Titanium dioxide pigment having a three layer coating of...

Details Titanium dioxide pigment having a three layer coating of... Titanium dioxide pigment having a three layer coating of...

C - Chemistry, Metallurgy

09

C

6/207, 195/33

C09C 1/36 (2006.01)

Patent

CA 1183409

ABSTRACT IMPROVED PIGMENTS AND THEIR PREPARATION Titanium dioxide pigment of improved durability in paints comprises a particulate core of rutile titanium dioxide having an inner coating on the core of an oxide or hydrous oxide of zirconium, and a coating of dense amorphous silica on the inner coating. The pigment optionally has an outer coating of a hydrous oxide of aluminium. The pigments contain the oxide or hydrous oxide of zirconium in an amount of up to 5% expressed as ZrO2 and an amount of dense amorphous silica of up to 12% by weight expressed as S1O2 on the weight of TiO2. The pigments when incorporated in paints have extremely high durability.

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