# US 12,180,376 B2 · Radiation-curable ink jet composition and recording method

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- Number: US 12,180,376 B2
- Document ID: US12180376B2
- Status: Granted
- Kind: B2
- Application number: 17/676,280
- Filed: 2022-02-21
- Published: 2022-08-25
- Granted: 2024-12-31
- Earliest claimed: 2021-02-22
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Kyohei Tanaka; Emi Takeuchi
- Web page: https://patentgrep.com/patent/US12180376B2

## CPC

- C09D 11/322: Pigment inks
- B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)}
- B41M 7/0081: {using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams}
- C09D 11/037: characterised by the pigment
- 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
- C09D 11/107: from unsaturated acids or derivatives thereof
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- 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)
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

A radiation-curable ink jet composition includes inorganic particles, a coloring material, and a polymerizable compound. The polymerizable compound contains a monofunctional monomer. A content of the monofunctional monomer is 80% by mass or greater with respect to a total amount of the polymerizable compound. A content of the inorganic particles is 10% by mass or less with respect to a total amount of the ink composition.

## Claims

### Claim 1

A radiation-curable ink jet composition comprising:
inorganic particles;
a coloring material; and
a polymerizable compound,
wherein the polymerizable compound contains a monofunctional monomer,
a content of the monofunctional monomer is 80% by mass or greater with respect to a total amount of the polymerizable compound,
a content of the inorganic particles is 10% by mass or less with respect to a total amount of the ink composition,
the monofunctional monomer contains a monofunctional monomer having an alicyclic group, and a content of the monofunctional monomer having the alicyclic group is in a range of 15% to 35% relative to a total amount of the polymerizable compound,
the polymerizable compound contains a polyfunctional monomer, and
the polyfunctional monomer contains a vinyl group-containing (meth) acrylate represented by Formula (1):
H2C═CR1—CO—OR2—O—CH═CH—R3(1)
wherein in the formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic residue having 2 to 20 carbon atoms, and R3 represents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.

### Claim 2 (depends on 1)

The radiation-curable ink jet composition according to claim 1, wherein
the inorganic particles contain alumina.

### Claim 3 (depends on 1)

The radiation-curable ink jet composition according to claim 1, wherein
the coloring material is a pigment.

### Claim 4 (depends on 3)

The radiation-curable ink jet composition according to claim 3, wherein
the pigment is a colored pigment.

### Claim 5 (depends on 1)

The radiation-curable ink jet composition according to claim 1, wherein
the content of the inorganic particles is 5.0% by mass or less with respect to the total amount of the ink composition.

### Claim 6 (depends on 1)

A recording method comprising:
an ejecting step of ejecting, from an ink jet head, the radiation-curable ink jet composition according to claim 1 to be adhered to a recording medium; and
an irradiating step of irradiating with radiation the radiation-curable ink jet composition adhering to the recording medium.