JP2002129060A - Coloring material, ink for ink-jet recording, ink cartridge, recording apparatus, and production method for ink-jet recording ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a water resistance of an image formed on a recording paper 51. SOLUTION: A coloring material 1 has a dye 2 covalent-bonded with a first polymer 3. The ink for ink-jet recording has the above coloring material, a wetting agent, a penetrating agent, a water and a second polymer 4 which disperses the above coloring material in the water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a color material, an ink for ink jet recording, an ink cartridge and a recording apparatus provided with the ink, and a method of manufacturing the ink for ink jet recording.

[0002]

2. Description of the Related Art Conventionally, inks used for ink jet recording include a coloring material composed of a dye, a wetting agent,
Those containing a penetrant and water are well known. However, when an image is formed on recording paper using an ink containing a coloring material composed of a dye, the water resistance of the image becomes a problem. In particular, plain paper (a wide range of commercially available papers, especially papers used in electrophotographic copying machines, not intended to have the optimum structure, composition, characteristics, etc. for inkjet recording) Paper)
Very poor water resistance.

[0003] Therefore, conventionally, attempts have been made to improve the water resistance by binding a dye to a polymer. Specifically, for example, it comprises an internal colored emulsion obtained by dispersion polymerization of an ethylenically unsaturated monomer having a basic group and a salt-forming body of a water-soluble dye having two or more acidic groups. Ink (JP-A-11-32)
No. 2815) or an ink comprising a colored emulsion in which a polymer obtained from a dye composition obtained by blending an oily dye with a monomer composition is dispersed in an aqueous medium (JP-A-2000-154341). See).

[0004]

However, in the former proposed example (JP-A-11-322815), the ethylenically unsaturated monomer and the salt-forming body of the water-soluble dye form an ionic bond. In water, both are easily dissociated in water, and when the image on the recording paper is wet with water, the dye is easily separated from the ethylenically unsaturated monomer. In addition, the latter proposed example (JP-A-2000-15)
No. 4341) does not particularly consider the bond between the monomer composition and the dye, and therefore there is a possibility that the dye may seep out of the monomer composition and be separated in water. Therefore, sufficient water resistance cannot be expected with the conventional ink.

The present invention has been made in view of the foregoing, and an object of the present invention is to provide a color material and an ink jet recording ink capable of improving the water resistance of an image on recording paper.

[0006]

In order to achieve the above object, in the first aspect of the present invention, a coloring material includes a dye covalently bonded to a first polymer.

[0007] Since the dye is covalently bonded to the first polymer, unlike the ionic bonding, the two are not easily separated in water. As a result, even if the image formed on the recording paper by the ink containing the coloring material becomes wet with water, the dye does not ooze out of the first polymer and does not separate, thereby improving the water resistance of the image on the recording paper. Can be done.

According to a second aspect of the present invention, in the first aspect, the dye is an acid dye or a direct dye, and the first polymer has an amino group, an imino group and a hydroxyl group before the covalent bond with the dye. Assume that it has at least one of them.

Thus, the dye has, for example, a carboxyl group or a sulfone group before the covalent bond, and the carboxyl group or the sulfone group reacts with the amino group, imino group or hydroxyl group of the first polymer. Thus, the dye and the first polymer are easily covalently bonded.

In a third aspect of the present invention, in the first aspect, the dye is a basic dye, and the first polymer is
It has at least one of a carboxyl group and a sulfone group before covalent bonding with the dye.

Thus, the dye has, for example, an amino group or a hydroxyl group before the covalent bond, and the amino group or the hydroxyl group reacts with the carboxyl group or the sulfone group of the first polymer to form the dye. And the first polymer are easily covalently bonded.

According to a fourth aspect of the present invention, in the first aspect, the covalent bond between the dye and the first polymer is at least one of a carboxylic acid amide bond, a sulfonic acid amide bond, and an ester bond. And Thus, a covalent bond having a high bonding force can be easily obtained.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the invention, the first polymer is at least one of a polymer of a polymerizable monomer, a dendritic polymer and a natural polymer. It is assumed that Claim 6
According to the invention, the dendritic polymer in the invention of claim 5 is a hyperbranched polymer or a dendrimer. According to these inventions, a large number of dye molecules can be covalently bonded to the first polymer in a high-density state, and the water resistance of an image can be further improved.

