Invention Grant
- Patent Title: Method for coating the surface of inorganic solid particles, especially titanium dioxide pigment particles
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Application No.: US12472498Application Date: 2009-05-27
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Publication No.: US09909011B2Publication Date: 2018-03-06
- Inventor: Heiko Frahm , Joerg Friedrich , Mark Kaminski , Erwin Schmeier , Lydia Drews-Nicolai , Volker Juergens
- Applicant: Heiko Frahm , Joerg Friedrich , Mark Kaminski , Erwin Schmeier , Lydia Drews-Nicolai , Volker Juergens
- Applicant Address: DE Leverkusen
- Assignee: Kronos International, Inc.
- Current Assignee: Kronos International, Inc.
- Current Assignee Address: DE Leverkusen
- Agency: Locke Lord, LLP
- Priority: DE102008026300 20080602
- Main IPC: C09C1/36
- IPC: C09C1/36

Abstract:
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, and e) 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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