Aqueous coloring agent dispersion for inkjet, ink composition, inkjet recording method, and colored body

Patent metadata

Field	Value
Publication number	US-2016160068-A1
Application number	US-201615045044-A
Country	US
Kind code	A1
Filing date	Feb 16, 2016
Priority date	Feb 2, 2012
Publication date	Jun 9, 2016
Grant date	—

Abstract

An inkjet aqueous pigment dispersion which achieves high pigment concentration, exhibits favorable redispersion properties after drying, and does not exhibit changes in ink properties even when stored for a long time; and an ink composition using the aqueous pigment dispersion. The inkjet aqueous pigment dispersion contains a pigment, a liquid medium, and a polymer dispersion agent which is an A-B block polymer obtained by copolymerization using a mixture of an organic tellurium compound represented by formula (1) and an organic ditellurium compound represented by formula (2) as a polymerization initiator. The monomer for configuring the A block is at least one type of monomer represented by formula (3), and the monomer for configuring the B block is benzyl methacrylate and/or benzyl acrylate.

First claim

What is claimed is:

1 . An aqueous coloring agent dispersion for inkjet comprising at least a coloring agent (I), a liquid medium (II), and a polymer dispersion agent (III),
wherein the polymer dispersion agent (III) is an A-B block polymer obtained by copolymerizing, via a living radical polymerization method, y using as a polymerization initiator any one of a mixture of an organic tellurium compound and an organic ditellurium compound, and a mixture of the organic tellurium compound, an azo-based polymerization initiator, and the organic ditellurium compound, wherein the organic tellurium compound is represented by the following formula (1):

wherein, R 1 represents a C 1 -C 8 alkyl group, an aryl group, a substituted aryl group, or an aromatic heterocyclic group; R 2 and R 3 represent a hydrogen atom or a C 1 -C 8 alkyl group; and R 4 represents an aryl group, a substituted aryl group, an aromatic heterocyclic group, an acyl group, an amide group, an oxycarbonyl group, or a cyano group, and
the organic ditellurium compound is represented by the following formula (2):
(R 1 Te) 2   (2)

wherein, R 1 has the same meaning as in the above formula wherein A and B are polymers obtained by polymerizing different monomers, and
the monomer for configuring the A block is two kinds of monomers represented by the following formula (3) in which R 5 is a hydrogen atom and R 6 is a methyl group and a monomer in which R 5 is an n-butyl group and R 6 is a methyl group:

and the monomer for configuring the B block is benzyl methacrylate and/or benzyl acrylate.

2 . The aqueous coloring agent dispersion for inkjet according to claim 1 , wherein an acid value of the polymer dispersion agent (III) is 90 to 200 mgKOH/g.

3 . The aqueous coloring agent dispersion for inkjet according to claim 1 , wherein a mass average molecular weight of the polymer dispersion agent (III) is 10,000 to 60,000.

4 . The aqueous coloring agent dispersion for inkjet according to claim 1 , wherein the coloring agent (I) is a pigment or a disperse dye.

5 . A method for producing the aqueous coloring agent dispersion for inkjet according to claim 1 , the method comprising a process of covering the surface of the coloring agent (I) with the polymer dispersion agent (III).

6 . An ink composition for inkjet recording comprising the aqueous coloring agent dispersion for inkjet according to claim 1 or an aqueous coloring agent dispersion for inkjet obtained by a method comprising covering the surface of the coloring agent (I) with the polymer dispersion agent (III).

7 . An inkjet recording method comprising utilizing the ink composition for inkjet recording according to claim 6 as an ink; and discharging ink droplets of the ink according to a recording signal so that recording is performed on a record-receiving material.

8 . The inkjet recording method according to claim 7 , wherein the record-receiving material is a communication sheet.

9 . The inkjet recording method according to claim 8 , wherein the communication sheet is a sheet having an ink-receiving layer containing a porous white inorganic material.

10 . The inkjet recording method according to claim 8 , wherein the communication sheet is a medium for recording which is subjected to a surface modification treatment selected from the group consisting of a corona discharge treatment, a plasma treatment and a flame treatment.

11 . A colored body colored with the ink composition for inkjet recording according to claim 6 .

12 . An inkjet printer loaded with a container containing the ink composition for inkjet recording according to claim 6 .

Assignees

• Nippon Kayaku Kk

Inventors

• Kawaguchi Akira
• Kuwahara Akio

Classifications

• C09D11/03

  characterised by features other than the chemical nature of the binder · CPC title

• C08K5/3417

  condensed with carbocyclic rings · CPC title

• C08F293/005

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title

• C08K5/3415

  Five-membered rings · CPC title