Patents by Inventor Tadashi Asanuma

Tadashi Asanuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20060167726
    Abstract: A system and method for managing the procedure of an office work is capable of saving an individual or a corporation the trouble of managing the procedure of the office work and performing a reasonable and reliable procedure of the office work by collectively managing a submit period of documents and an answer to an administrative organ. A period managing system includes at least a management condition creating unit 1, a management information storing unit 2, a management condition determining unit 3, and a management condition storing unit 4. The period managing system is operated on the basis of period management information stored in the management condition storing unit. The system for managing the procedure of the office work performs document exchange between the client and the administrative organ by exchanging the document with the client and/or the administrative organ while managing the period by the period managing system, thereby managing the procedure of the office work.
    Type: Application
    Filed: June 22, 2004
    Publication date: July 27, 2006
    Applicant: MITSUI CHEMICALS, INC
    Inventors: Tadashi Asanuma, Naoko Hiraizumi
  • Patent number: 6255425
    Abstract: A syndiotactic polypropylene copolymer is disclosed which comprises 70 to 99.9 mole % of propylene and 0.1 to 30 mole % of an olefin other than propylene; in the 13C-NMR spectrum of the syndiotactic polypropylene copolymer, a ratio of the intensity of a peak at about 20.2 ppm to the sum of the intensities of the total peaks attributable to methyl groups in propylene units at about 19-22 ppm being 0.3 or more. Also disclosed are extrusion-molded high-transparency articles, especially films and sheets and blown films, obtained by the extrusion of a polypropylene substantially having a syndiotactic structure.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: July 3, 2001
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Osamu Uchida, Tutomu Iwatani, Shigeru Kimura, Takeo Inoue
  • Patent number: 6197894
    Abstract: An olefin ring-opening metathesis polymer is hydrogenated to obtain a hydrogenated product thereof in high yield.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: March 6, 2001
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadahiro Sunaga, Masumi Okita, Tadashi Asanuma
  • Patent number: 6121394
    Abstract: The present invention is directed to a method for polymerizing an .alpha.-olefin characterized by using a catalyst system which is obtained by reacting a halogenated metallocene compound with an organometallic compound, and then bringing the resultant reaction product into contact with a compound which will be a stable anion by reaction with the reaction product of the halogenated metallocene compound and the organometallic compound.When the method of the present invention is carried out, a polyolefin can be obtained by the use of the inexpensive catalyst in a high activity per unit amount of the catalyst.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: September 19, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Ryuichi Sugimoto, Tadashi Asanuma, Tutomu Iwatani, Katsumi Takeuchi, Osamu Uchida
  • Patent number: 6063725
    Abstract: An olefin polymerization catalyst system comprising an organic transition metal compound and a support, wherein an organic transition metal compound is soluble in an inert organic solvent and a support which is insoluble in the inert organic solvent, and the support comprises an organic high molecular weight compound which contains a specific carbonyl-containing group. The catalyst system can polymerize an olefin in a high activity, provides polymer with high stereoregularity, prevents adhesion or fouling of the polymer generated in the course of polymerization or an organic aluminum oxy compound on the inner wall of the reactor, leads to high bulk density of the polymer and very reduced level of fisheye and/or gel generation on the processed item, can maintain high productivity, can manufacture high quality product, and thus provides extremely high contribution in industry.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: May 16, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadahiro Sunaga, Yukio Ishii, Tadashi Asanuma
  • Patent number: 5952426
    Abstract: A method for preparing molded articles of a crosslinked polyolefin is here disclosed which comprises the steps of mixing polyolefin granules comprising polyolefin granules containing a hydrosilylation catalyst, polyolefin granules containing the copolymer of an alkenylsilane and an olefin, and if necessary, polyolefin granules containing neither the hydrosilylation catalyst nor the copolymer of the alkenylsilane and the olefin, and then heating, melting and molding the mixture in a molding machine.According to the present invention, the molded articles of the crosslinked polyolefin containing no residual crosslinking agent and having improved heat resistance and mechanical strength can be obtained by the easy method which comprises mixing the above-mentioned respective granules, and then heating, melting and molding the mixture.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: September 14, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadashi Asanuma, Kazuhiko Yamamoto, Kaoru Kawanishi
  • Patent number: 5888636
