JPS58147470A - Water-based ink for ink jet printing - Google Patents

Abstract

PURPOSE:To provide the titled black ink having excellent light resistance, free from the tendency to cause the nozzle clogging, and capable of giving a clear and sharp recording, by combining three kinds of water-soluble dyes each composed of one or more compounds having specific structure. CONSTITUTION:The objective ink is prepard by dissolving (A) a water-soluble dye composition composed of (a) one or more dyes of formulaI(R1 is phenyl, alkyl or aralkyl; R2 is alkyl or phenyl; Z1 is atomic group forming benzene ring or naphthalene ring; l and m are 0-2; l+m is 1-3; Q is H, alkali metal cation, NH4<+>, etc.), (b) one or more dyes of formula II (R3 is R1; R4 is alkyl, phenyl, amino, etc.; Z2 is Z1; M1 is Cu, Co, etc.; n and p are 0-2; n+p is 1-3) and (c) one or more dyes of formula III (Z3 is Z1, Z4 is atomic group forming naphthalene ring; M2 is M1; q and r are 0-2; q+r is 1-3) and (B) a wetting agent (preferably N-methyl-2-pyrrolidone, etc.) in water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a black water-based ink suitable for inkjet printing. More details: Improved black water-based ink for inkjet printing that provides excellent light resistance (62), clear and smudge-free recordings, and also features long-term continuous operation without clogging the nozzles. Black water-based ink for inkjet printing with excellent ink ejection stability that does not cause solid matter to adhere to a part of the nozzle even when restarting after inkjet printing has been interrupted (=
related.

In the inkjet printing method, ink is ejected as ink droplets from a fine nozzle (nozzle diameter from several μm to several hundred μm), each ink droplet is given a predetermined static electricity by an electric signal 62, and a high-voltage deflection electrode (from two In this method, ink is electrostatically deflected and formed into a predetermined dot matrix (i.e., characters, figures, etc.) on the surface of the printing object. Ink is electrostatically drawn out as ink droplets from a fine nozzle as described above using a high-voltage electrode, accelerated, and scratched. A method of electrostatically deflecting ink droplets using an inner electrode to form characters or figures on the surface of a printing medium in a predetermined dot matrix; A typical method is known in which characters and figures are formed on the surface of a printing medium 1 according to a dot matrix.

In other words, inkjet printing is based on basic 6: Ink is ejected from a fine nozzle as an ink droplet, and the charged ink droplets are electrostatically controlled, or the ink droplets from a fine nozzle respond to an electrical signal. It consists of the steps of ejecting the paper and forming characters and figures on the surface of the printing medium.

Such inkjet printing (: The water-based ink used is water-based, and is composed of a hydrophilic ammonium chloride agent, a coloring dye, and other various additives depending on the composition, and can be applied to various objects, such as The surface of the printing material such as plastic, metal, paper, cloth, etc. (C: for printing characters and figures)
It is used.

By the way, the water-based ink for inkjet printing used in this way is required to have the following properties.

(1) Characteristics necessary to obtain uniform ink droplets sprayed from a narrow nozzle (a) The viscosity of the ink is t-tocps (at Q0C).

(b) The surface tension of the ink is 0 dyoe/cm or more.

(/9 The ink must be homogeneous and contain no irregular particles.

(2) Characteristics required on the surface of the printing medium (a) The ink should have good drying properties, quickly penetrate or dry after inkjet printing, and characters and figures should not be distorted.

(b) Inkjet printed characters and figures (: The ink must be water resistant to the extent that it will not wash away even if water gets on it.

(/9 Good adhesion of ink to the printing surface during inkjet printing.

(3) The surface of the printing medium (to obtain a two-colored image (=required characteristics of the ink) (a) The dye contained in the ink must have at least the color required for the final colored image.

(b) The dyes contained in the ink should be yellow, magenta, and cyan as much as possible in the subtractive color method, absorb visible light in the desired spectral range, and have as little attenuation as possible.

