Patents by Inventor Ritsuo Kitada
Ritsuo Kitada 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: 7354984Abstract: To efficiently dry it, a nonionic alkylene oxide-type water-soluble resin is put into a container, then the container is degassed to a prescribed vacuum degree which is maintained while a dry gas having a dew point not higher than prescribed is introduced into the container at a rate not lower than prescribed. Minor volatiles are efficiently removed from the resin in an evaporation tank having a stirring blade. For protecting the dried resin from water, a dry gas is introduced into and air is purged from an empty packaging container whereafter the resin is charged into the container is sealed. By controlling solvent content and visocity of the resin and loading it into a temperature-controlled transportation container and/or unloading it out of the transportation container by the use of a pump, good subsquent processability of the resin and prevention of deterioration thereof are ensured.Type: GrantFiled: February 18, 2005Date of Patent: April 8, 2008Assignees: Dai-ichi Kogyo Seiyaku Co., Ltd., Nippon Shokubai Co., Ltd.Inventors: Michiyuki Kono, Manabu Kikuta, Masaki Tezuka, Hiroshi Tanaka, Takao Yokohashi, Takao Nishihata, Kazuhiko Murata, Taketo Toba, Fumihide Tamura, Ritsuo Kitada
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Patent number: 7122698Abstract: The present invention provides a process for more efficiently producing an ?-hydroxycarboxylic acid ester wherein side reactions due to the ?-hydroxycarboxylic acid ester are inhibited or prevented in comparison with prior art production processes. The invention provides a process for producing an ?-hydroxycarboxylic acid ester comprising Steps 1 to 3: Step 1. reacting, in the presence of oxygen, (i) a 1,2-diol with a 1,2-diol or (ii) a 1,2-diol with an alcohol to obtain a reaction product containing an ?-hydroxycarboxylic acid ester; Step 2. separating the ?-hydroxycarboxylic acid ester from the reaction product obtained in Step 1 by distillation under reduced pressure; and Step 3. feeding Step 1 with a mixture obtained by partially or entirely removing water from the reaction product, wherein the mixture contains an unreacted 1,2-diol and/or alcohol.Type: GrantFiled: October 8, 2003Date of Patent: October 17, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Hiroshi Yoshida, Hideaki Tsuneki, Toshio Hayashi, Hideyuki Baba, Takahiro Inagaki, Satoshi Nakagawa, Yukihiko Kakimoto, Ritsuo Kitada, Kohei Umehara
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Publication number: 20050245410Abstract: The residual amount of a solvent in a water soluble nonionic alkylene oxide resin is decreased in an apparatus including an evaporation vessel and a stirring blade which scrapes-up and coats resin solution onto the inner wall surface of the evaporation vessel. A water soluble nonionic alkylene oxide resin having a crystallization temperature of 10 to 60° C. is extruded to a predetermined thickness in a molten state, the extruded molten resin is brought into contact with a metal surface which is at the crystallization temperature (Tc) or lower, and the thereby solidified resin may be cut into pellets. The resin pellets preferably are of rectangular shape and prescribed dimensions. The resin may be pulverized in a pulverizer by shearing force between a rotary blade and a fixed blade. In the pulverizer, grains smaller than a predetermined size pass through the screen, while larger grains are again pulverized.Type: ApplicationFiled: February 18, 2005Publication date: November 3, 2005Inventors: Masaki Tezuka, Hiroshi Tanaka, Takao Yokohashi, Takao Nishihata, Manabu Kikuta, Michiyuki Kono, Tetsuya Higashizaki, Kazuo Takei, Taketo Toba, Toshiaki Kuriyama, Izuho Okada, Fumihide Tamura, Ritsuo Kitada, Shigetaka Takamiya, Jun Iwamura, Takanori Murakami, Hiromoto Katsuyama, Teruki Matsushita
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Publication number: 20050211956Abstract: To efficiently dry it, a nonionic alkylene oxide-type water-soluble resin is put into a container, then the container is degassed to a prescribed vacuum degree which is maintained while a dry gas having a dew point not higher than prescribed is introduced into the container at a rate not lower than prescribed. Minor volatiles are efficiently removed from the resin in an evaporation tank having a stirring blade. For protecting the dried resin from water, a dry gas is introduced into and air is purged from an empty packaging container whereafter the resin is charged into the container is sealed. By controlling solvent content and visocity of the resin and loading it into a temperature-controlled transportation container and/or unloading it out of the transportation container by the use of a pump, good subsquent processability of the resin and prevention of deterioration thereof are ensured.Type: ApplicationFiled: February 18, 2005Publication date: September 29, 2005Inventors: Michiyuki Kono, Manabu Kikuta, Masaki Tezuka, Hiroshi Tanaka, Takao Yokohashi, Takao Nishihata, Kazuhiko Murata, Taketo Toba, Fumihide Tamura, Ritsuo Kitada
