Patents by Inventor Koichi Tokunaga

Koichi Tokunaga 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: 10844010
    Abstract: In a process for producing a (poly) sulfide compound represented by General Formula (2) of the present invention, thiol compounds represented by General Formula (1) are reacted with each other in the presence of a basic compound represented by General Formula (4) or General Formula (5) and sulfur.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: November 24, 2020
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Chitoshi Shimakawa, Shigetoshi Kuma, Masaru Kawaguchi
  • Patent number: 10399929
    Abstract: A manufacturing method of an amine compound including obtaining a reaction solution containing an aldehyde compound by reacting a compound represented by Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, neutralizing the reaction, purifying an aldehyde compound by distilling the neutralized reaction solution, and reacting the aldehyde compound with ammonia and with hydrogen in the presence of a catalyst to obtain an amine compound, wherein the phosphorus compound is represented by the Formula (R1O)3P, and the base compound is at least one selected from carbonate and hydrogen carbonate of metals of group I and carbonate and hydrogen carbonate of metals of group II, and wherein the neutralizing the reaction solution is performed within a temperature range of 40° C. to 50° C.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: September 3, 2019
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Naoyuki Kakinuma, Masayuki Furuya, Michiharu Sakata, Koichi Tokunaga, Shigetoshi Kuma
  • Patent number: 10399930
    Abstract: A manufacturing method of an isocyanate compound including obtaining a reaction solution containing an aldehyde compound by reacting a compound represented by Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, neutralizing the reaction solution, purifying an aldehyde compound by distilling the neutralized reaction solution, reacting the aldehyde compound with ammonia and with hydrogen in the presence of a catalyst to obtain an amine compound; and reacting the amine compound with a carbonylating agent to obtain an isocyanate compound, wherein the phosphorus compound is represented by the Formula (R1O)3P, and the base compound is at least one selected from carbonate and hydrogen carbonate of metals of group I and carbonate and hydrogen carbonate of metals of group II, wherein the neutralizing the reaction solution is performed within a temperature range of 40° C. to 50° C.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: September 3, 2019
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Naoyuki Kakinuma, Masayuki Furuya, Michiharu Sakata, Koichi Tokunaga, Shigetoshi Kuma
  • Publication number: 20190077751
    Abstract: In a process for producing a (poly) sulfide compound represented by General Formula (2) of the present invention, thiol compounds represented by General Formula (1) are reacted with each other in the presence of a basic compound represented by General Formula (4) or General Formula (5) and sulfur.
    Type: Application
    Filed: March 17, 2017
    Publication date: March 14, 2019
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Chitoshi Shimakawa, Shigetoshi Kuma, Masaru Kawaguchi
  • Publication number: 20180093944
    Abstract: A manufacturing method of an amine compound including obtaining a reaction solution containing an aldehyde compound by reacting a compound represented by Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, neutralizing the reaction, purifying an aldehyde compound by distilling the neutralized reaction solution, and reacting the aldehyde compound with ammonia and with hydrogen in the presence of a catalyst to obtain an amine compound, wherein the phosphorus compound is represented by the Formula (R1O)3P, and the base compound is at least one selected from carbonate and hydrogen carbonate of metals of group I and carbonate and hydrogen carbonate of metals of group II, and wherein the neutralizing the reaction solution is performed within a temperature range of 40° C. to 50° C.
    Type: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Naoyuki KAKINUMA, Masayuki FURUYA, Michiharu SAKATA, Koichi TOKUNAGA, Shigetoshi KUMA
  • Publication number: 20180093945
    Abstract: A manufacturing method of an isocyanate compound including obtaining a reaction solution containing an aldehyde compound by reacting a compound represented by Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, neutralizing the reaction solution, purifying an aldehyde compound by distilling the neutralized reaction solution, reacting the aldehyde compound with ammonia and with hydrogen in the presence of a catalyst to obtain an amine compound; and reacting the amine compound with a carbonylating agent to obtain an isocyanate compound, wherein the phosphorus compound is represented by the Formula (R1O)3P, and the base compound is at least one selected from carbonate and hydrogen carbonate of metals of group I and carbonate and hydrogen carbonate of metals of group II, wherein the neutralizing the reaction solution is performed within a temperature range of 40° C. to 50° C.
