Patents by Inventor Goro Sawada
Goro Sawada 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).
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Publication number: 20230220138Abstract: A method of manufacturing a copolymer resin of dicyclopentadiene and a vinyl aromatic compound, by which the resin can be continuously manufactured with reduced generation of high molecular weight products of the vinyl aromatic compound and insoluble substances from dicyclopentadiene, and at high yield. The manufacturing method includes continuously injecting polymerization raw materials into a preheated solvent in the reaction system, and concurrently ejecting a part of the reaction solution containing the solvent and the polymerization raw materials outside the reaction system, while raising the temperature of the polymerization raw materials. This enables rapid rise of the temperature of the polymerization raw materials by utilizing sensible heat, resulting in reduced generation of insoluble substances. In addition, providing a reaction step following the raw material injection step allows the polymerization reaction to proceed until a desired molecular weight is achieved, resulting in improved yield.Type: ApplicationFiled: December 11, 2020Publication date: July 13, 2023Applicant: MARUZEN PETROCHEMICAL CO., LTD.Inventors: Goro SAWADA, Yoshikazu IIJIMA, Kyohei IWAMURA, Takahiro KAWATE, Shinnosuke KAGA
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Patent number: 9586927Abstract: Provided is a method for continuously producing a cyclic carbonate, by which generation of a glycol in a reaction for synthesizing a cyclic carbonate is suppressed, and a cyclic carbonate having a high purity can be efficiently obtained even by simple purification. A method for continuously producing a cyclic carbonate, including filling a catalyst in a fixed-bed tube reactor, and continuously feeding carbon dioxide and an epoxide to the fixed-bed tube reactor to thereby bringing the carbon dioxide and the epoxide into contact with the catalyst, while continuously withdrawing the reaction liquid in the fixed-bed tube reactor, wherein the method includes a pre-treatment step in which a pre-treatment liquid containing a cyclic carbonate is brought into contact with the catalyst before feeding the carbon dioxide and the epoxide to the fixed-bed tube reactor, and the generated glycol is removed out of the system.Type: GrantFiled: July 18, 2014Date of Patent: March 7, 2017Assignees: MARUZEN PETROCHEMICAL CO., LTD., National Institute of Advanced Industrial Science and TechnologyInventors: Takashi Naniki, Yasunori Hayashi, Goro Sawada, Takuro Furukawa, Takeshi Haruna, Toshikazu Takahashi, Hiroyuki Yasuda, Shouji Yamamoto
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Publication number: 20160168112Abstract: Provided is a method for continuously producing a cyclic carbonate, by which generation of a glycol in a reaction for synthesizing a cyclic carbonate is suppressed, and a cyclic carbonate having a high purity can be efficiently obtained even by simple purification. A method for continuously producing a cyclic carbonate, including filling a catalyst in a fixed-bed tube reactor, and continuously feeding carbon dioxide and an epoxide to the fixed-bed tube reactor to thereby bringing the carbon dioxide and the epoxide into contact with the catalyst, while continuously withdrawing the reaction liquid in the fixed-bed tube reactor, wherein the method includes a pre-treatment step in which a pre-treatment liquid containing a cyclic carbonate is brought into contact with the catalyst before feeding the carbon dioxide and the epoxide to the fixed-bed tube reactor, and the generated glycol is removed out of the system.Type: ApplicationFiled: July 18, 2014Publication date: June 16, 2016Applicants: MARUZEN PETROCHEMICAL CO., LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventors: Takashi NANIKI, Yasunori HAYASHI, Goro SAWADA, Takuro FURUKAWA, Takeshi HARUNA, Toshikazu TAKAHASHI, Hiroyuki YASUDA, Shouji YAMAMOTO
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Patent number: 8492483Abstract: To provide a novel ABA-type triblock copolymer of vinyl ether series, comprising polyvinyl ether and an oxystyrene-series unit, and a process of producing the ABA-type copolymer at a series of steps. The invention relates to a novel ABA-type triblock copolymer comprising Segment A comprising an oxystyrene-series repeat unit (a) and Segment B comprising a vinyl ether-series repeat unit (b), in which the Segment A and the Segment B are bonded together with a single bond, and to a simple process of producing the same. The triblock copolymer can be produced at a series of steps in a simple manner, comprising living cationic polymerization of a vinyl ether-series monomer such as ethyl vinyl ether in the presence of a bifunctional initiator and a Lewis acid, and subsequently adding an oxystyrene-series monomer such as p-hydroxystyrene for living cationic polymerization.Type: GrantFiled: June 19, 2008Date of Patent: July 23, 2013Assignee: Maruzen Petrochemical Co., Ltd.Inventors: Norihiro Yoshida, Hijiri Aoki, Takahito Mita, Ami Yamaguchi, Kazuhiko Haba, Goro Sawada
