Optically whitened clay pigments

Details Optically whitened clay pigments Optically whitened clay pigments

1996-10-08

1997-09-16

Bell, Mark L.

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621811, 1621816, 1621818, 523208, 523500, 523513, 523521, 524445, 524447, D21H 2128

Patent

active

056676395

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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