Silica-coated alkaline earth metal carbonate pigment
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United States of America Patent
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Oct 24, 2000
Grant Date -
N/A
app pub date -
Oct 29, 1998
filing date -
Oct 29, 1998
priority date (Note) -
Expired
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Abstract
A method for forming a silica coating on at least a portion of the surface of alkaline earth metal carbonate particulates in aqueous suspension and the silica-coated alkaline earth metal carbonate so produced are claimed. The claimed method consists of allowing soluble silicate ions in the aqueous phase to slowly react with the alkaline earth metal carbonate surface to form silica micro-particulates on the surface. This silica coating confers upon the composition unique properties among which are pronounced thixotropic behavior when incorporated into an aqueous suspension and increased oil absorption when dry. The pigment produced by this method is especially suited for use as a filler in paper.
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