JP2000178486A - Disperse dye ink for ink-jet printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dispense dye ink causing noclogging at a nozzle, having good preservation stability, and also capable of providing excellent printing quality by using a specific amphiphatic compound in combination with a styrene- acrylic acid salt copolymer as a dispersing agent. SOLUTION: This disperse dye ink contains (A) a disperse dye, (B) an amphiphatic compound having a polyethylene oxide with 30-80 polymerization degree as a hydrophilic part, and an alkylphenyl group as a hydrophobic part, (C) a styrene-acrylic acid salt copolymer, and (D) an aqueous solvent. The particle diameter of the component A is preferably 10-100 nm. The alkyl of the alkylphenyl group of the component B is preferably a 5-15C alkyl. The component B is, for example, represented by the formula (R is a 5-15C alkyl; n is 30-80). The molecular weight of the component C is preferably 5,000-30,000. Preferably, the proportion of the used component A is 1-10 wt.%, and that of the total of the added components B and C is 0.1-10 wt.% based on the whole amount of the ink composition. The viscosity of the ink at 25 deg.C is preferably <=5 cP.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disperse dye ink for ink jet. More specifically, the present invention relates to a disperse dye ink for inkjet using two specific dispersants in combination.

[0002]

2. Description of the Related Art In recent years, a system for performing plateless printing by an ink jet has been proposed, and a printing method by an ink jet system is also used for printing a cloth. Compared with a conventional printing method using screen printing or the like, a printing method using an ink jet method has various advantages such as resource saving, energy saving, and easy high-definition expression in addition to plateless printing.
A hydrophobic fiber cloth such as a polyester fiber is dyed with a water-insoluble disperse dye. Therefore, in order to print these cloths by the inkjet method, it is necessary to obtain a stable inkjet disperse dye ink by dispersing water-insoluble disperse dyes into fine particles in water.

Conventionally, a technique for dispersing a disperse dye in an aqueous solvent has been known. Representative dispersants for aqueous dispersion of disperse dyes include, for example, formalin condensate of naphthalene sulfone acid, lignin sulfonate and the like. All are used for the dispersion method industrially performed in the existing dyeing method. However, these methods cannot efficiently and stably obtain a fine particle dispersion used for ink jet. In conventional printing methods, such a level of fine particles was not required.

As a dispersant used in a disperse dye ink for ink jet, for example, JP-A-9-71742 discloses a sulfate having a specific structure containing ethylene oxide. A polyoxyalkylphenyl sulfate having a specific structural formula is disclosed as a dispersant for a pigment that is hardly soluble in water. Further, JP-A-8-14
In 3802, a water-soluble organic solvent containing polyethylene oxide having a weak surface activity for a disperse dye ink is used. However, in the case of ink in which a disperse dye is dispersed,
The degree of polymerization of ethylene oxide of any of the substances used for these is 20 or less, and the steric repulsion caused by polyethylene oxide when these substances are adsorbed on the surface of the disperse dye is not sufficient, and the disperse dye It is considered that the contribution to the dispersion stability is small. Therefore, even when these substances are used, dispersion of the disperse dye is insufficient, and there has been no solution to nozzle clogging or dispersion stability.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disperse dye ink for ink jet which has no clogging of nozzles, has good storage stability, and has excellent printing quality.

[0006]

The disperse dye ink for ink-jet recording of the present invention comprises a disperse dye and a hydrophilic portion having a degree of polymerization of 30.
A disperse dye ink comprising an amphiphilic compound containing at least 80 but not more than polyethylene oxide and a hydrophobic part of which is an alkylphenyl group, a styrene / acrylate copolymer, and an aqueous solvent.

