Patents Assigned to Mitsui
  • Readily processable polyimide and preparation process of same
    Patent number: 5268447
    Abstract: A readily melt processable polyimide obtained by reacting diamine represented by the formula: 4,4' ##STR1## wherein n is an integer of 1 or 2, with 3,3'4,4' -diphenylethertetracarboxylic dianhydride and/or 4,4' -(p-phenylenedioxy)diphthalic dianhydride or a mixture of these tetracarboxylic acid dianhydrides and pyromellitic dianhydride in the presence of phthalic anhydride.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: December 7, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shoji Tamai, Masahiro Ohta, Akihiro Yamaguchi
  • Process for producing .alpha., .beta.-unsaturated carboxylic acid
    Patent number: 5268506
    Abstract: An .alpha., .beta.-unsaturated carboxylic acid is produced by catalytically reacting an .alpha.-hydroxycarboxylic acid amide of the formula (1), ##STR1## where R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl groups, provided that at least one of R.sub.1 and R.sub.2 is the alkyl group, with water in the presence of a solid acid catalyst containing a high surface area rare earth phosphate anhydride having the monoclinic system structure producible by heating a rare earth phosphate of the hexagonal system structure at 60.degree.-200.degree. C. in a solution of an inorganic acid, an inorganic acid salt and/or an inorganic acid ester where the molar ratio of the inorganic acid component to the rare earth phosphate of the hexagonal system structure is 0.5-400.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: December 7, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Minato Karasawa, Takeshi Hiraiwa, Sinji Tokunoh, Hiroharu Kageyama, Kanemitsu Miyama, Masamitsu Inomata
  • Iron based alloy having low contents of aluminum silicon, magnesium, calcium, oxygen, sulphur, and nitrogen
    Patent number: 5268141
    Abstract: An iron base alloy is disclosed which consists essentially of 0.005%-7.0% of aluminum, 0.005-7.0% of silicon, 0.0001%-0.005% of magnesium, 0.0001-0.005% of calcium, 0.001%-0.002% of oxygen, 0.0001-0.002% of sulphur, and 0.0005%-0.003% of nitrogen, less than 2% of carbon, minor amounts of phosphorous and manganese and the remainder iron.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: December 7, 1993
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kenichi Kusumoto, Makoto Ebata
  • Process for producing polypropylene and stretched polypropylene film
    Patent number: 5266636
    Abstract: A process for producing polypropylene, which comprises preliminarily polymerizing 3-methylbutene-1 in the presence of a catalyst system formed from[A] a solid titanium catalyst component containing magnesium, titanium, halogen and polycarboxylic acid esters as essential components,[B] an organoaluminum compound, and[C] an organosilicon compound represented by the general formula R.sub.n Si(OR').sub.4-n wherein R and R' represent a hydrocarbon group, and 0<n<4, the amount of the 3-methylbutene-1 preliminarily polymerized being 0.1 to 100 g per gram of the solid titanium catalyst, and thereafter, polymerizing propylene or copolymerizing propylene and an alpha-olefin in the presence of the catalyst used in the preliminary polymerization to such an extent that the amount of the monomer or monomers polymerized is from 1,000 to 100,000 times the amount of the 3-methylbutene-1 preliminarily polymerized.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: November 30, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Mamoru Kioka, Masaya Yamada, Masanobu Ishiyama, Masao Nakano, Akinori Toyota
  • Resin composition
    Patent number: 5266654
    Abstract: A resin composition for sealing semiconductors which comprises an organic component (A) which contains (a) a polymaleimide compound represented by the formula (I): ##STR1## wherein R.sub.1 is a m-valent organic group having two or more carbon atoms and m is an integer of two or more and (b) a phenolic aralkyl resin represented by the formula (II): ##STR2## wherein X is a divalent group having the formula ##STR3## and n is an integer of from 0 to 100, or contains a mixture of the phenolic aralkyl resin and a phenol, and component (B) which contains an inorganic filler.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: November 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Mikio Kitahara, Koichi Machida, Takayuki Kubo, Motoyuki Torikai, Koutarou Asahina, Junsuke Tanaka, Akihiro Yamaguchi
  • Electrophotographic toner composition
    Patent number: 5266434
    Abstract: The present invention provides an electrophotographic toner composition comprising a binder and a colorant. At least 70 wt. % of the binder are soluble in THF, the number average molecular weight (Mn) and Z average molecular weight (Mz) of the THF-soluble portion of the binder as measured using THF are 2,000-15,000 and at least 400,000, respectively. The particle size of the binder has been controlled so that D.sub.75 is not greater than 2.5 mm, D.sub.25 not smaller than 0.15 mm and D.sub.75 /D.sub.25 at least 1.5. The toner composition does not have variations from one lot to another. The quantity of electricity to be charged during a copying operation changes little. The picture quality can be maintained constant even during a long-time copying operation.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: November 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Nobuhiro Hirayama, Kenji Uchiyama, Shoji Kawasaki, Hisatomo Sato, Hiromi Akiyama
  • Olefin polymerization catalyst and process for the polymerization of olefins
