# US 10,501,654 B2 · Pretreatment solution, ink set and method for producing printed matter

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- Number: US 10,501,654 B2
- Document ID: US10501654B2
- Status: Granted
- Kind: B2
- Application number: 16/069,882
- Filed: 2017-01-13
- Published: 2019-01-17
- Granted: 2019-12-10
- Earliest claimed: 2016-01-15
- Assignees: Toyo Ink Sc Holdings Co., Ltd.; Toyo Ink Co., Ltd.
- Applicants: Toyo Ink Sc Holdings Co., Ltd.; Toyo Ink Co., Ltd.
- Inventors: Mayuko Okamoto; Atsushi Yoda; Yoshihito Suzuki; Kazuhiro Jonai
- Web page: https://patentgrep.com/patent/US10501654B2

## CPC

- 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
- B41J 2/015: characterised by the jet generation process (B41J2/215 takes precedence)
- B41M 5/00: Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00})
- 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 5/0017: {Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying}
- B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)}
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing
- 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
- 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 pretreatment solution which is used together with an aqueous inkjet ink that contains at least a pigment, wherein the pretreatment solution contains an inorganic metal salt and/or an organic metal salt that exists in a dissolved state, and an organic solvent, the organic solvent contains a compound having one or more hydroxyl groups in each molecule, and the amount of the organic solvent is from 0.1 to 50% by weight based on the total weight of the pretreatment solution.

## Claims

### Claim 1

A pretreatment solution which is used together with an aqueous inkjet ink that comprises at least a pigment, wherein
the pretreatment solution comprises an inorganic metal salt and/or an organic metal salt, and an organic solvent,
the inorganic metal salt and/or the organic metal salt exists in a dissolved state in the pretreatment solution, and
the organic solvent contains a compound having one or more hydroxyl groups in each molecule, and an amount of the organic solvent, based on a total weight of the pretreatment solution, is from 0.1 to 50% by weight.

### Claim 2 (depends on 1)

The pretreatment solution according to claim 1, wherein
the inorganic metal salt and/or the organic metal salt is a polyvalent metal salt, and an amount of polyvalent metal ions derived from the polyvalent metal salt, based on a total weight of the pretreatment solution, is at least 2% by weight but not more than 8% by weight, and
based on a total weight of the pretreatment solution, an amount of an organic solvent having a boiling point of 180° C. or higher is not more than 15% by weight.

### Claim 3 (depends on 2)

The pretreatment solution according to claim 2, wherein the polyvalent metal ions comprise at least one ion selected from the group consisting of Ca2+, Mg2+, Zn2+, Al3+, Fe2+ and Fe3+.

### Claim 4 (depends on 1)

The pretreatment solution according to claim 1, further comprising a water-soluble binder resin.

### Claim 5 (depends on 4)

The pretreatment solution according to claim 4, wherein the water-soluble binder resin comprises a nonionic water-soluble resin.

### Claim 6 (depends on 4)

The pretreatment solution according to claim 4, wherein based on a total weight of the pretreatment solution, a weight ratio of an amount of the water-soluble binder resin relative to an amount of polyvalent metal ions derived from the inorganic metal salt and/or the organic metal salt is less than 20-fold.

### Claim 7 (depends on 1)

The pretreatment solution according to claim 1, wherein the pretreatment solution has a viscosity at 25° C. that is higher than 9 mPa·s but not more than 30 mPa·s.

### Claim 8 (depends on 1)

The pretreatment solution according to claim 1, wherein the pretreatment solution further comprises a surfactant, and has a surface tension at 25° C. of 20 to 45 mN/m.

### Claim 9 (depends on 1)

The pretreatment solution according to claim 1, wherein the pretreatment solution further comprises an organic amine in a dissolved state, and a difference between a pH of the aqueous inkjet ink and a pH of the pretreatment solution is not more than 2.

### Claim 10 (depends on 9)

The pretreatment solution according to claim 9, wherein the inorganic metal salt and/or the organic metal salt comprises a polyvalent metal salt, and an amount of polyvalent metal ions derived from the polyvalent metal salt, based on a total weight of the pretreatment solution, is at least 1% by weight but not more than 15% by weight.

### Claim 11 (depends on 9)

The pretreatment solution according to claim 9, wherein an amount of the organic amine, based on a total weight of the pretreatment solution, is at least 0.15% by weight but not more than 3% by weight.

### Claim 12 (depends on 9)

The pretreatment solution according to claim 9, wherein a weight average molecular weight of the organic amine is not more than 500, and the organic amine is a secondary amine and/or a tertiary amine.

### Claim 13 (depends on 9)

The pretreatment solution according to claim 9, wherein based on a total weight of the pretreatment solution, an amount of an organic solvent having a boiling point of 200° C. or higher is not more than 20% by weight.

### Claim 14 (depends on 9)

The pretreatment solution according to claim 9, wherein the pretreatment solution further comprises a water-soluble binder resin, and based on a total weight of the pretreatment solution, a weight ratio of an amount of the water-soluble binder resin relative to an amount of polyvalent metal ions derived from the inorganic metal salt and/or the organic metal salt is less than 50-fold.

### Claim 15 (depends on 14)

The pretreatment solution according to claim 14, wherein the water-soluble binder resin comprises a nonionic water-soluble resin.

### Claim 16 (depends on 14)

The pretreatment solution according to claim 14, wherein a number average molecular weight of the water-soluble binder resin is at least 3,000 but not more than 90,000.

### Claim 17 (depends on 1)

An ink set comprising the pretreatment solution according to claim 1, and an aqueous inkjet ink, wherein
the aqueous inkjet ink comprises a pigment, a water-soluble organic solvent and water, and
the water-soluble organic solvent comprises two or more solvents selected from the group consisting of glycol ether-based solvents and alkyl polyol-based solvents having a boiling point at 1 atmosphere of at least 180° C. but not more than 280° C.

### Claim 18 (depends on 17)

The ink set according to claim 17, wherein based on a total weight of the aqueous inkjet ink, an amount of a water-soluble organic solvent having a boiling point at 1 atmosphere of at least 240° C. is less than 10% by weight.

### Claim 19 (depends on 17)

The ink set according to claim 17, wherein the aqueous inkjet ink further comprises a water-soluble resin as a binder resin.

### Claim 20 (depends on 17)

The ink set according to claim 17, wherein the aqueous inkjet ink has at least a magenta ink, and the magenta ink comprises C.I. Pigment Violet 19 as a magenta pigment.