(1) The colored image obtained by inkjet printing must be sufficiently clear (no blurring).

The dye contained in the ink exhibits high chroma and density on the surface of the printing medium, and the hue does not change even when it is stored as an ink and after being printed and attached to the surface of the printing medium. , Has good light resistance and does not fade in color.

(e) The dye contained in the ink must have high solubility in water to form an ink with high color saturation and density.

(-) 4=The dye contained in the ink is extreme 6=Does not increase the viscosity of the ink.

(g) The dye contained in the ink must have low crystallinity so that it will not crystallize or solidify and cause nozzle clogging while being stored or left as an ink.

Conventionally, black dyes used in inkjet printing inks include JP-A-10-11421 and JP-A-10-11421;
/7 IIAO issue, same j0- reference to.

Reference, same J/-j cooto-@, same J/-j cooO reference, same 11-77704, same IJ-41 No. 12, same 1
No. 1-77704, Tokuko Akira! 3-14J 3-J issue, JP-A-Shojj-3 J/! J issue, same j6-ko 14th issue, same j6-ko 34th issue, same! No. 4-1197J, same 5t-itri 74
I-No. 1! -70 #047, same! J-/4L4A
Direct dyes and acid dyes described in No. 04 and No. 8070 of ZS-7 are known.

However, when using these dyes, the problem occurs during continuous printing or when restarting printing (
= Nozzles were clogged, drying properties after printing were poor, images were blurred, light fastness was poor, and the results were not necessarily satisfactory.

Further 6: When a color image was recorded using yellow, magenta, cyan, and black inks, the black density was low, and further 4 = the black hue and saturation were poor, and a satisfactory color orin was not necessarily obtained.

A first object of the present invention is to provide a black water-based ink for inkjet printing.

A third object of the present invention is to provide a black water-based ink that has a light color density and hue on a printing medium and shows little change in both color density and hue when left over time.

A third object of the present invention is to provide an improved black water-based ink for inkjet printing that does not clog the nozzles of an inkjet printing device.

These U objects of the present invention are that in a water-based ink for inkjet printing which is prepared by dissolving a water-soluble dye and a wetting agent in water, the following general formulas [1] and ('l) are used as water-based dyes.
This was achieved by using at least one of each of water-soluble dyes 1 shown in ] and (1) in combination.

General formula [I] R1+SO3Q)m In the formula, R1 represents a phenyl group, an alkyl group or an aralkyl group. R2 represents an alkyl group or a phenyl group. zl represents a ben nucleus or a group of atoms forming naphthalene. lsm represents θ and/or -, respectively;
+m represents /, J or J. Q represents a hydrogen atom, an alkali metal cation, NH2O or an organic quaternary ammonium cation.

In the general formula [I], the phenyl group represented by R1 may have one or more substituents other than 18O3Q. (e.g. methyl group, ethyl group), alkoxy group (e.g. methoxy group, ethoxy group), alkoxycarbonyl group (e.g. methoxycarbonyl group, ethoxycarbonyl group), carboxy group, cyano group, nitro group,
There is strong momentum. The alkyl group represented by R1 is -80
It may have one or more substituents other than 3Q, and examples of substituents include hydroxy group, cyano group, carboxy group/alkoxy group (e.g. methoxyv group, ethoxy group), alkoxycarbonyl group (e.g. methoxy carbonyl group,
Ethoxycarbonyl &), etc. The 7ralkyl group represented by R1 may have a single amino group other than 18O3Q, and examples of substituents include halogen atoms (e.g. chlorine atom), alkyl groups (e.g. methyl group, ethyl group). ), an alkoxy group (for example, a methonyl group), a carboxy group, and the like. Furthermore, the benzene or naphthalene nucleus containing zl may have one or more substituents other than 18o3Q, and examples of substituents include halogen atoms (e.g. chlorine atoms), alkyl groups (e.g. methyl group, ethyl group). group), alkoxy group (eg, methoxy group, ethoxy group), alkoxycarbonyl group (eg, methoxycarbonyl group, ethoxycarbonyl group), carboxy group, cyano group, hydroxy group, nitro group, and the like.

