JP4905434B2 - Water-based ink for ink jet recording, ink cartridge, and ink jet recording apparatus - Google Patents

Description

  The present invention relates to an aqueous inkjet recording ink, an ink cartridge, and an inkjet recording apparatus.

  Conventionally, as a water-based yellow ink for inkjet recording, C.I. I. Direct Yellow 86, C.I. I. Direct Yellow 132 and C.I. I. Inks containing direct yellow 173 and the like are widely used (see, for example, Patent Documents 1 to 5).

JP 2002-338853 A JP 2002-338854 A JP 2006-96995 A JP 2004-323587 A JP 2006-63329 A

  The ink is required to have excellent light resistance of recorded matter. Further, the ink is required not to deteriorate even during long-term storage and to have excellent storage stability. However, none of the conventional inks are excellent in both the light resistance and the storage stability of the recorded matter.

  Accordingly, an object of the present invention is to provide a water-based ink for ink-jet recording which has excellent light resistance of a recorded matter and excellent storage stability.

一般式（１−Ａ）において、Ｃ _４ Ｈ _９ （ｔ）は、ｔ−ブチル基を表す。 In order to achieve the above object, the water-based ink for ink-jet recording of the present invention is a water-based ink for ink-jet recording containing a colorant, water and a water-soluble organic solvent, and the colorant comprises the following dye (1) and see containing the dye (2), the weight ratio of the dye (1) and the dye (2) in the water-based ink, dye (1): dye (2) = 6: 4-9: that is 1 Features .
Dye (1): Dye represented by general formula (1-A)
Dye (2): C.I. I. Direct yellow 173

In the general formula (1-A), C ₄ H ₉ (t) represents a t-butyl group.

  Since the water-based ink for inkjet recording of the present invention uses the dye (1) and the dye (2) in combination, the recorded matter is excellent in light resistance and storage stability.

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

  In the water-based ink for inkjet recording of the present invention, the water-soluble organic solvent preferably contains a polyhydric alcohol.

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

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

  The ink cartridge of the present invention is an ink cartridge containing a water-based ink for inkjet recording, wherein the ink is the water-based 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 containing portion and an ink ejecting means, and ejects the ink contained in the ink containing portion by the ink ejecting means, and the ink containing portion is the present invention. Ink cartridges are included.

  Next, the water-based ink for inkjet recording of the present invention will be described. The water-based ink for inkjet recording of the present invention (hereinafter sometimes simply referred to as “ink” or “water-based ink”) 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 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 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 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-mentioned preferable group, and more various substituents are the above-mentioned preferable groups. More preferably, all substituents are most preferably the preferred groups described above.

  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, and more preferably secondary Or a tertiary alkyl group, and 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 -18 aryl group, substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms in total, more preferably a hydrogen atom, 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 structural formulas (1-A) to (1-E). In the structural formulas (1-A) to (1-E), C ₄ H ₉ (t) represents a t-butyl group.

  The blending amount of the dye (1) is not particularly limited. By including the dye (1) in the ink, the light resistance of the recorded matter using the ink can be improved. The blending amount of the dye (1) is, for example, 0.06 wt% to 6.3 wt%, preferably 0.12 wt% to 4.5 wt%, with respect to the total amount of the ink.

  As described above, the dye (2) is C.I. I. Direct yellow 173.

  The blending amount of the dye (2) is not particularly limited. Storage stability can be improved by including the dye (2) in the ink. The blending amount of the dye (2) is, for example, 0.01% to 2.8% by weight, and preferably 0.02% to 2.0% by weight with respect to the total amount of the ink.

Weight ratio of the dye (1) and the dye in the aqueous ink for inkjet recording of the present invention (2) the dye (1): Dye (2) = 6: 4 to 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 light resistance of a recorded matter using the ink and more excellent in storage stability. The water-based ink for ink-jet recording of the present invention exhibits a synergistic effect that exceeds the simple combination of the dye (1) and the dye (2). For example, the light resistance and the storage stability of the recorded matter are improved beyond an arithmetic average intermediate level between the dye (1) and the dye (2). Such synergistic effects of the present invention are demonstrated in the examples described below. The weight ratio is, if you focus the light resistance of recorded matter, dye (1): Dye (2) = 7: 3 to 9: long it is 1 to emphasize good preferred, storage stability if the dye (1): dye (2) = 6: 4 to 7: it is good preferable is 3. Since both the dye (1) and the dye (2) are excellent in the ozone resistance of the recorded matter, the water-based ink for ink jet recording of the present invention using them together has the light resistance and the storage stability of the recorded matter. In addition, the recorded material has excellent ozone resistance.

  The total blending amount of the dye (1) and the dye (2) is not particularly limited, but is preferably 0.1% by weight to 7% by weight with respect to the total amount of the ink. 2% to 5% by weight.

  The colorant may contain only the dye (1) and the dye (2), or may 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% by weight to 90% by weight, and preferably 40% by weight 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 ink from drying at the tip of the inkjet head and a penetrating agent that adjusts the drying speed on the recording medium.