    Type: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Naoyuki KAKINUMA, Masayuki FURUYA, Michiharu SAKATA, Koichi TOKUNAGA, Shigetoshi KUMA
  • Patent number: 9809533
    Abstract: The purification method of an aldehyde compound of the present invention includes a step of neutralizing a reaction solution containing an aldehyde compound by adding water and a base compound to the reaction solution, and a step of distilling the neutralized reaction solution, in which the reaction solution is obtained by reacting a compound represented by the following Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, the phosphorus compound is represented by Formula (R1O)3P, and the base compound is at least one kind selected from among carbonate and hydrogen carbonate of metals of group I on the periodic table and carbonate and hydrogen carbonate of metals of group II on the periodic table.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: November 7, 2017
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Naoyuki Kakinuma, Masayuki Furuya, Michiharu Sakata, Koichi Tokunaga, Shigetoshi Kuma
  • Patent number: 9487475
    Abstract: A preparation method of an aldehyde compound of the present invention includes a step of reacting a compound represented by the following general formula (a1) with hydrogen and carbon monoxide in the presence of a metal compound including 0.01 ppmmol to 10 ppmmol of a metal belonging to Groups 8 to 10 with respect to 1 mole of the compound and a phosphorus compound, and in the step, the amount of acrylonitrile included in the compound represented by the general formula (a1) is equal to or less than 200-fold by mole with respect to 1 mole of the metal belonging to Groups 8 to 10.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: November 8, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Naoyuki Kakinuma, Shigetoshi Kuma
  • Patent number: 9475760
    Abstract: A preparation method of an aldehyde compound of the present invention includes a step of reacting the compound represented by the following general formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound including 0.01 ppmmol to 10 ppmmol of a metal belonging to Groups 8 to 10 with respect to 1 mole of the compound and a phosphorus compound, and the amount of a chlorine portion in the reaction system in the step is equal to or less than 1.5 parts by weight with respect to 1 part by weight of the metal belonging to Groups 8 to 10.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: October 25, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Naoyuki Kakinuma, Shigetoshi Kuma
  • Publication number: 20150299108
    Abstract: A preparation method of an aldehyde compound of the present invention includes a step of reacting the compound represented by the following general formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound including 0.01 ppmmol to 10 ppmmol of a metal belonging to Groups 8 to 10 with respect to 1 mole of the compound and a phosphorus compound, and the amount of a chlorine portion in the reaction system in the step is equal to or less than 1.5 parts by weight with respect to 1 part by weight of the metal belonging to Groups 8 to 10.
    Type: Application
    Filed: November 8, 2013
    Publication date: October 22, 2015
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Naoyuki Kakinuma, Shigetoshi Kuma
  • Publication number: 20150299109
    Abstract: A preparation method of an aldehyde compound of the present invention includes a step of reacting a compound represented by the following general formula (a1) with hydrogen and carbon monoxide in the presence of a metal compound including 0.01 ppmmol to 10 ppmmol of a metal belonging to Groups 8 to 10 with respect to 1 mole of the compound and a phosphorus compound, and in the step, the amount of acrylonitrile included in the compound represented by the general formula (a1) is equal to or less than 200-fold by mole with respect to 1 mole of the metal belonging to Groups 8 to 10.
    Type: Application
    Filed: November 8, 2013
    Publication date: October 22, 2015
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Koichi Tokunaga, Naoyuki Kakinuma, Shigetoshi Kuma
  • Publication number: 20150291513
    Abstract: The purification method of an aldehyde compound of the present invention includes a step of neutralizing a reaction solution containing an aldehyde compound by adding water and a base compound to the reaction solution, and a step of distilling the neutralized reaction solution, in which the reaction solution is obtained by reacting a compound represented by the following Formula (a1) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, the phosphorus compound is represented by Formula (R1O)3P, and the base compound is at least one kind selected from among carbonate and hydrogen carbonate of metals of group I on the periodic table and carbonate and hydrogen carbonate of metals of group II on the periodic table.
    Type: Application
    Filed: November 8, 2013
    Publication date: October 15, 2015
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Naoyuki Kakinuma, Masayuki Furaya, Michiharu Sakata, Koichi Tokunaga, Shigetoshi Kuma
  • Patent number: 8772441
    Abstract: A resin composition for an optical material that has excellent balance of refractive index of resin, Abbe number, heat resistance, specific gravity, and resin strength, a resin obtained by curing the resin composition, and an optical material are provided. A polymerizable composition comprising the following is used: An alicyclic isocyanate compound represented by the formula (1) and/or the formula (2): ?(In the formula (1), n represents integer of 0 to 3) ?and (a) at least one compound of the polythiol compound having at least two thiol groups in one molecule and/or the polythiol compound having at least two thiol groups and at least one (poly)sulfide bond other than the thiol group in one molecule, and (b) at least one compound of the polyhydroxy compound having at least two hydroxy groups in one molecule and/or the (poly)hydroxy(poly)mercapto compound having at least one hydroxy group and at least one thiol group.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: July 8, 2014
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Shigetoshi Kuma, Koichi Tokunaga, Hiroyuki Morijiri, Seiichi Kobayashi
  • Patent number: 8183404
    Abstract: The present invention is to provide a process for producing dicyanonorbornane characterized by causing hydrogen cyanide to undergo addition reaction with cyanonorbornene (bicyclo[2.2.1]-5-heptene-2-carbonitrile) in the presence of a zerovalent nickel complex catalyst which is produced by using a phosphite represented by P(x)(y)(z) (wherein P is a phosphorus atom, and x, y and z are each OR, where R represents an aryl group having not more than 18 carbon atoms) as a ligand to reduce a nickel halide with at least one metal selected among zinc, cadmium, beryllium, aluminum, iron and cobalt, wherein the phosphite is one which has a phosphate content of 1.0 weight % or lower based on the whole phosphite.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: May 22, 2012
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Norihiko Fukatsu, Hiroyuki Morijiri, Chitoshi Shimakawa, Koichi Tokunaga, Seiichi Kobayashi
  • Publication number: 20110245531
    Abstract: Pentaerythritol which contains none of the alkali metals and the alkaline earth metals or which contains at least one of these in a total amount of 1.0 weight % or smaller is reacted with a mercaptocarboxylic acid to produce a pentaerythritol mercaptocarboxylic acid ester.