According to a seventh aspect of the present invention, there is provided an ink-jet recording ink, wherein the ink-jet recording ink comprises a coloring material having a dye covalently bonded to the first polymer, a wetting agent, It shall contain a penetrant, water, and a second polymer that disperses the coloring material in water.

According to the present invention, the same function and effect as those of the first aspect can be obtained, and even if the coloring material is difficult to disperse in water, the coloring material can be dispersed in water by the second polymer. Thus, the viscosity of the ink can be made uniform throughout and suitable for inkjet recording.

In the invention according to claim 8, in the invention according to claim 7, the first polymer is at least one of a polymer of a polymerizable monomer, a dendritic polymer and a natural polymer. I do. With this, the same operation and effect as the fifth aspect of the invention can be obtained.

According to a ninth aspect of the present invention, in the seventh or eighth aspect, the second polymer is a polymer of a polymerizable monomer and can be dispersed in water. In particular,
According to a tenth aspect, in the ninth aspect, the second
Is a polymer of at least one of an acrylic ester, an acrylic amide, a methacrylic ester, and a methacrylic amide. In the invention of claim 11, in the invention of claim 9,
The second polymer is a vinyl copolymer containing at least one of styrene, acrylic ester, methacrylic ester and acrylamide, and at least one of acrylic acid and methacrylic acid. According to these inventions, the coloring material can be easily and uniformly dispersed in water.

According to a twelfth aspect of the present invention, in any one of the seventh to eleventh aspects, the viscosity is 1 to 10 mPa · s. By doing so, an ink having a viscosity particularly suitable for inkjet recording can be obtained.

According to a thirteenth aspect of the present invention, in any one of the seventh to twelfth aspects, the dye is any one of an acid dye, a direct dye and a basic dye.

Thus, if the first polymer is appropriately selected according to the type of the dye, the dye and the first polymer can be easily covalently bonded, as in the invention of the second or third aspect. it can.

According to a fourteenth aspect of the present invention, an ink cartridge is provided.
An ink jet recording ink according to any one of claims 7 to 13 is provided. Thus, if the ink cartridge is mounted on a recording apparatus and recording is performed, an image having excellent water resistance can be formed on recording paper.

According to a fifteenth aspect of the present invention, there is provided a recording apparatus. In the present invention, it is assumed that the recording apparatus includes the ink for inkjet recording according to any one of the seventh to thirteenth aspects. According to the present invention, an image having excellent water resistance can be formed on recording paper.

According to a sixteenth aspect of the present invention, there is provided a method of manufacturing an ink for ink-jet recording, wherein a dye is reacted with a first polymer to form a covalent bond between the dye and the first polymer. Generating a color material by dispersing the color material in water with a second polymer to prepare a dispersion of the color material; and dispersing the color material dispersion, a wetting agent, a penetrant, and water. And a step of mixing.

This makes it possible to easily manufacture an ink capable of improving the water resistance of an image on recording paper.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 schematically shows an ink jet recording apparatus provided with the ink for ink jet recording according to the embodiment of the present invention. This recording apparatus includes an ink jet head 30 in which an ink cartridge (not shown) having the above ink is integrally mounted. The ink in the cartridge is supplied to a pressure chamber provided in the ink jet head 30 and having a volume that changes by the operation of the piezoelectric actuator. A predetermined amount of ink is applied to a recording paper 51 as a recording medium through a nozzle provided on the lower surface of the inkjet head 30.
And one dot is formed on the recording paper 51.

The ink-jet head 30 is supported and fixed on a carriage 31. The carriage 31 is provided with a carriage motor (not shown). The carriage motor causes the ink-jet head 30 and the carriage 31 to move in the main scanning direction (see FIG. 6). (In the X direction shown), and is guided by a carriage shaft 32 to reciprocate in that direction. The carriage 31, the carriage shaft 32, and the carriage motor constitute a relative moving unit that relatively moves the inkjet head 30 and the recording paper 51 in the main scanning direction.

The recording paper 51 is sandwiched between two transport rollers 52 which are driven to rotate by a transport motor (not shown). The sheet is transported in a sub-scanning direction (Y direction shown in FIG. 6) perpendicular to the main scanning direction. The transport motor and the transport rollers 52 constitute a relative moving unit that relatively moves the inkjet head 30 and the recording paper 51 in the sub-scanning direction.

