JP2006028325A - Ink composition, inkjet recording method and recorded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink composition in which the formation of a crystalline molecular complex is suppressed. <P>SOLUTION: The ink composition for inkjet recording, containing a dye and water is characterized by the absence of an ionic compound (except the dye) having 222-311 molecular weight and containing an alkyl group. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink composition that suppresses the precipitation of foreign matters in an ink flow path or the like.

  Inkjet recording is a method of recording characters and images (hereinafter sometimes simply referred to as “images”) on the surface of a recording medium by ejecting ink compositions as small droplets from fine nozzles. As an ink jet recording method, an electric signal is converted into a mechanical signal using an electrostrictive element, and an ink composition stored in a nozzle head portion is intermittently ejected to record characters and images on the surface of the recording medium. The ink composition stored in the nozzle head part is rapidly heated at a part close to the ejection part to generate bubbles, and ejected intermittently by volume expansion due to the bubbles, and characters and images are printed on the surface of the recording medium. A recording method has been put to practical use.

  In addition, as an ink composition for inkjet recording, in general, various dyes are dissolved in water or an organic solvent, or a mixed solution thereof from the viewpoint of safety and printing characteristics. More strict conditions are required as compared to ink compositions for writing instruments such as fountain pens and ballpoint pens.

  As one of the conditions, clean and stable ink can be supplied so that the ink can stably flow in the flow path, and printing defects such as print defects and print fading will not occur even if temperature changes or changes with time are applied. Can be mentioned.

However, when an elastomer resin containing a polyolefin resin is used for an ink contact member such as an ink collecting channel or a film for closing the ink, a crystalline molecular complex may be generated by contact with the ink. There was found. Since this crystalline molecular complex is brittle and breaks into a needle shape, it passes through a filter for trapping foreign matter and clogs the minute flow path of the nozzle head, causing abnormal discharge.
Accordingly, an object of the present invention is to provide an ink composition in which the formation of a crystalline molecular complex is suppressed.

  As a result of intensive studies in view of the above problems, the present inventors solved the above problems by limiting the amount of a specific component that is assumed to be involved in the formation of a crystalline molecular complex among the components of the ink composition. Based on this finding, the present inventors have reached the present invention.

  The ink composition for ink jet recording according to the present invention is an ink composition for ink jet recording comprising a dye and water, and contains an ionic compound having a molecular weight of 222 to 311 and containing an alkyl group (excluding a dye). It is characterized by not.

Furthermore, the ink composition for ink jet recording according to the present invention is characterized in that the ink jet recording method is a recording method using an ink jet head that forms ink droplets by mechanical deformation of an electrostrictive element.
Furthermore, the ink composition according to the present invention is characterized in that the ink jet recording method is an ink jet recording method using an ink jet printer having an ink contact member containing a compound represented by the following formula (1) in excess of 100 ppm. And

  Furthermore, the ink jet recording method according to the present invention is an ink jet recording method for performing recording by discharging a droplet of an ink composition and attaching the droplet to a recording medium, and the ink according to the present invention is used as the ink composition. It is characterized by using a composition.

  Furthermore, the recorded matter according to the present invention is recorded by the ink jet recording method according to the present invention.

The ink composition of the present invention is an ink composition comprising a dye in water or an aqueous medium composed of water and a water-soluble organic solvent. Further, the ink composition of the present invention may further contain a humectant, a viscosity adjuster, a pH adjuster and other additives. However, it is characterized by not containing an ionic compound (excluding a dye) having a molecular weight of 222 to 311 and containing an alkyl group. As such a compound, for example, a compound represented by the following formula (A) used as a solubilizer is produced by hydrolysis under acidic conditions.
R—O— (C ₂ H ₄ O) _i — (C ₃ H ₅ O) _j —H (A)
(In the formula, R represents an alkyl group or cycloalkyl group having 4 to 20 carbon atoms, i represents an integer of 6 to 18 and j represents an integer of 1 to 5).
As a result of analysis of the formed crystalline molecular complex by mass spectrum, the present inventors confirmed a peak in a specific range, and an ionic compound containing an alkyl group having a molecular weight of 222 to 311 (excluding a dye) This is because it was assumed that is involved in the formation of a crystalline molecular complex. The crystalline molecular complex is considered to be formed together with the ionic compound containing the alkyl group and a specific antioxidant that bleeds on the surface of the ink contact member (particularly the compound represented by the formula (1)). It is done.

Hereinafter, preferred compounds as the dye will be described, but the dye of the ink composition of the present invention is not limited thereto.
Preferable examples of the cyan dye include phthalocyanine compounds represented by the following general formula (I).

In the general formula (I), X ₁ , X ₂ , X ₃ and X ₄ each independently represent —SO—Z or —SO ₂ —Z, and —SO ₂ —Z is particularly preferable.

  Z is each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted group Or an unsubstituted heterocyclic group, particularly a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, and among them, a substituted alkyl group, a substituted aryl group, a substituted hetero group A cyclic group is preferred, a substituted alkyl group and a substituted aryl group are more preferred, and a substituted alkyl group is most preferred.

