Patents by Inventor Satoshi Mihara

Satoshi Mihara 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).

  • Publication number: 20210047501
    Abstract: The present technology provide a rubber composition including: 100 parts by mass of a diene rubber, from 30 to 100 parts by mass of carbon black and/or a white filler, from 1 to 20 parts by mass of silicone-based microparticles that have an average particle size from 5 to 500 um and that are three-dimensionally crosslinked, from 0.1 to 10 parts by mass of a nonionic surfactant, and from 1 to 20 parts by mass of thermally expanding microcapsules.
    Type: Application
    Filed: March 11, 2019
    Publication date: February 18, 2021
    Inventors: Hirokazu Kageyama, Kazushi Kimura, Satoshi Mihara, Yutaro Yamamoto
  • Publication number: 20210023880
    Abstract: A rubber composition for a tire according to an embodiment of the present technology includes: 100 parts by mass of a diene rubber and from 1 to 30 parts by mass of a thermally expandable microcapsule composite body, and the thermally expandable microcapsule composite body contains one or more thermally expandable microcapsules and an acrylonitrile butadiene copolymer and/or a crosslinked body thereof covering the one or more thermally expandable microcapsules.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 28, 2021
    Inventors: Hirokazu Kageyama, Kazushi Kimura, Satoshi Mihara, Yutaro Yamamoto
  • Publication number: 20200325310
    Abstract: A rubber composition for a tire contains a diene rubber, silica, and a specific modified butadiene polymer, wherein the diene rubber contains an aromatic vinyl-conjugated diene rubber A and at least one rubber component B selected from an aromatic vinyl-conjugated diene rubber b1 other than the rubber A and a butadiene rubber b2 having a weight average molecular weight of ?15000. A content of the aromatic vinyl-conjugated diene rubber A is from 30 to 90% by mass, and a content of the rubber component B is from 10 to 70% by mass, an average TG of the diene rubber is lower than ?20° C., a content of the silica is from 80 to 200 parts by mass per 100 parts by mass of the diene rubber, and a content of the modified butadiene polymer is from 1.0 to 25.0% by mass with respect to content of the silica.
    Type: Application
    Filed: October 4, 2018
    Publication date: October 15, 2020
    Inventors: Ayaki KAZARIYA, Makoto ASHIURA, Satoshi MIHARA, Kazuya UENISHI, Yu SHINKE
  • Publication number: 20200316995
    Abstract: The present technology provides a tire rubber composition formed by blending a microparticle composite, which is formed from a solid component of a mixture containing an emulsion of an organic microparticle and a rubber latex, in a sulfur vulcanizable rubber; the emulsion of the organic microparticle being an emulsion containing a microparticle obtained by polymerizing and/or crosslinking at least one selected from the group consisting of polymerizable monomers, and oligomers, prepolymers, and polymers having a reactive functional group and having a molecular weight from 500 to 50000 simultaneously or stepwise in water; and an average particle size of the microparticle being from 0.001 to 100 ?m.
    Type: Application
    Filed: May 19, 2016
    Publication date: October 8, 2020
    Inventors: Hirokazu Kageyama, Kazushi Kimura, Genichiro Shimada, Satoshi Mihara
  • Patent number: 10781300
    Abstract: Provided is a rubber composition containing from 1 to 50 parts by mass of an organic microparticle having an average particle size of 0.001 to 100 ?m and having a crosslinked structure per 100 parts by mass of a diene rubber, the organic microparticle being a crosslinked microparticle of a copolymer formed from at least two types of segments having repeating units that are different each other, the at least two types of segments being formed from an oligomer or prepolymer having a functional group and having a molecular weight of 500 to 20000, and the functional group forming a crosslinked structure between the at least two types of segments.
