Acid tolerant calcium carbonate composition and uses therefor
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United States of America Patent
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Jan 27, 1998
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N/A
app pub date -
Mar 13, 1996
filing date -
Mar 13, 1996
priority date (Note) -
Expired
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Abstract
An improved form of calcium carbonate which is acid tolerant to enable its use as a filler material in the making of neutral to weakly acid paper, and a process for producing this acid tolerant calcium carbonate are provided. This acid tolerant calcium carbonate comprises a mixture of calcium carbonate with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of sodium aluminate together with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of one or more weak acids.
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