C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 1/02 (2006.01) C09C 3/00 (2006.01) D21H 17/64 (2006.01) D21H 17/69 (2006.01) D21H 17/65 (2006.01) D21H 17/67 (2006.01)
Patent
CA 2270769
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 acidic paper, and a process for producing this acid-resistant calcium carbonate is provided. This acid-resistant calcium carbonate composition comprises calcium carbonate and at least about 0.1 % to about 25 % based on the dry weight of the calcium carbonate, of sodium silicate, together with at least 0.1 % to about 25 percent, based on the dry weight of the calcium carbonate, of a weak acid, such as phosphoric acid, formic acid, fluoroboric acid, polyacrylic acid, or alum, or a mixture of weak acids, such as phosphoric acid and polyacrylic acid.
L'invention concerne un forme améliorée de carbonate de calcium qui résiste aux acides, ce qui permet son utilisation comme matériau de charge dans la fabrication de papier neutre à faiblement acide. L'invention concerne également un procédé de production de ce carbonate de calcium résistant aux acides. Cette composition de carbonate de calcium résistante aux acides comprend du carbonate de calcium et au moins 0,1 % environ à 25 % environ - rapporté au poids sec du carbonate de calcium - de silicate de sodium, ainsi qu'au moins 0,1 % à 25 % environ - rapporté au poids sec du carbonate de calcium - d'un acide faible tel que l'acide phosphorique, l'acide formique, l'acide fluoroborique, l'acide polyacrylique, l'alun, ou bien un mélange d'acides faibles tel qu'un mélange d'acide phosphorique et d'acide polyacrylique.
Rpdrogiez. Jose M.
Snowden Kevin
Wu Kuan-Ting
Ecc International Inc.
Sim & Mcburney
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