Rare earth polishing compositions
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United States of America Patent
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Jul 24, 1990
Issued Date -
N/A
app pub date -
Jun 25, 1987
filing date -
Dec 27, 1979
priority date (Note) -
Expired
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Abstract
Rare earth glass-polishing compositions of improved homogeneity and reproducibility are prepared by (a) simultaneously continuously admixing a cerium salt solution, a basic solution and a solution of at least one acid and/or one salt, the anion or anions of which being adopted to form insoluble rare earth compounds, the number of equivalents of base being equal to or greater than the number of equivalents of cerium, and the pH of the reaction medium being greater than about 6; (b) filtering the precipitate which results from the reaction medium; (c) drying said recovered precipitate; and (d) calcining said dried precipitate.
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