Patents by Inventor Toshihiro Tadaki

Toshihiro Tadaki 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: 9212276
    Abstract: By a method comprising a process including (a) producing a modified conjugated diene polymer through reaction of a conjugated diene polymer having an alkali metal or alkaline-earth metal active terminal with a first alkoxysilane compound which has both an alkoxysilyl group and at least one group convertible into an onium, and (b) mixing the modified conjugated diene polymer, an agent for producing onium, a second alkoxysilane compound having an alkoxysilyl group and at least one group convertible into an onium and a condensation catalyst containing metal element(s) for alkoxysilane compounds, conjugated diene rubber usable as a starting material of cross-linked rubber which is used for a tire tread or the like and allows enhancement of low fuel consumption property can be obtained.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: December 15, 2015
    Assignee: JSR CORPORATION
    Inventors: Ryouji Tanaka, Masahiro Shibata, Takaomi Matsumoto, Kenji Hasegawa, Toshihiro Tadaki
  • Patent number: 9206264
    Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: December 8, 2015
    Assignee: JSR CORPORATION
    Inventors: Masahiro Shibata, Takaomi Matsumoto, Tamotsu Nagaoka, Takuo Sone, Toshihiro Tadaki
  • Patent number: 8809440
    Abstract: There is provided a method of producing a conjugated diene rubber capable of being used as a starting material for a crosslinked rubber that can be used in applications such as tire treads and can raise the fuel efficiency.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: August 19, 2014
    Assignee: JSR Corporation
    Inventors: Ryouji Tanaka, Masahiro Shibata, Takahiro Nakamura, Kenji Hasegawa, Toshihiro Tadaki
  • Patent number: 8557915
    Abstract: A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: October 15, 2013
    Assignees: JSR Corporation, Bridgestone Corporation
    Inventors: Takahiro Nakamura, Kouichirou Tani, Ryouji Tanaka, Takuo Sone, Toshihiro Tadaki, Junko Kurazumi, Koji Masaki, Yoichi Ozawa
  • Publication number: 20130085228
    Abstract: By a method comprising a process including (a) producing a modified conjugated diene polymer through reaction of a conjugated diene polymer having an alkali metal or alkaline-earth metal active terminal with a first alkoxysilane compound which has both an alkoxysilyl group and at least one group convertible into an onium, and (b) mixing the modified conjugated diene polymer, an agent for producing onium, a second alkoxysilane compound having an alkoxysilyl group and at least one group convertible into an onium and a condensation catalyst containing metal element(s) for alkoxysilane compounds, conjugated diene rubber usable as a starting material of cross-linked rubber which is used for a tire tread or the like and allows enhancement of low fuel consumption property can be obtained.
    Type: Application
    Filed: May 24, 2011
    Publication date: April 4, 2013
    Applicant: JSR CORPORATION
    Inventors: Ryouji Tanaka, Masahiro Shibata, Takaomi Matsumoto, Kenji Hasegawa, Toshihiro Tadaki
  • Patent number: 8410224
    Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises (a) obtaining a primarily modified polymer by carrying out a primary modification reaction wherein at least one member selected from the group consisting of an alkoxysilane compound and a silanol compound is introduced into the active alkali metal terminal of a conjugated diene based (co)polymer having an active alkali metal terminal, and (b) obtaining a secondarily modified polymer (a modified conjugated diene based (co)polymer) by subjecting the above-obtained primarily modified polymer to reactions comprising (b1) and (b2). (b1): a reaction with a condensation accelerator comprising a metal element. (b2): a reaction with at least one member selected from the group consisting of inorganic acids and metal halides.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: April 2, 2013
    Assignees: JSR Corporation, Bridgestone Corporation
    Inventors: Takaomi Matsumoto, Masahiro Shibata, Takuo Sone, Toshihiro Tadaki, Ken Tanaka, Ryuji Nakagawa
  • Patent number: 8404785
    Abstract: A method for producing a modified conjugated diene polymer includes a step (A) carrying out a primary modification reaction that reacts a heterocumulene compound having two or more specific functional groups with a conjugated diene polymer having a vinyl content of below 10% and a cis-1,4-bond content of 75% or more and possessing an active end to obtain a primary-modified conjugated diene polymer, and a step (B) carrying out a secondary modification reaction that reacts an active hydrogen-containing compound that includes one or more functional groups selected from the group consisting of an amino group, an imino group, a mercapto group, and a hydroxyl group with the primary-modified conjugated diene polymer to obtain a secondary-modified conjugated diene polymer. The method can produce a modified conjugated diene polymer that exhibits low heat build-up (low fuel consumption) and excellent wear resistance.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: March 26, 2013
    Assignee: JSR Corporation
    Inventors: Ryouji Tanaka, Kouichirou Tani, Takuo Sone, Toshihiro Tadaki
  • Publication number: 20120270997
    Abstract: There is provided a method of producing a conjugated diene rubber capable of being used as a starting material for a crosslinked rubber that can be used in applications such as tire treads and can raise the fuel efficiency.
