Low brightness functional pigment from process by-product
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United States of America Patent
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Nov 12, 1996
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Dec 28, 1994
filing date -
Jan 18, 1991
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Abstract
A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO.sub.2. After separating the stained TiO.sub.2 from the high brightness kaolin and concentrating the resulting fraction, the material can be processed to produce a low brightness pigment suitable of many applications where lower brightness is desirable, such as coating paper board without mottling.
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