High gloss calcium carbonate coating compositions and coated...

D - Textiles – Paper – 21 – H

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Details

D21H 19/38 (2006.01) D21H 23/22 (2006.01) D21H 19/40 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2470848

A paper coating pigment is provided which includes a blend of a first and a second discrete aragonitic precipitated calcium carbonate (PCC) particles. The first particles of the blended pigment have an average particle size (APS) of about 0.4 microns and the second particles of the blended pigment have an average particle size (APS) of about 0.5 microns. The blended pigment preferably includes a weight ratio of about 50:50 to about 80:20 with a 60:40 weight ratio being most preferred, respectively, of the first 0.4 micron particles to the second 0.5 micron particles. Also provided are a method for preparing coated paper, which includes preparing the blended aragonitic PCC pigment, adding a binder, and applying the pigment to the paper basestock in a slurry containing a binder and or additives. Preferably, blended aragonitic precipitated calcium carbonate pigment is present in an amount of from about 30 weight percent to about 85 weight percent of the mixture with about 70 weight percent to about 15 weight percent balance being clay prior to preparing the slurry.

Cette invention concerne un pigment pour revêtement de papier comprenant des premières et des secondes particules de carbonate de calcium précipité (PCC) aragonitiques séparées. Les premières particules du pigment mélangé ont une taille unitaire moyenne d'environ 0,4 micron, les secondes particules une taille unitaire moyenne d'environ 0,5 micron. Le pigment mélangé se caractérise par un rapport de poids compris de préférence entre environ 50/50 et 80/20, un rapport de poids de 60/40 étant de loin préférable entre les premières particules de 0,4 micron et les secondes particules de 0,5 micron, respectivement. L'invention concerne également un procédé de préparation du papier couché, qui consiste à : préparer le pigment PCC aragonitique mélangé, ajouter un liant, et appliquer le pigment sur le papier de base dans une suspension qui renferme le liant et des additifs. Le pigment de carbonate de calcium précipité aragonitique mélangé représente en poids de 30 à 85 % du mélange, le restant de 70 à 15 % en poids étant constitué par de l'argile avant préparation de la suspension.

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