Ink jet recording method

Patent metadata

Field	Value
Publication number	US-10603928-B2
Application number	US-201716077298-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 12, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

The present invention relates to an ink-jet printing method that is capable of obtaining good printed materials that are free of occurrence of color migration and deformation of a printing medium even when printed on a resin printing medium. The present invention provides an ink-jet printing method using a water-based ink containing a black ink, a chromatic ink and a white ink which each contain a pigment (A), an organic solvent (C) having a boiling point of not lower than 90° C. and lower than 250° C., and water, said method including step 1 of ejecting at least one water-based ink selected from the group consisting of the black ink and the chromatic ink onto a transparent resin printing medium to print an image 1 on the printing medium; step 2 of ejecting the white ink onto the resulting image 1 to print a white image that covers the image 1 on the printing medium; and step 3 of heating and drying the resulting printed material from a side of a surface of the printing medium on which the white image is formed, using an infrared heater.

First claim

The invention claimed is:

1. An ink jet printing method using a water-based ink comprising
a black ink, a chromatic ink, and a white ink, wherein each of said inks comprises a pigment (A),
an organic solvent (C) having a boiling point of not lower than 90° C. and lower than 250° C. and
water,
wherein the black ink comprises 15 to 45% by mass of the organic solvent (C), the chromatic ink comprises 20 to 45% by the or organic solvent (C), and the white ink comprises 15 to 45% by mass of the organic solvent (C),
said method comprising the following steps 1 to 3:
Step 1: ejecting at least one water-based ink selected from the group consisting of the black ink and the chromatic ink onto a transparent resin printing medium to print an image 1 on the printing medium, wherein said printing medium has sufficient transparency to permit visualization of the printed image from a surface of the printing medium opposed to the surface thereof on which the images is printed, and wherein the surface temperature of said printing medium is controlled to the range of not lower than 35° C. and lower than 65° C.;
Step 2: ejecting the white ink onto the image 1 obtained in the step 1 to print a white image that covers the image 1 on the printing medium; and
Step 3: heating and drying the resulting printed material from a side of a surface of the printing medium on which the white image obtained in the step 2 is formed, using an infrared heater.

2. The ink-jet printing method according to claim 1 , wherein the printing medium is a polyester film that is subjected to corona discharge treatment, or a stretched polypropylene film.

3. The ink-jet printing method according to claim 1 , wherein the infrared heater is a short-wave infrared heater or a carbon infrared heater.

4. The ink-jet printing method according to claim 1 , wherein in the Step 2, the image 1 and the white image are printed on the printing medium whose surface temperature is controlled to the range of not lower than 35° C. and lower than 65° C.

5. The ink-jet printing method according to claim 1 , wherein a printing speed used in the method is not less than 3 m/min in terms of a transportation speed of the printing medium.

6. The ink-jet printing method according to claim 1 , wherein the black, chromatic, and white water-based inks comprise the organic solvent (C) in an amount of not less than 20% by mass and not more than 35% by mass.

7. The ink-jet printing method according to claim 1 , wherein a content of glycol ether in the black or chromatic water-based ink is not less than 1% by mass and not more than 15% by mass.

8. The ink-jet printing method according to claim 1 , wherein a content of glycol ether in the white water-based ink is not less than 1% by mass and not more than 15% by mass.

9. The ink-jet printing method according to claim 1 , wherein the water-based ink further comprises at least one polymer (B) selected from the group consisting of polyurethanes, polyesters, acrylic resins, styrene resins, styrene-acrylic resins, butadiene resins, styrene-butadiene resins, vinyl chloride resins, vinyl acetate resins and acrylic-silicone resins.

10. The ink-jet printing method according to claim 9 , wherein the polymer (B) has a weight-average molecular weight in the range 10,000 through 2,500,000.

11. The ink-jet printing method according to claim 9 , wherein the polymer (B) comprising a pigment dispersing polymer (B-1) and/or a fusing aid polymer (B-2).

Assignees

• Kao Corp
• Think Labs Kk

Inventors

• Matsumoto Yuta
• Mizushima Ryuma
• Sato Takahiro
• Watanabe Kazuki
• Ueda Yasufumi
• Shigeta Tatsuo

Classifications

• B41M5/0064

  on plastics, horn, rubber, or other organic polymers · CPC title

• B41M7/009

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

• B41M5/0047

  by ink-jet printing · CPC title

• B41J2/2117

  Ejecting white liquids · CPC title

• B41J11/002 Primary

  Curing or drying the ink on the copy materials, e.g. by heating or irradiating · CPC title