Coating composition for forming a glossy inkjet-receptive coating on a substrate
View Patent ↗A coating composition for forming a glossy, inkjet-receptive coating on a substrate includes (a) a cationic polymer, and (b) colloidal silica having an average particle size in the nanometer range.
1. A coating composition for making glossy inkjet-receptive coatings on a substrate comprising:
(a) a cationic polymer selected from the group consisting of vinyl lactam polymer, polyvinylpyrrolidone, copolymers thereof, and blends of such polymers,
(b) colloidal silica having an average particle size in the nanometer range,
(c) water,
(d) an additional binder selected from the group consisting of a latex, polyvinyl alcohol, cellulose, a cationic polyurethane dispersion and combinations thereof; and
(e) optionally, a crosslinker,
wherein (a) is 45 to 95% and (b) is 5 to 55% by dry weight based on the total dry weight of (a) and (b), wherein said coating composition provides glossy inkjet receptive coatings on a substrate having a gloss of about 90 or more at 60°.
2. A composition according to claim 1 wherein (b) has an average particle size of less than 100 nm.
3. A composition according to claim 2 wherein (b) has an average particle size of about 25 to 50 nm.
4. A composition according to claim 1 wherein said binder is a cationic polyurethane dispersion.
5. A composition according to claim 1 wherein, by weight, (a) is 70 to 95%, and (b) is 5 to 30% by dry weight based on the total dry weight of (a) and (b).
6. A composition according to claim 1 wherein said composition comprises the optional crosslinker and the crosslinker is selected from the group consisting of polyaziridine, glyoxal, polyepoxy, melamine/formaldehyde, ammonium zirconium carbonate, a borate, oxides of zinc, a carbodiimide and combinations thereof.
7. A substrate coated with the composition of claim 1 .
8. A coated substrate according to claim 7 wherein the substrate is paper, polyester, vinyl, or textile.