Patents by Inventor Yoshiyuki Udagawa

Yoshiyuki Udagawa 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: 9145485
    Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: September 29, 2015
    Assignee: JSR CORPORATION
    Inventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
  • Patent number: 8946349
    Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: February 3, 2015
    Assignee: JSR Corporation
    Inventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
  • Publication number: 20130172481
    Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.
    Type: Application
    Filed: August 10, 2011
    Publication date: July 4, 2013
    Applicant: JSR CORPORATION
    Inventors: Koji Okada, Ryoji Tanaka, Yoshiyuki Udagawa
  • Publication number: 20080295935
    Abstract: A rubber composition comprising: (A) a rubber component including 30 to 100 mass % of diene rubber having at least one functional group selected from the group consisting of an amino group, an alkoxysilyl group, an epoxy group, a hydroxyl group, and a carboxyl group in an amount of 0.01 to 5.0 mmol per 100 g of the diene rubber; (B) silica in an amount of 5 to 130 parts by mass per 100 parts by mass of the rubber component; and (C) an aliphatic component having at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group, and an epoxy group in an amount of 3 to 15 parts by mass per 100 parts by mass of the silica. The rubber composition and a tire using the rubber composition exhibit excellent scorching properties before vulcanization and exhibit excellent rolling resistance and wet skid properties after vulcanization.
    Type: Application
    Filed: August 3, 2005
    Publication date: December 4, 2008
    Applicant: JSR CORPORATION
    Inventors: Naokazu Kobayashi, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Patent number: 6977286
    Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d) one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: December 20, 2005
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
  • Publication number: 20050182159
    Abstract: An objective of the present invention is to provide a production process capable of improving an operation efficiency of a diene-based rubber-inorganic compound composite during production by forming a composite having high dispersibility of an inorganic compound in a diene-based rubber and having relatively large crumb diameter upon coagulation. The present invention provides a process for producing a composite comprising a diene-based rubber and an inorganic compound represented by the general formula: wM.xSiOy.zH2O (where M is at least one metal element selected from the group consisting of Al, Mg, Ti and Ca, metal oxide thereof or metal hydroxide thereof, and w, x, y, and z are an integer of from 1 to 5, an integer of from 0 to 10, an integer of from 2 to 5, and an integer of from 0 to 10, respectively.), and comprises a step of mixing the inorganic compound and/or a material capable of forming the inorganic compound, an anionic compound and a dispersion liquid of the diene-based rubber.
    Type: Application
    Filed: March 16, 2004
    Publication date: August 18, 2005
    Applicant: JRS Corporation
    Inventors: Yoshiyuki Udagawa, Tsukasa Toyoshima, Toshihiro Tadaki
  • Publication number: 20040152844
    Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d)one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.
    Type: Application
    Filed: January 23, 2004
    Publication date: August 5, 2004
    Applicant: JSR Corporation
    Inventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
  • Patent number: 6747095
    Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like, gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like, and thus is useful in a belt, a hose and a tire and the like, as well as a crosslinked rubber particle for obtaining such rubber composition. A rubber composition of the invention comprises [1] a crosslinked rubber particle comprising as repeating units (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group, (d) one polymerizable unsaturated group and an amino group, a hydroxyl group and an epoxy group and (e) 0.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: June 8, 2004
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
  • Patent number: 6740704
    Abstract: The object of the present invention is to provide a method for producing a diene-based rubber/inorganic compound complex capable of allowing a silicic acid compound including silica and the like to be dispersed uniformly and allowing a reinforcing effect to be exerted sufficiently, and a rubber composition containing said complex.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: May 25, 2004
