JP5344209B2 - Ink jet recording ink, ink cartridge, and ink jet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ink for inkjet recording, excellent in clarity, color developability and storage stability and giving recorded articles excellent in fastness. <P>SOLUTION: The ink for the inkjet recording, comprises a colorant, water, and a water-soluble organic solvent, and the colorant comprises the following dyes (1) and (2). The ink is excellent in clarity, color developability, and storage stability, and gives recorded articles using the ink excellent in fastness. The dye (1) is a dye represented by general formula (1) and the dye (2) is C.I. Direct Yellow 86. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an ink for ink jet recording, an ink cartridge, and an ink jet recording apparatus.

  Conventionally, as a yellow ink for inkjet recording, C.I. I. Direct Yellow 86 and C.I. I. Inks containing direct yellow 132 and the like are known (see, for example, Patent Documents 1 to 4). The ink has (1) excellent sharpness and color developability, (2) excellent storage stability without deterioration even after long-term storage, (3) light resistance of recorded matter, It is required to be excellent in fastness such as ozone resistance. However, none of the conventional inks satisfy all the above performances.

JP-A-6-100809 JP-A-6-228482 JP 2000-154344 A JP 2006-63329 A

  Accordingly, an object of the present invention is to provide an ink for ink jet recording which is excellent in sharpness, color development and storage stability and excellent in fastness of recorded matter.

前記一般式（１）において、
Ｒ_１、Ｒ_２、Ｙ_１およびＹ_２は、それぞれ、一価の基であり、Ｒ_１、Ｒ_２、Ｙ_１およびＹ_２は同一でも異なっていてもよく、
Ｘ_１およびＸ_２は、それぞれ、電子吸引性基であり、Ｘ_１およびＸ_２は同一でも異なっていてもよく、
Ｚ_１およびＺ_２は、それぞれ、水素原子、置換または無置換のアルキル基、置換または無置換のアルケニル基、置換または無置換のアルキニル基、置換または無置換のアラルキル基、置換または無置換のアリール基、置換または無置換のヘテロ環基であり、Ｚ_１およびＺ_２は同一でも異なっていてもよく、
Ｍは、水素原子またはカチオンである。 In order to achieve the above object, the inkjet recording ink of the present invention is an inkjet recording ink containing a colorant, water and a water-soluble organic solvent,
The colorant includes the following dye (1) and dye (2),
Weight ratio of the dye (1) and the dye (2) in the ink, the dye (1): Dye (2) = 8: 2 to 9: Ri 1 der,
Amount of the dye (2) with respect to the total amount of the ink, characterized in 0.27 to 0.54 wt% der Rukoto.
Dye (1): Dye dye (2) represented by the following general formula (1): C.I. I. Direct yellow 86

In the general formula (1),
R ₁ , R ₂ , Y ₁ and Y ₂ are each a monovalent group, and R ₁ , R ₂ , Y ₁ and Y ₂ may be the same or different;
X ₁ and X ₂ are each an electron-withdrawing group, and X ₁ and X ₂ may be the same or different,
Z ₁ and Z ₂ are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, substituted or unsubstituted aryl A substituted or unsubstituted heterocyclic group, Z ₁ and Z ₂ may be the same or different;
M is a hydrogen atom or a cation.

In order to achieve the above object, the present inventors have conducted a series of researches, and as a result, the dye (1) and the dye (2) are used in combination in an inkjet recording ink, and the dye ( The weight ratio of 1) and the dye (2) is dye (1): dye (2) = 8: 2 to 9: 1 , and the blending amount of the dye (2) with respect to the total amount of the ink, When it was 0.27 to 0.54% by weight, it was found that it was excellent in all the performances of sharpness, color development, storage stability and fastness of recorded matter, and the present invention was achieved . Such an improvement in performance has been found for the first time by the present inventors. The mechanism by which the ink for ink jet recording of the present invention is excellent in all the above performances is assumed as follows, for example. While the dye (1) is excellent in fastness, the dye (2) is excellent in sharpness, color developability and storage stability. However, since the dye (1) has a triazine skeleton with extremely high hydrogen bonding properties, for example, when the ink contains a solvent having a hydroxyl group, if the ink (1) is stored for a long time, the dye (1) is brought into contact with the solvent by contact with the solvent. Some may break down. In contrast, the ink for ink jet recording of the present invention suppresses the decomposition of the dye (1) by the dye (2) even when the ink contains the solvent. The mechanism for improving the performance is speculation and does not limit the present invention. The ink for inkjet recording of the present invention exhibits a synergistic effect that goes beyond a simple combination of the dye (1) and the dye (2). For example, the improvement in the storage stability exceeds an intermediate level between the arithmetic average of the dye (1) and the dye (2). Such synergistic effects of the present invention are demonstrated in the examples described below.

  In the ink for inkjet recording of the present invention, the total blending amount of the dye (1) and the dye (2) is preferably 0.1 to 7% by weight with respect to the total amount of the ink.

  In the inkjet recording ink of the present invention, it is preferable that the water-soluble organic solvent contains a polyhydric alcohol.

  In the inkjet recording ink of the present invention, the polyhydric alcohol is preferably glycerin.

  In the ink for inkjet recording of the present invention, the blending amount of the glycerin with respect to the total amount of the ink is preferably 5 to 40% by weight.

  The use of the ink for inkjet recording of the present invention is not particularly limited, and for example, it can be used as a yellow ink. However, the present invention is not limited to this. The ink for inkjet recording of this invention can also be made into ink of colors other than yellow by using coloring agents other than the said dye (1) and the said dye (2).

  The ink cartridge of the present invention is an ink cartridge containing ink for ink jet recording, and the ink is the ink for ink jet recording of the present invention.

  The ink jet recording apparatus of the present invention is an ink jet recording apparatus that includes an ink cartridge and an ink discharge means, and ink for ink jet recording is discharged from the ink discharge means, and the ink cartridge is the ink cartridge of the present invention. It is characterized by that.

  Next, the inkjet recording ink of the present invention will be described. The ink of the present invention contains a colorant, water, and a water-soluble organic solvent. As described above, the colorant includes the dye (1) and the dye (2).

  As described above, the dye (1) is a dye represented by the general formula (1).