  The wetting agent is not particularly limited. For example, lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol; dimethylformamide, dimethylacetamide Amides such as acetone; 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; 1,3-dimethyl-2-imidazolidinone and the like. The polyalkylene glycol is not particularly limited, and examples thereof include polyethylene glycol and polypropylene glycol. The alkylene glycol is not particularly 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. The wetting agent may be used alone or in combination of two or more.

  The blending amount (humectant ratio) of the wetting agent with respect to the total amount of the ink is not particularly limited, and is, for example, 0% by weight to 95% by weight, preferably 10% by weight to 80% by weight, and more preferably. 10% by weight 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 particularly limited, and examples thereof include glycol ethers. The glycol ether is not particularly limited, and for example, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol-n-propyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol-n-propyl ether, diethylene glycol-n- Butyl ether, diethylene glycol-n-hexyl ether, triethylene glycol methyl ether, triethylene glycol ethyl ether, triethylene glycol-n-propyl ether, triethylene glycol-n-butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol -N-propyl ether, propylene glycol n-butyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol-n-propyl ether, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether, tripropylene glycol ethyl ether, tripropylene glycol-n -Propyl ether, tripropylene glycol-n-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 (penetrating agent ratio) of the penetrant with respect to the total amount of the ink is not particularly limited, and is, for example, 0 wt% to 20 wt%. By setting the penetrant ratio within the above range, the penetrability of the water-based ink into a recording medium such as a recording paper can be further improved. The penetrant ratio is preferably 0.1% by weight to 15% by weight, and more preferably 0.5% by weight to 10% by weight.

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

  The water-based ink for inkjet recording of the present invention is, for example, a colorant, water and a water-soluble organic solvent, and optionally other additive components mixed uniformly by a conventionally known method, and insoluble in a filter or the like. Can be prepared by removing.

  The water-based ink for inkjet recording of the present invention can be used as, for example, a water-based yellow ink. The water-based ink for ink-jet recording of the present invention can be a water-based ink having a color other than yellow by further containing a colorant having a color other than yellow.

  Next, the ink cartridge of the present invention will be described. As described above, the ink cartridge of the present invention is a cartridge containing a water-based ink for ink-jet recording, and the ink is the water-based ink for ink-jet 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 is an ink jet recording apparatus that includes an ink containing portion and an ink ejecting means, and ejects the ink contained in the ink containing portion by the ink ejecting means, and the ink containing portion is the present invention. Ink cartridges are included. 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. In the ink jet recording apparatus of this example, the ink jet head 3 is the ink discharge means.

  The four ink cartridges 2 contain one color each of four colors of yellow, magenta, cyan, and black. The ink jet head 3 performs printing on a recording medium 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 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 medium P is fed from a paper feed cassette (not shown) provided on the side of or below the ink jet recording apparatus 1. The recording medium P is introduced between the inkjet head 3 and the platen roller 7. Then, predetermined printing is performed on the recording medium P by the ink ejected from the inkjet head 3. Thereafter, the recording medium P is discharged from the inkjet recording apparatus 1. In FIG. 1, the paper feed mechanism and paper discharge mechanism of the recording medium 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 3 is achieved. The sucked defective ink is stored in the ink reservoir 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.

  Next, examples of the present invention will be described together with comparative examples. In addition, this invention is not limited and restrict | limited by the following Example and comparative example.

[Examples 1 to 6 and Comparative Examples 1 and 2]
The ink composition components (Table 1) 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 to 6 and Comparative Example 1 were used. 2 water-based inks for inkjet recording were obtained. In Table 1, dyes (1-A) to (1-E) are compounds represented by structural formulas (1-A) to (1-E), respectively.

  For the water-based inks of Examples and Comparative Examples, (a) storage stability evaluation, (b) light resistance evaluation, and (c) comprehensive evaluation were performed by the following methods. In addition, the sample for (b) light resistance evaluation was prepared as follows.

That is, first, the ink cartridges were filled with the water-based inks of Examples and Comparative Examples. 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 an evaluation patch with 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) Storage stability evaluation Absorbance at a wavelength of 440 nm of a diluted solution obtained by diluting the aqueous inks of Examples and Comparative Examples with pure water 1600 times was measured using an ultraviolet-visible near-infrared spectrophotometer UV3600 manufactured by Shimadzu Corporation. And measured. A measurement cell having a cell length of 10 mm was used for measuring the absorbance. Subsequently, the water-based ink was separately put in a sealed container and stored in an environment at a temperature of 70 ° C. for 1 week. Next, the absorbance of a diluted solution obtained by diluting the water-based 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 better the storage stability.

