Patents Assigned to Mitsui Toatsu Chemicals
  • Luminescence element
    Patent number: 5200668
    Abstract: This invention relates to an injection type thin film luminescence element having a high luminance and a high stability characterized in having two electrode layers at least one of which is transparent or translucent and having between these two electrode layers a luminescence function-manifesting layer comprising a laminated layer of a p-type or n-type inorganic semiconductor thin film layer and an organic compound thin film layer.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: April 6, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yutaka Ohashi, Atsuhiko Nitta, Nobuhiro Fukuda, Hiroshi Waki
  • Method for increasing intrinsic viscosity of syndiotactic polypropylene
    Patent number: 5200439
    Abstract: A method for increasing the intrinsic viscosity of polypropylene having a substantially syndiotactic structure is disclosed which comprises the step of irradiating the syndiotactic polypropylene with radiation in the absence of oxygen. After the irradiation, the polypropylene is preferably heated. Furthermore, the polypropylene having the substantially syndiotactic structure which remains in a melting state can be irradiated with radiation. The polypropylene having the substantially syndiotactic structure is preferably polypropylene in which any diffraction line is not substantially observed in a spacing of about 7.1 .ANG. by X-ray diffraction.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: April 6, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventor: Tadashi Asanuma
  • Catalyst for oxidizing methacrolein and method for preparing methacrylic acid
    Patent number: 5198579
    Abstract: A composite oxide catalyst represented by the general formula: Mo-V-P-X-Y (wherein X represents at least one element selected from the group consisting of Sb, Cu, Co, Bi and As; Y represents at least one element selected from the group consisting of K, Rb, Cs and Tl) and a method for preparing methacrylic acid through gas phase catalytic oxidation of methacrolein with molecular oxygen in the presence of the foregoing catalyst are herein disclosed. The catalyst exhibits excellent catalytic activity, selectivity to methacrylic acid, catalytic stability and lifetime.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: March 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadatoshi Honda, Nobuhiko Horiuchi, Jun Kitagawa, Masami Murakami, Kazunori Kawahara, Hirofumi Io
  • Polyol and utilization thereof
    Patent number: 5198475
    Abstract: A polyurethane resin, rigid polyurethane foam and composite thereof prepared by using a polyol comprising a phenol resin base polyol mixed with an aminophenol base polyol or a polyphenylpolyxylylenepolyamine base polyol or a polymethylenepolyphenylpolyamine base polyol.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: March 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Masayuki Kimura, Satoshi Ozaki, Tsukuru Izukawa, Haruhiko Kawakami, Takayoshi Masuda, Mitsugu Kita
  • Resin compositions and molded articles
    Patent number: 5198508
    Abstract: There is disclosed a resin composition comprising a product produced by the reaction of (a) a prepolymer prepared by reacting a diisocyanate with a hydroxy fatty acid ester or a mixture of a hydroxy fatty acid ester and a polyether polyol, with (b) at least one member selected from the group consisting of aromatic polyamines, polyether polyamines and polyether polyimines or a mixture of such a member as above and a polyether polyol. The resin composition is useful as an internal release agent for resins for reaction injection molding.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: March 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hiroshi Ueda, Yoshio Yoshida, Hiroshi Inoue, Toshikazu Kaneda, Toshiaki Moriya, Tsutomu Kumazawa
  • Optical recording media
    Patent number: 5196231
    Abstract: Disclosed are optical recording media, each of which is composed of a substrate and a recording layer formed on the substrate. The recording layer includes an organic-dye-containing layer and an organopolysiloxane resin layer formed by the condensation of a trifunctional silane represented by R.sup.1 Si(OR.sup.2).sub.3-n (X).sub.n and a tetrafunctional silane represented by Si(OR.sup.3).sub.4-m (X).sub.m, wherein R.sup.1, R.sup.2 and R.sup.3 individually represent an alkyl or aryl group, X a hydroxyl group or a halogen atom, and n and m 0, 1, 2 or 3 and 0, 1, 2, 3 or 4, respectively.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: March 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Sumio Hirose, Shigeru Takahara, Tadashi Koike, Shin Aihara, Keiji Ueno
  • Purification process of methacrylic acid
    Patent number: 5196578
    Abstract: A process is provided for the purification of methacrylic acid. The process can easily remove dibasic acids and aldehydes containing in trace amounts as impurities. According to the process, crude methacrylic acid obtained as an aqueous solution by vapor-phase catalytic oxidation of isobutylene, tertiary butanol, methacrolein or isobutyl aldehyde is treated with at least one compound selected from the group consisting of m-aminophenol, m-phenylenediamine, 2,4-diaminotoluene and 2,4-diamino-diphenylamine, followed by distillation, optionally, in the presence of a p-phenylene diamine.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: March 23, 1993
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Kuraray Co., Ltd.
