Patents by Inventor Yasushi Tokunaga

Yasushi Tokunaga 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: 6566447
    Abstract: The present invention provides a resin composition comprising 50 to 99 percent by weight of a completely amorphous polyester resin (A), and 1 to 50 percent by weight of a graft copolymer (B) obtained by graft-polymerizing a methacrylic acid ester and a vinyl aromatic compound with conjugated diene rubber particles and/or a graft copolymer (C) obtained by graft-polymerizing a methacrylic acid ester and a vinyl aromatic compound with acrylic rubber particles. According to the present invention, a resin composition and a resin sheet specifically suitable for membrane pressing, vacuum pressing, air pressing, and the like are provided, in which the resin composition and the resin sheet have superior properties, such as workability, moldability, impact resistance, transparency, and the like. In addition, plate-out is not significantly observed and whitening during embossing and heat-sealing is unlikely to occur.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: May 20, 2003
    Assignee: Riken Vinyl Industry Co., LTD
    Inventors: Yasushi Tokunaga, Takafumi Nozawa, Etsushi Fukunaga, Yasunori Yamada, Motohiro Shimizu
  • Patent number: 6433081
    Abstract: The present invention provides a resin composition comprising 50 to 99 percent by weight of a completely amorphous polyester resin (A), and 1 to 50 percent by weight of a graft copolymer (B) obtained by graft-polymerizing a methacrylic acid ester and a vinyl aromatic compound with conjugated diene rubber particles and/or a graft copolymer (C) obtained by graft-polymerizing a methacrylic acid ester and a vinyl aromatic compound with acrylic rubber particles. According to the present invention, a resin composition and a resin sheet specifically suitable for membrane pressing, vacuum pressing, air pressing, and the like are provided, in which the resin composition and the resin sheet have superior properties, such as workability, moldability, impact resistance, transparency, and the like. In addition, plate-out is not significantly observed and whitening during embossing and heat-sealing is unlikely to occur.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: August 13, 2002
    Assignee: Riken Technos Corporation
    Inventors: Yasushi Tokunaga, Takafumi Nozawa, Etsushi Fukunaga, Yasunori Yamada, Motohiro Shimizu
  • Patent number: 6183842
    Abstract: A decorative laminated sheet, sequentially comprising (A) a completely amorphous polyester resin layer and (B) a substrate layer composed of a polyolefin resin, a polyvinyl chloride resin, an acrylonitrile-butadiene-styrene resin, an acrylonitrile-styrene-acrylic acid ester resin, an acrylonitrile-ethylene propylene-styrene resin, a methyl methacrylate-butadiene-styrene resin, a polyethylene terephthalate or a completely amorphous polyester resin. Or a decorative laminated sheet comprising a substrate layer composed of (B) a completely amorphous polyester type resin layer and a transfer foil formed thereon.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: February 6, 2001
    Assignee: Riken Vinyl Industry Co., Ltd.
    Inventors: Motohiro Shimizu, Yasushi Tokunaga