Ink jet recording method and ink jet recording apparatus

Patent metadata

Field	Value
Publication number	US-11607900-B2
Application number	US-202016916236-A
Country	US
Kind code	B2
Filing date	Jun 30, 2020
Priority date	Jul 1, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

The method is an ink jet recording method, which uses an ink set being composed of a plurality of aqueous inks and including a combination of a first ink containing a coloring material and a second ink containing no coloring material and by which an image is recorded by applying the first ink and the second ink onto a recording medium so that an area to which the first ink is applied and an area to which the second ink is applied overlap at least in part with each other. The coloring material of the first ink contains fluorescent dye, the second ink contains a first water-soluble organic solvent, and an SP value S S of the first water-soluble organic solvent and an SP value S D of the fluorescent dye satisfy a relationship of the following formula (1):

| S S −S D |≤4.0  (1).

First claim

What is claimed is:

1. An ink jet recording method, comprising:
using an ink set being composed of a plurality of aqueous inks and including a combination of a first ink containing a coloring material and a second ink containing no coloring material; and
recording an image by applying the first ink and the second ink onto a recording medium, so that an area to which the first ink is applied and an area to which the second ink is applied overlap at least in part with each other,
wherein the coloring material of the first ink comprises a fluorescent dye,
wherein the second ink comprises a first water-soluble organic solvent, and
wherein a SP value S S of the first water-soluble organic solvent and an SP value S D of the fluorescent dye satisfy a relationship of the following formula (1):
| S S −S D |≤4.0  (1).

2. The inkjet recording method according to claim 1 ,
wherein the first ink comprises a first resin particle dyed with the fluorescent dye, and
wherein an SP value S R of a resin forming the first resin particle and an SP value S S of the first water-soluble organic solvent satisfy a relationship of the following formula (2):
| S S −S R |≤3.5  (2).

3. The ink jet recording method according to claim 2 , wherein an SP value S R of a resin forming the first resin particle and an SP value S S of the first water-soluble organic solvent satisfy a relationship of the following formula (3):
| S S −S R |≤2.0  (3).

4. The inkjet recording method according to claim 2 , wherein the second ink further comprises a water-soluble resin.

5. The inkjet recording method according to claim 2 , wherein the second ink further comprises a second resin particle.

6. The ink jet recording method according to claim 4 , wherein a content (% by mass) of the water-soluble resin in the second ink, when expressed in mass ratio relative to a content (% by mass) of the first resin particle in the first ink, is 0.1 times or more.

7. The inkjet recording method according to claim 5 , wherein a cumulative 50% particle diameter in volume-based particle size of the second resin particle, when expressed in a ratio relative to a cumulative 50% particle diameter in volume-based particle size of the first resin particle, is 0.3 times or more to 2.0 times or less.

8. The inkjet recording method according to claim 2 , wherein a content (% by mass) of the first water-soluble organic solvent in the second ink, when expressed in mass ratio relative to a content (% by mass) of the first resin particle in the first ink, is 1.0 times or more.

9. The ink jet recording method according to claim 1 , comprising:
a first recording step of applying the first ink onto the recording medium; and
a second recording step of applying the second ink onto the recording medium so that an area to which the second ink is applied overlaps at least in part with an area to which the first ink is applied.

10. An ink jet recording apparatus used for the ink jet recording method according to claim 1 , comprising:
a recording head that uses an ink set composed of a plurality of aqueous inks and including a combination of a first ink containing a coloring material and a second ink containing no coloring material, and records an image by applying the first ink and the second ink onto a recording medium so that an area to which the first ink is applied and an area to which the second ink is applied overlap at least in part with each other,
wherein the coloring material of the first ink comprises a fluorescent dye,
wherein the second ink comprises a first water-soluble organic solvent, and
wherein an SP value S S of the first water-soluble organic solvent and an SP value S D of the fluorescent dye satisfy a relationship of the following formula (1):
| S S −S D |≤4.0  (1).

11. The ink jet recording method according to claim 1 , wherein the SP value S D of the fluorescent dye is 5.0 or more to 20.0 or less.

12. The ink jet recording method according to claim 1 , wherein the fluorescent dye is selected from the group consisting of C.I. Basic Red 1, C.I. Basic Red 1:1, C.I. Basic Violet 11, C.I. Basic Violet 11:1, C.I. Basic Yellow 40, C.I. Solvent Yellow 160:1, C.I. Solvent Yellow 196, C.I. Disperse yellow 82, and C.I. Fluorescent Brightener 351.

13. The ink jet recording method according to claim 2 , wherein the SP value S R of the resin forming the first resin particle is 5.0 or more to 20.0 or less.

14. The ink jet recording method according to claim 2 , wherein the first resin particle has a core portion and a shell portion which covers the core portion.

15. The ink jet recording method according to claim 14 , wherein a resin forming the core portion of the first resin particle comprises an aromatic group-containing unit and a cyano group-containing unit, and a resin forming the shell portion of the first resin particle comprises an aromatic group-containing unit, an anionic group-containing unit, and a crosslinking agent-derived unit.

16. The ink jet recording method according to claim 2 , wherein a percentage (% by mass) of the fluorescent dye in the first resin particle is 1.0% by mass or more to 15.0% by mass or less.

17. The ink jet recording method according to claim 1 , wherein the SP value S S of the first water-soluble organic solvent is 10.0 or more to 20.0 or less.

18. The ink jet recording method according to claim 5 , wherein the second resin particle has a core-shell structure.

19. The ink jet recording method according to claim 1 , wherein the content (% by mass) of the fluorescent dye in the first ink is 0.1% by mass or more to 5.0% by mass or less based on the total mass of the first ink.

20. The ink jet recording method according to claim 1 , wherein the content (% by mass) of the first water-soluble organic solvent in the second ink is 1.0% by mass or more to 25.0% by mass or less based on the total mass of the second ink.

21. The ink jet recording method according to claim 4 , wherein the content of the water-soluble resin in the second ink is 0.1% by mass or more to 5.0% by mass or less based on the total mass of the second ink.

22. The ink jet recording method according to claim 5 , wherein the content (% by mass) of the second resin particle in the second ink is 0.10% by mass or more to 5.0% by mass or less based on the total mass of the second ink.

23. The ink jet recording method according to claim 1 , wherein the first ink is applied onto the recording medium prior to the second ink.

Assignees

• Canon Kk

Inventors

• Wakao Saki
• Shimizu Yuhei

Classifications

• B41J2/01

  Ink jet · CPC title

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• B41J2/2114

  Ejecting specialized liquids, e.g. transparent or processing liquids (B41J2/211 takes precedence) · CPC title

• C09D11/328

  characterised by dyes · CPC title

• C09D11/54

  Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink · CPC title