Ink set and image formation method

Patent metadata

Field	Value
Publication number	US-12049568-B2
Application number	US-202117239698-A
Country	US
Kind code	B2
Filing date	Apr 26, 2021
Priority date	Nov 2, 2018
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

An ink set including a color ink containing particles including a polymerizable compound, a colorant, and water and an overcoat solution containing particles including a polymerizable compound and water, and an image formation method.

First claim

What is claimed is:

1. An ink set comprising:
a color ink containing particles including a polymerizable compound, a colorant, and water, and
an overcoat solution containing particles including a polymerizable compound and water,
wherein a water content of the color ink relative to a total amount of the color ink is from 30 mass % to 98 mass %,
wherein the color ink further contains a polymerization initiator and the overcoat solution further contains a polymerization initiator, and
wherein at least one of the polymerization initiator in the color ink or the polymerization initiator in the overcoat solution includes a compound represented by Formula (X) below:

in Formula (X), R 1 and R 2 each independently represent an alkyl group; R 3 , R 4 , R 5 , and R 6 each independently represent a hydrogen atom or a substituent; R 7 represents a hydrogen atom, an alkyl group, an acyl group, or a trialkylsilyl group; Z represents a hydroxy group, an alkoxy group, or an alkylamino group; Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom; and n represents an integer of 1 to 3.

2. The ink set according to claim 1 , wherein the particles in the color ink include a polymerizable polymer.

3. The ink set according to claim 2 , wherein the polymerizable polymer in the color ink includes polymerizable polyurethane.

4. The ink set according to claim 2 , wherein the polymerizable polymer in the color ink has a weight-average molecular weight of 1000 to 30000.

5. The ink set according to claim 1 , wherein the particles in the overcoat solution include a polymerizable polymer.

6. The ink set according to claim 5 , wherein the polymerizable polymer in the overcoat solution includes polymerizable polyurethane.

7. The ink set according to claim 5 , wherein the polymerizable polymer in the overcoat solution has a weight-average molecular weight of 1000 to 30000.

8. The ink set according to claim 1 , being used for image formation on leather.

9. The ink set according to claim 1 , wherein the overcoat solution has a surface tension lower than a surface tension of the color ink.

10. The ink set according to claim 1 , wherein C OP representing a percent by mass of the polymerizable compound in the overcoat solution is larger than C IP representing a percent by mass of the polymerizable compound in the color ink.

11. The ink set according to claim 1 , further comprising an aggregating solution containing water and an aggregating agent for aggregating a component in the color ink.

12. An image formation method using the ink set according to claim 1 , the method comprising:
applying, onto a substrate, the color ink to form a color image; and
applying, onto at least the color image on the substrate, the overcoat solution to form an overcoat layer.

13. The image formation method according to claim 12 , wherein forming the color image includes applying, onto the substrate, the color ink, drying and subsequently curing the applied color ink to form the color image, and
forming the overcoat layer includes applying, onto at least the color image on the substrate, the overcoat solution, drying and subsequently curing the applied overcoat solution to form the overcoat layer.

14. An image formation method using the ink set according to claim 11 , the method comprising:
applying, onto a substrate, the aggregating solution;
applying, onto a surface of the applied aggregating solution on the substrate, the color ink to form a color image; and
applying, onto at least the color image on the substrate, the overcoat solution to form an overcoat layer.

15. The image formation method according to claim 14 , wherein forming the color image includes applying, onto the surface of the applied aggregating solution on the substrate, the color ink, drying and subsequently curing the applied color ink, to form the color image, and
forming the overcoat layer includes applying, onto at least the color image on the substrate, the overcoat solution, drying and subsequently curing the applied overcoat solution, to form the overcoat layer.

16. The image formation method according to claim 12 , wherein, in forming the overcoat layer, a solid-content application amount of the overcoat solution is 1 g/m 2 or more.

Assignees

• Fujifilm Corp

Inventors

• Makuta Toshiyuki

Classifications

• C09D11/322

  Pigment inks · CPC title

• B41J2/21

  for multi-colour printing · CPC title

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title

• B41J2/2107

  characterised by the ink properties (supplying ink in a solid state B41J2/17593) · CPC title