Gel particles, photosensitive composition, ink composition, method of producing water dispersion of gel particles, and image forming method

Patent metadata

Field	Value
Publication number	US-2017174916-A1
Application number	US-201715447113-A
Country	US
Kind code	A1
Filing date	Mar 2, 2017
Priority date	Sep 30, 2014
Publication date	Jun 22, 2017
Grant date	—

Abstract

Provided are gel particles each having a three-dimensional crosslinked structure including at least one bond selected from a urethane bond and a urea bond, the gel particles each including: a polymerizable group; and a functional group that generates radicals by irradiation with active energy rays, a photosensitive composition containing the gel particles, an ink composition, a method of producing water dispersion of gel particles, and an image forming method.

First claim

What is claimed is:

1 . Gel particles each having a three-dimensional crosslinked structure including at least one bond selected from a urethane bond and a urea bond, the gel particles each comprising:
a polymerizable group; and a functional group that generates radicals by irradiation with active energy rays.

2 . The gel particles according to claim 1 ,
wherein the functional group that generates radicals by irradiation with active energy rays is a group having at least one selected from an acetophenone structure represented by Formula A below, a monoacylphosphine oxide structure represented by Formula B below, and a bisacylphosphine oxide structure represented by Formula C below.

in Formulae A, B, and C, R′s each independently represent a monovalent group or *-L-, at least one of R′s in the respective formulae represents *-L-, L represents a divalent organic group, and * represents a bonding site with a three-dimensional crosslinked structure.

3 . The gel particles according to claim 1 , each further comprising:
a hydrophilic group on a surface.

4 . The gel particles according to claim 1 , each further comprising:
a polymerizable monomer.

5 . The gel particles according to claim 1 , having a volume average particle diameter of 0.01 μm to 10.0 μm.

6 . A photosensitive composition comprising:
the gel particles according to claim 1 ; and water.

7 . The photosensitive composition according to claim 6 , further comprising:
a polymerizable compound outside the gel particles.

8 . An ink composition comprising:
the gel particles according to claim 1 ; water; and a colorant.

9 . The ink composition according to claim 8 , further comprising:
a polymerizable compound outside the gel particles.

10 . A method of producing water dispersion of gel particles, comprising:
obtaining an emulsion, by mixing and emulsifying any one oil phase component selected from an oil phase component including a trifunctional or higher isocyanate compound having a functional group that generates radicals by irradiation with active energy rays, a polymerizable monomer, and an organic solvent, an oil phase component including a trifunctional or higher isocyanate compound having a functional group that generates radicals by irradiation with active energy rays, a trifunctional or higher isocyanate compound having a polymerizable group, and an organic solvent, an oil phase component including a trifunctional or higher isocyanate compound having a polymerizable group, a functional group that generates radicals by irradiation with active energy rays, a polymerizable monomer, and an organic solvent, and an oil phase component including a trifunctional or higher isocyanate compound having a functional group that generates radicals by irradiation with active energy rays, a trifunctional or higher isocyanate compound having a polymerizable group, a polymerizable monomer, and an organic solvent, and a water phase component including water; and gelling the emulsion by heating.

11 . The method of producing water dispersion of gel particles according to claim 10 , further comprising:
mixing the gel particles obtained by the gelling of the emulsion, water, and a colorant.

12 . The method of producing water dispersion of gel particles according to claim 10 , wherein the trifunctional or higher isocyanate compound is an isocyanate compound derived from at least one selected from isophorone diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, 1,3-bis(isocyanatemethyl) cyclohexane, m-xylylene diisocyanate, and dicyclohexylmethane-4,4′-diisocyanate.

13 . The method of producing water dispersion of gel particles according to claim 10 , wherein the oil phase component or the water phase component further comprises a surfactant.

14 . An image forming method comprising:
applying the ink composition according to claim 8 on a recording medium; and irradiating the ink composition applied on the recording medium with active energy rays.

Assignees

• Fujifilm Corp

Inventors

• Sato Noriaki
• Suzuki Shota

Classifications

• C08G18/8029

  Masked aromatic polyisocyanates · CPC title

• C08G18/348

  Hydroxycarboxylic acids · CPC title

• C08G18/757

  containing at least two isocyanate or isothiocyanate groups linked to the cycloaliphatic ring by means of an aliphatic group · CPC title

• C08G18/3889

  having nitrogen in addition to phosphorus · CPC title

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title