    Abstract: A multi-layer blow molded article of a polypropylene comprising at least two layers, wherein at least one layer of the inner layer or layers comprises a resin composition containing 100-50 parts by weight of a syndiotactic polypropylene with an Mw/Mn of 3.0 or more and 0-50 parts by weight of an ethylene-.alpha.-olefin copolymer elastomer, and the outermost layer comprises a syndiotactic polypropylene with an Mw/Mn of less than 3.0, an isotactic polypropylene with an Mw/Mn of 6.0 or less, a resin composition containing 99-50 parts by weight of either of said polypropylenes and 1-50 parts by weight of an ethylene-.alpha.-olefin copolymer elastomer, or a polypropylene formed by heat degradation of a syndiotactic or isotactic polypropylene and having an Mw/Mn of 3.0 or more.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: March 30, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadashi Asanuma, Shigeru Kimura, Tamio Kawasumi, Shunji Ueda, Masami Hashimoto
  • Patent number: 5840389
    Abstract: A molded article obtained by blow molding a propylene having a substantially syndiotactic structure or a resin composition comprising a polypropylene having a substantially syndiotactic structure and a copolymer of ethylene and propylene, and a multi-layer molded article obtained from this resin composition in which at least one surface of the molded article is a polypropylene layer having the substantially syndiotactic structure.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: November 24, 1998
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tateyo Sasaki, Shosuke Nakanishi
  • Patent number: 5759469
    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: September 25, 1996
    Date of Patent: June 2, 1998
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tateyo Sasaki, Mitsuru Ito, Tetusnosuke Shiomura
  • Patent number: 5637367
    Abstract: A molded article obtained by blow molding a propylene having a substantially syndiotactic structure or a resin composition comprising a polypropylene having a substantially syndiotactic structure and a copolymer of ethylene and propylene, and a multi-layer molded article obtained from this resin composition in which at least one surface of the molded article is a polypropylene layer having the substantially syndiotactic structure.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: June 10, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tateyo Sasaki, Shosuke Nakanishi, Takeo Inoue
  • Patent number: 5624621
    Abstract: A fiber excellent in strength and having an average size of 10,000-0.1 denier can be obtained by extruding a new material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and optionally stretching the resulting extruded material. By using as the raw material a composition consisting of two kinds of polypropylenes each having an intrinsic viscosity .eta..sub.1 or .eta..sub.2, the log(.eta..sub.2 /.eta..sub.1) being more than 0.05 or less than -0.05, and a syndiotactic pentad traction of 0.7 or more at a weight ratio of 95:5-5:95 or a composition consisting of at least 50 parts by weight of a syndiotactic polypropylene having the intrinsic viscosity .eta..sub.1 and a syndiotactic pentad fraction of 0.7 or above and at most 50 parts by weight of an isotactic polypropylene having the intrinsic viscosity .eta..sub.2, the extrudability is improved and the fiber stretching conditions are broadened.
    Type: Grant
    Filed: August 24, 1995
    Date of Patent: April 29, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Shigeru Kimura, Nobutaka Uchikawa, Yoichi Kawai, Keigo Suehiro, Satoshi Fukushima
  • 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
  • Patent number: 5548007
    Abstract: A radiation-resistant polypropylene resin composition is disclosed which comprises a polypropylene having a substantially syndiotactic structure, and if desired, a phosphorus-containing anti-oxidant, an amine-containing anti-oxidant and/or a nucleating agent. Molded articles obtained from this resin composition can be utilized as containers for foods and medicines, and their physical properties scarcely deteriorate during sterilization by radiation.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: August 20, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Shigeru Kimura, Nobutaka Uchikawa, Tetsunosuke Shiomura
  • Patent number: 5548008
    Abstract: A radiation-resistant polypropylene resin composition is disclosed which comprises a polypropylene having a substantially syndiotactic structure, and if desired, a phosphorus-containing anti-oxidant, an amine-containing anti-oxidant and/or a nucleating agent. Molded articles obtained from this resin composition can be utilized as containers for foods and medicines, and their physical properties scarcely deteriorate during sterilization by radiation.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: August 20, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Shigeru Kimura, Nobutaka Uchikawa, Tetsunosuke Shiomura
  • Patent number: 5534595
    Abstract: Disclosed is a syndiotactic propylene copolymer containing 0.01 to 40 mol % of olefin units containing --OH group in the side chain. Of absorption peaks attributed to the methyl groups of the propylene units on an absorption spectrum by .sup.13 C-NMR of the copolymer, the intensity of an absorption peak observed at about 20.2 ppm is 0.3 or more of the intensity of absorption peaks of all the methyl groups attributed to the propylene units. The copolymer is produced by copolymerizing propylene and an alkenylsilane or alkenylborane compound in the presence of a catalyst system comprising an asymmetric ligands-having transition metal compound and an aluminoxane, followed by heat-treating the resulting propylene-alkenylsilane copolymer in the presence of a trialkylamine oxide and KF.HF or oxidizing and decomposing the resulting propylene-alkenylborane compound copolymer. Also disclosed is a resin composition comprising the copolymer and other polyolefin(s).