The substituted or unsubstituted alkyl group represented by Z is preferably an alkyl group having 1 to 30 carbon atoms. Examples of the substituent include the same substituents as those described later when Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ can further have a substituent.

The substituted or unsubstituted cycloalkyl group represented by Z is preferably a cycloalkyl group having 5 to 30 carbon atoms. Examples of the substituent include the same substituents as those described later when Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ can further have a substituent.

The substituted or unsubstituted alkenyl group represented by Z is preferably an alkenyl group having 2 to 30 carbon atoms. Examples of the substituent include the same substituents as those described later when Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ can further have a substituent.

The substituted or unsubstituted aralkyl group represented by Z is preferably an aralkyl group having 7 to 30 carbon atoms. Examples of the substituent include the same substituents as those described later when Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ can further have a substituent.

The substituted or unsubstituted aryl group represented by Z is preferably an aryl group having 6 to 30 carbon atoms. Examples of the substituent include the same substituents as those described later when Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ can further have a substituent.

The heterocyclic group represented by Z is preferably a 5-membered or 6-membered ring, which may be further condensed. Further, it may be an aromatic heterocycle or a non-aromatic heterocycle. In the following, the heterocyclic group represented by Z is exemplified in the form of a heterocyclic ring with the substitution position omitted, but the substitution position is not limited. For example, in the case of pyridine, the 2-position, 3-position, 4 It is possible to substitute at the position. Pyridine, pyrazine, pyrimidine, pyridazine, triazine, quinoline, isoquinoline, quinazoline, cinnoline, phthalazine, quinoxaline, pyrrole, indole, furan, benzofuran, thiophene, benzothiophene, pyrazole, imidazole, benzimidazole, triazole, oxazole, benzoxazole, thiazole Benzothiazole, isothiazole, benzisothiazole, thiadiazole, isoxazole, benzisoxazole, pyrrolidine, piperidine, piperazine, imidazolidine, thiazoline and the like. Among them, an aromatic heterocyclic group is preferable, and preferable examples thereof are exemplified in the same manner as described above. Examples include thiazole and thiadiazole.
These may have a substituent, and examples of the substituent are the same as those in the case where Z, Y ₁ , Y ₂ , Y ₃ and Y ₄ described later can further have a substituent. Things.

Y ₁ , Y ₂ , Y ₃ and Y ₄ are each independently a hydrogen atom, halogen atom, alkyl group, cycloalkyl group, alkenyl group, aralkyl group, aryl group, heterocyclic group, cyano group, hydroxy group, nitro Group, amino group, alkylamino group, alkoxy group, aryloxy group, amide group, arylamino group, ureido group, sulfamoylamino group, alkylthio group, arylthio group, alkoxycarbonylamino group, sulfonamido group, carbamoyl group, Alkoxycarbonyl group, heterocyclic oxy group, azo group, acyloxy group, carbamoyloxy group, silyloxy group, aryloxycarbonyl group, aryloxycarbonylamino group, imide group, heterocyclic thio group, phosphoryl group, acyl group, carboxyl group, Or a sulfo group, each of which May have a substituent.
Among these, a hydrogen atom, a halogen atom, an alkyl group, an aryl group, a cyano group, an alkoxy group, an amide group, a ureido group, a sulfonamido group, a carbamoyl group, an alkoxycarbonyl group, a carboxyl group, and a sulfo group are preferable, and in particular, a hydrogen atom, A halogen atom, a cyano group, a carboxyl group and a sulfo group are preferred, and a hydrogen atom is most preferred.

When Y ₁ , Y ₂ , Y ₃ , Y ₄ and Z are groups capable of further having a substituent, they may further have a substituent as listed below.

