Titanium dioxide pigments
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United States of America Patent
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Jul 28, 1998
Grant Date -
N/A
app pub date -
Jun 27, 1996
filing date -
Jul 13, 1995
priority date (Note) -
Expired
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Abstract
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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