In the general formula (1), R ₁ , R ₂ , Y ₁ and Y ₂ are each a monovalent group, and R ₁ , R ₂ , Y ₁ and Y ₂ may be the same or different. The monovalent group is a hydrogen atom or a monovalent substituent. Examples of the monovalent substituent include a halogen atom; an alkyl group; a cycloalkyl group; an aralkyl group; an alkenyl group; an alkynyl group; an aryl group; a heterocyclic group; a cyano group; a hydroxyl group; Oxy group; silyloxy group; heterocyclic oxy group; acyloxy group; carbamoyloxy group; alkoxycarbonyloxy group; aryloxycarbonyloxy group; amino group such as alkylamino group and arylamino group; amide group; acylamino group; Alkoxycarbonylamino group; aryloxycarbonylamino group; sulfamoylamino group; alkylsulfonylamino group; arylsulfonylamino group; alkylthio group; arylthio group; heterocyclic thio group; Alkylsulfonyl group; arylsulfonyl group; acylsulfonyl; aryloxycarbonyl group; alkoxycarbonyl group; carbamoyl group; phosphino group; phosphinyloxy group; phosphinyloxy group; And silyl group; azo group; imide group and the like. The monovalent substituent may further have a substituent. Among these, preferable monovalent substituents are hydrogen atom, halogen atom, alkyl group, aryl group, heterocyclic group, cyano group, alkoxy group, amide group, ureido group, alkylsulfonylamino group, arylsulfonylamino group. , A sulfamoyl group, an alkylsulfonyl group, an arylsulfonyl group, a carbamoyl group, and an alkoxycarbonyl group, and more preferably a hydrogen atom, an alkyl group, an aryl group, a cyano group, and an alkylsulfonyl group.

  The halogen atom is a chlorine atom, a bromine atom or an iodine atom. Among these, a chlorine atom and a bromine atom are preferable.

  The alkyl group includes a substituted or unsubstituted alkyl group. The substituted or unsubstituted alkyl group is preferably an alkyl group having 1 to 30 carbon atoms. Examples of the alkyl group include methyl group, ethyl group, butyl group, t-butyl group, n-octyl group, eicosyl group, 2-chloroethyl group, hydroxyethyl group, cyanoethyl group, 4-sulfobutyl group and the like. . Examples of the substituent of the substituted alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a sec-butyl group, a t-butyl group, a 2-ethylhexyl group, a 2-methylsulfonylethyl group, and a 3-phenoxypropyl group. A linear or branched alkyl group having 1 to 12 carbon atoms such as a group or a trifluoromethyl group; a linear or branched aralkyl group having 7 to 18 carbon atoms; a linear or branched chain having 2 to 12 carbon atoms An alkenyl group; a linear or branched alkynyl group having 2 to 12 carbon atoms; a linear or branched cycloalkyl group having 3 to 12 carbon atoms such as a cyclopentyl group; a linear or branched chain having 3 to 12 carbon atoms; Cycloalkenyl group; halogen atom such as chlorine atom and bromine atom; ant such as phenyl group, 4-t-butylphenyl group, 2,4-di-t-amylphenyl group Heterocyclic group such as imidazolyl group, pyrazolyl group, triazolyl group, 2-furyl group, 2-thienyl group, 2-pyrimidinyl group, 2-benzothiazolyl group; cyano group; hydroxyl group; nitro group; carboxy group; Amino group; alkoxy group such as methoxy group, ethoxy group, 2-methoxyethoxy group, 2-methylsulfonylethoxy group; phenoxy group, 2-methylphenoxy group, 4-t-butylphenoxy group, 3-nitrophenoxy group, 3 Aryloxy groups such as -t-butyloxycarbonylphenoxy group and 3-methoxycarbonylphenyloxy group; acylamino groups such as acetamide group, benzamide group and 4- (3-t-butyl-4-hydroxyphenoxy) butanamide group; methyl Amino group, butylamino group, diethylamino group, methylbuty Alkylamino groups such as amino groups; arylamino groups such as phenylamino groups and 2-chloroanilino groups; ureido groups such as phenylureido groups, methylureido groups and N, N-dibutylureido groups; N, N-dipropylsulfamoyl Sulfamoylamino groups such as amino groups; alkylthio groups such as methylthio groups, octylthio groups, 2-phenoxyethylthio groups; phenylthio groups, 2-butoxy-5-t-octylphenylthio groups, 2-carboxyphenylthio groups, etc. An alkoxysulfonylamino group such as a methoxycarbonylamino group; an alkylsulfonylamino group such as a methylsulfonylamino group; an arylsulfonylamino group such as a phenylsulfonylamino group or a p-toluenesulfonylamino group; an N-ethylcarbamoyl group; N, N- A carbamoyl group such as butylcarbamoyl group; a sulfamoyl group such as N-ethylsulfamoyl group, N, N-dipropylsulfamoyl group, N-phenylsulfamoyl group; methylsulfonyl group, octylsulfonyl group, phenylsulfonyl group; sulfonyl groups such as p-toluenesulfonyl group; alkoxycarbonyl groups such as methoxycarbonyl group and butyloxycarbonyl group; heterocyclic oxy groups such as 1-phenyltetrazol-5-oxy group and 2-tetrahydropyranyloxy group; phenylazo group , 4-methoxyphenylazo group, 4-pivaloylaminophenylazo group, 2-hydroxy-4-propanoylphenylazo group, etc .; acyloxy group such as acetoxy group; N-methylcarbamoyloxy group, N- Phenylcarbamoyloxy group, etc. Carbamoyloxy group; silyloxy group such as trimethylsilyloxy group and dibutylmethylsilyloxy group; aryloxycarbonylamino group such as phenoxycarbonylamino group; imide group such as N-succinimide group and N-phthalimide group; 2-benzothiazolylthio A heterocyclic thio group such as a group, 2,4-di-phenoxy-1,3,5-triazole-6-thio group or 2-pyridylthio group; a sulfinyl group such as a 3-phenoxypropylsulfinyl group; a phenoxyphosphonyl group; Phosphonyl groups such as octyloxyphosphonyl group and phenylphosphonyl group; aryloxycarbonyl groups such as phenoxycarbonyl group; acyl groups such as acetyl group, 3-phenylpropanoyl group and benzoyl group; carboxyl group, sulfo group and phosphono group Quaternary ammonium group Such ionic hydrophilic group. The alkyl group, the aralkyl group, the alkenyl group, the alkynyl group, the cycloalkyl group, and the cycloalkenyl group, which are substituents of the substituted alkyl group, are from the viewpoint of improving the solubility of the dye and the stability of the ink. Those having a branched chain are preferred, and those having an asymmetric carbon are particularly preferred. Among these, preferred substituents of the substituted alkyl group are a hydroxy group, an alkoxy group, a cyano group, a halogen atom, a sulfo group (may be in the form of a salt), and a carboxyl group (may be in the form of a salt).

  The cycloalkyl group includes a substituted or unsubstituted cycloalkyl group. The substituted or unsubstituted cycloalkyl group is preferably a cycloalkyl group having 5 to 30 carbon atoms. Examples of the substituent of the substituted cycloalkyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the cycloalkyl group include a cyclohexyl group, a cyclopentyl group, and 4-n-dodecylcyclohexyl group.

