JP2002146256A - Ink for ink jet recording and ink cartridge provided therewith, and recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability while lowering viscosity in an ink for ink jet recording containing an oily dyestuff. SOLUTION: The ink for ink jet recording comprises an oily dyestuff, a wetting agent, a penetrating agent, water and an amphiphilic star polymer exhibiting hydrophilicity outside and has a surface tension at 25 deg.C of 20-50 mN/m. As the amphiphilic star block polymer entraps therein an oily dyestuff molecule 19 by a hydrophobic segment 17 while exhibiting hydrophilicity by a hydrophilic segment 16, it is dissolved in water with the oily dyestuff molecules 19 held inside at a high concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording ink suitable for ink jet recording, an ink cartridge provided with the ink, and a recording apparatus.

[0002]

2. Description of the Related Art Conventionally, ink containing a dye as a coloring material, a wetting agent, a penetrant and water has been well known as an ink used for ink jet recording.
The wetting agent is contained to prevent the ink from drying in the ink jet head. The penetrant is included to improve the permeability to the recording paper.

Aqueous dyes are often used as dyes, but in order to increase water resistance on recording paper, it is preferable to use oily dyes. Examples of the ink using an oil-based dye include an ink comprising an oil-based dye, polyoxyethylene oxypropylene triol and an aqueous acrylic resin solution or a water-soluble acrylic resin emulsion (see JP-A-10-140055), and a monomer composition. The polymer obtained from the dye composition in which the oily dye is blended with the product,
An ink comprising a colored emulsion dispersed in an aqueous medium (see JP-A-2000-154341) is known.

[0004] Also, Polymer Preprints, Japan Vol. 49,
No.1 (2000) pp.22-24, Macromolecules, Vol.24, N
o.21, 1991, pp.5741-5745, Macromolecules, Vol.2
5, No. 24, 1992, pp. 6407-6413, by using an amphiphilic star-shaped block polymer or an amphiphilic hetero-armed star polymer, an oil-based dye which is originally insoluble in water can be used. A technique for dissolving the compound in water has also been proposed.

[0005]

The ink used for ink jet recording must have a low viscosity to some extent. If the viscosity is too high, it becomes impossible to fly as droplets from the nozzles of the inkjet head. In addition, the ink needs to have sufficient stability so as not to cause agglomeration or clogging of nozzles or the like in the ink tank. However, conventional inks containing oil-based dyes are insufficient for inkjet recording from the viewpoint of viscosity and stability.

For example, the ink disclosed in Japanese Patent Application Laid-Open No. 10-140055 has a viscosity of about 10,000 mPa · s, which is too high for use in ink jet recording. On the other hand, the ink disclosed in Japanese Patent Application Laid-Open No. 2000-154341 has a low viscosity, but it is difficult to maintain a dispersed state for a long period of time, and the stability is poor. For this reason, it is easy to cause aggregation during storage and clogging of the ink head.

On the other hand, Polymer Preprints, Japan vol. 49,
The solution obtained in No.1 (2000) pp.22-24 has a high surface tension and therefore has a low penetration rate into paper. Therefore, when the solution is used for ink jet recording, the ejected ink droplets are difficult to dry, and there is a problem that characters and images formed on paper are extremely blurred by these ink droplets. In addition, since the solution dries slowly, it was difficult for the oily dye to remain on the paper surface. Therefore, the oil-based dye penetrates to the back surface of the paper, and so-called strike-through easily occurs. Therefore, two-sided printing was difficult.

[0008] Therefore, as an ink suitable for ink-jet recording, an ink containing an oil-based dye and having a low viscosity and high stability has been desired. The present invention has been made in view of the above points, and has as its object to provide excellent water resistance on plain paper, high stability, low bleeding, high printing quality or high image quality capable of double-sided printing. It is an object of the present invention to provide an ink jet recording ink for providing a recorded matter of the type described above, an ink cartridge provided with the ink, and a recording apparatus.

