Titanium dioxide pigments

Details Titanium dioxide pigments Titanium dioxide pigments

C - Chemistry, Metallurgy

09

C

C09C 1/36 (2006.01) C09C 3/06 (2006.01)

Patent

CA 2180688

A method for the manufacture of a titanium dioxide pigment comprises mixing a suspension of titanium dioxide with a reagent formed by reacting concentrated phosphoric acid with aluminium or an aluminium compound at elevated temperature and adding an alkaline compound to the suspension until a pH value of at least 3.5 is achieved. A novel pigment which can be prepared by the method of the invention comprises titanium dioxide, the particles of which have a surface coating of aluminium phosphate in which the molar ratio of aluminium to phosphorus lies in the range 1.8:1 to 1:1.4 Al:P. The pigments prepared according to the invention are useful in the preparation of paper laminates.

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