Patents by Inventor Takahiro Kozuka

Takahiro Kozuka 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: 10294110
    Abstract: [Problem] To provide a novel production method for pentachlorodisilane and to obtain pentachlorodisilane having a purity of 90 mass % or more by carrying out this production method. [Solution] A production method provided with: a high-temperature reaction step in which a raw material gas containing vaporized tetrachlorosilane and hydrogen is reacted at a high temperature in order to obtain a reaction product gas containing trichlorosilane; a pentachlorodisilane generation step in which the reaction product gas obtained in the high-temperature reaction step is brought into contact with a cooling liquid obtained by circulative cooling of a condensate that is generated by cooling the reaction product gas, the reaction product gas is quickly cooled, and pentachlorodisilane is generated within the condensate; and a recovery step in which the generated pentachlorodisilane is recovered.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: May 21, 2019
    Assignees: DENKA COMPANY LIMTIED, L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE
    Inventors: Hiroyuki Yashima, Takahiro Kozuka, Seiichi Terasaki, Jean-Marc Girard
  • Publication number: 20170283267
    Abstract: [Problem] To provide a novel production method for pentachlorodisilane and to obtain pentachlorodisilane having a purity of 90 mass % or more by carrying out this production method. [Solution] A production method provided with: a high-temperature reaction step in which a raw material gas containing vaporized tetrachlorosilane and hydrogen is reacted at a high temperature in order to obtain a reaction product gas containing trichlorosilane; a pentachlorodisilane generation step in which the reaction product gas obtained in the high-temperature reaction step is brought into contact with a cooling liquid obtained by circulative cooling of a condensate that is generated by cooling the reaction product gas, the reaction product gas is quickly cooled, and pentachlorodisilane is generated within the condensate; and a recovery step in which the generated pentachlorodisilane is recovered.
    Type: Application
    Filed: September 25, 2015
    Publication date: October 5, 2017
    Applicants: Denka Company Limited, L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EX PLOITATION DES PROCEDES GEORGES CLAUDE
    Inventors: Hiroyuki YASHIMA, Takahiro KOZUKA, Seiichi TERASAKI, Jean-Marc GIRARD
  • Patent number: 9074031
    Abstract: Provided is a method of producing a polyvinyl alcohol resin, wherein the impurities in the resin are removed efficiently with a small amount of a washing liquid. A polyvinyl alcohol obtained after a polymerization step (step S1) and a saponification step (step S2) is washed with a washing liquid consisting of methyl acetate: 1 to 40 parts by mass, methanol: 50 to 98.9 parts by mass and water: 0.1 to 10 parts by mass in a washing step (step S3). The solid matter concentration of the slurry containing the washing liquid then is 1 to 30 mass %.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: July 7, 2015
    Assignee: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Satoshi Watanabe, Takahiro Kozuka
  • Patent number: 9022362
    Abstract: Provided are an apparatus for removing residual monomers and a method of producing a polyvinyl alcohol resin that can prevent drift of the organic solvent gas and residual of the polymerization solution on the trays and permits efficient removal of the unreacted monomers from the polymerization solution. An apparatus 1 for removing residual monomers having a column main body and valve trays 2 having multiple gas blowout ports each having openings only in a direction perpendicular to the flow direction of the polymerization solution 4 or openings directed downward in the flow direction of the polymerization solution, which are installed in multiple stages in the column main body is used in a monomer-removing step of removing monomers in a polymerization solution 4 by bringing an organic solvent gas, such as methanol gas, into contact with a polymerization solution 4 obtained from a polymerization reactor 3.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: May 5, 2015
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventor: Takahiro Kozuka
  • Patent number: 9023287
    Abstract: Provided is a method and an apparatus for producing a polyvinyl alcohol that can reduce energy consumption without deterioration in quality of the product polyvinyl alcohol. First, one or more vinyl esters are polymerized or a vinyl ester and other copolymerizable monomers are copolymerized to give a polyvinyl ester. Then, a raw saponification solution containing the polyvinyl ester and an organic solvent is fed through a channel 1 and a saponification catalyst-containing solution is introduced into the center of the channel. They are then mixed with static mixers 2 and the mixture 4 is subjected to saponification reaction, as it is placed on a belt 3.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: May 5, 2015
    Assignee: Denki Kagaku Kabushiki Kaisha
    Inventor: Takahiro Kozuka
  • Patent number: 8816030
    Abstract: Provided are a chloroprene rubber, a chloroprene rubber composition and the vulcanizate and formed body thereof superior in low-temperature properties. A chloroprene rubber is obtained by emulsion polymerization of raw monomers containing antiperiplanar trans-1-chlorobuta-1,3-diene and cis-1-chlorobuta-1,3-diene in a total amount of 0.5 mass % or more, 2,3-dichlorobuta-1,3-diene in an amount of 2.0 mass % or more, and the rest being chloroprene. A composition containing the chloroprene is vulcanized into a formed body.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: August 26, 2014
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Uichiro Yamagishi, Takashi Tachiyama, Takahiro Kozuka
  • Publication number: 20140058055
    Abstract: Provided are a chloroprene rubber, a chloroprene rubber composition and the vulcanizate and formed body thereof superior in low-temperature properties. A chloroprene rubber is obtained by emulsion polymerization of raw monomers containing antiperiplanar trans-1-chlorobuta-1,3-diene and cis-1-chlorobuta-1,3-diene in a total amount of 0.5 mass % or more, 2,3-dichlorobuta-1,3-diene in an amount of 2.0 mass % or more, and the rest being chloroprene. A composition containing the chloroprene is vulcanized into a formed body.