  The aralkyl group includes a substituted or unsubstituted aralkyl group. The substituted or unsubstituted aralkyl group is preferably an aralkyl group having 7 to 30 carbon atoms. Examples of the substituent of the substituted aralkyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the aralkyl group include benzyl group and 2-phenethyl group.

  The alkenyl group is a linear, branched, or cyclic substituted or unsubstituted alkenyl group. The alkenyl group is preferably a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms. Examples of the substituent of the substituted alkenyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkenyl group include a vinyl group, allyl group, prenyl group, geranyl group, oleyl group, 2-cyclopenten-1-yl group, and cyclohexen-1-yl group.

  The alkynyl group is a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms. Examples of the substituent of the substituted alkynyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkynyl group include ethynyl group and propargyl group.

  The aryl group is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms. Examples of the aryl group include a phenyl group, p-tolyl group, naphthyl group, m-chlorophenyl group, o-hexadecanoylaminophenyl group, and the like. Examples of the substituent of the substituted aryl group include the same substituents as the substituents of the substituted alkyl group.

  The heterocyclic group is a monovalent group obtained by removing one hydrogen atom from a 5- or 6-membered substituted or unsubstituted aromatic or non-aromatic heterocyclic compound, and these are further condensed. Also good. The heterocyclic group is preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms. Examples of the substituent of the substituted heterocyclic group include the same substituents as the substituents of the substituted alkyl group. Examples of the heterocyclic group include, but are not limited to, substitution positions such as pyridine group, pyrazine group, pyridazine group, pyrimidine group, triazine group, quinoline group, isoquinoline group, quinazoline group, cinnoline group, phthalazine group, quinoxaline group, pyrrole. Group, indole group, furan group, benzofuran group, thiophene group, benzothiophene group, pyrazole group, imidazole group, benzimidazole group, triazole group, oxazole group, benzoxazole group, thiazole group, benzothiazole group, isothiazole group, benz Examples include isothiazole group, thiadiazole group, isoxazole group, benzisoxazole group, pyrrolidine group, piperidine group, piperazine group, imidazolidine group, thiazoline group and the like.

  The alkoxy group includes a substituted or unsubstituted alkoxy group. The substituted or unsubstituted alkoxy group is preferably an alkoxy group having 1 to 30 carbon atoms. Examples of the substituent of the substituted alkoxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkoxy group include a methoxy group, an ethoxy group, an isopropoxy group, an n-octyloxy group, a methoxyethoxy group, a hydroxyethoxy group, and a 3-carboxypropoxy group.

  The aryloxy group is preferably a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms. Examples of the substituent of the substituted aryloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the aryloxy group include a phenoxy group, 2-methylphenoxy group, 4-t-butylphenoxy group, 3-nitrophenoxy group, 2-tetradecanoylaminophenoxy group, and the like.

  The silyloxy group is preferably a silyloxy group having 3 to 20 carbon atoms. Examples of the silyloxy group include a trimethylsilyloxy group and a t-butyldimethylsilyloxy group.

  The heterocyclic oxy group is preferably a substituted or unsubstituted heterocyclic oxy group having 2 to 30 carbon atoms. Examples of the substituent of the substituted heterocyclic oxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the heterocyclic oxy group include 1-phenyltetrazol-5-oxy group, 2-tetrahydropyranyloxy group and the like.

  The acyloxy group is preferably a formyloxy group, a substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, and a substituted or unsubstituted arylcarbonyloxy group having 6 to 30 carbon atoms. Examples of the substituent of the substituted alkylcarbonyloxy group and the substituted arylcarbonyloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the acyloxy group include formyloxy group, acetyloxy group, pivaloyloxy group, stearoyloxy group, benzoyloxy group, p-methoxyphenylcarbonyloxy group and the like.

  The carbamoyloxy group is preferably a substituted or unsubstituted carbamoyloxy group having 1 to 30 carbon atoms. Examples of the substituent of the substituted carbamoyloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the carbamoyloxy group include N, N-dimethylcarbamoyloxy group, N, N-diethylcarbamoyloxy group, morpholinocarbonyloxy group, N, N-di-n-octylaminocarbonyloxy group, Nn- Examples include octylcarbamoyloxy group.

  The alkoxycarbonyloxy group is preferably a substituted or unsubstituted alkoxycarbonyloxy group having 2 to 30 carbon atoms. Examples of the substituent of the substituted alkoxycarbonyloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkoxycarbonyloxy group include a methoxycarbonyloxy group, an ethoxycarbonyloxy group, a t-butoxycarbonyloxy group, and an n-octylcarbonyloxy group.

  The aryloxycarbonyloxy group is preferably a substituted or unsubstituted aryloxycarbonyloxy group having 7 to 30 carbon atoms. Examples of the substituent of the substituted aryloxycarbonyloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the aryloxycarbonyloxy group include a phenoxycarbonyloxy group, a p-methoxyphenoxycarbonyloxy group, a pn-hexadecyloxyphenoxycarbonyloxy group, and the like.

  The amino group is preferably a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms and a substituted or unsubstituted arylamino group having 6 to 30 carbon atoms. Examples of the substituent of the substituted alkylamino group and the substituted arylamino group include the same substituents as those exemplified as the substituent of the substituted alkyl group. Examples of the amino group include amino group, methylamino group, dimethylamino group, anilino group, N-methyl-anilino group, diphenylamino group, hydroxyethylamino group, carboxyethylamino group, sulfoethylamino group, 3 , 5-dicarboxyanilino group and the like.

  The acylamino group is preferably a formylamino group, a substituted or unsubstituted alkylcarbonylamino group having 1 to 30 carbon atoms, and a substituted or unsubstituted arylcarbonylamino group having 6 to 30 carbon atoms. Examples of the substituent of the substituted alkylcarbonylamino group and the substituted arylcarbonylamino group include the same substituents as those exemplified as the substituent of the substituted alkyl group. Examples of the acylamino group include formylamino group, acetylamino group, pivaloylamino group, lauroylamino group, benzoylamino group, 3,4,5-tri-n-octyloxyphenylcarbonylamino group, and the like.

  The aminocarbonylamino group is preferably a substituted or unsubstituted aminocarbonylamino group having 1 to 30 carbon atoms. Examples of the substituent of the substituted aminocarbonylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the aminocarbonylamino group include carbamoylamino group, N, N-dimethylaminocarbonylamino group, N, N-diethylaminocarbonylamino group, morpholinocarbonylamino group, and the like.

