Patents Assigned to Kureha Kagaku Kogyo Kabushiki Kaisha
  • Method for the production of .alpha.-tetralone
    Patent number: 4283352
    Abstract: In a method for the production of .alpha.-tetralone wherein tetralin is oxidized in the absence of a catalyst at a temperature of from 50.degree. to 100.degree. C. to an extent that the conversion of tetralin into tetralin hydroperoxide is 25 to 35 percent by weight, thereby producing a solution of tetralin hydroperoxide in tetralin, and wherein an inorganic metal salt is added to said solution to decompose the tetralin hydroperoxide to .alpha.-tetralone, the improvement comprising adding to said solution, as said inorganic metal salt, a mixture of at least one water-soluble inorganic iron salt and at least one water-soluble inorganic copper salt at a temperature of from 0.degree. to 90.degree. C.
    Type: Grant
    Filed: January 3, 1979
    Date of Patent: August 11, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takashi Yamauchi, Hirofumi Nanbu
  • Multilayer insulating material and process for production thereof
    Patent number: 4279952
    Abstract: By bonding a graphite sheet possessing tightness to at least one surface of carbon fiber felt sheet possessing gas permeability by means of a carbonaceous binder, a multilayer thermally insulating material suitable for use in a heating furnace employing a nonoxidizing atmosphere is obtained. This insulating material has mechanical strength which does not decrease with a long period of use and gives rise to little contamination of articles being heated in the furnace.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: July 21, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Fumio Kodama, Noboru Ohyama
  • Organic friction material
    Patent number: 4278584
    Abstract: An organic friction material having favorable mechanical, thermal and frictional properties and comprising phenolic resin, carbon fibers, steel fibers and filler is disclosed, the organic friction material not containing any asbestos.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: July 14, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kazuo Noguchi, Hiroto Fujimaki, Kiyoshi Tagaya, Shigetoshi Ajima, Kazutoshi Takada, Kensuke Okuda
  • Palladium complex, process for the preparation thereof and catalyst for producing 1,3-diene oligomers
    Patent number: 4277633
    Abstract: The palladium complex disclosed herein is bis[tri(ortho-tolyl)phosphine] :palladium which is produced by reacting a palladium salt with tri(ortho-tolyl)phosphine and reducing the resultant bis[tri(ortho-tolyl)phosphine] palladium salt with an alcoholic alkali. This complex is useful as a catalyst for the production of 1,3-diene oligomers.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: July 7, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Satoru Enomoto, Hisayuki Wada, Sadao Nishita, Yutaka Mukaida, Mikiro Yanaka, Hitoshi Takita
  • Vacuum packaging method
    Patent number: 4275544
    Abstract: An improved method of vacuum packaging by using a specific laminated film as a package film, the laminated film being composed of a plastically deformable layer of a synthetic resin having a yield stress more than 50 kg/cm.sup.2 at a temperature of 23.degree. C. and an elongation of less than 30% at elastic limit at a shaping temperature of 50.degree. to 180.degree. C. and an elastic layer of a synthetic resin having an elongation of more than 40% at elastic limit at the shaping temperature.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: June 30, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Nobuyuki Hisazumi, Masataka Yamamoto, Tsutomu Uehara
  • Powdery graft-copolymer composition
    Patent number: 4275178
    Abstract: Graft-copolymers for improving impact strength comprising a relatively large quantity of an elastomeric trunk polymer, such as acrylonitrile/styrene/butadiene resins and methyl methacrylate/styrene/butadiene resins, have some undesirable powder characteristics, for example, poor fluidity and an easily blocking property.However, by blending a graft-copolymer of this type with a graft-copolymer comprising a relatively small quantity of an elastomeric trunk polymer in slurry form or dry state, it is possible to obtain a graft-copolymer blend with improved powder characteristics without significantly lowering the effect of improving the impact strength of the former graft-copolymer.The graft-copolymer blend thus obtained, when blended with a hard resin such as polyvinyl chloride, provides a resin composition with high impact strength.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: June 23, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Haruhiko Yusa, Masanori Oota, Katsumi Suzuki
  • Radiation resistant oil and method of lubricating for atomic power facilities
    Patent number: 4275253
    Abstract: A radiation resistant working oil for lubricating parts of atomic power facilities which are exposed to radioactive rays consists essentially of alpha-benzyl substituted methylnaphthalene isomers and beta-benzyl substituted methylnaphthalene isomers in the ratio of about 1:0.2-1:1.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: June 23, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masaaki Takahashi, Akira Ito
  • N-Benzoyl-N'-halogenoalkylidenehydrazine derivatives, process for preparing same, and agricultural and horticultural fungicide comprising such derivatives
    Patent number: 4275078
    Abstract: Novel N-benzoly-N'-halogenoloweralkylidenehydrazine derivatives of the general formula ##STR1## (in which X represents Cl or Br, and Y represents H, F, Cl, Br, CH.sub.3 or CHCl--CH.sub.3, provided that when X is Cl, Y is the above-defined member other than Cl).
