Acid resistant calcium carbonate composition and uses therefor

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/02 (2006.01) C09C 3/10 (2006.01) D21H 17/64 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2230158

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 a mixture of at least about 0.1 percent, based on the dry weight of the calcium carbonate, of a weak base together with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of a weak acid.

L'invention porte sur une forme de carbonate de calcium résistant à l'acide, pour son utilisation en tant que matériau d'apport dans la fabrication d'un papier faiblement acide ou neutre. L'invention concerne également un procédé pour produire ce carbonate de calcium résistant à l'acide. Ce carbonate de calcium résistant à l'acide comprend un mélange d'au moins environ 0,1 pour cent d'une base faible, pourcentage calculé sur le poids à sec du carbonate de calcium, et d'au moins environ 0,1 pour cent d'un acide faible, pourcentage calculé sur le poids à sec du carbonate de calcium.

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