Granted Patent B2

US 7,439,295 · App. 11/057,649 · Granted Oct 21, 2008

Abstract

Claims (12)

1. A synergistic inkjet-receptive coating composition which is a microporous composition for inkjet printing on a substrate with advantageous ink dry times comprising:

(a) swellable, water-insoluble polyvinylpolypyrrolidone (PVPP) particles and

(b) fumed or gel silica particles, wherein the weight ratio of (a) to (b) is 10-90:90-10.

2. A synergistic composition according to claim 1 wherein the weight ratio of, (a):(b) is 25-75:75:25.

3. A synergistic composition according to claim 1 wherein said weight ratio of (a):(b) is about 50:50.

4. A synergistic composition according to claim 1 wherein the average particle size of said fumed silica is 0.05-0.12 μm.

5. A synergistic composition according to claim 3 wherein the average particle size of said gel silica is 3-16 μm.

6. A synergistic composition according to claim 1 which includes a binder.

7. A synergistic composition according to claim 6 wherein said binder is selected from polyvinyl alcohol, starch, gelatin, PVP or PVP copolymers, or a latex.

8. A synergistic composition according to claim 1 which includes water.

9. A synergistic composition according to claim 8 which is an aqueous dispersion having a solids content of about 18%.

10. A synergistic composition according to claim 1 wherein said substrate is paper, plastic or fabric.

Assignments (6)