General formula [1) % formula %) In the formula, R3 represents a phenyl group, an alkyl group or an aralkyl group. R4 represents an alkyl group, phenyl group, amino group, cyano group, hydroxy group, alkoxy group, ureido group, alkoxycarbonyl group, carbamoyl group or carboxy group. Z2 represents a group of atoms forming a benzene nucleus or a naphthalene nucleus. Ml represents Cu, Cos Cr or N1.

n,pi′! 0 each. / or represents ko, 1+p
represents 11 or 3. Q represents a hydrogen atom, an alkali metal cation, NH4(+) or an organic quaternary ammonium cation.

General formula (a phenyl group represented by C1R3 in 11,
The alkyl group and the aralkyl group may have one or more substituents other than -803Q, and examples of the substituent include the phenyl group represented by R1 in the general formula [■],
Mention may be made of the substituents mentioned for alkyl and aralkyl groups. Further, the phenyl group, 7mino group and ureido group represented by R4 may have one or more substituents. Examples of substituents include phenyl groups (for example, halogen atoms (e.g., chlorine atoms), alkyl groups (e.g., methyl groups), amicite 1; for example, alkyl groups (e.g., methyl groups), aryl groups (e.g. phenyl group), acyl group (e.g. acetyl group, benzoyl group), etc.; for ureido group, alkyl group (e.g. methyl group),
Examples include aryl groups (eg, phenyl groups), and the like. Benzene nucleus or naphthalene nucleus containing Z2 is -803
It may have a substituent on ImU other than QXJ, and examples of the substituent include the substituents described for zl in general formula [I].

General Formula [I] In the formula, z3 represents a benzene nucleus or a naphthalene nucleation atomic group, and ffi Z4 represents a naphthalene nucleation atomic group. N2 represents Cu, Co5Cr or Ni. q,
, r are respectively 0, l or ko, and q+r is 11
Represents ko or 3. Q represents a hydrogen atom, an alkali metal cation, NH4, or an organic quaternary ammonium cation.

In the general formula ci'3t'-, the benzene nucleus or naphthalene nucleus containing Z3 may have one or more substituents other than -803Q, and examples of substituents include the general formula (1
Regarding zl in 1, t: substituent is mentioned. Also Z
The naphthalene nucleus containing 4 may have one or more substituents other than 1803Q, and examples of substituents include amino groups (e.g., alkylamino groups such as amino groups, methylamino groups, and ethylamino groups). , a phenylamino group, a chlorophenylamino group, a methylphenylamino group, an acylamino group such as an acetylamino group, an insyylamino group, a chloro-αbenzoylamino group, a methanesulfonylamino group) , hydroxy group, and the like.

Preferred and particularly preferred water-soluble dyes used in the present invention are shown below.

In the general formula [Summer], R1 is a phenyl group, a substituted phenyl group (substituents include a chlorine atom, a methyl group, a metquine group, and a carboxy group), or a lower alkyl group (having a carbon number of 1 to 3, e.g., a methyl group, an ethyl group, A propyl group, etc.) are preferred, and an N-phenyl group, a substituted phenyl group, or a lower alkyl group is particularly preferred. R2 is preferably a lower alkyl group (carbon number 7, e.g. methyl group, ethyl group, propyl group), especially (-methyl group). In addition to 803Q, those having no substituent or those substituted with a chlorine atom, methyl group, or methoxy group are preferable.l+m is preferably 1 or -, and 1 or N.

