Patents by Inventor Tasuku Yamada

Tasuku Yamada 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: 11932785
    Abstract: The present invention provides an epoxy adhesive composition capable of reducing re-aggregation of an adhesive layer modifier, maintaining favorable viscosity for a long period of time, exhibiting high adhesiveness, and reducing process failures during application of the adhesive. Provided is an epoxy adhesive composition containing: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; an adhesive layer modifier; and an epoxy resin, the epoxy adhesive composition having a ratio of an acid-modified group equivalent of the modified polyvinyl acetal resin to an epoxy equivalent of the epoxy resin (acid-modified group equivalent/epoxy equivalent) of 5.0 to 150.0, the epoxy adhesive composition having a number ratio of the acid-modified group to an epoxy group (acid-modified group number/epoxy group number) of 0.0005 to 0.5.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: March 19, 2024
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Tasuku Yamada, Shiori Tateno, Yousuke Chiba, Takayuki Maeda, Yukio Ochitani, Hideaki Tanaka
  • Patent number: 11603456
    Abstract: The present invention provides an epoxy resin composition that is provided with flexibility to combine impact resistance and mechanical strength, while maintaining epoxy resin-specific high elastic modulus, that reduces an increase in viscosity due to mixing, and that is excellent in heat resistance, storage stability, and solvent resistance. Provided is an epoxy resin composition containing: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; a reactive diluent; and an epoxy resin, the epoxy resin composition having a sea-island phase separated structure after being cured.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: March 14, 2023
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Shiori Tateno, Tasuku Yamada, Yousuke Chiba
  • Patent number: 10961411
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can enhance adhesiveness, moisture-resistant adhesion reliability, and cooling/heating cycle reliability. An inkjet adhesive according to the present invention comprises a photocurable compound, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the compound capable of reacting with the thermosetting compound contains aromatic amine.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: March 30, 2021
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Publication number: 20210040304
    Abstract: The present invention provides an epoxy resin composition that is provided with flexibility to combine impact resistance and mechanical strength, while maintaining epoxy resin-specific high elastic modulus, that reduces an increase in viscosity due to mixing, and that is excellent in heat resistance, storage stability, and solvent resistance. Provided is an epoxy resin composition containing: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; a reactive diluent; and an epoxy resin, the epoxy resin composition having a sea-island phase separated structure after being cured.
    Type: Application
    Filed: March 26, 2019
    Publication date: February 11, 2021
    Applicant: SEKISUI CHEMICAL CO., LTD.
    Inventors: Shiori TATENO, Tasuku YAMADA, Yousuke CHIBA
  • Patent number: 10895238
    Abstract: A starter for an internal combustion engine includes a rotating shaft formed with a helical spline on an outer periphery thereof and which rotates by a rotation of a motor, a pinion gear helically splined to the rotating shaft and movable in an axial direction of the rotating shaft along a tooth surface of the helical spline, a lever receiving member disposed opposing an end surface in an axial direction of the pinion gear, moved by receiving an axial pushing force by a pushing member, and causing the pinion gear to engage with a ring gear of the internal combustion engine by a movement thereof, and a buffer member for restricting a movement of the pinion gear in a rotational direction when the pinion gear moves along the teeth surface of the helical spline.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: January 19, 2021
    Assignee: DENSO CORPORATION
    Inventors: Tatsuya Fujita, Takashi Hirabayashi, Tasuku Yamada, Mitsuhiro Murata
  • Publication number: 20210002528
    Abstract: The present invention provides an epoxy adhesive composition capable of reducing re-aggregation of an adhesive layer modifier, maintaining favorable viscosity for a long period of time, exhibiting high adhesiveness, and reducing process failures during application of the adhesive. Provided is an epoxy adhesive composition containing: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; an adhesive layer modifier; and an epoxy resin, the epoxy adhesive composition having a ratio of an acid-modified group equivalent of the modified polyvinyl acetal resin to an epoxy equivalent of the epoxy resin (acid-modified group equivalent/epoxy equivalent) of 5.0 to 150.0, the epoxy adhesive composition having a number ratio of the acid-modified group to an epoxy group (acid-modified group number/epoxy group number) of 0.0005 to 0.5.
    Type: Application
    Filed: March 11, 2019
    Publication date: January 7, 2021
    Applicant: SEKISUI CHEMICAL CO., LTD.