    Type: Grant
    Filed: February 9, 2017
    Date of Patent: September 22, 2020
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Kazushi Kimura, Satoshi Mihara, Hirokazu Kageyama
  • Publication number: 20200270420
    Abstract: The present invention provides a rubber composition for a tire, the rubber composition containing: a diene rubber; silica; and a heterocyclic compound (where, the heterocyclic compound does not have a silicon atom) having a hydrocarbon group having from 3 to 30 carbons and at least one type of heterocycle selected from the group consisting of a piperazine ring, a morpholine ring, and a thiomorpholine ring; an average glass transition temperature of the diene rubber being ?50° C. or higher; a content of the silica being from 80 to 200 parts by mass per 100 parts by mass of the diene rubber; and a content of the heterocyclic compound being from 0.5 to 20% by mass with respect to the content of the silica. Such rubber composition has excellent processability, exhibits excellent wet grip performance and has low rolling resistance when the rubber composition is formed into a tire.
    Type: Application
    Filed: September 10, 2018
    Publication date: August 27, 2020
    Inventors: Ayaki KAZARIYA, Makoto ASHIURA, Satoshi MIHARA, Kazushi KIMURA, Hirokazu KAGEYAMA
  • Patent number: 10710407
    Abstract: The present invention provides: a rubber composition for tires which has excellent processability and has excellent low heat build-up when formed into a tire; and a pneumatic tire using the same. The rubber composition for tires of the present invention is a rubber composition for tires, the rubber composition containing a diene rubber (A) and a microparticle (B), a vinyl group content of the diene rubber (A) being from 5 to 35 mass %, the microparticle (B) being a mercapto group-containing organic microparticle in which a crosslinkable oligomer or polymer (b1) is crosslinked, an average particle size of the microparticle (B) being from 1 to 200 ?m, and a content of the microparticle (B) being from 1 to 55 parts by mass per 100 parts by mass of the diene rubber (A).
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: July 14, 2020
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Satoshi Mihara, Kazushi Kimura, Hirokazu Kageyama
  • Patent number: 10589576
    Abstract: A studded tire includes stud pins embedded in a road contact surface of a tread portion 1; the rubber composition forming the tread portion containing at least one of natural rubber, styrene-butadiene rubber, and butadiene rubber, from 5 to 50 parts by weight of carbon black and from 5 to 70 parts by weight of silica per 100 parts by weight of the diene rubber; a nitrogen adsorption specific surface area of the carbon black being from 50 to 120 m2/g; a CTAB specific surface area of the silica being from 80 to 190 m2/g; a rubber hardness of the rubber composition being not greater than 60; and a product of a stress at the time of 400% elongation and a bottom surface area of a flange portion on a bottom side of the stud pins being not less than 400 MPa·mm2 and not greater than 850 MPa·mm2.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: March 17, 2020
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Keisuke Maejima, Satoshi Mihara
  • Publication number: 20190062536
    Abstract: Provided is a rubber composition including: (i) a sulfur vulcanizable elastomer, (ii) carbon black and/or a white filler, and (iii) a microparticle having a three-dimensionally crosslinked structure; the microparticle being a microparticle obtained by three-dimensionally crosslinking a polymer formed from an oligomer or prepolymer that has a sulfide bond formed from two or more sulfur atoms in a main chain and/or that has a thiol group.
    Type: Application
    Filed: February 22, 2017
    Publication date: February 28, 2019
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Kazushi Kimura, Hirokazu Kageyama, Satoshi Mihara
  • Publication number: 20190048174
    Abstract: Provided is a rubber composition containing from 1 to 50 parts by mass of an organic microparticle having an average particle size of 0.001 to 100 ?m and having a crosslinked structure per 100 parts by mass of a diene rubber, the organic microparticle being a crosslinked microparticle of a copolymer formed from at least two types of segments having repeating units that are different each other, the at least two types of segments being formed from an oligomer or prepolymer having a functional group and having a molecular weight of 500 to 20000, and the functional group forming a crosslinked structure between the at least two types of segments.
