Patents by Inventor Kouhei Takemura

Kouhei Takemura 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: 11186673
    Abstract: The purpose of the present invention is to appropriately control the rate of polymerization of a composition in which a thiol compound and an isocyanate compound are added to an episulfide compound and thereby provide an optical material which has high transparency. This composition for use as optical material comprises (a) an episulfide compound, (b) an isocyanate compound, (c) a thiol compound, and (d) a benzyl halide compound represented by formula (1): wherein: X is a halogen; L is selected from the group consisting of a hydrogen atom, a methyl group, a halogen, a mercaptomethyl group, and an isocyanate methyl group; and n is 1 or 2.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: November 30, 2021
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kazuki Kariyazono, Takashi Aoki, Kouhei Takemura, Kikuo Furukawa
  • Publication number: 20210340129
    Abstract: Provided is a composition for optical materials that gives optical materials which can have at least one improved property selected from among satisfactory mold releasability after polymerization and curing, unsusceptibility to separation from the mold during polymerization and curing, transparency, and low-level striae. The present invention further provides a compound represented by formula (1). The composition for optical materials comprises the compound represented by formula (1) and a compound represented by formula (2). (In formula (1), X1 and X2 represent O or S, provided that both X1 and X2 are O or that X1 is O and X2 is S.
    Type: Application
    Filed: June 27, 2019
    Publication date: November 4, 2021
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei TAKEMURA, Yousuke IMAGAWA, Hiroshi HORIKOSHI
  • Publication number: 20210292297
    Abstract: The present invention makes it possible to provide a compound represented by formula (1) and a composition for an optical material containing this compound. (Where m+n=4, m represents an integer of from 0 to 3, and n represents an integer of from 1 to 4.) In addition, the present invention makes it possible to provide a method for producing an optical material, the method including a step for adding 0.0001-10 parts by mass of a polymerization catalyst per 100 parts by mass of the composition for an optical material, polymerizing, and curing.
    Type: Application
    Filed: August 1, 2019
    Publication date: September 23, 2021
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei TAKEMURA, Hiroshi HORIKOSHI
  • Patent number: 11078363
    Abstract: Provided an optical material composition which makes it possible to design an optical material exhibiting a broad range of properties. This optical material composition contains a compound (A) represented by formula (1) and a polythiol (a), and does not contain 1,2,3,5,6-pentathiepane (b).
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: August 3, 2021
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Yoshihiko Nishimori, Yosuke Imagawa, Kouhei Takemura, Hiroshi Horikoshi, Yoshiaki Yamamoto
  • Patent number: 10982094
    Abstract: Provided is an optical material composition which makes it possible to design an optical material exhibiting a broad range of properties. This optical material composition contains a compound (A) represented by formula (1), 1,2,3,5,6-pentathiepane (b), and if necessary, a compound (B) represented by formula (2). The content of the compound (B) constitutes 0-30 mass % of the total mass of the composition: (In the formula, n m represents an integer which is 0-4, and n represents an integer which is 0-2).
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: April 20, 2021
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Yoshihiko Nishimori, Yosuke Imagawa, Kouhei Takemura, Hiroshi Horikoshi, Yoshiaki Yamamoto
  • Publication number: 20210009553
    Abstract: The present invention enables provision of a production method for 1,2,3,5,6-pentathiepane, the method comprising, in the following order, step A for reacting a trithiocarbonate, sulfur, and a methane dihalide together using a phase-transfer catalyst in a multilayer system having a water layer and an organic layer, step B for separating the water layer from the organic layer, and step C for stopping the reaction using an acid.
    Type: Application
    Filed: March 5, 2019
    Publication date: January 14, 2021
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Hiroyuki TANAGI, Kouhei TAKEMURA, Hiroshi HORIKOSHI
  • Publication number: 20200392323
    Abstract: An air management system component containing a crosslinked fluoroelastomer layer obtained by crosslinking a fluoroelastomer composition that contains a peroxide-crosslinkable fluoroelastomer and a hydrotalcite compound. Also disclosed is the fluoroelastomer composition.
    Type: Application
    Filed: November 5, 2018
    Publication date: December 17, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kouhei TAKEMURA, Yusuke KAMIYA
  • Publication number: 20200223975
    Abstract: The purpose of the present invention is to appropriately control the rate of polymerization of a composition in which a thiol compound and an isocyanate compound are added to an episulfide compound and thereby provide an optical material which has high transparency. This composition for use as optical material comprises (a) an episulfide compound, (b) an isocyanate compound, (c) a thiol compound, and (d) a benzyl halide compound represented by formula (1): wherein: X is a halogen; L is selected from the group consisting of a hydrogen atom, a methyl group, a halogen, a mercaptomethyl group, and an isocyanate methyl group; and n is 1 or 2.
