Patents by Inventor Naruhiko Mashita

Naruhiko Mashita 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: 9567446
    Abstract: Micro-sized particles having a polymeric structure of cells are provided. Also provided is a method of producing micro-sized particles having a polymeric structure comprising: (1) forming a homogenous solution by heating a mixture of a high molecular weight polymer and a low molecular weight material, wherein said low molecular weight material makes up at least about 50% by weight of the homogenous solution, (2) forming a dispersed solution by dispersing the homogenous solution formed in step (1) into an inert material, (3) cooling the dispersed solution to cause the high molecular weight polymer to phase separate from the low molecular weight material, (4) forming solid particles comprised of said low molecular weight material trapped inside a structure of cells of said high molecular weight polymer, and (5) removing the solid particles from the dispersed solution.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: February 14, 2017
    Assignee: Bridgestone Corporation
    Inventors: Xiaorong Wang, Mindaugas Rackaitis, Naruhiko Mashita, Victor Foltz
  • Publication number: 20150057367
    Abstract: Micro-sized particles having a polymeric structure of cells are provided. Also provided is a method of producing micro-sized particles having a polymeric structure comprising: (1) forming a homogenous solution by heating a mixture of a high molecular weight polymer and a low molecular weight material, wherein said low molecular weight material makes up at least about 50% by weight of the homogenous solution, (2) forming a dispersed solution by dispersing the homogenous solution formed in step (1) into an inert material, (3) cooling the dispersed solution to cause the high molecular weight polymer to phase separate from the low molecular weight material, (4) forming solid particles comprised of said low molecular weight material trapped inside a structure of cells of said high molecular weight polymer, and (5) removing the solid particles from the dispersed solution.
    Type: Application
    Filed: September 1, 2014
    Publication date: February 26, 2015
    Inventors: Xiaorong Wang, Mindaugas Rackaitis, Naruhiko Mashita, Victor Foltz
  • Patent number: 8821931
    Abstract: Micro-sized particles having a polymeric structure of cells are provided. Also provided is a method of producing micro-sized particles having a polymeric structure comprising: (1) forming a homogenous solution by heating a mixture of a high molecular weight polymer and a low molecular weight material, wherein said low molecular weight material makes up at least about 50% by weight of the homogenous solution, (2) forming a dispersed solution by dispersing the homogenous solution formed in step (1) into an inert material, (3) cooling the dispersed solution to cause the high molecular weight polymer to phase separate from the low molecular weight material, (4) forming solid particles comprised of said low molecular weight material trapped inside a structure of cells of said high molecular weight polymer, and (5) removing the solid particles from the dispersed solution.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: September 2, 2014
    Assignee: Bridgestone Corporation
    Inventors: Xiaorong Wang, Mindaugas Rackaitis, Naruhiko Mashita, Victor J. Foltz
  • Publication number: 20090285894
    Abstract: Micro-sized particles having a polymeric structure of cells are provided. Also provided is a method of producing micro-sized particles having a polymeric structure comprising: (1) forming a homogenous solution by heating a mixture of a high molecular weight polymer and a low molecular weight material, wherein said low molecular weight material makes up at least about 50% by weight of the homogenous solution, (2) forming a dispersed solution by dispersing the homogenous solution formed in step (1) into an inert material, (3) cooling the dispersed solution to cause the high molecular weight polymer to phase separate from the low molecular weight material, (4) forming solid particles comprised of said low molecular weight material trapped inside a structure of cells of said high molecular weight polymer, and (5) removing the solid particles from the dispersed solution.
    Type: Application
    Filed: November 13, 2008
    Publication date: November 19, 2009
    Inventors: Xiaorong Wang, Mindaugas Rackaitis, Naruhiko Mashita, Victor J. Foltz
  • Patent number: 7589661
    Abstract: A radio wave absorber that can be bonded securely to a flexible cable or a flexible printed circuit board eliminates the need for a release film. A radio wave absorber comprising a thermosetting adhesive sheet 1 that is cured into a flexible material, and a Sendust-containing curable resin composition layer 2 that is cured into a flexible material, wherein the curable resin composition layer is formed on either surface of the thermosetting adhesive sheet. The average particle diameter of Sendust is in the range of 30 to 100 ?m. The content ratio of Sendust in the curable resin composition layer is in the range of 50 to 85 wt %.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: September 15, 2009
    Assignees: Bridgestone Corporation, Taiyo Yuden Co., Ltd.