    Inventors: Tasuku YAMADA, Shiori TATENO, Yousuke CHIBA, Takayuki MAEDA, Yukio OCHITANI, Hideaki TANAKA
  • Patent number: 10337482
    Abstract: A starter includes a coil spring disposed between a pinion gear and a motor and a buffer rubber disposed between the pinion gear and the coil spring. When the pinion gear is subjected to a reactive force from an engine, the buffer rubber absorbs the impact. Before the impact acts on the pinion gear, the coil spring is subjected to a given initial load. When the impact acts on the pinion gear, the coil spring absorbs it transmitted through the buffer rubber. The cover in which the coil spring is stored has a flange which is held from moving to the pinion gear in response to expansion of the coil spring, while it is permitted to move to the motor in response to contraction of the coil spring. This eliminates a risk that mechanical noise occurs when the pinion gear is advanced and then brought into mesh with the engine.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: July 2, 2019
    Assignee: DENSO CORPORATION
    Inventors: Tatsuya Fujita, Takashi Hirabayashi, Tasuku Yamada
  • Patent number: 10259773
    Abstract: Provided is a curable composition for inkjet which can have a prolonged pot life even under an environment in an inkjet device that is warmed to 50° C. or higher and which can be cured into a cured product having improved heat resistance and insulation reliability, in spite of the fact that a thermally curable compound is used in the curable composition. The curable composition for inkjet according to the present invention contains a photocurable compound, a thermally curable compound, a photopolymerization initiator and a thermal curing agent and does not contain a solvent or contains the solvent, wherein the content of the solvent in 100% by weight of the curable composition is 1% by weight or less when the curable composition for inkjet contains the solvent, the photocurable compound contains a polyfunctional compound having at least two (meth)acryloyl groups, and the thermal curing agent is an aromatic amine having at least one benzene ring and at least two amino groups.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: April 16, 2019
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Mitsuru Tanikawa, Ryosuke Takahashi, Takanori Inoue, Michihisa Ueda, Tasuku Yamada, Yoshito Fujita, Takashi Watanabe, Yusuke Fujita
  • Publication number: 20190092963
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can enhance adhesiveness, moisture-resistant adhesion reliability, and cooling/heating cycle reliability. An inkjet adhesive according to the present invention comprises a photocurable compound, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the compound capable of reacting with the thermosetting compound contains aromatic amine.
    Type: Application
    Filed: November 30, 2018
    Publication date: March 28, 2019
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Patent number: 10202519
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can enhance adhesiveness, moisture-resistant adhesion reliability, and cooling/heating cycle reliability. An inkjet adhesive according to the present invention comprises a photocurable compound, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the compound capable of reacting with the thermosetting compound contains aromatic amine.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: February 12, 2019
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Patent number: 10066118
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can reduce an outgas at the time of being exposed to high temperatures, and can enhance moisture-resistant reliability. An inkjet adhesive according to the present invention comprises a first photocurable compound having one (meth)acrylol group, a second photocurable compound having two or more (meth)acrylol groups, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the first photocurable compound contains alkyl (meth)acrylate having 8 to 21 carbon atoms.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: September 4, 2018
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Publication number: 20180149130
    Abstract: A starter for an internal combustion engine includes a rotating shaft formed with a helical spline on an outer periphery thereof and which rotates by a rotation of a motor, a pinion gear helically splined to the rotating shaft and movable in an axial direction of the rotating shaft along a tooth surface of the helical spline, a lever receiving member disposed opposing an end surface in an axial direction of the pinion gear, moved by receiving an axial pushing force by a pushing member, and causing the pinion gear to engage with a ring gear of the internal combustion engine by a movement thereof, and a buffer member for restricting a movement of the pinion gear in a rotational direction when the pinion gear moves along the teeth surface of the helical spline.
    Type: Application
    Filed: November 22, 2017
    Publication date: May 31, 2018
    Applicant: DENSO CORPORATION
    Inventors: Tatsuya FUJITA, Takashi HIRABAYASHI, Tasuku YAMADA, Mitsuhiro MURATA
  • Publication number: 20180135584
    Abstract: A starter includes a coil spring disposed between a pinion gear and a motor and a buffer rubber disposed between the pinion gear and the coil spring. When the pinion gear is subjected to a reactive force from an engine, the buffer rubber absorbs the impact. Before the impact acts on the pinion gear, the coil spring is subjected to a given initial load. When the impact acts on the pinion gear, the coil spring absorbs it transmitted through the buffer rubber. The cover in which the coil spring is stored has a flange which is held from moving to the pinion gear in response to expansion of the coil spring, while it is permitted to move to the motor in response to contraction of the coil spring. This eliminates a risk that mechanical noise occurs when the pinion gear is advanced and then brought into mesh with the engine.
