C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 1/02 (2006.01) D21H 17/66 (2006.01) D21H 17/67 (2006.01) D21H 17/69 (2006.01)
Patent
CA 2230094
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 are provided. This acid resistant calcium carbonate comprises a mixture of at least about 0.5 to about 10 percent of an aluminum salt, based on the dry weight of calcium carbonate, and calcium carbonate. Preferred aluminum salts are aluminum sulfate, aluminum chloride, and polyaluminum chloride.
Cette forme améliorée de carbonate de calcium, résistante aux acides, peut servir de matériau de charge pour fabriquer un papier neutre faiblement acide. On décrit aussi un procédé de production de ce carbonate de calcium résistant aux acides, lequel est constitué d'un mélange d'au moins 0,5 à 10 % d'un sel d'aluminium, calculé en poids sec du carbonate de calcium, ainsi que de carbonate de calcium. Les sels d'aluminium préférés sont le sulfate et le chlorure d'aluminium et le chlorure de polyaluminium.
Ecc International Inc.
Goudreau Gage Dubuc
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