C08L21/00 ,  C09C1/48 ,  C01B32/00

Abstract: Provided is a rubber composition that, when adopted in a tire member such as a tread, displays low heat generation, high abrasion resistance, and high cut resistance, and enables excellent fatigue cracking resistance to be realized. The rubber composition contains carbon black that satisfies relationship formulae (1) to (3), shown below. 62.5×24M4DBP+hydrogen amount of carbon black≤8337.5  (1) 24M4DBP−0.25×CTAB≥62.5  (2) Dst+0.75×ΔD50≥152.5  (3).

公开(公告)号：US11339272B2

公开(公告)日：2022-05-24

申请号：US16464508

申请日：2017-11-29

Applicant: BRIDGESTONE CORPORATION ,  OTSUKA CHEMICAL CO., LTD.

Inventor： Satoshi Hamatani ,  Shinya Shinozaki ,  Mifuyu Ueno ,  Masaki Abe

IPC: C08K5/30 ,  B60C1/00 ,  B60C11/00 ,  C07C243/38 ,  C08K3/04 ,  C08L7/00 ,  C08L9/00

Abstract: An additive for rubber that enables a rubber composition to have excellent low heat generating property and processability, a rubber composition containing the additive for rubber, and a tire using the same are provided. A rubber composition comprises a hydrazone compound represented by the following Formula (I): where R1 and R2 each independently represent a hydrogen atom, an alkyl group with a carbon number of 1 to 16, or an alkenyl group with a carbon number of 2 to 6, and A represents a group represented by the following Formula (A-1) or Formula (A-2):

公开(公告)号：US11168197B2

公开(公告)日：2021-11-09

申请号：US16739776

申请日：2020-01-10

Applicant: BRIDGESTONE CORPORATION

Inventor： Satoshi Hamatani ,  Hidenobu Akahane

IPC: C08K3/04 ,  B60C1/00 ,  C08K3/36

Abstract: A rubber composition that is capable of providing vulcanized rubber excellent in the abrasion resistance without the deterioration of the crack resistance and the low heat generation property is provided. The rubber composition contains: (A) a rubber component; (B) carbon black having a CTAB specific surface area of 110 to 160 m2/g, a half value width ΔD50 of a peak including a Stokes equivalent diameter Dst obtained by a centrifugal sedimentation method of 60 nm or less, and ΔD50/Dst of 0.95 or less; and (C) silica having a CTAB specific surface area of 200 m2/g or more, has a total amount of a content (b) of the carbon black (B) and a content (c) of the silica (C) of 30 to 80 parts by mass per 100 parts by mass of the rubber component (A), and has (b)/(c) of (60 to 85)/(40 to 15).

公开(公告)号：US20200079933A1

公开(公告)日：2020-03-12

申请号：US16683682

申请日：2019-11-14

Applicant: Bridgestone Corporation

Inventor： Aya SAIKI ,  Satoshi Hamatani

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

Abstract: There is provided a rubber composition for a tire excellent in the low heat generating property and abrasion resistance. To achieve the above object, the rubber composition for a tire according to the present disclosure is a rubber composition comprising a rubber component containing a diene rubber, a carbon black, and a silica, and further comprising a carbon black dispersant composed of a compound represented by the formula (I) or the like, and a compound having a Hansen solubility parameter (HSP) of 27 or more.