Acid-stabilized calcium carbonate, process for its production an

Details Acid-stabilized calcium carbonate, process for its production an Acid-stabilized calcium carbonate, process for its production an

1990-03-09

1991-08-27

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106464, 106499, 106400, 106401, C09C 102

Patent

active

050430173

ABSTRACT:
A form of calcium carbonate, acid-stabilized by the addition to finely divided calcium carbonate of one of a calcium- chelating agent and a conjugate base, such as sodium hexametaphosphate, followed by the addition of a weak acid, such as phosphoric acid, is disclosed. A process for producing this material, and a method for its use in the making of neutral to acidic paper in order to improve the optical properties of the paper are also disclosed.

REFERENCES:
patent: 3704158 (1972-11-01), Rohan
patent: 3873336 (1975-03-01), Lambert et al.
patent: 4115187 (1978-09-01), Davidson
patent: 4175066 (1979-11-01), Shibazaki et al.
patent: 4219590 (1980-08-01), Shibazaki et al.
patent: 4793985 (1988-12-01), Price et al.

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