Pigment materials and their use in coating compositions

Abstract

A pigment material for use in a coating composition suitable for coating a sheet material to be printed by an electrophotographic printer which pigment material comprises a blend of Components A and B as follows: Component A: a fine pigment material suitable for gloss coating of a sheet material the pigment material comprising particles at least 80% by weight of which have an equivalent spherical diameter (“esd”) of less than 2 μm and having a particle size distribution (“psd”) such that its d50 value, namely the particle esd value less than which 50% of the particles have an esd, is less than 1 μm; and Component B: a coarse pigment material having a psd such that its d50 value is from 2 μm to 10 μm, desirably 2 μm to 5 μm and such that not more than 2% by weight of the particles of the coarse pigment material have an esd greater than 15 μm, desirably not more than 2% have an esd greater than 10 μm; wherein the weight ratio of Component A to Component B is at least 4:1.

Dependencies are inferred from the claim text.