Surface modified calcium carbonate composition and uses therefor
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United States of America Patent
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Jul 2, 1996
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N/A
app pub date -
Aug 24, 1995
filing date -
Aug 24, 1995
priority date (Note) -
Expired
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Abstract
An improved form of calcium carbonate which is acid resistant to enable its use as a filler material in the making of neutral to weakly acid paper, and a process for producing this acid-resistant calcium carbonate is provided. This acid-resistant calcium carbonate comprises calcium carbonate in admixture with at least about 0.5 to about 10 percent, based on the dry weight of the calcium carbonate, of a cationic salt, together with at least about 0.5 to about 10 percent, based on the dry weight of the calcium carbonate, of an anionic salt.
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