JPH08295824A - Ink for ink jet fabric printing and printing of fabric using the same - Google Patents

Abstract

PURPOSE: To obtain an ink, having excellent color developing properties and image quality for a cellulosic fibrous structure and excellent in preservation stability and discharge stability without any problems in clogging of ink heads by selecting a specific reactive dye. CONSTITUTION: This ink comprises a reactive dye, water and, as necessary, an organic solvent. Furthermore, the ink uses a monoazo dye of formula I (Q1 is a group eliminative by actions of an alkali) in the form of a free acid or preferably further a monoazo dye mixture containing (B) 1-99wt.% monoazo dye of formula II in the form of a free acid and (C) 1-99wt.% monoazo dye of formula III in the form of a free acid or a mixture containing 80-99wt.% component (B) and (D) 1-20wt.% monoazo dye of formula IV as the dye. Furthermore, (D) a formaldehyde condensate of naphthalenesulfonic acid which may be alkylated is preferably contained in an amount of 1-100 pts.wt. based on 100 pts.wt. mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has excellent coloring properties and image quality for fibers including natural cellulose fibers and regenerated cellulose fibers, yarns, knitted woven fabrics and non-woven fabrics (hereinafter referred to as cellulosic fiber structures). In addition, the present invention relates to an inkjet printing ink which is free from clogging of an ink head and has excellent storage stability and ejection stability, and a method of printing a cloth by an inkjet method using the ink.

[0002]

2. Description of the Related Art Generally, a screen printing method, a roller printing method, a rotary screen printing method, a transfer printing method or the like is used as a method for forming an image on fabrics. However, in recent years, there has been an active movement to apply and develop the inkjet recording method for fabrics, which has made remarkable progress as a paper application for these printing methods.

This is because the current printing method requires complicated and long time such as tracing for each pattern, plate making, (making screen frame, engraving roller, transfer paper, etc.), great labor and cost, which is equivalent to that. It is impossible to keep up economically without the production of the lot size. In addition, it has been pointed out that it is unsuitable for the production of small lots and various products due to the diversification of fashion, and in response to these problems, the current process is being replaced by an inkjet recording system.

On the other hand, the ink jet recording system has a history of being developed mainly on paper as a recording material, and as a pigment component used in an ink jet print ink for paper, direct dyes, reactive dyes, food additives are still used. It is selected from pigments. The reason why reactive dyes have not been used so much in inkjet printing inks for paper is, for example, that due to problems such as chemical stability due to having a fiber reactive group, the solubility of the dye is lowered, and crystal precipitation is caused.
The ink head may be clogged.

Ink-jet printing inks used for fabrics are required to have higher dyeing density, so-called high-density dyeing, than ink-jet printing inks for paper. That is, it is not necessary for the inkjet print ink for paper to penetrate into the inside of the paper, and it suffices to form an image so that the dye covers the surface portion of the paper. Permeation occurs and the dyeing density on the surface decreases. When a reactive dye suitable for dyeing / printing on a cellulosic fiber structure is applied to an ink for inkjet printing, a part of the reactive dye is decomposed during the dyeing operation to become an unfixed dye, as with paper, so that There is a problem such as a decrease in concentration.

Up to now, an ink jet printing method using various reactive dyes has been known as an ink jet printing ink composition for dyeing a cloth. However, solution stability due to crystal precipitation in the ink, ink head clogging, Discharge performance deterioration due to viscosity increase, solving problems such as printing quality due to ink composition change, having a practically sufficient high dyeing density comparable to conventional prints, and as an inkjet printing ink having a preferable color tone, Not always enough.

[0007]

The problem to be solved by the present invention is to provide a fiber structure containing a cellulosic fiber with excellent color developability and image quality, storage stability, and ink head clogging. It is an object of the present invention to provide an ink for ink-jet textile printing which is free from problems such as the above and has excellent ejection stability.

[0008]

Means for Solving the Problems The inventors of the present invention have made intensive studies and studies in order to develop an ink jet printing ink suitable for the above purpose, and as a result, selected a specific reactive dye to solve the above problems. Therefore, the present invention has been completed and the present invention has been completed.

