# US 9,518,190 B2 · Inkjet ink, ink cartridge, inkjet recording method, inkjet recording device, and inkjet recorded matter

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- Number: US 9,518,190 B2
- Document ID: US9518190B2
- Status: Granted
- Kind: B2
- Application number: 14/739,140
- Filed: 2015-06-15
- Published: 2015-10-29
- Granted: 2016-12-13
- Earliest claimed: 2010-08-04
- Assignees: Ricoh Company, Ltd.
- Applicants: Ricoh Company, Ltd.
- Inventors: Hiroshi Gotou; Kiyofumi Nagai; Michihiko Namba; Hidetoshi Fujii; Yuuki Yokohama
- Web page: https://patentgrep.com/patent/US9518190B2

## CPC

- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C08K 5/06: Ethers; Acetals; Ketals; Ortho-esters
- C08K 5/20: Carboxylic acid amides
- C08K 5/23: Azo-compounds
- C08K 5/3417: condensed with carbocyclic rings
- C08K 5/3437: condensed with carbocyclic rings
- C08K 5/5419: containing at least one Si—C bond
- C09D 11/322: Pigment inks
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

To provide an inkjet ink, which contains: water; a wetting agent; a surfactant; and a colorant, wherein the wetting agent contains at least an amide compound represented by the following structural formula (I):

## Claims

### Claim 1

An ink, comprising:
water,
a colorant, and
an amide compound represented by the following structural formula (I):

### Claim 2 (depends on 1)

The ink according to claim 1, wherein an amount of the amide compound represented by the structural formula (I) in the ink is 1% by mass to 50% by mass.

### Claim 3 (depends on 1)

An ink cartridge, comprising:
a container; and
an ink as housed in the container,
wherein the ink is the ink as claimed in claim 1.

### Claim 4

An inkjet recording method, comprising:
applying a stimulus to an ink, thereby recording an image with the ink; and heating the image to fix the image on an image recording medium,
wherein the ink comprises:
water,
a colorant, and
an amide compound represented by the following structural formula (I):

### Claim 5 (depends on 1)

The ink of claim 1, wherein an amount of the water in the ink is from 20% by mass to 60% by mass.

### Claim 6 (depends on 1)

The ink of claim 1, wherein the ink further comprises at least one selected from the group consisting of polyurethane resin particles and acryl-silicone resin particles.

### Claim 7 (depends on 1)

The ink of claim 1, wherein the ink further comprises a water-dispersible resin having a minimum film forming temperature (MFT) of 30° C. or lower.

### Claim 8 (depends on 1)

The ink of claim 1, wherein the ink further comprises a water-dispersible resin having a glass transition temperature of −30° C. or higher.

### Claim 9 (depends on 1)

The ink of claim 1, wherein the ink further comprises a water-dispersible resin, and an amount of the water-dispersible resin in the ink is 1% by mass to 15% by mass based on a solid content thereof.

### Claim 10 (depends on 1)

The ink of claim 1, wherein the ink further comprises at least one selected from the group consisting of a silicone-based surfactant and a fluorine-based surfactant.

### Claim 11 (depends on 1)

The ink of claim 1, wherein the colorant is at least one selected from the group consisting of phthalocyanine, quinacridon, disazo yellow, titanium dioxide, and carbon black.

### Claim 12 (depends on 4)

The inkjet recording method of claim 4, wherein a temperature in the heating is 50° C. to 200° C.

### Claim 13 (depends on 4)

The inkjet recording method of claim 4, wherein a size of droplets of the ink to be jetted is 3 pL to 40 pL, and a driving frequency is 1 kHz or higher.

### Claim 14

An inkjet recording device, comprising:
an ink jet unit configured to apply a stimulus to an ink to make the ink jet to thereby record an image; and
a heating unit configured to heat the image to fix the image on an image recording medium,
wherein the ink comprises:
water;
a colorant; and
an amide compound represented by the following structural formula (I):