Patents by Inventor Takahito Muraki

Takahito Muraki 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: 20190202959
    Abstract: In a conventional self-healing material, although the resin properties after self-healing are restored to the same level as the initial refractoriness and strength of the resin, no further extension of life can be expected. A resin cured product according to the present invention includes: a first vinyl monomer having an ester bond; a second vinyl monomer having a hydroxyl group; a transesterification reaction catalyst; and a boron compound.
    Type: Application
    Filed: July 7, 2017
    Publication date: July 4, 2019
    Applicant: HITACHI, LTD.
    Inventors: Yuri KAJIHARA, Takahito MURAKI, Yasuhiko TADA, Jun NUNOSHIGE, Takeshi KONDO
  • Publication number: 20180215129
    Abstract: A functionally graded material according to the present invention adopts, for example, the following configuration. A functionally graded material is constituted by laminating a plurality of resin compositions. Among the plurality of resin compositions, a first resin composition has a different property from a second resin composition adjacent to the first resin composition. An interface between the first resin composition and the second resin composition is joined by a dynamic covalent bond.
    Type: Application
    Filed: July 31, 2015
    Publication date: August 2, 2018
    Applicant: HITACHI, LTD.
    Inventors: Yasuhiko TADA, Takahito MURAKI, Yuri KAJIHARA, Takeshi KONDO, Tadashi ARAI
  • Patent number: 9957413
    Abstract: A resin composition (601) containing the following is prepared: a base unsaturated-polyester resin and/or a base vinyl-ester resin; a base radical-polymerizable monomer; a radical-polymerizable monomer having a thermally latent isocyanate group; a photo-radical polymerization initiator; and an alkylborane and/or an alkoxyamine derivative. A stator coil (60) in a stator (20) in a dynamo-electric machine (10) is coated using said resin composition (601) only, i.e. just the one resin composition. An insulated coated section (29A) and a conductor-exposing section (29B) of a join-side coil end (62) are also coated using said resin composition (601).
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: May 1, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takahito Muraki, Satoshi Yamamura, Masahiko Honma, Yutaka Matsunobu
  • Patent number: 9944732
    Abstract: This invention is intended to synthesize a multi-branched polymer, which has an uniform molecular chain lengths and is free from branch defects, without the need for purification. This invention is also intended to synthesize a polyfunctional radical polymerization initiator represented by Formula 1: wherein n is an integer of 1 or larger; Y is a polyfunctional unsaturated compound; R1 is a hydrocarbon group; R2 is a structure in which one molecule of a radically polymerizable unsaturated hydrocarbon compound is bound to R1 and the oxygen atom; X1 of B—X1 (boron-X1) bond is an alkoxy or phenyl group; and X2 of B—X2 (boron-X2) bond is an alkoxy or phenyl group.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: April 17, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Yuri Kajihara, Takahito Muraki, Jun Nunoshige
  • Publication number: 20180086876
    Abstract: It is an object of the present invention to provide a thermosetting resin composition which allows stress relaxation in an ester exchange reaction and the long-term use of the thermosetting resin composition having such a structure. A thermosetting resin composition of the present invention contains: an ester bond; and a functional group protected by a protecting group. The functional group is deprotected by external stimulus. The functional group and the ester bond can be subjected to an ester exchange reaction.
    Type: Application
    Filed: January 26, 2015
    Publication date: March 29, 2018
    Applicant: HITACHI, LTD.
    Inventors: Yasuhiko TADA, Takahito MURAKI, Yuri KAJIHARA
  • Publication number: 20180009955
    Abstract: A resin produced by a conventional technique has a weak nature in terms of hydrolysis resistance. For example, in a case where the resin produced by a conventional technique is used in an area with a highly humid climate such as Japan for a long period of time, deterioration of the resin due to hydrolysis becomes a concern. A resin composition is described that is optimized in the molecular structure design of the resin and in the catalyst in order to improve the hydrolysis resistance. Specifically, the resin composition contains (1) a copolymer of a vinyl compound having two or more epoxy groups, a carboxylic acid anhydride, and a transesterification reaction catalyst, or (2) a copolymer of a vinyl compound having two or more carboxylic acid anhydride groups, an epoxy, and a transesterification reaction catalyst.
    Type: Application
    Filed: January 12, 2016
    Publication date: January 11, 2018
    Applicant: HITACHI, LTD.
