Patents by Inventor Yuki Iseki

Yuki Iseki 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).

  • &agr;-olefin-based copolymer, process for the production thereof, and molded article comprising the same
    Patent number: 6420506
    Abstract: An &agr;-olefin-alkenyl aromatic hydrocarbon-diene copolymer, a process for producing the copolymer, which comprises copolymerizing an &agr;-olefin, a mono-alkenyl aromatic hydrocarbon and a diene in the presence of a specific catalyst, and a molded article comprising the copolymer.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: July 16, 2002
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuo Oi, Yuki Iseki, Yasuro Suzuki
  • Ethylene-alkenyl aromatic compound copolymer, process for the production thereof, and molded article thereof
    Patent number: 6388031
    Abstract: An ethylene-alkenyl aromatic compound copolymer, the copolymer having a melt viscosity &eegr;*190 at a shear rate of 100 radian/second at 190° C. of 3.0×103 to 3.0×106 poises, and a molecular weight distribution in terms of weight average molecular weight(Mw) to number average molecular weight(Mn) [Mw/Mn ] of 1.2 to 4.0, and wherein a zero-shear melt viscosity &eegr;*0 (poise) and a characteristic relaxation time &tgr;0 (second) satisfy the relation of the expression (1) below; log &tgr;0>log &eegr;*0−6.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: May 14, 2002
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuo Oi, Yuki Iseki, Yasuro Suzuki
  • Ethylene-based polymer
    Patent number: 6288193
    Abstract: An ethylene-based polymer comprising ethylene and at least one addition polymerizable monomer containing a vinyl compound (A) described below, wherein the ethylene-based polymer has a melting temperature (Tm) of 119 ° C. or lower and, the melt index MI (g/10 minutes) of the ethylene-based polymer and the molar content “m” (mole %) of the vinyl compound (A) satisfy the following formula (1): Vinyl compound (A): a vinyl compound represented by the structural formula CH2═CH—R containing a saturated hydrocarbon group R wherein the substituent R has a steric parameter Es of not less than −2.77 and not more than −1.64 and the substituent R has a steric parameter B1 of not less than 1.53 and not more than 2.90: 0.01≧MI≦18+m1.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: September 11, 2001
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Yuki Iseki, Yasuro Suzuki
  • Method of producing inflation film and said film
    Patent number: 6274691
    Abstract: A method of producing an inflation film, which comprises processing an ethylene polymer or a resin composition containing said ethylene polymer in a die gap at a melting temperature of not more than 170° C., wherein said ethylene polymer is produced by an ionic polymerization method and said ethylene polymer has a density of 0.89 to 0.96 g/cm3, a melting viscosity &eegr;*[170] at 170° C. under a shear rate of 100 rad/sec of 0.001×104 to 3.5×104 poise and a weight proportion a (% by weight) of a cold xylene-soluble portion satisfying the following formula (1): a<4.8×104×(0.95−d)3+106×(0.95−d)4+0.5  formula (1) (wherein a is a weight proportion (% by weight) of a cold xylene-soluble portion of the ethylene polymer and d is a density (g/cm3) of an ethylene polymer).
    Type: Grant
    Filed: October 19, 1998
    Date of Patent: August 14, 2001
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yasuro Suzuki, Yuki Iseki