Patents by Inventor Kazuyuki Obuchi
Kazuyuki Obuchi 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).
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Patent number: 11322269Abstract: An electroconductive film including a resin layer and an electroconductive layer, wherein the resin layer has a storage elastic modulus at 25° C. of more than 10 MPa and less than 1,000 MPa, and the electroconductive layer has a surface resistance value of 1,000 ?/sq. or less.Type: GrantFiled: June 23, 2017Date of Patent: May 3, 2022Assignee: ZEON CORPORATIONInventors: Kenichi Harai, Satoshi Tazaki, Kazuyuki Obuchi
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Patent number: 10549514Abstract: An optical film including, in this order: a first layer containing a hydrogenated product of an aromatic vinyl compound-conjugated diene compound block copolymer; a second layer containing a norbornene-based polymer; and a third layer containing a hydrogenated product of an aromatic vinyl compound-conjugated diene compound block copolymer. Preferably, the hydrogenated product of the aromatic vinyl compound-conjugated diene compound block copolymer is a hydrogenated product of a styrene-isoprene copolymer. Preferably, a copolymerization ratio of styrene/isoprene in the hydrogenated product of the styrene-isoprene copolymer is 50/50 to 90/10.Type: GrantFiled: March 22, 2016Date of Patent: February 4, 2020Assignee: ZEON CORPORATIONInventors: Kazuyuki Obuchi, Taku Hatano
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Publication number: 20190139673Abstract: An electroconductive film including a resin layer and an electroconductive layer, wherein the resin layer has a storage elastic modulus at 25° C. of more than 10 MPa and less than 1,000 MPa, and the electroconductive layer has a surface resistance value of 1,000 ?/sq. or less.Type: ApplicationFiled: June 23, 2017Publication date: May 9, 2019Applicant: ZEON CORPORATIONInventors: Kenichi HARAI, Satoshi TAZAKI, Kazuyuki OBUCHI
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Publication number: 20180065348Abstract: An optical film including, in this order: a first layer containing a hydrogenated product of an aromatic vinyl compound-conjugated diene compound block copolymer; a second layer containing a norbornene-based polymer; and a third layer containing a hydrogenated product of an aromatic vinyl compound-conjugated diene compound block copolymer. Preferably, the hydrogenated product of the aromatic vinyl compound-conjugated diene compound block copolymer is a hydrogenated product of a styrene-isoprene copolymer. Preferably, a copolymerization ratio of styrene/isoprene in the hydrogenated product of the styrene-isoprene copolymer is 50/50 to 90/10.Type: ApplicationFiled: March 22, 2016Publication date: March 8, 2018Applicant: ZEON CORPORATIONInventors: Kazuyuki OBUCHI, Taku HATANO
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Publication number: 20170355128Abstract: Provided is production of a resin film excellent in all of the folding resistance, the low water-absorption property, and the heat resistance. A resin film formed of a resin containing an alicyclic structure-containing polymer having crystallizability, the resin film having a folding endurance of 2,000 times or more, a water-absorption rate of 0.1% or less, and a heat-resistant temperature of 180° C. or higher; a resin film formed of a resin containing an alicyclic structure-containing polymer having crystallizability, the resin film having a crystallinity degree of the alicyclic structure-containing polymer of 10% or more, a folding endurance of 2,000 times or more, and a water-absorption rate of 0.1% or less, and a smooth surface; and production method thereof.Type: ApplicationFiled: October 14, 2015Publication date: December 14, 2017Applicant: ZEON CORPORATIONInventors: Kazuyuki OBUCHI, Taku HATANO, Kyosuke INOUE, Hiromu MASHIMA
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Publication number: 20080153008Abstract: The present invention is to provide an optical element in which both a good light diffusion performance and a good light transmittance are achieved and which is less subject to environmental influence, a method for production thereof and a display device using the optical element. An optical element including a molded body containing a resin having an alicyclic structure, wherein a fine hologram surface diffusion pattern has been precisely formed is provided. It is preferable that the optical element is a light diffusion plate or a light diffusion sheet. Further, it is preferable that the optical element is a molded body made by injection-molding.Type: ApplicationFiled: February 17, 2005Publication date: June 26, 2008Inventors: Masahiko Hayashi, Toshiaki Suzuki, Keisuke Tsukada, Akiyoshi Shibuya, Satoshi Tazaki, Kazuyuki Obuchi
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Patent number: 7357973Abstract: A flat plate made of a cycloolefin polymer comprising at least 30% by weight, based on the cycloolefin polymer, of repeating units (A) having an alicyclic structure. The repeating units (A) comprises at least 30% by weight, based on the repeating units (A), of repeating units (A-i) having no norbornane structure. The cycloolefin polymer has a weight average molecular weight of 5,000 to 50,000. The flat plate is especially useful as a light guide plate.Type: GrantFiled: October 25, 2004Date of Patent: April 15, 2008Assignee: Nippon Zeon Co., Ltd.Inventors: Kazuyuki Obuchi, Teruhiko Suzuki, Kenji Otoi
