Process for the production of titanium dioxide pigments with high weather resistance
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United States of America Patent
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May 4, 1982
Issued Date -
N/A
app pub date -
Sep 8, 1980
filing date -
Aug 16, 1978
priority date (Note) -
Expired
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Abstract
The production of titanium dioxide pigments with improved chalking resistance and gloss retention by coating with an oxide and/or phosphate of zirconium and of titanium, aluminum and/or silicon, the improvement which comprises coating with zirconium by adding to an aqueous alkaline suspension of the titanium dioxide pigment of alkali metal or ammonium zirconium carbonate complex and slowly precipitating the zirconium by adding a dissolved compound of at least one of titanium, aluminum, silicon and phosphorus.
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