  Halogen atom (for example, chlorine atom, bromine atom); C1-C12 straight or branched alkyl group, C7-C18 aralkyl group, C2-C12 alkenyl group, C2-C12 A linear or branched alkynyl group, a cycloalkyl group having 3 to 12 carbon atoms which may have a side chain, a cycloalkenyl group having 3 to 12 carbon atoms which may have a side chain (specific examples of the above groups) Specific examples include, for example, methyl, ethyl, propyl, isopropyl, t-butyl, 2-methylsulfonylethyl, 3-phenoxypropyl, trifluoromethyl, cyclopentyl): aryl groups (eg, phenyl, 4-t-butylphenyl, 2 , 4-di-t-amylphenyl); heterocyclic groups (eg imidazolyl, pyrazolyl, triazolyl, 2-furyl, 2-thienyl, 2-pyrimidi) Alkoxy group (eg, methoxy, ethoxy, 2-methoxyethoxy, 2-methylsulfonylethoxy); aryloxy group (eg, phenoxy, 2-methylphenoxy, 4-t-butylphenoxy, 3- Nitrophenoxy, 3-t-butyloxycarbonylphenoxy, 3-methoxycarbonylphenoxy); acylamino groups (eg acetamide, benzamide, 4- (3-t-butyl-4-hydroxyphenoxy) butanamide); alkylamino groups (eg , Methylamino, butylamino, diethylamino, methylbutylamino); anilino group (eg, phenylamino, 2-chloroanilino); ureido group (eg, phenylureido, methylureido, N, N-dibutylureido); Moylamino group (for example, N, N-dipropylsulfamoylamino); alkylthio group (for example, methylthio, octylthio, 2-phenoxyethylthio); arylthio group (for example, phenylthio, 2-butoxy-5-t-octylphenylthio) , 2-carboxyphenylthio); alkyloxycarbonylamino group (for example, methoxycarbonylamino); sulfonamide group (for example, methanesulfonamide, benzenesulfonamide, p-toluenesulfonamide); carbamoyl group (for example, N-ethyl) Carbamoyl, N, N-dibutylcarbamoyl); sulfamoyl groups (eg, N-ethylsulfamoyl, N, N-dipropylsulfamoyl, N, N-diethylsulfamoyl); sulfonyl groups (eg, methylsulfonyl) , Octylsulfonyl, phenylsulfonyl, 4-methylphenylsulfonyl); alkyloxycarbonyl groups (for example, methoxycarbonyl, butyloxycarbonyl); heterocyclic oxy groups (for example, 1-phenyltetrazol-5-oxy, 2-tetrahydropyranyl) Oxy); azo group (for example, phenylazo, 4-methoxyphenylazo, 4-pivaloylaminophenylazo, 2-hydroxy-4-propanoylphenylazo); acyloxy group (for example, acetoxy); carbamoyloxy group (for example, , N-methylcarbamoyloxy, N-phenylcarbamoyloxy); silyloxy group (for example, trimethylsilyloxy, dibutylmethylsilyloxy); aryloxycarbonylamino group (for example, phenoxycarbonylamino) ); Imide group (for example, N-succinimide, N-phthalimide); heterocyclic thio group (for example, 2-benzothiazolylthio, 2,4-di-phenoxy-1,3,5-triazole-6-thio) , 2-pyridylthio); sulfinyl group (eg, 3-phenoxypropylsulfinyl); phosphonyl group (eg, phenoxyphosphonyl, octyloxyphosphonyl, phenylphosphonyl); aryloxycarbonyl group (eg, phenoxycarbonyl); acyl group (For example, acetyl, 3-phenylpropanoyl, benzoyl); ionic hydrophilic groups (for example, carboxyl group, sulfo group, quaternary ammonium group, sulfonylsulfamoyl group and acylsulfamoyl group); other cyano groups, Hydroxy group, nitro group, amino group etc. That. Among these substituents, a hydroxy group, an alkoxy group, a sulfamoyl group, a sulfonamide group, an acylamino group, a carbamoyl group, a cyano group, and an ionic hydrophilic group are preferable, and among them, a hydroxy group, a sulfamoyl group, and an ionic hydrophilic group are preferable. Particularly preferred.

_{A 1 ~a 4, b 1 ~b} 4 in formula (I), represent the number of substituents _{X 1 ~X 4, Y 1 ~Y} 4. A _{1 to} a ₄ are each independently an integer of 0 to 4, and b _{1 to} b ₄ are each independently an integer of 0 to 4. Here, when a _{1 to} a ₄ and b _{1 to} b ₄ are integers of 2 or more, the plurality of X _{1 to} X ₄ and Y _{1 to} Y ₄ may be the same or different.

a ₁ and b ₁ satisfy the relationship of a ₁ + b ₁ = 4 and each independently represents an integer of 0 to 4, particularly preferably a ₁ represents 1 or 2 and b ₁ represents 3 or 2 Among them, a combination in which a ₁ represents 1 and b ₁ represents 3 is most preferable.

a ₂ and b ₂ satisfy the relationship of a ₂ + b ₂ = 4 and each independently represents an integer of 0 to 4, particularly preferably a ₂ represents 1 or 2 and b ₂ represents 3 or 2 Among them, a combination in which a ₂ represents 1 and b ₂ represents 3 is the most preferable.

a ₃ and b ₃ satisfy the relationship of a ₃ + b ₃ = 4, each independently represents an integer of 0 to 4, and particularly preferably, a ₃ represents 1 or 2, and b ₃ represents 3 or 2 Among them, a combination in which a ₃ represents 1 and b ₃ represents ₃ is most preferable.

a ₄ and b ₄ satisfy the relationship of a ₄ + b ₄ = 4, each independently represents an integer of 0 to 4, and particularly preferably, a ₄ represents 1 or 2 and b ₄ represents 3 or 2 Among them, a combination in which a ₄ represents 1 and b ₄ represents 3 is most preferable.

  M represents a hydrogen atom, a metal element, a metal oxide, a metal hydroxide, or a metal halide.