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

Evaluation of storage stability Evaluation standard A: Absorbance decrease rate of less than 3% B: Absorbance decrease rate of 3% or more and less than 6% C: Absorbance decrease rate of 6% or more

(B) 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 150 hours. Subsequently, the OD value of the evaluation patch after the irradiation was measured in the same manner as described above. Next, an OD value reduction rate (%) was obtained by the following formula (II), and 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 (II)
X: 1.0 (initial OD value)
Y: OD value after irradiation

Light resistance evaluation Evaluation standard A: OD value reduction rate is less than 10% B: OD value reduction rate is 10% or more and less than 20% C: OD value reduction rate is 20% or more

(C) Comprehensive evaluation About the water-based ink of an Example and a comparative example, comprehensive evaluation was performed according to the following evaluation criteria from the result of said (a) and (b).

Comprehensive evaluation Evaluation criteria G: The evaluation results of the storage stability evaluation and the light resistance evaluation were A or B.
NG: C was found in any of the evaluation results of the storage stability evaluation and the light resistance evaluation.

  Table 1 shows the ink compositions and evaluation results of Examples and Comparative Examples. In Table 1, as the predicted value of the absorbance reduction rate in the storage stability evaluation and the OD value reduction rate in the light resistance evaluation, an arithmetic average intermediate level of the dye (1) and the dye (2) was calculated. Is.

  As shown in Table 1, the following findings were obtained from Examples and Comparative Examples.

  Example 1 (total dye content: 2.7% by weight): The weight ratio of the dye (1) and the dye (2) contains 90% of the dye (1), so that the results of light resistance evaluation are good. there were. The improvement in the OD value reduction rate in this light resistance evaluation was 2.4% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). 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 1.7% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

  Example 2 (total amount of dye: 2.7% by weight): The weight ratio of the dye (1) and the dye (2) contains 80% of the dye (1). there were. The improvement in the OD value reduction rate in this light resistance evaluation was 2.5% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). 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 this storage stability evaluation was 1.6% higher than the arithmetic average intermediate level (predicted value) of dye (1) and dye (2).

  Example 3 (total amount of dye: 2.7% by weight): The weight ratio of the dye (1) and the dye (2) contains 70% of the dye (1). there were. The improvement in the OD value reduction rate in this light resistance evaluation was 3.4% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). 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 1.8% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

  Example 4 (total dye content: 2.5% by weight): The weight ratio of the dye (1) and the dye (2) contains 70% of the dye (1), so that the results of light resistance evaluation are good. there were. The improvement in the OD value reduction rate in this light resistance evaluation was 5.1% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). 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 1.7% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

  Example 5 (total dye content: 3.5% by weight): The weight ratio of the dye (1) and the dye (2) contains 70% of the dye (1). there were. The improvement in the OD value reduction rate in this light resistance evaluation was 4.6% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). 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 absorbance decrease rate in the storage stability was 2.0% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2).

  Example 6 (total dye content: 2.7% by weight): The weight ratio of the dye (1) and the dye (2) contains 60% of the dye (1), so that the results of light resistance evaluation are good. there were. The improvement in the OD value reduction rate in this light resistance evaluation was 5.7% higher than the arithmetic average intermediate level (predicted value) between the dye (1) and the dye (2). Further, by containing 40% 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. The improvement in the rate of decrease in absorbance in the storage stability was 1.9% 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 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, the result of light resistance evaluation was inferior by not containing dye (1).

  As described above, the water-based ink for ink-jet recording of the present invention is excellent in the light resistance of the recorded matter and excellent in storage stability. The use of the water-based ink for inkjet recording of the present invention is not particularly limited, and can be widely applied to various types of inkjet recording.

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 (7)

A water-based ink for inkjet recording comprising a colorant, water and a water-soluble organic solvent,
The colorant is seen containing a dye (1) and the dye (2) below,
A water-based ink for ink-jet recording, wherein the weight ratio of the dye (1) and the dye (2) in the water-based ink is dye (1): dye (2) = 6: 4 to 9: 1 .
Dye (1): Dye represented by the general formula (1- A ) (2): C.I. I. Direct yellow 173

In General Formula (1- A ), C ₄ H ₉ (t) represents a t-butyl group. The water-based ink for inkjet recording according to claim 1, wherein the total blending amount of the dye (1) and the dye (2) is 0.1 wt% to 7 wt% with respect to the total amount of the ink. The water-based ink for inkjet recording according to claim 1, wherein the water-soluble organic solvent contains a polyhydric alcohol. The water-based ink for ink jet recording according to claim 3, wherein the polyhydric alcohol is glycerin. The water-based ink for inkjet recording according to claim 4, wherein the blending amount of the glycerin with respect to the total amount of the ink is 5% by weight to 40% by weight. An ink cartridge comprising a water-based ink for ink-jet recording, wherein the ink is the water-based ink for ink-jet recording according to any one of claims 1 to 5. An ink jet recording apparatus that includes an ink storage unit and an ink discharge unit, and discharges ink stored in the ink storage unit by the ink discharge unit, wherein the ink storage unit includes the ink cartridge according to claim 6. An ink jet recording apparatus.

Images