Patents Assigned to Dong Hwa Titanium Industrial Co.
  • Process for preparing titanium dioxide
    Patent number: 4133864
    Abstract: Titanium dioxide of improved properties for use as a pigment is obtained by a process in which a non-concentrated acid solution containing not more than 200 grams of TiO.sub.2 per liter of solution is partially hydrolyzed and filtered; and additional acid solution slowly added with heating to hydrolyze the remaining TiO.sub.2 and give a product which, on calcining has a color index of about 1500.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: January 9, 1979
    Assignee: Dong Hwa Titanium Industrial Co.
    Inventors: Kosaki Yoshio, Yagi Katsumi, Kura Yasuo