In addition to hydrogen atoms, preferable as M are metal elements such as Li, Na, K, Mg, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Si, Ge, Sn, Pb, Sb, Bi and the like can be mentioned. Preferred oxides include VO and GeO. Preferred examples of the hydroxide include Si (OH) ₂ , Cr (OH) ₂ , Sn (OH) _{2 and the} like. Further, as the _{halides, AlCl, SiCl 2, VCl,} VCl 2, VOCl, FeCl, GaCl, ZrCl , and the like. Of these, Cu, Ni, Zn, Al and the like are preferable, and Cu is most preferable.

  Further, in the phthalocyanine compound represented by the general formula (I), Pc (phthalocyanine ring) is a dimer (for example, Pc-MLMMM-Pc) or 3 via L (a divalent linking group). A monomer may be formed, and a plurality of M present at that time may be the same or different.

The divalent linking group represented by L includes an oxy group —O—, a thio group —S—, a carbonyl group —CO—, a sulfonyl group —SO ₂ —, an imino group —NH—, a methylene group —CH ₂ —, And a group formed by combining them is preferred.

  In the above general formula (I), the molecular weight of the phthalocyanine compound is preferably in the range of 750 to 3000, more preferably in the range of 995 to 2500, of which the molecular weight is preferably 995 to 2000, and particularly the molecular weight in the range of 995 to 1800. Is most preferred.

  The phthalocyanine compound represented by the general formula (I) is dimer (for example, Pc-MLMMPc) or trimer with Pc (phthalocyanine ring) via L (divalent linking group). The preferred molecular weight, for example, the particularly preferred molecular weight is 2 times (in the case of a dimer) or 3 times (in the case of a trimer) the particularly preferred molecular weight (in the range of 995 to 1800) described above. is there. Here, the preferable molecular weight of the dimer or trimer is a value including the linking group L.

In the phthalocyanine compound represented by the general formula (I), is at least one of X ₁ , X ₂ , X ₃ , X ₄ , Y ₁ , Y ₂ , Y ₃ and Y ₄ an ionic hydrophilic group? Or it is a group having an ionic hydrophilic group as a substituent.

The ionic hydrophilic group as a substituent, a sulfo group (-SO ₃ ^- X ^+), a carboxyl group (-CO ₂ ^- X ^+), and quaternary ammonium group (-N ⁺ RR'R "X ^-) , acylsulfamoyl groups ^{_{(-SO 2 N + X - COR}} ), a sulfonylcarbamoyl group _{^{(-CON + X - SO 2 R}} ), sulfonylsulfamoyl groups ^{_{(-SO 2 N + X - SO}} 2 R) or the like A sulfo group, a carboxyl group, and a quaternary ammonium group are preferable, and a sulfo group is particularly preferable, and the sulfo group, the carboxyl group, the acylsulfamoyl group, the sulfonylcarbamoyl group, and the sulfonylsulfamoyl group are in a salt state. Examples of counter ions that form salts include alkali metal ions (eg, sodium ions, potassium ions, lithium ions), ammonium ions, Organic cations (eg, tetramethylguanidinium ion), organic and / or inorganic anions (eg, halogen ion, methanesulfonate ion, benzenesulfonate ion), where X in parentheses is a hydrogen atom or Counter ions, R, R ′, and R ″ represent substituents.

  Since the phthalocyanine compound represented by the general formula (I) has at least one ionic hydrophilic group or a group having an ionic hydrophilic group as a substituent in one molecule, it is soluble in an aqueous medium. Or dispersibility becomes favorable. From such a viewpoint, as the phthalocyanine compound represented by the general formula (I), those having at least two ionic hydrophilic groups in one molecule are preferable, and at least one of a plurality of ionic hydrophilic groups is used. Is more preferably a sulfo group, and most preferably one having at least two sulfo groups in one molecule.

  Particularly preferred compounds as the phthalocyanine compound represented by the general formula (I) are compounds having the following combinations (a) to (f).

(A) Regarding X _{1 to} X ₄ , these are each independently preferably —SO ₂ —Z.
(B) With respect to Z, these are each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, and among them, a substituted alkyl group and a substituted aryl group , Substituted heterocyclic groups are preferred, and substituted alkyl groups are most preferred.
(C) Regarding Y _{1 to} Y ₄ , these are each independently a hydrogen atom, a halogen atom, an alkyl group, an aryl group, a cyano group, an alkoxy group, an amide group, a ureido group, a sulfonamide group, a carbamoyl group, and a sulfamoyl group. Group, alkoxycarbonyl group, carboxyl group, and sulfo group are preferable, hydrogen atom, halogen atom, cyano group, carboxyl group, and sulfo group are particularly preferable, and hydrogen atom is most preferable.
(D) a _{1 to} a ₄ are each independently preferably 1 or 2, and particularly preferably 1. b _{1 to} b ₄ are each independently preferably 3 or 2, and particularly preferably 3.
(E) M is preferably Cu, Ni, Zn, or Al, and most preferably Cu.
(F) The molecular weight of the phthalocyanine compound is preferably in the range of 750 to 3000, more preferably in the range of 995 to 2500, of which the molecular weight in the range of 995 to 2000 is preferable, and the molecular weight in the range of 995 to 1800 is most preferable. preferable.