The operation of the piezoelectric actuator is repeated at a predetermined cycle while the ink jet head 30 and the carriage 31 are moved from one end to the other end of the recording paper 51 in the main scanning direction at a substantially constant speed (however,
When the ink jet head 30 reaches a position where the ink does not land on the recording paper 51, the piezoelectric actuator does not operate), thereby causing the ink to land on a predetermined position of the recording paper 51. When the recording for one scan is completed, the recording paper 51 is conveyed by a predetermined amount in the sub-scanning direction by the conveying motor and the respective conveying rollers 52, and the ink is again moved while the inkjet head 30 and the carriage 31 are moved in the main scanning direction. By discharging the ink, printing for one new scan is performed. By repeating this operation, the recording paper 51
A desired image is formed entirely.

As shown schematically in FIG. 1, the above-mentioned ink comprises a coloring material 1 having a dye 2 covalently bonded to a first polymer 3 (the oval in FIG. 1 is a dye molecule). A wetting agent such as glycerin that suppresses drying at the nozzle openings of the inkjet head 30, a penetrating agent such as diethylene glycol monobutyl ether that increases the permeability of the ink into the recording paper 51, water, and the color And a second polymer 4 for dispersing the material 1 in water.
In FIG. 1, the first polymer 3 of the coloring material 1 is a linear polymer of a polymerizable monomer, but a polymer of a polymerizable monomer and a dendritic polymer (dendritic polymer). Molecule) and a natural polymer. The dendritic polymer includes a hyperbranched polymer as shown in FIG. 2 and a dendrimer as shown in FIG. 3, but any of them may be used.

Examples of the polymer of the polymerizable monomer include polyallylamine represented by Chemical Formula 1 (polymerization degree n = 10).
To about 10,000).

[0031]

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Specific examples of the above-mentioned hyperbranched polymer include those represented by the following chemical formulas 2 and 3.

[0033]

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[0034]

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The compound of formula 2 can be easily obtained by a direct polycondensation method by heating the compound of formula 4 in triphenyl phosphite and pyridine.

[0036]

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In order to produce the compound of the above formula 3, first, an amine compound represented by the following formula 5 is converted to water-
By reacting acrylonitrile with cyanoethylation in toluene with an acetic acid catalyst, a compound of formula 6 is produced.

[0038]

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[0039]

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Next, the compound of the formula (6) is subjected to a hydrogenation reaction with a cobalt catalyst (Raney catalyst) to produce the compound of the formula (7).

[0041]

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That is, from one amino group (Chemical formula 5), two branched amino groups (Chemical formula 7) are obtained, and by repeating the above reaction, the compound of Chemical formula 3 can be easily obtained.

Further, specific examples of the dendrimer include those represented by the following chemical formulas 8 and 9.

[0044]

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[0045]

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As a method for producing such a dendrimer, there are a divergent method for synthesizing from the center to the outside and a convergent method for synthesizing from the outside to the center.

The dye 2 is desirably any one of an acid dye, a direct dye, and a basic dye. When the dye 2 is an acid dye or a direct dye, the first polymer 3
Is at least one of an amino group (NH ₂ ), an imino group (NH) and a hydroxyl group (OH) before the covalent bond with the dye 2.
It is desirable to have one. in this case,
Dye 2 is treated with a carboxyl group (COO
H) or a sulfone group (SO ₃ H),
This carboxyl group or sulfone group is the first polymer 3
The dye 2 and the first polymer 3 are easily covalently bonded to the amino group, the imino group or the hydroxyl group. On the other hand, when the dye 2 is a basic dye, the first polymer 3
It is preferable that the dye has at least one of a carboxyl group and a sulfone group before the covalent bond with the dye 2. In this case, the dye 2 has, for example, an amino group or the like before the covalent bond, and the amino group or the like reacts with a carboxyl group or a sulfone group of the first polymer 3 to form the dye 2 and the first polymer 3 And are easily covalently bonded. That is, the covalent bond between the dye 2 and the first polymer 3 is desirably at least one of a carboxylic acid amide bond, a sulfonic acid amide bond, and an ester bond. Such a covalent bond can be easily obtained by appropriately selecting the first polymer 3 accordingly.

