# US 10,479,103 B2 · Aqueous ink composition and ink jet recording apparatus

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- Number: US 10,479,103 B2
- Document ID: US10479103B2
- Status: Granted
- Kind: B2
- Application number: 15/915,372
- Filed: 2018-03-08
- Published: 2018-09-27
- Granted: 2019-11-19
- Earliest claimed: 2017-03-27
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Keiji Iida; Tomohito Nakano; Keisuke Morita
- Web page: https://patentgrep.com/patent/US10479103B2

## CPC

- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- B41J 2/01: Ink jet
- C09D 11/033: characterised by the solvent
- C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
- C09D 11/30: Inkjet printing inks
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- 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)

## Abstract

An aqueous ink composition contains: an alkanediol having a normal boiling point of 240° C. or higher; polyoxyethylene mono(2-ethylhexyl) ether having a carbon number of 14 or more and 22 or less; and water, in which a content of the polyoxyethylene mono(2-ethylhexyl) ether having a carbon number of 14 or more and 22 or less is 0.4% by mass or lower based on the total amount of the aqueous ink composition.

## Claims

### Claim 1

An aqueous ink composition comprising:
an alkanediol having a normal boiling point of 240° C. or higher;
polyoxyethylene mono(2-ethylhexyl) ether having a carbon number of 14 or more and 22 or less; and
water, wherein
a content of the polyoxyethylene mono(2-ethylhexyl) ether having a carbon number of 14 or more and 22 or less is in a range of 0.01% to 0.4% by mass based on a total amount of the aqueous ink composition.

### Claim 2 (depends on 1)

The aqueous ink composition according to claim 1, further comprising a calcium ion.

### Claim 3 (depends on 1)

The aqueous ink composition according to claim 1, further comprising diethylene glycol mono(2-ethylhexyl) ether.

### Claim 4 (depends on 1)

The aqueous ink composition according to claim 1, wherein
a content of the alkanediol having a normal boiling point of 240° C. or higher is 3% by mass or higher and 15% by mass or lower based on the total amount of the aqueous ink composition.

### Claim 5 (depends on 3)

The aqueous ink composition according to claim 3, wherein
a content of the diethylene glycol mono(2-ethylhexyl) ether is 0.1% by mass or higher and 0.5% by mass or lower based on the total amount of the aqueous ink composition.

### Claim 6 (depends on 1)

The aqueous ink composition according to claim 1, wherein
the aqueous ink composition does not contain more than 0.5% by mass of an organic solvent having a normal boiling point of lower than 240° C., based on the total amount of the aqueous ink composition.

### Claim 7 (depends on 1)

The aqueous ink composition according to claim 1, wherein
a carbon number of the alkanediol is 8 or less.

### Claim 8 (depends on 1)

The aqueous ink composition according to claim 1, wherein
the carbon number of the polyoxyethylene mono(2-ethylhexyl) ether is 16 or more and 20 or less.

### Claim 9 (depends on 1)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 1.

### Claim 10 (depends on 2)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 2.

### Claim 11 (depends on 3)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 3.

### Claim 12 (depends on 4)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 4.

### Claim 13 (depends on 5)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 5.

### Claim 14 (depends on 6)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 6.

### Claim 15 (depends on 7)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 7.

### Claim 16 (depends on 8)

An ink jet recording apparatus comprising a head that discharges the aqueous ink composition according to claim 8.

### Claim 17 (depends on 2)

The aqueous ink composition according to claim 2, wherein an amount of the calcium ion is in a range of 1-80 ppm.

### Claim 18 (depends on 1)

The aqueous ink composition according to claim 1, wherein the aqueous ink composition does not contain an organic solvent having a normal boiling point that is less than 240° C.