Patents Assigned to Tohkem Products Corporation
  • Titanium dioxide reduced in volatile water content, process for producing the same, and masterbatch containing the same
    Patent number: 6126915
    Abstract: Titanium dioxide powder with a greatly decreased volatile moisture content can be obtained by surface treating with titanium dioxide powder with addition of a calcium salt and/or a silane coupling agent, or by a surface treatment by addition of an aluminate together with these surface treatments. A masterbatch containing this titanium dioxide powder is of high quality, having no defect due to foam generation upon high temperature processing.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: October 3, 2000
    Assignees: Tohkem Products Corporation, Toyo Ink Manufacturing Co., Ltd.
    Inventors: Makoto Tunashima, Kazuyoshi Muraoka, Kohji Yamamoto, Susumu Miyasita, Noburu Sakuma, Masaru Hosokawa