The compounds of formulas 1, 3, 8 and 9 have an amino group before the covalent bond, and those of formula 2 have an amino group and an imino group before the covalent bond. Have And, for example, the first
FIG. 4 shows the bonding state of the polymer 3 having the amino group before the covalent bond and the dye 2 having the carboxyl group before the covalent bond. FIG. 5 shows a bonding state of the dye 2 having an amino group before and the dye 2 having a sulfone group before the covalent bond. The color material 1 is the first
It is not necessary that all of the amino groups and the like of the polymer 3 are covalently bonded to the dye 2, but may be partially formed by other bonding.

The coloring material 1 is covered with the second polymer 4 to form fine particles of about 0.1 μm or less, and these many fine particles are dispersed in water to form the coloring material 1.
Will be dispersed in water. In order to uniformly disperse the coloring material 1 in water, it is desirable that the second polymer 4 is a polymer of a polymerizable monomer and can be dispersed in water. Specific examples of the second polymer 4 include a polymer of at least one of an acrylate, an amide, a methacrylate, and a methacrylate, and styrene, an acrylate, and a methacrylate. And a vinyl copolymer containing at least one of acrylic acid amide and at least one of acrylic acid and methacrylic acid.

Although the second polymer 4 is not strongly bonded to the color material 1 like the covalent bond between the dye 2 of the color material 1 and the first polymer 3, Dye 2 of material 1
And the polarity generated in the first polymer 3 is adsorbed with a relatively strong force, whereby the second polymer 4 is dispersed in water while covering the coloring material 1.

The viscosity of the ink is 1 to 10 mPa · s.
It is desirable that That is, if the viscosity is within this range, it is possible to set and stabilize the discharge amount, the discharge speed, and the like when the ink in the pressure chamber of the inkjet head 30 is discharged onto the recording paper 51 via the nozzles, and stabilize. It is suitable for inkjet recording. Such a viscosity can be easily obtained by containing the second polymer 4, and the second polymer 4 can make the viscosity of the ink uniform throughout.

To manufacture the above ink, first, dye 2
And the first polymer 3 are reacted to form a covalent bond between the dye 2 and the first polymer 3, thereby producing the color material 1. Subsequently, the color material 1 is dispersed in water with the second polymer 4 to prepare a dispersion of the color material 1, and thereafter, the dispersion of the color material 1, a wetting agent, a penetrant, and water are mixed. Thus, the above ink is obtained.

For example, when the dye 2 is an acid dye, the first polymer 3 is a polyallylamine, and the second polymer 4 is a polyacrylate, first, the acid group of the dye 2 and the polyallylamine Is covalently bonded by amidation by a usual organic chemical reaction.
Thereby, the coloring material 1 is obtained.

Subsequently, using water as a solvent, the coloring material 1, the acrylate and the polymerization initiator (azoisobutylamidine hydrochloride) were added, and the mixture was heated at 50 ° C. for 2 hours while being subjected to ultrasonic treatment.
By reacting for 4 hours, the coloring material 1 is dispersed in water by a polyacrylate obtained by polymerizing the acrylate. Thus, a dispersion of the coloring material 1 is obtained.

Next, an ink is obtained by mixing the dispersion of the coloring material 1, a wetting agent, a penetrating agent, and water.

When the dye 2 and the first polymer 3 are the same as those in the above-mentioned production example, and the second polymer 4 is polyacrylamide, first, the coloring material 1 is produced in the same manner as in the above-mentioned production example. Is produced, a surfactant and acrylic acid amide are added using water as a solvent, and the mixture is heated and stirred at 50 ° C.
Next, a polymerization initiator was added to the heated and stirred mixture, and then a mixture of the coloring material 1 and acrylamide was further added dropwise over 2 hours. After the addition, the mixture was stirred at the same temperature for 4 hours to obtain a color. The material 1 is dispersed in water by polyacrylamide obtained by polymerizing acrylamide.
Then, when cooled to room temperature, a dispersion of the coloring material 1 is obtained. Next, an ink is obtained by mixing the dispersion of the coloring material 1, the wetting agent, the penetrant, and water in the same manner as in the above-mentioned production example.