[0009]

The ink-jet recording ink according to the present invention contains an oil-based dye, a wetting agent, a penetrant, water, and an amphiphilic star block polymer having a hydrophilic outer surface. , Surface tension at 25 ° C is 20-50m
N / m.

[0010] The ink for ink jet recording is 25
It is preferable that the viscosity at a temperature of 1 to 10 mPa · s.

The ink cartridge according to the present invention contains an oil-based dye, a wetting agent, a penetrant, water, an amphiphilic star block polymer having a hydrophilic outer surface, and has a surface tension at 25 ° C. of 20.イ ン ク ジ ェ ッ ト 50 mN / m.

The recording apparatus according to the present invention contains an oil-based dye, a wetting agent, a penetrant, water, an amphiphilic star block polymer having a hydrophilic outer surface, and has a surface tension at 25 ° C. of 20. Inkjet recording ink of up to 50 mN / m is provided, and recording is performed by discharging the inkjet recording ink onto a recording medium.

Another ink jet recording ink according to the present invention contains an oily dye, a wetting agent, a penetrant, water, and an amphiphilic heteroarm star polymer, and has a surface tension at 25 ° C. of 20. ５０50 mN / m.

The ink for ink jet recording is 25
It is preferable that the viscosity at a temperature of 1 to 10 mPa · s.

Another ink cartridge according to the present invention comprises:
One comprising an oil-based dye, a wetting agent, a penetrant, water, and an amphipathic heteroarm star polymer, and provided with an ink jet recording ink having a surface tension at 25 ° C of 20 to 50 mN / m. It is.

Another recording apparatus according to the present invention contains an oil-based dye, a wetting agent, a penetrant, water, and an amphiphilic heteroarm star polymer, and has a surface tension of 2 at 25 ° C.
The ink jet recording ink is provided at 0 to 50 mN / m, and recording is performed by discharging the ink jet recording ink onto a recording medium.

According to the present invention, the oil-based dye molecules are incorporated into the hydrophobic segment of an amphiphilic star polymer.
The star polymer itself dissolves in water because it is hydrophilic on the outside. Therefore, the oil-based dye molecules are dissolved in water through the star polymer by being taken into the inside of the star polymer. Therefore, the viscosity of the ink is reduced and the stability is improved.

The surface tension of the ink at 25 ° C. is 20 to
It is 50 mN / m, and the surface tension of the ink is relatively small. Therefore, the solvent consisting of the humectant, penetrant and water,
After the ejected ink adheres to the recording medium, it quickly permeates into the recording medium. Therefore, bleeding of the ink hardly occurs. When the recording medium is paper, the oil-based dye does not interact with the cellulose molecules that are a constituent material of the paper, so that the oil-based dye tends to accumulate in the upper layer of plain paper. Therefore, strikethrough is unlikely to occur. Therefore, double-sided printing becomes possible.

Here, the surface tension of the ink is preferably as low as possible from the viewpoint of speeding up the penetration into the paper. However, if the surface tension of the ink is less than 20 mN / m, it becomes difficult to form the ink into droplets when ejecting the ink. Therefore, the surface tension of the ink is 20m
N / m or more. Therefore, if the ink can be ejected well, the surface tension of the ink is 20 m.
It may be smaller than N / m.

By setting the viscosity of the ink to 1 to 10 mPa · s, an ink having a viscosity particularly suitable for ink jet recording can be obtained.

[0021]

As described above, according to the ink jet recording ink of the present invention, since the outer side contains a hydrophilic amphiphilic star polymer, oil-based dye molecules are added to the star polymer. It can be dissolved by incorporation. Thereby, the viscosity can be kept low and the storage stability can be improved.

