Inorganic rare earth pigments/colorants and synthesis/applications thereof
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United States of America Patent
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Sep 4, 2001
Issued Date -
N/A
app pub date -
Feb 12, 1996
filing date -
Mar 3, 1993
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Expired
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Abstract
Thermally/chemically stable and nontoxic inorganic pigments/colorants, characteristically green and well suited for the coloration of a wide variety of materials and substrates, for example, plastics, ceramics, etc., comprise at least one mixed oxide of the formula: R.sub.2 M.sub.x M'.sub.y O.sub.5 in which R is at least one element selected from among yttrium and a rare earth having an atomic number ranging from 62 to 71, inclusive, M and M', which may be identical or different, are each at least one metallic element exhibiting at least one valence state of +2, and x and y are numbers, the sum x+y of which is equal to 2.
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