Patents Assigned to Toyo Soda Manufacturing Co., Ltd.
  • Method of manufacturing high-purity silicon nitride powder
    Patent number: 4387079
    Abstract: A method of manufacturing highly purified silicon nitride including the steps of preparing a nitrogen-containing silane selected from the group consisting of tetra-amide-monosilane and silicon imide, and heat-treating the prepared nitrogen-containing silane in the presence of ammonia in an inner atmosphere at a temperature above 400.degree. C. for a period of at least two hours to obtain silicon nitride, and cooling and collecting the silicon nitride thus formed. The step of preparing the nitrogen-containing silane comprises continuously reacting gaseous silicon tetra-chloride with gaseous ammonia in an inner atmosphere at a temperature of from -30.degree. to 70.degree. C. to produce the nitrogen-containing silane as a product and collecting the product. The resultant silicon nitride so produced has a chlorine content of less than 0.05 weight percent and a nitrogen content of over 38 weight percent.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: June 7, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kiyoshi Kasai, Kohji Tsukuma, Takaaki Tsukidate
  • Solvent extraction method of phosphoric acid
    Patent number: 4377562
    Abstract: A method for solvent extraction of phosphoric acid comprises counter-currently contacting an impure phosphoric acid solution containing at least 45 wt. % of P.sub.2 O.sub.5 with a partially water-miscible solvent in the presence of sulfuric acid, and which is characterized in that(a) as said solvent, a solvent in which from 3 to 10 wt. % of water is soluble, is used, and(b) sulfuric acid is added to a place where the H.sub.3 PO.sub.4 concentration in the aqueous phase is at most 3 mol./l so as to bring the relation between the free sulfuric acid concentration (Y (mol/l)) and the H.sub.3 PO.sub.4 concentration (X (mol/l)) in the aqueous phase of the same place to satisfy the formula5.0-0.83X.gtoreq.Y.gtoreq.2.5-0.83Xwithin the range of the H.sub.3 PO.sub.4 concentration in the aqueous phase being from 0.5 to 3 mol/l.
    Type: Grant
    Filed: October 8, 1981
    Date of Patent: March 22, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Yoichi Hiraga, Osamu Watanabe
  • Process for producing Y-type zeolite
    Patent number: 4376106
    Abstract: A Y-type zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of at least about 4 is produced by the following process. In the first step of the process, an aqueous alkali silicate solution and an aqueous alkali aluminate solution are mixed together in the presence of an alkali in an amount such that the ratio of M.sub.2 O(M: an alkali metal)/Al.sub.2 O.sub.3, present in the mixed solution, is at least about 5 by mole, followed by forming a gel in the mixed solution and, then, separating the gel therefrom. In the second step, the separated gel is incorporated in an aqueous alkali silicate solution or an aqueous alkali silicate-alkali mixed solution to obtain a slurry and, then, a Y-type zeolite crystal is formed in the slurry.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: March 8, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Isao Miyanohara, Shinichi Hashimoto, Hiroshi Miyazaki
  • Method for manufacturing granular organic rubber chemical composition
    Patent number: 4367097
    Abstract: This invention relates to a method for manufacturing a granular organic rubber composition which is useful for a vulcanizing agent, a vulcanization accelerator and antioxidant etc. by contacting an organic rubber chemical mixture comprising a rubber chemical, a liquid polybutene, a nonionic or anionic surface active agent and a water-soluble anionic macromolecule with an aqueous solution containing an alkaline earth metal salt and/or a zinc salt.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: January 4, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Yasuhiro Sakanaka, Takao Hayashi, Tatsuya Koizumi, Sumio Akashi
  • Method of recovering characteristics of deteriorated cation exchange membrane
    Patent number: 4367147
    Abstract: Characteristics of a cation exchange membrane used for an electrolysis of an alkali metal chloride are recovered by immersing the perfluorocarbon type cation exchange membrane in an organic solvent having a water miscibility and a boiling point of higher than 120.degree. C. in 760 mmHg; holding the immersed membrane between a pair of smooth plates and heating at 40.degree. C. to 180.degree. C.; treating the heat-treated membrane in hydrochloric acid and then, immersing it in an aqueous solution of sodium hydroxide and the organic solvent is preferably ethyleneglycol, propyleneglycol, isopropyleneglycol butanediol, pentanediol, hexanediol, glycerin or polyethyleneglycol.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: January 4, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Shunichi Asami, Toru Seita, Akihiko Shimizu
  • Fine fabrication process using radiation sensitive resist
    Patent number: 4367281
    Abstract: A fine work process comprises forming a thin film made of a radiation sensitive polymer on a board; irradiating radiation; developing and etching the product. The radiation sensitive polymer comprises at least 10 wt. % of a polymer having repeat units: ##STR1## wherein R and R' respectively represent hydrogen atom or an alkyl group and n is an integer of number of substituent groups.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: January 4, 1983
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kimio Shibayama, Kingo Itaya, Teruo Fujimoto
  • Method for manufacturing block copolymer
    Patent number: 4365023
    Abstract: A ternary block copolymer and a method for manufacturing it. The copolymer has a molecular structure consisting of a macro-molecule having a cation exchange group, a macro-molecule having an anion exchange group and another macro-molecule which does not have any ion exchange group. These macro-molecules are linked together into a straight chain.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: December 21, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Teruo Fujimoto, Mitsuru Nagasawa, Syotaro Ohno
  • Stable calcium hypochlorite composition and method for manufacture thereof
    Patent number: 4355014
    Abstract: A stable calcium hypochlorite composition and a method for the preparation thereof. The composition has a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate used as main constituent and comprises at least 60 wt % of calcium hypochlorite; at least 5 wt % of calcium hydroxide; at least 4 wt % of water content; and 5 wt % or less of than that calcium chloride. The composition is stable and decomposes only in a less degree at a high temperature and during storage over a long period.