According to the ink cartridge and the recording apparatus of the present invention, since the ink jet recording ink as described above is provided, it is possible to perform high print quality or high quality recording with excellent water resistance on plain paper. Can be.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an ink jet recording apparatus 20 according to this embodiment. The recording device 20 forms ink or an image on the recording paper 14 by causing ink ejected from the inkjet head 11 to land on a recording paper 14 as a recording medium. The ink jet head 11 integrally mounted with an ink cartridge 21 for storing ink is mounted on a carriage 12. The carriage 12 is provided with a carriage motor (not shown). The carriage motor guides the carriage 12 to a carriage shaft 13 extending in the main scanning direction X, and reciprocates in the direction. The carriage 12, the carriage shaft 13, and the carriage motor constitute a relative moving unit that relatively moves the inkjet head 11 and the recording paper 14.

The recording paper 14 is sandwiched between a plurality of sets of transport rollers 15, 15 driven to rotate by a transport motor (not shown).
Thus, the sheet is conveyed in the sub-scanning direction Y orthogonal to the main scanning direction X.

The ink jet head 11 is provided with an ink containing an oil dye as a recording ink.
This ink contains, in addition to the oil-based dye as a coloring material, a wetting agent such as glycerin that suppresses drying in the head member, a penetrating agent such as diethylene glycol monobutyl ether that increases permeability to the recording paper 14, and water. It contains. These humectants, penetrants, and water constitute the solvent of the ink. Further, the ink contains a star polymer.

As shown schematically in FIGS. 2 to 6, there are various types of star-shaped polymers. In the ink according to the present embodiment, particularly, the amphiphilic property in which the outside is hydrophilic. Contains star polymer. In the figure, 16 is a hydrophilic segment, 17 is a hydrophobic segment, and 18 is a microgel. Specifically, the ink according to the present embodiment is:
It contains an amphiphilic star-shaped block polymer as shown in FIG. 2 or an amphiphilic hetero-armed star polymer as shown in FIG. The reason for limiting the type of the star polymer in this manner is as follows.

That is, as shown in FIG. 2, when the ink contains an amphiphilic star-shaped block polymer in which the hydrophilic segment 16 is located on the outside and the hydrophobic segment 17 is located on the inside, Oily dye molecules 19 are incorporated into the hydrophobic segment 17. That is, the oil-based dye molecules 19 are incorporated into the star polymer. On the other hand, since the outside of the star polymer is hydrophilic, the star polymer itself dissolves in water. for that reason,
As a result, the oleaginous dye molecules 19 are dissolved in water through the star polymer by being taken into the star polymer. Therefore, the viscosity of the ink decreases by containing such a star polymer (preferably 1 to 10 mPa · s). Oily dye molecule 1
Since the inks 9 are less likely to aggregate, the stability of the ink is improved.

As shown in FIG. 3, the hydrophilic segment 16 and the hydrophobic segment 17 both extend from the microgel 18, and the hydrophilic segment 16 is longer than the hydrophobic segment 17. Even when a shaped polymer is contained, the oil-based dye molecules 19 are incorporated in the hydrophobic segment 17 at a high concentration. On the other hand, since the outside of the star polymer exhibits hydrophilicity, the star polymer itself dissolves in water. Therefore, also in this case, the oil-based dye molecules 1
9 is dissolved in water through the star polymer by being taken into the inside of the star polymer. Therefore,
The viscosity of the ink is kept low (for example, 1 to 10 mPa
S), stability is increased.

On the other hand, even if it is an amphiphilic star-shaped block polymer, the hydrophilic segment 16 is located inside and the hydrophobic segment 17 is located outside as shown in FIG. The above-mentioned effects such as improvement in stability and stability cannot be obtained. Because the oil-based dye molecules 19 are not taken into the star polymer,
Rather, it becomes a coalesced substance that is weakly bound to the outside of the star polymer, and the star polymer itself does not dissolve in water because the outside of the star polymer shows hydrophobicity.