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Publication number: 20070222092Abstract: Molds for injection molding a light guide plate in which a plurality of pin gates and/or film gates for injecting a melted resin material for molding into the cavity portion are formed at portions corresponding to the side portions of the product, a room for balancing flow having an ear shaped portion to which the material is supplied is disposed between each gate and a sprue or a runner, and the area of each gate is set so that the temperature of the material introduced into the cavity is higher than that supplied to each room by at least 5° C. due to heat generated from shearing when the material passes through the gate; and a process for producing a light guide plate using the molds. Formation of weld lines, sink marks, flow marks and warp is suppressed, and a product exhibiting excellent quality without the necessity of steps of gate cutting and finishing can be obtained.Type: ApplicationFiled: March 28, 2005Publication date: September 27, 2007Inventors: Masahiko Hayashi, Kazunori Ueki, Satoshi Tazaki, Kazuyuki Obuchi
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Publication number: 20070200263Abstract: A light diffusion plate obtained by injection molding of a thermoplastic resin and having an approximately rectangular shape having a length of a diagonal line of 400 mm or longer, wherein the fluctuation in the thickness is 200 ?m or smaller, the warp is 2 mm or smaller, the fluctuation in the transmittance is 8% or smaller and the dispersion in the y-value of the reflected light is 0.004 or smaller, and a process for producing the light diffusion plate are provided. The light diffusion plate exhibits the high luminance and the small unevenness in the luminance and provides a display of images having an excellent quality on liquid display devices.Type: ApplicationFiled: March 10, 2005Publication date: August 30, 2007Inventors: Satoshi Tazaki, Kohei Arakawa, Kazuyuki Obuchi, Keisuke Tsukada, Naoki Murata
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Publication number: 20050112329Abstract: A flat plate made of a cycloolefin polymer comprising at least 30% by weight, based on the cycloolefin polymer, of repeating units (A) having an alicyclic structure. The repeating units (A) comprises at least 30% by weight, based on the repeating units (A), of repeating units (A-i) having no norbornane structure. The cycloolefin polymer has a weight average molecular weight of 5,000 to 50,000. The flat plate is especially useful as a light guide plate.Type: ApplicationFiled: October 25, 2004Publication date: May 26, 2005Inventors: Kazuyuki Obuchi, Teruhiko Suzuki, Kenji Otoi
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Patent number: 6835440Abstract: A light guide plate of the present invention is characterized by being obtained by melt molding a thermoplastic resin having a melt flow rate of at least 50 [g/10 min.] under a load of 2.16 kgf at 280° C. The thermoplastic resin is preferably a thermoplastic resin containing an alicyclic structure, more preferably a norbornene-based polymer.Type: GrantFiled: September 18, 2001Date of Patent: December 28, 2004Assignee: Nippon Zeon Co., Ltd.Inventors: Yuichiro Konishi, Kazuyuki Obuchi, Tatsuo Miyazaki, Issei Ishimaru
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Patent number: 6828007Abstract: A flat plate made of a cycloolefin polymer comprising at least 30% by weight, based on the cyclopolefin polymer, of repeating units (A) having an alicyclic structure. The repeating units (A) comprises at least 30% by weight, based on the repeating units (A), of repeating units (A-i) having no norbornane structure. The cycloolefin polymer has a weight average molecular weight of 5,000 to 50,000. The flat plate is especially useful as a light guide plate.Type: GrantFiled: September 24, 2002Date of Patent: December 7, 2004Assignee: Nippon Zeon Co., Ltd.Inventors: Kazuyuki Obuchi, Teruhiko Suzuki, Kenji Otoi
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Publication number: 20030059575Abstract: A flat plate made of a cycloolefin polymer comprising at least 30% by weight, based on the cyclopolefin polymer, of repeating units (A) having an alicyclic structure. The repeating units (A) comprises at least 30% by weight, based on the repeating units (A), of repeating units (A-i) having no norbornane structure. The cycloolefin polymer has a weight average molecular weight of 5,000 to 50,000. The flat plate is especially useful as a light guide plate.Type: ApplicationFiled: September 24, 2002Publication date: March 27, 2003Applicant: NIPPON ZEON CO., LTD.Inventors: Kazuyuki Obuchi, Teruhiko Suzuki, Kenji Otoi
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Patent number: 6511756Abstract: A thermoplastic dicyclopentadiene ring-opening polymer obtained by ring-opening polymerization of a monomer component containing a dicyclopentadiene monomer, characterized in that polycyclic rings which are repeating units of the polymer are bonded in cis-position relative to the carbon-carbon double bond of the main chain of the polymer in 50 mol % or more of the repeating units based on the total repeating units and the content of a low-molecular weight component of 2,000 or less in molecular weight is 10% by weight or less based on the total polymer components, and a hydrogenation product obtained by hydrogenating the carbon-carbon unsaturated bond of the thermoplastic dicyclopentadiene ring-opening polymer.Type: GrantFiled: April 24, 2000Date of Patent: January 28, 2003Assignee: Nippon Zeon Co., Ltd.Inventors: Kazuyuki Obuchi, Masaharu Tokoro, Teruhiko Suzuki, Hajime Tanisho, Kenji Otoi
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Patent number: 6497939Abstract: A flat plate made of a cycloolefin polymer comprising at least 30% by weight, based on the cyclopolefin polymer, of repeating units (A) having an alicyclic structure. The repeating units (A) comprises at least 30% by weight, based on the repeating units (A), of repeating units (A-i) having no norbornane structure. The cycloolefin polymer has a weight average molecular weight of 5,000 to 50,000. The flat plate is especially useful as a light guide plate.Type: GrantFiled: February 3, 1999Date of Patent: December 24, 2002Assignee: Nippon Zeon Co., Ltd.Inventors: Kazuyuki Obuchi, Teruhiko Suzuki, Kenji Otoi