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

1990-12-17

1992-10-20

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621811, 1621812, 162183, D21H 1769

Patent

active

051567199

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: 2725796 (1955-12-01), Dinius
patent: 2754207 (1956-07-01), Schur

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