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Pigment dispersion and recording ink, and ink cartridge, ink jet recording method, and ink jet recording device

A technology of pigment dispersion and pigment dispersant, which is applied in the field of ink cartridges and inkjet recording devices, and can solve the problems of low printing quality, feathering, water resistance and insufficient fixing ability

Inactive Publication Date: 2009-02-04
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This ink effectively reduces bleed and dries easily on plain paper, while having disadvantages such as feathering, lower print density, and lower print quality
However, these solutions suffer from shade changes and increased pigment content in the ink, therefore, it is difficult to obtain favorable shades at higher pigment content, and water resistance and fixability may be insufficient in the case of self-dispersing pigments

Method used

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  • Pigment dispersion and recording ink, and ink cartridge, ink jet recording method, and ink jet recording device
  • Pigment dispersion and recording ink, and ink cartridge, ink jet recording method, and ink jet recording device
  • Pigment dispersion and recording ink, and ink cartridge, ink jet recording method, and ink jet recording device

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment A-1

[0377] Preparation of Solution A-1 of Polymer Dispersion Stabilizer

[0378] A mixture of the ingredients shown below was mixed with a mechanical stirrer under heating to dissolve the α-olefin / maleic anhydride copolymer (I), and then a trace amount of insoluble matter was filtered out with a filter having an average pore size of 5 μm, thereby preparing a polymer dispersion stabilizer of solution A-1.

[0379] α-Olefin / maleic anhydride copolymer (I) *1) 10.0 copies

[0380] 1N KOH aqueous solution *2) 68.62 copies

[0381] 21.38 parts of deionized water

[0382] 1) T-YP110, manufactured by Seico PMC Co., number of carbon atoms in the olefin chain: 12 to 14, acid value: 385 mgKOH / g, mass average molecular weight: 9000

[0383] 2) 1.0 times the amount of alkali, in terms of acid value

preparation Embodiment A-2

[0385] Preparation of Solution B of Polymer Dispersion Stabilizer

[0386]A mixture of the ingredients shown below was mixed with a mechanical stirrer under heating to dissolve the α-olefin / maleic anhydride copolymer (II), and then a trace amount of insoluble matter was filtered out with a filter having an average pore size of 5 μm, thereby preparing a polymer dispersion stabilizer solution B.

[0387] α-Olefin / maleic anhydride copolymer (II) *1) 10.0 copies

[0388] 1N NaOH aqueous solution *2) 28.08 copies

[0389] 61.92 parts of deionized water

[0390] 1) T-YP110, manufactured by Seico PMC Co., carbon number of olefin chain: 16 to 18, acid value: 221 mgKOH / g, mass average molecular weight: 11000

[0391] 2) 1.0 times the amount of alkali, in terms of acid value

preparation Embodiment A-3

[0393] Preparation of Solution C of Polymer Dispersion Stabilizer

[0394] A mixture of the ingredients shown below was mixed with a mechanical stirrer under heating to dissolve the α-olefin / maleic anhydride copolymer (III), and then a trace amount of insoluble matter was filtered out with a filter having an average pore size of 5 μm, thereby preparing a polymer dispersion stabilizer solution C.

[0395] α-Olefin / maleic anhydride copolymer (III) *1) 10.0 copies

[0396] 1N LiOH aqueous solution *2) 17.34 copies

[0397] 72.66 parts of deionized water

[0398] 1) T-YP112, manufactured by Seico PMC Co., number of carbon atoms in the olefin chain: 20 to 24, acid value 190 mgKOH / g, mass average molecular weight: 10000

[0399] 2) 1.2 times the amount of alkali, in terms of acid value

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Abstract

A pigment dispersion is provided that comprises a pigment, a pigment dispersant, a polymer dispersion stabilizer and water, wherein the polymer dispersion stabilizer is an alpha-olefin / maleic anhydride copolymer expressed by the formula (1) below. A recording ink is also provided that comprises the pigment dispersion, a surfactant, a water-dispersible resin, a humectant and water. in the structural formula (1), R represents an alkyl group and n is an integer of 30 to 100.

Description

technical field [0001] The present invention relates to a pigment dispersion exhibiting excellent pigment dispersion stability under long-term storage, a recording ink suitable for inkjet recording, and also to an ink cartridge, an inkjet recording method, and an inkjet recording apparatus. Background technique [0002] Recently, inkjet printers have been widely used due to their low noise and low running cost, and color printers capable of printing on plain paper have been actively put into the market. However, it is difficult for an inkjet printer to satisfy all general properties such as color reproducibility, durability, light fastness, image drying performance, image without feathering or bleeding, Duplex printing and ejection stability, so inks are selectively used considering important properties for various applications. [0003] Inks for inkjet printers are usually water-based and contain colorants such as dyes or pigments and humectants such as glycerin to prevent...

Claims

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Application Information

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IPC IPC(8): C09D17/00B41J2/01B41M5/00C09D11/00C09D11/322C09D11/326C09D11/38
Inventor 后藤宽松山彰彦永井希世文
Owner RICOH KK
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