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Pigment, method for producing pigment, pigment dispersion, method for producing pigment dispersion, recording ink, recording method, and recorded image

A dispersion and dispersion technology, applied in the direction of pigment slurry, copy/marking method, ink, etc., can solve the problems of uneven color of recorded image, deviation of color rendering of pigment dispersion, instability, etc., and achieve good color rendering, Good weather resistance and improved storage stability

Inactive Publication Date: 2007-08-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is, for the pigment that is provided by existing preparation method, pigment dispersion and pigment ink, solve the mixed crystal problem of pigment and pigment dispersion, the wide particle size distribution problem of pigment dispersion, and owing to utilize above-mentioned pigment, The color unevenness of the recorded image due to the pigment ink of the pigment dispersion, the color rendering deviation of the pigment dispersion used, and the clogging and discharge instability of the inkjet ink

Method used

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  • Pigment, method for producing pigment, pigment dispersion, method for producing pigment dispersion, recording ink, recording method, and recorded image
  • Pigment, method for producing pigment, pigment dispersion, method for producing pigment dispersion, recording ink, recording method, and recorded image
  • Pigment, method for producing pigment, pigment dispersion, method for producing pigment dispersion, recording ink, recording method, and recorded image

Examples

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preparation example Construction

[0108] The preparation method of the pigment dispersion according to the present invention is characterized in that, in the presence of a pigment monomolecular precursor dissolved or dispersed in a liquid medium and a dispersant for dispersing the colored pigment, the pigment monomolecular precursor A dispersion of colored pigments formed by compounds whose molecular structures have been transformed. It is particularly preferred that if the reverse Diels-Alder reaction is used as a means of molecular structure transformation, a good dispersion of the desired colored pigment can be obtained.

[0109] According to this method, preparation of a colored pigment basically composed of a primary particle maintaining type and dispersion of the colored pigment can be carried out in the same liquid layer. Because there is no need to utilize the drying process in the pigment preparation process as before, the pigment will not aggregate. Therefore, since the process shifts to the dispers...

Embodiment

[0140] In the following, an example based on the present invention will be shown to make the effects of the present invention more apparent, but the present invention is not limited to the example. Also, "parts" and "%" in the text indicate a mass basis unless otherwise stated. In addition, the following abbreviations are used below.

[0141] THF: Tetrahydrofuran

[0142] DBU: 1,8-diazabicyclo[5,4,0]undecene-7

[0143] DMF: Dimethylformamide

[0144] LDA: lithium diisopropylamide

Synthetic example 1

[0145] [Synthesis Example 1]

[0146] According to the flow chart described in Fig. 4, porphyrazine pigment monomolecular precursor was synthesized.

[0147] (Synthesis of Compound 2)

[0148]First, a 20% ethyl acetate solution (25 ml) of 1,2-dihydroxycyclohexadiene (compound 1) was prepared as a raw material, and the solvent in the solution was concentrated under reduced pressure. Acetone (30 ml), 2,2-dimethoxypropane (69 ml), and a trace amount of p-toluenesulfonic acid were added thereto, followed by stirring at room temperature for 4 hours. Next, 10% aqueous sodium hydroxide solution (30 ml) and saturated brine (30 ml) were added and stirred to stop the reaction, and extraction was performed with diethyl ether (3×30 ml). Then, the organic layer obtained after the extraction operation was washed with saturated brine (3×30 ml), dried over anhydrous sodium sulfate, and concentrated under reduced pressure. As a result, 8.33 g of Compound 2 in which the hydroxyl group of Co...

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Abstract

Disclosed is a novel pigment dispersion wherein a colored pigment in the state of primary particles is stably dispersed in a liquid solvent. This pigment dispersion can be used as a colorant for an ink, especially for an ink suitably used in inkjet recording. Also disclosed are a method for producing such a pigment dispersion, an ink using such a pigment dispersion, and a recorded image.

Description

technical field [0001] The present invention relates to a pigment, a method for producing the pigment, a pigment dispersion, a method for producing the pigment dispersion, a recording ink using the same, a recording method, and a recorded image. Specifically, it relates to a pigment dispersion having stable dispersion and uniform pigment particle size, a method for preparing the pigment dispersion, a recording ink using the pigment dispersion, a recording method using the recording ink, and recorded images. Background technique [0002] Currently, dyes are used as coloring materials for inkjet recording liquids (inks) requiring high fineness. Inks using dyes can realize images characterized by high transparency, high definition, and good color rendering properties, but have problems in that image fastness, such as light fastness and water fastness, is often poor. In recent years, in order to solve the problem of poor image fastness, pigment inks using organic pigments and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00B41J2/01B41M5/00C09B67/20C09B67/46C09D11/00
CPCC09B67/009C09D11/322
Inventor 河部美奈子永岛聪石川贵之须釜定之
Owner CANON KK
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