Patents Assigned to Mitsui Toatsu Chemicals, Inc.
  • Process for preparing high-purity aniline
    Patent number: 5616806
    Abstract: A process for the continuous preparation of aniline by hydrogenating nitrobenzene with hydrogen is disclosed which comprises the steps of suspending, in an aniline solvent, a catalyst of palladium or palladium-platinum which is deposited on a lipophilic carbon having an oil absorbency of at least 100, and carrying out reaction at a temperature of from 150.degree. to 250.degree. C. substantially in the absence of water while aniline and water formed in said reaction are continuously distilled off as vapor from the reaction product, and the concentration of nitrobenzene in the reaction solution is maintained at 0.01% by weight or less, wherein a zinc compound is added to the reaction system as a promotor and carbon monoxide is added to the hydrogen at a concentration of 1-500 ppm.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: April 1, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Teruyuki Nagata, Katsuji Watanabe, Yoshitsugu Kono, Akihiro Tamaki, Takashi Kobayashi
  • Insecticidal tetrahydrofuran-compound
    Patent number: 5614527
    Abstract: A tetrahydrofuran-compound is disclosed herein which is represented by the formula (1) ##STR1## wherein each of X.sub.1 and X.sub.2 is a hydrogen atom or a methyl group, Y is a hydrogen atom or a carbonyl group substituted by a lower alkyl group (Y') having 1 to 4 carbon atoms, i.e., an acyl group (--COY'), andn is 2 or 3,and an insecticide containing the tetrahydrofuran-compound as an effective component.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: March 25, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Katsutoshi Kinoshita, Takeo Wakita, Kenji Kodaka, Hirozumi Matsuno, Kenichi Satoh, Shirou Shiraishi, Kazutomi Ohnuma, Eiichi Yamada, Naoko Yasui, Nobuyuki Kawahara, Koichi Ebihara, Michihiko Nakaya
  • Polythiol useful for preparing sulfur-containing urethane-based resin and process for producing the same
    Patent number: 5608115
    Abstract: A novel polythiol having four or more functional groups, a process for producing the polythiol comprising reacting thiourea with a specific compound, a sulfur-containing urethane-based resin prepared from the polythiol and a lens made of the resin. The resin has a high refractive index, and low dispersion of refractive index, is lightweight, colorless and transparent, has no optical distortion, and has excellent characteristics in weatherability, dye-affinity, heat resistance, impact resistance and machinability.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: March 4, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Koju Okazaki, Yoshinobu Kanemura, Teruyuki Nagata
  • Disproportionating method of trimethylamine
    Patent number: 5608114
    Abstract: Upon subjecting trimethylamine with ammonia and optionally, a methylamine to a disproportioning reaction to reduce the proportion of the trimethylamine, use of a zeolite as a catalyst, said zeolite being mordenite, clinoptilolite or the like at least 80% of whose ion-exchangeable cations being in the form of hydrogen ions, makes it possible to efficiently conduct the reaction at a low reaction temperatures and also to suppress by-production of impurities such as acetonitrile.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: March 4, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventor: Tadamitsu Kiyoura
  • Process for catalytic hydration of olefins
    Patent number: 5608123
    Abstract: There is provided a process for reacting water and olefin such as ethylene or propylene under mild conditions in the presence of a polyorganosiloxane contaminating sulfonic acid groups to produce alcohol corresponding to the olefin with high yield and selectivity.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: March 4, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kaoru Inoue, Masao Iwasaki, Naohiro Ueda
  • Immunological detection method of pyrethroid compound, haptenic compound, intermediate for the haptenic compound, immunogen and antibody
    Patent number: 5608104
