Aqueous inkjet ink composition

Patent metadata

Field	Value
Publication number	US-9296908-B2
Application number	US-201113699965-A
Country	US
Kind code	B2
Filing date	May 26, 2011
Priority date	May 26, 2010
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

An aqueous inkjet ink composition comprising a pigment, a pigment-dispersing resin, resin fine particles (A), water, and hydrophilic solvents (B), the resin fine particles (A) being formed by emulsion polymerizing ethylenically unsaturated monomers including: 20% to 80% by weight of an aromatic ethylenically unsaturated monomer (C) that does not have an ionic functional group; 0.6% to 6% by weight of water-soluble ethylenically unsaturated monomers (F) consisting of 0.5% to 3% by weight of a sulfonic acid group-containing ethylenically unsaturated monomer (D) and 0.1% to 3% by weight of a nonionic water-soluble ethylenically unsaturated monomer (E); and 0.1% to 10% by weight of a crosslinkable ethylenically unsaturated monomer (G), and the hydrophilic solvents (B) including a glycol-based solvent (H) and an ethylene glycol ether-based solvent (I) is provided.

First claim

The invention claimed is:

1. An aqueous inkjet ink composition comprising a pigment, a pigment-dispersing resin, resin fine particles (A), water, and hydrophilic solvents (B),
wherein the resin fine particles (A) is formed by emulsion polymerizing ethylenically unsaturated monomers including:
20% to 80% by weight of an aromatic ethylenically unsaturated monomer (C) that does not have an ionic functional group;
0.6% to 6% by weight of water-soluble ethylenically unsaturated monomers (F) consisting of 0.5% to 3% by weight of a sulfonic acid group-containing ethylenically unsaturated monomer (D) and 0.1% to 3% by weight of a nonionic water-soluble ethylenically unsaturated monomer (E), wherein the sulfonic acid group-containing ethylenically unsaturated monomer (D) is a styrenesulfonic acid group-containing ethylenically unsaturated monomer; and
0.1% to 10% by weight of a crosslinkable ethylenically unsaturated monomer (G), wherein the crosslinkable ethylenically unsaturated monomer (G) is a monomer having two or more allyl groups,
wherein an average particle size of the resin fine particles (A) is from 73 nm to 250 nm, and the amount of coarse particles having a particle size of 1 μm or greater in an aqueous dispersion of the resin fine particles (A) at a solid concentration of 30 ppm is 4×10 4 particles/cm 3 or less, and
wherein the hydrophilic solvents (B) include a glycol-based solvent (H) and an ethylene glycol ether-based solvent (I).

2. The aqueous inkjet ink composition according to claim 1 , wherein the average particle size of the resin fine particles (A) is from 86 nm to 250 nm.

3. The aqueous inkjet ink composition according to claim 1 , wherein a glass transition temperature of the resin fine particles (A) is 40° C. to 120° C.

4. The aqueous inkjet ink composition according to claim 1 , wherein a viscosity of an aqueous dispersion of the resin fine particles (A) measured under conditions of a temperature of 25° C. and a solid concentration of 40% by weight is 5 mPa·s to 200 mPa·s.

5. The aqueous inkjet ink composition according to claim 1 , wherein the average particle size of the resin fine particles (A) is from 100 nm to 250 nm.

Assignees

• Koike Takaaki
• Kinoshita Sachiko
• Sakai Yoshiyuki
• Nishina Akiko
• Utsugi Masayoshi
• Takahashi Yukitoshi
• Yoda Atsushi
• Sugihara Masahiro
• Toyo Ink Sc Holdings Co Ltd
• Toyo Ink Co Ltd

Inventors

• Koike Takaaki
• Kinoshita Sachiko
• Sakai Yoshiyuki
• Nishina Akiko
• Utsugi Masayoshi
• Takahashi Yukitoshi
• Yoda Atsushi
• Sugihara Masahiro

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/30 Primary

  Inkjet printing inks · CPC title

• C09D11/106

  containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title