That is, the present invention provides an ink for ink-jet printing comprising a reactive dye, water and, if necessary, an organic solvent, in the form of a free acid as a reactive dye, represented by the following general formula:
(I)

[0010]

[Chemical-10]

[In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] The ink for inkjet printing characterized by using the monoazo dye shown by these.

The present invention also provides the following general formula (II) in the form of a free acid as the reactive dye.

[0013]

[Chemical-11]

[Wherein Q ₁ has the above-mentioned meaning. ] The ink for inkjet printing characterized by using the monoazo dye shown by these.

In the present invention, the monoazo dye represented by the general formula (II) is used as the reactive dye in an amount of 1 to 99% by weight.
And the following general formula (III) in the form of free acid

[0016]

[Chemical-12]

[Wherein Q ₁ has the above-mentioned meaning. ] A monoazo dye mixture containing 1 to 99% by weight of the monoazo dye represented by the formula [1] is used for inkjet printing.

The present invention further provides, as the reactive dye, the following formula (II) in the form of free acid.

[Chemical-13]

[Wherein Q ₁ has the above-mentioned meaning. ] 80 to 99% by weight of a monoazo dye represented by the following general formula (IV) in the form of a free acid.

[0020]

[Chemical-14]

1 to 20% by weight of a monoazo dye represented by
It is an ink for inkjet printing characterized by using a mixture of monoazo dyes contained therein. Furthermore, the present invention provides, as the reactive dye, the following general formula (I
I)

[0022]

[Chemical-15]

[Wherein Q ₁ has the above-mentioned meaning. 1 to 99% by weight of a monoazo dye represented by the following general formula (III) in the form of a free acid.

[0024]

[Chemical-16]

[Wherein Q ₁ has the above-mentioned meaning. ] 0 to 98% by weight of a monoazo dye represented by the following general formula (IV) in the form of a free acid.

[0026]

[Chemical-17]

1 to 20% by weight of the monoazo dye represented by
It is an ink for inkjet printing characterized by using a mixture of monoazo dyes contained therein.

[0028]

[Chemical-18]

1 to 20% by weight of a monoazo dye represented by
It is an ink for inkjet printing characterized by using a mixture of monoazo dyes contained therein.

The ink-jet printing ink of the present invention will be described in more detail below. The feature of the present invention is that, in an ink jet printing ink comprising a reactive dye, water and optionally an organic solvent, a monoazo dye represented by the above general formula (I), preferably the general formula (II), is used as the reactive dye. A monoazo dye mixture selected from the group consisting of monoazo dyes represented by the general formulas (III) and / or (IV), and optionally a formaldehyde condensate of naphthalene sulfonic acid which may be alkylated. By mixing and preparing an ink using this, it is possible to provide an ink for inkjet printing having excellent storage stability, ejection stability without problems such as ink head clogging, and cellulose using these inks. Ink for inkjet printing, which imparts excellent color developability and image quality with a preferable color tone for a base fiber structure Bisore a printing method of the fabric used.

In the textile printing (dyeing) by ink jet in which ink droplets are sequentially deposited on the cloth, the present inventors can obtain a slight difference in the order of driving and the dyeing conditions depending on the combination of the dyes used. It has been found that the selection of the dye to be used is extremely important because it has a great influence on the finish of the printed material, and there is a problem that bleeding occurs especially when forming an image by adjoining or mixing colors.

General formulas (I) and (II) used in the present invention
And in the monoazo dye represented by (III), the group capable of leaving by the action of an alkali represented by Q ₁ is
Examples thereof include a sulfate ester group, a thiosulfate ester group, a phosphate ester group, an acetate ester group, and a halogen atom.

The monoazo dyes or mixtures of monoazo dyes used according to the invention are present in the free acid form or in the form of their salts, in particular the alkali metal salts and alkaline earth metal salts,
Further, sodium salt, potassium salt and lithium salt are preferable.

