Acid resistant calcium carbonate composition containing an aluminum salt, uses therefor and processes for its production
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United States of America Patent
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Feb 4, 1997
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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 are provided. This acid resistant calcium carbonate comprises a mixture of at least about 0.5 to about 10 percent of an aluminum salt, based on the dry weight of calcium carbonate, and calcium carbonate. Preferred aluminum salts are aluminum sulfate, aluminum chloride, and polyaluminum chloride.
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