  As for the preferred combination of substituents of the compound represented by the general formula (I), a compound in which at least one of various substituents is the preferred group is preferred, and more various substituents are preferred groups. Certain compounds are more preferred, and compounds in which all substituents are the preferred groups are most preferred.

  Among the phthalocyanine compounds represented by the general formula (I), a phthalocyanine compound having a structure represented by the following general formula (III) is more preferable. The phthalocyanine compound represented by the general formula (III) used in the present invention is described in detail below.

In Formula _{(III), X 21, X} 22, X 23 and X ₂₄ each independently represent any of -SO-Z and -SO ₂ -Z, in particular -SO ₂ -Z is preferable.
Z is synonymous with Z in formula (I), and preferred examples are also the same.

Y _{21 to} Y ₂₈ are each independently synonymous with Y ₁ , Y ₂ , Y ₃ and Y ₄ in the general formula (I), and preferred examples are also the same.
a _{21 to} a ₂₄ satisfy 4 ≦ a ₂₁ + a ₂₂ + a ₂₃ + a ₂₄ ≦ 8, preferably 4 ≦ a ₂₁ + a ₂₂ + a ₂₃ + a ₂₄ ≦ 6, and each independently represents an integer of 1 or 2. Particularly preferred is the case where a ₂₁ = a ₂₂ = a ₂₃ = a ₂₄ = 1.

M has the same meaning as M in formula (I).
At least one of X ₂₁ , X ₂₂ , X ₂₃ , X ₂₄ , Y ₂₁ , Y ₂₂ , Y ₂₃ , Y ₂₄ , Y ₂₅ , Y ₂₆ , Y ₂₇ and Y ₂₈ is an ionic hydrophilic group or ionic hydrophilic Group having a functional group as a substituent.
Examples of the ionic hydrophilic group are the same as examples of _{X 1, X 2, X 3} , X 4 in the general formula (I), and preferred examples thereof are also the same.

  Since the phthalocyanine compound represented by the general formula (III) has at least one ionic hydrophilic group or a group having an ionic hydrophilic group as a substituent in one molecule, it is soluble in an aqueous medium. Or dispersibility becomes favorable. From such a viewpoint, the phthalocyanine compound represented by the general formula (III) preferably has at least two ionic hydrophilic groups in one molecule, and at least one of a plurality of ionic hydrophilic groups has Those having a sulfo group are more preferable, and those having at least two sulfo groups in one molecule are most preferable.

In the general formula (III), the molecular weight of the phthalocyanine compound is preferably in the range of 750 to 3000, more preferably in the range of 995 to 2500, of which the molecular weight is preferably 995 to 2000, and particularly the molecular weight in the range of 995 to 1800. Is most preferred.
However, the phthalocyanine compound represented by the general formula (III) in the present invention is a dimer (for example, Pc-MLMLM-Pc) of Pc (phthalocyanine ring) via L (divalent linking group). ) Or a trimer, a preferable molecular weight, for example, a particularly preferable molecular weight is 2 times (in the case of a dimer) or 3 times (3 amounts) of the particularly preferable molecular weight described above (in the range of 995 to 1800). Body). Here, the preferable molecular weight of the dimer or trimer is a value including the linking group L.

  Particularly preferred compounds as the phthalocyanine compound represented by the general formula (III) are compounds having the following combinations (a) to (f).

(A) X _{21 to} X ₂₄ are each independently preferably —SO ₂ —Z.
(B) Z is preferably independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, and among them, a substituted alkyl group, a substituted aryl group, a substituted hetero group A cyclic group is preferred, and a substituted alkyl group is most preferred.
(C) For Y _{21 to} Y ₂₈ , each independently represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, a cyano group, an alkoxy group, an amide group, a ureido group, a sulfonamide group, a carbamoyl group, a sulfamoyl group, an alkoxy group. A carbonyl group, a carboxyl group, and a sulfo group are preferable, a hydrogen atom, a halogen atom, a cyano group, a carboxyl group, and a sulfo group are particularly preferable, and a hydrogen atom is most preferable.
(D) a _{11 to} a ₁₄ are preferably each independently 1 or 2, and particularly preferably a ₁₁ = a ₁₂ = a ₁₃ = a ₁₄ = 1.
(E) M is preferably Cu, Ni, Zn, or Al, and most preferably Cu.
(F) The molecular weight of the phthalocyanine compound is preferably in the range of 750 to 2500, more preferably in the range of 995 to 2500, of which the molecular weight in the range of 995 to 2000 is preferred, and the molecular weight in the range of 995 to 1800 is most preferred. preferable.

  As for the preferred combination of substituents of the compound represented by the general formula (III), a compound in which at least one of various substituents is the preferred group is preferred, and more various substituents are preferred groups. Certain compounds are more preferred, and compounds in which all substituents are the preferred groups are most preferred.

