Patents by Inventor Keiji Iio

Keiji Iio 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).

  • Rubber-modified styrene type resin composition excellent in sliding properties
    Patent number: 5185394
    Abstract: A rubber-modified styrene type resin composition excellent in sliding properties which comprises 100 parts by weight of a rubber-modified styrene type resin and 2.2 to 3.2 parts by weight of dimethyl silicone oil having a viscosity ranging from 5,000 to 15,000 centistokes at 25.degree. C., the styrene type resin comprising 3 to 8% by weight of a rubber-like polymer which is present in the form of microgels having an average particle size ranging from 0.6 to 1.2 micron, and having an intrinsic viscosity of 0.53 to 0.65 and the content of methanol-soluble matter in the range of from 0.5 to 1.5% by weight, is herein disclosed. The rubber-modified styrene type resin composition is excellent in its sliding properties and thus does not provide a molded product having poor appearance during molding. The rubber-modified styrene type resin composition is used to form mechanical parts in the fields of household appliances and OA apparatuses.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: February 9, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yuzuru Ishida, Masahiro Mitsuboshi, Haruo Inoue, Ichiro Otsuka, Keiji Iio
  • Resin compositions having improved antistatic properties
    Patent number: 5151457
    Abstract: A resin composition having excellent antistatic properties and practical physical properties. The resin comprises (i) a styrene resin; (ii) a polyethylene oxide having a viscosity-average molecular weight ranging from 15,000 to 1,200,000; (iii) either or both of a (meth) acrylate resin and an oxide selected from the group consisting of titanium oxide, zinc oxide and magnesium oxide; (iv) either a surfactant selected from specific sulfonic acid salts or a surfactant selected from specific alkyl sulfates; and, optionally, (v) a (poly)ethylene glycol having an average molecular weight ranging from 62 to 1,200. The resin composition also provides excellent resistance to hot water.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: September 29, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yuzuru Ishida, Haruo Inoue, Ichiro Otsuka, Masato Takaku, Masahiro Mitsuboshi, Keiji Iio, Atsushi Hashimoto
  • Styrene resin composition excellent in sliding properties
    Patent number: 4987170
    Abstract: A styrene resin composition excellent in sliding properties which comprises 100 parts by weight of a styrene polymer, 2.0 to 4.0 parts by weight of dimethylsilicone oil having a viscosity ranging from 5,000 to 15,000 centistokes at 25.degree. C. and 0.05 to 8 parts by weight of maleic anhydride monomer or 0.05 to 50 parts by weight of a maleic anhydride-styrene copolymer containing at least 5% by weight of maleic anhydride monomer units is herein disclosed. The styrene resin composition is excellent in sliding properties and thus does not provide a molded product having poor appearance during molding. The styrene resin composition is used to form mechanical parts in the fields of household appliances and office automation apparatuses.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: January 22, 1991
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yuzuru Ishida, Masahiro Mitsuboshi, Haruo Inoue, Ichiro Otsuka, Keiji Iio