As shown in FIG. 5, in the case of a star polymer in which only the hydrophobic segment 17 extends from the microgel 18, the oil-based dye molecules 19 are incorporated into the hydrophobic segment 17, but the star polymer is hydrophilic. It does not show hydrophilicity and does not dissolve in water due to the absence of a functional segment.
Therefore, even in this case, the above effects cannot be obtained.

As shown in FIG. 6, in the case of a star-shaped polymer in which only the hydrophilic segment 16 extends from the microgel 18, since the oil-based dye molecules 19 cannot be taken inside, the above-described effect is also obtained in this case. You can't get it.

For the above reasons, an amphiphilic star polymer having a hydrophilic outer side is selected for the ink of the present embodiment.

As shown in FIG. 7, such a star polymer is obtained by first converting vinyl ether 1 to HX / ZnX ₂ (X = C
1, I) to produce a living polymer 2 of polyvinyl ether having an alkyl group in the side chain, and then to obtain the living polymer 2 by reacting it with divinyl ether 3 (star-shaped polymer 4).

Specifically, the amphiphilic star-shaped block polymer having a hydrophilic outside can be produced by the synthesis method shown in FIG. In this synthesis method, first, a divinyl ether 3 is reacted with a living block polymer 5 of a vinyl ether of an ester side chain and an alkyl vinyl ether,
A precursor star polymer 6 is obtained. Next, this side chain is hydrolyzed. Thereby, an amphiphilic star-shaped block polymer 7 having a hydroxyl group is produced.

On the other hand, the amphiphilic heteroarm star polymer can be produced by the synthesis method shown in FIG.
In this synthesis method, first, a divinyl ether 3 is reacted with a living block polymer of an alkyl vinyl ether to produce a star polymer 8. Next, vinyl ether having an ester side chain is reacted with the star polymer 8 to obtain a precursor star polymer 9. Then, the side chain is hydrolyzed to produce the amphiphilic heteroarm star polymer 10.

As the oil dye contained in the ink, for example, a monoazo dye, a disazo dye, a metal complex salt type monoazo dye, an anthraquinone dye, a phthalocyanine dye, a triallylmethane dye, and the like can be used. Specifically, for example, CISolvent Black # 3, #
5, # 7, # 22, # 23, # 27, # 29, # 34,
# 123, CISolvent Blue # 2, # 11, # 12,
# 25, # 35, # 36, # 38, # 55, # 70, #
73, CISolvent Red # 1, # 3, # 8, # 23, #
24, # 25, # 27, # 30, # 49, # 81, # 8
2, # 83, # 84, # 100, # 109, # 118,
# 121, # 122, # 132, # 179, # 218,
CISolvent Yellow # 2, # 6, # 14, # 15, #
16, # 19, # 21, # 33, # 45, # 56, # 6
1, # 77, # 80, # 82, # 149, # 151, C.I.
I.Solvent Green # 3, CISolvent Orange # 1, #
2, # 6, # 14, # 37, # 40, # 44, # 45,
CISolvent Violet # 8, # 13, # 14, # 21,
One or a combination of two or more of # 27 and the like can be used.

Example Next, a specific example will be described.

First, 21 kinds of inks for ink-jet recording having the following compositions (the numerical values of percentages are mass percentages) were produced (Examples 1 to 21).

