Patent ID: 6537363
Filing Date: 2003-03-25
Classification: C01P,C09C,D21H

Abstract:
A pigment product for a paper coating composition, said pigment product comprising a particulate kaolin processed from a naturally platy clay having a shape factor of at least 15, said pigment product having particles with a particle size distribution such that at least 85% by weight of the particles have an equivalent spherical diameter less than 2 &mgr;m and not more than 35% by weight of the particles have an esd less than 0.25 &mgr;m and whose particles have a shape factor of at least 50, and wherein said pigment product further comprises a b-fraction component having a shape factor less than 15 and having particles with a particle size distribution such that less than 50% by weight have an esd less than 2 &mgr;m and less than 20% by weight have an esd less than 0.25 &mgr;m.