Curable composition, accommodating unit, device for forming two or three dimensional image, method of forming two or three dimensional image, and cured matter

Patent metadata

Field	Value
Publication number	US-11370932-B2
Application number	US-202016748850-A
Country	US
Kind code	B2
Filing date	Jan 22, 2020
Priority date	Jan 22, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

A curable composition contains a polymerizable compound, a polymerization initiator, and a fluorescent whitener comprising a benzoxazole derivative, wherein the proportion of the fluorescent whitener is from 0.10 to 0.3 percent by mass and the proportion of the polymerization initiator is from 5 to 15 percent by mass.

First claim

What is claimed is:

1. A curable composition comprising:
a polymerizable compound comprising at least one monofunctional monomer selected from the group consisting of isobornyl (meth)acrylate, (meth)acryloyl morpholine, cyclic trimethylolpropane formal (meth)acrylate, and hydroxyethyl (meth)acrylate;
a polymerization initiator comprising an acylphosphineoxide compound; and
a fluorescent whitener comprising a benzoxazole derivative,
wherein a proportion of the fluorescent whitener is from 0.10 to 0.3 percent by mass, wherein a proportion of the polymerization initiator is from 5 to 15 percent by mass,
wherein a proportion of the monofunctional monomer is from 84.5 to 94.6 percent by mass,
and
wherein an absolute difference between the Hansen solubility parameter (HSP) value of the polymerizable compound and the HSP value of the polymerization initiator is 4 [(J/cm 3 ) 0.5 ] or less.

2. The curable composition according to claim 1 , wherein the fluorescent whitener comprises 1,4-bis(2-benzoxazolyl)naphthalene.

3. The curable composition according to claim 1 , being a curable clear ink composition containing substantially no coloring material.

4. The curable composition according to claim 1 , being an active energy ray curable composition.

5. The curable composition according to claim 1 for inkjet.

6. An accommodating unit comprising:
a container containing the curable composition of claim 1 .

7. A device for forming a two or three dimensional image comprising:
an accommodating unit accommodating the curable composition of claim 1 ;
an application device configured to apply the curable composition; and
a curing device configured to cure the curable composition.

8. The device according to claim 7 , wherein the curing device includes a light-emitting diode configured to emit light having a wavelength of from 350 to 450 nm.

9. A method of forming a two or three dimensional image, comprising:
applying the curable composition of claim 1 ; and
curing the curable composition.

10. The method according to claim 9 , wherein the curing includes emitting light having a wavelength of from 350 to 450 nm by a light-emitting diode.

11. Cured matter formed by using the curable composition of claim 1 .

12. The curable composition according to claim 1 , which is free of an organic solvent.

13. A method of forming a three dimensional image, comprising:
applying the curable composition of claim 1 onto a stage;
curing the curable composition to form a cured layer on the stage; and
applying the curable composition onto the cured layer.

14. The curable composition according to claim 1 , consisting essentially of:
the polymerizable compound;
the polymerization initiator;
the fluorescent whitener; and
optionally a polymerization inhibitor.

15. The curable composition according to claim 1 , further comprising:
at least one component selected from the group consisting of a coloring material, a surfactant, a polymerization inhibitor, a leveling agent, a defoaming agent, a penetration-enhancing agent, a wetting agent (humectant), a fixing agent, a viscosity stabilizer, a fungicide, a preservative, an antioxidant, an ultraviolet absorbent, a chelate agent, a pH regulator, and a thickener.

16. The curable composition according to claim 15 , wherein the fluorescent whitener is 1,4-bis(2-benzoxazolyl)naphthalene.

17. A method of forming a three dimensional image, comprising:
applying the curable composition of claim 15 onto a stage;
curing the curable composition to form a cured layer on the stage; and
applying the curable composition onto the cured layer.

18. The curable composition according to claim 1 , wherein the polymerization initiator comprises at least one selected from the group consisting of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

19. The curable composition according to claim 2 , wherein the polymerization initiator comprises at least one selected from the group consisting of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

Assignees

• Ricoh Co Ltd

Inventors

• Kojima Satoshi
• Shimizu Takayuki
• Hasegawa Shin
• Kobayashi Hiroki
• Matsushita Yuuki
• Ishijima Yukiko

Classifications

• B41J2/01

  Ink jet · CPC title

• B41J11/00214

  using UV radiation · CPC title

• B41J11/002

  Curing or drying the ink on the copy materials, e.g. by heating or irradiating · CPC title

• C08F2/48

  by ultraviolet or visible light · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title