Coated titanium dioxide pigments and processes for production and use
    3.
    发明授权
    Coated titanium dioxide pigments and processes for production and use 有权
    涂层二氧化钛颜料及其生产和使用过程

    公开(公告)号:US06342099B1

    公开(公告)日:2002-01-29

    申请号:US09662940

    申请日:2000-09-15

    IPC分类号: C09C136

    摘要: The present invention provides a coated titanium dioxide pigment which includes a base titanium dioxide pigment; a first deposit of a phosphate compound contiguous with the base titanium dioxide pigment; a deposit of a silica or zirconia compound contiguous with the phosphate deposit; a second deposit of a phosphate compound contiguous with the silica or zirconia compound; and a deposit of an alumina compound contiguous with the second phosphate deposit. Titanium dioxide pigments of the present invention are easily dispersible, and display excellent durability and gloss. The present invention also provides processes for preparing coated titanium dioxide pigments which include the steps of: preparing an aqueous slurry of base titanium dioxide pigment, adding a first phosphate compound to the slurry to form a first phosphate coating, adding a silica or zirconia compound to the slurry to form a silica compound coating, adding a second phosphate compound to the slurry, and adding an alumina compound coating to the slurry to form an alumina compound coating, thereby forming the coated titanium dioxide pigment.

    摘要翻译: 本发明提供了包含二氧化钛基颜料的涂覆二氧化钛颜料; 与基础二氧化钛颜料相邻的磷酸盐化合物的第一沉积物; 与磷酸盐沉积物相邻的二氧化硅或氧化锆化合物的沉积物; 与二氧化硅或氧化锆化合物相邻的磷酸盐化合物的第二沉积物; 以及与第二磷酸盐沉积物相邻的氧化铝化合物的沉积物。 本发明的二氧化钛颜料容易分散,显示优异的耐久性和光泽。 本发明还提供了制备涂覆二氧化钛颜料的方法,其包括以下步骤:制备碱性二氧化钛颜料的含水浆料,向浆料中加入第一磷酸盐化合物以形成第一磷酸盐涂层,将二氧化硅或氧化锆化合物加入到 所述浆料形成二氧化硅复合涂层,向所述浆料中加入第二磷酸盐化合物,并向所述浆料中加入氧化铝复合涂层以形成氧化铝复合涂层,从而形成所述涂覆的二氧化钛颜料。