Patents Assigned to Mizusawa Kagaku Kozyo Kabushiki Kaisha
  • Patent number: 4324768
    Abstract: Disclosed is a process for the preparation of lead compounds which comprises reacting lead monoxide according to the wet method with an inorganic acid or organic acid in the presence of hydroxylamine under such conditions that the initial pH value of the reaction system is not higher than 7.Lead monoxide according to the wet method has an excellent reactivity with an inorganic acid or organic acid, but it contains higher oxides such as lead dioxide and minium, which cause coloration in lead compound products. According to this process, this undesirable coloration can effectively prevented.
    Type: Grant
    Filed: December 16, 1980
    Date of Patent: April 13, 1982
    Assignee: Mizusawa Kagaku Kozyo Kabushiki Kaisha
    Inventors: Yujiro Sugahara, Hiroyuki Naito, Mamoru Saito, Takashi Mori, Toshio Honma