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

Inactive Publication Date: 2014-12-11
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an aqueous coloring agent dispersion for inkjet and an ink composition containing this dispersion. The advantages of this invention include good storage stability, high print density, and favorable redispersion properties. This invention is suitable for use in inkjet printing and results in high quality images on both inkjet exclusive paper and general purpose plain paper. Overall, this invention provides an effective solution for inkjet printing.

Problems solved by technology

Such a record-receiving material does not actively include an absorbing layer and it is difficult to impregnate the ink into the record-receiving material.
Therefore, drying takes a long time.
For example, in the case of high-speed automatic duplex printing in which second-face printing is carried out by instantaneously reversing a piece of paper after the first side has been printed in an inkjet recording device, a problem of contamination of reversing rollers due to undried ink may occur.
Furthermore, when a concentration of the coloring agent in the ink composition is increased in order to increase image density, it is known that the stability of the ink deteriorates.
Furthermore, due to drying in the vicinity of a nozzle, the coloring agent is deposited and thus the nozzle may be clogged with the coloring agent in some cases.
However, since the pigment is insoluble in water, there is a defect in that, if the pigment is dried once and then agglomerated, the pigment cannot be dispersed again in water, which is likely to result in a problem.
Accordingly, a concentration gradient occurs in the ink and thus there is a problem in that initial printing characteristics cannot be obtained, or, in the worst case, there is a problem in that agglomerated particles are clogged at a nozzle and thus cannot be discharged.
However, all ink compositions have not been provided as a product sufficiently satisfying a need in the market yet.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of Ethyl-2-Methyl-2-n-Butyltellanyl-Propionate (Hereinafter, Referred to as “BTEE”)

[0167]6.38 g (50 mmol) of metal tellurium (trade name: Tellurium (−40 mesh), manufactured by Aldrich Corporation) was suspended in 50 ml of THF. 34.4 mL (55 mmol) of n-butyllithium (manufactured by Aldrich Corporation, 1.6 M hexane solution) were gradually added dropwise to the obtained suspension at room temperature (for 10 minutes). The obtained reaction solution was stirred until the metal tellurium was completely dissolved (for 20 minutes). Next, 10.7 g (55 mmol) of ethyl-2-bromo-isobutyrate were added at room temperature and stirred for 2 hours. After completion of the reaction, the solvent was concentrated under reduced pressure, and subsequently, was distilled under reduced pressure, thereby obtaining 8.98 g (yield: 59.5%) of a yellow oily substance of BTEE.

synthesis example 2

Synthesis of Dibutyl Ditelluride (Hereinafter, Referred to as “DBDT”)

[0168]3.19 g (25 mmol) of metal tellurium (trade name: Tellurium (−40 mesh), manufactured by Aldrich Corporation) was suspended in 25 ml of THF. 17.2 mL (27.5 mmol) of n-butyllithium (manufactured by Aldrich Corporation, 1.6 M hexane solution) were gradually added dropwise to the obtained suspension at 0° C. (for 10 minutes). The obtained reaction solution was stirred until the metal tellurium was completely dissolved (for 10 minutes). Next, 20 mL of ammonium chloride solution were added at room temperature and stirred for 1 hour. After completion of the reaction, the organic layer was separated and the water layer was extracted 3 times with diethyl ether. The collected organic layer was dried with anhydrous sodium sulfate and then concentrated under reduced pressure, thereby obtaining 4.41 g (11.93 mmol; yield: 95%) of a grape oily substance of DBDT.

(B) Preparation of Block Copolymer

synthesis example 3

Synthesis of Block Copolymer A

[0169]In a nitrogen-replaced glove box, 90 g (511 mmol) of benzyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.), 2.00 g (6.67 mmol) of BTEE, 1.22 g (3.33 mmol) of DBDT, 0.33 g (2.00 mmol) of 2,2′-azobis-isobutyronitrile (trade name: AIBN, manufactured by Otsuka Chemical Co., Ltd., hereinafter referred to as “AIBN”), and 90 g of methoxypropanol were charged into a flask equipped with a stirrer, and then reacted at 60° C. for 16 hours. The polymerization rate was 99.6%, the Mw was 16,200, and the PDI was 1.41.

[0170]45 g (317 mmol) of butyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.), 25 g (290 mmol) of methacrylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.), 0.22 g (1.33 mmol) of AIBN, and 70 g of methoxypropanol were added to the obtained solution, and then reacted at 60° C. for 22 hours. The polymerization rate was 99.1%.

[0171]After completion of the reaction, the reaction solution was poured into 5 L...

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Abstract

Provided are an aqueous coloring agent dispersion for inkjet 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 coloring agent dispersion. This aqueous coloring agent dispersion contains a coloring agent (I), a liquid medium (II), and a polymer dispersion agent (III). The polymer dispersion agent (III) is an A-B block polymer obtained by copolymerizing via a living radical polymerization method, by using a mixture of an organic tellurium compound represented by formula (1) and an organic ditellurium compound represented by formula (2), or the like, as a polymerization initiator. Therein, 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.

Description

TECHNICAL FIELD[0001]The present invention relates to an aqueous coloring agent dispersion for inkjet containing at least a coloring agent (I), a liquid medium (II), and a polymer dispersion agent (III), an ink composition containing the aqueous coloring agent dispersion, an inkjet recording method using the ink composition, and a colored body.BACKGROUND ART[0002]A recording method using an inkjet printer, which is a representative method among various color recording methods, is for performing recording by generating small ink droplets and attaching the ink droplets to a variety of record-receiving materials (paper, film, cloth, and the like). In this method, since the recording head is not brought into direct contact with the record-receiving material, less noise is generated and silent recording is achieved. In addition, since features of reduced size and increased speed are readily achievable, the inkjet recording method has been rapidly popularized in recent years. Accordingly,...

Claims

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Application Information

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IPC IPC(8): C09D11/322C08K5/23C08K5/3437C08K5/3417C08K5/3415C08K3/04
CPCC09D11/322C08K5/3415C08K5/235C08K5/3437C08K5/3417C08K3/04C09D11/326C09D11/107C08F293/005C08F2438/00Y10T428/24901Y10T428/24802C09D11/03C09D11/30C09D17/001
Inventor KAWAGUCHI, AKIRAKUWAHARA, AKIO
Owner NIPPON KAYAKU CO LTD
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