  Among the phthalocyanine compounds represented by the general formula (III), a phthalocyanine compound having a structure represented by the following general formula (IV) is more preferable. The phthalocyanine compound represented by the general formula (IV) used in the present invention is described in detail below.

Z ₁ , Z ₂ , Z ₃ and Z _{4 in the} general formula (IV) are each independently synonymous with Z in the general formula (I), and preferred examples are also the same.

q ₁ , q ₂ , q ₃ , and q ₄ each independently represents an integer of 1 or 2, and is particularly preferably 2. Among them, q ₁ = q ₂ = q ₃ = q ₄ = 2 Most preferred.
a ₃₁ , a ₃₂ , a ₃₃ , and a ₃₄ each independently represents an integer of 1 or 2, and is particularly preferably 1. Among them, a ₃₁ = a ₃₂ = a ₃₃ = a ₃₄ = 1 Most preferred.

M has the same meaning as M in the general formula (I).
At least one of Z ₁ , Z ₂ , Z ₃ and Z ₄ has an ionic hydrophilic group as a substituent.
The example of an ionic hydrophilic group is synonymous with the example of Z in the said general formula (I), and its preferable example is also the same.
The molecular weight of the phthalocyanine compound is preferably in the range of 750 to 2500, more preferably in the range of 995 to 2500, of which the molecular weight in the range of 995 to 2000 is preferable, and the molecular weight in the range of 995 to 1800 is most preferable.

  Among the compounds represented by the general formula (I) used in the present invention, the compounds represented by the following general formula (II) are particularly preferable.

式中、Ｍは一般式（Ｉ）におけると同義であり、Ｒ₁〜Ｒ₄はそれぞれ独立に−ＳＯ₂Ｚを表す。Ｚは一般式（Ｉ）におけるＺと同義であり、好ましい例も同じである。但し、４つのＺのうち少なくとも１つはイオン性親水性基を置換基として有する。

In the formula, M has the same meaning as in general formula (I), and R _{1 to} R ₄ each independently represent —SO ₂ Z. Z is synonymous with Z in formula (I), and preferred examples are also the same. However, at least one of the four Z has an ionic hydrophilic group as a substituent.

  Of the above-mentioned compounds, a compound in which M in the general formula (II) is a copper element, Z having a ionic hydrophilic group as a substituent and a sulfoalkyl group is more preferable, and the sulfo group is in a salt state. A compound in which the counter cation forming the salt is a lithium cation is preferable.

Examples of the phthalocyanine compound represented by the following general formula (V) that can be used in the present invention include a phthalonitrile compound represented by the following general formula (VI) and / or a diimino represented by the following general formula (VII). It is synthesized by reacting an isoindoline derivative with a metal derivative represented by M- (Y) d. In the formula, Z and Z _{1 to} Z ₄ have the same meaning as Z in formula (I), and M has the same meaning as M in formula (I). Y represents a monovalent or divalent ligand such as a halogen atom, acetate anion, acetylacetonate, or oxygen, and d is an integer of 1 to 4. Examples of the metal derivative represented by M- (Y) d include Al, Si, Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Ge, Ru, Rh, Pd, In, Sn, Pt, and Pb. Halides, carboxylic acid derivatives, sulfates, nitrates, carbonyl compounds, oxides, complexes and the like can be mentioned. Specific examples include copper chloride, copper bromide, copper iodide, nickel chloride, nickel bromide, nickel acetate, cobalt chloride, cobalt bromide, cobalt acetate, iron chloride, zinc chloride, zinc bromide, zinc iodide, acetic acid. Examples include zinc, vanadium chloride, vanadium oxytrichloride, palladium chloride, palladium acetate, aluminum chloride, manganese chloride, manganese acetate, acetylacetone manganese, manganese chloride, lead chloride, lead acetate, indium chloride, titanium chloride, tin chloride and the like.

The compound represented by the general formula (V) thus obtained is usually R ₁ (SO ₂ -Z ₁ ), R ₂ (SO ₂ -Z ₂ ), R ₃ (SO ₂ -Z ₃ ), It is a mixture of compounds represented by the following general formulas (a) -1 to (a) -4, which are isomers at each substitution position of R ₄ (SO ₂ —Z ₄ ).
Furthermore, when preparing a dye using two or more types of general formula (VI) and / or general formula (VII) having different substituents, the compound represented by general formula (V) is the type of substituent. , The dye mixture in different positions.

  Examples of cyan dyes used in the present invention include compounds having the corresponding structures described in JP-A Nos. 2002-249677, 2003-213167, 2003-213168, and 2004-2670. Particularly preferred are those listed in the table below. About the compound of Table 1, Table 2, it is compoundable by the method as described in the said gazette or specification. Of course, the starting compound, the dye intermediate and the synthesis method are not limited to these.