The present invention provides two types of dispersants, an amphipathic compound in which a hydrophilic portion contains polyethylene oxide having a degree of polymerization of 30 or more and 80 or less and a hydrophobic portion is an alkylphenyl group, and a styrene / acrylate copolymer. Is a disperse dye ink. A stable dispersion of a disperse dye cannot be obtained only with an amphiphilic compound or a styrene / acrylate copolymer alone. The degree of polymerization of polyethylene oxide contained in the amphiphilic compound of the present invention is 30 or more and 80 or more.
Otherwise, the effects of the present invention cannot be obtained. According to our findings, the disperse dye has no functional groups on the surface of the dye particles, so the surface of the dye particles and the amphiphilic compound, styrene / acrylate copolymer have to disperse the disperse dye. Interaction with hydrophobic groups becomes important. The amphiphilic compound of the present invention, the styrene-acrylate copolymer, is adsorbed by the hydrophobic part interacting with the disperse dye particles, weakens the cohesive force of the disperse dye particles, and improves the dispersion stability of the dye particles. Higher inks can be obtained. Accordingly, it is possible to uniformly disperse the fine particle-dispersed dye particles with a low viscosity, and it is possible to provide a disperse dye ink which is excellent in print quality and ink storage stability and does not cause nozzle clogging in a print head.

The mechanism by which the amphiphilic compound and the styrene-acrylate copolymer of the present invention exhibit the above-mentioned effects is not clear, but water or a mixed solvent of water and an organic solvent which is a common solvent in disperse dyes is not known. In an aqueous solvent consisting of
The hydrophobic portion of the amphiphilic compound of the present invention and the styrene / acrylate copolymer is strongly adsorbed on the surface of the disperse dye particles, and is caused by polyethylene oxide which is a hydrophilic portion of the amphiphilic compound. It is speculated that cohesion between disperse dyes may be reduced by two types of repulsion: steric repulsion and electrostatic repulsion caused by the acrylate unit of the styrene-acrylate copolymer. . It is considered important that these two types of repulsion exist. A similar effect cannot be obtained only by the steric repulsion caused by polyethylene oxide or only the electrostatic repulsion caused by the acrylate unit. In addition, the styrene / acrylate copolymer is in a state in which the styrene unit is strongly adsorbed on the surface of the disperse dye, and has an effect of reducing the cohesive force between the disperse dyes due to the electrostatic repulsion caused by the acrylate unit. .

The amphiphilic compound of the present invention contains polyethylene oxide in the hydrophilic part, and the degree of polymerization of this polyethylene oxide must be in the range of 30 to 80. When the degree of polymerization is 30 or more, the cohesive force between disperse dyes can be prevented from increasing due to steric repulsion. Further, when the degree of polymerization is 80 or less, it is possible to prevent the solubility in water from becoming too high, and it is possible to reduce the proportion of the amphipathic compound that exists free in the solution.

[0010] In the amphiphilic compound of the present invention, the alkyl group of the alkylphenyl ether in the hydrophobic portion preferably has 5 to 15 carbon atoms. This is to prevent the hydrophobicity from becoming weak and the adsorbability to the surface of the disperse dye particles from being lowered, and to prevent the solubility in water from becoming too low and the viscosity from increasing.

Since most disperse dyes generally contain an aromatic ring, the interaction between the aromatic ring of the alkylphenyl ether of the amphiphilic compound of the present invention and the aromatic ring or heterocyclic ring present in the dye causes It is considered that the amphiphilic compound is strongly adsorbed to the disperse dye particles and effectively reduces the cohesive force between the disperse dyes.

The amphiphilic compound of the present invention may be any compound as long as it has the above-mentioned characteristics, but a typical structure is shown in (Chemical Formula 1).

[0013]

Embedded image

In the formula (1), R represents an alkyl group having 5 to 15 carbon atoms, and n represents an integer of 30 to 80. The acrylate of the styrene / acrylate copolymer of the present invention may be, for example, a metal salt such as sodium or an ammonium salt.

[0015] The styrene-acrylate copolymer of the present invention comprises a styrene-acrylate salt as a main component, even if a third component is present in the styrene-acrylate copolymer. It does not affect the effect of. For example, methyl (meth) acrylate, ethyl (meth) acrylate,
Examples include n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, α-methylstyrene, t-butylstyrene, and 4-vinylpyridine.