    Inventors: Morimasa Kuragano, Takeshi Isobe, Nobutaka Ueda, Minoru Koshibe, Yoshihiro Sezaki, Hirozo Segawa, Katsuji Yoguchi, Rensuke Ikarashi
  • Process for producing granules of polycarbonate and composition thereof
    Patent number: 5196507
    Abstract: Polycarbonate granules are produced by adding a solution of polycarbonate in an organic solvent to a suspension composed of water, an anti-solvent for polycarbonate and polycarbonate powder with stirring while evaporating and removing the organic solvent for polycarbonate added to the suspension. The procedure may be effected in the presence of a stabilizing agent for polycarbonate. The resulting polycarbonate granules are easy in handling, and free from fine powder, have high bulk density, large particle size and uniform quality, and can be directly molded.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: March 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshiyuki Totani, Masakatsu Nakatsuka, Akihiro Yamaguchi
  • Polymide
    Patent number: 5196506
    Abstract: A polyimide having a high heat-resistance good processability and recurring structural units of the formula (I): ##STR1## wherein R is a tetravalent radical selected from the group consisting of an aliphatic radical having at least two carbon atoms, alicyclic radical, monocyclic aromatic radical, fused polycyclic aromatic radical and polycyclic aromatic radical bonded through a direct bond or a bridge member.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: March 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shoji Tamai, Masahiro Ohta, Akihiro Yamaguchi
  • Semiconductor film and process for its production
    Patent number: 5194398
    Abstract: A method for forming an amorphous semiconductor film, which comprises (a) a film-forming step of forming a semiconductor film having not more than 20 atomic percent of bound hydrogen to a thickness of 3 to 1000 .ANG., and (b) a modifying step of modifying the formed film, the steps being repeated multiple times.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: March 16, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kenji Miyachi, Nobuhiro Fukuda, Yoshinori Ashida, Masato Koyama
  • Optical urethane resins and plastic lenses comprising the same
    Patent number: 5194559
    Abstract: Optical urethane resins according to the present invention are each obtained by reacting an active hydrogen compound with an isocyanate compound containing as a stabilizer a phenolic compound. Owing to their low yellowness, high light transmittance and optical-strain-free quality, these resins are useful as optical materials for plastic lenses or the like which are required to be colorless, transparent and uniform.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: March 16, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Koju Okazaki, Masahiko Kusumoto, Hiroyuki Yamashita, Teruyuki Nagata
  • Modified polyester composition and preparation process and use thereof
    Patent number: 5194473
    Abstract: In preparing bioabsorbable polyesters containing glycolic acid unit and/or lactic acid unit by the polymerization of glycolide and/or lactide, compositions comprising polyester-silicone copolymers obtained by conducting polymerization in the presence of silicones and the effect of merely mixing the above bioabsorbable polyesters with certain kind of silicones upon the modification, thereby attaining flexibility in particular, of the bioabsorbable polyesters, are disclosed.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: March 16, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hosei Shinoda, Masami Ohtaguro, Shigeru Iimuro
  • Fluoran compound, useful in heat sensitive recording materials
    Patent number: 5194632
    Abstract: Disclosed are a novel fluoran compound represented by the formula (I): ##STR1## and a heat-sensitive recording paper which is obtained by using the fluoran compound as a chromogenic compound and is excellent in preserving stability.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: March 16, 1993
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi
  • Preparation process of aminoketones
    Patent number: 5194606
    Abstract: Novel aminoketones useful as central muscle relaxants and their preparation processes are disclosed. The disclosed processes are novel processes which do not use any heavy metal in view of the facts that their products are will be used as drugs and which require no complex purification step such as liberation of the aminoketones from their hydrochlorides or the like.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: March 16, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Akira Matsubara, Kazuya Sakai, Hideki Tanada, Hironori Komatsu