As the magenta dye, a compound represented by the following general formula (VI) can be preferably used.
Formula (VI)

In formula (VI), A represents a residue of a 5-membered heterocyclic diazo component A-NH _2. Examples of hetero atoms of the 5-membered heterocyclic ring include N, O, and S. Preferably, it is a nitrogen-containing 5-membered heterocyclic ring, and the heterocyclic ring may be condensed with an aliphatic ring, an aromatic ring or another heterocyclic ring. Examples of preferred heterocyclic rings for A include pyrazole ring, imidazole ring, thiazole ring, isothiazole ring, thiadiazole ring, benzothiazole ring, benzoxazole ring, and benzoisothiazole ring. Each heterocyclic group may further have a substituent. Of these, pyrazole rings, imidazole rings, isothiazole rings, thiadiazole rings, and benzothiazole rings represented by the following general formulas (a) to (f) are preferable.

R ⁷ to R ²⁰ in the general formula (a) ~ (f) represents a substituent G, the same substituents as R ^1, R ² to be described later. Of the above general formulas (a) to (f), preferred are the pyrazole ring and isothiazole ring represented by the general formulas (a) and (b), and the most preferred is represented by the general formula (a). Pyrazole ring.
B ¹ and B ² each represent -CR ¹ =, -CR ² =, or either one represents a nitrogen atom and the other represents -CR ¹ = or -CR ² =, but each represents -CR ¹ =, represents a -CR ² = is more preferable.
R ⁵ and R ⁶ are each independently a hydrogen atom, aliphatic group, aromatic group, heterocyclic group, acyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, alkyl and arylsulfonyl group, or sulfamoyl group. Each group may further have a substituent. Preferable substituents represented by R ⁵ and R ⁶ include a hydrogen atom, aliphatic group, aromatic group, heterocyclic group, acyl group, alkyl and arylsulfonyl group. More preferably, they are a hydrogen atom, an aromatic group, a heterocyclic group, an acyl group, an alkyl or arylsulfonyl group. Most preferably, they are a hydrogen atom, an aryl group, and a heterocyclic group. Each group may further have a substituent. However, R ⁵ and R ⁶ are not simultaneously hydrogen atoms.

G, R ¹ and R ² are each independently a hydrogen atom, halogen atom, aliphatic group, aromatic group, heterocyclic group, cyano group, carboxyl group, carbamoyl group, alkoxycarbonyl group, aryloxycarbonyl group, Substituted with acyl group, hydroxy group, alkoxy group, aryloxy group, silyloxy group, acyloxy group, carbamoyloxy group, heterocyclic oxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, alkyl group or aryl group or heterocyclic group Amino group, acylamino group, ureido group, sulfamoylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, alkyl and arylsulfonylamino group, nitro group, alkyl and arylthio group, heterocyclic thio group, alkyl and Ant Rusuruhoniru group, alkylsulfinyl group, arylsulfinyl group, a sulfamoyl group or a sulfo group, and each group may be further substituted.

  Preferred substituents represented by G include a hydrogen atom, a halogen atom, an aliphatic group, an aromatic group, a hydroxy group, an alkoxy group, an aryloxy group, an acyloxy group, a heterocyclic oxy group, an alkyl group, an aryl group, or a heterocyclic group. Examples thereof include an amino group substituted with a cyclic group, an acylamino group, a ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkyl and arylthio group, and a heterocyclic thio group, more preferably a hydrogen atom. Atom, halogen atom, alkyl group, hydroxy group, alkoxy group, aryloxy group, acyloxy group, amino group substituted by alkyl group, aryl group or heterocyclic group, or acylamino group, among which hydrogen atom, arylamino Most preferred is an amide group. Each group may further have a substituent.

Preferable substituents represented by R ¹ and R ² include a hydrogen atom, an alkyl group, an alkoxycarbonyl group, a carboxyl group, a carbamoyl group, and a cyano group. Each group may further have a substituent. R ¹ and R ⁵ or R ⁵ and R ⁶ may combine to form a 5- to 6-membered ring. Examples of the substituent in the case where each of the substituents represented by A, R ¹ , R ² , R ⁵ , R ⁶ , and G further has a substituent include the substituents exemplified for G, R ¹ , and R ² above. be able to.

When the azo dye represented by the general formula (VI) is a water-soluble dye, ionic hydrophilicity as a substituent at any position on A, R ¹ , R ² , R ⁵ , R ⁶ and G It is preferable to further have a group. Examples of the ionic hydrophilic group as a substituent include a sulfo group, a carboxyl group, and a quaternary ammonium group. As the ionic hydrophilic group, a carboxyl group and a sulfo group are preferable, and a sulfo group is particularly preferable. The carboxyl group and the sulfo group may be in a salt state, and examples of the counter ion forming the salt include alkali metal ions (eg, sodium ion, potassium ion, lithium ion), ammonium ions and organic cations (eg, Tetramethylammonium and tetramethylguanidinium ions).

Hereinafter, the substituents represented by G, R ¹ and R ² will be described in detail.
Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.