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Patent number: 6727307
    Abstract: A rubber composition comprises a polar group-containing diene polymer synthesized through an emulsion polymerization as a rubber component, and an inorganic filler represented by a formula of mM.xSiOy.zH2O wherein M is a metal selected from the group consisting of aluminum, magnesium, titanium and calcium, an oxide or a hydroxide of such a metal or an hydrate thereof, m is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: April 27, 2004
    Assignees: Bridgestone Corporation, JSR Corporation
    Inventors: Hajime Kondo, Kazuhiro Yanagisawa, Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Patent number: 6703470
    Abstract: An objective of the invention is to provide a conjugated diene-based rubber having a specific composition and an oil extended rubber using the same, as well as a rubber composition capable of being converted into a vulcanized rubber which has a low rolling resistance, an excellent wearing resistance and the like, and is useful for a tire or the like. A conjugated diene-based rubber in the invention has repeating units consisting of 1 to 30% by mass of an olefinically unsaturated nitrile monomer unit such as acrylonitrile, 10 to 50% by mass of an aromatic vinyl monomer unit such as styrene, 19.9 to 88.9% by mass of a conjugated diene monomer unit such as 1,3-butadiene and 0.1 to 10% by mass of a monomer unit having one polymerizable unsaturated group and at least one functional group selected from the group consisting of an amino group, a hydroxyl group, an epoxy group, a carboxyl group and an alkoxysilyl group, and has a specific glass transition point and a Mooney viscosity [ML1+4(100° C.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: March 9, 2004
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Patent number: 6699935
    Abstract: It is an object of the present invention to provide a rubber composition which can give a vulcanized rubber with low rolling resistance and excellent wet skid resistance and wear resistance, which is particularly useful for automobile tire treads and the like. The rubber composition of the invention comprises (1) a crosslinked rubber particle containing, as repeating units, 40 to 79.99% by weight of a monomer unit formed by a conjugated diene such as 1,3-butadiene, 20 to 50% by weight of a monomer unit formed by an aromatic vinyl monomer such as styrene and 0.01 to 10% by weight of a monomer unit formed by a monomer having at least two polymerizable unsaturated groups such as divinylbenzene, and (2) a conjugated diene/aromatic vinyl copolymeric rubber whose vinyl content of the conjugated diene monomer unit is 10 to 30% and whose 1,4-trans bond content is more than 55%, such as styrene-butadiene copolymeric rubber.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: March 2, 2004
    Assignee: JSR Corporation
    Inventors: Hiroshi Akema, Toshihiro Tadaki, Yoshiyuki Udagawa, Tomohisa Konno, Takafumi Fueki, Hajime Kondou
  • Publication number: 20040030027
    Abstract: The invention provides a diene-based rubber-inorganic compound composite material comprising a diene-based rubber and at least one inorganic compound selected from silica and a compound represented by the following formula (I):
    Type: Application
    Filed: March 10, 2003
    Publication date: February 12, 2004
    Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki, Hajime Kondo, Kazuhiro Yanagisawa
  • Patent number: 6653404
    Abstract: A rubber composition having satisfactory processability and dimension stability, exhibits excellent tensile strength and wearing resistance when vulcanized and comprises (1) a crosslinked rubber particle containing as repeating units (a) 39.89 to 79.89% by weight of a conjugated diene unit such as 1,3-butadiene or the like, (b) 20 to 60% by weight of an aromatic vinyl unit such as styrene, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated group such as divinylbenzene, and the like, and (d) 0.1 to 30% by weight of a monomer unit having one polymerizable unsaturated group and an amino group such as vinylbenzylmethylamine, and the like and (2) a conjugated diene/aromatic vinyl copolymeric rubber such as styrene-butadiene copolymeric rubber and the like.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: November 25, 2003
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Toshihiro Tadaki, Yoshiyuki Udagawa, Hiroshi Akema
  • Publication number: 20030125467
    Abstract: It is an object of the present invention to provide a rubber composition which can give a vulcanized rubber with low rolling resistance and excellent wet skid resistance and wear resistance, which is particularly useful for automobile tire treads and the like.
