Aqueous inkjet ink comprising a bleed control agent
View Patent ↗The invention provides an ink for inkjet printing, comprising a self-dispersing pigment colorant and a bleed control agent selected from the group consisting of catechol, 4-methylcatechol and any combination thereof. The ink advantageously exhibits reduced intercolor bleed when printed, for example, on plain paper.
1. An inkjet ink comprising an aqueous vehicle, a self-dispersing pigment and a bleed control agent, wherein
said bleed control agent is selected from the group consisting of catechol, 4-methylcatechol and any combination thereof, and
said self-dispersing pigment comprises carboxylate dispersibility-imparting groups directly bonded to the surface of the pigment.
2. The inkjet ink of claim 1 , wherein the self-dispersing pigment comprises a self-dispersing carbon black pigment.
3. The inkjet ink of claim 2 , wherein said self-dispersing pigment has a degree of functionalization of less than about 3 μmol/m 2 .
4. The inkjet ink of claim 3 , wherein the amount of the bleed control agent present is greater than 2% by weight based on total weight of an ink.
5. The inkjet ink of claim 1 , wherein the bleed control agent is catechol.
6. The inkjet ink of claim 2 , wherein the bleed control agent is catechol.
7. The inkjet ink of claim 3 , wherein the bleed control agent is catechol.
8. The inkjet ink of claim 4 , wherein the bleed control agent is catechol.
9. The inkjet ink of claim 1 , wherein the bleed control agent is 4-methylcatechol.
10. The inkjet ink of claim 2 , wherein the bleed control agent is 4-methylcatechol.
11. The inkjet ink of claim 3 , wherein the bleed control agent is 4-methylcatechol.
12. The inkjet ink of claim 4 , wherein the bleed control agent is 4-methylcatechol.
13. An inkjet ink set comprising at least a magenta, yellow, cyan and black ink, wherein the black ink comprises an aqueous vehicle, a self-dispersing carbon black pigment and a bleed control agent, and wherein
said bleed control agent is selected from the group consisting of catechol, 4-methylcatechol and any combination thereof, and
said self-dispersing carbon black pigment comprises carboxylate dispersibility-imparting groups directly bonded to the surface of the pigment.
14. The inkjet ink set of claim 13 , wherein said magenta, said yellow and said cyan inks are dyes.