# US 11,898,042 B2 · Photocurable ink composition for ink jet recording and ink jet recording method

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- Number: US 11,898,042 B2
- Document ID: US11898042B2
- Status: Granted
- Kind: B2
- Application number: 17/232,833
- Filed: 2021-04-16
- Published: 2021-09-30
- Granted: 2024-02-13
- Earliest claimed: 2011-07-08
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hiroaki Kida; Hiroshi Fukumoto; Toru Saito; Keitaro Nakano; Hiroki Nakane
- Web page: https://patentgrep.com/patent/US11898042B2

## CPC

- C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C08K 3/013: Fillers, pigments or reinforcing additives
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- B41J 11/00214: {using UV radiation}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention provides a photocurable ink composition for ink jet recording with excellent curability. The photocurable ink composition for ink jet recording includes polymerizable compounds, a photopolymerization initiator, and a colorant, wherein the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by general formula (I): CH2═CR1—COOR2—O—CH═CH—R3 (I) (wherein R1 is a hydrogen atom or a methyl group, R2 is a divalent organic residue having 2 to 20 carbon atoms, and R3 is a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms) and phenoxyethyl (meth)acrylate.

## Claims

### Claim 1

A photocurable ink composition for ink jet recording, comprising:
polymerizable compounds;
a photopolymerization initiator; and
a colorant,
wherein the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by general formula (I):
CH2═CR1—COOR2—O—CH═CH—R3 (I)
(wherein R1 is a hydrogen atom or a methyl group, R2 is a divalent organic residue having 2 to 20 carbon atoms, and R3 is a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms) and phenoxyethyl (meth)acrylate, polyfunctional (meth)acrylate,
wherein the content of the phenoxyethyl (meth)acrylate is 9 to 60% by mass relative to the total mass of the ink composition,
wherein the photopolymerization initiator contains 15% by mass or less of an acylphosphine oxide compound relative to the total mass of the ink composition.

### Claim 2 (depends on 1)

The photocurable ink composition for ink jet recording according to claim 1, wherein the photopolymerization initiator contains 7% by mass or more of an acylphosphine oxide compound relative to the total mass of the ink composition.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The photocurable ink composition for ink jet recording according to claim 1, wherein the content of the vinyl ether group-containing (meth)acrylate is 10 to 60% by mass relative to the total mass of the ink composition.

### Claim 5 (depends on 1)

The photocurable ink composition for ink jet recording according to claim 1, wherein the ink composition is cured by irradiation with ultraviolet light with an emission peak wavelength in a range of 350 to 420 nm and an irradiation energy of 300 mJ/cm2 or less.

### Claim 6 (depends on 1)

The photocurable ink composition for ink jet recording according to claim 1, wherein the content of the vinyl ether group-containing (meth)acrylate represented by general formula (I) is no more than 40% by mass relative to the total mass of the ink composition.