Aqueous resin based inkjet inks

Patent metadata

Field	Value
Publication number	US-10240056-B2
Application number	US-201815866502-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Apr 15, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

An inkjet ink includes a) an aqueous medium; and b) capsules composed of a polymeric shell surrounding a core; wherein the capsules are dispersed in the aqueous medium using a dispersing group covalently bonded to the polymeric shell; wherein the core contains a photoinitiator and one or more chemical reactants capable of forming a reaction product upon application of UV light; wherein the capsules have an average particle size of no more than 4 μm as determined by dynamic laser diffraction; and wherein the photoinitiator is a diffusion hindered photoinitiator selected from the group consisting of multifunctional photoinitiators, oligomeric photoinitiators, polymeric photoinitiators and polymerizable photoinitiators.

First claim

What is claimed is:

1. An inkjet ink comprising:
an aqueous medium; and
capsules including a polymeric shell surrounding a core; wherein
the aqueous medium includes one or more surfactants selected from the group consisting of fatty acid salts, ester salts of a higher alcohol, alkylbenzene sulphonate salts, sulphosuccinate ester salts and phosphate ester salts of a higher alcohol, ethylene oxide adducts of a higher alcohol, ethylene oxide adducts of an alkylphenol, ethylene oxide adducts of a polyhydric alcohol fatty acid ester, and acetylene glycol adducts and ethylene oxide adducts thereof;
the capsules are dispersed in the aqueous medium by a dispersing group covalently bonded to the polymeric shell;
the core includes a photoinitiator and one or more chemical reactants that form a reaction product upon application of UV light;
the capsules have an average particle size of no more than 4 μm as determined by dynamic laser diffraction;
the photoinitiator is a diffusion hindered photoinitiator selected from the group consisting of multifunctional photoinitiators, oligomeric photoinitiators, polymeric photoinitiators, and polymerizable photoinitiators; and
the dispersing group is selected from the group consisting of a carboxylic acid or salt thereof, a sulfonic acid or salt thereof, a phosphoric acid ester or salt thereof, a phosphonic acid or salt thereof, an ammonium group, a sulfonium group, and a phosphonium group.

2. The inkjet ink according to claim 1 , wherein the polymeric shell includes a polymer selected from the group consisting of a polyamide, a melamine based polymer, a poly(urea-urethane) polymer, and copolymers thereof.

3. The inkjet ink according to claim 1 , wherein the one or more chemical reactants include a monomer, oligomer, or polymer that is curable by free radical polymerization or by cationic polymerization.

4. The inkjet ink according to claim 3 , wherein the monomer, oligomer, or polymer includes at least one acrylate group as a polymerizable group.

5. The inkjet ink according to claim 1 , wherein the photoinitiator is a polymeric photoinitiator or a polymerizable photoinitiator.

6. The inkjet ink according to claim 5 , wherein the photoinitiator includes a polymeric or polymerizable thioxanthone.

7. The inkjet ink according to claim 1 , further comprising an optothermal converting agent.

8. The inkjet ink according to claim 7 , wherein the optothermal converting agent is an infrared dye.

9. The inkjet ink according to claim 1 , further comprising a colorant.

10. The inkjet ink according to claim 1 , wherein the aqueous medium includes a polymeric latex particle.

11. The inkjet ink according to claim 1 , wherein the polymeric shell is crosslinked.

12. An inkjet printing method including the steps of:
jetting an inkjet ink according to claim 1 on a substrate; and
applying UV light to the inkjet ink jetted on the substrate to form a reaction product from the one or more chemical reactants in the capsules.

13. The inkjet printing method according to claim 12 , wherein the substrate is a textile, leather, glass, pharmaceutical packaging, or food packaging.

14. The inkjet printing method according to claim 13 , wherein the step of applying UV light is performed using UV LEDs with a wavelength larger than 360 nm.

Assignees

• Agfa Nv

Inventors

• Loccufier Johan
• Decoster Luc

Classifications

• C09D11/30 Primary

  Inkjet printing inks · CPC title

• C09D11/328

  characterised by dyes · CPC title

• B41J2/01

  Ink jet · CPC title

• B01J13/14

  Polymerisation; cross-linking · CPC title

• C09D11/10

  based on artificial resins · CPC title