    Type: Application
    Filed: February 7, 2012
    Publication date: February 27, 2014
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Uichiro Yamagishi, Takashi Tachiyama, Takahiro Kozuka
  • Publication number: 20130005906
    Abstract: Provided are an apparatus for removing residual monomers and a method of producing a polyvinyl alcohol resin that can prevent drift of the organic solvent gas and residual of the polymerization solution on the trays and permits efficient removal of the unreacted monomers from the polymerization solution. An apparatus 1 for removing residual monomers having a column main body and valve trays 2 having multiple gas blowout ports each having openings only in a direction perpendicular to the flow direction of the polymerization solution 4 or openings directed downward in the flow direction of the polymerization solution, which are installed in multiple stages in the column main body is used in a monomer-removing step of removing monomers in a polymerization solution 4 by bringing an organic solvent gas, such as methanol gas, into contact with a polymerization solution 4 obtained from a polymerization reactor 3.
    Type: Application
    Filed: December 6, 2010
    Publication date: January 3, 2013
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Takahiro Kozuka
  • Publication number: 20130005905
    Abstract: Provided are a method and an apparatus for producing a polyvinyl alcohol that can remove unreacted monomers from the polymerization solution efficiently and reduce the amount of methanol injected. A polymerization solution obtained by polymerization of one or more vinyl esters or copolymerization of a vinyl ester with other monomers copolymerizable therewith is adjusted to a particular concentration by addition of liquid methanol and then brought into contact with methanol vapor in counter-current flow for separation into a monomer-free polymer solution and a monomer/methanol mixture. The monomer-free polymer solution is then saponified in the presence of a catalyst to give a polyvinyl alcohol.
    Type: Application
    Filed: December 6, 2010
    Publication date: January 3, 2013
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Takahiro Kozuka
  • Publication number: 20120329950
    Abstract: Provided is a method and an apparatus for producing a polyvinyl alcohol that can reduce energy consumption without deterioration in quality of the product polyvinyl alcohol. First, one or more vinyl esters are polymerized or a vinyl ester and other copolymerizable monomers are copolymerized to give a polyvinyl ester. Then, a raw saponification solution containing the polyvinyl ester and an organic solvent is fed through a channel 1 and a saponification catalyst-containing solution is introduced into the center of the channel. They are then mixed with static mixers 2 and the mixture 4 is subjected to saponification reaction, as it is placed on a belt 3.
    Type: Application
    Filed: November 12, 2010
    Publication date: December 27, 2012
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Takahiro Kozuka
  • Publication number: 20120329949
    Abstract: Provided is a method of producing a polyvinyl alcohol resin, wherein the impurities in the resin are removed efficiently with a small amount of a washing liquid. A polyvinyl alcohol obtained after a polymerization step (step S1) and a saponification step (step S2) is washed with a washing liquid consisting of methyl acetate: 1 to 40 parts by mass, methanol: 50 to 98.9 parts by mass and water: 0.1 to 10 parts by mass in a washing step (step S3). The solid matter concentration of the slurry containing the washing liquid then is 1 to 30 mass %.
    Type: Application
    Filed: October 12, 2010
    Publication date: December 27, 2012
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Satoshi Watanabe, Takahiro Kozuka
  • Patent number: 5575986
    Abstract: A compound of the following formula ##STR1## wherein m is an integer of 1 to 3, R.sub.1 and R.sub.2 are the same or different and each is hydrogen atom or lower alkyl, and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different and each is hydroxy or a group of the formula ##STR2## (wherein n is 0 or 1, X is --NH-- or --O--, Y is alkylene, A is hydrogen atom, lower alkyl, lower alkoxy, halogen atom or trifluoromethyl, and B is alkyl or alkenyl), with the proviso that two or three of R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are hydroxyl groups and that when two of them are hydroxyl groups, the cases where R.sub.3 and R.sub.5 are hydroxy, and R.sub.4 and R.sub.6 are hydroxy are excluded; a complex compound comprising said compound and a metallic atom; and a diagnostic agent containing said complex compound. The above compound is useful as a chelating agent and the complex compound comprising said compound and a metallic atom exhibits superior characteristics as a contrast medium for image diagnosis.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: November 19, 1996
    Assignee: The Green Cross Corporation
    Inventors: Fumio Mori, Tadashi Okano, Kazuki Murakami, Masakazu Shintome, Hiromichi Mukai, Ikuko Miyagi, Takashi Imagawa, Sang-Won Kim, Taro Marukawa, Takahiro Kozuka
  • Patent number: 5453264
    Abstract: A compound of the following formula ##STR1## wherein m is an integer of 1 to 3, R.sub.1 and R.sub.2 are the same or different and each is hydrogen atom or lower alkyl, and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different and each is hydroxy or a ##STR2## (wherein n is 0 or 1, X is --NH-- or --O--, Y is alkylene, A is hydrogen atom, lower alkyl, lower alkoxy, halogen atom or trifluoromethyl, and B is alkyl or alkenyl), with the proviso that two or three of R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are hydroxyl groups and that when two of them are hydroxyl groups, the cases where R.sub.3 and R.sub.5 are hydroxy, and R.sub.4 and R.sub.6 are hydroxy are excluded; a complex compound comprising said compound and a metallic atom; and a diagnostic agent containing said complex compound. The above compound is useful as a chelating agent and the complex compound comprising said compound and a metallic atom exhibits superior characteristics as a contrast medium for image diagnosis.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: September 26, 1995
    Assignee: The Green Cross Corporation
    Inventors: Fumio Mori, Tadashi Okano, Kazuki Murakami, Masakazu Shintome, Hiromichi Mukai, Ikuko Miyagi, Takashi Imagawa, Sang-Won Kim, Taro Marukawa, Takahiro Kozuka