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: June 23, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Katsumichi Aoki, Takafumi Shida, Satoru Kumazawa, Masashi Ohtsuru, Shiro Yamazaki
  • Process for the preparation of spherical carbon particles and spherical activated carbon particles
    Patent number: 4273675
    Abstract: Disclosed herein is a process for producing spherical carbon particles in which a pitch or a heavy oil of a low softening point is mixed with an organic solvent to reduce the viscosity thereof and is fused and shaped into spherical particles. Added to the pitch or heavy oil is a material capable of elevating the softening point thereof which is selected from the group consisting of mononitro aromatic compounds, polynitro aromatic compounds, quinones and polycarboxylic acid anhydrides. Also mixed with the pitch is a material capable of preventing the formation of voids in the material, which may be fluid or solid paraffin, polyethylene, alicyclic hydrocarbons, alkylcyclohexanes, fatty alcohols and silicone oil.
    Type: Grant
    Filed: July 31, 1979
    Date of Patent: June 16, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Zenya Shiiki, Kazuhiro Watanabe
  • Method for preparing collagen filaments for use in medical treatments
    Patent number: 4273705
    Abstract: A method for preparation of collagen filaments for use in medical treatments comprising the steps of dispersing a finely shredded insoluble collagen material from which impurities have already been removed in an aqueous acidic solution and of subjecting the thus dispersed collagen material to irradiation of ultrasonic waves.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: June 16, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventor: Tadaaki Kato
  • Protein-bound polysaccharides
    Patent number: 4271151
    Abstract: Disclosed in this invention are protein-bound polysaccharides having antitumor activities. The polysaccharides have molecular weight within a specified range and present a pattern of color reaction peculiar to the saccharides as well as a pattern of color reaction characteristic of amino acids and peptide bonds. The proton nuclear magnetic resonance spectra of the polysaccharides show peculiar absorption bands. The ratio of the polysaccharide portion to protein portion in the polysaccharides is within a specified range. The protein-bound polysaccharides can be obtained by extraction of the mycelia and/or fruit bodies of fungi belonging to Coriolus of Polyporaceae of Basidiomycetes.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: June 2, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tetsuya Hotta, Satoru Enomoto, Chikao Yoshikumi, Minoru Ohara, Saburo Ueno
  • Process for producing a shoe
    Patent number: 4270966
    Abstract: A shoe insole comprising (A) a coarse mesh-like woven cloth backing made of monofilaments of a vinylidene chloride-type polymer, (B) a honeycomb-woven cloth intermediate layer made of monofilaments of the vinylidene chloride-type polymer, (S) a sheet prepared by coating a latex containing activated carbon powder, copper powder and magnetic powder on a non-woven cloth made of staple fibers of the vinylidene chloride-type polymer and/or a vinyl chloride-type polymer and heat-treating the coated cloth, and (D) a fine-woven cloth surface layer made of monofilaments of the vinylidene chloride-type polymer, the cloths (A), (B), (S) and (D) being laminated in order and the peripheral edge of the laminate being welded, and a process for producing the same.
    Type: Grant
    Filed: August 8, 1979
    Date of Patent: June 2, 1981
    Assignees: Kihara Sangyo Kabushiki Kaisha, Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventor: Sueo Kihara
  • Scrubber for removal of sulfur dioxide from exhaust gas
    Patent number: 4269806
    Abstract: A method and apparatus for removing sulfur dioxide from an exhaust gas with use of an absorbent containing a salt of an organic acid within a scrubber provided with perforated plates, characterized in that the vapor of organic acid discharged from the top of the perforated plates is absorbed into the absorbent with a pH value of 6 to 8 within wetted walls provided on the upper side of the perforated plates.
