Ink jet recording method and ink set

Patent metadata

Field	Value
Publication number	US-11648790-B2
Application number	US-202017084742-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Oct 31, 2019
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

An ink jet recording method performs recording on a recording medium using a white ink composition, a non-white ink composition, and a treatment liquid containing an aggregating agent, the method including: a treatment liquid adhesion step of adhering the treatment liquid to the recording medium to form a treatment liquid layer; a non-white ink adhesion step of adhering the non-white ink composition to the recording medium by ejection thereof from an ink jet head to form a non-white ink layer; and a white ink adhesion step of adhering the white ink composition to the recording medium by ejection thereof from an ink jet head to form a white ink layer. The recording medium has a region in which the non-white ink layer, the white ink layer, and the treatment liquid layer are overlapped with each other, at least one of the ink compositions contains resin particles and a water-soluble resin, and the water-soluble resin has a glass transition temperature higher than that of a resin of the resin particles.

First claim

What is claimed is:

1. An ink jet recording method which performs recording on a recording medium using a white ink composition, a non-white ink composition, and a treatment liquid containing an aggregating agent, the method comprising:
a treatment liquid adhesion step of adhering the treatment liquid to the recording medium to form a treatment liquid layer;
a non-white ink adhesion step of adhering the non-white ink composition to the recording medium by ejection thereof from an ink jet head to form a non-white ink layer; and
a white ink adhesion step of adhering the white ink composition to the recording medium by ejection thereof from an ink jet head to form a white ink layer,
wherein the recording medium has a region in which the non-white ink layer, the white ink layer, and the treatment liquid layer are overlapped,
at least one of the white ink composition and the non-white ink composition contains resin particles and a water-soluble resin, or one of the white ink combination and the non-white ink composition contains resin particles, and the other contains a water-soluble resin,
the water-soluble resin has a glass transition temperature higher than that of a resin of the resin particles,
the glass transition temperature of the water-soluble resin is in the range of 90 to 200° C., and
the water-soluble resin is dissolved in a medium of the ink composition.

2. The ink jet recording method according to claim 1 , wherein the white ink composition contains the resin particles and the water-soluble resin.

3. The ink jet recording method according to claim 1 , wherein at least one of the white ink composition and the non-white ink composition contains the resin particles and the water-soluble resin, and a content of the resin particles in the ink composition is two times or more that of the water-soluble resin.

4. The ink jet recording method according to claim 1 , wherein the water-soluble resin has a glass transition temperature higher than that of the resin of the resin particles by 10° C. to 100° C.

5. The ink jet recording method according to claim 1 , wherein the water-soluble resin has a glass transition temperature of 90° C. or more, and the resin of the resin particles has a glass transition temperature of less than 90° C.

6. The ink jet recording method according to claim 1 , wherein the resin of the resin particles includes an acrylic resin, and the water-soluble resin includes a urethane resin.

7. The ink jet recording method according to claim 1 , wherein the non-white ink composition includes a clear ink composition, and
the non-white ink adhesion step adheres the clear ink composition to the recording medium by ejection thereof from an ink jet head to form a clear ink layer.

8. The ink jet recording method according to claim 1 , wherein the aggregating agent contained in the treatment liquid contains a polyvalent metal salt, an organic acid, or a cationic polymer.

9. The ink jet recording method according to claim 1 , wherein in the non-white ink adhesion step or the white ink adhesion step, the recording medium has a surface temperature of 45° C. or less when the ink composition is adhered thereto.

10. The ink jet recording method according to claim 1 , further comprising a post-heating step of, after the treatment liquid adhesion step, the non-white ink adhesion step, and the white ink adhesion step, heating the recording medium,
wherein the recording medium has a surface temperature of 90° C. or less in the post-heating step.

11. The ink jet recording method according to claim 1 , wherein the non-white ink composition includes a non-white color ink composition, and
the non-white ink adhesion step adheres the non-white color ink composition to the recording medium by ejection thereof from an ink jet head to form a non-white color ink layer as the non-white ink layer.

12. The ink jet recording method according to claim 1 , wherein the white ink adhesion step forms the white ink layer on the non-white ink layer formed by the non-white ink adhesion step.

13. An ink set which includes a white ink composition, a non-white ink composition, and a treatment liquid containing an aggregating agent and which is used for a recording method to be performed on a recording medium,
the recording method comprising:
a treatment liquid adhesion step of adhering the treatment liquid to the recording medium to form a treatment liquid layer;
a non-white ink adhesion step of adhering the non-white ink composition to the recording medium by ejection thereof from an ink jet head to form a non-white ink layer; and
a white ink adhesion step of adhering the white ink composition to the recording medium by ejection thereof from an ink jet head to form a white ink layer,
wherein the recording medium has a region in which the non-white ink layer, the white ink layer, and the treatment liquid layer are overlapped,
at least one of the white ink composition and the non-white ink composition contains resin particles and a water-soluble resin, or one of the white ink combination and the non-white ink composition contains resin particles, and the other contains a water-soluble resin,
the water-soluble resin has a glass transition temperature higher than that of a resin of the resin particles,
the glass transition temperature of the water-soluble resin is in the range of 90 to 200° C., and
the water-soluble resin is dissolved in a medium of the ink composition.

Assignees

• Seiko Epson Corp

Inventors

• Fujita Kunihiro
• Okuda Ippei

Classifications

• C09D11/322

  Pigment inks · CPC title

• B41M5/0017

  Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• C09D11/101

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• B41M7/009

  using thermal means, e.g. infrared radiation, heat · CPC title