C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 1/02 (2006.01) D21H 17/69 (2006.01)
Patent
CA 2235010
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 0.1 percent, based on the dry weight of the calcium carbonate, of an aluminum or magnesium hydroxide, together with at least about 0.1 percent, based on the dry weight of the calcium carbonate, of a mixture of weak acids in admixture with the calcium carbonate.
La présente invention concerne une forme améliorée de carbonate de calcium qui résiste aux acides, afin de permettre son utilisation comme charge dans la fabrication de papier neutre ou faiblement acide, et un procédé de production de ce carbonate de calcium résistant aux acides. Il comprend un mélange d'au moins environ 0,1 %, sur la base de son poids sec, d'un hydroxyde d'aluminium ou de magnésium, avec au moins environ 0,1 %, sur la même base, d'un mélange d'acides faibles en admixtion avec le carbonate de calcium.
Ecc International Inc.
Goudreau Gage Dubuc
Imerys Pigments Inc.
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