Photo-curable ink jet ink set and ink jet recording method using the same

Inventors: Keitaro Nakano (Matsumoto, JP); Jun Ito (Shimosuwa-machi, JP)

Assignee: SEIKO EPSON CORPORATION

C09D11/30 B41J2/17 B41J2/2114 C09D11/101 C09D11/322 C09D11/38 C09D11/40

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Quick Facts

Patent No.: US 9,243,154
App. No.: 13/781,209
Granted: Jan 26, 2016
Kind: B2

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Abstract

A photo-curable ink jet ink set includes an undercoating photo-curable ink jet ink containing a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I), and an overcoating photo-curable ink jet ink. The undercoating photo-curable ink jet ink has a higher surface tension than the overcoating photo-curable ink jet ink.

Claims (33)

1. A photo-curable ink jet ink set comprising:

an undercoating photo-curable ink jet ink having a surface tension and containing a (meth) acrylic acid ester having a vinyl ether group expressed by general formula (I):

CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3 , wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents a divalent organic residue having a carbon number of 2 to 20, and R 3 represents a hydrogen atom or a monovalent organic residue having a carbon number of 1 to 11; and

an overcoating photo-curable ink jet ink having a surface tension,

wherein the surface tension of the undercoating photocurable ink jet ink is higher than the surface tension of the overcoating photo-curable ink jet ink, and

wherein the undercoating photo-curable ink jet ink and the overcoating photo-curable ink jet ink each contain a coloring material.

2. The photo-curable ink jet ink set according to claim 1 , wherein the difference in surface tension between the undercoating photo-curable ink jet ink and the overcoating photo-curable ink jet ink is 5 mN/m or more.

3. The photo-curable ink jet ink set according to claim 1 , wherein the content of the (meth)acrylic acid ester in the undercoating photo-curable ink jet ink is 20% to 80% by mass relative to the total mass of the undercoating photo-curable ink jet ink.

4. The photo-curable ink jet ink set according to claim 1 , wherein the overcoating photo-curable ink jet ink contains a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I) in a lower content than the content of the (meth)acrylic acid ester in the undercoating photo-curable ink jet ink.

5. The photo-curable ink jet ink set according to claim 1 , wherein the undercoating photo-curable ink jet ink contains an acrylic surfactant.

6. The photo-curable ink jet ink set according to claim 1 , wherein the overcoating photo-curable ink jet ink contains a silicone surfactant.

7. The photo-curable ink jet ink set according to claim 1 , wherein the overcoating photo-curable ink jet ink is a color ink containing a nonwhite coloring material.

8. The photo-curable ink jet set according to claim 1 , wherein the undercoating photo-curable ink jet ink is a white ink containing a white coloring material.

9. The photo-curable ink jet ink set according to claim 1 , wherein the overcoating photo-curable ink jet ink contains a coloring material in a range from 0.5 to 20% by mass relative to the total mass of the ink.

10. The photo-curable ink jet ink set according to claim 1 , wherein the overcoating photo-curable ink jet ink contains at least one of an organic pigment or an inorganic pigment as the coloring material.

11. An ink jet recording method using the photo-curable ink jet ink set as set forth in claim 1 , the method comprising: