Dispersion of a rare earth phosphate, and a process for its preparation
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United States of America Patent
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Aug 11, 2009
Grant Date -
May 24, 2007
app pub date -
Dec 14, 2006
filing date -
Dec 8, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention concerns a colloidal dispersion of a phosphate of a rare earth and a process for its preparation. The dispersion is characterized in that it comprises anisotropic and disaggregated or disaggregatable particles of a phosphate of at least one rare earth and an anion of a monobasic acid, soluble in water and with a pKa of at least 2.5. It is prepared by a process in which a solution of a salt of at least one rare earth is mixed with phosphate ions while controlling the pH of the reaction medium to a value in the range 4 to 9 and in the presence of a monobasic acid, soluble in water and with a pKa of at least 2.5; the mixture obtained optionally undergoes a maturing step; the precipitate is then separated from the reaction medium; and said precipitate is then dispersed in water.
First Claim
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