Patents Assigned to Mitsui Toatsu Chemicals
  • Process for the crystallizing L-.alpha.-aspartyl-L-phenylalanine methyl ester from the solution
    Patent number: 5591886
    Abstract: Disclosed herein is a crystallization apparatus for use in the crystallization of L-.alpha.-aspartyl-L-phenylalanine methyl ester. The stirring blade of the crystallization apparatus is composed of a band plate member for sweeping the bottom of a vessel and rod- or band plate-members arranged thereon and extending substantially vertically and horizontally.
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: January 7, 1997
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hiroshi Ichiki, Ryoichi Taneda, Hiroyuki Itoh, Yoshitsugu Kono
  • 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
  • Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same
    Patent number: 5582774
    Abstract: Near-infrared absorbers which contain phthalocyanine derivatives in which the four benzene rings contained in the molecule independently have 1 to 4 substituents are light and thermal resistant and possess high molar extinction coefficients. Such near-infrared absorbers are useful in optical recording media, near-infrared absorption filters, and liquid crystal display devices.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: December 10, 1996
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Incorporated
    Inventors: Hisato Itoh, Katashi Enomoto, Takahisa Oguchi, Tsutomu Nishizawa
  • 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
  • Dyes for color filters, and photosensitive resist resin composition containing the same
    Patent number: 5578419
    Abstract: Dyes suitable for use in the fabrication of color filters are described which contain one or more photopolymerizable substituents preferably represented by the following formula:D-(A-Yn.sup.1)n.sup.2 (1)where D represents a chromphoric nucleus, A denotes a connecting group, Y means the photopolymerizable group, n.sup.1 is 1-10,000, and n.sup.2 stands for an integer of 1-10. Also described are photosensitive resist resin compositions containing the dyes as well as color filters fabricated by curing the photosensitive resist resin compositions.
    Type: Grant
    Filed: April 6, 1994
    Date of Patent: November 26, 1996
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hisato Itoh, Akio Karasawa, Kenichi Sugimoto
  • 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
  • Heat-sensitive transfer sheet containing blue dyestuff
    Patent number: 5567470
    Abstract: A blue dyestuff represented by the formula (2) ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is independently a hydrogen atom, halogen atom, nitro group, hydroxy group, alkyl group which may have a substituent, alkoxy group, alkylsulfonylamino group or alkylcarbonylamino group, and each of R.sub.4 and R.sub.5 is independently an alkyl group which may have a substituent, and a heat-sensitive transfer sheet containing the above-mentioned dyestuff.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: October 22, 1996
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hitoshi Koshida, Isamu Ghoda, Tsukasa Ohyama, Keisuke Takuma
  • 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
  • Mold design and process for producing a multilayer part by injection process molding
    Patent number: 5558883
    Abstract: A molding equipment for making composite molded article having:(a) a fixed side mold having a convex portion integral with a gate; the convex portion being formed according to the shape of the molded article; the gate being used for injecting melted resin into a resin molding space;(b) a movable side mold capable of being moved close to and away from the fixed side mold; the movable side mold having a concave portion; the concave portion being joined with the convex portion of the fixed side mold (1) to form the resin molding space when the molding equipment is clamped;(c) a set of slide cores being mounted between the fixed side mold (1) and the movable side mold; the slide cores being movable toward and away from the fixed side mold; and(d) a skin material setting frame being mounted between the fixed side mold and the slide cores; the skin material setting frame being capable of setting a skin material.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: September 24, 1996
    Assignees: Mitsui Toatsu Chemicals, Inc., Moriroku Kabushiki Kaisha
    Inventors: Tsunetoshi Shinada, Katsuo Wada, Masaki Misumi, Satoru Kurono
  • Carboxylate and heat-sensitive recording material using same
    Patent number: 5559247
    Abstract: A carboxylate is herein disclosed which is represented by the formula (1) or (2) ##STR1## wherein a ring X is an aromatic residue which may have a substituent; the other substitutents are as defined herein. A heat-sensitive recording material comprising this carboxylate is excellent in the stability of the color image and can provide an optically character-readable sharp color image.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: September 24, 1996
    Assignees: Mitsui Toatsu Chemicals, Inc., Yamamoto Chemicals, Inc.
    Inventors: Mansuke Matsumoto, Nobuaki Sasaki, Bunji Sawano, Kiyoharu Hasegawa, Kazuyoshi Kikkawa
  • Decomposable composite material
    Patent number: 5556711
    Abstract: A multilayer composite consisting of aluminum and a resin composition primarily comprising a lactic acid base polymer, is disclosed. The composite material is excellent in mechanical and gas barrier properties and has characteristic of totally decomposing under alkaline conditions.
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: September 17, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Masanobu Ajioka, Katashi Enomoto, Akihiro Yamaguchi, Kazuhiko Suzuki
  • Bisimide compounds, polyimide resin composition prepared therefrom, and carbon fiber-reinforced polyimide resin composition
    Patent number: 5554765
    Abstract: A moldable polyimide resin composition which has melt-flowability and excellent processability in addition to essential heat-resistant of polyimide and comprises an aromatic bisimide compound and polyimide resin. A further aspect relates to a carbon fiber reinforced polyimide resin composition which has excellent mechanical strengths and comprises a carbon fiber coated with aromatic bisimide compound on the surface and the polyimide resin. A still further aspect relates to a novel bisimide compound which is very useful as the aromatic bisimide compound in the composition.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 10, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Masahiro Ohta, Akio Matsuyama, Eiji Senoue, Fumiaki Kuwano, Osamu Yasui, Yasunori Yoshida, Akinori Ryu, Tadashi Kobayashi