The molecular weight of the styrene / acrylate copolymer of the present invention is more preferably in the range of 5,000 ≦ m ≦ 30,000. This is to reduce the cohesive force between the disperse dyes due to the electrostatic repulsion, while preventing the formation of coarse particles which are adsorbed and aggregated on a plurality of disperse dye particles.

The sum of the amounts of the styrene / acrylate copolymer of the present invention and the amphipathic compound is 0.1 to 20% by weight, preferably 0.1 to 10% by weight, based on the total ink composition. When the content is within this range, the viscosity of the disperse dye ink can be reduced, and the dispersibility and dispersion stability of the disperse dye particles can be increased.

In the present invention, water or a mixed solvent of water and a compound for the purpose of preventing wetting or clogging of nozzles is used as the aqueous solvent. Examples of the compound include ethylene glycol, diethylene glycol, glycerin, triethylene glycol, tripropylene glycol, dimethyl sulfoxide, diacetone alcohol, glycerin monoallyl ether, propylene glycol, polyethylene glycol, thiodiglycol, N
-Methyl-2-pyrrolidone, 2-pyrrolidone, γ-butyrolactone, 1,3-dimethyl-2-imidazolidinone, sulfolane, trimethylolpropane, neopentyl glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene Glycol monoallyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, β-dihydroxyethyl urea,
Urea, acetonylacetone, pentaerythritol, hexylene glycol, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol monophenyl ether, diethylene glycol diethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, Triethylene glycol monobutyl ether,
Triethylene glycol dimethyl ether, triethylene glycol diethyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl Ether, glycerin monoacetate, glycerin diacetate, glycerin triacetate, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, cyclohexanol, 1-butanol, 2,5-hexanediol, ethanol, n-propanol, 2
-Propanol, 1-methoxy-2-propanol, furfuryl alcohol, tetrahydrofurfuryl alcohol, 1,2 butanediol, 1,4-butanediol, 1,3-butanediol, 2,4-pentanediol, 1,5-pentanediol, 2-methyl-2,4-pentanediol, 1,2-cyclohexanediol,
1,4-cyclohexanediol, trimethylolethane, trimethylolpropane, 1,2,4-butanetriol, 1,2,6-hexanetriol, 1,2,5
-Pentanetriol, 3-methyl-1,5-pentanediol, 3-hexene-2,5-diol, acetone, methyl ethyl ketone, tetrahydrofuran, dioxane, ethyl acetate, propylene carbonate, dimethyl sulfoxide, dimethylformamide and the like.

The disperse dye ink of the present invention can suppress foaming of the ink by adding acetylenic glycol. The disperse dye ink contains at least a disperse dye and a polyethylene oxide in a hydrophilic portion, and has a hydrophobic property. A mixed liquid containing an amphiphilic compound in which a part is an alkylphenyl group, a styrene / acrylate copolymer, and an aqueous solvent is dispersed, and various additives are added as needed to form an ink. It is also possible to first prepare a dispersion having a high concentration of the disperse dye, dilute it with a solvent, various additives, and the like, and use it as an ink.

The disperse dye of the present invention comprises cyan, magenta,
Yellow, red, green, blue, violet,
A conventionally known disperse dye such as orange is used without any distinction.

As the green disperse dye, for example, CIDi
sperse Green 6: 1 and CI Disperse Green 9.

Examples of the blue disperse dye include CIDisp
erse Blue 56, CIDisperse Blue60, CIDisperse Bl
ue 73, CIDisperse Blue 87, CIDisperse Blue 11
3, CI Disperse Blue 128, CI Disperse Blue 143, C.
And I. Disperse Blue 165.

Examples of violet disperse dyes include C.I.
I. Disperse Violet 33 and the like.

Examples of red disperse dyes include CIDisp
erse Red 54, CIDisperse Red 72, CI Disperse Re
d86, CIDisperse Red 92, CIDisperse Red 111,
CIDisperse Red 126, CIDisperse Red 135, CIDi
sperse Red 145, CIDisperse Red 164, CIDisperse
Red 181, CIDisperse Red 221, CIDisperse Red34
8 and the like.

