Titanium dioxide pigment and method of preparation

Details Titanium dioxide pigment and method of preparation Titanium dioxide pigment and method of preparation

1992-04-10

1993-04-20

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106442, C04B 100

Patent

active

052039161

ABSTRACT:
The present invention provides a pigmentary titanium composite having good durability and excellent optical properties. The inventive composite consists essentially of: a particulate titanium dioxide base; a hydrous zirconium oxide layer deposited on the titanium dioxide base; and a hydrous alumina layer deposited on the hydrous zirconium oxide layer. The alumina layer consists essentially of boehmite alumina and/or pseudoboehmite alumina.
The present invention also provides a method for preparing the inventive pigmentary composite. The inventive method comprises the steps of: (a) preparing an aqueous slurry comprising water and a particulate titanium dioxide base; (b) depositing a layer of a hydrous zirconium oxide precipitate on the titanium dioxide base; and (c) depositing a layer of a hydrous alumina precipitate on the layer of hydrous zirconium oxide. The hydrous alumina precipitate consists essentially of boehmite alumina and/or pseudoboehmite alumina.

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