Coating compositions for forming inkjet-receptive coatings on a substrate

1. A coating composition for forming an inkjet-receptive coating on a substrate comprising:

(a) p(diallyldimethyl ammonium chloride),

(b) a crosslinkable cationic polymer,

(c) colloidal silica,

(d) silica gel,

(e) a latex binder, and

(f) water.

2. A coating composition according to claim 1 , comprising, by weight,

(a) is 0.1-30%,

(b) is 1-50%,

(c) is 0.1-50%,

(d) is 0.1-55%,

(e) is 0.1-45%, and

(f) to 100%.

3. A coating composition according to claim 1 , comprising, by weight,

(a) is 1-25%,

(b) is 5-45%,

(c) is 1-20%,

(d) is 5-50%,

(e) is 5-35%, and

(f) to 100%.

4. A coating composition according to claim 1 , comprising, by weight,

(a) is 2-20%,

(b) is 10-35%,

(c) is 2-10%,

(d) is 10-45%,

(e) is 6-25%, and

(f) to 100%.

5. A coating composition according to claim 1 wherein (e) is a vinyl acetate-ethylene copolymer.

6. A coating composition according to claim 1 wherein (e) is a styrene-butadiene copolymer.

7. A coating composition according to claim 1 wherein (e) is an acrylic latex.

8. A coating composition according to claim 1 wherein (c) has a particle size of about 20-150 nm.

9. A coating composition according to claim 1 wherein (d) has a particle size of about 1.5 to 10μ.

10. A coating composition according to claim 1 wherein (b) is a terpolymer of quaternized vinyl caprolactam (VCL), dimethylaminopropyl methacrylamide (DMAPMA) and hydroxyl ethyl methacrylate (HEMA).

11. A coating composition according to claim 10 wherein, by weight, the terpolymer comprises 60-90% VCL, 10-30% DMAPMA and 2-10% HEMA.

12. A coating composition according to claim 1 wherein (b) is a copolymer of vinyl pyrrolidone (VP) and dimethylaminopropyl methacrylamide (DMAPMA).

13. A coating composition according to claim 1 which can include one or more of the following optional ingredients: crosslinked PVP; PVP, polyvinyl alcohols, a copolymer of vinyl pyrrolidone and dimethylaminopropyl methacrylamide neutralized with HCl, a crosslinker, titanium dioxide, barium sulfate, barium chloride, calcium carbonate, aluminum sulfate, aluminum chloride, polyethyloxazoline, Disintex® 1000, or a surfactant.

14. A coating composition according to claim 1 which forms a matte-finished inkjet coating on polyester, vinyl, paper or canvas.

15. A coating composition according to claim 1 having a solids content of about 15-30%.

16. A coating composition according to claim 1 having a viscosity of about 200-900 cps.

17. An inkjet-receptive coated substrate coated with the dried composition of claim 1 which forms color inkjet images which dry rapidly, has good color density, exhibits low color density loss, and is water-resistant.

18. An aqueous dispersion of the composition of claim 1 .