In the general formula (1), R3 is a phenyl group, a substituted phenyl group (the II substituent is a chlorine atom, a methyl group, a methoxy group, or a carboxy group) or a lower furkyl group (having a carbon number of 1-
(e.g., ethyl group, propyl group, etc.), particularly phenyl group or substituted phenyl group (substituents include chlorine atom and methyl group). R4 is a lower alkyl group (carbon number/-4, e.g. methyl group, ethyl group, tert
-butyl group, etc.), phenyl group, amino group, acylamino group (e.g. acetylamino group, incylamino group, etc.), cyano group, hydroxy group, alkoxycarbonyl group (carbon number λ to 3, e.g. metquin carbonyl group, etc.), or A carboxyl group is preferable, and a methyl group, a phenyl group, a cyano group, a methoxycarbonyl group, and a carboxy group are preferable.

z2 is preferably a benzene nucleus-forming atom group, and particularly preferably one in which the benzene nucleus is substituted with a chlorine atom, a methyl group, or a di-o crystal in addition to 18O3Q.

Ml is preferably Cu or Cr. n+p is preferably 1 or .

In the general formula [1], % Z3 is preferably a benzene-forming atomic group, particularly preferably one having at least one nitro group. Z4 is preferably an amino group, an anrulamino group (for example, an acetylamino group, a benzoylamino group, a methanesulfonylamino group, etc.) or a naphthalene nucleating atom group having a hydroxy group, particularly an amino group or an acylamino group.

The naphthalene-type fitj having the group [child group is preferred.

M2 is preferably Cu or C, particularly preferably Cu. 9+ is preferably C or J.

The following are specific examples of water-soluble dyes used in the ink of the present invention.However, the dyes of the present invention are not limited to these.

Specific example of dye represented by general formula [1] 1, - / l-co1'I O3Nm 1-J α ■-蓼1 03Nm -j (CH2) 3803N a -7 Dye represented by general formula (1) Specific example of 1-ko1 8 0 3 N a -J ■-tei8 0 3 N m 1-j α -4 α 8038m 1-f C,1,Ac1d Red /1J(C
,1-ittoo") 厘-ty C,■,mucid Red /I
I (C, 1° / 17! 14) Ca-tt C, 1, Mu cid Orange 7
Reference (C, 1, /f7 reference j) 1-/JC, 1, Mu cid Red /1 & (C, I
.

trtto> 1-/JC,[,mucid Rtd/ft(C,
I.

lytz) Specific inversion of the formula expressed by the general formula [1] -1 ,803Nml l-ko03N1 O2 1-1 ■-60 12 -10 厘-// 1'-/ko c, 1. Mu cid Red /r#(C
,I.

ts6ts> 1-/J C, 1, Ac1d Black j/
(C, I.

tgytt) 厘-/4E C, 1, Ac1d Black J
Ko (C, I.

/17//) In the water-based ink of this Shinmei, the water-soluble dye represented by the general formula [I] is usually contained in the ink at 0.7-7% by weight, and the water-soluble dye represented by the general formula [1] is contained in the ink. 0.7-7% by weight
, the water-soluble dye represented by the general formula CI) is /, 0-. 4
The amount of the dye represented by the general formula [I], [1], [1] in weight percent is contained in an amount of 1 to 4, preferably 1 to 10 cm. If the amount is less than this, the ability as a colorant may be lost, and if the amount is more than this, even if the dye is dissolved, precipitation will occur over a long period of time, and the inkjet printing ink will It may be inappropriate as such.

The g1ij4 agent used in the present invention is added for the purpose of improving the drying resistance of the ink and assisting in dissolving the dye. The surface tension is J (more than 7 dyne/cm, especially 3
0dyne/cm or more, and the solution viscosity is 10Cp
It is preferable that the water-soluble dye be dissolved in an amount of 0.5% by weight or more at room temperature.

