Ultraviolet ray-curable clear ink composition and recording method

Patent metadata

Field	Value
Publication number	US-9469771-B2
Application number	US-201313850749-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Mar 28, 2012
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An ultraviolet ray-curable clear ink composition includes a polymerizable compound; and a photopolymerization initiator, in which the polymerizable compound contains a vinyl ether group-containing (meth)acrylic acid ester represented by the following formula (I) and 5% by mass to 25% by mass of urethane oligomer with respect to the total mass of the ink composition.

CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3   (I)
(in the formula (I), R 1 represents a hydrogen atom or a methyl group; R 2 represents a divalent organic residue having 2 to 20 carbon atoms; and R 3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms).

First claim

What is claimed is:

1. An ultraviolet ray-curable clear ink composition comprising:
a polymerizable compound; and
a photopolymerization initiator,
wherein the polymerizable compound contains a vinyl ether group-containing (meth)acrylic acid ester represented by the following formula (I), and 5% by mass to 25% by mass of urethane oligomer with respect to the total mass of the ink composition
CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3   (I)

(in the formula (I), R 1 represents a hydrogen atom or a methyl group; R 2 represents a divalent organic residue having 2 to 20 carbon atoms; and R 3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms),
wherein the polymerizable compound further contains at least one monofunctional (meth)acrylate having an aromatic ring structure present in 5 to 40% by mass with respect to the total mass of the ink composition.

2. The ultraviolet ray-curable clear ink composition according to claim 1 ,
wherein the urethane oligomer contains a bifunctional to tetrafunctional (meth)acryloyl group.

3. The ultraviolet ray-curable clear ink composition acquiring to claim 1 ,
wherein the urethane oligomer is an aliphatic urethane oligomer.

4. The ultraviolet ray-curable clear ink composition according to claim 1 ,
wherein the polymerization initiator contains 5% by mass to 13% by mass of acylphosphine oxide compound with respect to the total mass of the ink composition.

5. The ultraviolet ray-curable clear ink composition according to claim 1 ,
wherein the polymerizable compound further contains at least a monofunctional (meth)acrylate which has an aliphatic structure having a hydroxyl group, wherein the content of a monofunctional (meth)acrylate which has an aliphatic structure having a hydroxyl group is 5 to 40% by mass, relative to the total mass of the ink composition.

6. The ultraviolet ray-curable clear ink composition according to claim 1 ,
wherein a content of the vinyl ether group-containing (meth)acrylic acid ester represented by the formula (I) is 20% by mass to 70% by mass with respect to the total mass of the ink composition.

7. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 1 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

8. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 2 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

9. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 3 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

10. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 4 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

11. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 5 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

12. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 6 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 8 μm to 40 μm.

13. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 1 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

14. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 2 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

15. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 3 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

16. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 4 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

17. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 5 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

18. A recording method comprising:
discharging the ultraviolet ray-curable clear ink composition according to claim 6 onto a recording medium to be attached thereonto; and
curing the attached ultraviolet ray-curable clear ink composition,
wherein the thickness of the cured ultraviolet ray-curable clear ink composition is 15 μm to 40 μm.

19. The recording method according to claim 7 ,
wherein in the curing, the ultraviolet ray-curable clear ink composition is irradiated with ultraviolet rays emitted from a light emitting diode having a peak wavelength of 360 nm to 420 nm to cure the ultraviolet ray-curable clear ink composition.

20. The recording method according to claim 13 ,
wherein the discharging and the irradiation of ultraviolet rays on the ultraviolet ray-curable clear ink composition, attached onto the recording medium in the discharging, are performed multiple times.

Assignees

• Seiko Epson Corp

Inventors

• Mizutaki Yusuke
• Nakane Hiroki
• Okamoto Eiji

Classifications

• B41J11/002

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

• C09D11/30 Primary

  Inkjet printing inks · CPC title

• B41J2/2107

  characterised by the ink properties (supplying ink in a solid state B41J2/17593) · CPC title

• C09D11/101

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• B41M7/0081

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title