    Type: Application
    Filed: June 15, 2011
    Publication date: October 6, 2011
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Shigetoshi KUMA, Koichi Tokunaga, Norihiko Fukatsu, Seiichi Kobayashi
  • Publication number: 20110065887
    Abstract: A process for producing pentaerythritol mercaptocarboxylic ester by reacting pentaerythritol with a mercaptocarboxylic acid having a content of thioester formed by condensation of two molecules of the acid of 5% or below (in terms of area percentage) as determined by the high-performance liquid chromatography in the case of the total area of the mercaptocarboxylic acid and thioester formed by intermolecular condensation of the acid is taken as 100%.
    Type: Application
    Filed: July 28, 2010
    Publication date: March 17, 2011
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Shigetoshi KUMA, Koichi Tokunaga, Norihiko Fukatsu, Seiichi Kobayashi
  • Patent number: 7627256
    Abstract: A wavelength division multiplexed optical signal transmission method, a wavelength division multiplexed optical signal transmission system and an optical repeater enabling the number of wavelengths to be detected without error even when optical noise is caused in the optical repeater and such functions as adjustment and monitoring of the level of a wavelength division multiplexed optical signal to be performed properly. An optical repeater processes controlled optical signals of different wavelengths individually based on a control optical signal that contains wavelength number information indicating the total number of wavelengths and the presence or absence of a controlled optical signal with respect to each wavelength. Thus, even when optical noise is caused in the optical repeater, the number of wavelengths can be detected without error and such functions as adjustment and monitoring of the level of a wavelength division multiplexed optical signal can be performed properly.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: December 1, 2009
    Assignee: NEC Corporation
    Inventor: Koichi Tokunaga
  • Publication number: 20090270583
    Abstract: Pentaerythritol which contains none of the alkali metals and the alkaline earth metals or which contains at least one of these in a total amount of 1.0 weight % or smaller is reacted with a mercaptocarboxylic acid to produce a pentaerythritol mercaptocarboxylic acid ester.
    Type: Application
    Filed: October 31, 2005
    Publication date: October 29, 2009
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Shigetoshi Kuma, Koichi Tokunaga, Norihiko Fukatsu, Seiichi Kobayashi
  • Publication number: 20090198082
    Abstract: The present invention is to provide a process for producing dicyanonorbornane characterized by causing hydrogen cyanide to undergo addition reaction with cyanonorbornene (bicyclo[2.2.1]-5-heptene-2-carbonitrile) in the presence of a zerovalent nickel complex catalyst which is produced by using a phosphite represented by P(x)(y)(z) (wherein P is a phosphorus atom, and x, y and z are each OR, where R represents an aryl group having not more than 18 carbon atoms) as a ligand to reduce a nickel halide with at least one metal selected among zinc, cadmium, beryllium, aluminum, iron and cobalt, wherein the phosphite is one which has a phosphate content of 1.0 weight % or lower based on the whole phosphite.
    Type: Application
    Filed: June 22, 2007
    Publication date: August 6, 2009
    Applicant: MITSUI CHEMICALS , INC.
    Inventors: Norihiko Fukatsu, Hiroyuki Morijiri, Chitoshi Shimakawa, Koichi Tokunaga, Seiichi Kobayashi
  • Publication number: 20070203318
    Abstract: A resin composition for an optical material that has excellent balance of refractive index of resin, Abbe number, heat resistance, specific gravity, and resin strength, a resin obtained by curing the resin composition, and an optical material are provided. A polymerizable composition comprising the following is used: An alicyclic isocyanate compound represented by the formula (1) and/or the formula (2): ?(In the formula (1), n represents integer of 0 to 3) ?and (a) at least one compound of the polythiol compound having at least two thiol groups in one molecule and/or the polythiol compound having at least two thiol groups and at least one (poly)sulfide bond other than the thiol group in one molecule, and (b) at least one compound of the polyhydroxy compound having at least two hydroxy groups in one molecule and/or the (poly)hydroxy(poly)mercapto compound having at least one hydroxy group and at least one thiol group.
    Type: Application
    Filed: February 22, 2005
    Publication date: August 30, 2007
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Shigetoshi Kuma, Koichi Tokunaga, Hiroyuki Morijiri, Seiichi Kobayashi