公开(公告)号：EP2303972B1

公开(公告)日：2015-01-14

申请号：EP09757217.6

申请日：2009-05-28

申请人： KRONOS INTERNATIONAL, INC.

发明人： FRAHM, Heiko ,  FRIEDRICH, Joerg ,  KAMINSKI, Mark ,  SCHMEIER, Erwin ,  DREWS-NICOLAI, Lydia ,  JUERGENS, Volker

IPC分类号： C09C1/36

CPC分类号： C09C1/3684 ,  C01P2004/04 ,  C01P2006/60 ,  Y10T428/2991

公开(公告)号：EP2303972A1

公开(公告)日：2011-04-06

申请号：EP09757217.6

申请日：2009-05-28

申请人： KRONOS INTERNATIONAL, INC.

发明人： FRAHM, Heiko ,  FRIEDRICH, Joerg ,  KAMINSKI, Mark ,  SCHMEIER, Erwin ,  DREWS-NICOLAI, Lydia ,  JUERGENS, Volker

IPC分类号： C09C1/36

CPC分类号： C09C1/3684 ,  C01P2004/04 ,  C01P2006/60 ,  Y10T428/2991

摘要： The invention relates to a method for coating the surface of inorganic solid particles in an aqueous suspension, in particular for coating titanium dioxide with SiO
2 . The method comprises the steps: a) deagglomeration of the solid particles situated in an aqueous suspension, b) addition of a water-soluble precursor compound of the coating substance to the suspension, c) homogenization of the suspension in a dispersion apparatus immediately following step b), wherein, in steps a) to c), temperature and pH of the suspension do not change significantly, d) transport of the suspension into a container and precipitation of the coating substance onto the particle surface and optionally application of further coatings, e) removing the solid particles from the suspension. The method leads to a very uniform and closed sheath on the particle surface and to less coating substance which is precipitated out separately.