Patents by Inventor Yukihiro Harada

Yukihiro Harada 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: 10934406
    Abstract: A prepreg tape in which reinforcing fiber bundles are impregnated with a thermosetting resin composition, wherein the prepreg tape has a tack value measured at 23° C. at a plunger push pressure of 90 kPa of 5-40 kPa, a tack value measured at 45° C. and a plunger push pressure of 150 kPa of 35-100 kPa, and a drape value at 23° C. of 10-40°, and includes unidirectional fibers arranged along the direction of length of the prepreg tape.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: March 2, 2021
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Satoshi Okamoto, Yukihiro Harada, Atsushi Nohara
  • Patent number: 10920031
    Abstract: A prepreg including: a component (A); a component (B); and a component (C), in which the component (A) is a reinforced fiber substrate, the component (B) is an epoxy resin composition, the component (C) is a component (c1) or a component (c2), the component (c1) includes polyamide particles and thermosetting polyimide particles, and the component (c2) includes spherical polyamide particles having a melting point of 140° C. to 175° C.
    Type: Grant
    Filed: September 16, 2019
    Date of Patent: February 16, 2021
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yukihiro Harada, Atsushi Nohara
  • Publication number: 20210032425
    Abstract: An epoxy resin composition for carbon-fiber-reinforced composite material includes (A) a bisphenol F-type epoxy resin that is liquid at 25° C., (B) a polyfunctional amine-type epoxy resin, and (C) 3,3?-Diaminodiphenyl sulfone. With respect to 100 parts by mass of the entire epoxy resin in the epoxy resin composition, the content of component (A) is 40 to 60 parts by mass, the content of component (B) is 30 to 45 parts by mass, and the total content of components (A) and (B) is 85 to 100 parts by mass. The content of component (C) satisfies 1.04?x/y?1.35, where x is a molar number of active hydrogen atoms in the amine of component (C) and y is a molar number of all epoxy groups in the epoxy resin composition.
    Type: Application
    Filed: October 16, 2020
    Publication date: February 4, 2021
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Yukihiro HARADA, Atsushi NOHARA
  • Patent number: 10889695
    Abstract: Provided are a tow prepreg comprising a reinforcing fiber bundle impregnated with a matrix resin composition, wherein the matrix resin composition contains a component (A) (an epoxy resin), a component (B) (dicyandiamide), a component (C) (a curing accelerator), and a component (D) (a core-shell type rubber particle), and a content of the component (D) with respect to 100 parts by mass of the component (A) is from 20 to 70 parts by mass, a viscosity is from 3 Pa·s to 80 Pa·s at 30° C., and a minimum viscosity to be obtained when a viscosity is measured by raising a temperature from room temperature to 130° C. at a rate of temperature rise of 2.0° C./min is from 0.04 Pa·s to 1 Pa·s, which exhibits excellent drape property and tackiness and less stickiness and can be unwound at a high speed; and a composite material-reinforced pressure vessel having fewer voids in a reinforcing layer which is obtainable by using the tow prepreg, a high burst pressure, and an excellent appearance due to appropriate resin flow.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: January 12, 2021
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Satoshi Okamoto, Yukihiro Harada
  • Publication number: 20200010634
    Abstract: A prepreg including: a component (A); a component (B); and a component (C), in which the component (A) is a reinforced fiber substrate, the component (B) is an epoxy resin composition, the component (C) is a component (c1) or a component (c2), the component (c1) includes polyamide particles and thermosetting polyimide particles, and the component (c2) includes spherical polyamide particles having a melting point of 140° C. to 175° C.
    Type: Application
    Filed: September 16, 2019
    Publication date: January 9, 2020
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Yukihiro HARADA, Atsushi Nohara
  • Publication number: 20190225764
    Abstract: A prepreg comprising the following constituent elements (A), (B), and (C), the constituent element (C) being present in a surface layer of the prepreg: Constituent element (A): a reinforcing fiber base material; Constituent element (B): an epoxy resin composition containing a curing agent, the epoxy resin composition being cured within the range of from 90° C. to 140° C. (inclusive); and Constituent element (C): particles of a thermoplastic resin having a melting point or a glass transition temperature within the range of from 90° C. to 140° C.