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Publication number: 20050090686Abstract: The present invention provides a process for more efficiently producing an ?-hydroxycarboxylic acid ester wherein side reactions due to the ?-hydroxycarboxylic acid ester are inhibited or prevented in comparison with prior art production processes. The invention provides a process for producing an ?-hydroxycarboxylic acid ester comprising Steps 1 to 3: Step 1. reacting, in the presence of oxygen, (i) a 1,2-diol with a 1,2-diol or (ii) a 1,2-diol with an alcohol to obtain a reaction product containing an ?-hydroxycarboxylic acid ester; Step 2. separating the ?-hydroxycarboxylic acid ester from the reaction product obtained in Step 1 by distillation under reduced pressure; and Step 3. feeding Step 1 with a mixture obtained by partially or entirely removing water from the reaction product, wherein the mixture contains an unreacted 1,2-diol and/or alcohol.Type: ApplicationFiled: October 8, 2003Publication date: April 28, 2005Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Hiroshi Yoshida, Hideaki Tsuneki, Toshio Hayashi, Hideyuki Baba, Takahiro Inagaki, Satoshi Nakagawa, Yukihiko Kakimoto, Ritsuo Kitada, Kohei Umehara
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Patent number: 5965676Abstract: The present invention provides a polymerizable monomer composition particle and a resin particle, both of which display a narrow particle diameter distribution. A process for producing a resin particle comprises the steps of: passing two liquids through a static type in-line mixer having a liquid-dividing mechanism standing in a static state, wherein the two liquids are formable into two phases including one of the two liquids as a dispersing phase component and the other as a continuous phase component; then passing the two liquids through a high speed shearing type dispersing machine having a liquid-shearing mechanism which revolves at a high speed, thus dispersing a fine liquid drop of the dispersing phase component into the continuous phase component; and forming a resin particle from the resultant liquid drop.Type: GrantFiled: November 3, 1997Date of Patent: October 12, 1999Assignee: Nippon Shokubai Co., Ltd.Inventors: Kazuhiro Anan, Ritsuo Kitada, Mitsuo Kushino
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Patent number: 4621155Abstract: A catalyst for the vapor-phase oxidation of an unsaturated hydrocarbon, alcohol, saturated aliphatic aldehyde or unsaturated aliphatic aldehyde having 4 carbon atoms, said catalyst comprising a molybdovanadophosphoric acid having X-ray diffraction lines (Cu-K.sub..alpha. radiation) at 2.theta.=about 26.2.degree., about 10.5.degree., about 21.3.degree. and about 30.3.degree. and a crystal structure approximating that of its salt, and said catalyst having the composition represented by the general formulaP.sub.a Mo.sub.b V.sub.c X.sub.d Y.sub.e O.sub.Type: GrantFiled: December 14, 1984Date of Patent: November 4, 1986Assignee: Nippon Shokubai Kagaku Kogyo Co. Ltd.Inventors: Michio Ueshima, Yoshiyuki Takahashi, Ritsuo Kitada, Isao Nagai
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Patent number: 4419270Abstract: A catalyst for the vapor-phase oxidation of an unsaturated hydrocarbon, alcohol, saturated aliphatic aldehyde or unsaturated aliphatic aldehyde having 4 carbon atoms, said catalyst comprising a molybdovanadophosphoric acid having X-ray diffraction lines (Cu-K.sub..alpha. radiation) at 2.theta.=about 26.2.degree., about 10.5.degree., about 21.3.degree. and about 30.3.degree. and a crystal structure approximating that of its salt, and said catalyst having the composition represented by the general formulaP.sub.a Mo.sub.b V.sub.c X.sub.d Y.sub.e O.sub.Type: GrantFiled: June 19, 1981Date of Patent: December 6, 1983Assignee: Nippon Shokubai Kagaku Kogyo Co. Ltd.Inventors: Michio Ueshima, Yoshiyuki Takahashi, Ritsuo Kitada, Isao Nagai