    Type: Application
    Filed: February 26, 2018
    Publication date: July 16, 2020
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kazuki KARIYAZONO, Takashi AOKI, Kouhei TAKEMURA, Kikuo FURUKAWA
  • Publication number: 20200216616
    Abstract: Provided an optical material composition which makes it possible to design an optical material exhibiting a broad range of properties. This optical material composition contains a compound (A) represented by formula (1) and a polythiol (a), and does not contain 1,2,3,5,6-pentathiepane (b).
    Type: Application
    Filed: February 6, 2018
    Publication date: July 9, 2020
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Yoshihiko NISHIMORI, Yosuke IMAGAWA, Kouhei TAKEMURA, Hiroshi HORIKOSHI, Yoshiaki YAMAMOTO
  • Publication number: 20200024450
    Abstract: Provided is an optical material composition which makes it possible to design an optical material exhibiting a broad range of properties. This optical material composition contains a compound (A) represented by formula (1), 1,2,3,5,6-pentathiepane (b), and if necessary, a compound (B) represented by formula (2). The content of the compound (B) constitutes 0-30 mass % of the total mass of the composition: (In the formula, n m represents an integer which is 0-4, and n represents an integer which is 0-2).
    Type: Application
    Filed: February 6, 2018
    Publication date: January 23, 2020
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Yoshihiko NISHIMORI, Yosuke IMAGAWA, Kouhei TAKEMURA, Hiroshi HORIKOSHI, Yoshiaki YAMAMOTO
  • Patent number: 10047043
    Abstract: According to the present invention, it is possible to provide a polythiol composition, which comprises a polythiol (A) represented by formula (1) and a thiol compound (B) represented by formula (2). (In formula (1), p and q each independently represent an integer of 1 to 3.) (In formula (2), p and q each independently represent an integer of 1 to 3.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: August 14, 2018
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei Takemura, Takashi Aoki
  • Publication number: 20180079719
    Abstract: According to the present invention, it is possible to provide a polythiol composition, which comprises a polythiol (A) represented by formula (1) and a thiol compound (B) represented by formula (2). (In formula (1), p and q each independently represent an integer of 1 to 3.) (In formula (2), p and q each independently represent an integer of 1 to 3.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 22, 2018
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei TAKEMURA, Takashi AOKI
  • Patent number: 9914799
    Abstract: According to the present invention, a composition for an optical material can be provided, which is characterized by containing an episulfide compound having a value of turbidity in acetone of 3.0 ppm or less. According to a preferred embodiment of the present invention, a composition for an optical material can be provided, which comprises: (a) a compound (an episulfide compound) which has a structure represented by formula (1) and has a value of turbidity in acetone of 3.0 ppm or less; (b) a polyisocyanate compound; and (c) a polythiol compound. (In the formula, m represents an integer of 0 to 4; and n represents an integer of 0 or 1.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: March 13, 2018
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei Takemura, Tetsuya Konishi, Takashi Aoki, Hiroshi Horikoshi
  • Publication number: 20170197389
    Abstract: The present invention aims to provide a laminate including a fluororubber layer and an acrylic rubber layer which are firmly bonded to each other and are not separated even at high temperatures. The laminate of the present invention includes a fluororubber layer and an acrylic rubber layer. The fluororubber layer is formed from a fluororubber composition containing a fluororubber that contains a polyol-crosslinkable vinylidene fluoride unit, a polyol crosslinker, and a crosslinking accelerator. The crosslinking accelerator is a quaternary phosphonium salt free from a chlorine atom. The fluororubber has an acid value of 0.20 KOHmg/g or higher.
    Type: Application
    Filed: July 13, 2015
    Publication date: July 13, 2017
    Applicants: ZEON CORPORATION, DAIKIN INDUSTRIES, LTD.
    Inventors: Nobuyoshi EMORI, Takanori ARAKAWA, Kouhei TAKEMURA, Sadashige IRIE
  • Patent number: 9663618
    Abstract: Provided is an optical material composition, with which an optical material is obtained having excellent quality such as excellent color tone and lightfastness, a low level of striae, and high transparency when polymerization-cured. Through use of the optical material composition, which includes a compound represented by formula (1) and an episulfide compound represented by formula (2), the ratio of the compound represented by formula (1) to the combined total amount of the compound represented by formula (1) and the episulfide compound represented by formula (2) being 0.001-5.0% by mass, it is possible to provide an optical material composition for manufacturing an optical material having a high refractive index, the optical material having excellent quality such as transparency, striae, color tone, and lightfastness. (In the formula, m represents an integer of 0-4, and n represents an integer of 0-2.