The monoazo dye represented by the general formula (I) used in the present invention is a known method, for example, diazotization of 2-naphthylamine-1,5-disulfonic acid to give 1- (3 '
-Or 4'-β-sulfatoethylsulfonylphenyl) -3-methyl-5-pyrazolone, which is easily obtained by coupling.

The monoazo dye represented by the general formula (IV) is obtained by dissolving the monoazo dye represented by the general formula (I) and then adding sodium carbonate in a dye solution kept at a temperature of 10 to 80 ° C. Add an alkaline agent such as
It is obtained after 10 minutes of neutralization and purification by salting out.

Further, a formaldehyde condensate of an optionally alkylated naphthalenesulfonic acid (including a salt thereof) which is optionally contained in the monoazo dye or the monoazo dye mixture of the present invention is disclosed in JP-A-51-52435, What is described in Japanese Patent Laid-Open No. 56-143257 is used.

The content of the optionally alkylated formaldehyde condensate of naphthalene sulfonic acid is preferably 1 to 100 parts by weight based on 100 parts by weight of the monoazo dye or the monoazo dye mixture.

The formaldehyde condensate of naphthalene sulfonic acid which may be alkylated is preferably a formaldehyde condensate of naphthalene sulfonic acid having 1 to 3 C _{1 to} C ₄ alkyl groups. As the alkyl group, a formaldehyde condensate of alkylnaphthalenesulfonic acid having one or two methyl groups or ethyl groups is preferably used. These optionally alkylated naphthalenesulfonic acids may be used alone or as a mixture with those having different numbers of alkyl groups.

The formaldehyde condensate of naphthalene sulfonic acid which may be alkylated preferably has a degree of sulfonation of naphthalene sulfonic acid of 50 to 150.
%, And the average degree of condensation of the optionally alkylated naphthalene sulfonic acid and the formaldehyde condensate is
It is preferably 1.1 to 3.0.

The monoazo dye or the monoazo dye mixture contained in the ink jet printing ink of the present invention further comprises a formaldehyde condensate of naphthalene sulfonic acid which may be optionally alkylated,
These can usually be easily obtained by mixing by a known method. The mixing method is not particularly limited, and may be performed in advance before being used for inkjet printing, may be mixed at the time of inkjet printing, or may be performed at the time of producing a dye.

The above-mentioned monoazo dye mixture used in the present invention can be used in combination with other dyes, if necessary, in order to obtain a desired hue. The dye to be mixed and used is not particularly limited, and generally known dyes can be used, but as a reactive group, a sulfatoethylsulfone group, a vinylsulfone group, a monochlorotriazine group, a monofluoro group is preferable. A compound having at least one or more kinds of at least one of a monopyridiniotriazine group containing a triazine group, a hydroxycarbonyl group or an aminocarbonyl group, a dichlorotriazine group, a difluoromonochloropyrimidine group, a trichloropyrimidine group, and specifically, Sumifix , Sumifix Supr
a, Remazol, Levafix, Procion, Cibacron, Basile
n, Drimarene, Kayacion, kayacelon React, and other commercially available dyes, and further, JP-A-50-17.
No. 8, JP-A-56-9483, JP-A-56-1548.
1, JP-A-56-118976, JP-A-56-12
8380, JP-A-57-2365, JP-A-57-8
9679, JP-A-57-143360, JP-A-59.
-15451, JP-A-58-191755, JP-A-59-96174, JP-A-59-161463, JP-A-60-6754, JP-A-60-123559,
JP-A-60-229957, JP-A-60-26065
4, JP-A-61-155469, JP-A-63-77.
97, JP-A-63-225665, JP-A-1-18.
Examples include dyes described in JP-A-5370 and JP-A-3-770. In particular, at least one of a sulfatoethyl sulfone group, a vinyl sulfone group, a monochlorotriazine group, and a monofluorotriazine group as a reactive group.
Dye having at least one or more species, or Sumifix,
Dyes marketed under the generic names such as Sumifix Supra and Remazol are preferred.

The monoazo dye mixture used in the present invention may further contain other dispersants, naphthalene derivatives, dissolution improvers such as anthraquinone derivatives such as anthraquinone-2-sulfonic acid, pH stabilizers, polyphosphates, etc., if necessary. A water softener, a defoaming agent, water, and other known auxiliaries can be contained.

