Patents by Inventor Toshio Akima
Toshio Akima 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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Patent number: 7241816Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 volt % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: GrantFiled: July 30, 2004Date of Patent: July 10, 2007Assignee: Hitachi Chemical Co., Ltd.Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Publication number: 20070093563Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 vol % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: ApplicationFiled: December 7, 2006Publication date: April 26, 2007Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Publication number: 20070082960Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 vol % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: ApplicationFiled: December 7, 2006Publication date: April 12, 2007Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Publication number: 20050187307Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, styrene monomers are added to be adsorbed to styrene resin particles in the course of polymerization, while the concentration of oxygen in a reaction vessel is kept at 7 vol % or lower in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with pentane as a foaming agent. The molecular weight in the outside of the particles obtained is selectively higher. The impregnation of pentane enables the particle to have low VOC (low volatile organic compound) properties. Furthermore the expanded particles have excellent appearance and strength since the outside thereof has a high molecular weight.Type: ApplicationFiled: November 12, 2004Publication date: August 25, 2005Inventors: Makoto Kunimi, Tetsuya Katou, Toshio Akima
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Publication number: 20050004241Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 volt % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: ApplicationFiled: July 30, 2004Publication date: January 6, 2005Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Patent number: 6797733Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 vol % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: GrantFiled: May 7, 2003Date of Patent: September 28, 2004Assignee: Hitachi Chemical Co., Ltd.Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Publication number: 20030212156Abstract: A process of producing expandable styrene resin particles, wherein in suspension polymerization of styrene monomers, the concentration of oxygen in a reaction vessel is kept low at least in a late stage of the polymerization, and the resulting styrene resin particles are impregnated with an expanding agent before or after completion of the polymerization. Preferably, at a polymerization rate of 60% or higher, the concentration of oxygen in the reaction vessel is kept at 7 vol % or lower. When additional styrene monomers are added during the polymerization, they are added and adsorbed to styrene resin particles in the course of polymerization while the concentration of oxygen is kept low. By this method, the particles whose internal portion has a low molecular weight and surface portion has a high molecular weight are obtained. A foamed article produced from the particles has high strength and a good appearance.Type: ApplicationFiled: May 7, 2003Publication date: November 13, 2003Inventors: Makoto Kunimi, Tetsuya Katou, Makoto Saitou, Hiroshi Nakaguki, Toshio Akima
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Patent number: 5072027Abstract: In a process for producing a methacrylic acid ester by subjecting methyl methacrylate and an alcohol to a transesterification reaction in the presence of a catalyst and a polymerization inhibitor, the filtration time of catalyst and the like can be shortened by making a total water content in the catalyst, alcohol and methyl methacrylate 1000 ppm or less, or the generation of large bubbles during the reaction can be prevented by adding the starting alcohol to the reaction system at the alcohol conversion of 40% or more, or high catalytic activity is obtained even if a secondary or tertiary alcohol is used as a starting material by using as a catalyst that obtained by drying lithium hydroxide monohydrate with heating, these effects being also obtained by combining individual conditions.Type: GrantFiled: October 4, 1989Date of Patent: December 10, 1991Assignee: Hitachi Chemical Company, Ltd.Inventors: Akihiro Kobayashi, Toshio Akima, Takayuki Saito, Toshiyuki Fujita
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Patent number: 4916255Abstract: Methacrylate esters of alcohols having an ether linkage and/or an alicyclic ring can be obtained with no trouble of coloration or polymer formation during the production and for the product. An alcohol having an ether linkage and/or an alicyclic ring is treated with an alkaline substance, and the treated alcohol is caused to react with methyl methacrylate for a transesterification reaction in the presence of an alkaline substance.Type: GrantFiled: May 16, 1988Date of Patent: April 10, 1990Assignee: Hitachi, Ltd.Inventors: Akihiro Kobayashi, Toshiyuki Fujita, Takayuki Saito, Toshio Akima
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Patent number: 4591626Abstract: A polymer obtained by polymerizing tricyclo[5.2.1.0.sup.2,6 ]deca-8-yl acrylate or methacrylate in an amount of 100-5% by weight with one or more copolymerizable unsaturated monomers in an amount of 0 to 95% by weight is excellent in transparency, moisture resistance, and heat resistance and is suitable as a material for optical elements.Type: GrantFiled: October 23, 1984Date of Patent: May 27, 1986Assignee: Hitachi Chemical Company, Ltd.Inventors: Hiromasa Kawai, Takashi Morinaga, Hiromu Miyajima, Toshio Akima, Mitsuharu Kato, Yutaka Hosoi
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Patent number: RE34061Abstract: A polymer obtained by polymerizing tricyclo[5.2.1.0.sup.2,6 ]deca-8-yl acrylate or methacrylate in an amount of 100-5% by weight with one or more copolymerizable unsaturated monomers in an amount of 0 to 95% by weight is excellent in transparency, moisture resistance, and heat resistance and is suitable as a material for optical elements.Type: GrantFiled: May 27, 1988Date of Patent: September 8, 1992Assignee: Hitachi Chemical Co., Ltd.Inventors: Hiromasa Kawai, Takashi Morinaga, Hiromu Miyajima, Toshio Akima, Mitsuharu Kato, Yutaka Hosoi