Spray drying method for preparing kaolin as a pigment extender
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United States of America Patent
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Jan 7, 1992
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N/A
app pub date -
Jan 26, 1990
filing date -
Jan 26, 1990
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Expired
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Abstract
Composite white pigments composed of titanium dioxide (TiO.sub.2) and kaolin are prepared by subjecting kaolin slurry to spray drying with injected gas to promote droplet fluffing and fragmentation. The slurry contains a hydrocolloid suspending agent and a cationic reagent for making the kaolin particles cationic. The frangible dry material thus produced can be blended with TiO.sub.2 particles to produce an extended TiO.sub.2 pigment.
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