Patent ID: 8062415

Claim:
A composition for controlling the bleed fastness of organic colouring pigments in paper coatings comprising; a) 1 to 30% by weight, based on the total weight of the composition, of an organic colouring pigment, b) 1 to 20% by weight, based on the total weight of the composition, of one or more binders, c) 0 to 20% by weight, based on the total weight of the composition, of starch, d) 1.9 to 10% by weight, based on the total weight of the composition, of an anionic direct dye, e) 0 to 10% by weight, based on the total weight of the composition one or more auxiliaries and f) water to 100%, wherein the organic colouring pigment is selected from the group consisting of: a nitroso compound, a nitro compound, a monoazo pigment, a disazo pigment, a stilbene, a diphenylmethane, a triarylmethane, a xanthene, an acridine, a quinoline, a methine, a thiazole, an indamine, an indophenol, an azine, an oxazine, a thaizine, an aminoketone, an anthraquinone, and an indigoid, the pigments being described in the Colour Index International (The Society of Dyers and Colourists, 1997) and where component b) comprises a stable aqueous dispersion of a water insoluble component and a water soluble component, whereby the water insoluble component comprises coalescable polymer particles which have a T g less than 55° C. and at least 50% of which have a particle size less than 1 micron and the water soluble component comprises a water soluble polymer capable of inhibiting coalescence of said polymer particles, or a water soluble polymer and a component capable of inhibiting coalescence of said polymer particles, wherein said water insoluble component comprises greater than 3% and less than 75% by weight of binder solids and said water soluble component comprises greater than 25% and less than 97% of binder solids.