A preferred embodiment of the present invention is a reactive dye,
In an ink jet printing ink comprising water and an organic solvent, a monoazo dye mixture represented by the general formula (I) and optionally the general formula (IV) in the form of a free acid is added in an amount of 1 to 35 in pure form. %, Preferably 3 to 30% by weight, more preferably 5 to 15% by weight.

Here, the monoazo dye means a pure dye product substantially containing no inorganic salt and the like, and a dye synthesized by a usual method is used for ultrafiltration, reverse osmosis membrane or electrodialysis. In the case of a commercially available dye (powder or liquid product), it is desalted in the same manner to be used as a substantially pure product.

The reactive dye in the ink jet printing ink of the present invention is present in the form of a free acid, a salt or a mixture thereof. Here, the counter ion is present as an alkali metal, alkaline earth metal or a substituted or unsubstituted ammonium salt, and preferably a sodium salt, a potassium salt, a lithium salt, an ammonium salt or the like.

In the ink-jet printing ink of the present invention, the pH thereof has a delicate influence on storage stability, ejection stability and the like.
It has been found that it is more preferable that the pH is in the range of 7, preferably pH 3.5 to 6. Here, the pH adjuster is not particularly limited, but sodium hydroxide, potassium hydroxide, sodium acetate, sodium carbonate, sodium bicarbonate, alkanolamine and the like are preferable for alkali, and hydrochloric acid, sulfuric acid, acetic acid and the like for acidity. Is preferred.

In the ink for ink jet textile printing of the present invention,
Specifically as the organic solvent to be mixed as necessary,
For example, methanol, ethanol, isopropanol, n
-Propanol, n-butanol, sec-butanol,
Alcohols such as tert-butanol, isobutanol and benzyl alcohol, amides such as dimethylformamide and diethylformamide, ketones such as acetone and diacetone alcohol, ethers such as tetrahydrofuran and dioxane, lactams such as caprolactam and ethylene glycol. , Propylene glycol, butylene glycol, pentanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, thiodiglycol, hexylene glycol, 2-methyl-
2,4-pentanediol, glycerin, 1,2,6-
Polyhydric alcohols such as hexanetriol, polyethylene glycol, (average molecular weight 200, 400, 600
Etc.), polypropylene glycol (average molecular weight 200,
400, 600 etc.) polyalkylene glycols,
Ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol Lower alkyl ethers of polyhydric alcohols such as monopropyl ether, propylene glycol monobutyl ether, propylene glycol monophenyl ether, dipropylene glycol monobutyl ether, triethylene glycol monomethyl ether and triethylene glycol monoethyl ether, acetylene glycol Derivative (trade name: Surfynol: manufactured by Nisshin Chemical Co., Ltd.), alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, and nitrogen-containing heterocyclic ketones such as 1,3-dimethyl-2-imidazolidine. , 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-
Vinyl-pyrrolidone, N-octyl-2-pyrrolidone,
N- (2-hydroxyethyl) -2-pyrrolidone, N-
Cyclohexyl-2-pyrrolidone, N-dodecyl-2-
Pyrrolidone, N-isopropyl-2-pyrrolidone, N-
(N-Butyl) -2-pyrrolidone, N- (t-butyl)
-2-pyrrolidone, N-hexyl-2-pyrrolidone, N
-(3-hydroxypropyl) -2-pyrrolidone, N-
(2-Methoxyethyl) -2-pyrrolidone, N- (3-
Methoxypropyl) -2-pyrrolidone, N-benzyl-
Examples include pyrrolidones such as 2-pyrrolidone and polyvinylpyrrolidone. Among them, polyethylene glycol (average molecular weight 200, 400, 600, etc.), polypropylene glycol (average molecular weight 200, 400, 600)
Etc.) are preferably used.

The amount of the organic solvent used is 0 to 50% by weight, preferably 5 to 30% by weight in the ink for ink jet textile printing. These organic solvents improve the stability of the ink,
It has functions of preventing clogging of the inkjet head, wetting, adjusting viscosity, etc., and it is usually preferable to use an organic solvent together. In addition, these organic solvents, respectively,
Alternatively, two or more kinds may be mixed and used as long as they do not affect each other.