    Abstract: Described is a detection method of a pyrethroid compound which comprises providing a first antibody against the pyrethroid compound, said first antibody having been obtained by immunizing a responder with an immunogen which is a first conjugate between a first carrier and a first haptenic compound represented by the following formula (1) or (2): ##STR1## mixing the first antibody with the sample solution, causing any unreacted portion of the first antibody to be bound on a second conjugate as a coated antigen, said second conjugate being formed of a second carrier and a second haptenic compound and having been coated on a surface of a solid phase carrier, whereby an antigen-antibody conjugate is obtained; andreacting the antigen-antibody conjugate with a second antibody against the first antibody, said second antibody having a labelled enzyme linked therewith.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: March 4, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hideo Ohkawa, Koji Kitajima, Kenji Kodaka, Yasunori Fumoto, Takako Kumeta
  • Plastic lenses having a high-refractive index, process for the preparation thereof and casting polymerization process for preparing sulfur containing urethane resin lens and lens prepared thereby
    Patent number: 5594088
    Abstract: One aspect of the present invention relates to a process for preparing plastic lenses having a high-refractive index comprising forming a mixture containing one or more polyisocyanate compounds; one or more active hydrogen compounds selected from the group consisting of a polyol compound having no sulfur atom, a polyol compound having at least one sulfur atom, and a polythiol compound having at least one sulfur atom in addition to the sulfur atom contained in mercapto group and at least one internal releasing agent and then casting and polymerizing the mixture.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 14, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Teruyuki Nagata, Koju Okazaki, Tohru Miura, Nobuyuki Kajimoto, Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai
  • Process for producing 1,3-dialkyl-2-imidazolidinone
    Patent number: 5594149
    Abstract: A novel bis-urea compound, preparation process of the compound, and preparation process of 1,3-dialkyl-2-imidazolidinone are disclosed and the disclosure provides a novel preparation process of 1,3-dialkyl-2-imidazolidinone and simultaneously enables effective utilization of N,N',N"-trialkyldiethylentriamine which lacks a large amount use and is desired to develop new application.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: January 14, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hiroshi Naruse, Hideki Mizuta, Shinichi Umeda, Teruyuki Nagata
  • Molded articles of syndiotactic polypropylene and method for preparing same
    Patent number: 5591817
    Abstract: A molded article of a syndiotactic polypropylene having excellent transparency in which a melting point attributed to the polypropylene having the syndiotactic structure measured at a heating rate of 10.degree. C./minute by differential scanning thermal analysis is represented by a substantially single peak, the aforesaid molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of the homopolymer or the copolymer and a small amount of a polypropylene having a substantially isotactic structure, followed by quenching, or, after these steps, additionally subjecting the above molded article to a heat treatment at a temperature of less than its melting point. A method for preparing the above molded article is also disclosed here.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: January 7, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tateyo Sasaki, Mitsuru Ito, Tetusnosuke Shiomura
  • Water-resistant surface coating formulations and paper coated therewith
    Patent number: 5587246
    Abstract: The present invention provides a water-resistant surface coating formulation comprising a reaction product obtained by subjecting an acrylamide polymer to a crosslinking reaction with 0.1 to 20 parts by mole, per 100 parts by mole of amido groups in the acrylamide polymer, of a glyoxalmonoureine; a method for improving the water resistance of paper by using the formulation; and coated paper so obtained. As a result of improved water resistance of the coating formulation, this invention makes it possible to conduct coating work stably.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: December 24, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Haruki Tsutsumi, Yoshiaki Ikemoto, Mitsuhiro Maehama, Toshiki Oyanagi, Tsugio Matsubara
  • Process for producing 1,3-dialkyl-2-imidazolidinone
    Patent number: 5583256
    Abstract: A novel bis-urea compound, preparation process of the compound, and preparation process of 1,3-dialkyl-2-imidazolidinone are disclosed and the disclosure provides a novel preparation process of 1,3-dialkyl-2-imidazolidinone and simultaneously enables effective utilization of N,N',N"-trialkyldiethylentriamine which lacks a large amount use and is desired to develop new application.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: December 10, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hiroshi Naruse, Hideki Mizuta, Shinichi Umeda, Teruyuki Nagata