    Inventors: Osamu Okada, Toshiki Takizawa, Naruhiko Mashita, Takashi Ishiguro, Shinya Kusumi, Hiroshi Tsutagaya
  • Patent number: 7429393
    Abstract: A process that enables the formation of a high damping, soft polymer gel includes reacting a maleimide copolymer with a maleated polyalkylene and an alkyl diamine under substantially dry conditions sufficient to form a polyalkylene-grafted maleimide copolymer product which then is dispersed with an extender sufficient to form the gel. The steps can be carried out sequentially in a high shear mixer without the need for intermediate steps of cooling and grinding the reaction product of one step before proceeding to the next.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: September 30, 2008
    Assignee: Bridgestone Corporation
    Inventors: Xiaorong Wang, Victor F. Foltz, Terrence E. Hogan, William M. Cole, Naruhiko Mashita, Yuichiro Wakana, Tadashi Utsunomiya
  • Patent number: 7420012
    Abstract: The rubber composition and the material suitable for preparing the rubber composition show high gas-barrier properties and being free from inhibition of vulcanization. The rubber composition is essentially composed of a rubber and a layered mineral filler treated with short chain alkyl ammonium salt.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: September 2, 2008
    Assignee: Bridgestone Corporation
    Inventors: Isao Hagiwara, Naruhiko Mashita, Hiroki Nakano, Katsuhiko Tsunoda
  • Publication number: 20080180308
    Abstract: A radio wave absorber that can be bonded securely to a flexible cable or a flexible printed circuit board eliminates the need for a release film. A radio wave absorber comprising a thermosetting adhesive sheet 1 that is cured into a flexible material, and a Sendust-containing curable resin composition layer 2 that is cured into a flexible material, wherein the curable resin composition layer is formed on either surface of the thermosetting adhesive sheet. The average particle diameter of Sendust is in the range of 30 to 100 ?m. The content ratio of Sendust in the curable resin composition layer is in the range of 50 to 85 wt %.
    Type: Application
    Filed: September 26, 2007
    Publication date: July 31, 2008
    Applicants: BRIDGESTONE CORPORATION, TAIYO YUDEN CO., LTD.
    Inventors: Osamu OKADA, Toshiki Takizawa, Naruhiko Mashita, Takashi Ishiguro, Shinya Kusumi, Hiroshi Tsutagaya
  • Publication number: 20070112116
    Abstract: The rubber composition and the material suitable for preparing the rubber composition show high gas-barrier properties and being free from inhibition of vulcanization. The rubber composition is essentially composed of a rubber and a layered mineral filler treated with short chain alkyl ammonium salt.
    Type: Application
    Filed: June 16, 2004
    Publication date: May 17, 2007
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Isao Hagiwara, Naruhiko Mashita, Hiroki Nakano, Katsuhiko Tsunoda
  • Patent number: 7163980
    Abstract: It is an object of the present invention to provide a resin composition which has a low hardness, is favorable in high loss properties (vibration absorbing properties) and gas permeation resistance, is excellent in injection moldability, thereby enabling itself to be injection molded with stable dimensional accuracy, and which is particularly suitable for constituting an elastic member for an ink jet printer, an insulator for a recording medium drive, a gasket for an HDD and an impact absorbing material for an HDD. The above object has been achieved with a resin composition which comprises 100 parts by weight of a thermoplastic elastomer containing an isobutylenic block copolymer composed of isobutylenic polymer blocks and aromatic vinylic polymer blocks, and 1 to 50 parts by weight of a polyolefin resin.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: January 16, 2007
    Assignee: Bridgestone Corporation
    Inventors: Naruhiko Mashita, Tadashi Utsunomiya, Youkou Saito
  • Patent number: 7044475
    Abstract: A gasket integrated with a cover wherein a gasket material composed of a thermoplastic elastomer composition is integrally fixed to the cover having a shape of multistep contraction over at least two contraction steps, a gasket wherein the cover and the gasket are integrally molded and after molding, are subjected to a heating treatment at a temperature not lower than the temperature at which an adhesive component in materials constituting the gasket initiates crystal fusion or glass transition, or a gasket wherein the cover and the gasket are integrally molded and a covering layer composed of a fluoropolymer is formed on the gasket surface on atmospheric side are proposed. According to the present invention, a gasket integrated with a cover for a hard disc device which gasket is excellent in adhesive property and productivity, and is minimized in permeability and penetration of substances is provided.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: May 16, 2006