In addition, the ink-jet printing ink of the present invention may optionally contain various additives conventionally used in order to provide better properties. Specifically, for example, penetrants, preservatives, antifungal agents (eg, sodium dehydroacetate, 4-chloro-3-methylphenol, etc.), other UV absorbers, viscosity modifiers, anionic or nonionic surfactants, etc. Surface tension adjusting agent, electric conductivity adjusting agent, pH buffering agent, specific resistance value adjusting agent, infrared absorbing agent, antioxidant, chelating agent, defoaming agent and the like.

The amount of the inorganic neutral salt such as sodium chloride and sodium sulfate contained in the ink for inkjet printing of the present invention is preferably 1% by weight or less based on the ink solution.
More preferably, it is 0.1% by weight or less.

The method of printing a cellulosic fiber structure with the ink for inkjet printing according to the present invention can be realized in principle by a conventional printing method.

The cellulosic fiber structure in the method of the present invention is not particularly limited, but natural or regenerated cellulosic fibers such as cotton, linen, rayon, hemp, jute, ramie fiber, viscose silk and bemberg. Is exemplified. Fiber materials containing cellulosic fibers include cotton / polyester blended products, cotton /
Examples include nylon blended products and cotton / wool blended products.

The printing method for obtaining a printed product having excellent image quality with respect to a cellulosic fiber structure by the ink for inkjet printing of the present invention can be realized by a conventional printing method. In some cases, good image quality may not be obtained. Therefore, it is desirable to treat the cellulosic fiber structure with a paste such as sodium alginate, carboxymethyl cellulose (CMC), guar gum, and starch which are used in the conventional printing method before printing.

In the pretreatment of the cellulosic fiber structure with a sizing agent, urea, thiourea, an alkaline agent, a reduction inhibitor, a sequestering agent, a defoaming agent, etc. may be used together, if desired, as in the case of conventional printing pastes. It is also possible to do, and each effect can be added.

The ink jet printing ink fixing method of the present invention is also a conventional alkali printing method, a pre-alkali thermofix method, a pre-alkali steam method, an alkali shock method, an alkali ultra rapid steam method, an alkali blotch steam method, and an alkali pad. It can be applied regardless of the steam method or the alkaline cold fix method.

Examples of the ink jet printing ejection method according to the present invention include a continuous method, an on-demand method, a bubble jet method, a thermal jet method, a piezo method, and the like. The ink jet printing ink of the present invention is the above ejection method. It can be used for both.

[0057]

According to the present invention, an ink jet having excellent coloring properties and image quality with respect to a cellulosic fiber structure, excellent storage stability, and excellent ejection stability without the problem of ink head clogging. An ink for printing is obtained, and by using the ink to print a fabric by inkjet printing,
An excellent printed material can be obtained.

[0058]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, “part” means “part by weight”. Example 1 The following formula (II) -a in the form of free acid is used.

[0059]

[Chemical-19]

Sodium salt of monoazo dye represented by: 6.2 parts Polyethylene glycol (average molecular weight 200) 18.4 parts Ion-exchanged water 75.4 parts

The mixture was mixed and filtered through a membrane filter made of 0.2 μm polytetrafluoroethylene (hereinafter abbreviated as PTFE) to prepare an ink composition. The physical properties of this ink are as follows: surface tension (D / c) = 60.0, specific electric conductivity (m
S / c) = 8.9, viscosity (cps) = 2.45, pH = 3.8
Met.

Example 2 Sodium salt of monoazo dye represented by the following formula (II) -a in the form of the free acid used in Example 6.0: 6.0 parts In the form of the free acid, the following formula (IV)

[0063]

[Chemical-20]

Sodium salt of monoazo dye represented by: 0.6 part N-ethyl-2-pyrrolidone 20.0 parts ion-exchanged water 73.4 parts

Were mixed and filtered through a 0.2 μm PTFE membrane filter to prepare an ink composition. The physical properties of this ink are as follows: surface tension (D / c) = 60.3, specific conductivity (mS / c) = 8.8, viscosity (cps) = 2.49, pH =
It was 3.6.