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Publication number: 20100286351Abstract: To provide a novel ABA-type triblock copolymer of vinyl ether series, comprising polyvinyl ether and an oxystyrene-series unit, and a process of producing the ABA-type copolymer at a series of steps. The invention relates to a novel ABA-type triblock copolymer comprising Segment A comprising an oxystyrene-series repeat unit (a) and Segment B comprising a vinyl ether-series repeat unit (b), in which the Segment A and the Segment B are bonded together with a single bond, and to a simple process of producing the same. The triblock copolymer can be produced at a series of steps in a simple manner, comprising living cationic polymerization of a vinyl ether-series monomer such as ethyl vinyl ether in the presence of a bifunctional initiator and a Lewis acid, and subsequently adding an oxystyrene-series monomer such as p-hydroxystyrene for living cationic polymerization.Type: ApplicationFiled: June 19, 2008Publication date: November 11, 2010Applicant: MARUZEN PETROCHEMICAL CO., LTD.Inventors: Norihiro Yoshida, Hijiri Aoki, Takahito Mita, Ami Yamaguchi, Kazuhiko Haba, Goro Sawada
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Publication number: 20030109757Abstract: The present invention provides a method for separating and recovering propargyl alcohol from a product mixture containing a solvent, water and propargyl alcohol, which alleviates the problems of prior art and which can separate and recover propargyl alcohol in a simple operation at an advantageous thermal energy without requiring a large distillation unit or a complicated separation operation or step.Type: ApplicationFiled: November 8, 2002Publication date: June 12, 2003Inventors: Hideki Omori, Goro Sawada, Hideo Fukuda, Tomohiko Sato, Mitsuru Takeuchi
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Publication number: 20030018221Abstract: The present invention provides a process for producing an acetylenediol continuously by reacting a ketone with acetylene in the presence of an alkali catalyst, which process comprises continuously feeding, into a first-stage reactor, a reaction solvent, an alkali catalyst, a ketone and acetylene to give rise to a reaction, continuously introducing the reaction mixture into a second-stage reactor, and continuously feeding a fresh portion of the same ketone into the second-stage reactor to give rise to a reaction.Type: ApplicationFiled: June 12, 2002Publication date: January 23, 2003Inventors: Hideki Omori, Goro Sawada, Hideo Fukuda, Kazuhiro Imanishi, Tomohiko Sato
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Patent number: 6506946Abstract: The present invention provides a process for producing an acetylenediol continuously by reacting a ketone with acetylene in the presence of an alkali catalyst, which process comprises continuously feeding, into a first-stage reactor, a reaction solvent, an alkali catalyst, a ketone and acetylene to give rise to a reaction, continuously introducing the reaction mixture into a second-stage reactor, and continuously feeding a fresh portion of the same ketone into the second-stage reactor to give rise to a reaction.Type: GrantFiled: June 12, 2002Date of Patent: January 14, 2003Assignee: Maruzen Petrochemical Co., Ltd.Inventors: Hideki Omori, Goro Sawada, Hideo Fukuda, Kazuhiro Imanishi, Tomohiko Sato
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Patent number: 5304692Abstract: A disproportionation catalyst for olefins and a process for disproportionation of olefins using said catalyst are disclosed. The catalyst is a mixture of one part by weight of a first catalyst component comprising silica gel carrying thereon a tungsten oxide or its precursor and a Group I metal oxide or a compound convertible to Group I metal oxide; and 8-75 parts by weight of a second catalyst component which is alumina having a specific surface area of 20-120 m.sup.2 /g, and preferably carrying thereon a Group I or Group III metal oxide or a compound convertible to such an oxide. It exhibits a remarkably extended life of disporportionation activity and is thus applicable to the industrial use. The catalyst, therefore, can produce industrially useful compounds at a low cost by the application of the olefin disproportionation.Type: GrantFiled: October 14, 1992Date of Patent: April 19, 1994Assignee: Maruzen Petrochemical Co., Ltd.Inventors: Takao Yamada, Goro Sawada, Eiji Takahashi