    Assignee: Bridgestone Corporation
    Inventors: Yasushi Imai, Tadashi Utsunomiya, Tomohiro Ogata, Shosan Shibata, Tatsuhiko Hosokawa, Naruhiko Mashita, Tsunehiro Yamamoto
  • Patent number: 6981762
    Abstract: The elastic member for an ink jet recording apparatus according to the present invention is formed from: (1) a thermoplastic elastomer composition comprising 100 parts by weight of (a) a hydrogenated block copolymer, 60 to 170 parts by weight of (b) a softening agent for a non-aromatic rubber and 5 to 30 parts by weight of (c) polypropylene, (2) a thermoplastic elastomer composition in which a network structure having a pore diameter of 50 ?m or less is formed, comprising 100 parts by weight of (a) a hydrogenated block copolymer, 60 to 170 parts by weight of (b) a softening agent for a non-aromatic rubber and 5 to 30 parts by weight of (c) crystalline polyolefin, or (3) a thermoplastic elastomer composition in which a shear rate dependency of a melt viscosity measured by means of a capillograph is ?1.5 to ?0.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: January 3, 2006
    Assignee: Bridgestone Corporation
    Inventors: Naruhiko Mashita, Youkou Saito, Tadashi Utsunomiya, Yasunori Fukuda, Jun Arai, Shoson Shibata
  • Publication number: 20050206093
    Abstract: The invention relates to a process for producing a gasket for hard disc equipment which is integrated with a cover member by extruding a gasket material from an extrusion orifice of a three-dimensional automatic coating controlling apparatus onto the cover member and then curing the extruded gasket material, wherein a ratio (h/w) of a height (h) of the gasket to a line width (w) of the gasket on a joint surface between the gasket and the cover member is in the range of 0.8 to 3.0 in a 80% or more portion of the gasket.
    Type: Application
    Filed: March 28, 2003
    Publication date: September 22, 2005
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tadashi Utsunomiya, Tomohiro Ogata, Youkou Saito, Naruhiko Mashita, Toshihiko Hiraiwa
  • Publication number: 20040239735
    Abstract: It is an object of the present invention to provide a resin composition which has a low hardness, is favorable in high loss properties (vibration absorbing properties) and gas permeation resistance, is excellent in injection moldability, thereby enabling itself to be injection molded with stable dimensional accuracy, and which is particularly suitable for constituting an elastic member for an ink jet printer, an insulator for a recording medium drive, a gasket for an HDD and an impact absorbing material for an HDD. The above object has been achieved with a resin composition which comprises 100 parts by weight of a thermoplastic elastomer containing an isobutylenic block copolymer composed of isobutylenic polymer blocks and aromatic vinylic polymer blocks, and 1 to 50 parts by weight of a polyolefin resin.
    Type: Application
    Filed: February 24, 2004
    Publication date: December 2, 2004
    Inventors: Naruhiko Mashita, Tadashi Utsunomiya, Youkou Saito
  • Patent number: 6824730
    Abstract: There are disclosed a resin composition which is excellent in rubber elasticity, oil maintainability and adhesivity to a metal, and comprises a thermoplastic elastomer composition comprising a (a1) hydrogenated block copolymer which is obtained by hydrogenating a block copolymer consisting essentially of a polymer block composed principally of a vinyl aromatic compound and a polymer block composed principally of a conjugated diene compound, which has a weight average molecular weight of at least 200,000, in which the polymer block composed principally of a vinyl aromatic compound is polystyrene, and in which the content by weight of the polystyrene moiety contained in the hydrogenated block copolymer is 20 to 40%; a (b1) non-aromatic rubber-softening agent having a kinematic viscosity at 40° C.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: November 30, 2004
    Assignee: Bridgestone Corporation
    Inventors: Naruhiko Mashita, Shinichi Toyosawa, Youichi Nishimuro, Yasushi Imai, Tadashi Utsunomiya, Ichiro Akasaka, Youkou Saito
  • Publication number: 20040186258
    Abstract: A crush stop comprising a thermoplastic elastomer composition which has a hardness as measured with a hardness tester type A in accordance with JIS-K-6253 being at least 50 degrees and which has dependence of elastic modulus upon temperature being at most 3 times between 0° C. and 60° C. The crush stop is minimized in the displacement due to impact of a stopper arm, and is excellent in impact absorbing properties over a wide range of temperatures.
