Acid tolerant calcium carbonate composition and uses therefor

Details Acid tolerant calcium carbonate composition and uses therefor Acid tolerant calcium carbonate composition and uses therefor

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01) C09C 3/00 (2006.01) C09C 3/06 (2006.01) C09C 3/10 (2006.01) D21H 17/66 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2248609

An improved form of calcium carbonate which is acid tolerant to enable its use as a filler material in the making of neutral to weakly acid paper, and a process for producing this acid tolerant calcium carbonate are provided. This acid tolerant calcium carbonate comprises a mixture of calcium carbonate with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of sodium alimunate together with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of one or more weak acids.

Forme améliorée de carbonate de calcium résistante aux acides, pouvant être utilisée comme charge dans la fabrication de papier neutre à faiblement acide, et procédé de production de ce carbonate de calcium tolérant aux acides. Ce carbonate de calcium tolérant aux acides contient un mélange de carbonate de calcium avec au moins environ 0,1 pour cent d'aluminate de sodium en poids à sec du carbonate de calcium, ainsi qu'au moins 0,1 pour cent d'un ou plusieurs acides faibles en poids à sec de carbonate de calcium,.

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