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 9, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Hiroshi Matsuzawa, Tateyo Sasaki, Kaoru Kawanishi
  • Patent number: 5494996
    Abstract: A polyimide resin composition substantially comprising 1 99.9.about.50 parts by weight of polyimide having recurring structural units of the formula ##STR1## and 2 0.1.about.50 parts by weight of a polyimide which improved melt flowability and is prepared by using 1,3-bis(3-aminophenoxy)benzene or 6,6'-bis(3-aminophenoxy)-3,3,3',3'-tetramethyl-1,1'-spirobiindane as essential diamine component, or polyether pyridine having recurring structural units of the formula: ##STR2## is disclosed. Further, a polyimide based resin composition comprising the polyimide resin composition or a polyimide copolymer obtained by using the above diamines and a fibrous reinforcement is disclosed. These compositions have remarkably good processability, excellent heat stability and repeated fatigue characteristics.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: February 27, 1996
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Shoji Tamai, Yuichi Okawa, Wataru Yamashita, Yoshihiro Sakata, Hideaki Oikawa, Keizaburo Yamaguchi, Tadashi Asanuma, Akihiro Yamaguchi, Mitsunori Matsuo
  • Patent number: 5480965
    Abstract: This invention relates to a novel thermoplastic and amorphous polyimide which is readily soluble in organic solvent, a novel aromatic diamino compound used for the polyimide, a preparation process thereof, a polyimide-based resin composition comprising the thermoplastic polyimide and a fibrous reinforcement, a process for preparing the resin composition, an injection molded article of the resin composition, a polyimide-based composite obtained by molding the above soluble and thermoplastic polyimide in combination with a fibrous reinforcement, and a fibrous reinforcement having a surface modified with the above polyimide.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: January 2, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Wataru Yamashita, Yuichi Okawa, Hideaki Oikawa, Tadashi Asanuma, Yuko Ishihara, Mitsunori Matsuo, Keizaburo Yamaguchi, Akihiro Yamaguchi, Shoji Tamai
  • Patent number: 5478646
    Abstract: A fiber excellent in strength and having an average size of 10,000-0.1 denier can be obtained by extruding a raw material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and optionally stretching the resulting extruded material.By using as the raw material a composition consisting of two kinds of polypropylenes each having an intrinsic viscosity .eta..sub.1 or .eta..sub.2, the log(.eta..sub.2 /.eta..sub.1) being more than 0.05 or less than -0.05, and a syndiotactic pentad fraction of 0.7 or more at a weight ratio of 95:5-5:95 or a composition consisting of at least 50 parts by weight of a syndiotactic polypropylene having the intrinsic viscosity .eta..sub.1 and a syndiotactic pentad fraction of 0.7 or above and at most 50 parts by weight of an isotactic polypropylene having the intrinsic viscosity .eta..sub.2, the extrudability is improved and the fiber stretching conditions are broadened.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: December 26, 1995
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Shigeru Kimura, Nobutaka Uchikawa, Yoichi Kawai, Keigo Suehiro, Satoshi Fukushima
  • Patent number: 5478888
    Abstract: The present invention relates to a process for the preparation of a thermoplastic resin composite comprising conducting polycondensation of a monomer material in a solution of an organic solvent containing an organic solvent soluble polymer to form an aromatic condensation polymer which is insoluble in said organic solvent and a thermoplastic resin composite prepared by the process.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: December 26, 1995
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Naoya Ogata, Takehisa Nakanishi, Tadashi Asanuma
  • Patent number: 5428121
    Abstract: A method for preparing a propylene (co)polymer having a substantially high syndiotactic structure and a desired molecular weight which comprises the step of (co)polymerizing propylene or propylene and a small amount of another olefin by the use of a transition metal compound catalyst having asymmetric ligands in the presence of a specific internal olefin.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: June 27, 1995
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tsutomu Iwatani, Ryuichi Sugimoto, Norihide Inoue, Masahiro Kouno, Tetsunosuke Shiomura