# US 2013/0155145 A1 · Image forming method

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- Number: US 2013/0155145 A1
- Document ID: US20130155145A1
- Status: Published application
- Kind: A1
- Application number: 13/680,386
- Filed: 2012-11-19
- Published: 2013-06-20
- Earliest claimed: 2011-12-14
- Assignees: Ricoh Company, Ltd.
- Inventors: Hiroshi GOTOU; Hidetoshi FUJII; Yuuki YOKOHAMA
- Web page: https://patentgrep.com/patent/US20130155145A1

## CPC

- B41J 2/015: characterised by the jet generation process (B41J2/215 takes precedence)
- C09D 11/322: Pigment inks
- C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing
- 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
- 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}
- 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)
- 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

An image forming method applying a pretreatment liquid on the surface of a recording medium; and applying an inkjet ink including a colorant, a hydrosoluble organic solvent, a surfactant and water on the surface applied with the pretreatment liquid, wherein the hydrosoluble organic solvent includes at least one polyol including an equilibrium water content in an amount not less than 30% by weight at 23° C. and 80% RH; an amide compound having the following formula (I); and at least one of compounds having the following formulae (II) to (IV), and wherein a pure water transfers to the recording medium in an amount of from 1 to 15 mL/m2 when measured by a dynamic scanning liquid absorptometer at a contact time of 100 ms.

## Claims

### Claim 1

An image forming method, comprising:
applying a pretreatment liquid on the surface of a recording medium; and
applying an inkjet ink comprising a colorant, a hydrosoluble organic solvent, a surfactant and water on the surface applied with the pretreatment liquid,
wherein the hydrosoluble organic solvent comprises:
at least one polyol comprising an equilibrium water content in an amount not less than 30% by weight at 23° C. and 80% RH;
an amide compound having the following formula (I); and
at least one of compounds having the following formulae (II) to (IV),
wherein R represents an alkyl group having 4 to 6 carbon atoms,
wherein R1 represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and R2 represents an alkyl group having 1 to 4 carbon atoms,
wherein R′ represents an alkyl group having 1 to 2 carbon atoms; and R3 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cyclic alkyl groups or an aromatic ring, and
wherein R4 and R5 represent an alkyl group having 1 to 8 carbon atoms, respectively, and
wherein a pure water transfers to the recording medium in an amount of from 1 to 15 mL/m2 when measured by a dynamic scanning liquid absorptometer at a contact time of 100 ms.

### Claim 2 (depends on 1)

The image forming method of claim 1, wherein the hydrosoluble organic solvent further comprises an amino compound having the following formula (I-2):

### Claim 3 (depends on 1)

The image forming method of claim 1, wherein the pretreatment liquid comprises at least one hydrosoluble aliphatic organic acid selected from the group consisting of compounds having the following formula (V):
wherein R6 represents a hydrogen atom or a methyl group substituted by a carboxyl group; and R7 represents a methyl group, a methyl group substituted by a carboxyl group, or a methyl group substituted by a hydroxyl group and a carboxyl group.

### Claim 4 (depends on 3)

The image forming method of claim 3, wherein the pretreatment liquid further comprises a hydrosoluble organic monoamine compound.

### Claim 5 (depends on 4)

The image forming method of claim 4, wherein the hydrosoluble organic monoamine compound is a member selected from the group consisting of compounds having the formula (VI) or (VII):
wherein R8, R9, and R10 independently represent a hydrogen atom, an alkoxy group having 1 to 4 carbon atoms, an alkyl group having 1 to 8 carbon atoms, a hydroxyethyl group or a hydroxypropyl group, excluding a case where all of R8, R9, and R10 are hydrogen atoms.
wherein R11 represents a hydroxymethyl group; R12 represents a methyl group, an ethyl group or a hydroxymethyl group; and R13 denotes a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a hydroxymethyl group.

### Claim 6 (depends on 1)

The image forming method of claim 1, wherein the pretreatment liquid further comprises at least one of ammonium lactate and a hydrosoluble cationic polymer.

### Claim 7 (depends on 6)

The image forming method of claim 6, wherein the hydrosoluble cationic polymer is a member selected from the group consisting of copolymers having the following formula (VIII), copolymers having a repeating unit having the following formula (IX), and copolymers obtained by polymerizing an amine monomer having the following formula (X), a monomer having the following formula (XI) and a monomer having the following formula (XII):
wherein R14 to R21 may be identical to or different from each other, and each represents at least one of an alkyl group having 1 to 8 carbon atoms, a hydroxyalkyl group, an alkenyl group, and a benzyl group; X represents a halogen atom; and n represents an integer of from 1 o to 4.
wherein X represents a halogen atom and m represents an integer of 1 or more.
wherein X represents a halogen atom.

### Claim 8 (depends on 1)

The image forming method of claim 1, wherein the colorant is at least one pigment selected from the group consisting of anionic self-dispersible pigments, pigments coated with an anionic resin and aqueous pigments dispersed with an anionic dispersant or a nonionic dispersant.

### Claim 9 (depends on 1)

The image forming method of claim 1, wherein the recording medium comprises:
a substrate; and
a layer coated on at least one side of the substrate,
wherein a pure water transfers to the layer in an amount of from 1 to 15 mL/m2 when measured by a dynamic scanning liquid absorptometer at a contact time of 100 ms.