Patents by Inventor Keiko Shichijo

Keiko Shichijo 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: 6399683
    Abstract: A resin composition for extruded forms that has improved workability, and excellent properties with respect to transparency, heat resistance, low-temperature resistance, etc. The composition contains 50 to 99% by weight of component A, which is a copolymer of ethylene and &agr;-olefin, and 1 to 50% by weight of component B, which is an ethylene-containing polymer. The component A has: (a) a melt flow rate (MFR) of 0.1 to 5 g/10 min.; (b) a density D of 0.88 to 0.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: June 4, 2002
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Koji Yamamoto, Hajime Ikeno, Keiko Shichijo
  • Patent number: 6087429
    Abstract: The present invention provides a propylene resin composition having an excellent balance between low-temperature impact resistance and rigidity, and which is suitable for automobile interior and exterior trim parts.The resin composition contains the following components A, B, and C:Component A: 50 to 80% by weight of a crystalline propylene-ethylene block copolymer having an ethylene content of 1 to 15% by weight, and a melt flow rate of 10 to 100 g/10 min.Component B: 5 to 40% by weight of an ethylene-.alpha.-olefin copolymer containing 25 to 70% by weight of an .alpha.-olefin having 4 to 18 carbon atoms, a melt flow rate of 0.01 to 7 g/10 min., and a density of 0.850 to 0.890 g/cm.sup.3Component C: 1 to 30% by weight of talc having an average particle size of 0.1 to 5.mu..
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: July 11, 2000
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Koji Yamamoto, Keiko Shichijo, Hajime Ikeno
  • Patent number: 5811163
    Abstract: An in-mold label which has a thermoplastic resin film base layer (I) having printed matter on its front side and, formed on the back side of the thermoplastic resin base layer (I), a heat sealable resin layer (II) having a lower melting point than the constituent resin of the thermoplastic resin film base layer (I), the constituent resin of the heat sealable resin layer (II) having as its main component an ethylene/.alpha.-olefin copolymer obtained by copolymerizing from 40 to 98 wt % ethylene and from 60 to 2 wt % of an .alpha.-olefin having from 3 to 30 carbon atoms using a metallocene catalyst.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: September 22, 1998
    Assignee: Oji-Yuka Synthetic Paper Co., Ltd.
    Inventors: Akihiko Ohno, Takatoshi Nishizawa, Masaki Shiina, Junichi Yasuda, Hajime Ikeno, Keiko Shichijo
  • Patent number: 5741861
    Abstract: A resin composition containing 50 to 99% by weight of component A, which is a copolymer of ethylene and .alpha.-olefin, and 1 to 50% by weight of component B, which is a high-pressure low-density polyethylene. The component A has (a) a melt flow rate (MFR) of 2 to 30 g/10 min., (b) a density of not more than 0.935 g/cm.sup.3, and (c) a single peak of elution volume indicated by an elution curve obtained by temperature rising elution fractionation, the peak corresponding to a temperature within a range of from 20.degree. C. to 85.degree. C., and the elution curve satisfying a relationship in which the ratio H/W is not less than 1 when H represents the height of the peak and W represents the width of the elution curve at half of the height H. The component B has (a') a melt flow rate of 0.1 to 20 g/10 min., (b') a density of 0.915 to 0.93 g/cm.sup.3, ('c) a memory effect (ME) of not less than 1.6, and (d') a melt tension (MT) of not less than 1.5 g.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: April 21, 1998
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Koji Yamamoto, Hajime Ikeno, Keiko Shichijo
  • Patent number: 5656696
    Abstract: A resin composition for injection molding that has excellent transparency, and also has excellent strength and sufficient flexibility. The composition contains 50 to 99% by weight of component A, which is a copolymer of ethylene and .alpha.-olefin having a carbon number of not less than 4, and 1 to 50% by weight of component B, which is an olefin-containing polymer. The component A has: (a) a melt flow rate (MFR) of 10 to 120 g/10 min.; (b) a density (D) of not more than 0.915 g/cm.sup.3 ; and (c) at least one peak of elution volume indicated by an elution curve obtained by temperature rising elution fractionation (TREF), wherein the peak corresponds to a temperature of not more than 85.degree. C., and the elution curve may also indicate substantial elution volume at temperatures other than the temperature to which the peak corresponds.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: August 12, 1997
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Koji Yamamoto, Keiko Shichijo, Norikazu Komiya
  • Patent number: 5391618
    Abstract: A propylene resin composition comprising:50 to 97% by weight of component (A) which is a propylene polymer having an MFR of 5 to 200 g/10 min, and50 to 3% by weight of component (B) which is an ethylene-.alpha.-olefin copolymer of an .alpha.-olefin content of 10 to 60% by weight and of an .alpha.-olefin having 4 to 18 carbon atoms, said ethylene-.alpha.-olefin copolymer having the following properties (a) to (c):(a): a density of 0.913 g/cm.sup.3 or less,(b): an MFR of 0.01 to 20 g/10 min, and(c): a flexural rigidity according to ASTM D747 of 2,000 kg/cm.sup.2 or less.The composition has improved impact resistance at both room temperature and low temperatures, a good property balance between rigidity and impact resistance, and high moldability.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: February 21, 1995
    Assignee: Mitsubishi Petrochemical Company Limited
    Inventors: Koji Yamamoto, Hajime Ikeno, Keiko Shichijo
  • Patent number: 5385972
    Abstract: A filler-containing resin composition containingcomponent A, which is an ethylene copolymer having (a) a melt flow rate (MFR) of 0.01 to 20 g/10 min.; (b) a density D of not more than 0.935 g/cm.sup.3 ; (c) a single peak of elution volume corresponding to a temperature within a range from 30 to 100.degree. C. with the elution curve satisfying a relationship in which the ratio H/W is not less than 1 when H represents the height of the peak and W represents the width of the elution curve at 1/2 H; and (d) an elution volume Y wherein (1) Y.ltoreq.-4500D+4105 when the density D of the component A is less than 0.91 g/cm.sup.3, but Y.ltoreq.100; or (2) Y.ltoreq.10 when the density D of the component A is not less than 0.91 g/cm.sup.3 ; andcomponent B, which is a particulate inorganic filler having an average particle size of not more than 10 .mu.m, and a bulk density of 0.1 to 0.7 g/cm.sup.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: January 31, 1995
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Koji Yamamoto, Hajime Ikeno, Keiko Shichijo
  • Patent number: 5262233
    Abstract: An agricultural film comprising a thermoplastic resin film containing an ethylene copolymer with a hindered amine in its side chain and having coated thereon an anti-fogging agent comprising an inorganic hydrophilic colloidal substance and a hydrophilic organic compound and an anti-fogging agricultural film comprising a thermoplastic resin film containing an ethylene copolymer with a hindered amine in its side chain and, if desired, further containing a hydrotalcite compound, with an anti-fogging agent coated on the inside surface thereof or incorporated therein. The agricultural films have excellent weather resistance, anti-fogging properties, heat-retaining properties, and transparency.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Kiyomaro Sudo, Seiya Mori, Tadao Okada, Hajime Ikeno, Keiko Shichijo, Shunichi Ohnishi