Such wetting agents are disclosed in Japanese Patent Application Laid-open No. 10-7/4A23,
i-zt core issue, same! /-/37101 No. 1: Corpyrolidon species that have been recorded; JP-A-11-1977/71at
1, J-dialkyl-λ-imidazolidinones described in JP-A-Kokai Shotei Tartuff No. 620, JP-A No. 5t
Carboxylic acid amide derivatives described in JP-A-13-441 Kot No. 7 (= lactones described in JP-A-13-441 Kot No.; described in JP-A-13-441 Kota No. Dioquine ethylene sulfur compound; JP-A Sho!l-!Co00 No. 舊: Described alcohol amines; JP-A Sho!/-J/J Co No. 4: Described N-formyl lactam derivatives ; JP-A-10-/jjJJ area = described sulfolane; JP-KOKAI Sho-j/-II-04c147, JP-KOKAI SHOJ/-
/J7! No. 06, same! Reference-1 JtOF; = Polyalkylene glycols and monoethers of polyalkylene glycol described; Coptin-1 described in JP-A No. 11-414-7, No. 1/-/Kota JIO , tri-diol, t-
Butyl alcohol, amyl alcohol, monohydric or ti
Dihydric alcohol; Cellulose derivatives such as hydroxypropyl cellulose and polyvinyl alcohol described in JP-A-10-1-J40; Preferably, the water-soluble alginates described in JP-A No. 12OOS, etc., are preferred.

The water-based ink of the present invention (: The content of the wetting agent used varies depending on the type of CA, but the content is 100 parts by weight of the ink (: j~
It is better to suspend JO weight. Two or more lubricants used in the present invention can be used in combination.

Among the wetting agents used in the ink of the present invention, preferred ones among the above are copyrrolidones (e.g. N-methyl-
Copyrrolidone, N-(cohydroxyethyl)-2-
pyrrolidone, etc.); 'l'-dialkyl-λ-imidazolidinones; carboxylamide derivatives (e.g. N-(co-hydroxyethyl)lactamide l)i dioquine ethylene sulfur compounds (e.g. co-, ,
One or more types of sulfolane for ink C=! ~1
This is the case when the weight is 0. This is C; Polyalkylene glycols and monoethers of polyalkylene glycol; For example, diethylene glycol, triethylene glycol, diethylene glycol monodityl ether, diethylene glycol monodityl ether, triethylene glycol mono Dithyl ether, etc. o, 7-5
It is more preferable to use % by weight.

The black ink of the present invention can also be used to make color thumbnails by a subtractive color method using yellow ink, main ink, and thin ink.

When producing color tS in this way, dyes described in the following 1 can be used.

As the water-soluble dye for the yellow ink layer, for example, JP-A-Sho J.
Reference No. 111, same! Ko-14 Ko No. J, Opening Tar
1J No. etc., furthermore, C, 1, Direc
t Yellow-J7, -21. -JJ, -Jf,
-sr, -14, -/DO%C,I.

Ac1d Yellow-/ 7,-/ 7%-J
j, -Jri, -31, -da? , -jri, -6/, -
Direct dyes and acid dyes such as 72, -7ii, -it, -1i4, etc. can be used.

As a water-soluble dye for magenta ink, for example, JP-A-Shoj
4'-19111/No. j41-46JO, Open-2
-L1J No., etc. 42, furthermore (2C1I,
Direct Red-4J, -71, -79, -t
o, -tJ, -tade, -ko o1-2ko reference, -ko λ
z, C, 1, Ac1d Red-t, -t, -3r, -
77, -32, -jko, -j7, -17, -octopus, -/
I! r, -//9, -1J/, -/JJ, -1J reference, -
JJ san, -/14, -ko mairi, -JJ san, -1! 4, etc. i! [Cut dyes and acid dyes can be used.

As a water-soluble dye for cyan ink, for example, JP-A No. 11
-1911/No. 1911/, No. 12-/, IQQI No., etc., as well as C, 1, Direct Blue-/, -1
,-77,-74,-71,-10°-it,-90,
-104, -10r, -/21゜-/4J,-/t
z, C, 1, 'Ac1d Blue -cob, -lcoA
, -/7/, -171, -/13, etc. or acid dyes can be used.

The ink 42 of the present invention can also contain a deterrent and an oxygen absorber.