  • Anti-ganglioside GD.sub.1 A monoclonal antibody MZ, MZ-producing cells and MZ-containing reagent
    Patent number: 5192662
    Abstract: Disclosed is a novel anti-ganglioside GD.sub.1a monoclonal antibody (MZ) which is capable of recognizing ganglioside GD.sub.1a but is practically incapable of recognizing GalCer, LacCer, Gb.sub.3, Gb.sub.4, GA.sub.1, GA.sub.2, GM.sub.2, GM.sub.3, GD.sub.1b, GT.sub.1b, GQ.sub.1b, Fuc-GM.sub.1, nLc.sub.4 and sialosyl nLc.sub.4 ; MZ-producing cells; an MZ-containing reagent; and a method for the detection or quantification of GD.sub.1a using the reagent, e.g., to diagnose cancer, systematic lupus erythematosus and diseases resulting from organic injury of the nervous system.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: March 9, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shizuo Shimada, Daiji Iwata, Wakao Sato
  • Dialkoxymethylimidazolidine derivatives, preparation thereof, insecticides containing same as an effective ingredient and intermediates therefor
    Patent number: 5192778
    Abstract: Novel dialkoxymethylimidazolidine derivatives of the formula (1) ##STR1## are described. Also, a preparation process of the derivatives and insecticidal compositions comprising the same are set forth.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: March 9, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kenji Kodaka, Katsutoshi Kinoshita, Michihiko Nakaya, Koichi Ebihara, Shirou Shiraishi, Eiichi Yamada, Satoshi Numata
  • Transparent heat-resistant styrene-base copolymer
    Patent number: 5191046
    Abstract: A transparent heat-resistant styrene-base copolymer comprising specific amounts of units derived respectively from (a) a styrene-type monomer, (b) a (meth)acrylonitrile monomer and/or (meth)acrylic ester type monomer and (c) a phenylmaleimide monomer, in which the weight ratio (b)/(c) and the ratio of the weight average molecular weight to the number average molecular weight fall within their respective specific ranges and the amount of the phenylmaleimide-type monomer still remaining in the copolymer is below a certain specific concentration.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: March 2, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Mune Iwamoto, Norifumi Ito, Tetsuyuki Matsubara, Toshihiko Ando
  • Block-copolymerized-rubber-modified styrene copolymers
    Patent number: 5191023
    Abstract: The present invention relates to rubber-modified styrene copolymer that exhibits excellent rigidity, impact strength, external appearance and fluidity, while retaining rigidity, impact properties and external appearance, and when prepared by copolymerizing a maleimide monomer, has high heat resistance and therefore is suitable for materials for components of electric equipments, electronic equipments, automobiles and business machines.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: March 2, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Mune Iwamoto, Norifumi Ito, Tetsuyuki Matsubara, Kazuo Sugazaki, Toshihiko Ando
  • Mercapto compound, a high refractive index resin and lens and a process for preparing them
    Patent number: 5191055
    Abstract: The present invention relates to a mercapto compound, a process for preparing the mercapto compound, a process for preparing a polythiourethane base resin containing the mercapto compound, and a process for preparing plastic lenses containing the resin.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: March 2, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai, Toshiyuki Suzuki
  • Ferromagnetic metal particles and preparation process thereof
    Patent number: 5188898
    Abstract: Ferromagnetic metal particles the surface layer of which comprises laminatedly covered films of a ferrite compound having a spinel structure of at least one metal selected from cobalt, zinc, manganese, aluminum, chromium, nickel and copper and iron and a preparation process thereof.The particles can be used as a high density magnetic recording medium.
    Type: Grant
    Filed: April 4, 1991
    Date of Patent: February 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kimiteru Tagawa, Seiichi Takahashi, Noritoshi Utsuno, Hideki Umehara, Fujio Hayashi, Shigeo Kiba, Satoru Suda