(Example 1) CISolvent Black # 3 ... 3% Glycerin ... 10% Diethylene glycol monobutyl ether ... 10% Amphiphilic star-shaped block polymer (of the formula 7) ... 2% Pure water ... 75% (Example 2) CISolvent Blue # 2 ... 3% Glycerin ... 10% Diethylene glycol monobutyl ether ... 10% Amphiphilic star block polymer (of formula 7) ... 2% Pure water ... 75% (Example 3) CISolvent Red # 1 ... 3 % Glycerin ... 10% Diethylene glycol monobutyl ether ... 10% Amphiphilic star-shaped block polymer (of the chemical formula 7) ... 2% Pure water ... 75% (Example 4) CISolvent Yellow # 2 ... 3% Glycerin ... 10% Diethylene glycol mono Butyl ether: 10% amphiphilic star-shaped block polymer (chemical formula 7 2% Pure water 75% (Example 5) CISolvent Black # 5 3% Glycerin 10% Diethylene glycol monobutyl ether 10% Amphiphilic heteroarm star polymer (of formula 10) 2% Pure water: 75% (Example 6) CISolvent Blue # 11: 3% Glycerin: 10% Diethylene glycol monobutyl ether: 10% Amphiphilic hetero arm star polymer (of chemical formula 10): 2% Pure water: 75% ( Example 7) CISolvent Red # 3 3% Glycerin 10% Diethylene glycol monobutyl ether 10% Amphiphilic heteroarm star polymer (of formula 10) 2% Pure water 75% (Example 8) CISolvent Yellow # 6: 3% Glycerin: 10% Diethylene glycol monobutyl ether: 10% Amphiphilic heteroarm star polymer (of formula 10) 2% pure water 75% (Example 9) CISolvent Black # 7 3% glycerin 10% diethylene glycol monobutyl ether 10% amphiphilic star block Polymer (star-shaped polymer of formula 7 in which the isopropyl group is changed to an n-hexyl group) 2% pure water 75% (Example 10) CISolvent Blue # 12 3% glycerin 10% diethylene glycol monobutyl ether 10 % Amphiphilic star-shaped block polymer (star-shaped polymer of formula 7 in which the isopropyl group is changed to n-hexyl group) 2% pure water 75% (Example 11) CISolvent Red # 8 3% glycerin 10% diethylene glycol monobutyl ether ... 10% amphiphilic star-shaped block polymer (chemical formula 7 2% pure water ... 75% (Example 12) CISolvent Yellow # 14 ... 3% glycerin ... 10% diethylene glycol monobutyl ether ... 10% Amphiphilicity Star block polymer (the star polymer of Formula 7 in which the isopropyl group is replaced with an n-hexyl group) 2% pure water 75% (Example 13) CISolvent Black # 22 3% glycerin 10% diethylene glycol mono Butyl ether 10% Amphiphilic heteroarm star polymer (star-shaped polymer of formula 10 with isopropyl group changed to n-hexyl group) 2% pure water 75% (Example 14) CISolvent Blue # 25 ... 3% Glycerin ... 10% Diethylene glycol monobutyl ether ... 10% Amphiphilic hetero Star polymer (in which the isopropyl group of the star polymer of Formula 10 is changed to an n-hexyl group) 2% pure water 75% (Example 15) CISolvent Red # 23 3% glycerin 10% Diethylene glycol monobutyl ether: 10% Amphiphilic heteroarm star polymer (the isopropyl group of the star polymer of formula 10 is changed to n-hexyl group): 2% pure water: 75% (Example 16) CISolvent Yellow # 15 3% glycerin 10% diethylene glycol monobutyl ether 10% Amphiphilic star-shaped block polymer (star-shaped polymer of formula 10 in which isopropyl groups are changed to n-hexyl groups) 2% pure water 75 % (Example 17) CISolvent Black # 3 ... 3% Glycerin ... 10% Diethylene glycol monobutyl acrylate Ter 20% amphiphilic star block polymer (of formula 7) 2% pure water 65% (Example 18) CISolvent Black # 3 3% glycerin 10% diethylene glycol monobutyl ether 30% amphiphilic Star block polymer (of formula 7) 2% pure water 55% (Example 19) CISolvent Black # 3 3% glycerin 10% diethylene glycol monobutyl ether 10% amphiphilic star block polymer (formula 7) ) 2% fluorinated surfactant (trade name "FC-93", manufactured by 3M) ... 1% pure water ... 74% (Example 20) CISolvent Black # 3 ... 3% glycerin ... 10% diethylene glycol mono Butyl ether: 5% Amphiphilic star-shaped block polymer (of formula 7): 2% Pure water: 80% (implementation 21) CISolvent Black # 3 ... 3% Glycerin ... 10% Diethylene glycol monobutyl ether ... 2% Amphiphilic star-shaped block polymer (of formula 7) ... 2% Pure water ... 83% Use plain paper (trade name "Xerox 402") with a commercially available printer.
4 ": manufactured by Xerox Corporation). As a result, no bleeding was observed in the print and the image, and a recorded matter of high print quality and high image quality was obtained. In addition, no strikethrough of the ink occurred on the paper, and clear printing and images were obtained even when double-sided printing was performed.

After the recorded paper was immersed in pure water, it was allowed to dry at room temperature, and the state of the dried ink was observed (water resistance test). As a result, the above Examples 1 and 2
No bleeding was observed for any of the inks of No. 1,
It was confirmed that these inks had high water resistance.

Each of the inks of Examples 1 to 21 was
The ink was allowed to stand for 3 months in an atmosphere of 0 ° C., and then the state of the ink was observed (stability test). As a result, no aggregation or precipitation was observed for any of the inks. This confirmed that the inks of Examples 1 to 21 had high stability.

As comparative examples, the following inks of Comparative Example 1 (see JP-A-10-140055), inks of Comparative Example 2 (see JP-A-2000-154341), and inks of Comparative Example 3 (the above-described Polymer Preprints) were used. , Japan Vo
l.49, No.1 (2000) pp.22-24), we examined ink bleeding, ejection performance, stability, etc.

(Comparative Example 1) CISolvent Black # 27: 4% Styrene-acrylic acid copolymer: 11% Polyoxyethylene oxypropylene having a number average degree of polymerization of oxyethylene of 60 and a number average degree of polymerization of oxypropylene of 45 Polyether polyol of block copolymer and glycerin Water-soluble acrylic resin emulsion: 74% Water-soluble acrylic resin emulsion (John Krill J-61; manufactured by Johnson KK): 6% Triethylene glycol monobutyl ether: 5% ( Comparative Example 2 The ink of Comparative Example 2 was produced as follows. That is, first, sodium dodecyl sulfate 2
g, 4 g of New Frontier S510, 1 deionized water
94 g, and 10 g of n-butoxymethylacrylamide
Was charged into a flask, and the liquid temperature was raised to 50 ° C. while stirring under a nitrogen stream. Next, 5 g of an ethanol solution containing 0.5 g of V-70 (manufactured by Wako Pure Chemical Industries, oil-soluble azo-based polymerization initiator) was poured into the flask, and then a monomer solution having the following composition was added for 2 hours. And dropped. Then, after stirring at the same temperature for 4 hours, the mixture was cooled to room temperature to obtain an ink composed of a colored resin emulsion (ink of Comparative Example 2).

Composition of monomer solution: n-butoxymethylacrylamide: 89 g Ethylene glycol dimethyl methacrylate: 1 g Savinyl blue GLS (manufactured by Clariant, phthalocyanine blue dye): 6.3 g Savinyl blue RS (manufactured by Clariant) Anthraquinone blue dye) 18.7 g (Comparative Example 3) CISolvent Red # 27 3% Amphiphilic star block polymer (of chemical formula 7) 2% Pure water 95% In the ink of Comparative Example 1, 25% 9800 viscosity
It was as high as mPa · s, and printing was not possible with a commercially available inkjet printer.

With the ink of Comparative Example 2, 25 ° C.
Was 5 mPa · s, and printing could be performed with a commercially available inkjet printer. However, when the printer was left standing for 24 hours and then operated again, no ink was ejected. When the ink of Comparative Example 2 was placed in a sealed container and left in an atmosphere of 70 ° C. for 3 weeks, a part of the ink was observed to coagulate, and the viscosity was increased to 1000 mPa · s.

