Optically whitened clay pigments
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United States of America Patent
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Dec 24, 1996
Issued Date -
N/A
app pub date -
Apr 6, 1995
filing date -
Oct 27, 1989
priority date (Note) -
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Abstract
This invention involves a method of optically whitening clay minerals to transform their natural yellow tint to increased whiteness. Generally, it has been found that clay materials having low cation exchange capability can be directly reacted with very small amounts of cationic dyes, the apparent whiteness of said clay minerals being substantially increased thereby.
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