    Type: Application
    Filed: October 21, 2010
    Publication date: October 25, 2012
    Applicant: JSR CORPORATION
    Inventors: Ryouji Tanaka, Masahiro Shibata, Takahiro Nakamura, Kenji Hasegawa, Toshihiro Tadaki
  • Patent number: 8268921
    Abstract: The instant invention relates to elastomeric compositions especially useful for manufacturing articles for tires which comprise: (1) at least one butadienic elastomer E, containing a functionalized butadienic elastomer prepared in solution, and modified by a polyfunctional alkoxy silane coupling agent; and (2) a specific precipitated silica having high dispersibility properties and containing aluminum, as at least one reinforcing filler in said butadienic elastomer.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: September 18, 2012
    Assignees: Rhodia Chimie, JSR Corporation
    Inventors: Philippe Cochet, Dominique Petit, Toshihiro Tadaki, Naokazu Kobayashi
  • Patent number: 8258241
    Abstract: A method for producing a modified conjugated diene polymer includes a modification step (A) that subjects a conjugated diene polymer having a cis-1,4-bond content of 98.5% or more and possessing an active end to a modification reaction to introduce an alkoxysilane compound having two or more reactive groups including an alkoxysilyl group into the active end of the conjugated diene polymer, and a condensation step (B) that subjects the residue of the alkoxysilane compound introduced into the active end to a condensation reaction in the presence of a condensation catalyst that includes at least one element among the elements of the groups 4A, 2B, 3B, 4B, and 5B in the periodic table. The method can produce a modified conjugated diene polymer that exhibits low heat build-up and excellent wear resistance.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: September 4, 2012
    Assignee: JSR Corporation
    Inventors: Ryouji Tanaka, Takahiro Nakamura, Takuo Sone, Toshihiro Tadaki
  • Publication number: 20120142851
    Abstract: A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.
    Type: Application
    Filed: February 13, 2012
    Publication date: June 7, 2012
    Applicants: BRIDGESTONE CORPORATION, JSR CORPORATION
    Inventors: Takahiro NAKAMURA, Kouichirou Tani, Ryouji Tanaka, Takuo Sone, Toshihiro Tadaki, Junko Kurazumi, Koji Masaki, Yoichi Ozawa
  • Patent number: 8178626
    Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: May 15, 2012
    Assignee: JSR Corporation
    Inventors: Masahiro Shibata, Takaomi Matsumoto, Tamotsu Nagaoka, Takuo Sone, Toshihiro Tadaki
  • Publication number: 20120108737
    Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.
    Type: Application
    Filed: January 10, 2012
    Publication date: May 3, 2012
    Applicant: JSR CORPORATION
    Inventors: Masahiro Shibata, Takaomi Matsumoto, Tamotsu Nagaoka, Takuo Sone, Toshihiro Tadaki
  • Patent number: 8153723
    Abstract: A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: April 10, 2012
    Assignees: JSR Corporation, Bridgestone Corporation
    Inventors: Takahiro Nakamura, Kouichirou Tani, Ryouji Tanaka, Takuo Sone, Toshihiro Tadaki, Junko Kurazumi, Koji Masaki, Yoichi Ozawa
  • Patent number: 8022129
    Abstract: A conjugated diolefin copolymer rubber is produced by copolymerization of a conjugated diolefin and an aromatic vinyl compound and has a primary amino group and an alkoxysilyl group bonded to the copolymer chain. The conjugated diolefin copolymer rubber contains the aromatic vinyl compound in an amount of 5 to 60 wt %. The aromatic vinyl compound is densely distributed in one terminal of the copolymer chain, and is scarcely distributed in the other terminal. The conjugated diolefin copolymer rubber has a temperature difference (?Tg) of 25° C. or more. The conjugated diolefin copolymer rubber has low hysteresis loss properties as well as improved abrasion resistance, rupture characteristics, and road grip characteristics without impairing wet skid characteristics. A method for producing the conjugated diolefin copolymer rubber is also disclosed.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: September 20, 2011
    Assignee: JSR Corporation
    Inventors: Toshihiro Tadaki, Masahiro Shibata, Tamotsu Nagaoka, Takuo Sone
  • Patent number: 7981966
    Abstract: There is obtained a rubber composition excellent in processability of unvulcanized compounded rubber, excellent in wear resistance and wet skid resistance of vulcanized rubber, low in rolling resistance, and suitable for tire applications, particularly for tire tread applications in which importance is given to low fuel consumption and safety. A rubber composition mainly comprising (I) 0.5 to 35% by weight of a conjugated diene-based (co)polymer rubber having an amino group and an alkoxysilyl group on a polymer chain and having a weight average molecular weight of 1,000 to 90,000, and (II) 99.5 to 65% by weight of a conjugated diene-based (co)polymer rubber having a weight average molecular weight of 100,000 to 2,000,000 (with the proviso that (I)+(II)=100% by weight).
