Ink-jet recording ink set and ink-jet recording method

Abstract

The invention provides an ink-jet recording ink set including at least one first liquid A for at least forming an image and at least one second liquid B having a different composition from the composition of the first liquid A, wherein the first liquid A contains at least a polymer having a heterocyclic residue for forming a colorant, and a pigment, as well as an ink-jet recording method using the ink set.

Description

Claims

1. An ink-jet recording ink set comprising at least one first liquid A for at least forming an image and at least one second liquid B having a different composition from the composition of the first liquid A, wherein the first liquid A contains at least a polymer having a heterocyclic residue for forming a colorant, and a pigment.

2. The ink-jet recording ink set of claim 1, wherein the polymer contains a repeating unit represented by formula (1):

3. The ink-jet recording ink set of claim 2, wherein P in formula (1) is a group derived from at least one selected from the group consisting of quinacridone, benzimidazolone, indole, quinoline, carbazole, acridine, acridone and anthraquinone.

4. The ink-jet recording ink set of claim 1, wherein the polymer is a graft copolymer further containing, as a copolymerization unit, a repeating unit derived from a polymerizable oligomer (macro-monomer) having an ethylenic unsaturated double bond at a terminal thereof.

5. The ink-jet recording ink set of claim 1, wherein the first liquid A contains at least a polymerizable compound or crosslinkable compound.

6. The ink-jet recording ink set of claim 5, wherein the second liquid B contains a polymerization initiator for permitting at least the polymerizable compound or crosslinkable compound to undergo a polymerizing or crosslinking reaction.

7. The ink-jet recording ink set of claim 1, wherein the second liquid B further contains a lipophilic solvent, and the content of the lipophilic solvent is 50% by mass or more of the total mass of the second liquid B.

8. The ink-jet recording ink set of claim 7, wherein the lipophilic solvent is a high boiling point organic solvent having a boiling point higher than 100° C.

9. The ink-jet recording ink set of claim 1, wherein the second liquid B contains no colorant, or the content of the colorant is less than 1%.

10. An ink-jet recording method using an ink-jet recording ink set comprising at least one first liquid A for at least forming an image and at least one second liquid B having a different composition from the composition of the first liquid A, wherein the first liquid A contains at least a polymer having a heterocyclic residue for forming a colorant, and a pigment, the method comprising applying the second liquid B on an area corresponding to the image to be formed on a recording medium with the first liquid A or an area wider than the area corresponding to the image, before application of the first liquid A.

11. The ink-jet recording method of claim 10, wherein at least a droplet a1 and a droplet a2 of the first liquid A are applied to form the image, wherein the droplet a1 and the droplet a2 have overlap portion with respect to each other.

12. The ink-jet recording method of claim 11, wherein the overlap ratio at the overlap portion is in the range of 10% to 90%.

13. The ink-jet recording method of claim 10, wherein a time interval between finishing of the application of the second liquid B and starting of the application of a droplet al of the first liquid A is in the range of 5 μsec to 400 msec.

14. The ink-jet recording method of claim 10, wherein the size of droplets of the first liquid A including a droplet a1 and a droplet a2 is in the range of 0.1 picoliters to 100 picoliters.

15. The ink-jet recording method of claim 10, wherein the second liquid B is maintained in a liquid state until application of the first liquid A.

16. The ink-jet recording method of claim 10, wherein at least one of the first liquid A and the second liquid B contains a polymerizable compound or crosslinkable compound, and the polymerizable compound or crosslinkable compound is polymerized or crosslinked by applying activation energy to the image after applying droplets of the first liquid A.