Method for coating the surface of inorganic solid particles, especially titanium dioxide pigment particles

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United States of America Patent

PATENT NO 9909011
SERIAL NO

12472498

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Abstract

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A method for coating the surface of inorganic solid particles in an aqueous suspension, particularly for coating titanium dioxide with SiO2 includes:

    a) disagglomeration of the solid particles contained in aqueous suspension,b) addition of a water-soluble precursor of the coating substance to the suspension,c) immediately following step b) homogenization of the suspension, where the temperature and pH value of the suspension do not change significantly in steps a) to c),d) feeding the slurry into a tank and precipitation of the coating substance onto the particle surface and, optionally, application of further coatings, ande) separation of the solid particles from the suspension.The method produces to a highly homogeneous and continuous skin on the particle surface, and to less separately precipitated coating substance.

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Patent Owner(s)

Patent OwnerAddress
KRONOS INTERNATIONAL INCLEVERKUSEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Drews-Nicolai, Lydia Cologne, DE 12 74
Frahm, Heiko Leverkusen, DE 4 9
Friedrich, Joerg Leichlingen, DE 16 70
Juergens, Volker Kirchhundem, DE 6 16
Kaminski, Mark Leverkusen, DE 11 52
Schmeier, Erwin Engelskirchen, DE 1 8

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