| 摘要 |
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.
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