    Type: Grant
    Filed: May 23, 1980
    Date of Patent: October 19, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Tsugio Murakami, Kazushige Igawa, Yoichi Hiraga
  • Method of separating serum albumin and gamma-globulin from each other
    Patent number: 4347138
    Abstract: Serum albumin and a serum .gamma.-globulin are separated by filtration from each other in a solution of a mixture thereof by using an ultrafiltration membrane. The ultrafiltration membrane has a fractionation molecular weight of about 100,000. The total protein concentration and salt concentration in the mixture solution to be forced through the membrane are adjusted to not more than 4 g/dl and not more than 0.6 mole/l, respectively. Also, the pH of the solution is adjusted to a value of from about 3.8 to about 4.7.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: August 31, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Shotaro Ohno, Kenji Koyama, Mitsutoshi Fukuda
  • Process for producing magnesium alloys
    Patent number: 4347077
    Abstract: Process for producing a magnesium alloy which comprises:reducing magnesium oxide with a carbonaceous substance at high temperatures;rapidly cooling the resultant reaction product in an inert atmosphere to obtain powder magnesium;mixing the reaction product with a powder metal to be alloyed therewith during or after the rapid cooling; andsubjecting the mixture to heat treatment.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: August 31, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Takeshi Goto, Noboru Kawakami, Itsuo Hirano, Yoichi Itakura, Yuji Kawahara
  • Process for preparing high-purity .alpha.-type silicon nitride
    Patent number: 4346068
    Abstract: High-purity .alpha.-type silicon nitride comprised of a granular crystal having an .alpha.-phase content of at least 95%, a nitrogen content of at least 38% by weight and an average particle size of not larger than 3 .mu.m is provided. This high-purity .alpha.-type silicon nitride is prepared by heating a nitrogen-containing silane compound at a temperature of at least about 1,300.degree. C. in a heating furnace comprised of a material containing a metal having a melting point exceeding 1,600.degree. C. and capable of being bonded with oxygen at the heating temperature.
    Type: Grant
    Filed: January 5, 1981
    Date of Patent: August 24, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kiyoshi Kasai, Yoshitaka Kubota, Takaaki Tsukidate
  • Analytical method of hydrocarbon compounds
    Patent number: 4341634
    Abstract: A high speed liquid chromatography to separate hydrocarbon compounds contained in a solution into three components, namely, saturates, unsaturates and aromatics, an analytical method of hydrocarbons which comprises(a) using an organic chlorine-containing type solvent or a mixed solvent of an organic chlorine-containing type solvent and a hydrocarbon type solvent as an eluent;(b) connecting the first column into which a silica type packing material is packed and the second column into which a silver-containing silica type packing material is packed in series; and(c) introducing the eluate from the second column to a detector to detect it quantitatively.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: July 27, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Susumu Matsushita, Yoshimitsu Tada, Tetsuo Ikushige
  • Corrosion resistant amorphous noble metal-base alloys
    Patent number: 4339270
    Abstract: An amorphous alloy is prepared by rapid quenching from the liquid state and consists of(1) 10 to 40 atomic percent of P and/or Si(2) 90 to 60 atomic percent of two or more of Pd, Rh and Pt.The amorphous alloy is used for an electrode for an electrolysis.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: July 13, 1982
    Assignees: Toyo Soda Manufacturing Co. Ltd., Koji Hashimoto
    Inventors: Koji Hashimoto, Tsuyoshi Masumoto, Motoi Hara, Katsuhiko Asami, Kazutaka Sakiyama
  • Process for separating .gamma.-globulin aggregate by polysulfone membrane
    Patent number: 4333870
    Abstract: .gamma.-Globulin aggregate is separated by a membrane from an aqueous solution of .gamma.-globulin through an ultrafiltration membrane.