Therefore, in the above embodiment, since the coloring material 1 includes the dye 2 covalently bonded to the first polymer 3, unlike the ionic bonding and the like, it is difficult for the two to be easily separated in water. Absent. As a result, even if the image formed on the recording paper 51 with the ink containing the coloring material 1 becomes wet with water, the dye 2 does not seep out from the first polymer 3 and is not separated. The water resistance of the image can be improved. Further, even if the coloring material 1 is difficult to disperse in water, it is dispersed in water by the second polymer 4, so that the viscosity of the ink is uniform throughout and suitable for inkjet recording (1 to 10 mPa.s). S).

[0058]

Next, a specific embodiment will be described.

First, as shown in the following Examples 1 to 24, 24 kinds of inks for ink jet recording were produced.

Example 1 In a reaction vessel provided with a nitrogen inlet tube and a stirrer, 10 g of polyallylamine having an average degree of polymerization of 100 and dye (CI acid black 2) 6
4.3 g, triphenyl phosphite 109 g and lithium chloride 17.5 g were added to N-methyl-2-pyrrolidone 3
It was dissolved in 50 mL and 87.5 mL of pyridine and stirred at 100 ° C. for 3 hours under a nitrogen atmosphere. This reaction solution was added to 35
The solution was poured into 00 mL of methanol, and the precipitated polymer (covalently bonded to the dye) was filtered. Treating the polymer covalently bonded to the dye in boiling methanol for 30 minutes,
Drying under reduced pressure gave a coloring material.

Next, 35.10 of the above coloring material was added to 1 L of water.
8 g and 32.6 g of dodecyldimethylammoniumethyl-methacrylate were added to N-methyl-2-pyrrolidone 3
A solution dissolved in 00 mL and 1 g of azoisobutylamidine hydrochloride were added, and the mixture was sonicated at 50 ° C. for 24 hours.
By reacting for a time, a black emulsion (a dispersion of a coloring material) was obtained.

Next, 30 mL of the above black emulsion was added:
10 mL of diethylene glycol monobutyl ether,
Ink was obtained by mixing 10 mL of glycerin and 55 mL of water while sonicating.

(Example 2) In Example 1, the dye was replaced with
C. I. An ink was prepared in place of Acid Yellow 17 (42 g).

(Example 3) In Example 1, the dye was replaced with
C. I. Instead of Acid Red 52 (50.8g)
An ink was prepared.

Example 4 In Example 1, the dye was replaced with
C. I. An ink was prepared in place of Direct Blue 86 (66.4 g).

(Example 5) In Example 1, the dye was replaced with
ProJet First Black 2 (Avisia, 6
4.3 g), and an ink was prepared.

(Example 6) In Example 1, the dye was replaced with
Projet First Yellow 2 (Avisia 4
2g) was replaced with an ink.

(Example 7) In Example 1, the dye was replaced with
Projet First Magenta 2 (Avisia,
50.8 g), and an ink was prepared.

Example 8 In Example 1, the dye was replaced with
Projet Fast Cyan 2 (Avisia, 6
6.4 g), and an ink was prepared.

Example 9 An ink was prepared in the same manner as in Example 1 except that polyallylamine having an average degree of polymerization of 100 was replaced by polyallylamine (10 g) having an average degree of polymerization of 1000.

(Example 10) In Example 1, polyallylamine having an average degree of polymerization of 100 was replaced with polyallylamine having an average degree of polymerization of 1000.
An ink was prepared in place of the polyallylamine of No. 0 (10 g).

Example 11 An ink was prepared in the same manner as in Example 1 except that the polyallylamine having an average degree of polymerization of 100 was replaced with the dendrimer of Chemical Formula 8 (13.4 g).

Example 12 An ink was prepared in the same manner as in Example 1, except that the polyallylamine having an average degree of polymerization of 100 was replaced with the dendrimer of Chemical Formula 9 (13.4 g).

Example 13 2 g of sodium dodecyl sulfate, 4 g of New Frontier S510, and 194
g of deionized water and 10 g of n-butoxymethylacrylamide were charged into a flask, and the temperature of the solution was raised to 50 ° C. while stirring under a nitrogen stream. Subsequently, 5 g of an ethanol solution containing 0.5 g of an oil-soluble azo polymerization initiator (trade name “V-70”: manufactured by Wako Pure Chemical Industries, Ltd.) was injected into the flask, and then n-butoxymethylacrylamide was added. 89
g, ethylene glycol dimethacrylate 1 g, and a coloring material 25 g obtained by covalently bonding a dye (CI acid black 2) to polyallylamine having an average degree of polymerization of 100 in Example 1. Was dropped into the flask over 2 hours. Then, after stirring at the same temperature for 4 hours, the mixture was cooled to room temperature to obtain a black emulsion (colorant dispersion).