    Inventors: Yuri KAJIHARA, Takahito MURAKI, Tadashi ARAI, Yasuhiko TADA
  • Patent number: 9771436
    Abstract: The present invention provides a method for forming a polymer by using a mixture containing a polymerization initiator which is an adduct of a boron compound and a first unsaturated hydrocarbon compound, and a second unsaturated hydrocarbon compound, generating a radical by oxidization of the polymerization initiator and adding the radical to the second unsaturated hydrocarbon compound, thereby forming the polymer. According to the present invention, excellent controllability of alkylboranes for radical polymerization can be maintained and the structure of a polymerization initiation terminal can be freely selected and controlled. Thus, a terminal-modified polymer having functionality imparted to the terminal group can be prepared. In addition, a polymerization initiator having a plurality of polymerization starting points can be prepared, and polymers with special structures including multibranched polymers, grafted-type (comb-type) polymers and brush-shaped polymers can be prepared.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: September 26, 2017
    Assignee: HITACHI, LTD.
    Inventors: Jun Nunoshige, Takahito Muraki, Hiroyuki Kagawa
  • Publication number: 20170145209
    Abstract: It is an object of the present invention to provide an excellent thermosetting resin that achieves both higher heat resistance and higher toughness and mechanical strength for improving cracking resistance and lower viscosity which are conventionally in a trade-off relationship. It is also an object of the present invention to provide an electronic•electrical device using a cured product of the thermosetting resin as an insulating material or a structural material. The present invention includes a plurality of means for achieving the above objects, and one of the means is a thermosetting resin composition comprising: a three-dimensional copolymer obtained by copolymerizing a maleimide derivative and a styrene derivative with use of an alkyl borane or a boron compound as a polymerization initiator; and a thermosetting resin composition.
    Type: Application
    Filed: May 18, 2015
    Publication date: May 25, 2017
    Applicant: HITACHI, LTD.
    Inventors: Yuri KAJIHARA, Satoru AMOU, Takahito MURAKI
  • Publication number: 20160376466
    Abstract: A resin composition (601) containing the following is prepared: a base unsaturated-polyester resin and/or a base vinyl-ester resin; a base radical-polymerizable monomer; a radical-polymerizable monomer having a thermally latent isocyanate group; a photo-radical polymerization initiator; and an alkylborane and/or an alkoxyamine derivative. A stator coil (60) in a stator (20) in a dynamo-electric machine (10) is coated using said resin composition (601) only, i.e. just the one resin composition. An insulated coated section (29A) and a conductor-exposing section (29B) of a join-side coil end (62) are also coated using said resin composition (601).
    Type: Application
    Filed: May 16, 2014
    Publication date: December 29, 2016
    Inventors: Takahito MURAKI, Satoshi YAMAMURA, Masahiko HONMA, Yutaka MATSUNOBU
  • Publication number: 20160319056
    Abstract: This invention is intended to synthesize a multi-branched polymer, which has an uniform molecular chain lengths and is free from branch defects, without the need for purification. This invention is also intended to synthesize a polyfunctional radical polymerization initiator represented by Formula 1: wherein n is an integer of 1 or larger; Y is a polyfunctional unsaturated compound; R1 is a hydrocarbon group; R2 is a structure in which one molecule of a radically polymerizable unsaturated hydrocarbon compound is bound to R1 and the oxygen atom; X1 of B—X1 (boron-X1) bond is an alkoxy or phenyl group; and X2 of B—X2 (boron-X2) bond is an alkoxy or phenyl group.
    Type: Application
    Filed: December 27, 2013
    Publication date: November 3, 2016
    Inventors: Yuri KAJIHARA, Takahito MURAKI, Jun NUNOSHIGE
  • Publication number: 20160042836
    Abstract: Provided are an insulated wire which is excellent in heat resistance and pressure resistance, and a rotary electric machine which uses the same. An insulated wire includes an insulating resin layer that is formed on an outer periphery of a conductor, in which the insulating resin layer has a thermoplastic phenoxy resin, an epoxy resin, a cross-linking agent, an inorganic filler, and fine rubber particles.
    Type: Application
    Filed: July 30, 2015
    Publication date: February 11, 2016
    Inventors: Yoshiaki OKABE, Kotaro ARAYA, Takahito MURAKI, Satoru AMOU, Tadashi ARAI
  • Publication number: 20150307638
    Abstract: The present invention provides a method for forming a polymer by using a mixture containing a polymerization initiator which is an adduct of a boron compound and a first unsaturated hydrocarbon compound, and a second unsaturated hydrocarbon compound, generating a radical by oxidization of the polymerization initiator and adding the radical to the second unsaturated hydrocarbon compound, thereby forming the polymer. According to the present invention, excellent controllability of alkylboranes for radical polymerization can be maintained and the structure of a polymerization initiation terminal can be freely selected and controlled. Thus, a terminal-modified polymer having functionality imparted to the terminal group can be prepared. In addition, a polymerization initiator having a plurality of polymerization starting points can be prepared, and polymers with special structures including multibranched polymers, grafted-type (comb-type) polymers and brush-shaped polymers can be prepared.
