Kaolin pigment products

Details Kaolin pigment products Kaolin pigment products

C - Chemistry, Metallurgy

09

C

C09C 1/42 (2006.01) D21H 19/40 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2490837

A pigment product for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin having a particle size distribution such that at least about 80% by weight of the particles have an equivalent spherical diameter less than about 2 p,m and in the range of from about 10% to about 20% by weight of the particles have an equivalent spherical diameter less than about 0.25 wm, the particles have a shape factor in the range of from about 20 to about 36 and the particles have a particle steepness in the range of about greater than about 35, more preferably in the range of about 35 to about 40, and wherein the kaolin is derived from a secondary kaolin source.

L'invention concerne un pigment destiné à être utilisé dans une composition de couchage servant à réaliser un couchage brillant sur du papier. Ledit pigment contient des particules de kaolin traité, la répartition granulométrique étant telle qu'au moins environ 80 % en poids des particules possèdent un diamètre sphérique équivalent inférieur à environ 2 µm, et environ 10 % à environ 20 % en poids des particules possèdent un diamètre sphérique équivalent inférieur à environ 0,25 µm, les particules présentent un facteur de forme compris entre environ 20 et environ 36, ainsi qu'une pente de courbe granulométrique supérieure à environ 35, de préférence située dans une plage comprise entre environ 35 et 40, le kaolin étant dérivé d'une source de kaolin secondaire.

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