Next, 30 mL of the above black emulsion was prepared.
And 10 mL of diethylene glycol monobutyl ether
And 10 mL of glycerin and 55 mL of water were mixed while performing ultrasonic treatment to obtain an ink.

(Example 14) In Example 13, the colorant in the monomer solution was covalently bonded to the dye (CI Acid Yellow 17) in Example 2 to polyallylamine having an average degree of polymerization of 100. An ink was prepared in place of the obtained coloring material.

Example 15 In Example 13, the coloring material in the monomer solution was covalently bonded to the dye (CI Acid Red 52) in Example 3 with polyallylamine having an average degree of polymerization of 100. An ink was prepared in place of the obtained coloring material.

(Example 16) In Example 13, the coloring material in the monomer solution was covalently bonded to the dye (CI Direct Blue 86) in Example 4 with polyallylamine having an average degree of polymerization of 100. An ink was prepared in place of the obtained coloring material.

(Example 17) In Example 13, the coloring material in the monomer solution was obtained by covalently bonding the dye (Projet Fast Black 2) in Example 5 to polyallylamine having an average degree of polymerization of 100. An ink was prepared in place of the color material.

(Example 18) In Example 13, the coloring material in the monomer solution was obtained by covalently bonding the dye (Projet Fast Yellow 2) in Example 6 to polyallylamine having an average degree of polymerization of 100. An ink was prepared in place of the color material.

(Example 19) In Example 13, the coloring material in the monomer solution was obtained by covalently bonding the dye (Projet Fast Magenta 2) to polyallylamine having an average degree of polymerization of 100 in Example 7. An ink was prepared in place of the color material.

(Example 20) In Example 13, the coloring material in the monomer solution was obtained by covalently bonding the dye (Projet Fast Cyan 2) to polyallylamine having an average degree of polymerization of 100 in Example 8. An ink was prepared in place of the color material.

(Example 21) In Example 13, the colorant in the monomer solution was covalently bonded to the dye (CI acid black 2) in Example 9 with polyallylamine having an average degree of polymerization of 1,000. An ink was prepared in place of the obtained coloring material.

(Example 22) In Example 13, the coloring material in the monomer solution was replaced with the dye (CI.
An ink was prepared in place of the color material obtained by covalently bonding Acid Black 2) to polyallylamine having an average degree of polymerization of 10,000.

(Example 23) In Example 13, the coloring material in the monomer solution was replaced with the dye (CI.
An ink was prepared in place of the coloring material obtained by covalently bonding Acid Black 2) to the dendrimer of Chemical Formula 8.

(Example 24) In Example 13, the coloring material in the monomer solution was replaced with the dye (CI.
An ink was prepared in place of the coloring material obtained by covalently bonding Acid Black 2) to the dendrimer of Chemical Formula 9.

Next, a commercially available printer (ink-jet recording apparatus) was prepared using the inks of Examples 1 to 24 described above.
Was recorded on plain paper (trade name "Xerox4024": manufactured by Xerox Co., Ltd.), and the recorded paper was immersed in pure water, allowed to dry at room temperature, and examined for bleeding. As a result, no bleeding was observed for any of the inks, and it was confirmed that the images recorded with the inks of Examples 1 to 24 had considerably good water resistance.

Each of the inks of Examples 1 to 24 was
After leaving for 3 months in an atmosphere of 0 ° C., and observing the state of the ink thereafter, all the inks
No precipitate was seen. From this, it was confirmed that the stability of each of the inks of Examples 1 to 24 was considerably high.

[0089]

As described above, according to the color material of the present invention, since the dye provided covalently with the first polymer is provided, the image formed on the recording paper by the ink containing the color material is provided. Water resistance can be improved.

Further, according to the ink jet recording ink of the present invention, a colorant having a dye covalently bonded to the first polymer, a wetting agent, a penetrant, water, and the colorant are dispersed in water. By containing the second polymer, the water resistance of the image on the recording paper can be improved, and the viscosity of the ink as a whole can be made uniform and suitable for inkjet recording.

