# US 12,005,726 B2 · Ink jet recording method and ink jet recording apparatus

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- Number: US 12,005,726 B2
- Document ID: US12005726B2
- Status: Granted
- Kind: B2
- Application number: 17/903,257
- Filed: 2022-09-06
- Published: 2023-03-16
- Granted: 2024-06-11
- Earliest claimed: 2021-09-09
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Eiichi Nakata; Eriko Yoshino; Ryo Tsujii; Yoshitaka Torisaka; Masanori Yoshida
- Web page: https://patentgrep.com/patent/US12005726B2

## CPC

- B41M 7/009: {using thermal means, e.g. infrared radiation, heat}
- C09D 11/104: Polyesters
- C09D 11/106: containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D 11/322: Pigment inks
- B41J 11/00216: {using infrared [IR] radiation or microwaves}
- B41M 5/0011: {Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating (after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015)}
- B41M 5/50: Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording {(printing on organic plastics using a printer's form B41M1/30; printing on pre-treated paper with a printer's form B41M1/36)}
- B41M 5/52: Macromolecular coatings
- C09D 11/12: based on waxes or bitumen
- 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)
- 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

The ink jet recording method includes ejecting an aqueous ink from a recording head to apply the aqueous ink to a recording medium, to thereby record an image. The ink jet recording method includes: ejecting the aqueous ink heated to a temperature TH (° C.) from the recording head to apply the aqueous ink to the recording medium; and heating the recording medium having the aqueous ink applied thereto to a temperature TF (° C.), the aqueous ink containing a pigment and a polyester resin particle, a glass transition temperature TG (° C.) of the polyester resin particle, the temperature TH (° C.) and the temperature TF (° C.) satisfying relationships of the following expressions (1) to (3). TG(° C.)>TH(° C.) (1) TF(° C.)≥TH(° C.)+10° C. (2) TF(° C.)≥TG(° C.)−10° C. (3)

## Claims

### Claim 1

An ink jet recording method including ejecting an aqueous ink from a recording head of an ink jet system through action of thermal energy to apply the aqueous ink to a recording medium, to thereby record an image,
the ink jet recording method comprising:
ejecting the aqueous ink heated to a temperature TH (° C.) from the recording head to apply the aqueous ink to the recording medium; and
heating the recording medium having the aqueous ink applied thereto to a temperature TF (° C.),
the aqueous ink containing a pigment and a polyester resin particle,
the polyester resin particle having a ratio of a weight average molecular weight to a number average molecular weight of 6.0 or less,
a glass transition temperature TG (° C.) of the polyester resin particle, the temperature TH (° C.) and the temperature TF (° C.) satisfying relationships of the following expressions (1) to (3),
a heat quantity ((W·h)/g) to be applied to the aqueous ink applied to the recording medium being 2 (W·h)/g or more,
the recording medium having a water absorption amount of 10 mL/m2 or less in a Bristow method from start of contact to 30 msec1/2.
TG(° C.)>TH(° C.) (1)
TF(° C.)≥TH(° C.)+10° C. (2)
TF(° C.)≥TG(° C.)−10° C. (3)

### Claim 2 (depends on 1)

The ink jet recording method according to claim 1,
wherein the temperature TH (° C.) is 40° C. or more, and
wherein the temperature TF (° C.) is 90° C. or less.

### Claim 3 (depends on 1)

The ink jet recording method according to claim 1,
wherein the aqueous ink further contains a first water-soluble organic solvent having a boiling point of from 120° C. or more to 220° C. or less, and
wherein the first water-soluble organic solvent has a largest content by mass) among all water-soluble organic solvents in the aqueous ink.

### Claim 4 (depends on 3)

The ink jet recording method according to claim 3,
wherein a difference between an SP value of the first water-soluble organic solvent and an SP value of the polyester resin particle is 4.0 or less, and
wherein the content (% by mass) of the first water-soluble organic solvent in the aqueous ink is from 1.0 times or more to 4.0 times or less in terms of mass ratio with respect to a content (% by mass) of the polyester resin particle.

### Claim 5 (depends on 1)

The ink jet recording method according to claim 1,
wherein the aqueous ink further contains a second water-soluble organic solvent having a boiling point of from more than 220° C. to 310° C. or less, and
wherein a difference between an SP value of the second water-soluble organic solvent and an SP value of the polyester resin particle is 4.0 or less.

### Claim 6 (depends on 1)

The ink jet recording method according to claim 1,
wherein the pigment is dispersed in the aqueous ink through action of an anionic group, and
wherein an anionic group amount (μmol/g) of the pigment is 6.0 times or more in terms of ratio with respect to an anionic group amount (μmol/g) of the polyester resin particle.

### Claim 7 (depends on 1)

The ink jet recording method according to claim 1, wherein the weight average molecular weight of the polyester resin particle is from 30,000 or more to 70,000 or less.

### Claim 8 (depends on 1)

The ink jet recording method according to claim 1, wherein a content (% by mass) of the polyester resin particle in the aqueous ink is 1.5 times or more in terms of mass ratio with respect to a content (% by mass) of the pigment.

### Claim 9 (depends on 1)

The ink jet recording method according to claim 1,
wherein the aqueous ink further contains a wax particle formed of at least one kind of wax selected from the group consisting of: a Fischer-Tropsch wax; a polyolefin wax; and an α-olefin/maleic anhydride copolymer, and
wherein a content (% by mass) of the polyester resin particle in the aqueous ink is from 2.0 times or more to 30.0 times or less in terms of mass ratio with respect to a content (% by mass) of the wax particle.

### Claim 10

An ink jet recording apparatus to be used in an ink jet recording method including ejecting an aqueous ink from a recording head of an ink jet system through action of thermal energy to apply the aqueous ink to a recording medium, to thereby record an image,
the ink jet recording apparatus comprising:
a mechanism configured to heat the aqueous ink to be ejected from the recording head and applied to the recording medium to a temperature TH (° C.); and
a mechanism configured to heat the recording medium having the aqueous ink applied thereto to a temperature TF (° C.),
the aqueous ink containing a pigment and a polyester resin particle,
the polyester resin particle having a ratio of a weight average molecular weight to a number average molecular weight of 6.0 or less,
a glass transition temperature TG (° C.) of the polyester resin particle, the temperature TH (° C.) and the temperature TF (° C.) satisfying relationships of the following expressions (1) to (3),
a heat quantity (W·h)/g) to be applied to the aqueous ink applied to the recording medium being 2 (W·h)/g or more,
the recording medium having a water absorption amount of 10 mL/m2 or less in a Bristow method from start of contact to 30 msec1/2.
TG(° C.)>TH(° C.) (1)
TF(° C.)≥TH(° C.)+10° C. (2)
TF(° C.)≥TG(° C.)−10° C. (3)