    Type: Grant
    Filed: March 2, 2005
    Date of Patent: July 19, 2011
    Assignee: JSR Corporation
    Inventors: Naokazu Kobayashi, Kouta Taniguchi, Toshihiro Tadaki
  • Patent number: 7893153
    Abstract: A process for producing a modified conjugated diene polymer includes subjecting an active terminal of a conjugated diene polymer having a vinyl content of less than 10% and a cis-1,4 bond content of 75% or more to a modification reaction with an alkoxysilane compound, and subjecting the alkoxysilane compound (residue) to a condensation reaction in an aqueous solution at a pH of 9 to 14 and a temperature of 85 to 180° C. in the presence of a condensation accelerator including a compound containing titanium. The modified conjugated diene polymer exhibits low heat build-up and increased reinforcing properties when used for a rubber composition, and exhibits excellent wear resistance, mechanical characteristics, and processability.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: February 22, 2011
    Assignees: JSR Corporation, Bridgestone Corporation
    Inventors: Ryouji Tanaka, Kouichirou Tani, Takuo Sone, Toshihiro Tadaki, Junko Kurazumi, Koji Masaki, Yoichi Ozawa
  • Patent number: 7893164
    Abstract: There is provided a method for producing a conjugated diolefin (co)polymer rubber excellent in processability, independently of the kind and combination of filling agent incorporated, excellent in a balance among wet-skid characteristics, low hysteresis loss, wear resistance and breaking strength, when vulcanization treatment is performed to form a vulcanized rubber, and useful as a material for a tread or a sidewall member of a tire for low fuel consumption, a large sized tire or a high performance tire.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: February 22, 2011
    Assignee: JSR Corporation
    Inventors: Takuo Sone, Takaomi Matsumoto, Toshihiro Tadaki
  • Publication number: 20110015302
    Abstract: A method for producing a modified conjugated diene polymer includes a modification step (A) that subjects a conjugated diene polymer having a cis-1,4-bond content of 98.5% or more and possessing an active end to a modification reaction to introduce an alkoxysilane compound having two or more reactive groups including an alkoxysilyl group into the active end of the conjugated diene polymer, and a condensation step (B) that subjects the residue of the alkoxysilane compound introduced into the active end to a condensation reaction in the presence of a condensation catalyst that includes at least one element among the elements of the groups 4A, 2B, 3B, 4B, and 5B in the periodic table. The method can produce a modified conjugated diene polymer that exhibits low heat build-up and excellent wear resistance.
    Type: Application
    Filed: December 27, 2007
    Publication date: January 20, 2011
    Applicant: JSR CORPORATION
    Inventors: Ryouji Tanaka, Takahiro Nakamura, Takuo Sone, Toshihiro Tadaki
  • Publication number: 20100317794
    Abstract: A method for producing a modified conjugated diene polymer includes carrying out a modification reaction that reacts a modifier that includes a specific compound with a conjugated diene polymer having a cis-1,4-bond content of 98.5% or more and possessing an active end to introduce the modifier into the active end of the conjugated diene polymer to obtain a modified conjugated diene polymer. The modified conjugated diene polymer that exhibits excellent wear resistance, excellent mechanical properties, and reduced cold flow can be obtained by the method.
    Type: Application
    Filed: December 27, 2007
    Publication date: December 16, 2010
    Applicant: JSR CORPORATION
    Inventors: Ryouji Tanaka, Takuo Sone, Toshihiro Tadaki