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Aqueous pigment dispersion and applications thereof

a pigment and dispersion technology, applied in the field of aqueous pigment dispersion, can solve the problems of hardly proceeding in general polymerization, high cost of polymer, and unable to meet the requirements of aqueous pigment, and achieves the effects of high microdispersibility, high dispersion stability, and easy dissolution in water

Inactive Publication Date: 2011-09-15
DAINICHISEIKA COLOR & CHEM MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]The high-molecular dispersant for use in the present invention has a diblock or triblock structure formed of one or two water-soluble polymer blocks and a water-insoluble polymer block. By treating a pigment with the block polymer, the water-insoluble polymer block or blocks coat pigment particles or deposit on pigment particles. Even in an aqueous medium, the high-molecular dispersant is not dissolved and remains coating the pigment to form a pigment-resin capsule structure. On the other hand, the water-soluble polymer block or blocks have hydrophilicity, thereby dispersing the encapsulated pigment in the aqueous medium and providing the pigment with high dispersion stability and high microdispersibility. Even if the dispersion dries up, the hydrophilic polymer block is readily dissolved in water. By simply bringing a dried product into contact with water, the pigment is hence allowed to readily disperse in water. The use of the aqueous pigment dispersion according to the present invention for the coloration of a product or article can afford a colored product or article having high vividness, a highly-developed color and a high gloss.
[0028]The process that obtains the high-molecular dispersant for use in the present invention is a novel living radical polymerization process, which is neither the conventional radical polymerization nor the above-described living radical polymerization process and is free of the problem of the heavy metal, smell, coloration, cost and the like in the above-described living, radical polymerization. The aqueous pigment dispersion according to the present invention is an aqueous pigment dispersion which can be obtained by treating a pigment with the above-described high-molecular dispersant and then dispersing the thus-treated pigment, and the aqueous pigment dispersion is very useful as a coloring agent for a water-based paint, gravure ink, stationery color, water-based inkjet ink, wet toner, chemical toner, water-based coating formulation, and the like.
[0029]The process that obtains the high-molecular dispersant for use in the present invention has the following merits:
[0030](1) No heavy metal compound is used; unlike the ATRP processor DT process, no heavy metal compound is used.
[0031](2) Purification is not essential; the ATRP process and DT process need the removal of a heavy metal, and the RAFT process and MADIX process need the removal of a sulfur compound.
[0032](3) No special and expensive compound is needed, a relatively economical material available on the market can be used, and therefore, the process is economical; the other living radical polymerization processes each require a special compound.

Problems solved by technology

However, the high-molecular dispersant obtained by the living radical polymerization is accompanied by the following problems resulted from the living radical polymerization.
Further, with this process, the polymerization of a methacrylate monomer hardly proceeds in general.
As the special nitroxide compound is expensive, the resulting polymer becomes costly.
Even with this method, there is a potential problem that the polymerization may terminate halfway.
With this process, it is hence not easy to introduce acid groups into the resulting polymer.
Further, the RAFT process or MADIX process requires to synthesize a special compound such as a dithiocarboxylate ester or xanthate compound, and therefore, is costly.
As this process uses the sulfur-containing compound, an unpleasant sulfur smell remains in the resulting polymer.

Method used

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  • Aqueous pigment dispersion and applications thereof
  • Aqueous pigment dispersion and applications thereof
  • Aqueous pigment dispersion and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of High-Molecular Dispersant-1

[0135]To a reactor composed of a 1-L separable flask fitted with a stirrer, reflux condenser, thermometer and nitrogen inlet tube, diethylene glycol dimethyl ether (hereinafter called “diglyme”) (241.5 parts), 2-iodo-2-cyanopropane (hereinafter called “CP-1”) (6.2 parts), methyl methacrylate (hereinafter abbreviated as “MMA”) (180 parts), acrylic acid (hereinafter abbreviated as “AA”) (14.4 parts), azobisisobutyronitrile (hereinafter abbreviated as “AIBN”) (5.2 parts), and iodosuccinimide (hereinafter abbreviated as “NIS”) (0.1 parts) were added, followed by stirring while allowing nitrogen to flow. The reaction temperature was raised to 75° C., at which polymerization was conducted for 3 hours.

[0136]Three hours later, a portion of the polymerization mixture was sampled, and its solid content was measured. As a result, the solid content was found to be 42.0%, and therefore, the monomers were confirmed to be polymerized substantially in their e...

synthesis examples 2 to 13

[0146]Solutions of block-polymer-type high-molecular dispersants-2 to -13 were prepared as in Synthesis Example 1, and are summarized in Tables 1 to 4. CP-1 was commonly used as an initiating compound. The use amount of CP-1 in each of Synthesis Examples 2 to 10 was the same as that in Synthesis Example 1, while the use amount of CP-1 in each of Synthesis Examples 11 to 13 was a half of its use amount in Synthesis Examples 2 to 10. When neutralized, the amount of the aqueous alkaline solution was a half of the amount of the organic solvent used in the polymerization. The abbreviations in Tables 1 to 4 have the following meanings.[0147](1) DPDM: dipropylene glycol dimethyl ether[0148](2) Diglyme: diethylene glycol dimethyl ether[0149](3) MMA: methyl methacrylate[0150](4) AIBN: azobisisobutyronitrile[0151](5) NIS: iodosuccinimide[0152](6) BzMA: benzyl methacrylate[0153](7) SI: succinimide[0154](8) IA: 2-t-butyl-4,6-dimethylphenol[0155](9) V-65: azobis(dimethylisovaleronitrile)[0156](1...

synthesis example 14

Synthesis of High-Molecular Dispersant-14

[0165]Using a similar reactor as in Synthesis Example 1, diglyme (227 parts), CP-1 (6.2 parts), MMA (84 parts), AA (13.7 parts), AIBN (5.2 parts), and NIS (0.45 parts) were combined, followed by stirring while allowing nitrogen to flow. The reaction temperature was raised to 75° C., at which polymerization was conducted for 3 hours. Three hours later, a portion of the polymerization mixture was sampled, and its solid content was measured. As a result, the solid content was found to be 19.2%, and therefore, the monomers were confirmed to be polymerized substantially in their entirety. Further, the molecular weight was measured by GPC. As a result, Mn was found to be 2,300, and PDI was found to be 1.38. The acid value of the polymer was 104.2 mgKOH / g.

[0166]To the polymerization system, a mixture of BzMA (70.4 parts) and AIBN (0.7 parts) was added, followed by polymerization at the same temperature for 3 hours. When its solid content was measure...

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Abstract

Disclosed are an aqueous pigment dispersion containing at least a pigment, water, a high-molecular dispersant, and an alkali. The high-molecular dispersant is a diblock polymer having a formula (1) of A-B or a triblock polymer having a formula (2) of A-B-C. The diblock or triblock polymer is a diblock or triblock polymer obtained by polymerizing addition-polymerizable monomers with a radical generator while using an organic iodide as a polymerization initiating compound and an organic phosphorus compound, organic nitrogen compound or organic oxygen compound as a catalyst. Also disclosed are a production method and use of the aqueous pigment dispersion. With the high-molecular dispersant obtained by a simple living radical polymerization process free of the problems of conventional living radical polymerization and having a precisely-controlled molecular structure, the aqueous pigment dispersion can be obtained with the pigment dispersed in it.

Description

TECHNICAL FIELD [0001]This invention relates to an aqueous pigment dispersion, which contains a pigment highly microdispersed therein, has good storage stability and gives printed images and characters of good quality. This invention is also concerned with a treated pigment, paint, ink, coating formulation, toner, stationery, and the like.BACKGROUND ART [0002]Keeping in step with the move toward colored products of higher performance, there has also been a conventional requirement in the market for high performance in the field of colorants (pigments and coloring agents), resulting in an outstanding demand for a novel pigment dispersion that has high color-developing ability and can afford a colored product having vividness, high durability and high transparency. With respect to pigment dispersants, on the other hand, there is also an outstanding demand for those excellent in various properties such as pigment dispersibility of dispersed pigment particles, the storage stability and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G9/00C09D153/00C09D133/10C09D7/62C09K23/52
CPCC08F293/005C08F2438/00C08K9/08C08L53/00C09B67/0066C09B67/009C09D7/1225C09D153/00C09D17/001C09D11/326C08L2666/02C09D7/62C08F297/00C09B67/0084C09K23/00
Inventor SHIMANAKA, HIROYUKIAOYAGI, TAIYOMURAKAMI, YOSHIKAZUYOSHIKAWA, SACHIOSAKAI, NAOYUKIGOTO, ATSUSHITSUJII, YOSHINOBUFUKUDA, TAKESHI
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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