    Type: Application
    Filed: April 2, 2019
    Publication date: July 25, 2019
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yukihiro HARADA, Atsushi NOHARA
  • Patent number: 10233324
    Abstract: An epoxy resin composition, the epoxy resin composition including components (A1) to (C1) described below, wherein the content of the component (B1) is 8 to 20 parts by mass relative to 100 parts by mass of the component (A1), and the content of the component (C1) is 12 to 110 parts by mass relative to 100 parts by mass of the component (A1): component (A1): an epoxy resin; component (B1): a boron trihalide-amine complex; and component (C1): rubber particles.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: March 19, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yukihiro Harada, Satoshi Okamoto, Kenta Narumori, Tomoo Sano, Akihiro Ito, Masayuki Sugiura, Tatsuhiro Kishikawa, Shinya Katou, Sanae Kita
  • Publication number: 20180291165
    Abstract: A prepreg tape in which reinforcing fiber bundles are impregnated with a thermosetting resin composition, wherein the prepreg tape has a tack value measured at 23° C. at a plunger push pressure of 90 kPa of 5-40 kPa, a tack value measured at 45° C. and a plunger push pressure of 150 kPa of 35-100 kPa, and a drape value at 23° C. of 10-40°, and includes unidirectional fibers arranged along the direction of length of the prepreg tape.
    Type: Application
    Filed: June 11, 2018
    Publication date: October 11, 2018
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Satoshi OKAMOTO, Yukihiro HARADA, Atsushi NOHARA
  • Publication number: 20180265659
    Abstract: Provided are a tow prepreg comprising a reinforcing fiber bundle impregnated with a matrix resin composition, wherein the matrix resin composition contains a component (A) (an epoxy resin), a component (B) (dicyandiamide), a component (C) (a curing accelerator), and a component (D) (a core-shell type rubber particle), and a content of the component (D) with respect to 100 parts by mass of the component (A) is from 20 to 70 parts by mass, a viscosity is from 3 Pa·s to 80 Pa·s at 30° C., and a minimum viscosity to be obtained when a viscosity is measured by raising a temperature from room temperature to 130° C. at a rate of temperature rise of 2.0° C./min is from 0.04 Pa·s to 1 Pa·s, which exhibits excellent drape property and tackiness and less stickiness and can be unwound at a high speed; and a composite material-reinforced pressure vessel having fewer voids in a reinforcing layer which is obtainable by using the tow prepreg, a high burst pressure, and an excellent appearance due to appropriate resin flow.
    Type: Application
    Filed: May 23, 2018
    Publication date: September 20, 2018
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Satoshi OKAMOTO, Yukihiro HARADA
  • Patent number: 9701815
    Abstract: A resin composition that has good heat resistance and handleability and that can produce a prepreg which has a good balance between tackyness and drapability and which causes little resin flow during prepreg molding, a prepreg that is manufactured using the resin composition, and a fiber-reinforced composite are provided. A resin composition that contains a maleimide compound, diallyl bisphenol A, and a diallyl isophthalate polymer, a prepreg in which reinforcing fibers are impregnated with the resin composition, and a fiber-reinforced composite material that is obtained by molding the prepreg are provided.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: July 11, 2017
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yukihiro Harada, Manabu Kaneko, Tomoo Sano, Kazutami Mitani
  • Publication number: 20170130017
    Abstract: A tow prepreg, made by impregnating a reinforcing fiber bundle with a matrix resin composition that comprises component (A): epoxy resin, component (B): epoxy resin curing agent, and component (C?): pre-gelatinizing agent with a minimum viscosity temperature of 110° C. or lower, wherein, the temperature of minimum viscosity is determined to be the temperature obtained at the minimum viscosity that appears on the highest temperature side when a sample is prepared by adding and dispersing homogeneously 10 parts by mass of the component (C?) to 100 parts by mass of bisphenol-A epoxy resin with an epoxy equivalent weight of 190±6 g/eq, and by dissolving 10 parts by mass of a boron trichloride-octylamine complex into the mixture, and when the viscosity of the sample is measured by increasing the temperature at a rate of 2° C./min.
    Type: Application
    Filed: June 30, 2015
    Publication date: May 11, 2017
    Applicant: Mitsubishi Rayon Co., Ltd.