With the ink of Comparative Example 3, when printed with a commercially available ink jet printer, characters and images blurred, and the recorded matter could not be read at all. In addition, the ink penetrated.

Accordingly, it was found that, unlike the inks of Examples 1 to 21, the inks of Comparative Examples 1 to 3 were unsuitable for ink jet recording.

Examples 1 to 21 and Comparative Examples 1 to 3
Table 1 shows the measurement results of the surface tension and the viscosity of the ink. Table 1 also shows that the inks of Examples 1 to 21 are suitable for inkjet recording.

[0050]

[Table 1]

The solvent for the ink according to the present invention preferably has a surface tension of 20 to 50 mN / m. In Table 1,
The surface tension of the solvent of the ink is also shown.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an ink jet recording apparatus according to an embodiment.

FIG. 2 is a schematic view of an amphiphilic star-shaped block polymer according to an embodiment.

FIG. 3 is a schematic diagram of an amphiphilic heteroarm star polymer according to an embodiment.

FIG. 4 is a schematic diagram of an amphiphilic star-shaped block polymer according to a comparative example.

FIG. 5 is a schematic view of a star polymer according to a comparative example.

FIG. 6 is a schematic view of a star polymer according to a comparative example.

FIG. 7 is a diagram showing a method for synthesizing a star polymer.

FIG. 8 is a diagram illustrating a method for synthesizing an amphiphilic star-shaped block polymer according to an embodiment.

FIG. 9 is a diagram illustrating a method for synthesizing an amphiphilic heteroarm star polymer according to an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Ink jet head 12 Carriage 13 Carriage shaft 14 Recording paper 15 Conveying roller 16 Hydrophilic segment 17 Hydrophobic segment 18 Microgel 19 Oil dye molecule 20 Ink jet recording apparatus 21 Ink cartridge

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyuki Matsuo 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 2C056 FC01 2H086 BA56 BA59 BA60 BA61 4J039 AD17 BC07 BC13 BC39 BC60 BE07 BE12 BE22 CA06 EA38 EA42 EA44 EA47 GA24

Claims (8)

[Claims] 1. An oil-based dye, a wetting agent, a penetrant, water, and an amphiphilic star block polymer having a hydrophilic outer surface, and having a surface tension at 25 ° C. of 20 to 50 mN / m.
Ink for inkjet recording. 2. The viscosity at 25 ° C. of 1 to 10 mPa ·
The ink for inkjet recording according to claim 1, which is s. 3. An oil-based dye, a wetting agent, a penetrant, water, and an amphiphilic star block polymer having a hydrophilic outer surface, and having a surface tension at 25 ° C. of 20 to 50 mN / m.
An ink cartridge comprising the ink jet recording ink. 4. An oil-based dye, a wetting agent, a penetrant, water, an amphiphilic star block polymer having a hydrophilic outer surface, and having a surface tension at 25 ° C. of 20 to 50 mN / m.
A recording apparatus, comprising: an ink jet recording ink according to any one of claims 1 to 3, and recording by discharging the ink jet recording ink onto a recording medium. 5. An oil-based dye, a wetting agent, a penetrant, water, and an amphipathic heteroarm star polymer.
An inkjet recording ink having a surface tension at 5 ° C of 20 to 50 mN / m. 6. A viscosity at 25 ° C. of 1 to 10 mPa ·
The ink for inkjet recording according to claim 5, which is s. 7. An oily dye, a wetting agent, a penetrant, water, and an amphipathic heteroarm star polymer,
An ink cartridge comprising an inkjet recording ink having a surface tension at 5 ° C. of 20 to 50 mN / m. 8. An oily dye, a wetting agent, a penetrant, water, and an amphipathic heteroarm star polymer,
A recording apparatus, comprising: an inkjet recording ink having a surface tension at 5 ° C. of 20 to 50 mN / m, and performing recording by discharging the inkjet recording ink onto a recording medium.