    Type: Application
    Filed: November 16, 2017
    Publication date: May 17, 2018
    Applicant: DENSO CORPORATION
    Inventors: Tatsuya FUJITA, Takashi HIRABAYASHI, Tasuku YAMADA
  • Publication number: 20170298005
    Abstract: Provided is a curable composition for inkjet which can have a prolonged pot life even under an environment in an inkjet device that is warmed to 50° C. or higher and which can be cured into a cured product having improved heat resistance and insulation reliability, in spite of the fact that a thermally curable compound is used in the curable composition. The curable composition for inkjet according to the present invention contains a photocurable compound, a thermally curable compound, a photopolymerization initiator and a thermal curing agent and does not contain a solvent or contains the solvent, wherein the content of the solvent in 100% by weight of the curable composition is 1% by weight or less when the curable composition for inkjet contains the solvent, the photocurable compound contains a polyfunctional compound having at least two (meth)acryloyl groups, and the thermal curing agent is an aromatic amine having at least one benzene ring and at least two amino groups.
    Type: Application
    Filed: February 12, 2016
    Publication date: October 19, 2017
    Inventors: Mitsuru Tanikawa, Ryosuke Takahashi, Takanori Inoue, Michihisa Ueda, Tasuku Yamada, Yoshito Fujita, Takashi Watanabe, Yusuke Fujita
  • Publication number: 20170233599
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can reduce an outgas at the time of being exposed to high temperatures, and can enhance moisture-resistant reliability. An inkjet adhesive according to the present invention comprises a first photocurable compound having one (meth)acrylol group, a second photocurable compound having two or more (meth)acrylol groups, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the first photocurable compound contains alkyl (meth)acrylate having 8 to 21 carbon atoms.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 17, 2017
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Publication number: 20170233615
    Abstract: Provided is an inkjet adhesive which is applied using an inkjet device, wherein the adhesive can suppress generation of voids in the adhesive layer and, after bonding, can enhance adhesiveness, moisture-resistant adhesion reliability, and cooling/heating cycle reliability. An inkjet adhesive according to the present invention comprises a photocurable compound, a photo-radical initiator, a thermosetting compound having one or more cyclic ether groups or cyclic thioether groups, and a compound capable of reacting with the thermosetting compound, and the compound capable of reacting with the thermosetting compound contains aromatic amine.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 17, 2017
    Inventors: Mitsuru Tanikawa, Takashi Watanabe, Yusuke Fujita, Yoshito Fujita, Tasuku Yamada
  • Publication number: 20150247483
    Abstract: A first distance between a position where a point-of-action end abuts at a rear end surface of a push-side abutting portion (flat washer) forming a part of holder and a rotational axis of a pinion, and a second distance between a position where the pinion abuts at a front end surface and the rotational axis of the pinion have the relation of first distance>second distance. Thereby, after starting an engine, even when the pinion is rotated at high speed, the push-side abutting portion is less likely to rotate and remains stationary relative to the lever, and even though the push-side abutting portion begins to rotate, it is rotated at a lower speed than the pinion.
    Type: Application
    Filed: March 3, 2015
    Publication date: September 3, 2015
    Inventors: Tomoya IMANISHI, Tasuku YAMADA
  • Publication number: 20150204297
    Abstract: A washer is held by being sandwiched in an axial direction by a pinion and a holder. Here, although the washer is inexpensive, it has high planar accuracy. Then, by sandwiching the washer in the axial direction between the pinion and the holder, a metal surface of the inexpensive washer with high planar accuracy can be used as a contacting surface that contacts a holder side slide-contacting surface directly. Furthermore, another metal surface of the washer can also be directly contacted to a pinion side slide-contacting surface. Thereby, wear caused by a slide-contacting rotation of the holder can be reduced without raising costs of parts and processing in the starter that adopts a pinion shift structure.
    Type: Application
    Filed: January 21, 2015
    Publication date: July 23, 2015
    Inventors: Tasuku YAMADA, Tomoya IMANISHI
  • Publication number: 20140175505
    Abstract: The present invention provides an encapsulant for optical semiconductor devices, which is capable of suppressing surface tackiness of a cured product and is also capable of enhancing the heat resistance and thermal cycle characteristics of the cured product. An encapsulant for optical semiconductor devices according to the present invention which includes: a first organopolysiloxane which is represented by formula (1A) or formula (1B) and has an alkenyl group and a methyl group bonded to a silicon atom; a second organopolysiloxane which is represented by formula (51A) or formula (51B) and has a hydrogen atom bonded to a silicon atom and a methyl group bonded to a silicon atom; and a catalyst for hydrosilylation reaction, and the content ratios of methyl groups bonded to silicon atoms in the first and second organopolysiloxanes each are 80 mol % or more.
    Type: Application
    Filed: July 11, 2012
    Publication date: June 26, 2014
    Inventors: Ryosuke Yamazaki, Mitsuru Tanikawa, Takashi Watanabe, Osamu Inui, Yoshitaka Kunihiro, Chizuru Kimu, Yusuke Kobayashi, Hidefumi Yasui, Minoru Suezaki, Yasunari Kusaka, Tasuku Yamada