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Azo-pigment-containing water-based ink for inkjet recording

A technology of inkjet recording and azo pigments, applied in the direction of azo dyes, monoazo dyes, disazo dyes, etc., which can solve the problems of uneven ink density, uneven stripes, etc.

Inactive Publication Date: 2013-11-06
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it was shown that density unevenness and streak unevenness are generated when the ink is aged for a long time or exposed to high temperature

Method used

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  • Azo-pigment-containing water-based ink for inkjet recording
  • Azo-pigment-containing water-based ink for inkjet recording
  • Azo-pigment-containing water-based ink for inkjet recording

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0585] A 5 mol / L sodium hydroxide aqueous solution was added to neutralize 10 parts by mass of the obtained 50% vinyl polymer solution. Here, the aqueous solution is added in an amount of alkali large enough to completely neutralize methacrylic acid or acrylic acid in the vinyl monomer. 10 parts by mass of the pigment exemplifying compound (Pigment-1) of the present invention was added, and the mixture was kneaded by a roll mill for 2 to 8 hours as needed. The kneaded material was dispersed in 100 parts by mass of ion-exchanged water, and the organic solvent was completely removed from the obtained dispersion at 55° C. under reduced pressure. Further, the dispersion was concentrated by removing water to obtain an aqueous dispersion of pigment-containing vinyl polymer particles having a solid content concentration of 15% by mass.

[0586] The vinyl polymer of the present invention was synthesized according to the composition shown in Table 1 by the same method as in the above-...

Embodiment 2

[0627] Except that according to the formula shown in Table 3, the benzyl acrylate used in the hydrophobic structural unit of the high molecular polymer in the tests 106 to 110 of Example 1 was replaced with phenoxyethyl acrylate or benzyl acrylate, and with An aqueous ink for inkjet recording was prepared in the same manner as in Tests 106 to 110 except that the pigment compound was prepared in the same manner as in Synthesis Example 1, and the ejection accuracy was evaluated in the same manner as in Example 1. As shown in Table 3, performance as good as that in trials 106 to 110 was exhibited.

[0628] A water-based ink for inkjet recording was prepared in the same manner as in Test 109, except that the methacrylic acid used in the hydrophilic structural unit in Test 109 of Example 1 was replaced with acrylic acid, and the water-based ink for inkjet recording was prepared in the same manner as in Example 1. Ejection accuracy was evaluated in the same manner. As shown in Tabl...

Embodiment 3

[0633] Instead of placing the aqueous ink in a PET container and storing it at room temperature for 4 months after being airtightly sealed for inkjet recording, in Examples 1 and 2, the Except for storing in an environment of 58° C. for 4 weeks after airtightly sealing, ejection accuracy was evaluated in the same manner as in Example 1 by using the pigments and high molecular weight polymers shown in Table 4. As a result, as shown in Table 4, it was confirmed that, in the case of the aqueous ink for inkjet recording of the present invention, performance as good as those in Examples 1 and 2 could be obtained.

[0634]

[0635]

[0636]

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Abstract

An object of the present invention is to provide an aqueous ink for inkjet recording, ensuring that even after storage for a long period of time or exposure to a high temperature, the ejection accuracy is excellent and generation of density unevenness and streak unevenness can be suppressed. An aqueous ink for inkjet recording, comprising a vinyl polymer particle containing A and B and a water-soluble solvent: A: an azo pigment having a specific structure, its tautomer, or a salt or hydrate thereof; B: a vinyl polymer containing (a) a hydrophobic structural unit having an aromatic ring bonded to the polymer main chain through a linking group and (b) a hydrophilic structural unit.

Description

technical field [0001] The present invention relates to a novel azo pigment-containing aqueous ink for inkjet recording, which ensures excellent dispersion stability and jetting stability, and realizes no density unevenness and streak unevenness image quality. Background technique [0002] Various media are used as recording media for inkjet recording, and highly vivid image quality is necessary not only for inkjet dedicated paper but also for commercially available plain paper and printing media such as fine paper, coated paper and Fine art paper is also necessary. Pigments are preferred as ink materials capable of imparting fastness such as water resistance and light resistance on plain paper or printing media, and various studies have been conducted on aqueous pigment inks, including cost aspects. Among these, azo pigments are preferably used as yellow pigments for inkjet recording. [0003] However, it was shown that density unevenness and streak unevenness are genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/00C09B29/48C09B33/12C09B33/24C09B35/34C09B67/20B41J2/01B41M5/00C09D11/322
CPCC09B29/0081C09B29/0037C09B33/24C09B67/001C09B29/3656C09B33/12C09B67/0066C09D11/326
Inventor 立石桂一东条薰守本洁
Owner FUJIFILM CORP
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