Pigment composition for paper coating, paper coating using the same and method of coating paper

摘要

A pigment composition for use in coating a paper product such as a solid bleached sulfite product to give a combination of improved sheet brightness and gloss, comprises a blend of at least two particulate inorganic materials namely (a) a high brightness ultrafine kaolin produced from a blocky kaolin clay, the kaolin having a median particle size less than about 0.5 microns ( mu m); and (b) a fine coating precipitated calcium carbonate (PCC), which may be of predominantly aragonite or rhombohedral crystal form, having a median particle size less than about 0.8 microns; the ratio by weight of the PCC to the kaolin being greater than 1.0.