Fast dry coated inkjet paper
Disclosed are a coating composition, coated article, and a method for treating one or more sides of the printable web with the composition, for providing improved printing ink dry time and gloss. The coating composition comprises: a calcium carbonate pigment component comprising a mixture high and low surface area calcium carbonate pigment; a metal salt drying agent; and a cationic dye fixing agent; a pigment binder; optionally a plastic pigment; and optionally an optical brightener; and which provides: a solids content of at least about 25%; a ratio of high to low surface area calcium carbonate in the range of from about 0.5:1 to about 20:1; and a ratio of calcium carbonate pigment component to pigment binder in the range of from about 4:1 to about 50:1.
1. An article comprising:
a printable web having first and second surfaces; and
a coating on at least one of the first and second surfaces,
wherein the coating comprises:
a calcium carbonate pigment component comprising a mixture high and
low surface area calcium carbonate pigment;
a metal salt drying agent;
a cationic dye fixing agent; and
a pigment binder;
wherein the coating has:
a ratio of high surface area calcium carbonate to low surface area calcium carbonate in the range of from about 0.5:1 to about 20:1; and
a ratio of calcium carbonate pigment component to pigment binder in the range of from about 4:1 to about 50:1;
wherein the coating provides:
a printable web surface loading on each surface on which the coating is present in an amount of at least about 3 gsm.
2. The article of claim 1 , wherein the calcium carbonate pigment component is in an amount from about 70 to about 95% by weight of the composition.
3. The article of claim 2 , wherein the ratio of high surface area calcium carbonate to low surface area calcium carbonate is in the range of from about 1:1 to about 19:1.
4. The article of claim 1 , wherein the metal salt drying agent is in an amount from about 1 to about 10% by weight of the composition.
5. The article of claim 4 , wherein the metal salt drying agent is sodium chloride, calcium chloride, calcium nitrate, magnesium chloride, magnesium nitrate, aluminum chloride, sodium sulfate, aluminum chloride, aluminum nitrate, aluminum sulfate, potassium chloride, sodium aluminum sulfate, vanadium chloride, magnesium sulfate, sodium silicates, or a combination thereof.
6. The article of claim 5 , wherein the metal salt drying agent is calcium chloride.
7. The article of claim 1 , wherein the cationic dye fixing agent is in an amount from about 1 to about 10% by weight of the composition.
8. The article of claim 7 , wherein the cationic dye fixing agent is a polyamine, a polyethyleneimine, a polymer or copolymer of diallyldimethyl ammonium chloride, a copolymer of vinyl pyrrolidone with a quaternized diethylaminoethylmethacrylate, a polyamide, a cationic polyurethane latex, a cationic polyvinyl alcohol, a polyalkylamine dicyandiamid copolymer, an amine glycidyl addition polymer, a poly[oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene] dichloride, or a combinations thereof.
9. The article of claim 1 , wherein the pigment binder is in an amount from about 1 to about 10% by weight of the composition.
10. The article of claim 9 , wherein the pigment binder is a polyvinyl alcohol, a starch binder, a proteinaceous, a polymer latex, or a combination thereof.
11. The article of claim 1 , which further comprises a plastic pigment.
12. The article of claim 1 , which has a solids content of from about 25 to about 75% by weight.
13. The article on of claim 1 , wherein the ratio of calcium carbonate pigment component to pigment binder in the range of from about 10:1 to about 33.3:1.
14. The article of claim 1 , which has a viscosity of from about 30 to about 800 cps.
15. The article of claim 1 , wherein the coating is present in an amount of from about 7 gsm to about 20 gsm.
16. The article of claim 1 , wherein the coating is on one of the first and second surfaces.
17. The article of claim 1 , wherein the coating is on both of the first and second surfaces.
18. A method of making the article according to claim 1 , comprising the following steps:
(a) providing a printable web having first and second surfaces; and
(b) providing a liquid coating composition comprising:
a calcium carbonate pigment component comprising a mixture high and low surface area calcium carbonate pigment;
a metal salt drying agent;
a cationic dye fixing agent; and
pigment binder;
wherein the coating composition has:
a ratio of high surface area calcium carbonate to low surface area calcium carbonate in the range of from about 0.5:1 to about 20:1; and
a ratio of calcium carbonate pigment component to pigment binder in the range of from about 4:1 to about 50:1;
wherein the coating composition:
has a solids content of at least about 25% by weight; and
(c) treating at least one of the first and second surfaces of the printable web of step (a) with the coating composition of step (b), wherein the printable web surface loading on each surface on which the coating is present is in an amount at least about 6 gsm.
19. The method of claim 18 , wherein the printable web is treated in step (c) with the composition of step (b) on one of the first and second surfaces.
20. The method of claim 18 , wherein the printable web is treated in step (c) with the composition of step (b) on both the first and second surfaces.