Kaolin clay pigment for paper coating and method for...

C - Chemistry – Metallurgy – 09 – C

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C09C 1/42 (2006.01) C04B 14/10 (2006.01) C04B 33/04 (2006.01) C04B 33/14 (2006.01) C09D 11/02 (2006.01) D21H 19/40 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2477412

The present invention provides kaolin clay pigments having at least the following characteristics: Brightness (GE): at least about 89.0; Shape Factor: at least about 30; Brookfield viscosity, measured at 20 rpm and at less than or equal to about 65 % solids: about 100 to about 700 centipoise; and Hercules viscosity, measured at 18 dynes and at less than or equal to about 65 % solids: about 200 rpm to about 1000 rpm. Preferred kaolin sources include Brazilian kaolins, especially Rio Capim kaolins. The kaolin pigments of the present invention possess a combination of optical and physical properties, such as brightness, printability, and transfer efficiency, not previously seen in existing commercial products. They are useful, e.g., in paper filler and coating compositions, ink compositions, and printing applications, especially rotogravure printing.

L'invention concerne des pigments de kaolins présentant au moins les caractéristiques suivantes : luminosité (GE) d'au moins environ 89,0 ; Facteur de forme d'au moins environ 30 ; viscosité Brookfield d'environ 100 à environ 700 centipoises, mesurée à 20 tr/min et avec au moins environ 65 % de solides; et viscosité Hercules d'environ 200 tr/min à environ 1 000 tr/min, mesurée à 18 dynes et avec au moins environ 65 % de solides. Les sources de kaolins préférées sont les kaolins du Brésil, notamment les kaolins de la rivière Capim. Les pigments de kaolins de l'invention possèdent une combinaison de propriétés optiques et thermiques, telles que la luminosité, l'imprimabilité, l'efficacité de transfert, n'existant pas dans les produits disponibles dans le commerce. Ils sont utiles, entre autres, dans des compositions d'agent de charge pour papier et de couchage, et dans des applications d'impression, notamment l'impression par rotogravure.

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