Patents by Inventor Seiichi Tahara

Seiichi Tahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11512185
    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 with respect to a total mass of the styrene-alkylene block copolymer, and the rubber component contains a styrene butadiene rubber having a styrene content of 30 mass % or more.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: November 29, 2022
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Misa Aoki, Seiichi Tahara
  • Publication number: 20220251447
    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.
    Type: Application
    Filed: June 11, 2020
    Publication date: August 11, 2022
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Atsushi FUKUSHIMA, Hiroshi KANNO, Seiichi TAHARA, Takahiro MIURA, Tomohiro URATA
  • Publication number: 20200377696
    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).
    Type: Application
    Filed: October 31, 2018
    Publication date: December 3, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Seiichi TAHARA
  • Publication number: 20200308376
    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 with respect to a total mass of the styrene-alkylene block copolymer, and the rubber component contains a styrene butadiene rubber having a styrene content of 30 mass % or more.
    Type: Application
    Filed: June 12, 2020
    Publication date: October 1, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Misa Aoki, Seiichi Tahara
  • Publication number: 20200307315
    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.
    Type: Application
    Filed: June 12, 2020
    Publication date: October 1, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Misa AOKI, Seiichi TAHARA, Takuya OGASAWARA
  • Publication number: 20200307133
    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 ? is ?20° C. or more and ?5° C. or less, and when tang at the peak temperature T1 is ?1 and storage modulus at the peak temperature T1 is E?1, ?1?0.90 and E?1?5 MPa; and the depthwise part II: when tan ? at peak temperature T1 is ?2, and storage modulus at peak temperature T1 is E?2, ?2<?1 and E?2<E?1.
    Type: Application
    Filed: December 2, 2016
    Publication date: October 1, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Seiichi TAHARA, Shinichi MUSHA, Tomohiro URATA, Tatsuya NOMOTO
  • Publication number: 20200231779
    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.
    Type: Application
    Filed: August 27, 2018
    Publication date: July 23, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Seiichi TAHARA
  • Publication number: 20200190293
    Abstract: An object of the present disclosure is to provide a rubber composition having satisfactorily low hysteresis loss, while maintaining high wear resistance. In order to achieve the object, a rubber composition contains: a rubber component having diene-based rubber therein; and a tetrazine compound.
    Type: Application
    Filed: April 4, 2018
    Publication date: June 18, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takumi TODA, Kenta ISHIBASHI, Hidenobu AKAHANE, Seiichi TAHARA, Ryota SONE
  • Patent number: 10662319
    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.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: May 26, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tomohiro Urata, Seiichi Tahara
  • Publication number: 20190264010
    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.
    Type: Application
    Filed: October 12, 2017
    Publication date: August 29, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tomohiro URATA, Seiichi TAHARA
  • Publication number: 20190225775
    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.
    Type: Application
    Filed: September 21, 2017
    Publication date: July 25, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Seiichi TAHARA
  • Publication number: 20180345737
    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 ? is ?20° C. or more and ?5° C. or less; and when tan ? at the peak temperature T1 (° C.) is ?1 and a storage modulus at the peak temperature T1 (° C.) is E?1 (MPa), ?1?0.90 and E?1?MPa.
    Type: Application
    Filed: December 2, 2016
    Publication date: December 6, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Seiichi TAHARA, Shinichi MUSHA, Tomohiro URATA, Tatsuya NOMOTO
  • Publication number: 20130302606
    Abstract: The present invention aims to provide a steel cord-rubber composite that is, even when a rubber composition constituting coating rubber does not contain cobalt salt, excellent in adhesion to a steel cord and capable of suppressing a decrease in modulus. The steel cord-rubber composite according to the present invention is constituted by using the steel cord coated with a rubber composition containing organic acid metal salt containing 10 mass % or less of free acid.
    Type: Application
    Filed: January 18, 2012
    Publication date: November 14, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Seiichi Tahara