    Type: Application
    Filed: February 28, 2002
    Publication date: July 3, 2003
    Inventors: Hiroshi Akema, Toshihiro Tadaki, Yoshiyuki Udagawa, Tomohisa Konno, Takafumi Fueki, Hajime Kondou
  • Patent number: 6562929
    Abstract: An objective of the invention is to provide a conjugated diene-based rubber having a specific composition and a method of producing the same, an oil extended rubber using the same, as well as a rubber composition capable of being converted into a vulcanized rubber which has a low rolling resistance, an excellent wearing resistance and the like, and is useful, for example, as a tire or the like. A conjugated diene-based rubber in the invention has a glass transition point of −60 to 0° C., an olefinically unsaturated nitrile monomer unit randomly contains in its molecular chain, its repeating units consists of 9 to 30% by mass of an olefinically unsaturated nitrile monomer unit such as acrylonitrile, 10 to 50% by mass of an aromatic vinyl monomer unit such as styrene and 20 to 81% by mass of a conjugated diene monomer unit such as 1,3-butadiene, and its Mooney viscosity [ML1+4(100° C.)] is 20 to 200.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: May 13, 2003
    Assignee: JSR Corporation
    Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Patent number: 6559219
    Abstract: A rubber composition of the invention comprises [1] a cross inked rubber particle component whose toluene-insolubles is 50% by weight or more and whose number mean particle size is 3 to 1000 nm and [2] a non-crosslinked rubber component whose toluene-insolubles is less than 20% by weight. This crosslinked rubber particle component is a polymer comprising at least one selected from (1) a conjugated diene unit, (2) a conjugated diene unit and an &agr;,&bgr;-unsaturated nitrile unit and (3) a conjugated diene unit and an acrylate unit as well as a monomer unit having at least 2 polymerizable unsaturated groups. The non-crosslinked rubber component described above is a polymer co rising at least one selected from (a) a conjugated diene unit, (b) (a) plus an aromatic vinyl unit, (c) (a) plus an &agr;,&bgr;-unsaturated nitrile unit, (d) (a) plus an acrylate unit and (e) an ethylene unit and an &agr;-olefin unit having 3 to 12 carbon atoms.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: May 6, 2003
    Assignee: JSR Corporation
    Inventors: Toshihiro Tadaki, Tomohisa Konno, Yoshiyuki Udagawa, Hiroshi Akema
  • Publication number: 20030008954
    Abstract: An objective of the invention is to provide a rubber composition which has satisfactory processability and dimension stability, and the like gives a vulcanized rubber exhibiting excellent wearing resistance and tensile strength, and the like and thus is useful in a belt, a hose and a tire, and the like. A rubber composition of the invention comprises [1] a crosslinked rubber particle component whose toluene-insolubles is 50 % by weight or more and whose number mean particle size is 3 to 1000 nm and [2] a non-crosslinked rubber component whose toluene-insolubles is less than 20 % by weight. This crosslinked rubber particle component is a polymer comprising at least one selected from (1) a conjugated diene unit, (2) a conjugated diene unit and an a, -unsaturated nitrile unit and (3) a conjugated diene unit and an acrylate unit as well as a monomer unit having at least 2 polymerizable unsaturated groups.
    Type: Application
    Filed: April 27, 2001
    Publication date: January 9, 2003
    Applicant: JSR Corporation
    Inventors: Toshihiro Tadaki, Tomohisa Konno, Yoshiyuki Udagawa, Hiroshi Akema
  • Publication number: 20020156169
    Abstract: A rubber composition comprises a polar group-containing diene polymer synthesized through an emulsion polymerization as a rubber component, and an inorganic filler represented by a formula of mM.xSiOy.zH2O wherein M is a metal selected from the group consisting of aluminum, magnesium, titanium and calcium, an oxide or a hydroxide of such a metal or an hydrate thereof, m is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10.
    Type: Application
    Filed: December 21, 2001
    Publication date: October 24, 2002
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hajime Kondo, Kazuhiro Yanagisawa, Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Publication number: 20020111418
    Abstract: The object of the present invention is to provide a method for producing a diene-based rubber/inorganic compound complex capable of allowing a silicic acid compound including silica and the like to be dispersed uniformly and allowing a reinforcing effect to be exerted sufficiently, and a rubber composition containing said complex.
    Type: Application
    Filed: December 11, 2001
    Publication date: August 15, 2002
    Applicant: JSR Corporation
    Inventors: Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki