Process for coating titanium dioxide pigments
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United States of America Patent
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Nov 24, 1992
Grant Date -
N/A
app pub date -
Jun 26, 1990
filing date -
Jun 26, 1989
priority date (Note) -
Expired
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Abstract
The object of the invention is a process for coating a titanium dioxide pigment according to which a dispersion of titanium dioxide in water is formed, optionally in the presence of a dispersing agent, such as a water soluble silicate and/or an aminoalcohol, whereafter to the titanium dioxide pigment dispersion (1) an acidic hydrolysable titanium compound in an amount of 0.1 to 1.5% by weight calculated as TiO.sub.2, (2) a water soluble phosphate in an amount of 0.1 to 1.0% by weight calculated as P.sub.2 O.sub.5, (3) an acidic hydrolysable zirconium salt in an amount of 0.1 to 1.4% by weight calculated as ZrO.sub.2, is added, the slurry is made alkaline with a base, and (4) a water soluble hydrolysable alkaline aluminium compound is added in an amount of 0.5 to 5.5% by weight calculated as Al.sub.2 O.sub.3, whereby all the percentages by weight are calculated from the weight of the TiO.sub.2 -pigment and the alkaline slurry formed is neutralized with an acid and the coated titanium dioxide pigment is recovered. The produced pigment has excellent gloss and weather resistance properties.
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