  The alkoxycarbonylamino group is preferably a substituted or unsubstituted alkoxycarbonylamino group having 2 to 30 carbon atoms. Examples of the substituent of the substituted alkoxycarbonylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkoxycarbonylamino group include a methoxycarbonylamino group, an ethoxycarbonylamino group, a t-butoxycarbonylamino group, an n-octadecyloxycarbonylamino group, and an N-methyl-methoxycarbonylamino group.

  The aryloxycarbonylamino group is preferably a substituted or unsubstituted aryloxycarbonylamino group having 7 to 30 carbon atoms. Examples of the substituent of the substituted aryloxycarbonylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the aryloxycarbonylamino group include phenoxycarbonylamino group, p-chlorophenoxycarbonylamino group, mn-octyloxyphenoxycarbonylamino group, and the like.

  The sulfamoylamino group is preferably a substituted or unsubstituted sulfamoylamino group having 0 to 30 carbon atoms. Examples of the substituent of the substituted sulfamoylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the sulfamoylamino group include a sulfamoylamino group, an N, N-dimethylaminosulfonylamino group, and an Nn-octylaminosulfonylamino group.

  The alkylsulfonylamino group is preferably a substituted or unsubstituted alkylsulfonylamino group having 1 to 30 carbon atoms. Examples of the substituent of the substituted alkylsulfonylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkylsulfonylamino group include a methylsulfonylamino group and a butylsulfonylamino group.

  The arylsulfonylamino group is preferably a substituted or unsubstituted arylsulfonylamino group having 6 to 30 carbon atoms. Examples of the substituent of the substituted arylsulfonylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the arylsulfonylamino group include a phenylsulfonylamino group, a 2,3,5-trichlorophenylsulfonylamino group, a p-methylphenylsulfonylamino group, and the like.

  The alkylthio group is preferably a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms. Examples of the substituent of the substituted alkylthio group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkylthio group include a methylthio group, an ethylthio group, and an n-hexadecylthio group.

  The arylthio group is preferably a substituted or unsubstituted arylthio group having 6 to 30 carbon atoms. Examples of the substituent for the substituted arylthio group include the same substituents as the substituents for the substituted alkyl group. Examples of the arylthio group include a phenylthio group, a p-chlorophenylthio group, and an m-methoxyphenylthio group.

  The heterocyclic thio group is preferably a substituted or unsubstituted heterocyclic thio group having 2 to 30 carbon atoms. Examples of the substituent of the substituted heterocyclic thio group include the same substituents as the substituents of the substituted alkyl group. Examples of the heterocyclic thio group include 2-benzothiazolylthio group and 1-phenyltetrazol-5-ylthio group.

  The sulfamoyl group is preferably a substituted or unsubstituted sulfamoyl group having 0 to 30 carbon atoms. Examples of the substituent of the substituted sulfamoyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the sulfamoyl group include an N-ethylsulfamoyl group, an N- (3-dodecyloxypropyl) sulfamoyl group, an N, N-dimethylsulfamoyl group, an N-acetylsulfamoyl group, and an N-benzoylsulfur group. Examples include a famoyl group and an N- (N′-phenylcarbamoyl) sulfamoyl group.

  The alkylsulfinyl group is preferably a substituted or unsubstituted alkylsulfinyl group having 1 to 30 carbon atoms. Examples of the substituent of the substituted alkylsulfinyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkylsulfinyl group include a methylsulfinyl group and an ethylsulfinyl group.

  The arylsulfinyl group is preferably a substituted or unsubstituted arylsulfinyl group having 6 to 30 carbon atoms. Examples of the substituent of the substituted arylsulfinyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the arylsulfinyl group include a phenylsulfinyl group and a p-methylphenylsulfinyl group.

  The alkylsulfonyl group is preferably a substituted or unsubstituted alkylsulfonyl group having 1 to 30 carbon atoms. Examples of the substituent of the substituted alkylsulfonyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkylsulfonyl group include a methylsulfonyl group and an ethylsulfonyl group.

  The arylsulfonyl group is preferably a substituted or unsubstituted arylsulfonyl group having 6 to 30 carbon atoms. Examples of the substituent of the substituted arylsulfonyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the arylsulfonyl group include a phenylsulfonyl group and a p-toluenesulfonyl group.

  The acyl group is preferably a formyl group, a substituted or unsubstituted alkylcarbonyl group having 2 to 30 carbon atoms, a substituted or unsubstituted arylcarbonyl group having 7 to 30 carbon atoms, or a 4 to 30 carbon atoms. A heterocyclic carbonyl group bonded to a carbonyl group with a substituted or unsubstituted carbon atom. Examples of the substituent of the substituted alkylcarbonyl group, the substituted arylcarbonyl group, and the heterocyclic carbonyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the acyl group include an acetyl group, a pivaloyl group, a 2-chloroacetyl group, a stearoyl group, a benzoyl group, a pn-octyloxyphenylcarbonyl group, a 2-pyridylcarbonyl group, and a 2-furylcarbonyl group. It is done.

  The aryloxycarbonyl group is preferably a substituted or unsubstituted aryloxycarbonyl group having 7 to 30 carbon atoms. Examples of the substituent of the substituted aryloxycarbonyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the aryloxycarbonyl group include a phenoxycarbonyl group, an o-chlorophenoxycarbonyl group, an m-nitrophenoxycarbonyl group, and a pt-butylphenoxycarbonyl group.

  The alkoxycarbonyl group is preferably a substituted or unsubstituted alkoxycarbonyl group having 2 to 30 carbon atoms. Examples of the substituent of the substituted alkoxycarbonyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the alkoxycarbonyl group include a methoxycarbonyl group, an ethoxycarbonyl group, a t-butoxycarbonyl group, and an n-octadecyloxycarbonyl group.

  The carbamoyl group is preferably a substituted or unsubstituted carbamoyl group having 1 to 30 carbon atoms. Examples of the substituent of the substituted carbamoyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the carbamoyl group include a carbamoyl group, an N-methylcarbamoyl group, an N, N-dimethylcarbamoyl group, an N, N-di-n-octylcarbamoyl group, and an N- (methylsulfonyl) carbamoyl group.

  The phosphino group is preferably a substituted or unsubstituted phosphino group having 2 to 30 carbon atoms. Examples of the substituent of the substituted phosphino group include the same substituents as the substituents of the substituted alkyl group. Examples of the phosphino group include a dimethylphosphino group, a diphenylphosphino group, and a methylphenoxyphosphino group.

  The phosphinyl group is preferably a substituted or unsubstituted phosphinyl group having 2 to 30 carbon atoms. Examples of the substituent of the substituted phosphinyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the phosphinyl group include a phosphinyl group, a dioctyloxyphosphinyl group, a diethoxyphosphinyl group, and the like.

  The phosphinyloxy group is preferably a substituted or unsubstituted phosphinyloxy group having 2 to 30 carbon atoms. Examples of the substituent of the substituted phosphinyloxy group include the same substituents as the substituents of the substituted alkyl group. Examples of the phosphinyloxy group include a diphenoxyphosphinyloxy group and a dioctyloxyphosphinyloxy group.

  The phosphinylamino group is preferably a substituted or unsubstituted phosphinylamino group having 2 to 30 carbon atoms. Examples of the substituent of the substituted phosphinylamino group include the same substituents as the substituents of the substituted alkyl group. Examples of the phosphinylamino group include a dimethoxyphosphinylamino group and a dimethylaminophosphinylamino group.

  The silyl group is preferably a substituted or unsubstituted silyl group having 3 to 30 carbon atoms. Examples of the substituent of the substituted silyl group include the same substituents as the substituents of the substituted alkyl group. Examples of the silyl group include a trimethylsilyl group, a t-butyldimethylsilyl group, and a phenyldimethylsilyl group.

  Examples of the azo group include a phenylazo group, a 4-methoxyphenylazo group, a 4-pivaloylaminophenylazo group, a 2-hydroxy-4-propanoylphenylazo group, and the like.

  Examples of the imide group include an N-succinimide group and an N-phthalimide group.

In the general formula (1), X ₁ and X ₂ are each an electron-withdrawing group, and X ₁ and X ₂ may be the same or different. Examples of X ₁ and X ₂ include an acyl group, an acyloxy group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, a dialkylphosphono group, a diarylphosphono group, and a diarylphosphinyl group. Alkylsulfinyl group, arylsulfinyl group, alkylsulfonyl group, arylsulfonyl group, sulfonyloxy group, acylthio group, sulfamoyl group, thiocyanate group, thiocarbonyl group, halogenated alkyl group, halogenated alkoxy group, halogenated aryloxy group, Examples thereof include a halogenated alkylamino group, a halogenated alkylthio group, an aryl group substituted with another electron-withdrawing group, a heterocyclic group, a halogen atom, an azo group, and a selenocyanate group.

X ₁ and X ₂ are preferably an acyl group having 2 to 12 carbon atoms, an acyloxy group having 2 to 12 carbon atoms, a carbamoyl group having 1 to 12 carbon atoms, or an alkoxycarbonyl having 2 to 12 carbon atoms. Group, aryloxycarbonyl group having 7 to 18 carbon atoms, cyano group, nitro group, alkylsulfinyl group having 1 to 12 carbon atoms, arylsulfinyl group having 6 to 18 carbon atoms, alkyl having 1 to 12 carbon atoms Sulfonyl group, arylsulfonyl group having 6 to 18 carbon atoms, sulfamoyl group having 0 to 12 carbon atoms, halogenated alkyl group having 1 to 12 carbon atoms, halogenated alkoxy group having 1 to 12 carbon atoms, carbon atom A halogenated alkylthio group having 1 to 12 carbon atoms, a halogenated aryloxy group having 7 to 18 carbon atoms, and two or more other electron-withdrawing groups Substituted aryl group having a carbon number of 7 to 18, a nitrogen atom, an oxygen atom or a heterocyclic group having 1 to 18 carbon atoms in the 5- to 8-membered ring having a sulfur atom.

In the general formula (1), Z ₁ and Z ₂ are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, or a substituted or unsubstituted aralkyl. A group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, and Z ₁ and Z ₂ may be the same or different. The alkyl group, the alkenyl group, the alkynyl group, the aralkyl group, the aryl group, and the heterocyclic group are the same as those in R ₁ , R ₂ , Y _1, and Y ₂ .

In the general formula (1), M is a hydrogen atom or a cation. The cation is an alkali metal ion, an ammonium ion, or a quaternary ammonium ion. The cation is preferably Li, Na, K, NH ₄ , or NR ₄ . Here, R in R ₄ is an alkyl group or an aryl group, and is the same as in R ₁ , R ₂ , Y ₁ and Y ₂ . Among these, the cation, Li, Na, K, is preferably NH _4.

  As a preferable combination of substituents of the dye represented by the general formula (1), it is preferable that at least one of various substituents is the above preferable group, and more various substituents are the above preferable groups. It is more preferable that all the substituents are the above-mentioned preferable groups.

  Particularly preferred combinations of substituents of the dye represented by the general formula (1) include the following (a) to (e).

(I) R ₁ and R ₂ may be the same or different, and are preferably a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, or a substituted or unsubstituted carbon atom having 6 to 18 carbon atoms in total. An aryl group, a substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms in total, more preferably a linear or branched alkyl group having 1 to 8 carbon atoms in total, more preferably secondary or A tertiary alkyl group, most preferably a t-butyl group.

(B) X ₁ and X ₂ are each an electron-withdrawing group, and may be the same or different, and are preferably a cyano group, an alkylsulfonyl group having 1 to 12 carbon atoms, and 6 to 18 carbon atoms. And a sulfamoyl group having 0 to 12 carbon atoms, more preferably a cyano group and an alkylsulfonyl group having 1 to 12 carbon atoms.

(C) Y ₁ and Y ₂ may be the same or different, and are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 12 total carbon atoms, or a substituted or unsubstituted total carbon number of 6 An aryl group having 18 to 18 carbon atoms, a substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms in total, more preferably a hydrogen atom or a substituted or unsubstituted alkyl group, and most preferably a hydrogen atom.

(D) Z ₁ and Z ₂ may be the same or different and are preferably a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, or a substituted or unsubstituted carbon atom having 6 to 18 carbon atoms in total. An aryl group, a substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms in total, more preferably a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, and particularly preferably a substituted group. An aryl group.

(E) M is preferably a hydrogen atom, an alkali metal ion, an ammonium ion, or a quaternary ammonium ion, and more preferably a hydrogen atom, Li, Na, K, or NH ₄ .

  Preferable specific examples of the dye (1) include compounds represented by the following structural formulas (1-A) to (1-E).

  The blending amount of the dye (1) is not particularly limited. By including the dye (1) in the ink, the fastness of the recorded matter using the ink can be improved. The blending amount of the dye (1) is, for example, 0.07 to 6.3% by weight, preferably 0.14 to 4.5% by weight, based on the total amount of the ink.

  C. of the dye (2) I. Direct yellow 86 is, for example, a dye represented by the following structural formula (2).

The compounding quantity of the said dye (2) is 0.27 to 0.54 weight% as above-mentioned . By including the dye (2) in the ink, sharpness and color development can be improved .

As described above, the weight ratio of the dye (1) and the dye (2) in the ink, the dye (1): Dye (2) = 8: 2-9: Ru 1 der. By setting the weight ratio in the above range, it is possible to obtain an ink that is more excellent in storage stability and more excellent in fastness of recorded matter using the ink. The storage stability is improved beyond an arithmetic average intermediate level between the dye (1) and the dye (2) .

  The colorant may be composed only of the dye (1) and the dye (2), and may further contain other dyes and pigments.

  The water is preferably ion exchange water or pure water. The blending amount of the water with respect to the total amount of the ink is, for example, 10 to 90% by weight, and preferably 40 to 80% by weight. The blending amount of water may be, for example, the balance of other components.

  The water-soluble organic solvent is classified into, for example, a wetting agent that prevents the ink from drying at the tip of the ink jet head and a penetrating agent that adjusts the drying speed on the recording paper surface.

  The wetting agent is not limited, and examples thereof include lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, and t-butyl alcohol; dimethylformamide, dimethylacetamide, and the like. Amides; ketones such as acetone; keto alcohols such as diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyhydric alcohols such as polyalkylene glycol, alkylene glycol, and glycerin; 2-pyrrolidone; N-methyl-2-pyrrolidone; , 3-dimethyl-2-imidazolidinone and the like. The polyalkylene glycol is not limited, and examples thereof include polyethylene glycol and polypropylene glycol. The alkylene glycol is not limited, and examples thereof include ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, and hexylene glycol. Among these, polyhydric alcohols such as alkylene glycol and glycerin are preferable. These wetting agents may be used alone or in combination of two or more.

  The blending amount of the wetting agent is not particularly limited. The blending amount of the wetting agent with respect to the total amount of the ink is, for example, 0 to 95% by weight, preferably 10 to 80% by weight, and more preferably 10 to 50% by weight.

  As the wetting agent, glycerin is particularly preferable. Compared with other solvents, the glycerin is excellent in safety, is very easily dissolved in water, and is excellent in moisture absorption and moisture retention. As described above, the blending amount of the glycerin with respect to the total amount of the ink is preferably 5 to 40% by weight.

  The penetrant is not limited, and examples thereof include glycol ethers. The glycol ether is not limited, for example, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol propyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol propyl ether, diethylene glycol butyl ether, triethylene glycol methyl ether, triethylene. Glycol ethyl ether, triethylene glycol propyl ether, triethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol propyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether Ether, dipropylene glycol propyl ether, dipropylene glycol butyl ether, tripropylene glycol methyl ether, tripropylene glycol ethyl ether, tripropylene glycol propyl ether and tripropylene glycol butyl ether, and the like. The said penetrant may be used individually by 1 type, and may use 2 or more types together.

  The blending amount of the penetrant is, for example, 0 to 20% by weight. By setting the blending amount of the penetrant within the above range, the penetrability of the ink into paper can be made more suitable. The blending amount of the penetrant is preferably 0.1 to 15% by weight, and more preferably 0.5 to 10% by weight.

  The ink may further contain a conventionally known additive as required. Examples of the additive include a surfactant, a viscosity modifier, a surface tension modifier, and an antifungal agent. The viscosity modifier is not limited, and examples thereof include polyvinyl alcohol, cellulose, and a water-soluble resin.

  The ink can be prepared, for example, by uniformly mixing a colorant, water, a water-soluble organic solvent, and, if necessary, other additive components by a conventionally known method, and removing insoluble matters with a filter. .

  As described above, the ink of the present invention can be used as, for example, a yellow ink. However, the present invention is not limited to this. The ink of the present invention can be made into an ink of a color other than yellow by using a colorant other than the dye (1) and the dye (2).

  The ink cartridge of the present invention is an ink cartridge containing the ink for inkjet recording of the present invention. As the main body of the ink cartridge of the present invention, for example, a conventionally known one can be used.

  Next, the ink jet recording apparatus of the present invention will be described. The ink jet recording apparatus of the present invention includes the ink cartridge of the present invention. Except for this, the configuration of the ink jet recording apparatus of the present invention may be the same as that of a conventionally known ink jet recording apparatus, for example.

  FIG. 1 shows the configuration of an example of the ink jet recording apparatus of the present invention. As shown in the figure, the ink jet recording apparatus 1 includes four ink cartridges 2, an ink jet head 3, a head unit 4, a carriage 5, a drive unit 6, a platen roller 7, and a purge device 8. Including as a member.

  The four ink cartridges 2 contain one color each of four colors of yellow, magenta, cyan, and black. For example, the yellow ink is the ink of the present invention. The ink jet head 3 performs printing on a recording material P such as recording paper. The head unit 4 includes the inkjet head 3. The four ink cartridges 2 and the head unit 4 are mounted on the carriage 5. The drive unit 6 reciprocates the carriage 5 in a linear direction. The platen roller 7 extends in the reciprocating direction of the carriage 5 and is disposed to face the ink jet head 3.

  The drive unit 6 includes a carriage shaft 9, a guide plate 10, two pulleys 11 and 12, and an endless belt 13. The carriage shaft 9 is disposed at the lower end of the carriage 5 and extends in parallel with the platen roller 7. The guide plate 10 is disposed at the upper end of the carriage unit 5 and extends in parallel with the carriage shaft 9. The two pulleys 11 and 12 are disposed between the carriage shaft 9 and the guide plate 10 at both ends of the carriage shaft 9. The endless belt 13 is stretched between the two pulleys 11 and 12.

  In the ink jet recording apparatus 1, when the pulley 11 is rotated forward and backward by driving the carriage motor 101, the carriage 5 joined to the endless belt 13 is moved along with the forward and reverse rotation of the pulley 11. Along the carriage shaft 9 and the guide plate 10, it reciprocates in a linear direction.

  The recording material P is fed from a paper feed cassette (not shown) provided on the side or lower side of the ink jet recording apparatus 1. The recording material P is introduced between the inkjet head 3 and the platen roller 7. Then, predetermined printing is performed on the recording material P by the ink ejected from the inkjet head 3. Thereafter, the recording material P is discharged from the ink jet recording apparatus 1. In FIG. 1, the paper feed mechanism and paper discharge mechanism for the recording material P are not shown.

  The purge device 8 is provided on the side of the platen roller 7 so as to face the inkjet head 3 when the head unit 4 is at a reset position (in this example, the upper portion of the purge device 8). Has been placed. The purge device 8 includes a purge cap 14, a pump 15 and a cam 16, and an ink storage unit 17. The purge cap 14 covers a plurality of nozzles (not shown) of the inkjet head 3 when the head unit 4 is in the reset position. The pump 15 sucks out defective ink containing bubbles and the like accumulated in the ink jet head 3 by driving the cam 16. Thereby, recovery of the inkjet head is achieved. The sucked defective ink is stored in the ink storage unit 17.

  A wiper member 20 is disposed adjacent to the purge device 8 at a position on the platen roller 7 side of the purge device 8. The wiper member 20 is formed in a spatula shape, and wipes the nozzle forming surface of the inkjet head 3 as the carriage 5 moves. In FIG. 1, a cap 18 covers a plurality of nozzles of the inkjet head 3 that is returned to the reset position when printing is completed in order to prevent ink from drying.

  In the ink jet recording apparatus 1 of this example, the four ink cartridges 2 are mounted on one carriage 5. However, the present invention is not limited to this. In the ink jet recording apparatus of the present invention, the four ink cartridges may be mounted on a plurality of carriages. Further, the ink cartridge may not be mounted on the carriage but may be arranged and fixed in the ink jet recording apparatus. In this aspect, for example, the ink cartridge and the head unit mounted on the carriage are connected by a tube or the like, and the ink is supplied from the ink cartridge to the head unit by the tube or the like.

Next, examples of the present invention will be described together with reference examples and comparative examples. The present invention is not limited or limited by the following examples , reference examples and comparative examples.

[Examples 1 and 2, Reference Examples 1 to 3 and Comparative Examples 1 and 2]
The ink composition components (Table 1 below) were mixed uniformly. Thereafter, the obtained mixture was filtered using a hydrophilic polytetrafluoroethylene (PTFE) type membrane filter (pore diameter 0.2 μm) manufactured by Toyo Roshi Kaisha, Ltd., so that Examples 1 and 2 and Reference Example 1 were used. To 3 and Comparative Examples 1 and 2 were obtained. In Table 1, dyes (1-A) to (1-E) are compounds represented by the structural formulas (1-A) to (1-E), respectively.

For the inks of the examples , reference examples and comparative examples, (a) storage stability evaluation, (b) ozone resistance evaluation, (c) light resistance evaluation and (d) comprehensive evaluation are performed by the following methods. It was. Samples for (b) ozone resistance evaluation and (c) light resistance evaluation were prepared as follows.

That is, first, the ink of each example , each reference example, and each comparative example was filled in an ink cartridge. Subsequently, the ink cartridge was mounted on a digital multifunction device DCP-330C equipped with an inkjet printer manufactured by Brother Industries, Ltd. Next, the ink gradation sample was printed on photographic glossy paper BP61GLA manufactured by Brother Industries, Ltd. to obtain a patch having an initial OD value of 1.0. The OD value was measured with a spectrocolorimeter Spectrolino (light source: D ₆₅ ; field of view: 2 °; status A) manufactured by Gretag Macbeth.

(A) Evaluation of Storage Stability The absorbance at a wavelength of 440 nm of a diluted solution obtained by diluting the ink of each Example , each Reference Example, and each Comparative Example with pure water at 1600 times was obtained by using UV-Vis Near-Infrared manufactured by Shimadzu Corporation. Measurement was performed using a spectrophotometer UV3600. A measurement cell having a cell length of 10 mm was used for measuring the absorbance. Subsequently, the ink was separately put in a sealed container and stored in an environment of a temperature of 60 ° C. for 2 weeks. Next, the absorbance of a diluted solution obtained by diluting the ink after the storage with pure water 1600 times was measured in the same manner as before the storage. Next, the absorbance decrease rate (%) was determined by the following formula (I), and the storage stability was evaluated according to the following evaluation criteria. In addition, the smaller the absorbance decrease rate, the more the decomposition of the dye (1) is suppressed and the storage stability is excellent.

Absorbance decrease rate (%) = {(XY) / X} × 100 (I)
X: Absorbance before storage Y: Absorbance after storage

Storage stability evaluation criteria G: Absorbance decrease rate is less than 10% NG: Absorbance decrease rate is 10% or more

(B) Evaluation of ozone resistance Using the ozone weather meter OMS-H manufactured by Suga Test Instruments Co., Ltd., the gradation sample was measured under the conditions of ozone concentration 2 ppm, tank temperature 24 ° C., tank relative humidity 60%. Left for hours. Subsequently, the OD value of the patch after the standing was measured in the same manner as described above. Next, the OD value reduction rate (%) was obtained by the following formula (II), and the ozone resistance was evaluated according to the following evaluation criteria. Note that the smaller the OD value reduction rate, the less the deterioration of image quality and the better the ozone resistance.

OD value reduction rate (%) = {(XY) / X} × 100 (II)
X: 1.0 (initial OD value)
Y: OD value after standing

Ozone resistance evaluation standard G: OD value reduction rate is less than 20% NG: OD value reduction rate is 20% or more

(C) Light resistance evaluation Using the high energy xenon weather meter SC750-WN manufactured by Suga Test Instruments Co., Ltd., the gradation sample was subjected to xenon under the conditions of a bath temperature of 25 ° C., a bath relative humidity of 50%, and an illuminance of 93 klx. Lamp light was irradiated for 200 hours. Subsequently, the OD value of the patch after the irradiation was measured in the same manner as described above. Next, the OD value reduction rate (%) was obtained by the following formula (III), and the light resistance was evaluated according to the following evaluation criteria. Note that the smaller the OD value reduction rate, the less the image quality is deteriorated and the better the light resistance.

OD value reduction rate (%) = {(XY) / X} × 100 (III)
X: 1.0 (initial OD value)
Y: OD value after irradiation

Light resistance evaluation standard G: OD value reduction rate is less than 30% NG: OD value reduction rate is 30% or more

(D) Comprehensive evaluation About each ink, comprehensive evaluation was performed from the result of said (a)-(c) according to the following evaluation criteria.

Overall evaluation criteria G: All evaluation results were G.
NG: NG was found in any of the evaluation results.

Table 1 below shows the compositions and evaluation results of the inks of the examples , the reference examples, and the comparative examples. In Table 1, the predicted value of the absorbance decrease rate in the storage stability evaluation is an arithmetic average intermediate level between the dye (1) and the dye (2).

As shown in Table 1, the following knowledge was obtained from each example , each reference example, and each comparative example.

Example 1 (total amount of dye: 2.7% by weight): The weight ratio of the dye (1) and the dye (2) contains 90% of the dye (1), thereby evaluating the ozone resistance and the light resistance. The result was good. Further, by containing 10% of the dye (2) at the weight ratio, a decrease in absorbance due to the decomposition of the dye (1) was suppressed, and the results of storage stability evaluation were good. This improvement in storage stability was about 4% higher than the arithmetic mean intermediate level (predicted value) between dye (1) and dye (2). Further, below the dye (1): Dye (2) = 7: 3 Der Ri, OD decrease in light resistance evaluation than Example 1-3 proportion of the dye (2) exceeds 0.54 wt% The rate was low and the light resistance was particularly excellent. Moreover, the light absorbency reduction rate in storage stability evaluation was substantially equivalent to the reference examples 1-3, and the high storage stability was shown.

Example 2 (total amount of dye: 2.7% by weight): Evaluation of ozone resistance and light resistance by including 80% of dye (1) in a weight ratio of dye (1) and dye (2) The result was good. Further, by containing 20% of the dye (2) at the weight ratio, the decrease in absorbance due to the decomposition of the dye (1) was suppressed, and the results of the storage stability evaluation were good. The improvement in the rate of decrease in absorbance in the storage stability was about 3% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). Further, below the dye (1): Dye (2) = 7: 3 Der Ri, OD decrease in light resistance evaluation than Example 1-3 proportion of the dye (2) exceeds 0.54 wt% The rate was low and the light resistance was particularly excellent. Moreover, the light absorbency reduction rate in storage stability evaluation was substantially equivalent to the reference examples 1-3, and the high storage stability was shown.

Reference Example 1 (Total amount of dye: 2.7% by weight): The weight ratio of dye (1) and dye (2) contains 70% of dye (1), thereby evaluating ozone resistance and light resistance. The result was good. Further, by containing 30% of the dye (2) at the weight ratio, the decrease in absorbance due to the decomposition of the dye (1) was suppressed, and the results of storage stability evaluation were good. The improvement in the rate of decrease in absorbance in the storage stability was about 2% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

Reference Example 2 (Total amount of dye: 2.5% by weight): Ozone resistance evaluation and light resistance evaluation by including 70% of dye (1) in a weight ratio of dye (1) and dye (2) The result was good. Further, by containing 30% of the dye (2) at the weight ratio, the decrease in absorbance due to the decomposition of the dye (1) was suppressed, and the results of storage stability evaluation were good. The improvement in the rate of decrease in absorbance in the storage stability was about 3% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

Reference Example 3 (Total amount of dye: 3.5% by weight): Ozone resistance evaluation and light resistance evaluation by including 70% of dye (1) in a weight ratio of dye (1) and dye (2) The result was good. Further, by containing 30% of the dye (2) at the weight ratio, the decrease in absorbance due to the decomposition of the dye (1) was suppressed, and the results of storage stability evaluation were good. The improvement in the rate of decrease in absorbance in the storage stability was about 2% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

  Comparative Example 1 (Total dye content: 2.7% by weight): By including the dye (1), the results of ozone resistance evaluation and light resistance evaluation were good. However, the result of storage stability evaluation was inferior by not containing dye (2).

  Comparative Example 2 (Total dye content: 2.7% by weight): By including the dye (2), the results of the storage stability evaluation were good. However, due to the absence of dye (1), the results of ozone resistance evaluation and light resistance evaluation were inferior.

  As described above, the ink of the present invention is excellent in sharpness, color developability and storage stability, and is excellent in the fastness of recorded matter using the ink of the present invention. The use of the ink of the present invention is not limited and can be widely applied to various ink jet recordings.

FIG. 1 is a schematic perspective view showing an example of the configuration of the ink jet recording apparatus of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 2 Ink cartridge 3 Inkjet head 4 Head unit 5 Carriage 6 Drive unit 7 Platen roller 8 Purge device 9 Carriage shaft 10 Guide plate

Claims (8)

An inkjet recording ink comprising a colorant, water and a water-soluble organic solvent,
The colorant includes the following dye (1) and dye (2),
The weight ratio of the dye (1) and the dye (2) in the ink is dye (1): dye (2) = 8: 2 to 9: 1,
An ink for inkjet recording, wherein the blending amount of the dye (2) with respect to the total amount of the ink is 0.27 to 0.54% by weight.
Dye (1): Dye dye (2) represented by the following general formula (1): C.I. I. Direct yellow 86

In the general formula (1),
R ₁ and R ₂ are each a monovalent group, the monovalent group represents a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, or a aralkyl group or aryl group, R ₁ and R ₂ may be the same or different,
Y ₁ and Y ₂ are each a monovalent group, and the monovalent group includes a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, and a heterocyclic ring. Group, cyano group, hydroxyl group, nitro group, alkoxy group, aryloxy group, silyloxy group, heterocyclic oxy group, acyloxy group, carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group, amide group, Acylamino group, ureido group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfamoylamino group, alkylsulfonylamino group, arylsulfonylamino group, alkylthio group, arylthio group, heterocyclic thio group, sulfamoyl Alkylsulfinyl group, arylsulfinyl group, alkylsulfonyl group, arylsulfonyl group, acyl group, aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group, phosphino group, phosphinyl group, phosphinyloxy group, phosphinylamino group, silyl group, or a azo group or imide group, Y ₁ and Y ₂ may be different even identical,
X ₁ and X ₂ are each an electron-withdrawing group, and the electron-withdrawing group includes an acyl group, an acyloxy group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, and a dialkylphosphono group. Group, diarylphosphono group, diarylphosphinyl group, alkylsulfinyl group, arylsulfinyl group, alkylsulfonyl group, arylsulfonyl group, sulfonyloxy group, acylthio group, sulfamoyl group, thiocyanate group, thiocarbonyl group, halogenated alkyl group , A halogenated alkoxy group, a halogenated aryloxy group, a halogenated alkylamino group, a halogenated alkylthio group, a heterocyclic group, a halogen atom, an azo group or a selenocyanate group, and X ₁ and X ₂ are the same Different Even if well,
Z ₁ and Z ₂ are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, substitution or unsubstituted aryl group, a substituted or unsubstituted Any of heterocyclic groups, Z ₁ and Z ₂ may be the same or different;
M is a hydrogen atom or lithium or potassium or sodium . The ink for inkjet recording according to claim 1, wherein the water-soluble organic solvent contains a polyhydric alcohol. The ink for inkjet recording according to claim 2, wherein the polyhydric alcohol is glycerin. The ink for inkjet recording according to claim 3, wherein the blending amount of the glycerin with respect to the total amount of the ink is 5 to 40% by weight. The ink for inkjet recording according to any one of claims 1 to 4, which is used as a yellow ink. The dye (1) is a compound represented by the following structural formula (1-A), a compound represented by the following structural formula (1-B), a compound represented by the following structural formula (1-C), The compound represented by the structural formula (1-D) and at least one compound selected from the group consisting of the compounds represented by the following structural formula (1-E) are included. The ink for inkjet recording as described.

An ink cartridge comprising an ink jet recording ink, wherein the ink is an ink jet recording ink according to any one of claims 1 to 6. An ink jet recording apparatus comprising an ink cartridge and an ink ejecting means, wherein ink for ink jet recording is ejected from the ink ejecting means, wherein the ink cartridge is the ink cartridge according to claim 7. apparatus.

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