    Inventors: Satoshi OKAMOTO, Yukihiro HARADA, Toru KONDO
  • Patent number: 9388773
    Abstract: An EGR valve includes a housing formed with a passage, a valve seat provided in the passage, a valve element seatable on the valve seat, a valve stem provided with the valve element at an end, and an actuator for making stroke movement of the valve stem. The valve element is moved together with the valve stem with respect to the valve seat to change an open area of a measuring section, thereby changing an opening degree of the valve element, to adjust a flow rate of EGR gas in the passage. The EGR valve has high-resolution flow-rate characteristics in a low opening region of the valve element and large flow-rate characteristics in a high opening region. The valve element and the valve seat have predetermined shapes to cause the flow-rate characteristics in the low opening region to change in a curve without a step.
    Type: Grant
    Filed: October 16, 2014
    Date of Patent: July 12, 2016
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Eiji Nakamura, Yukihiro Harada, Mamoru Yoshioka
  • Publication number: 20150148451
    Abstract: An epoxy resin composition, the epoxy resin composition including components (A1) to (C1) described below, wherein the content of the component (B1) is 8 to 20 parts by mass relative to 100 parts by mass of the component (A1), and the content of the component (C1) is 12 to 110 parts by mass relative to 100 parts by mass of the component (A1): component (A1): an epoxy resin; component (B1): a boron trihalide-amine complex; and component (C1): rubber particles.
    Type: Application
    Filed: June 5, 2013
    Publication date: May 28, 2015
    Applicant: MITSUBISHI RAYON CO., LTD.
    Inventors: Yukihiro Harada, Satoshi Okamoto, Kenta Narumori, Tomoo Sano, Akihiro Ito, Masayuki Sugiura, Tatsuhiro Kishikawa, Shinya Katou, Sanae Kita
  • Publication number: 20150128915
    Abstract: An EGR valve includes a housing formed with a passage, a valve seat provided in the passage, a valve element seatable on the valve seat, a valve stem provided with the valve element at an end, and an actuator for making stroke movement of the valve stem. The valve element is moved together with the valve stem with respect to the valve seat to change an open area of a measuring section, thereby changing an opening degree of the valve element, to adjust a flow rate of EGR gas in the passage. The EGR valve has high-resolution flow-rate characteristics in a low opening region of the valve element and large flow-rate characteristics in a high opening region. The valve element and the valve seat have predetermined shapes to cause the flow-rate characteristics in the low opening region to change in a curve without a step.
    Type: Application
    Filed: October 16, 2014
    Publication date: May 14, 2015
    Inventors: Eiji NAKAMURA, Yukihiro HARADA, Mamoru YOSHIOKA
  • Publication number: 20130122768
    Abstract: A resin composition that has good heat resistance and handleability and that can produce a prepreg which has a good balance between tackyness and drapability and which causes little resin flow during prepreg molding, a prepreg that is manufactured using the resin composition, and a fiber-reinforced composite are provided. A resin composition that contains a maleimide compound, diallyl bisphenol A, and a diallyl isophthalate polymer, a prepreg in which reinforcing fibers are impregnated with the resin composition, and a fiber-reinforced composite material that is obtained by molding the prepreg are provided.
    Type: Application
    Filed: July 26, 2011
    Publication date: May 16, 2013
    Applicant: MITSUBISHI RAYON CO., LTD.
    Inventors: Yukihiro Harada, Manabu Kaneko, Tomoo Sano, Kazutami Mitani
  • Publication number: 20090101852
    Abstract: A passage switching valve includes a lower actuator and an upper actuator. the lower actuator includes a case, a diaphragm, an operating rod, and a spring. A lower end of the operating rod is connected to a valve element. The upper actuator includes a case, a diaphragm, an operating rod, and a spring. An upper end of the lower operating rod is abuttable on a lower end of the upper operating rod. The upper pressure chamber and the lower negative pressure chamber are communicated with each other. Each of the negative pressure chambers of the actuators is to be supplied with negative pressure. Each of the operating rods is held against vibration by a bush. The lower spring is set to be greater in urging force than the upper spring.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 23, 2009
    Applicant: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Yukihiro Harada, Yasuhiro Tsuzuki