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公开(公告)号：US20200231779A1
公开(公告)日：2020-07-23
申请号：US16641525
申请日：2018-08-27
Applicant: BRIDGESTONE CORPORATION
Inventor： Seiichi TAHARA
Abstract: An object of the present disclosure is to provide: a rubber composition having excellent low hysteresis loss properties and snow-gripping capability without lowering the wet-gripping capability; and a tire using the rubber composition. To achieve the object, a rubber composition of the present disclosure has: a rubber component including therein 50 mass % or more of a natural rubber, and a modified styrene-butadiene rubber which contains 1 mass % to 20 mass % of styrene; a resin having a glass transition temperature (Tg) higher than 0° C.; and a low-temperature plasticizer having a glass transition temperature (Tg) lower than −50° C.
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2.发明申请公开(公告)号：US20220251447A1
公开(公告)日：2022-08-11
申请号：US17596280
申请日：2020-06-11
Applicant: BRIDGESTONE CORPORATION
Inventor： Atsushi FUKUSHIMA , Hiroshi KANNO , Seiichi TAHARA , Takahiro MIURA , Tomohiro URATA
Abstract: Provided is an anti oxidant supply composition that enables replenishment of a rubber article with anti oxidant without taking a long time. An anti oxidant supply composition comprises: a base material and 5 mass % or more of anti oxidant, wherein a solubility parameter (SP value) of the base material is less than 7.8 (cal/cm3)1/2.
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公开(公告)号：US20250091882A1
公开(公告)日：2025-03-20
申请号：US18832709
申请日：2023-01-17
Applicant: ENEOS Corporation , Bridgestone Corporation
Inventor： Masahide KOBAYASHI , Naoko URUSHIZAKO , Rina IWAMOTO , Ryoji IDA , Masahiro HOJO , Seiichi TAHARA , Akira OKUNO , Marino KUNO ITODA
IPC: C01B32/90 , B01J21/12 , B01J23/883 , B01J23/888 , B01J37/02 , B01J37/08 , C10B53/07 , C10G69/06
Abstract: Provided is a method for producing chemical products and carbides, including: a pyrolysis step of obtaining a first gas fraction, a pyrolysis oil, and a residual fraction by pyrolysis of a crushed material of waste tires; a carbide recovery step of recovering a carbide from the residual fraction; a hydrogenolysis step of obtaining a second gas fraction, a light fraction, and a heavy fraction by hydrogenolysis of a raw material oil containing at least a part of the pyrolysis oil; and a steam-cracking step of obtaining a chemical product and a raw material for producing a carbide by steam cracking of a steam-cracking raw material oil containing at least a part of the light fraction.
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公开(公告)号：US20190264010A1
公开(公告)日：2019-08-29
申请号：US16343518
申请日：2017-10-12
Applicant: BRIDGESTONE CORPORATION
Inventor： Tomohiro URATA , Seiichi TAHARA
Abstract: Provided is a rubber composition in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. Also provided is a tire in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. The rubber composition comprises a rubber component, a petroleum wax, and an antidegradant, wherein the petroleum wax comprises a C20-C34 hydrocarbon component and a C35 or higher hydrocarbon component, and a proportion of the C20-C34 hydrocarbon component is 15% by mass to 30% by mass and a proportion of the C35 or higher hydrocarbon component is 70% by mass to 85% by mass, based on a total mass of the C20-C34 hydrocarbon component and the C35 or higher hydrocarbon component.
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公开(公告)号：US20190225775A1
公开(公告)日：2019-07-25
申请号：US16336218
申请日：2017-09-21
Applicant: BRIDGESTONE CORPORATION
Inventor： Seiichi TAHARA
Abstract: A rubber composition allows suppression of cracking and discoloration of a tire surface. The rubber composition includes a rubber component (A), a quinoline age resistor (B) including a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline, and N-phenyl-N′-(1,3-dimethylbutyl)-p-phenylenediamine (C). The content ratio of the quinoline age resistor (B) is 0.1 mass % to 1.5 mass % in terms of the total amount of the rubber composition. The total content ratio of dimers and trimers of the 2,2,4-trimethyl-1,2-dihydroquinoline in the quinoline age resistor (B) is 60 mass % or more.