Examples of the orange disperse dye include CIDi
sperse Orenge 13, CIDisperse Orenge 29, CIDi
sperse Orenge 49, CIDisperse Orenge 66, CIDisp
erseOrenge 119 and the like.

Examples of the yellow disperse dye include CIDi
sperse Yellow 5, CIDisperse Yellow 42, CIDispe
rse Yellow 54, CIDisperse Yellow 79, CIDispers
e Yellow 83, CIDisperse Yellow 99, CIDisperse
Yellow 119, CIDisperse Yellow 126, CIDisperse
Yellow 160, CIDisperse Yellow 198, CIDisperse
Yellow 224 and the like.

The disperse dye used in the present invention is not limited to these, and may be a newly synthesized one. A mixture of a plurality of these disperse dyes is also used.
The disperse dye can be used in either a dry state or a wet state.

The particle diameter of the disperse dye in the disperse dye ink of the present invention is preferably 100 nm or less and 10 nm or more. Using fine particles of 100nm or less, the dispersion stability is ensured, the formation of coarse particles is prevented, the specifications caused by the coarse particles of the disperse dye during printing (small spots appearing on cloth), tarification (tar-like Secondary aggregates of the dye to the fibers) can be prevented. When the thickness is 10 nm or more, it is possible to prevent the viscosity from increasing due to an increase in the number of particles in a unit volume, thereby preventing the dispersion stability from being hindered.

The use amount of the disperse dye of the present invention is preferably from 0.1 to 20% by weight, more preferably from 1.0 to 10% by weight, based on the whole ink composition. When it is within this range, the color tone and optical density of the ink can be satisfied, and the viscosity and dispersion stability of the disperse dye can be satisfied.

The surface tension of the disperse dye ink obtained in the present invention is preferably 20 to 70 dyne / cm. Also, 25
The viscosity at ° C is preferably 10 cp or less. A more preferred range is 5 cp or less. By having the above-mentioned surface tension and viscosity, the disperse dye ink obtained in the present invention can be stably printed by an inkjet printer.

As the dispersing machine for producing the fine particle-dispersed dye ink of the present invention, any dispersing machine may be used as long as it is a commonly used dispersing machine. For example, a container driving medium mill such as a roll mill, a ball mill, a centrifugal mill and a planetary ball mill, And a medium stirring mill such as a stirring tank type mill. As a specific method for producing a fine particle-dispersed dye ink, there is a method of dispersing the ink using a planetary ball mill or a sand mill using ceramic beads having a particle diameter of 0.01 to 1.0 mm. In this case, the acceleration is preferably 5 to 50 G for a planetary ball mill, and 50 to 90% for a ceramic bead at a peripheral speed of 5 to 20 m / s for a sand mill.

In the present invention, an anti-clogging agent for a print head, an antifoaming agent for ink, an anti-drying agent, a bactericide, a humectant,
Various additives conventionally used in ink-jet printer inks such as a pH adjuster and a water-resistance imparting agent for printing can be used in combination.

The disperse dye ink for inkjet of the present invention is printed on a hydrophobic fiber cloth such as polyester. The inkjet printer can be selected from various types of continuous type and on-demand type (piezo type, thermal type) printers as needed.

If necessary, the cloth to be printed may be subjected to a pretreatment with a printing paste or the like before printing. Further, the printed fabric may be colored by heating, and then, if necessary, may be subjected to post-treatment such as reduction cleaning.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to specific examples.

[0036]

Examples (Example 1) Disperse dye (CI Disperse Blue 60) 10 parts by weight Amphiphilic compound (Nonypol 400 manufactured by Sanyo Chemical Industries) (degree of polymerization of ethylene oxide: 40) 4 parts by weight Styrene / acrylate salt 1 part by weight of a polymer (manufactured by Johnson Polymer, Joncryl 62) 1 part by weight of acetylenic glycol 1 part by weight of ion-exchanged water 84 parts by weight The above composition was pulverized by a planetary ball mill for 30 hours, and then dispersed to obtain a dispersion A.

