KR-20260063256-A - Cyan pigment synergist and cyan pigment ink composition containing the same

Abstract

The present invention relates to a blue pigment synergist represented by the following chemical formula 1, and a blue pigment ink composition containing the same. The blue pigment synergist developed in the present invention exhibits the characteristic of dissolving in water and polar solvents, and can improve dispersibility in water-soluble ink through interaction with pigments. Accordingly, a blue pigment ink composition using such a pigment synergist has the advantage of significantly improving the dispersibility of micronized pigments, having excellent storage stability, and being able to achieve high output power because the nozzle does not clog during printing. Chemical formula 1 In the above chemical formula 1, M is any one metal atom selected from the group consisting of Cu, Zn, Co, Ni, Sn, Pb, Mg, and Fe, and R1 and R2 are one or more carboxylic acids or sulfuric acids that are the same or different from each other.

Inventors

• 정정설
• 이재현

Assignees

• 재단법인 한국화학융합시험연구원

Dates

Publication Date

20260507

Application Date

20241030

Claims (6)

1. Blue pigment synergist represented by the following chemical formula 1: Chemical formula 1 In the above chemical formula 1, M is any one metal atom selected from the group consisting of Cu, Zn, Co, Ni, Sn, Pb, Mg, and Fe, and R1 and R2 are one or more carboxylic acids or sulfuric acids that are the same or different from each other.
2. In Article 1, The above blue pigment synergist is a blue pigment synergist having the structure of the following chemical formula 2 or 3: Chemical formula 2 Chemical formula 3
3. In paragraph 1, The above blue pigment synergist is a blue pigment synergist comprising two or more acid groups in its backbone.
4. A blue pigment ink composition comprising a blue pigment synergist according to claim 1.
5. In paragraph 4, A blue pigment ink composition in which the above blue pigment synergist is included in a dispersion state dispersed in water and an acrylic dispersant, and is included in an amount of 0.1 to 5 weight% of the total composition.
6. In paragraph 4, The above blue pigment ink composition is a blue pigment ink composition having a viscosity change rate of less than 4% after 7 days.

Description

Cyan pigment synergist and cyan pigment ink composition containing the same The present invention relates to a blue pigment synergist and a blue pigment ink composition containing the same. Specifically, it relates to a blue pigment synergist capable of high-output printing by modifying the structure of the blue pigment synergist to achieve excellent dispersibility within the pigment ink composition, and a blue pigment ink composition containing the same. Ink-jet printing technology forms an image on a substrate by rapidly spraying a fluid in the form of ink into the shape of a microdroplet through a nozzle inside a printer head, and is intended for use as a printer for printing documents for a computer. This inkjet printing is a technology that is very advantageous in terms of production costs because it can produce all colors using four colors (Cyan, Magneta, Yellow, Black, CMYK), enables mass production, has a very short processing time, and utilizes a highly efficient system in which ink is ejected by digital signals. Korean published patent 2017-0136205 discloses a phthalocyanine-based pigment synergist having a carboxyl group or a sulfonic acid group represented by the following chemical formula, a blue pigment ink composition containing the same, and a method for manufacturing the same. When preparing an ink composition using the pigment synergist described above, if the dispersibility of the synergist is problematic, the storage stability of the ink composition produced therefrom is poor, leading to a problem where the nozzle clogs during printing. Therefore, there is a need to develop a synergist with excellent dispersibility. FIG. 1 is a photograph showing the process of preparing a pigment dispersion (mill base) using the dispersion shaker of Example 3 of the present invention, and Figures 2 to 4 are the results of measuring the solubility of (1) pigment blue (PB 15:3), (2) PC-PDA pigment synergist, and (3) PC-BMA pigment synergist in DMSO and water, respectively. The present invention will be described in more detail below. The terms used in this specification are for describing specific embodiments and are not intended to limit the invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Additionally, as used herein, “comprise” and/or “comprising” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. The present invention relates to a blue pigment synergist and a blue pigment ink composition containing the same. The blue pigment synergist of the present invention has improved solubility by substituting two or more acid groups on the backbone as represented by the following chemical formula 1, and when applied to a blue ink pigment composition, it can improve dispersibility and storage stability and has the characteristic of excellent print quality. Chemical formula 1 In the above chemical formula 1, M is any one metal atom selected from the group consisting of Cu, Zn, Co, Ni, Sn, Pb, Mg, and Fe, and R1 and R2 are one or more carboxylic acids or sulfuric acids that are the same or different from each other. According to one embodiment of the present invention, the blue pigment synergist may have a structure of the following chemical formula 2 or 3: Chemical formula 2 Chemical formula 3 The blue pigment synergist represented by the above chemical formula 1 can be prepared by adding pigment blue (PB 15:3) to sulfuric acid and stirring to dissolve it, and then adding a compound containing two acid groups thereto. The present invention also provides a blue pigment ink composition comprising a blue pigment synergist represented by the above chemical formula 1. According to one embodiment of the present invention, the blue pigment synergist is included in the form of a pigment dispersion dispersed in water and an acrylic dispersant, and it is preferable that the content of the pigment synergist in the total pigment composition be 0.1 to 5 weight percent. The above acrylic dispersant is preferably one selected from the group consisting of polyacrylic acid, polymethacrylic acid, poly(styrene-acrylic acid), poly(styrene-methacrylic acid), poly(styrene-maleic acid), poly(styrene-maleic anhydride), copolymers of acrylic acid or methacrylic acid with alkyl acrylate or methacrylate, poly(ethylene-acrylic acid), or salts thereof. The pigment dispersion according to the present invention is prepared by mixing an acrylic dispersant with distilled water and stirring until completely dissolved, then adding the blue pigment and blue pigment synergist according to the present invention and mixing with a Homomixer. In addition, it is important to ensure that the pigment synergist is well dispersed by sufficiently dispersing the dispersion in a dispersion shaker (Disper DAS