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Patent Agency Ranking
公开(公告)号：US20180345737A1
公开(公告)日：2018-12-06
申请号：US15779602
申请日：2016-12-02
Applicant: BRIDGESTONE CORPORATION
Inventor： Seiichi TAHARA , Shinichi MUSHA , Tomohiro URATA , Tatsuya NOMOTO
CPC classification number: B29D30/72 , B29D2030/726 , B60C1/00 , B60C1/0025 , B60C13/00
Abstract: Provided is a tire on which cracks on sidewall portion outer surfaces are unlikely to progress. The tire comprises a depthwise part I from a point on a sidewall portion outer surface to 0.5 mm on at least a part of a sidewall portion, wherein: the depthwise part I satisfies the following requirement: the depthwise part I: comprising a natural rubber, a butadiene rubber, and a thermoplastic elastomer; a peak temperature T1 (° C.) of tan δ is −20° C. or more and −5° C. or less; and when tan δ at the peak temperature T1 (° C.) is α1 and a storage modulus at the peak temperature T1 (° C.) is E′1 (MPa), α1≤0.90 and E′1≥MPa.
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公开(公告)号：US20250145897A1
公开(公告)日：2025-05-08
申请号：US18832682
申请日：2023-01-17
Applicant: ENEOS Corporation , Bridgestone Corporation
Inventor： Masahide KOBAYASHI , Naoko URUSHIZAKO , Rina IWAMOTO , Ryoji IDA , Masahiro HOJO , Seiichi TAHARA , Akira OKUNO , Marino KUNO ITODA
Abstract: Provided is a method for producing chemical products, including: a pyrolysis step of obtaining a first gas fraction, a pyrolysis oil, and a residual fraction by pyrolysis of a crushed material of a waste material including waste tires; a hydrogenolysis step of obtaining a second gas fraction, a light fraction with a boiling point of 350° C. or lower, and a heavy fraction with a boiling point higher than 350° C. by hydrogenolysis of a raw material oil containing at least a part of the pyrolysis oil; and a steam-cracking step of obtaining a chemical product by steam cracking of a steam-cracking raw material oil containing at least a part of the light fraction.
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公开(公告)号：US20200377696A1
公开(公告)日：2020-12-03
申请号：US16759799
申请日：2018-10-31
Applicant: BRIDGESTONE CORPORATION
Inventor： Seiichi TAHARA
Abstract: An object of the present disclosure is to provide a rubber composition capable of achieving both dry performance and wet performance at the same time without deteriorating a low loss property of a tire, and a solution thereof is a rubber composition including: a rubber component (A) including a natural rubber (A1), a synthetic rubber (A2) having a glass transition temperature (Tg) of −50° C. or less, and a synthetic rubber (A3) having a glass transition temperature (Tg) of more than −50° C.; and a thermoplastic resin (B) containing an aromatic monomer, with a content of the natural rubber (A1) in the rubber component (A) being 40% by mass or more, and a content of the thermoplastic resin (B) containing an aromatic monomer being 10 to 50 parts by mass based on 100 parts by mass of the rubber component (A).
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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
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.
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公开(公告)号：US20200307133A1
公开(公告)日：2020-10-01
申请号：US15779597
申请日：2016-12-02
Applicant: BRIDGESTONE CORPORATION
Inventor： Seiichi TAHARA , Shinichi MUSHA , Tomohiro URATA , Tatsuya NOMOTO
Abstract: Provided is a tire on which cracks on sidewall portion outer surfaces are unlikely to progress. The tire comprises a depthwise structure on at least a part of a sidewall portion, the depthwise structure comprising, in a depth direction from a point on a sidewall portion outer surface, a depthwise part from the sidewall portion outer surface to 0.5 mm and a depthwise part II from 0.5 mm to 1.0 mm, wherein: the depthwise part I and the depthwise part II satisfy: the depthwise part I: peak temperature T1 of tan δ is −20° C. or more and −5° C. or less, and when tang at the peak temperature T1 is α1 and storage modulus at the peak temperature T1 is E′1, α1≤0.90 and E′1≥5 MPa; and the depthwise part II: when tan δ at peak temperature T1 is α2, and storage modulus at peak temperature T1 is E′2, α2
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