Examples of anti-oxidizing agents include sodium dehydroacetate, which is described in Tokukan Akiko/2001; Call 0
l listed in No. 0.

Cobenzizothiazoline-3-one 8 Tokukaisho! -11
Joto issue, same! Coke No. 4101 No. 1; 4-1 Seven Tokiv11, Yume-dimethyl-m-dioxane described; Formalin and pentachlorophenol sodium described in JP-A No. 410-11421; JP-A No. 11-Sho.
-3001; listed sodium benzoate; JP-A-Sho! J-IJJ707 No. 4: The citrate of l-quinolitool described is effective.

Tokukai Sho is the best oxygen absorber! Koh 7 Sansan No. 04, No. 13
-4/If/Sulfites such as sodium sulfite and hydrogen sulfate described in No. 42 are effective.

Further, as surface tension adjusting agents, anionic surfactants (e.g. sodium alkyl sulfate, III), cationic surfactants (e.g. alkylpyridium sulfate,
- nonionic surfactants (eg polyoxyethylene alkyl ethers, etc.) or amphoteric surfactants can be used.

Inkjet printers to which the water-based ink of the present invention can be applied are particularly limited, but include those of a charge control type as disclosed in U.S. Pat. 4: Applicable to any method such as the pressure pulse method as disclosed.

The printing materials to which the ink of the present invention is applied include paper, cloth,
film base, etc. There are no particular restrictions on the paper, and any paper that is generally used for inkjet printing can be used, but paper is particularly preferred. Regarding coated paper, for example, the descriptions in Japanese Patent Application Laid-open No. 172 and No. 4714 can be referred to as reference 1:.

The aqueous ink of the present invention can be used not only for inkjet printing, but also as an ink for recording instruments such as nine-pin or fountain silver, by appropriately adjusting various properties.

Hereinafter F): The present invention will be specifically explained with reference to Examples. Note that in the following, "parts" indicate "parts by weight."

Example l Composition of Ink-l (invention) Dye (1-/) 0.1 part dye (Seal-2) 2.3 parts dye (Seal-/)
J・0 part N-meterucorpyrrolidone tt, o part co, coch-osiglycol
z, o part triethanolamine co-0
Part water 76.0 parts The mixture having the above composition was stirred for 1 hour while heating at JOoC, pO'c4, and then filtered under pressure ( j Kf/cm ) L, the desired ink was obtained. In the same manner, 51 kg of the ink of the present invention was prepared using the following mixture.

Example Composition of Coinkyco (this invention) Dye (1-/)', 6 parts dye (■-2) Co, 4I part dye (
1-J) j-λ part N-meterucopyrrolidone 10.0 parts, 2-thiodiglycol 4.0 parts diethylene glycol
i, o part triethanolamine co-0
Part water 7ψ, 1 part Example 3 Composition of Ink-3 (invention) Dye (I--2) 0-' part Dye (
1-j)!・Main part dye (1-J
') Part J/J-dimethylucoimidazolidinone/1.0 part Diethylene glycol motubutyl ether 0. Main part triethanolamine 1.0 part water
7/, 1 part actual example Composition of reference ink-# (this invention) Dye (1-J) /・0 part Dye (
1-4) J-j part dye (summer-co)
J-Part N-Medelukopyrrolidone /j, 0 parts N-Hydroquinoethyl lactamide J, 0 parts Triethanolamine
J・0 part water 7 pieces, O part actual example! Ink! Composition of dye (summer) (of the present invention) 1.0 parts dye (1-
Reference) J.0 part dye (l-1)
#, 0 parts N-methyl-copyrrolidone
10.0 parts sulfolane
J, 0 parts diethylene glycol 1.0 parts triethanolamine 3.0 parts nonionic surfactant O-1 part water
7/, Comparison Dye - Reference (C, described in JP-A No. 1!-83111), Ac1d Black J/ Comparative Example 1 Composition of Comparative Ink-1 Composition C of Example 1: Instead of the combination of dyes (I-/), (H-co), and (1-/), comparative dye-1 was used in 3.
I used the part.