Dispersion A 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Example 2 13 parts by weight of disperse dye (CI Disperse Red 73) Amphiphilic compound (Nonipol 700 manufactured by Sanyo Chemical Industries) (polymerization degree of ethylene oxide: 70) 6 parts by weight Styrene / acrylate copolymer (Johncryl 62, manufactured by Johnson Polymer) 1 part by weight Acetylenic glycol 0.5 part by weight Ion-exchanged water 79.5 parts by weight The above composition was ground by a planetary ball mill for 30 hours and then dispersed to obtain a dispersion B.

Dispersion B 50 parts by weight Diethylene glycol 5 parts by weight 1.5 pentanediol 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Example 3 10 parts by weight of disperse dye (CI Disperse Yellow 64) Amphiphilic compound (Nonipol 700 manufactured by Sanyo Chemical Industries) (polymerization degree of ethylene oxide: 70) 10 parts by weight styrene / acrylate copolymer 2 parts by weight (John Krill 62, manufactured by Johnson Polymer) 1.5 parts by weight of acetylenic glycol 76.5 parts by weight of ion-exchanged water The above composition was pulverized by a planetary ball mill for 30 hours, and then dispersed to obtain a dispersion C.

Dispersion C 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Example 4 Disperse Dye (CI Disperse Orange 29) 10 parts by weight Amphipathic compound (Nonipol 400 manufactured by Sanyo Chemical Co., Ltd.) (polymerization degree of ethylene oxide: 40) 4 parts by weight Styrene / acrylic acid copolymer Combined (Johnson polymer 61J) 1 part by weight Acetylene glycol 1.5 parts by weight 83.5 parts by weight ion-exchanged water The above composition is dispersed in a planetary ball mill for 30 hours to obtain a dispersion D.
I got

Dispersion D 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Example 5 Disperse Dye (CI Disperse Violet 26) 10 parts by weight Amphiphilic compound (Octapol 400 manufactured by Sanyo Chemical Co., Ltd.) (polymerization degree of ethylene oxide: 40) 4 parts by weight Styrene / acrylic acid copolymer Combined (Johnson Polymer 61J) 1 part by weight Acetylene glycol 1.5 parts by weight Ion-exchanged water 83.5 parts by weight The above composition is dispersed in a planetary ball mill for 30 hours to obtain a dispersion E.
I got

Dispersion E 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Comparative Example 1 Disperse Dye (CI Disperse Red 73) 10 parts by weight Formalin condensate of sodium naphthalenesulfonate (manufactured by Kao, Demol N) 10 parts by weight Amphiphilic compound (Nonipol 700 manufactured by Sanyo Chemical) (ethylene) Oxide polymerization degree: 70) 2 parts by weight Acetylene glycol 0.9 parts by weight Ion-exchanged water 77.1 parts by weight The above composition was pulverized by a planetary ball mill for 30 hours, and then dispersed to obtain a dispersion F.

Dispersion F 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

(Comparative Example 2) Disperse dye (CI Disperse Blue 60) 13 parts by weight Amphiphilic compound (Nonipol 700 manufactured by Sanyo Chemical Industries) (polymerization degree of ethylene oxide: 70) 7 parts by weight Acetylene glycol 0.5 parts by weight 79.5 parts by weight of ion-exchanged water The above composition was pulverized by a planetary ball mill for 30 hours and then dispersed to obtain a dispersion G.

Dispersion G 50 parts by weight Diethylene glycol 5 parts by weight 1.5 pentanediol 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

Comparative Example 3 Disperse Dye (CI Disperse Yellow 64) 10 parts by weight Styrene / acrylate copolymer (manufactured by Johnson Polymer, Joncryl 62) 10 parts by weight Acetylene glycol 1.5 parts by weight Ion-exchanged water 78.5 parts by weight The above composition was pulverized with a planetary ball mill for 30 hours, and then dispersed to obtain a dispersion H.

