Patents by Inventor Tetsunosuke Shiomura

Tetsunosuke Shiomura 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).

  • 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: 5677409
    Abstract: Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: October 14, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norihide Inoue, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani, Tetsunosuke Shiomura, Nobuhiro Hirayama
  • Patent number: 5658999
    Abstract: Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: August 19, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norihide Inoue, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani, Tetsunosuke Shiomura, Nobuhiro Hirayama
  • Patent number: 5652315
    Abstract: A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I ##STR1## and (B) a cocatalyst such as an aluminoxane.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: July 29, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norihide Inoue, Tetsunosuke Shiomura, Masahiro Kouno
  • 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: 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: 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: 5439994
    Abstract: A novel transition metal compound represented by the formula ##STR1## (wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A.sup.5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A.sup.1 and A.sup.2 as well as a pair of A.sup.3 and A.sup.4 is respectively bonded to the identical carbon atom in A.sup.5 to form a crosslinking structure; each of R.sup.1 and R.sup.2 is a halogen atom, a hydrogen atom, an alkyl group or a silicon-containing alkyl group having 1 to 10 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group or a halogenated aryl group having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 may be identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 may be mutually identical or different), and a method for polymerizing an olefin in the presence of this compound and a co-catalyst.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: August 8, 1995
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norihide Inoue, Tetsunosuke Shiomura, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani
  • Patent number: 5428127
    Abstract: Disclosed herein is a process for preparing a syndiotactic polypropylene comprising washing with a hydrocarbon solvent a polymer obtained by polymerizing propylene in the presence of a catalyst comprising a transition metal compound having an asymmetric ligand. The slurry of the polymer obtained by the polymerization is treated with a .beta.-dicarboxy compound and an alcohol or with an alcohol containing hydrochloric acid gasunder non-aqueous conditions prior to the washing with a hydrocarbon solvent so that the residue of the catalyst used in the polymerization reaction may be rendered soluble in the hydrocarbon solvent, the properties of the resulting syndiotactic polypropylene are improved greatly.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: June 27, 1995
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Norihide Inoue, Osamu Uchida, Tutomu Iwatani
  • 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
  • Patent number: 5359102
    Abstract: A transition metal compound represented by the formula ##STR1## (wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A.sup.5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A.sup.1 and A.sup.2 as well as a pair of A.sup.3 and A.sup.4 is respectively bonded to the identical carbon atom in A.sup.5 to form a crosslinking structure; each of R.sup.1 and R.sup.2 is a halogen atom, a hydrogen atom, an alkyl group or a silicon-containing alkyl group having 1 to 10 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group or a halogenated aryl group having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 may be identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 may be mutually identical or different), and a method for polymerizing an olefin in the presence of this compound and a co-catalyst.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: October 25, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Norihide Inoue, Tetsunosuke Shiomura, Masahiro Kouno, Yoshiho Sonobe, Kazumi Mizutani
  • Patent number: 5340848
    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: June 9, 1993
    Date of Patent: August 23, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tadashi Asanuma, Shigeru Kimura, Nobutaka Uchikawa, Tetsunosuke Shiomura
  • Patent number: 5314956
    Abstract: Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl groups in the spectrum of the methyl groups measured by .sup.13 C-NMR is 0.7 or more, and a copolymer of ethylene and propylene, and a preparation process thereof.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: May 24, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tutomu Iwatani, Katsumi Takeuchi
  • Patent number: 5278216
    Abstract: A syndiotactic polypropylene resin composition comprising a polypropylene having a substantially syndiotactic structure and a nucleating agent. The syndiotactic polypropylene may be a homopolymer of the propylene, a copolymer of the propylene and a smaller amount of another olefin or a mixture of the above-mentioned (co)polymer and an isotactic polypropylene. The resin composition preferably has a higher crystallization temperature than a polypropylene containing no nucleating agent by 5.degree. C. or more, as measurement is made by a differential scanning thermal analysis.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: January 11, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Takeo Inoue
  • 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
  • Patent number: 5232992
    Abstract: According to the present invention, molded articles can be provided in which a melting point attributed to a syndiotactic polypropylene and measured at a temperature rise rate of 10.degree. C./minute by differential scanning thermal analysis is indicated by a substantially single peak, the aforesaid molded articles being obtained by heating, melting and molding a substantially syndiotactic homopolymer of propylene, a substantially syndiotactic copolymer of propylene and a small amount of another olefin, or a mixture of these polymers and a small amount of a substantially isotactic polypropylene, and then subjecting the molded products to a heat treatment. Furthermore, a method for preparing the above-mentioned molded articles is also provided. The molded articles have high stiffness and impact resistance.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: August 3, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Takeo Inoue
  • Patent number: 5219968
    Abstract: A substantially syndiotactic propylene copolymer which comprises propylene and at least one cyclic diolefin having 6 to 25 carbon atoms or an alkadiene having 6 to 25 carbon atoms and at least one terminal double bond, in the .sup.13 C-NMR spectrum of the copolymer measured in a 1,2,4-trichlorobenzene solution, a peak intensity observed at about 20.2 ppm as the reference of tetramethylsilane at 0.0 ppm being 0.5 or more of the total peak intensity attributed to methyl groups of propylene; the content of the cyclic diolefin or the alkadiene being from 0.01 to 20 mol %; the intrinsic viscosity [.eta.] of the copolymer measured in a tetralin solution at 135.degree. C. being from 0.1 to 10 dl/g.This copolymer can contain an .alpha.-olefin other than propylene, particularly ethylene.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: June 15, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tetsunosuke Shiomura, Tadashi Asanuma, Masashiro Kouno, Norihide Inoue, Satoshi Fukushima, Yoshiho Sonobe, Kazumi Mizutani, Tutomu Iwatani, Ryuichi Sugimoto
  • Patent number: 5212247
    Abstract: Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl groups in the spectrum of the methyl groups measured by .sup.13 C-NMR is 0.7 or more, and a copolymer of ethylene and propylene, and a preparation process thereof.
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: May 18, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tutomu Iwatani, Katsumi Takeuchi
  • Patent number: 5206324
    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: October 3, 1990
    Date of Patent: April 27, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa, Kouji Kitabayashi