Patents by Inventor Junji Ohshima

Junji Ohshima 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).

  • Polyacetal compositions having surface gloss reducing effective amounts of core-shell polymers
    Patent number: 5484845
    Abstract: Polyacetal resins can selectively be reduced in terms of surface gloss by the addition of a core-shell polymer. The core-shell polymer which serves as the surface gloss reducing agent is one which has a rubbery polymer as its core, and a glassy vinyl copolymer having an oxygenic group (e.g., a hydroxyl or glycidyl group) as its shell. Preferably, the core-shell polymer is emulsion polymerized in sequential stages to form the core and shell polymers by use of an oligomeric surfactant. The core-shell polymer is most preferably present in the polyacetal compositions in an effective amount of between 1 to 50 parts by weight, based on 100 parts by weight of the polyacetal base resin.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: January 16, 1996
    Assignees: Polyplastics Co., Ltd., Takeda Chemical Indus., Ltd.
    Inventors: Ichiro Sasaki, Takao Teraoka, Junji Ohshima, Toru Katsumata, Koichi Sato