# US 12,760,196 B2 · Inkjet ink set, inkjet recording apparatus, and inkjet recording method

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- Number: US 12,760,196 B2
- Document ID: US12760196B2
- Status: Granted
- Kind: B2
- Application number: 18/813,137
- Filed: 2024-08-23
- Published: 2026-02-26
- Granted: 2026-10-13
- Earliest claimed: 2024-08-23
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: Kyocera Document Solutions Inc.
- Inventors: Yasuko Takaori
- Web page: https://patentgrep.com/patent/US12760196B2

## CPC

- C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing
- B41J 2/01: Ink jet
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 11/54: Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
- 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

## Abstract

An inkjet ink set includes: a first ink; and a second ink. The first ink includes a first pigment, a first binder resin particle, and a first aqueous medium. The second ink includes a second pigment, a second binder resin particle, and a second aqueous medium. The first binder resin particle includes a polyolefin resin. A breaking elongation of the first binder resin particle at 25° C. is greater than 60% and 750% or less. The second binder resin particle includes a urethane resin. A breaking elongation of the second binder resin particle at 25° C. is 60% or less.

## Claims

### Claim 1

An inkjet ink set, comprising:
a first ink; and
a second ink,
the first ink including a first pigment, a first binder resin particle, and a first aqueous medium,
the second ink including a second pigment, a second binder resin particle, and a second aqueous medium,
the first binder resin particle including a polyolefin resin,
a breaking elongation of the first binder resin particle at 25° C. being greater than 60% and 750% or less,
the second binder resin particle including a urethane resin,
a breaking elongation of the second binder resin particle at 25° C. being 60% or less.

### Claim 2 (depends on 1)

The inkjet ink set according to claim 1, wherein
the polyolefin resin has a glass transition temperature of 80° C. or more and 130° C. or less, and
the urethane resin has a glass transition temperature of 60° C. or more and 90° C. or less.

### Claim 3 (depends on 1)

The inkjet ink set according to claim 1, wherein
each of the first ink and the second ink further includes a silicone surfactant.

### Claim 4 (depends on 1)

The inkjet ink set according to claim 1, wherein
a content ratio of the first binder resin particle in the first ink is 1.0 mass % or more and 8.0 mass % or less, and
a content ratio of the second binder resin particle in the second ink is 1.0 mass % or more and 8.0 mass % or less.

### Claim 5 (depends on 1)

The inkjet ink set according to claim 1, wherein
the first ink is a white ink, and
the second ink is a color ink.

### Claim 6 (depends on 1)

The inkjet ink set according to claim 1, wherein
the first ink is an ink for a base, and
the second ink is an ink for ejection on the base.

### Claim 7 (depends on 1)

The inkjet ink set according to claim 1, wherein
the first ink and the second ink are used for printing on a non-absorbent recording medium.

### Claim 8 (depends on 1)

The inkjet ink set according to claim 1, wherein
a number average primary particle size of the first binder resin particle is 10 nm or more and 100 nm or less, and
a number average primary particle size of the second binder resin particle is 10 nm or more and 100 nm or less.

### Claim 9 (depends on 1)

An inkjet recording apparatus, comprising:
the inkjet ink set according to claim 1;
a first recording head that ejects the first ink to a recording medium; and
a second recording head that ejects the second ink to at least part of a region of the recording medium to which the first ink has been ejected,
the recording medium being a non-absorbent recording medium.

### Claim 10 (depends on 1)

An inkjet recording method, comprising:
a first step of ejecting the first ink to a recording medium using the inkjet ink set according to claim 1; and
a second step of ejecting the second ink to at least part of a region of the recording medium to which the first ink has been ejected,
the recording medium being a non-absorbent recording medium.