    Type: Grant
    Filed: September 17, 1980
    Date of Patent: June 8, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kenji Koyama, Syotaro Ohno, Mitsutoshi Fukuda
  • Method for electrolyzing alkali metal halide
    Patent number: 4316781
    Abstract: An improved method for electrolyzing alkali metal halide. Electrolysis is carried out by supplying an aqueous solution of a halide of alkali metal into an anode chamber partitioned by a cation-exchange membrane and water into a cathode chamber to obtain halogen from the anode chamber and hydrogen and alkali hydroxide from the cathode chamber. The cation-exchange membrane is a fluorocarbon polymer membrane which is prepared by arranging one side thereof to have a cation exchange group concentration lower by 10 to 30% within a depth range of 1 to 100.mu. than that of the other side. The anode chamber is prepared with this side of the membrane which has the lower cation exchange group concentration arranged to face the anode chamber. By this arrangement, a high purity alkali hydroxide can be manufactured at a high rate of decomposition of halide of alkali metal and at a high current efficiency.
    Type: Grant
    Filed: September 30, 1980
    Date of Patent: February 23, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Toru Seita, Takao Satoh, Mitsuo Kikuchi
  • Polysaccharides containing allose
    Patent number: 4312979
    Abstract: A new polysaccharide including allose as a constituent sugar and further characterized by galactose as a major constituent sugar is described. The polysaccharide is produced extracellularly by cultivation of Pseudomonas viscogena strains in nutrient medium.
    Type: Grant
    Filed: April 16, 1979
    Date of Patent: January 26, 1982
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Hisao Takemoto, Tatsuo Igarashi
  • Bromination of side chain of m-phenoxytoluene
    Patent number: 4302306
    Abstract: A process for brominating m-phenoxytoluene with a polyhaloethane having the formula ##STR1## wherein W and Z respectively represent Cl or Br and X and Y respectively represent Cl, Br or H in a liquid phase.
    Type: Grant
    Filed: April 18, 1980
    Date of Patent: November 24, 1981
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kanzi Katsuragawa, Hideo Sakka, Keiichi Kihara
  • Electrolysis of aqueous solution of alkali metal chloride
    Patent number: 4295944
    Abstract: An alkali metal hydroxide and hydrogen in a cathode compartment and chlorine in an anode compartment by feeding an aqueous solution of an alkali metal chloride in said anode compartment which is partitioned from said cathode compartment with a cation exchange membrane made of a fluorinated polymer is produced under a condition that a temperature of said anode compartment is kept at lower than a temperature of said cathode compartment in said electrolysis.
    Type: Grant
    Filed: July 8, 1980
    Date of Patent: October 20, 1981
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Takao Satoh, Toru Seita
  • Water dropping type irrigation pipe
    Patent number: 4285472
    Abstract: A water dropping type irrigation pipe includes a conduit formed by peeling laminated films in a longitudinal direction; laminated side parts projected to both sides of the conduit in a form of fins and a water distribution passage formed by peeling at least one of the laminated side parts in a distribution passage pattern having a throat part which is branched from the conduit.
    Type: Grant
    Filed: April 10, 1979
    Date of Patent: August 25, 1981
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Hiroaki Okada, Takefumi Sonoda, Osamu Shoji
  • Process for manufacturing a petroleum resin
    Patent number: 4283518
    Abstract: The present invention relates to a process for manufacturing a petroleum resin wherein a fraction (component A) containing an aromatic hydrocarbon obtained by cracking of petroleum and a thermally polymerized oil (component B) obtained by previously thermal-polymerizing the component A are mixed and then the mixture of the components A and B is subjected to polymerization by employing a Friedel-Crafts catalyst. It is also directed to propose a petroleum resin of a superior quality having a softening point optionally in a range of 30.degree.-120.degree. C. and various bromine value in such a manner that a mixing ratio of the components A and B is properly adjusted.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: August 11, 1981
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Toru Iwashita, Mineo Nagano, Koji Tanaka