Paper coating compositions
The invention relates to a composition for controlling the bleed fastness of organic coloring pigments in paper coatings comprising a) 1 to 30% by weight, based on the total weight of the composition, of an organic coloring 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) 0 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%, a method of application and use of the composition.
1. 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.
2. The composition according to claim 1 , wherein the anionic direct dye is selected from the group consisting of: a bis-azo, a tris-azo, a polyazo, a monoazo, a stilbene, an oxazine, a thiazole, and a phthalocyanine dye.
3. The composition according to claim 1 , comprising the auxiliary, wherein the auxiliary is selected from the group consisting of: a fixing agent, an additional binder resin, an insolubilizing agent, a crosslinking agent, an anionic polymer, a cationic polymer, a neutral polymer, a wet-strength agent, an antifoam, and a biocide.
4. A method of controlling the bleed fastness of organic colouring pigments in paper coating compositions, by applying to the paper a composition as defined in claim 1 .
5. Paper, which has been treated with the composition as defined in claim 1 .
6. 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) 0 to 10% by weight, based on the total weight of the composition one or more auxiliaries
e) 1.9 to 10% by weight, based on the total weight of the composition, of an anionic direct dye, 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 the binders comprise a water insoluble synthetic latex polymer derived from one or more dienes and/or unsaturated monomers.
7. The composition according to claim 6 , wherein the anionic direct dye is selected from the group consisting of: a bis-azo, a tris-azo, a polyazo, a monoazo, a stilbene, an oxazine, a thiazole, and a phthalocyanine dye.
8. The composition according to claim 6 , comprising the auxiliary, wherein the auxiliary selected from the group consisting of: a fixing agent, an additional binder resin, an insolubilizing agent, a crosslinking agent, an anionic polymer, a cationic polymer, a neutral polymer, a wet-strength agent, an antifoam, and a biocide.
9. A method of controlling the bleed fastness of organic colouring pigments in paper coating compositions, by applying to the paper a composition as defined in claim 6 .
10. Paper, which has been treated with the composition as defined in claim 6 .
11. 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) 0 to 10% by weight, based on the total weight of the composition one or more auxiliaries,
e) 1.9 to 10% by weight, based on the total weight of the composition, of an anionic direct dye, 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.
12. The composition according to claim 11 , wherein the anionic direct dye is selected from the group consisting of: a bis-azo, a tris-azo, a polyazo, a monoazo, a stilbene, an oxazine, a thiazole, and a phthalocyanine dye.
13. The composition according to claim 11 , comprising the auxiliary, wherein the auxiliary is selected from the group consisting of: a fixing agent, an additional binder resin, an insolubilizing agent, a crosslinking agent, an anionic polymer, a cationic polymer, a neutral polymer, a wet-strength agent, an antifoam, and a biocide.
14. A method of controlling the bleed fastness of organic colouring pigments in paper coating compositions, by applying to the paper a composition as defined in claim 11 .
15. Paper, which has been treated with the composition as defined in claim 11 .