Pretreatment liquid and ink set

Patent metadata

Field	Value
Publication number	US-11512216-B2
Application number	US-201816322110-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Dec 25, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A pretreatment liquid that is used together with an aqueous inkjet ink containing a pigment and water, wherein the pretreatment liquid contains resin microparticles (A), a surfactant (B), a coagulant (C) and water, the surfactant (B) contains a polyoxyalkylene alkyl ether (b-1), and the coagulant (C) contains a polyvalent metal salt and/or a cationic polymer compound and has a water absorptivity at a temperature of 40° C. and a relative humidity of 80% of 75% by mass or less.

First claim

The invention claimed is:

1. An ink set comprising:
a pretreatment liquid comprising resin microparticles (A), a surfactant (B), a coagulant (C) and water; and
an aqueous inkjet ink comprising a pigment, a water-soluble organic solvent and water,
wherein the surfactant (B) comprises a polyoxyalkylene alkyl ether (b-1) represented by a general formula (1) shown below,
the coagulant (C) comprises a polyvalent metal salt and/or a cationic polymer compound, and
the coagulant (C) has a water absorptivity at a relative humidity of 80% of 75% by mass or less:
R—O-(EO) m -(PO) n —H  General formula (1)

wherein R represents an alkyl group of 8 to 22 carbon atoms, an alkenyl group of 8 to 22 carbon atoms, an alkylcarbonyl group of 8 to 22 carbon atoms, or an alkenylcarbonyl group of 8 to 22 carbon atoms,
EO represents an ethylene oxide group and PO represents a propylene oxide group,
m represents an average number of added moles of EO and is a number from 8 to 100,
n represents an average number of added moles of PO, and is a number from 0 to 99, provided that m>n, and
when n is not 0, there are no restrictions on an addition sequence of (EO) m and (PO) n , and the addition may be in blocks or may be random.

2. The ink set according to claim 1 , wherein a blend amount of the polyoxyalkylene alkyl ether (b-1) is from 5 to 50% by mass relative to a blend amount of the resin microparticles (A).

3. The ink set according to claim 1 , wherein the coagulant (C) comprises a divalent metal salt.

4. The ink set according to claim 1 , wherein the resin microparticles (A) comprise two or more types of resin microparticles selected from the group consisting of polyurethane resins, polyurethane polyurea resins, (meth)acrylic resins, acrylic-modified polyurethane resins, and polyolefin resins.

5. The ink set according to claim 1 , wherein the pretreatment liquid is used on a thermoplastic resin substrate.

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyocolor Co Ltd

Inventors

• Sugihara Masahiro
• Sasaki Yuki
• TETSUKA Toshihiro
• Koike Takaaki
• Imazato Akiko
• Kikuta Naoya
• Tanabe Tomoe

Classifications

• B41M5/502

  characterised by structural details, e.g. multilayer materials (supports, backcoats or intermediate layers for thermal dye transfer donor and receiver sheets B41M5/41, B41M5/42) · CPC title

• C09D11/54

  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 · CPC title

• B41M5/5227

  characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants · CPC title

• B41M5/5218

  characterised by inorganic additives, e.g. pigments, clays · CPC title

• C09D11/322

  Pigment inks · CPC title