  • Polyimide resin composition
    Patent number: 5580918
    Abstract: A polyimide resin composition comprising 50-95 parts by weight of a polyimide resin represented by the following formula (1): ##STR1## wherein X represents a direct bond, a hydrocarbon group, a carbonyl group, a thio group or so, Y.sub.1 -Y.sub.4 individually represent a hydrogen atom, a lower alkyl group or so and R.sub.1 represents an aliphatic group, an aromatic group or so; and 50-5 parts by weight of a polyetheretherketone, said composition having been subjected to heat treatment at 250.degree.-330.degree. C. and, after the heat-treatment, having crystallization enthalpy of 0-6 cal/g.The heat treatment of the polyimide resin composition can be effected at a low temperature in a short time. The polyimide resin composition has excellent dimensional stability and high-temperature physical properties. Moreover, it has excellent moldability and peeling resistance.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: December 3, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Atsushi Morita, Yoshihisa Gotoh, Toshiaki Takahashi, Kayako Ito, Hiroyasu Oochi, Tomohito Koba, Katunori Simamura, Hiroaki Tomimoto, Nobuhiro Takizawa
  • High-speed polymerizable resin composition and lenses obtained therefrom
    Patent number: 5578658
    Abstract: Described are a high-speed polymerizable resin composition and a lens obtained from it. The composition comprises:a) at least 70 but smaller than 90 parts by weight of a mixture composed of:i) an aromatic polyisocyanate compound represented by the following formula (I): ##STR1## wherein R represents a hydrogen atom or a methyl group, and ii) a polythiol having at least 3 mercapto groups per molecule and a sulfur content of at least 40 wt. %; andb) at least 10 but smaller than 30 parts by weight of a compound which has, in a molecule, at least one functional group selected from a hydroxyl group or a mercapto group and also at least one functional group selected from an acrylic group, methacrylic group or styrylic group, said composition containing isocyanato groups.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: November 26, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Katsuyoshi Sasagawa, Kenichi Fujii, Noboru Kawasaki, Toshiyuki Suzuki
  • Optical recording medium
    Patent number: 5573831
    Abstract: An optical recording medium comprising a transparent substrate; a recording layer on the transparent substrate; a metal reflective layer; and one or more protective layers. These layers are laminated successively on the transparent substrate. The outermost protective layer is formed of an ultraviolet curable resin containing an organic filler and/or an inorganic filler having water absorbency and/or oil absorbency. The protective layer has a printable surface permitting writing characters with writing instruments or ink jet printers.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: November 12, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yuko Suzuki, Shin Aihara, Sumio Hirose
  • Polymeric insulating material and formed article making use of the material
    Patent number: 5573840
    Abstract: The invention provides a polymeric insulating material having a high dielectric breakdown voltage. The material comprises polypropylene which has been obtained in a yield of at least 300,000 g/g-Ti based on titanium in a catalyst upon polymerization, contains ash in an amount not greater than 40 ppm by weight when analyzed by completely burning the polypropylene in air, said ash containing titanium in an amount not greater than 1 ppm by weight based on the weight of the polypropylene, and also contains chlorine in an amount not greater than 2 ppm by weight and boiling n-heptane soluble matter in an amount not smaller than 1 wt. % but not greater than 10 wt. %. To further improve the dielectric breakdown voltage an inorganic oxide or hydroxide free of particles of 10 .mu.m and greater in diameter and having an average particle size not greater than 1 .mu.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: November 12, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Takeo Inoue, Shigeru Kimura, Tutomu Iwatani, Takayuki Yamada, Yukio Ishii, Ryuichi Sugimoto
  • Toner composition for electrophotography
    Patent number: 5573881
