Gel particles, ink composition and production method thereof, photosensitive composition, and image forming method

Patent metadata

Field	Value
Publication number	US-10428231-B2
Application number	US-201715450050-A
Country	US
Kind code	B2
Filing date	Mar 6, 2017
Priority date	Sep 29, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

There are provided gel particles which have a polymerizable group, and a three-dimensional crosslinked structure including at least one bond selected from a urethane bond and a urea bond, and enclose a photopolymerization initiator, an ink composition including the gel particles and a production method thereof, a photosensitive composition, and an image forming method.

First claim

What is claimed is:

1. An ink composition for ink jet comprising:
gel particles which have a polymerizable group, and a three-dimensional crosslinked structure including at least one bond selected from a urethane bond and a urea bond, and enclose a photopolymerization initiator; and
water.

2. The ink composition for ink jet according to claim 1 , wherein the photopolymerization initiator includes at least one of a carbonyl compound or an acylphosphine oxide compound.

3. The ink composition for ink jet according to claim 1 , wherein the gel particles have a hydrophilic group on the surfaces.

4. The ink composition for ink jet according to claim 3 , wherein the hydrophilic group is at least one type selected from a group having a polyether structure, a carboxylic acid group, and a salt of a carboxylic acid group.

5. The ink composition for ink jet according to claim 1 , wherein the gel particles further enclose a polymerizable monomer.

6. The ink composition for ink jet according to claim 1 , wherein the gel particles further enclose a sensitizer.

7. The ink composition for ink jet according to claim 1 , further comprising a polymerizable compound in the outer portion of the gel particles.

8. The ink composition for ink jet according to claim 1 , further comprising a photopolymerization initiator in the outer portion of the gel particles.

9. The ink composition for ink jet according to claim 1 , wherein the total solid content amount of the gel particles is 50% by mass or greater with respect to the total solid content of the ink composition for ink jet.

10. The ink composition for ink jet according to claim 1 , wherein the volume average particle diameter of the gel particles is from 0.01 μm to 10.0 μm.

11. A production method of the ink composition for ink jet according claim 1 , comprising:
obtaining an emulsion by mixing and emulsifying any one oil phase component selected from an oil phase component including a photopolymerization initiator, a tri- or higher functional isocyanate compound, a polymerizable monomer, and an organic solvent, an oil phase component including a photopolymerization initiator, a tri- or higher functional isocyanate compound having a polymerizable group, and an organic solvent, and an oil phase component including a photopolymerization initiator, a tri- or higher functional isocyanate compound having a polymerizable group, a polymerizable monomer, and an organic solvent, with an aqueous phase component including water; and
gelling the above emulsion by heating.

12. The production method of the ink composition for ink jet according to claim 11 , wherein the tri- or higher functional isocyanate compound is an isocyanate compound derived from at least one type selected from isophorone diisocyanate, hexamethylene diisocyanate, trimethyl hexamethylene diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, m-xylylene diisocyanate, and dicyclohexylmethane-4,4′-diisocyanate.

13. The production method of the ink composition for ink jet according to claim 11 , wherein the oil phase component or the aqueous phase component further comprises a surfactant.

14. An image forming method, comprising:
applying the ink composition for ink jet according to claim 1 to a recording medium by ink jet method; and
irradiating the ink composition for ink jet applied to the recording medium with active energy rays.

15. The ink composition for ink jet according to claim 1 , wherein the three-dimensional crosslinked structure has a structure of a reaction product of water and a tri- or higher functional isocyanate compound represented by General Formula (2) below:

wherein, in General Formula (2); X represents a (l+m+n) valent organic group; l, m, and n are each independently 0 or greater; l+m+n is 3 or greater; Y 1 , Y 2 , and Y 3 each independently represent O, S, or NH; R 1 , R 2 , and R 3 each independently represent an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 1 to 20 carbon atoms, or an arylene group which may have a substituent having 1 to 20 carbon atoms.

16. The ink composition for ink jet according to claim 1 , wherein the three-dimensional crosslinked structure has a structure of a reaction product of water, a monoether of polyethylene oxide, and a tri- or higher functional isocyanate compound represented by General Formula (2) below:

wherein, in General Formula (2); X represents a (l+m+n) valent organic group; l, m, and n are each independently 0 or greater; l+m+n is 3 or greater; Y 1 , Y 2 , and Y 3 each independently represent O, S, or NH; R 1 , R 2 , and R 3 each independently represent an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 1 to 20 carbon atoms, or an arylene group which may have a substituent having 1 to 20 carbon atoms.

17. The production method of the ink composition for ink jet according to claim 11 , wherein the tri- or higher functional isocyanate compound is a tri- or higher functional isocyanate compound represented by General Formula (2) below:

wherein, in General Formula (2); X represents a (l+m+n) valent organic group; l, m, and n are each independently 0 or greater; l+m+n is 3 or greater; Y 1 , Y 2 , and Y 3 each independently represent O, S, or NH; R 1 , R 2 , and R 3 each independently represent an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 1 to 20 carbon atoms, or an arylene group which may have a substituent having 1 to 20 carbon atoms.

Assignees

• Fujifilm Corp

Inventors

• Sato Noriaki
• Suzuki Shota

Classifications

• C08G18/8175

  with esters of acrylic or alkylacrylic acid having only one group containing active hydrogen · CPC title

• C08G18/8025

  Masked aliphatic or cycloaliphatic polyisocyanates · CPC title

• C09D11/30

  Inkjet printing inks · CPC title

• C08F290/062

  Polyethers · CPC title

• C08G18/283

  Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds · CPC title