Bulking pigments
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United States of America Patent
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-
Aug 30, 1988
Grant Date -
N/A
app pub date -
Sep 16, 1986
filing date -
Sep 16, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for preparing a heat stable aqueous slurry of a bulking pigment suitable for use in coating or filling paper which comprises preparing a fluid aqueous suspension of particles of kaolin clay, adding thereto a water-soluble cationic polyelectrolyte, the amount of said cationic polyelectrolyte being sufficient to substantially thicken and flocculate said fluid suspension, acidifying the resulting flocculate clay suspension, bleaching the clay in said suspension with a hydrosulfite salt, filtering said acidified suspension to recover bulked clay, washing the filtered clay and adding minimal amounts of a sodium polyacrylate and a nonionic surfactant to the recovered bulked clay to provide a fluid suspension of bulked clay.
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Cited Art Landscape
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