Example 3 A sodium salt of a monoazo dye represented by the following formula (II) -a in the form of the free acid used in Example 1 4.9 parts The following formula (III) -a in the form of the free acid.

[0067]

[Chemical 21]

Sodium salt of monoazo dye represented by: 1.4 parts Natrium salt of monoazo dye represented by the following formula (IV) in the form of the free acid used in Example 2: 0.5 part Polyethylene glycol (average molecular weight: 200 ) 18.4 parts Ion-exchanged water 74.8 parts

Were mixed and filtered through a 0.2 μm PTFE membrane filter to obtain an ink composition (pH = 3.9).
I got

Example 4 Sodium salt of monoazo dye represented by formula (II) -a described in Example 6.3 6.3 parts Formaldehyde condensate of methylnaphthalenesulfonic acid (sodium salt) (degree of sulfonation 65%, average) Degree of condensation 2.2) 3.1 parts Polyethylene glycol (average molecular weight 200) 18.4 parts Ion-exchanged water 72.2 parts

Were mixed and filtered through a 0.2 μm PTFE membrane filter to obtain an ink composition (pH = 3.6).
I got

Example 5 Sodium salt of monoazo dye represented by formula (II) -a described in Example 1 5.6 parts Sodium salt of monoazo dye represented by formula (III) -a described in Example 3 3.5 parts Methylnaphthalenesulfonic acid formaldehyde condensate (sodium salt) (Sulfonation degree 75%, average condensation degree 2.0) 3.0 parts Polyethylene glycol (average molecular weight 200) 19.8 parts Ion-exchanged water 68. 1st copy

Was mixed and filtered through a 0.2 μm PTFE membrane filter to obtain an ink composition (pH = 3.7).
I got

Example 6 Sodium salt of monoazo dye represented by formula (II) -a described in Example 1 5.6 parts Sodium salt of monoazo dye represented by formula (III) -a described in Example 3 0.3 part Sodium salt of monoazo dye represented by formula (IV) described in Example 2 0.3 part Formaldehyde condensate of methylnaphthalene sulfonic acid (sodium salt) (Sulfonation degree 65%, average degree of condensation 2. 5) 2.0 parts Polyethylene glycol (average molecular weight 200) 18.4 parts Ion-exchanged water 73.4 parts

Were mixed and filtered through a 0.2 μm PTFE membrane filter to obtain an ink composition (pH = 3.9).
I got

(Printing Method 1) Using the inks of Examples 1 to 6, the following pretreatment, ink jet printing and post-treatment were carried out on the article to be printed.

(Pretreatment Method for Printed Material) Cotton broad (mercerizing treatment) is a pretreatment liquid with the following mixture,
Padded at 100% pickup rate, 120 ℃
And dried for 90 seconds to obtain a pretreated cloth.

(Pretreatment liquid composition) Snow Algin M (Fuji Chemical Co., sodium alginate) 15 parts Sodium metanitrobenzene sulfonate (reduction inhibitor) 40 parts Water 945 parts

(Printing conditions) Using the above-mentioned pretreated cloth, the inks shown in the respective examples were solid-printed with Novajet II (Encad Thermal printer on-demand type). The resolution of the printer is 300 dpi.

(Post-Processing Method for Printed Material) The printed material was left for about 1 hour and then printed with 45 ° Baume sodium silicate,
After 24 hours of batch up, washing with water, soaping, and drying were sequentially performed.

(Evaluation) The obtained printed matter was evaluated for the following items. Storage stability: The ink filled in the cartridge was left for one week with the nozzle portion left open, and then a printing operation was performed to determine the ejection stability. Immediately stable discharge was obtained.

Print Quality: The inks of Examples 1 to 6 had almost no bleeding and were excellent in sharpness.

(Printing Method No. 2) Using the inks of Examples 1 to 6, the following pretreatment, inkjet printing and post-treatment were carried out on the article to be printed. The inks of the present invention all showed excellent performance.

