Photocurable ink jet recording ink composition and ink jet recording method

Inventors: Toshiyuki Yoda (Matsumoto, JP); Hiroshi Fukumoto (Shiojiri, JP)

Assignee: Seiko Epson Corporation

C09D11/101 B41J2/2107 C09D11/30

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Quick Facts

Patent No.: US 9,090,787
App. No.: 13/611,095
Granted: Jul 28, 2015
Kind: B2

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Abstract

Provided is a photocurable ink jet recording ink composition having a low viscosity and excellent curing property and photopolymerization initiator solubility. The photocurable ink jet recording ink composition includes a polymerizable compound and a photopolymerization initiator. The polymerizable compound includes vinyl ether group-containing (meth)acrylic esters represented by Formula (I) in an amount of 20% by mass or more based on the total mass of the ink composition. The photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator. The content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4.

Claims (30)

1. A photocurable ink jet recording ink composition comprising a polymerizable compound and a photopolymerization initiator, wherein

the polymerizable compound includes:

vinyl ether group-containing (meth)acrylic esters represented by the following Formula (I):

CH 2 ═CR 1 —COOR 2 —CH═CH—R 3 (I)

(wherein, 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) in an amount of 20% by mass or more based on the total mass of the ink composition;

the polymerizable compound further includes at least one monymer wich is monofunctional, difunctional, or tri- or more-functional monomer other than the vinyl ether group-containing (meth)acrylate esters represented by the formula (I), in an amount of 40% by mass or less of the ink composition; and

the photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator, wherein the content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4 by mass standard.

2. The photocurable ink jet recording ink composition according to claim 1 , wherein the thioxanthone photopolymerization initiator is at least one of 2,4-diethylthioxanthone and 2-isopropylthioxanthone.

3. The photocurable ink jet recording ink composition according to claim 1 , wherein the content of the thioxanthone photopolymerization initiator is 4% by mass or less based on the total mass of the ink composition.

4. The photocurable ink jet recording ink composition according to claim 1 , wherein the bisacylphosphine oxide photopolymerization initiator is bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

5. The photocurable ink jet recording ink composition according to claim 1 , wherein the polymerizable compound further includes phenoxyethyl (meth)acrylate in an amount of less than 30% by mass based on the total mass of the ink composition.

6. The photocurable ink jet recording ink composition according to claim 1 , wherein the vinyl ether group-containing (meth)acrylic esters are 2-(vinyloxyethoxy)ethyl acrylate.

7. An ink jet recording method comprising:

discharging a photocurable ink jet recording ink composition according to claim 1 onto a recording medium; and