    Patent number: 5266544
    Abstract: In accordance with the present invention, there are provided olefin polymerization solid catalysts comprising[A] a solid titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients, said catalyst component having supported thereon[B] a transition metal compound containing a ligand having a cycloalkadienyl skeleton and, if necessary,[C] an organoaluminum oxy-compound.In accordance with the invention, there are also provided olefin polymerization solid catalysts comprising[i] a solid containing a transition metal compound containing a ligand having a cycloalkadienyl skeleton, said solid having supported thereon[ii] a titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients and, if necessary,[iii] an organoaluminum oxy-compound.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: November 30, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Toshiyuki Tsutsui, Takashi Ueda
  • Flexible printed circuit board having a metal substrate
    Patent number: 5266746
    Abstract: A flexible circuit board including a flexible substrate having an insulating polyimide sheet and a wiring pattern portion formed in a mounting portion and a wiring pattern portion formed in a connecting portion, and a metal substrate on which only the mounting portion of the flexible substrate is secured by means of a thermoplastic polyimide film. Electronic devices are mounted on the mounting portion of the flexible substrate and heat generated by the electric devices can be effectively dissipated through the metal substrate. The connecting portion of the flexible substrate can be connected to an external circuit by means of a connector provided at an edge of the connecting portion. Since the connecting portion is not secured to the metal substrate, connector pins having a large mechanical strength can be used and the connecting portion can be bent at will.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: November 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kunio Nishihara, Yoichi Hosono, Takayuki Ishikawa
  • Butene-1 copolymers and resin compositions containing the same
    Patent number: 5266641
    Abstract: Copolymers of butene-1 and propylene, having specific physical properties and substantially a syndiotactic structure; and easily heat-sealable polypropylene resin compositions comprising 5-50 parts by weight of one of the copolymers and 95-50 parts by weight of a stereoregular crystalline propylene-ethylene copolymer or propylene ethylene-C.sub.4-12 -.alpha.-olefin copolymer having specific compositions and melt flow index.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: November 30, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa, Kouji Kitabayashi
  • Natural red coloring matter and its processing method
    Patent number: 5264212
    Abstract: Impurities containing a pungent taste component are removed from a hot red pepper oleoresin as a starting material therefrom by a supercritical gas extraction method using a carbon dioxide as an extracting reagent, and the extraction residue is used as a red coloring matter. Even when the hot red pepper is used as the raw material, the invention can provide a natural red coloring matter evaluated as having "no pungent taste" by an organoleptic test. When the natural red coloring matter is prepared from the hot red pepper as the raw material by the supercritical gas extraction method, the invention can drastically reduce the gas pressure of the extracting reagent in comparison with the prior art.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: November 23, 1993
    Assignees: Mitsui & Co. Ltd., Mohri Oil Mill Co. Ltd.
    Inventors: Akira Mohri, Katsumi Morikawa, Toshihiko Matsuya, Setsuo Sato
  • Pyrimidines and their pharmaceutical acceptable salts, and their use as medicines
    Patent number: 5264435
    Abstract: 2,6-di-, 2,4,6-, 2,5,6-tri- or 2,4,5,6-tetra-substituted pyrimidines, and 2,6-di-substituted pyridines. These compounds are useful for treatment of neurological deseases.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: November 23, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Akira Mizuchi, Kazutoshi Horikomi, Tadayuki Sasaki, Akira Awaya, Ikuo Tomino, Noriaki Kihara, Takumi Kitahara
  • Process for producing highly pure phenol
    Patent number: 5264636
    Abstract: A process for producing a highly pure phenol, in which a crude phenol obtained from an acid-decomposition product of cumene hydroperoxide and having an .alpha.-methylstyrene content of 15% by weight or less is catalytically treated with an acidic .gamma.-alumina catalyst having a specific surface area of 80 to 400 m.sup.2 /g and an acid strength, according to Hammett's acidity function (Ho), of 3.ltoreq.Ho.ltoreq.6.8, in order to convert aliphatic and aromatic carbonyl compounds contained in the crude phenol into high-boiling compounds without causing the substantial formation of a dimer of .alpha.-methylstyrene contained in the crude phenol, and then, a phenol and the so-formed high-boiling compounds were separated by distillation.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: November 23, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Tatsuo Shirahata, Tetsuo Imamura
  • Dialkoxymethylimidazolidine derivatives
    Patent number: 5264584
    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: September 14, 1992
    Date of Patent: November 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kenji Kodaka, Katsutoshi Kinoshita, Michihiko Nakaya, Koichi Ebihara, Shirou Shiraishi, Eiichi Yamada, Satoshi Numata