    Type: Grant
    Filed: March 1, 2016
    Date of Patent: May 30, 2017
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei Takemura, Takashi Aoki
  • Publication number: 20170051095
    Abstract: According to the present invention, a composition for an optical material can be provided, which is characterized by containing an episulfide compound having a value of turbidity in acetone of 3.0 ppm or less. According to a preferred embodiment of the present invention, a composition for an optical material can be provided, which comprises: (a) a compound (an episulfide compound) which has a structure represented by formula (1) and has a value of turbidity in acetone of 3.0 ppm or less; (b) a polyisocyanate compound; and (c) a polythiol compound. (In the formula, m represents an integer of 0 to 4; and n represents an integer of 0 or 1.
    Type: Application
    Filed: April 10, 2015
    Publication date: February 23, 2017
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei TAKEMURA, Tetsuya KONISHI, Takashi AOKI, Hiroshi HORIKOSHI
  • Publication number: 20160355641
    Abstract: Provided is an optical material composition, with which an optical material is obtained having excellent quality such as excellent color tone and lightfastness, a low level of striae, and high transparency when polymerization-cured. Through use of the optical material composition, which includes a compound represented by formula (1) and an episulfide compound represented by formula (2), the ratio of the compound represented by formula (1) to the combined total amount of the compound represented by formula (1) and the episulfide compound represented by formula (2) being 0.001-5.0% by mass, it is possible to provide an optical material composition for manufacturing an optical material having a high refractive index, the optical material having excellent quality such as transparency, striae, color tone, and lightfastness. (In the formula, m represents an integer of 0-4, and n represents an integer of 0-2.
    Type: Application
    Filed: March 1, 2016
    Publication date: December 8, 2016
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei TAKEMURA, Takashi AOKI
  • Patent number: 9322476
    Abstract: The present invention provides a vehicle engine oil seal having excellent sliding properties over the entire rotation range of engines from a low rotation range to a high rotation range. The present invention is a vehicle engine oil seal comprising: an elastic member with a seal lip portion having at least a main lip portion, wherein the elastic member is formed of a composition containing a fluororubber and a fluororesin and has projecting portions at least on a surface of the main lip portion, the projecting portions being substantially formed of the fluororesin contained in the composition, the fluororesin is a copolymer including a polymerization unit derived from ethylene and a polymerization unit derived from tetrafluoroethylene, and the fluororubber is a polymer including a polymerization unit derived from vinylidene fluoride.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: April 26, 2016
    Assignees: HONDA MOTOR CO., LTD., DAIKIN INDUSTRIES, LTD.
    Inventors: Hidetaka Ogishi, Tetsuya Mizone, Kouhei Takemura, Tomihiko Yanagiguchi
  • Patent number: 9322957
    Abstract: A method for producing an optical material includes a predetermined compound (a), compound (b), compound (c), compound (d), and compound (e). The method minimizes the occurrence of a defect where peeling traces are left on a lens. The first to the fifth step minimizes the defect where peeling traces are left. First: dissolving the compound (b) into the compound (a) to obtain a first solution. Second: adding the compound (e) to the first solution obtained in the first step and then mixing to obtain a second solution not comprising the compound (d). Third: adding the compound (c) to the second solution obtained in the second step to obtain a reaction mixture. Fourth: adding the compound (d) to the reaction mixture obtained in the third step and then mixing to obtain a resin composition for an optical material. Fifth: cast-molding the resin composition and then polymerizing to obtain the optical material.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: April 26, 2016
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kouhei Takemura, Hiroyuki Okada, Hiroshi Horikoshi
  • Patent number: 9322477
    Abstract: The present invention provides a vehicle transmission having excellent sliding properties over the entire speed range of engines from a low speed range to a high speed range. The present invention is a vehicle transmission oil seal comprising: an elastic member with a seal lip portion having at least a main lip portion, wherein the elastic member is formed of a composition containing a fluororubber and a fluororesin and has projecting portions at least on a surface of the main lip portion, the projecting portions being substantially formed of the fluororesin contained in the composition, the fluororesin is a copolymer including a polymerization unit derived from ethylene and a polymerization unit derived from tetrafluoroethylene, and the fluororubber is a polymer including a polymerization unit derived from vinylidene fluoride.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: April 26, 2016
    Assignees: HONDA MOTOR CO., LTD., DAIKIN INDUSTRIES, LTD.
    Inventors: Hidetaka Ogishi, Tetsuya Mizone, Kouhei Takemura, Tomihiko Yanagiguchi