    Type: Grant
    Filed: August 7, 1979
    Date of Patent: May 26, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kunihide Yaguchi, Masakazu Takaiwa, Minoru Aoki
  • Method of preparing para-chlorotoluene
    Patent number: 4269674
    Abstract: A method of preparing para-chlorotoluene by the electrolytic chlorination of toluene in an aqueous solution of hydrogen chloride or a metal halide as an electrolyte by passing an electric current from a cathode to an anode, both of which are immersed in the electrolyte, in order to form an active chlorine species which then reacts with toluene to produce the desired para-toluene. The anode is made of a carbonaceous material having cyclodextrin or a derivative thereof bonded onto its surface. The toluene that is introduced into the aqueous solution of electrolyte is included as a clathrate compound within the cyclodextrin.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: May 26, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tetsuo Osa, Masamichi Fujihira, Tomokazu Matsue, Takashi Yamauchi
  • Control of plant-virus diseases
    Patent number: 4269857
    Abstract: Disclosed herein control of plant-virus diseases by applying a compound obtained by reducing the reaction product of an n-alkylamine with a sugar or a salt thereof on the plant to be protected from the plant-virus as an active ingredient.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: May 26, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takuro Tokuda, Susumu Ikeda, Yoshikazu Kubota, Tutomu Takagi, Yuuichi Kokagi
  • Vinyl chloride resin composition with processing aid
    Patent number: 4268636
    Abstract: A composition comprising polyvinyl chloride and a novel polymer processing aid is provided. The polymer processing aid can be obtained either by blending in latex form an alkyl methacrylate copolymer (A) and a copolymer (B) comprising as its essential constituents an alkyl methacrylate, a dialkyl itaconate or an alkyl acrylate, and a diolefin, or by copolymerizing one of the copolymers in the presence of the other copolymer.The polymer processing aid thus obtained improves the processability of the vinyl chloride resin composition with less reduction in impact strength.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: May 19, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yo Iizuka, Haruhiko Yusa, Susumu Midorikawa, deceased, by Taeko Midorikawa, heir
  • Pharmaceutical composition comprising a nitrogen-containing polysaccharide and an antibiotic agent, and a method of treating an infectious disease therewith
    Patent number: 4268505
    Abstract: A nitrogen-containing polysaccharide, which is obtainable by extracting mycelia of a fungus belonging to the genus Coriolus of Polyporaceae of Basidiomycetes with an aqueous solvent, is effectively used in treating a bacterial infectious disease due to the strain of the pathogenic bacterial species, which has come to be resistant to the treatment with conventional antibiotics.
    Type: Grant
    Filed: August 31, 1979
    Date of Patent: May 19, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chikao Yoshikumi, Yoshio Omura, Tetsuya Hotta
  • Method of and apparatus for making pitch fiber infusible
    Patent number: 4265869
    Abstract: A method of producing carbon fiber by making infusible and carbonizing pitch fiber which is obtained by melt-spinning petroleum-tar pitch or coal-tar pitch, and a method of making pitch fiber infusible in an air atmosphere containing NO.sub.2, at an elevated temperature by introducing a cross-sectionally U-shaped tray with pitch fiber suspended from bars placed across an upper portion thereof into an infusible material producing furnace having gas exchanging chambers in the inlet portion and outlet portion thereof as well as at least two gas circulating means each of which comprises a combination of a blower or a fan and a heat exchanger, and retaining said tray in said furnace.
    Type: Grant
    Filed: June 22, 1979
    Date of Patent: May 5, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hisatsugu Kaji, Iwawo Kameyama, Takashi Hamaguti, Tamotsu Miyamori
  • Method of molding tubular laminate
    Patent number: 4265693
    Abstract: A method of molding a tubular laminate comprising joining flows of a plurality of thermoplasticized resins together to prepare a laminated composite flow having two side edges, and then passing the composite flow having two side edges through an annular extrusion die to abut both side edges of the respective layers to each other in the die, thereby forming an integrated tubular flow.
    Type: Grant
    Filed: September 18, 1979
    Date of Patent: May 5, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshiharu Nishimoto, Kengo Yamazaki
  • Oil sand treating system
    Patent number: 4264431
    Abstract: Residue of distillation, preferably under reduced pressure of oil sand bitumen is thermally treated in a liquid state at a temperature of 350.degree.-450.degree. C. by blowing thereinto an inert heating medium, preferably a superheated steam at a temperature of not lower than the temperature of the residue in a reaction step for 20 to 90 min to crack the residue for converting the residue to a crude synthetic oil, a combustible pitch and a gas, the resultant pitch being utilized to the steps of recovery of oil sand bitumen from oil sand and of distillation as fuel.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: April 28, 1981
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chiwane Ishikawa, Shuichi Sugawara