Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1995-08-24
1996-07-02
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106401, 1621812, 1621813, 1621811, 423430, C09C 102
Patent
active
055318215
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.
REFERENCES:
patent: 4242318 (1980-12-01), Brahm et al.
patent: 4610801 (1986-09-01), Matthews et al.
patent: 5007964 (1991-04-01), Tsukisaka et al.
patent: 5043017 (1991-08-01), Passaretti
patent: 5221435 (1993-06-01), Smith, Jr.
Bell Mark L.
ECC International Inc.
Marcheschi Michael
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