Ink set and image forming method

• US 9,951,239 B2
• Filed: 01/22/2016
• Issued: 04/24/2018
• Est. Priority Date: 01/29/2015
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Arai, Takuya, Shimono, Katsuhiro
• Primary Examiner(s): NGUYEN, VU ANH
• Application Number:
  US15/003,801
• Publication Number:
  US 20160222238A1
• Time in Patent Office: 823 Days
• 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 7/00 After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock pre-treatment or treatment during printing B41M5/0011; printers for treating or overcoating copy materials before, during or after printing B41J11/0015
• CPC Class Codes: C09D 11/10 based on artificial resins
• CPC Class Codes: C09D 11/102 containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes
• 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 including an ink composition including resin particles, a colorant, and water, and a treatment solution including an anionic surfactant, water, and a compound configured to aggregate at least one of the colorant or the resin particles in the ink composition, in which the ratio of the content of the anionic surfactant with respect to the content of the compound configured to aggregate at least one of the colorant or the resin particles is 0.001 to 0.600 in terms of mass. An image forming method in which the ink set is used.

Claims

1. An ink set comprising:

an ink composition comprising resin particles, a colorant, and water; and

a treatment solution comprising an anionic surfactant, water, and a compound configured to aggregate at least one of the colorant or the resin particles in the ink composition, wherein a ratio of a content of the anionic surfactant with respect to a content of the compound configured to aggregate at least one of the colorant or the resin particles is 0.001 to 0.600 in terms of mass; and

wherein

the treatment solution further comprises at least one selected from the group consisting of silicone resin particles and silica particles, and

a ratio of a total content of the silicone resin particles and the silica particles with respect to a content of the anionic surfactant is from 0.003 to 0.10 in terms of mass.

2. The ink set according to claim 1, wherein the anionic surfactant has a hydrocarbon group in the structure thereof and a total number of carbon atoms of the hydrocarbon group is 6 or more.

3. The ink set according to claim 1, wherein the anionic surfactant comprises at least one selected from the group consisting of a sulfonic acid salt and a sulfuric acid ester salt.

4. The ink set according to claim 1, wherein the anionic surfactant is at least one selected from the group consisting of a compound represented by the following General Formula (1) and a compound represented by the following General Formula (2)

R₁-L₁-A 

 

General Formula (1)

wherein, in General Formula (1), R₁ represents a branched or linear alkyl group having 6 or more carbon atoms, an unsubstituted naphthyl group, an unsubstituted phenyl group, a naphthyl group substituted with at least one branched or linear alkyl group, or a phenyl group substituted with at least one branched or linear alkyl group;

L₁ represents a single bond, an ester bond, an ether bond, an amide bond, an N-alkylamide bond, or at least one linking group selected from the following Group a;

A represents SO₃M or OSO₃M; and

M represents a sodium ion or a potassium ion;

Group a

5. The ink set according to claim 1, wherein the ratio of the content of the anionic surfactant with respect to the content of the compound configured to aggregate at least one of the colorant or the resin particles is from 0.010 to 0.250 in terms of mass.

6. The ink set according to claim 1, wherein the anionic surfactant is sodium dodecylbenzene sulfonate.

7. The ink set according to claim 1, wherein the compound configured to aggregate at least one of the colorant or the resin particles is an organic acid.

8. An image forming method comprising:

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

or more when 3 seconds have elapsed after a water drop is applied thereto; and

an image forming process of forming an image by ejecting the ink composition of the ink set according to claim 1 to the at least one surface of the substrate to which the treatment solution has been applied, using an inkjet method.

9. The image forming method according to claim 8, wherein the substrate is a paper substrate having a coating layer.