C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/21, 9/39
C01F 11/18 (2006.01) C09C 1/02 (2006.01) D21H 17/00 (2006.01) D21H 17/67 (2006.01) D21H 17/69 (2006.01)
Patent
CA 2035808
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.
Gowling Lafleur Henderson Llp
Minerals Technologies Inc.
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