Aqueous colloidal dispersion based on at least a lanthanide compound and a complexing agent a process for its preparation and use thereof
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United States of America Patent
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Feb 24, 2009
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N/A
app pub date -
Nov 21, 2000
filing date -
Nov 23, 1999
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Abstract
An aqueous colloidal dispersion of at least one lanthanide compound and a complexing agent with a pK (cologarithm of the dissociation constant of the complex formed by the complexing agent and the lanthanide cation) or more than 2.5. The dispersion can also include a compound of at least one other element selected from groups IVa, Va, VIIa, VIIa, VIII, Ib and IIb of the periodic table. A process for preparing the dispersion starts by forming an aqueous mixture comprising at least one lanthanide salt, optionally a salt of one of the elements mentioned, and the complexing agent. A base is added to the mixture, which is heated to obtain the dispersion. Methods that use the dispersion are also disclosed.
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