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, 117/46.1

C09C 1/36 (2006.01)

Patent

CA 1183410

ABSTRACT IMPROVED PIGMENTS AND THEIR PREPARATION Titanium dioxide pigment having a high durability when used in paints comprises a particulate core of rutile titanium dioxide having an inner coating of dense amorphous silica on which is carried an outer coating of a hydrous oxide of zirconium. Optionally the pigment has an outer coating of a hydrous oxide of aluminium. The amount of dense amorphous silica is up to 12% by weight expressed as SiO2 and the amount of hydrous oxide of zirconium is up to 5% expressed as ZrO2 on the weight of TiO2. The outer coating of hydrous oxide of aluminium can be present in an amount of up to 6% by weight expressed as Al2O3 on the weight of TiO2. A combination of these coatings has been found to be extremely advantageous in producing a paint containing the pigment having a very good durability and resistance to weathering.

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