Colloidal organic sols comprising tetravalent metal oxide/organic acid complexes
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United States of America Patent
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Apr 3, 2001
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Sep 22, 1999
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Feb 21, 1995
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Abstract
Storage-stable colloidal organic sols comprise suspended tetravalent metal oxide particulates in an organic diluent medium, notably cerium dioxide particulates, the tetravalent metal oxide particulates having a particle size d.sub.90 no greater than 200 nanometers and being complexed with at least one amphiphilic organic acid, and either said tetravalent metal oxide particulates comprising agglomerates of crystallites, the d.sub.80 of which being no greater than 5 nanometers and at least 90% of said agglomerates comprising from 1 to 5 crystallites, and/or said at least one amphiphilic organic acid has from 11 to 50 carbon atoms and is branched in at least one of the .alpha.-, .beta.-, .gamma.- or .delta.-positions relative to the atom bearing the acidic hydrogen.
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