Further, according to the ink cartridge and the recording apparatus of the present invention, an image having excellent water resistance can be formed on recording paper by providing the above-mentioned ink for ink jet recording.

Further, according to the method for producing an ink jet recording ink of the present invention, a step of reacting a dye with a first polymer to form a colorant by covalently bonding the dye and the first polymer. Dispersing the colorant in water with a second polymer to prepare a colorant dispersion, and mixing the colorant dispersion, a wetting agent, a penetrant, and water. This makes it possible to easily manufacture an ink capable of improving the water resistance of an image on recording paper.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing a configuration of an ink jet recording ink according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the structure of a hyperbranched polymer.

FIG. 3 is a schematic diagram showing the structure of a dendrimer.

FIG. 4 is a diagram showing a bonding state between a first polymer having an amino group before covalent bonding and a dye having a carboxyl group before covalent bonding.

FIG. 5 is a diagram showing a bonding state between a first polymer having an amino group before covalent bonding and a dye having a sulfone group before covalent bonding.

FIG. 6 is a schematic perspective view showing an ink jet recording apparatus provided with the ink for ink jet recording according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 colorant 2 dye 3 first polymer 4 second polymer

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroyuki Matsuo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Term (reference) 2C056 EA13 FC01 2H086 BA02 BA56 BA57 BA58 BA59 BA61 4J039 AD03 AD10 AD12 AE09 AE13 BA12 BC32 BC33 BC36 BC54 BC73 BC75 BC77 BC79 BE02 BE03 BE04 BE05 BE22 CA06 EA38 EA43 EA44 GA24

Claims (16)

[Claims] 1. A coloring material comprising a dye covalently bonded to a first polymer. 2. The dye is an acid dye or a direct dye, and the first polymer has at least one of an amino group, an imino group and a hydroxyl group before covalent bonding with the dye. The coloring material according to claim 1, wherein: 3. The dye is a basic dye, and the first polymer has at least one of a carboxyl group and a sulfone group before covalent bonding with the dye. The coloring material according to claim 1. 4. The covalent bond between the dye and the first polymer,
The coloring material according to claim 1, wherein the coloring material is at least one of a carboxylic acid amide bond, a sulfonic acid amide bond, and an ester bond. 5. The method according to claim 1, wherein the first polymer is at least one of a polymer of a polymerizable monomer, a dendritic polymer, and a natural polymer. The coloring material described. 6. The coloring material according to claim 5, wherein the dendritic polymer is a hyperbranched polymer or a dendrimer. 7. A colorant comprising a dye covalently bonded to a first polymer, a wetting agent, a penetrant, water, and a second polymer for dispersing the colorant in water. An ink for ink-jet recording, characterized in that: 8. The ink for ink-jet recording according to claim 7, wherein the first polymer is at least one of a polymer of a polymerizable monomer, a dendritic polymer, and a natural polymer. . 9. The ink for ink jet recording according to claim 7, wherein the second polymer is a polymer of a polymerizable monomer and is dispersible in water. 10. The ink-jet recording method according to claim 9, wherein the second polymer is at least one polymer selected from the group consisting of an acrylate, an acrylamide, a methacrylate, and a methacrylamide. For ink. 11. The second polymer is a vinyl copolymer containing at least one of styrene, acrylate, methacrylate and acrylamide and at least one of acrylic acid and methacrylic acid. The ink for inkjet recording according to claim 9, wherein: 12. The ink jet recording ink according to claim 7, wherein the viscosity is 1 to 10 mPa · s. 13. The ink jet recording ink according to claim 7, wherein the dye is any one of an acid dye, a direct dye and a basic dye. 14. An ink cartridge comprising the ink for inkjet recording according to claim 7. Description: 15. A recording apparatus comprising the ink jet recording ink according to claim 7. Description: 16. A step of reacting a dye with a first polymer to form a colorant by covalently bonding the dye and the first polymer; and dispersing the colorant in water with a second polymer. A method for producing an ink for inkjet recording, comprising the steps of: preparing a dispersion of a colorant by mixing the mixture; and mixing the dispersion of the colorant, a wetting agent, a penetrant, and water.