Ink for inkjet recording, ink container, and inkjet recording device

Patent metadata

Field	Value
Publication number	US-9441129-B2
Application number	US-201514634054-A
Country	US
Kind code	B2
Filing date	Feb 27, 2015
Priority date	Mar 12, 2014
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

An ink for inkjet recording contains water, an organic solvent, a pigment, and a compound represented by the following Chemical formula 1:

In Chemical formula 1, M + 's each, independently represent protons, cations of alkali metals, ammonium ions, or organic ammonium ions.

First claim

What is claimed is:

1. An ink for inkjet recording comprising:
water;
an organic solvent;
a pigment; and
a compound represented by the following Chemical formula 1:

where M + 's each, independently represent protons, cations of alkali metals, ammonium ions, or organic ammonium ions,
wherein the pigment satisfies one of the following I to III:
I. the pigment which is dispersed by a dispersant having one or more kinds of hydrophilic group;
II. the pigment which is covered with a resin having one or more kinds of hydrophilic group; and
III. the pigment to which one or more kinds of hydrophilic group, an atomic group having one or more kinds of hydrophilic group, or a resin having one or more kinds of hydrophilic group is bonded, and

wherein the pH of the ink for inkjet recording ranges from 7.0 to 10.0 at 25° C.

2. The ink for inkjet recording according to claim 1 , wherein the hydrophilic group is a phosphoric acid group or a phosphonic acid group.

3. The ink for inkjet recording according to claim 1 , wherein the hydrophilic group is a bisphosphonic acid group.

4. The ink for inkjet recording according to claim 1 , wherein M + in Chemical formula 1 is a proton or an organic ammonium ion.

5. The ink for inkjet recording according to claim 1 , wherein the compound represented by Chemical formula 1 accounts for 0.1% by weight to 15.0% by weight in the ink for ink for inkjet recording.

6. An ink container comprising:
an ink accommodating unit to accommodate the ink for inkjet recording of claim 1 .

7. An inkjet recording device comprising:
the ink container of claim 6 .

Assignees

• Katoh Keita
• Naruse Mitsuru
• Nonogaki Masayasu
• Matsuyama Akihiko
• Nagai Kazukiyo
• Koizuka Yuusuke
• Ricoh Co Ltd

Inventors

• Katoh Keita
• Naruse Mitsuru
• Nonogaki Masayasu
• Matsuyama Akihiko
• Nagai Kazukiyo
• Koizuka Yuusuke

Classifications

• B41J2/17523

  Ink connection · CPC title

• C09D11/322

  Pigment inks · CPC title

• B41J2/2107

  characterised by the ink properties (supplying ink in a solid state B41J2/17593) · CPC title

• B41J2/175

  Ink supply systems {; Circuit parts therefor} · CPC title

• B41J29/02

  Framework · CPC title