Aluminum phosphate or polyphosphate particles for use as pigments in paints and method of making same
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United States of America Patent
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Oct 27, 2015
Grant Date -
Jul 15, 2010
app pub date -
Feb 12, 2010
filing date -
Aug 30, 2004
priority date (Note) -
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Abstract
An aluminum phosphate or polyphosphate-based pigment product is made by a process comprising contacting phosphoric acid with aluminum sulfate and an alkaline solution to produce an aluminum phosphate based product; and optionally calcining the aluminum phosphate based product at an elevated temperature, wherein the process is substantially free of an organic acid. The aluminum phosphate or polyphosphate-based pigment is amorphous. The amorphous aluminum phosphate or polyphosphate characterized by a bulk density of less than 2.30 grams per cubic centimeter and a phosphorus to aluminum mole ratio of greater than 0.8. The composition is useful in paints and as a substitute for titanium dioxide.
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