Pretreatment liquid and ink set comprising same

Patent metadata

Field	Value
Publication number	US-11352518-B2
Application number	US-201716482619-A
Country	US
Kind code	B2
Filing date	Nov 20, 2017
Priority date	Feb 1, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Provided is a pretreatment liquid for aqueous pigment inkjet printing which excels in adhesion to non-permeable substrates such as film substrates and which can provide printed material having good printed image quality with little mixed color bleeding and color unevenness. Also provided is an ink set including the pretreatment liquid and an aqueous pigment inkjet ink. The pretreatment liquid for aqueous pigment inkjet ink printing comprises polyolefin resin particles (A), a flocculant (B), and water. The softening temperature of the polyolefin resin particles (A) is from 50 to 100° C., and the flocculant (B) contains at least one type of substance selected from metal salts and cationic polymer compounds.

First claim

The invention claimed is:

1. A pretreatment liquid for aqueous pigment inkjet ink printing, the pretreatment liquid comprising:
polyolefin resin particles (A), a flocculant (B), and water; wherein
the polyolefin resin particles (A) comprise a polyolefin resin modified by a functional group containing an oxygen atom,
a softening temperature of the polyolefin resin particles (A) is from 50 to 100° C.; and
the flocculant (B) contains at least one type of substance selected from the group consisting of metal salts and cationic polymer compounds, wherein the polyolefin resin particles (A) have an acid value of from 1 to 200 mg KOH/g.

2. The pretreatment liquid according to claim 1 , wherein a 50% particle size (D50) of the polyolefin resin particles (A) is from 10 to 500 nm.

3. The pretreatment liquid according to claim 1 , wherein the pretreatment liquid further comprises a protic organic solvent, and a weighted average of the boiling point of the protic organic solvent and the boiling point of the water is from 90 to 130° C.

4. The pretreatment liquid according to claim 1 , wherein the pretreatment liquid has a surface tension of from 20 to 40 mN/m.

5. The pretreatment liquid according to claim 1 , wherein the pretreatment liquid is used for a film substrate.

6. An ink set comprising:
a pretreatment liquid according to claim 1 ; and
an aqueous pigment inkjet ink containing a pigment, a pigment-dispersing resin, a water-soluble organic solvent, and water; wherein
an acid value of the pigment-dispersing resin is from 30 to 375 mg KOH/g.

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyocolor Co Ltd

Inventors

• Sugihara Masahiro
• TETSUKA Toshihiro
• Hattori Kazumasa

Classifications

• C09D11/322

  Pigment inks · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title

• B41M5/00

  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}) · CPC title

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• C09D11/54 Primary

  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 · CPC title