    Type: Application
    Filed: September 6, 2012
    Publication date: October 29, 2015
    Applicant: Hitachi Ltd.
    Inventors: Jun NUNOSHIGE, Takahito MURAKI, Hiroyuki KAGAWA
  • Publication number: 20150152230
    Abstract: An object of the present invention is to provide: a resin composition which yields a hardened product having both processability/formability and thermal resistance; and an electrical device using the hardened product of the resin composition. A resin composition containing (A) polyarylene type thermoplastic polymer shown by Expression 1 and (B) chemical compound having at least two substituent groups capable of generating cationic species.
    Type: Application
    Filed: April 10, 2013
    Publication date: June 4, 2015
    Inventors: Takahito Muraki, Satoru Amou, Hiroyuki Kagawa
  • Publication number: 20140211373
    Abstract: The purpose of the present invention is to provide composite particulates and a method for manufacturing the composite particulates, the particulates including an organic substance and a metal having exceptional adhesiveness to a substrate, allowing easier control over metallic particle dispersion, facilitating control over electrical conductivity, and exhibiting high electroconductivity. The metallic particulates are characterized in that they have a thiol compound coordinated on the surfaces thereof, they are adsorbed onto a substrate with a silane compound interposed therebetween, and the thiol compound on the surfaces is subjected to oxidative polymerization, thereby yielding a structure in which an electroconductive polymer is coordinate-bonded to the surface of the metallic particulates.
    Type: Application
    Filed: August 2, 2012
    Publication date: July 31, 2014
    Applicant: HITACHI, LTD.
    Inventors: Taku Oyama, Satoru Amou, Kosuke Kuwabara, Takahito Muraki
  • Patent number: 8735724
    Abstract: An electric equipment of the present invention has an insulation structure at a welding part formed by joining end parts of a plurality of conductors with each other, the welding part having a rectangular cross section and being coated with an insulating coating, in which the insulating coating is voidless and has a coating thickness of 50 to 1000 ?m in the welding part, and in which an edge cover ratio of the insulating coating is 20% or more. According to the present invention, the insulation performance of the insulation structure in which the welding part formed by joining the end parts of the plurality of conductors with each other can be improved, the welding part having a rectangular cross section and being coated with an insulating coating, and a highly reliable electric equipment can be provided.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: May 27, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Takahito Muraki, Satoru Amou
  • Publication number: 20120097447
    Abstract: An electric equipment of the present invention has an insulation structure at a welding part formed by joining end parts of a plurality of conductors with each other, the welding part having a rectangular cross section and being coated with an insulating coating, in which the insulating coating is voidless and has a coating thickness of 50 to 1000 ?m in the welding part, and in which an edge cover ratio of the insulating coating is 20% or more. According to the present invention, the insulation performance of the insulation structure in which the welding part formed by joining the end parts of the plurality of conductors with each other can be improved, the welding part having a rectangular cross section and being coated with an insulating coating, and a highly reliable electric equipment can be provided.
    Type: Application
    Filed: October 17, 2011
    Publication date: April 26, 2012
    Inventors: Takahito MURAKI, Satoru Amou
  • Publication number: 20110316661
    Abstract: It is an objective of the present invention to provide a highly adhesive unsaturated polyester resin composition for fixing or immobilizing coils. There is provided an unsaturated polyester resin composition for adhesion of a coil, which includes the ingredients of: A) an unsaturated polyester resin and/or a vinyl ester resin; B) a monomer including a vinyl group as a polymerizable substituent at at least one end thereof; C) an isocyanate; and D) a polymerization initiator.
    Type: Application
    Filed: June 23, 2011
    Publication date: December 29, 2011
    Inventors: Takahito MURAKI, Satoru Amou, Tomio Iwasaki
  • Publication number: 20100156587
    Abstract: A thermosetting resin composition comprises (A) a polymeric component having at least two polymerizable substituents in the molecule, (B) a compound having at least one polymerizable substituent in the molecule and (C) a living polymerization agent for curing the resin composition.
    Type: Application
    Filed: December 22, 2009
    Publication date: June 24, 2010
    Inventors: Takahito Muraki, Hisashi Morooka, Hiroyuki Kagawa, Satoru Amou