Active ray-curable inkjet ink, and image formation method using same

Patent metadata

Field	Value
Publication number	US-9528018-B2
Application number	US-201414895803-A
Country	US
Kind code	B2
Filing date	Jun 9, 2014
Priority date	Jun 7, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The purpose of the present invention is to provide: an active ray-curable inkjet ink which has good dispersion stability during storage, good surface smoothness when ejected on a recording medium, and does not undergo the bleeding of a fatty acid onto the surface of the ink; and an image formation method using the active ray-curable inkjet ink. The purpose can be achieved by an active ray-curable inkjet ink which contains: a photopolymerizable compound; at least one wax in the total mass of 1 to 8 mass % relative to the whole mass of the ink; and a fatty acid in the total mass of 0.0001 to 0.10 mass % relative to the whole mass of the wax.

First claim

The invention claimed is:

1. An actinic radiation-curable inkjet ink, comprising:
an actinic radiation-curable compound;
at least one wax having a total mass of 1 to 8 wt % to a total mass of the ink; and
a fatty acid having a total mass of 0.0001 to 0.10 wt % to the total mass of the wax.

2. The actinic radiation-curable inkjet ink according to claim 1 , wherein the total mass of the wax to the total mass of the ink is 1 to 4 wt %.

3. The actinic radiation-curable inkjet ink according to claim 1 , wherein the wax is at least one of compounds represented by General Formulas (G1) and (G2):
R1-CO—R2  General Formula (G1):

R3-COO—R4  General Formula (G2):

where R1 to R4 each independently represent an alkyl chain which has a straight chain moiety having 12 or more carbon atoms and which may have a branch.

4. The actinic radiation-curable inkjet ink according to claim 1 , wherein the fatty acid is a compound having 12 or more carbon atoms.

5. An image forming method using the actinic radiation-curable inkjet ink according to claim 1 , wherein
a temperature of a recording medium at a time when the actinic radiation-curable inkjet ink is landed on the recording medium is set within a range 20° C. to 7° C. lower than a sol-gel phase transition temperature of the actinic radiation-curable inkjet ink.

Assignees

• Konica Minolta Inc

Inventors

• Yazaki Yuka
• Iwata Takashi
• Masumi Satoshi
• Maeda Akio

Classifications

• B41J2202/21

  Line printing · 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

• B41J11/002

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

• B41M5/0023

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

• C09D11/12

  based on waxes or bitumen · CPC title