    Type: Application
    Filed: February 9, 2017
    Publication date: February 14, 2019
    Inventors: Kazushi Kimura, Satoshi Mihara, Hirokazu Kageyama
  • Publication number: 20190023880
    Abstract: The present invention is to provide an aromatic vinyl-diene copolymer which exhibits excellent mechanical properties and wear resistance when being formed into a tire, a method for producing the aromatic vinyl-diene copolymer, and a rubber composition containing the aromatic vinyl-diene copolymer. The aromatic vinyl-diene copolymer of an embodiment of the present invention is an aromatic vinyl-diene copolymer which is a copolymer of an aromatic vinyl and a diene, wherein the content of a repeating unit derived from an aromatic vinyl is 18 mass % or greater, among repeating units derived from a diene, a proportion of a vinyl structure is 8 mol % or less, a proportion of a 1,4-trans structure is 75 mol % or less, and a proportion of a 1,4-cis structure is from 17 to 90 mol %, and a glass transition temperature is ?60° C. or lower.
    Type: Application
    Filed: February 10, 2017
    Publication date: January 24, 2019
    Applicant: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Kazuya UENISHI, Makoto ASHIURA, Motoji FUJITA, Naoya AMINO, Satoshi MIHARA, Yu SHINKE
  • Publication number: 20180282446
    Abstract: The present invention is to provide a diene polymer that exhibits excellent low rolling resistance when used in a tire, a method for producing the diene polymer, and a rubber composition containing the diene polymer. The diene polymer of an embodiment of the present invention is produced by polymerizing a monomer containing at least a diene monomer by using an initiator prepared from an organolithium compound, an alkyl aluminum, and a metal alcoholate, and then terminating the polymerization by using an electrophile selected from the group consisting of titanium halides, tin halides, cyclic silazanes, alkoxysilanes, epoxides, amines, ketones, and compounds represented by Formula (N) below.
    Type: Application
    Filed: September 8, 2016
    Publication date: October 4, 2018
    Inventors: Kazuya UENISHI, Naoya AMINO, Makoto ASHIURA, Motoji FUJITA, Satoshi MIHARA, Yu SHINKE
  • Publication number: 20180281520
    Abstract: A rubber composition for a tire contains 100 parts by mass of a diene rubber (A) and from 1 to 60 parts by mass of an organic microparticle (B); an average particle size of the organic microparticle (B) being from 0.001 to 100 ?m, the organic microparticle (B) having a complex structure composed of a compatible component that is compatible with the diene rubber (A) and an incompatible component that is not compatible with the diene rubber (A), the complex structure having an inner part in which an amount of the incompatible component is greater than an amount of compatible component, and an outer part which covers at least a part of the inner part and in which the amount of the compatible component is greater than an amount of the incompatible component. A pneumatic tire including such rubber composition has a desirable elongation, rigidity, durability, and wear resistance.
    Type: Application
    Filed: August 26, 2016
    Publication date: October 4, 2018
    Inventors: Kazushi KIMURA, Hirokazu KAGEYAMA, Satoshi MIHARA
  • Patent number: 10086652
    Abstract: Provided is a rubber composition for a tire tread, which includes 1 or greater parts by mass and less than 20 parts by mass of a millable silicone rubber compound per 100 parts by mass of a diene rubber, wherein the millable silicone rubber compound has a storage modulus of 0.3 to 10 kPa at a 450% shear strain at 110° C. and a glass transition temperature and a plasticity with a relationship: 14000<(273+Tg)×Pn<82000, where Tg is the glass transition temperature (° C.) and the Pn is the plasticity at 23° C.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: October 2, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Satoshi Mihara
  • Patent number: 10081699
    Abstract: A rubber composition contains a diene rubber component containing at least 20 mass % of a modified conjugated diene rubber, a silica, and a silane coupling agent; the modified conjugated diene rubber having at least one modified part and at least one conjugated diene rubber part; the conjugated diene rubber part having a conjugated diene copolymer block and an isoprene block containing from 70 mass % to 100 mass % of isoprene units in each conjugated diene rubber part; the modified part bonding to an end of the conjugated diene rubber part and having a functional group which interacts with the silica; a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber component; the silane coupling agent being a polysiloxane represented by formula (1), (A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e)/2, and having a content from 1.0 to 20 mass % of the content of the silica.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: September 25, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Masaki Sato, Satoshi Mihara
  • Patent number: 10072131
    Abstract: The present invention provides a rubber composition a tire, by which both low rolling resistance and wet grip performance can be achieved at high levels. This rubber composition for a tire is obtained by blending from 66 to 180 parts by weight of a silica having a nitrogen adsorption specific surface area of from 150 to 400 m2/g into 100 parts by weight of a diene rubber; a size Rss of aggregates of the silica forming a hierarchical structure being from 14 to 23 nm when the rubber composition is measured by ultra-small-angle X-ray scattering and an obtained scattering profile is applied to a Unified-Guinier function.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: September 11, 2018
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Masaki Sato, Satoshi Mihara
  • Publication number: 20180207984
    Abstract: The present invention provides: a rubber composition for tires which has excellent processability and has excellent low heat build-up when formed into a tire; and a pneumatic tire using the same. The rubber composition for tires of the present invention is a rubber composition for tires, the rubber composition containing a diene rubber (A) and a microparticle (B), a vinyl group content of the diene rubber (A) being from 5 to 35 mass %, the microparticle (B) being a mercapto group-containing organic microparticle in which a crosslinkable oligomer or polymer (b1) is crosslinked, an average particle size of the microparticle (B) being from 1 to 200 ?m, and a content of the microparticle (B) being from 1 to 55 parts by mass per 100 parts by mass of the diene rubber (A).
    Type: Application
    Filed: July 22, 2016
    Publication date: July 26, 2018
    Inventors: Satoshi MIHARA, Kazushi KIMURA, Hirokazu KAGEYAMA
  • Publication number: 20180194167
    Abstract: Provided is a rubber composition for a tire tread, which includes 1 or greater parts by mass and less than 20 parts by mass of a millable silicone rubber compound per 100 parts by mass of a diene rubber, wherein the millable silicone rubber compound has a storage modulus of 0.3 to 10 kPa at a 450% shear strain at 110° C. and a glass transition temperature and a plasticity with a relationship: 14000<(273+Tg)×Pn<82000, where Tg is the glass transition temperature (° C.) and the Pn is the plasticity at 23° C.
    Type: Application
    Filed: July 1, 2016
    Publication date: July 12, 2018
    Inventor: Satoshi Mihara
  • Patent number: 9982116
    Abstract: Provided are a tire rubber composition capable of producing a pneumatic tire having excellent rigidity and wear resistance and a pneumatic tire using the same. The tire rubber composition includes 100 parts by mass of a diene rubber (A) and from 1 to 50 parts by mass of elastic microparticles (B), wherein the elastic microparticles (B) have a form of microparticles obtained by crosslinking a crosslinkable oligomer or polymer (b1) in water or an organic solvent, or in the diene rubber (A), and have an average particle size of from 0.001 to 100 ?m, the JIS A hardness of a cured product obtained by crosslinking the crosslinkable oligomer or polymer (b1) without use of water, the organic solvent or the diene rubber (A) is greater than 45, and the elongation of the cured product is 200% or greater.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: May 29, 2018
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazushi Kimura, Hirokazu Kageyama, Satoshi Mihara
  • Patent number: 9969865
    Abstract: A rubber composition for tires comprises a diene rubber, silica, and a silane coupling agent, and is characterized in that a function v of a shear modulus G? of the rubber composition at 0.28% shear stress at 110° C., a CTAB specific surface area (CTAB) of the silica, a volume fraction (?) of the silica in the rubber composition, and a stress at 100% elongation (M100) of the rubber composition satisfies the relationship of the following equation (i): G?=K×v, where K is a coefficient greater than 0 and not greater than 450, and v is represented by the following equation (ii): v=?×(1+0.0258×CTAB×M100) and is a real number not less than 2.5 and not greater than 20.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: May 15, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Satoshi Mihara