Dispersion H 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

(Comparative Example 4) Disperse dye (CI Disperse Orange 29) 10 parts by weight Amphiphilic compound (Nonipol 100 manufactured by Sanyo Chemical Industries) (degree of polymerization of ethylene oxide: 10) 4 parts by weight Styrene / acrylate copolymer Combined (Johnson Polymer 61J) 1 part by weight Acetylene glycol 1.5 parts by weight 83.5 parts by weight ion-exchanged water The above composition is dispersed in a planetary ball mill for 30 hours to obtain a dispersion liquid I.
I got

Dispersion I 50 parts by weight Diethylene glycol 5 parts by weight Polyethylene glycol (molecular weight 200) 10 parts by weight Deionized water 35 parts by weight After mixing with the above composition, a disperse dye ink for inkjet was prepared.

(Particle Size, Viscosity) The particle size of the disperse dye was measured using a centrifugal sedimentation type particle size distribution meter (manufactured by Shimadzu Corporation, SA-CP4), and the viscosity of the disperse dye ink was measured using a viscometer (manufactured by Toki Sangyo, R100 type). 25 using
Measured in ° C.

(Nozzle clogging test) Nozzle clogging was measured by an inkjet printer (MJ-510, manufactured by Epson).
After printing a certain amount of characters using C), leave it at 50 ° C for 7 days without capping, then perform a cleaning scan to recover nozzle clogging. I decided.

[0056] (Storage Stability Test) The inks obtained in the respective Examples and Comparative Examples were subjected to a storage stability test at 60 ° C. for 2 weeks, and changes in viscosity and particle size were evaluated before and after the storage stability test.

Evaluation Rank: Changes in viscosity and particle size before and after the storage stability test are within ± 10%: ○ Within ± 15%: Δ ± 20% or more: × (Printing test) In each of Examples and Comparative Examples. Using the obtained ink, an inkjet printer (manufactured by Epson,
MJ-510C) was used to print on A4 size polyester cloth. After printing, it was heated in a steam at 180 ° C. for 8 minutes, and subjected to a conventional washing treatment to obtain a printed material. The leveling property of the obtained printed matter was visually evaluated and evaluated.

Evaluation rank 〇: There is no coloring unevenness (spec, tar, etc.) in the printed portion, and it is clear. Δ: There is uneven coloring of the printed portion, and the image is distorted or blurred.

×: There is uneven coloring of the printed portion, and the blur and blur are conspicuous. Table 1 shows the following evaluation results.

[0060]

[Table 1]

As is evident from Table 1, the disperse dye ink for ink jet of the present invention has fine disperse dye particles, has no nozzle clogging, has good storage stability, and has excellent print quality. You can see that it is.

[0062]

The disperse dye ink for inkjet according to the present invention has fine disperse dye particles, has no nozzle clogging, has good storage stability, and has excellent printing quality.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shoji Nishihara 1-88 Ushitora, Ibaraki-shi, Osaka F-term in Hitachi Maxell, Ltd. (Reference) 4J039 AD03 AD09 AD10 AE07 AF07 BC07 BC09 BC12 BC13 BC20 BC31 BC36 BC50 BC55 BE08 BE12 BE22 CA06 EA41 EA42 EA44 FA03 GA24

Claims (5)

[Claims] 1. A disperse dye having a degree of polymerization of 30 to 80 in a hydrophilic portion.
A disperse dye ink for inkjet, comprising: an amphipathic compound containing the following polyethylene oxide, wherein the hydrophobic portion is an alkylphenyl group; a styrene / acrylate copolymer; and an aqueous solvent. 2. The disperse dye ink for inkjet according to claim 1, wherein the alkyl group of the alkylphenyl group of the amphiphilic compound has 5 to 15 carbon atoms. 3. The disperse dye ink for inkjet according to claim 1, wherein the molecular weight of the styrene / acrylate copolymer is in the range of 5,000 ≦ m ≦ 30,000. 4. The disperse dye ink according to claim 1, wherein the disperse dye has a particle size of 100 nm or less. 5. The disperse dye ink for inkjet according to claim 1, which has a viscosity of 10 cp or less at 25 ° C.