Ink set and recording method using the same

• US 10,988,628 B2
• Filed: 12/30/2019
• Issued: 04/27/2021
• Est. Priority Date: 08/21/2013
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Okuda, Ippei, Aoyama, Tetsuya
• Primary Examiner(s): Lin, Erica S
• Application Number:
  US16/729,942
• Publication Number:
  US 20200131391A1
• Time in Patent Office: 484 Days
• Field of Search: None
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing
• CPC Class Codes: C09D 11/54 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

Abstract

An ink set includes a reaction liquid containing coagulant; a first ink containing a color material; and a second ink containing a color material. The ink set is used for recording on a non-absorptive recording medium or a low-absorptive recording medium and for imparting the reaction liquid, the first ink, and the second ink to the recording medium in a superimposed manner in this order.

Claims

1. A recording method, comprising:

providing an ink set including a reaction liquid containing coagulant, a first ink containing a first color material, and a second ink containing a second color material;

imparting the reaction liquid of the ink set to a non-absorptive recording medium or a low-absorptive recording medium;

imparting the first ink of the ink set to the area to which the reaction liquid is imparted; and

imparting the second ink of the ink set to the area to which the first ink is imparted,

wherein, before the imparting of the second ink, the reaction liquid and the first ink that are each imparted to the recording medium are heated,

a surface tension of the reaction liquid is less than or equal to 35 mN/m at a temperature of 25°

C.,

a surface temperature of the recording medium is lower than or equal to 50°

C. in the heating of the reaction liquid and the first ink that are each imparted to the recording medium before the imparting of the second ink, and

one of the first ink and the second ink is a white ink containing a white color material as the first color material or a metallic ink containing a metallic color material as the first color material, and the other of the first ink and the second ink is a yellow ink, a magenta ink, or a cyan ink containing the second color material or a black ink containing a black color material as the second color material.

2. The recording method according to claim 1, wherein the coagulant contains at least one selected from a group consisting of a polyvalent metal salt and an organic acid.

3. The recording method according to claim 1, wherein a surface tension of the reaction liquid is greater than or equal to 1 and less than or equal to 35 mN/m at a temperature of 25°

C.

4. The recording method according to claim 1, wherein the reaction liquid further contains at least one selected from a group consisting of a component which becomes a receiving layer of an ink applied after the reaction liquid, and a cationic resin.

5. The recording method according to claim 4, wherein a mass ratio of at least one (unit:

g) selected from the group consisting of the component which becomes the receiving layer, and the cationic resin, which are contained in the reaction liquid, to the first color material (unit;

g) contained in the first ink is 7;

1 to 70;

1 (the first color material;

at least one selected from the group).

6. The recording method according to claim 1, wherein a content of the first color material in the first ink with respect to a total mass of ink is 10 to 15 mass %;

and

a content of the second color material in the second ink with respect to the total mass of the ink is 2 to 4 mass %.

7. The recording method according to claim 1, wherein the first ink and the second ink each contain a resin emulsion.

8. The recording method according to claim 7, wherein the resin emulsion contains at least one of a urethane resin, a (meth)acrylic-based resin, and a styrene-(meth)acrylic-acid copolymer-based resin.

9. The recording method according to claim 1, wherein at least a portion of the reaction liquid and the first ink which are imparted to the recording medium are dried by the heating.

10. The recording method according to claim 1, wherein the surface temperature of the recording medium is less than or equal to 45 degrees C. when the reaction liquid and the first ink that are each imparted to the recording medium are heated before the imparting of the second ink.

11. The recording method according to claim 1, wherein 10 mg/inch² or less of the reaction liquid is imparted to the recording medium.

12. The recording method according to claim 1, wherein 5 to 20 mg/inch² of the first ink is imparted to the recording medium, and 5 to 20 mg/inch² of the second ink is imparted to the recording medium.

13. The recording method according to claim 1, wherein a total amount of the first and second color materials contained in the first ink and the second ink imparted to the recording medium is 0.5 to 3 mg/inch².

14. The recording method according to claim 1, wherein the first ink, the second ink, and the reaction liquid are each water-based.

15. The recording method according to claim 1, wherein the reaction liquid contains a surfactant.

16. The recording method according to claim 1, wherein the reaction liquid contains a surfactant, and a content of the surfactant is 0.6 mass % or more with respect to a total mass of the reaction liquid.

17. The recording method according to claim 1, wherein a content of a resin of a resin emulsion contained in the first ink is 3 mass % or more with respect to a total mass of the first ink.

18. The recording method according to claim 1, wherein a content of a resin of a resin emulsion contained in the second ink is 3 mass % or more with respect to a total mass of the second ink.

19. A recording apparatus that performs recording by the recording method according to claim 1.