  • Bone cement composition, cured product thereof, implant material and process for the preparation of the same
    Patent number: 5264215
    Abstract: Disclosed is a bone cement composition comprising polyalkyl methacrylate derived from methacrylate having an alkyl group of 1-4 carbon atoms, hydroxyapatite, alkyl methacrylate having an alkyl group of 1-4 carbon atoms, 4-(2-methacryloyloxyethyl)trimellitic acid or anhydride thereof, and a polymerization initiator. Also disclosed are a cured product of the composition, an implant material using the composition and a process for the preparation of the implant material.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: November 23, 1993
    Assignees: Nobuo Nakabayashi, Mitsui Petrochemical Industries, Ltd., Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Nobuo Nakabayashi, Kazuhiko Ishihara, Takashi Yamamoto
  • Myoinsitol derivatives, process for preparing same, phosphorylating agent, and its utilization
    Patent number: 5264605
    Abstract: A process for preparing myoinositol polyphosphoric acid from myoinositol via a polyacylmyoinositol, a process for preparing a polysilyl-polyacylmyoinositol from a polyacylmyoinositol, and a process for preparing an optically active myoinositol polyphosphoric acid from the above product or a polysilylmyoinositol.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: November 23, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Shoichiro Ozaki, Yutaka Watanabe
  • Thermoplastic resin composition
    Patent number: 5262485
    Abstract: A thermoplastic resin composition according to the present invention comprises a polymer comprising recurring units derived from a polycyclic (meth)acrylate represented by the following formula [I] and a soft polymer in the proportion by weight of the polymer to the soft polymer of 99:1 to 40:60 ##STR1## wherein m is 0 or a positive integer, n is 0 or 1, R is hydrogen or methyl, R.sup.1 -R.sup.18 are independently an atom or a group selected from the group consisting of hydrogen, halogen and hydrocarbon groups, R.sup.15 -R.sup.18, linked together, may form a monocyclic or polycyclic group which may have a double bond, or an alkylidene group, p is 0 or 1, and R.sup.a and R.sup.b each independently represent a hydrogen atom or a hydrocarbon group when p is 1.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventor: Yohzoh Yamamoto
  • Information recording discs
    Patent number: 5263016
    Abstract: An information recording disc including a plurality of disc substrates (2), at least one of which has a recording medium containing layer (1), two pieces of hubs mounted over the center hole of said disc substrates on both sides thereof, each hub having a portion to be inserted into said center hole and a flange portion to cover a portion of said disc substrate in the vicinity of said center hole, and an adhesive layer (13, 14) formed between said hubs and said disc substrates and between said two hubs. An adhesive layer (7) laminates the substrates (2a, 2b) to one another.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Takeshi Minoda, Akira Todo, Toshio Kimura, Masayoshi Kurisu
  • Diffusion reflector
    Patent number: 5263042
    Abstract: A diffusion reflector is formed of mica ceramics or fluorine plastics containing barium sulfate, on the surface of which gold or silver is vapor deposited to enhance a diffusion reflectance. A reflective cylinder is formed from said diffusion reflector, and laser rods and lamps are arranged in an internal space of the reflective cylinder to form a solid laser device. Thereby, light can be diffused without focussing light within the reflective cylinder, and the laser rods can be uniformly excited.
    Type: Grant
    Filed: July 16, 1991
    Date of Patent: November 16, 1993
    Assignees: Mitsui Petrochemical Industries, Ltd., Miyachi Technos Corporation
    Inventors: Minoru Kojima, Kazuyoshi Sutoh
  • Ethylene/pentene-1 copolymer compositions and their use
    Patent number: 5262228
    Abstract: The ethylene/pentene-1 copolymer composition of the present invention comprises an ethylene/pentene-1 copolymer satisfying specific requests, and a high-pressure polyethylene, polyethylene having a density of greater than 0.935 or low crystalline .alpha.-olefin random copolymer. This composition is excellent in transparency, moldability, heat sealing property at low temperature and tear property, and are particularly useful for packaging film material.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: November 16, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Masaki Kohyama, Masaya Yamada
  • Actuator of vehicle door lock device
    Patent number: 5261711
    Abstract: An actuator of a vehicle door lock device, which includes an output shaft adapted at one end to be coupled with to a lock lever of the lock device, a sector arm for rotating the output shaft, a reversible motor for rotating the sector arm around said output shaft through speed reduction gears and a plastic-made housing for accommodating the output shaft, the sector arm and the reversible motor. The sector arm has, on an inner surface of its outer arc-shaped flange, an inner toothed portion which meshes with a final gear of the reduction gears and an arc hole centering the output shaft. An intermediate shaft for supporting the final gear is arranged in parallel with the output shaft and projects through the arc hole.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsui Kinzoku Kogyo Kabushiki Kaisha
    Inventors: Tetsuro Mizuki, Osamu Hamaguchi, Patrik J. Dowling