Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method

An inkjet recording method and water-based ink technology, which can be applied to ink, printing, household appliances, etc., can solve the problems of increasing the amount of ink imparted, insufficient area and area coefficient, and insufficient image density.

Inactive Publication Date: 2008-02-20
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to studies by the inventors of the present invention, it has been found that in the above technique, in order to aggregate pigment particles on the recording medium, there is an area (so-called area factor) in which the surface of the recording medium is covered with the coloring material relative to the volume of the ink droplet. Insufficient situation
Compared with conventional pigment inks in which pigments are dispersed by polymer dispersants, etc., this means that in order to obtain the same image density in the above technique, the amount of ink that needs to be applied increases, and there is still room for improvement in this point.
In addition, there is a method to obtain a large area factor even with a small-volume ink droplet by improving the penetrability of the ink to the recording medium. However, when the penetrability of the ink is improved, not only the surface of the recording medium, Also permeates to the inside, and sufficient image density cannot be obtained

Method used

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  • Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method
  • Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method
  • Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0237] Using each of the water-soluble organic solvents and pigment dispersions 1 to 3 prepared above, mix the ingredients listed in Table 2, stir well to dissolve or disperse, and pressurize in a micron filter (manufactured by Fuji Film) with a pore size of 3.0 μm. Filtrate, prepare the printing ink of embodiment 1~5. At this time, when the total weight (weight %) of the good solvent in the ink is A, and the total weight (weight %) of the poor solvent in the ink is B, the ratio of A:B is 10:5 or more and 10:30 or less. In addition, when comparing the respective Ka values ​​of a plurality of water-soluble organic solvents obtained by the Bristow method with respect to the Ka value of the 20% aqueous solution of the above-mentioned good solvent of the water-insoluble colorant obtained by the Bristow method, the preparation The water-soluble organic solvent with the largest Ka value is a poor solvent.

[0238] Table 2: The ink composition of embodiment 1~5

[0239] ...

Embodiment 4

[0241]

[0242] Regarding the ink of Example 4 prepared above, its composition was assumed to be unknown, and it was verified that the ink was an object of the present invention by the following method. According to the verification method, even if the ink has an unknown composition, it can be confirmed whether or not the ink is the object of the present invention.

[0243] The type and amount of the organic solvent contained in the ink are used, for example, by GC / MS (trade name: TRACE DSQ; manufactured by ThermoQuest Corporation). Specifically, for example, 1 g of the ink of Example 4 was fractionated, and a sample diluted with methanol was analyzed by the above-mentioned GC / MS. As a result, the presence of glycerin, diethylene glycol, and polyethylene glycol 600 was first confirmed. Next, it is necessary to judge whether these three solvents are good solvents or poor solvents. Using the method for judging good solvents and poor solvents above, prepare a dispersion that ...

Embodiment 7～16

[0323] As the black ink, the above-mentioned inks of Examples 1 to 5 were used together with color inks for image formation. The color inks used at this time were formulated as follows.

[0324] (production of cyan ink)

[0325] The components shown below were mixed and stirred sufficiently to dissolve them, and filtered under pressure on a micron filter (manufactured by Fuji Film) with a pore size of 0.2 μm to prepare a cyan ink.

[0326] · DBL (Direct Blue) 199 3.5 parts

[0327] ·7.5 parts of glycerol

[0328] 7.5 parts of diethylene glycol

[0329] ·Ethynyl alcohol E-100 1.0 parts

[0330] ·80.5 parts of pure water

[0331] (Magenta ink production)

[0332] The red ink was prepared in the same way as the cyan ink according to the following ingredients.

[0333] · AR (acid red) 289 2.5 parts

[0334] ·7.5 parts of glycerol

[0335] 7.5 parts of diethylene glycol

[0336] ·Ethynyl alcohol E-100 1.0 parts

[0337] ·81.5 parts of pure water

[0338] (production of ...

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Abstract

A water base ink comprising water, multiple water soluble organic solvents of different types and a water insoluble color material, wherein the multiple water soluble organic solvents comprises a good solvent for the water insoluble color material and a poor solvent for the water insoluble color material, wherein providing that A represents the total amount (mass%) of good solvent in the ink while B represents the total amount (mass%) of poor solvent in the ink, the ratio of A:B is in the range of 10:5 to 10:30, and wherein upon comparison of the respective Ka values, determined in accordance with the Bristow method, of the multiple water soluble organic solvents, the water soluble organic solvent exhibiting the maximum Ka value is a poor solvent. With respect to pigment inks, images of high OD having a satisfactorily large area factor even with a small amount of ink drop can be obtained.

Description

technical field [0001] The present invention relates to a water-based ink containing a water-insoluble colorant, and more specifically to a recording method and recording device using an inkjet recording method, and furthermore, to a water-based ink suitable for an inkjet image forming method. Background technique [0002] Conventionally, it has been known that an image excellent in fastness such as water resistance and light resistance can be obtained by including a water-insoluble colorant as a colorant, such as a pigment-containing ink (pigment ink). [0003] In recent years, various technical proposals have been made for the purpose of further improving the optical density of formed images based on such inks. For example, it has been proposed to further improve the image density by using an ink containing self-dispersing carbon black and a specific salt (for example, refer to Patent Document 1). In addition, there is an inkjet recording ink containing a composition of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/00B41J2/01C09D11/32C09D11/322
Inventor 真田干雄高桥胜彦小笠原干史渡边智成德田愉衣
Owner CANON KK
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