Comparative example
In place of the combination of J) and (Summer-1), 1 part of Comparative Dye-1 was used.

Comparative Example J Composition of Comparative Ink-J In the composition of Example K, dye (1-/') and (1-
In place of the combination of 2) and (1-J), 0 parts of comparative dye-J was used.

Comparative Example Composition of Comparison Ink-Tei In the composition of Example J, instead of the combination of dye (1-4'), (■-koto), and (summer-φ), comparative dye-Ui J,
One part was used.

The physical properties and performance of each ink thus obtained, as well as recording paper (1) and (1) prepared using these with the following formulations.
Record 1 of inkjet printing on (inkjet printer [Jet Print N (used by Sharp Frog))
The performance of the III image is summarized in Table 1.

Preparation of recording paper (1) LBKP (wide aim bleached kraft pulp) i.

P main shock C8F reference JOccl: Beat 0 parts, add 75 parts of tal, 1 part of saponified rosin, and part of sulfuric acid to give basis weight /
A base paper of 00 f/m2 was made using a Fourdrinier paper machine. During paper making, oxidized starch is removed as solids using a size press.
/m”*clothed.

70 parts of synthetic zeolite, 30 parts of synthetic aluminum silicate, 0. J part, casein 10 parts,
A coating solution having a solid content of Joqb consisting of 10 parts of styrene-butadiene copolymer latex, 1 part of melamine resin, and 2 parts of polyethylene glycol was prepared.

The above-mentioned base paper was coated with a coating solution twAg to a coating thickness of 7 m 2 on one side using an energy knife coater, dried, and then passed through a supercalender to prepare a recording paper (1).

Preparation of Recording Paper (1) 5 weights of basic polymer (Zinandiamide condensate (Sanyo Ka-Rin & Chinfu 0)) was applied to one side of a base paper with a basis weight of 1001/m" and a cob size of Cojf/m2. Coat an aqueous solution containing 5% by weight of gelatin, heavy weight type silica and synthetic aluminum silica) with a dry solid lid so that the amount is 7.jf/ml using a C: F-knife coater and calender. Recording paper (1) was created.

As is clear from Table 1, the ink using the dye of the present invention has excellent storage stability and does not cause clogging in the nozzle. It was found that recording lkIgl has excellent light resistance.

Claims (1)

[Scope of Claims] A water-based inkjet printing ink 6 made by dissolving water-soluble dyes and abrasives in water; A water-based ink for inkjet printing, characterized in that at least one of each of the water-soluble materials represented by [Otori] is used in combination.General formula [I] In the formula, R1 represents a phenyl group, an alkyl group, or an aralkyl group. R2 represents an alkyl group or a phenyl group. Zl represents a bene group or a naphthalene nucleation atomic group. 1% m each represents 0% I or a
I+rn represents 12λ or J. Q represents a hydrogen atom, an alkali metal cation, NH2O or an organic quaternary ammonium cation. General Formula [厘] In the formula, R3 represents a phenyl group, an alkyl group or an aralkyl group. R4 represents an alkyl group, phenyl group, amino group, cyano group, hydroxy group, flukoxy group, frayed group, alkoxycarbonyl group, carbamoyl group or carboxyne group. z2 represents a ben nucleus or a naphthalene forming atomic group. Ml represents Cu, Co, Cr or Nj. 11% p is each 0 and/or , n+p
/ represents J or J. Q represents a hydrogen atom, an alkali metal cation, NH2O or an organic quaternary ammonium cation. General length 〔㎘〕 In the formula, %za represents a group of atoms to be formed with penylene or naphthalene. z4 represents a group of atoms forming naphthalene. M
2 represents Cu%Co, Cr or Ni. ql r represents 0 and/or ko, respectively, and q+r represents l, ko, or J. Q is hydrogen source f, alkali metal cation,
Represents NH2O or an organic quaternary ammonium cation.