    Abstract: A toner composition for electrophotography comprises at least a binder, a coloring agent and optionally a low molecular weight wax in an amount ranging from 0.5 to 20 parts by weight per 100 parts by weight of the binder as essential components wherein the binder comprises, as a principal component, a resin mixture prepared by heating a resin solution comprising a styrene resin and a block copolymer which comprises blocks derived from at least one member selected from ethylenic hydrocarbons and conjugated diene hydrocarbons and blocks derived from styrene and/or a hydrogenated product thereof in an amount ranging from 0.1 to 20 parts by weight per 100 parts by weight of the styrene resin to remove the solvent. The low molecular weight wax may be included in the binder.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 12, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shoji Kawasaki, Nobuhiro Hirayama, Kenji Uchiyama, Hisatomo Sato, Hiromi Akiyama, Katuo Uramoto
  • Polyimide based resin composition
    Patent number: 5571875
    Abstract: A molding resin composition comprising 99.9 to 50% by weight of polyimide represented by the formula: ##STR1## and 0.1 to 50% by weight of polyether ketone resin and/or polyester resin, and more particularly comprising the polyester resin capable of forming an anisotropical molten phase at a temperature of 420.degree. C. or less, and a polyimide-based molding resin composition which comprises the said resins and other additives such as phenolic resin, fluororesin, graphite, carbon fibers, aromatic polyamide fibers, potassium titanate fibers and a crystallization accelerator, and is excellent in thermal resistance, chemical resistance, mechanical strength and processability.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 5, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshihiko Tsutsumi, Toshiyuki Nakakura, Shuichi Morikawa, Toshiaki Takahashi, Atsushi Morita, Yoshihisa Gotoh
  • Polymer containing monomer units of chemically modified polyaspartic acids or their salts and process for preparing the same
    Patent number: 5571889
    Abstract: A polymer containing the following monomer unit (I) and/or (II): ##STR1## and a process for preparing the polymer which comprises, in ring opening reaction of the polysuccinimide, opening the ring of polysuccinimide by using an amino acid ester having an extremely high reactivity in place of an .alpha.-amino acid having an extremely low reactivity. The polymer is characterized by having no irritation to organisms (e.g., eyes and skin), and for example, the polymer is useful in the industrial fields of fields of medical supplies, health, beauty and sanitary aids, quasi-pharmaceuticals, and the like.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: November 5, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshio Katoh, Akinori Nagatomo, Hiroaki Tamatani, Masanobu Ajioka, Akihiro Yamaguchi
  • Diguanamines and preparation process, derivatives and use thereof
    Patent number: 5569726
    Abstract: Provided by the present invention are novel diguanamine derivatives, led by 2,5/2,6-bis(4,6-diamino-1,3,5-triazin-2-yl)-bicyclo[2.2.1]heptanes and 1,3/1,4-bis(4,6-diamino-1,3,5-triazin-2-yl)-cyclohexanes, and derivatives thereof, applications of these compounds in fields such as adhesives and paints, utilization of these compounds in flame-retarding, thermal stabilization and compatibilization methods of resins, thermosetting molding compositions and thermosetting expansion-molding compositions making use of these compounds, as well as polymeric microspheres also using these compounds. These compounds are expected to find wide spread industrial utility as various excellent properties can be obtained by using them.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: October 29, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tetsuya Oishi, Jin Suzuki, Kouhei Ohkawa, Satoshi Furusawa, Hiroshi Ono, Kazuo Sugazaki
  • Process for Preparing block copolymer of monoolefin
    Patent number: 5563219
    Abstract: A process for preparing a block copolymer of an .alpha.-olefin and a vinyl compound is here disclosed which comprises the steps of polymerizing an olefin selected from ethylene and the .alpha.-olefin having 3 or more carbon atoms by the use of a divalent or a trivalent rare earth metal complex, and then polymerizing a vinyl compound, a vinylidene compound or a lactone. According to the process of the present invention, a polar group can be introduced into a polyolefin, whereby the characteristics of the polymer can be effectively improved.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: October 8, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hajime Yasuda, Eiji Ihara