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

Abstract

The present invention is an ink set for ink-jet recording including at least one first liquid A for forming at least an image and at least one second liquid B different in composition from the above first liquid A, wherein at least the liquid A contains a polymerizing or crosslinking material, and wherein any one liquid of at least the liquids A and B contains a triarylsulfonium salt polymerization initiator having one or more of aryl backbones having an electron-accepting group as a substituent.

Description

Claims

1. An ink set for ink-jet recording, comprising: at least one first liquid A for forming at least an image and at least one second liquid B different in composition from the first liquid A, whereinat least the liquid A contains a polymerizing or crosslinking material, andat least one of the liquids A and B contains a triarylsulfonium salt polymerization initiator having one or more aryl backbones having an electron-accepting group as a substituent.

2. The ink set for ink-jet recording of claim 1, wherein the triarylsulfonium salt polymerization initiator having one or more aryl backbones having the electron-accepting group as a substituent has a triarylsulfonium salt structure, and is a polymerization initiator in which the sum total of Hammett constants of the substituents bonding to the aryl backbone is larger than 0.46.

3. The ink set for ink-jet recording of claim 1, wherein the second liquid B contains a surfactant.

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

5. The ink set for ink-jet recording of claim 4, wherein the lipophilic solvent is a high boiling point organic solvent having a boiling point of more than 100° C.

6. The ink set for ink-jet recording of claim 1, wherein the first liquid A further contains a colorant.

7. The ink set for ink-jet recording of claim 1, wherein the second liquid B does not contain a colorant, or contains a colorant such that the content of the colorant is less than 1 mass %.

8. The ink set for ink-jet recording of claim 1, wherein the content of the triarylsulfonium salt polymerization initiator is in a range of from 0.5 to 30 mass % based on the total solid component of the ink composition.

9. The ink set for ink-jet recording of claim 1, wherein the sp value of the second liquid B, which is imparted in advance prior to impartment of the first liquid A, is 35 or less, and wherein the difference in the sp value between the first liquid A and second liquid B is 10 or less.

10. An ink-jet recording method, comprising: providing the ink set of claim 1, and imparting in advance the second liquid B to an identical region as, or a region wider than, a region of an image to be formed with the first liquid A.

11. The ink-jet recording method of claim 10, comprising: drop jetting at least a first liquid droplet a1 and a liquid droplet a2 of the first liquid A, such that the first liquid droplet a1 and the liquid droplet a2 have an overlapping portion, to record a desired image.

12. The ink-jet recording method of claim 11, wherein the overlap ratio of the overlapping portion is 10% or more and 90% or less.

13. The ink-jet recording method of claim 10, wherein after impartment of the second liquid B, the interval of drop jetting until the first liquid A is drop jetted is from 5 μsec to 400 msec.

14. The ink-jet recording method of claim 10, wherein the liquid droplet size of the drop-jetted liquid A is from 0.1 picoliter to 100 picoliters.

15. The ink-jet recording method of claim 10, wherein The second liquid B is kept in liquid form until the first liquid A is drop jetted.

16. The ink-jet recording method of claim 10, wherein after drop jetting of the first liquid A, active energy is imparted to the image to polymerize the polymerizing material or crosslink the crosslinking material.