Opacifying kaolin pigments and process for making same by reacting with sodium hydroxide in water
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United States of America Patent
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Feb 18, 1992
Grant Date -
N/A
app pub date -
Apr 21, 1989
filing date -
Apr 21, 1989
priority date (Note) -
Expired
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Abstract
An opacifying pigment with enhanced light scattering properties for use as a paper coating or filler material is produced by reacting kaolin in the presence of water with sodium hydroxide or potassium hydroxide at a temperature in excess of 60.degree. C. The kaolin is reacted with the hydroxide in a concentration to produce a molality of at least 0.1.
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