Stabilized calcium carbonate composition using sodium silicate a

Details Stabilized calcium carbonate composition using sodium silicate a Stabilized calcium carbonate composition using sodium silicate a

1996-11-05

2000-07-04

Marcheschi, Michael

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106465, 106466, 106627, 1621811, 1621813, 1621816, 1621817, C09C 102

Patent

active

060833173

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 acidic paper, and a process for producing this acid-resistant calcium carbonate is provided. This acid-resistant calcium carbonate composition comprises calcium carbonate and at least about 0.1% to about 25% based on the dry weight of the calcium carbonate, of sodium silicate, together with at least 0.1% to about 25 percent, based on the dry weight of the calcium carbonate, of a weak acid, such as phosphoric acid, formic acid, fluoroboric acid, polyacrylic acid, or alum, or a mixture of weak acids, such as phosphoric acid and polyacrylic acid.

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