Ink set and image recording method

• US 10,639,905 B2
• Filed: 09/12/2018
• Issued: 05/05/2020
• Est. Priority Date: 03/24/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Shimono, Katsuhiro, Arai, Takuya
• Primary Examiner(s): Shah, Manish S
• Application Number:
  US16/128,508
• Publication Number:
  US 20190010349A1
• Time in Patent Office: 601 Days
• CPC Class Codes: B41J 2/2107 characterised by the ink properties supplying ink in a solid state B41J2/17593
• CPC Class Codes: B41J 2/2114 Ejecting transparent or white coloured liquids, e.g. processing liquids B41J2/211 takes precedence
• CPC Class Codes: B41M 5/0017 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 Class Codes: B41M 7/0018 using ink-fixing material, e.g. mordant, precipitating agent, after printing, e.g. by ink-jet printing, coating or spraying
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/585 and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
• CPC Class Codes: C09D 11/106 containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 11/107 from unsaturated acids or derivatives thereof
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/326 characterised by the pigment dispersant
• 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

Provided are an ink set including: an ink composition which contains a colorant and water, and a treatment liquid which contains water-insoluble resin particles having a constitutional unit derived from a first monomer that contains at least one group selected from a sulfo group and a salt of the sulfo group and a constitutional unit derived from a second monomer that has at least one structure selected from an aromatic ring structure and an alicyclic structure, a compound that causes the colorant in the ink composition to aggregate, and water; and an image recording method.

Claims

1. An ink set comprising:

an ink composition which contains a colorant and water; and

a treatment liquid which contains water-insoluble resin particles having a constitutional unit derived from a first monomer that contains at least one group selected from a sulfo group and a salt of the sulfo group and a constitutional unit derived from a second monomer that contains at least one structure selected from an aromatic ring structure and an alicyclic structure, a compound that causes the colorant in the ink composition to aggregate, and water,

wherein the water-insoluble resin particles are dispersed in the treatment liquid,

wherein the constitutional unit derived from the first monomer is a constitutional unit represented by Formula 1,

2. The ink set according to claim 1,

wherein the constitutional unit derived from the second monomer is at least one constitutional unit selected from the group of constitutional units represented by any of Formulae A to E,

3. The ink set according to claim 1,

wherein a content ratio of the total constitutional units derived from the second monomer in the water-insoluble resin to a total mass of the water-insoluble resin is in a range of 10% by mass to 40% by mass.

4. The ink set according to claim 1,

wherein a mass ratio of the constitutional unit derived from the first monomer to the constitutional unit derived from the second monomer is in a range of 0.15 to 0.90.

5. The ink set according to claim 1,

wherein a content ratio of the constitutional unit derived from the first monomer in the water-insoluble resin to a total mass of the water-insoluble resin is in a range of 5% by mass to 25% by mass.

6. The ink set according to claim 1,

wherein a mass ratio of oxygen atoms in at least one second monomer to a molecular weight of the second monomer is 0.1 or less.

7. The ink set according to claim 1,

wherein at least one second monomer is styrene.

8. The ink set according to claim 1,

wherein a glass transition temperature of the water-insoluble resin is 100°

C. or higher.

9. The ink set according to claim 1,

wherein a content ratio of the water-insoluble resin particles to the compound that causes the colorant to aggregate is in a range of 0.19 to 0.5 in terms of the mass.

10. An image recording method comprising:

a pre-treatment step of applying the treatment liquid of the ink set according to claim 1 to at least one surface of a substrate having a contact angle of 70°

or greater when 3 seconds have elapsed from application of water droplets to the surface; and

an image recording step of recording an image by jetting the ink composition of the ink set according to claim 1 to the surface to which the treatment liquid has been applied using an ink jet method.

11. The image recording method according to claim 10,

wherein the substrate is a paper substrate having a coating layer.