(Pretreatment Method for Printed Material) Cotton broad (mercerizing treatment) is a pretreatment liquid with the following mixture,
Padded at a pick-up rate of about 70%, 120 ° C
And dried for 90 seconds to obtain a pretreated cloth.

(Pretreatment liquid composition) Snow Algin M (Fuji Chemical Co., sodium alginate) 15 parts Urea 1.5 parts Sodium metanitrobenzene sulfonate (reduction inhibitor) 40 parts Baking soda 20 parts Ripol CR (water repellent) 1.5 parts water 922 parts

(Printing conditions) Using the above pretreated cloth, the inks shown in Examples 1 to 6 were solid-printed with Novajet II (Encad Thermal printer on-demand type). The resolution of the printer is 300 dpi.

(Post-Processing Method for Printed Material) 102
Steaming was performed at 60 ° C. for 60 seconds, and washing with water, soaping, and drying were sequentially performed.

Even when the above-mentioned printing method was applied to a cloth mainly composed of rayon and hemp instead of cotton broad (mercerizing treatment), excellent ink-jet printing could be similarly performed.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Yabushita 3-98 Kasugadeka, Konohana-ku, Osaka Sumitomo Chemical Co., Ltd.

Claims (11)

[Claims] 1. An ink-jet printing ink comprising a reactive dye, water and, if necessary, an organic solvent, the following general formula (I): [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] The ink for inkjet printing characterized by using the monoazo dye shown by these. 2. The following general formula in the form of a free acid is used as a reactive dye.
(II) [Chemical-2] [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] The ink for inkjet printing according to claim 1, wherein a monoazo dye represented by the formula [1] is used. 3. An ink-jet printing ink comprising a reactive dye, water and, if necessary, an organic solvent, the following general formula (II): [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] 1 to 99% by weight of a monoazo dye represented by the following general formula (III) [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] A monoazo dye mixture containing 1 to 99% by weight of the monoazo dye represented by the formula [1] is used for ink jet textile printing. 4. An ink jet printing ink comprising a reactive dye, water and, if necessary, an organic solvent, the following general formula (II): [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] 80 to 99% by weight of a monoazo dye represented by the following formula and the following formula (IV) An ink for inkjet printing, comprising a monoazo dye mixture containing 1 to 20% by weight of the monoazo dye represented by 5. An ink-jet printing ink comprising a reactive dye, water and optionally an organic solvent, wherein the reactive dye is represented by the following general formula (II): [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. 1 to 99% by weight of a monoazo dye represented by the following general formula (III) in the form of a free acid: [In the formula, Q ₁ represents a group capable of leaving by the action of an alkali. ] 0 to 98% by weight of a monoazo dye represented by the formula and the following formula (IV) in the form of a free acid: An ink for inkjet printing, comprising a monoazo dye mixture containing 1 to 20% by weight of the monoazo dye represented by 6. A monoazo dye or a monoazo dye mixture 1
1 to 10 parts by weight of an optionally alkylated formaldehyde condensate of naphthalene sulfonic acid is used per 100 parts by weight.
The ink for ink-jet printing according to any one of claims 1 to 5, which contains 0 part by weight. 7. The formaldehyde condensate of naphthalene sulfonic acid which may be alkylated is a formaldehyde condensate of naphthalene sulfonic acid having 1 to 3 C _{1 to} C ₄ alkyl groups. Inkjet printing ink. 8. The ink jet printing according to claim 6, wherein the formaldehyde condensate of naphthalene sulfonic acid which may be alkylated has a degree of sulfonation of naphthalene sulfonic acid of 50 to 150%. Ink. 9. The ink-jet printing according to claim 6, wherein the formaldehyde condensate of optionally alkylated naphthalene sulfonic acid has an average degree of condensation of 1.1 to 3.0. Ink. 10. A method for inkjet printing, which comprises printing a cloth made of a cellulosic fiber structure with the inkjet printing ink according to any one of claims 1 to 9. 11. A cloth made of a cellulosic fiber structure obtained by the inkjet printing method according to claim 10.