    Type: Application
    Filed: November 10, 2003
    Publication date: September 23, 2004
    Inventors: Jun Arai, Naruhiko Mashita, Yasushi Imai, Tsunehiro Yamamoto, Tadashi Utsunomiya, Tatsuhiko Hosokawa
  • Publication number: 20040099987
    Abstract: A gasket integrated with a cover wherein a gasket material composed of a thermoplastic elastomer composition is integrally fixed to the cover having a shape of multistep contraction over at least two contraction steps, a gasket wherein the cover and the gasket are integrally molded and after molding, are subjected to a heating treatment at a temperature not lower than the temperature at which an adhesive component in materials constituting the gasket initiates crystal fusion or glass transition, or a gasket wherein the cover and the gasket are integrally molded and a covering layer composed of a fluoropolymer is formed on the gasket surface on atmospheric side are proposed. According to the present invention, a gasket integrated with a cover for a hard disc device which gasket is excellent in adhesive property and productivity, and is minimized in permeability and penetration of substances is provided.
    Type: Application
    Filed: October 10, 2003
    Publication date: May 27, 2004
    Inventors: Yasushi Imai, Tadashi Utsunomiya, Tomohiro Ogata, Shoson Shibata, Tatsuhiro Hosokawa, Naruhiko Mashita, Tsunehiro Yamamoto
  • Publication number: 20040070653
    Abstract: The elastic member for an ink jet recording apparatus according to the present invention is formed from:
    Type: Application
    Filed: November 10, 2003
    Publication date: April 15, 2004
    Inventors: Naruhiko Mashita, Youkou Saito, Tadashi Utsunomiya, Yasunori Fukuda, Jun Arai, Shoson Shibata
  • Patent number: 6663975
    Abstract: There are disclosed a resin composition (I) which comprises 100 parts by weight of (a1) a styrenic thermoplastic elastomer composed of a block copolymer (styrene-ethylene/butylene-styrene block copolymer, styrene-ethylene/propylenestyrene block copolymer), 3 to 50 parts by weight of (b1) an ethylene/(meth) acrylic acid copolymer or an ethylene/(meth)-acrylic ester copolymer each having 5 to 45% by weight of (meth)acrylic acid content, and 50 to 170 parts by weight of (c1) a paraffin base oil; a resin composition (II) which comprises 100 parts by weight of (a2) a styrenic thermoplastic elastomer composed of a block copolymer, 1 to 15 parts by weight of (b2) a maleic anhydride-grafted polyolefin, and 30 to 170 parts by weight of (c2) a paraffin base oil; a gasket material (I) composed of the components (a1), (b1) and (c1); a gasket material (II) composed of the components (a2), (b2) and (c2); and a gasketed cover in which a gasket made of the gasket material (I) or (II) is integrally fitted to a cover body made
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: December 16, 2003
    Assignee: Bridgestone Corporation
    Inventors: Shinichi Toyosawa, Youichi Nishimuro, Naruhiko Mashita, Kunio Machida
  • Publication number: 20030091527
    Abstract: A process that enables the formation of a high damping, soft polymer gel includes reacting a maleimide copolymer with a maleated polyalkylene and an alkyl diamine under substantially dry conditions sufficient to form a polyalkylene-grafted maleimide copolymer product which then is dispersed with an extender sufficient to form the gel. The steps can be carried out sequentially in a high shear mixer without the need for intermediate steps of cooling and grinding the reaction product of one step before proceeding to the next.
    Type: Application
    Filed: July 13, 2001
    Publication date: May 15, 2003
    Inventors: Xiaorong Wang, Victor F. Foltz, Terrence E. Hogan, William M. Cole, Naruhiko Mashita, Yuichiro Wakana, Tadashi Utsunomiya