  In general formula (VI), an aliphatic group means an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an alkynyl group, a substituted alkynyl group, an aralkyl group, and a substituted aralkyl group. The aliphatic group may have a branch and may form a ring. The number of carbon atoms in the aliphatic group is preferably 1-20, and more preferably 1-16. The aryl part of the aralkyl group and the substituted aralkyl group is preferably phenyl or naphthyl, particularly preferably phenyl. Examples of aliphatic groups include methyl, ethyl, butyl, isopropyl, t-butyl, hydroxyethyl, methoxyethyl, cyanoethyl, trifluoromethyl, 3-sulfopropyl, 4-sulfobutyl, cyclohexyl group, benzyl group, 2-phenethyl Groups, vinyl groups, and allyl groups.

  In the general formula (VI), the aromatic group means an aryl group and a substituted aryl group. The aryl group is preferably phenyl or naphthyl, particularly preferably phenyl. The number of carbon atoms in the aromatic group is preferably 6-20, and more preferably 6-16. Examples of the aromatic group include phenyl, p-tolyl, p-methoxyphenyl, o-chlorophenyl and m- (3-sulfopropylamino) phenyl. The heterocyclic group includes a heterocyclic group having a substituent and an unsubstituted heterocyclic group. The heterocyclic ring may be condensed with an aliphatic ring, an aromatic ring or another heterocyclic ring. The heterocyclic group is preferably a 5-membered or 6-membered heterocyclic group. Examples of the substituent include aliphatic groups, halogen atoms, alkyl and arylsulfonyl groups, acyl groups, acylamino groups, sulfamoyl groups, carbamoyl groups, ionic hydrophilic groups and the like. Examples of the heterocyclic group include 2-pyridyl group, 2-thienyl group, 2-thiazolyl group, 2-benzothiazolyl group, 2-benzoxazolyl group and 2-furyl group.

  The carbamoyl group includes a carbamoyl group having a substituent and an unsubstituted carbamoyl group. Examples of the substituent include an alkyl group. Examples of the carbamoyl group include a methylcarbamoyl group and a dimethylcarbamoyl group.

  The alkoxycarbonyl group includes an alkoxycarbonyl group having a substituent and an unsubstituted alkoxycarbonyl group. As the alkoxycarbonyl group, an alkoxycarbonyl group having 2 to 12 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the alkoxycarbonyl group include a methoxycarbonyl group and an ethoxycarbonyl group.

  The aryloxycarbonyl group includes an aryloxycarbonyl group having a substituent and an unsubstituted aryloxycarbonyl group. As the aryloxycarbonyl group, an aryloxycarbonyl group having 7 to 12 carbon atoms is preferable. Substituents include ionic hydrophilic groups. Examples of the aryloxycarbonyl group include a phenoxycarbonyl group.

  The acyl group includes an acyl group having a substituent and an unsubstituted acyl group. As the acyl group, an acyl group having 1 to 12 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the acyl group include an acetyl group and a benzoyl group.

  The alkoxy group includes an alkoxy group having a substituent and an unsubstituted alkoxy group. As the alkoxy group, an alkoxy group having 1 to 12 carbon atoms is preferable. Examples of the substituent include an alkoxy group, a hydroxy group, and an ionic hydrophilic group. Examples of the alkoxy group include a methoxy group, an ethoxy group, an isopropoxy group, a methoxyethoxy group, a hydroxyethoxy group, and a 3-carboxypropoxy group.

  The aryloxy group includes an aryloxy group having a substituent and an unsubstituted aryloxy group. As the aryloxy group, an aryloxy group having 6 to 12 carbon atoms is preferable. Examples of the substituent include an alkoxy group and an ionic hydrophilic group. Examples of the aryloxy group include a phenoxy group, a p-methoxyphenoxy group, and an o-methoxyphenoxy group.

  The acyloxy group includes an acyloxy group having a substituent and an unsubstituted acyloxy group. As the acyloxy group, an acyloxy group having 1 to 12 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the acyloxy group include an acetoxy group and a benzoyloxy group.

  The carbamoyloxy group includes a carbamoyloxy group having a substituent and an unsubstituted carbamoyloxy group. Examples of the substituent include an alkyl group. Examples of the carbamoyloxy group include an N-methylcarbamoyloxy group.

  The substituent of the amino group substituted with an alkyl group, an aryl group or a heterocyclic group may further have a substituent. Unsubstituted amino groups are not included. As the alkylamino group, an alkylamino group having 1 to 6 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the alkylamino group include a methylamino group and a diethylamino group. The arylamino group includes an arylamino group having a substituent and an unsubstituted arylamino group. The arylamino group is preferably an arylamino group having 6 to 12 carbon atoms. Examples of the substituent include a halogen atom and an ionic hydrophilic group. Examples of the arylamino group include an anilino group and a 2-chloroanilino group.

  The acylamino group includes an acylamino group having a substituent. The acylamino group is preferably an acylamino group having 2 to 12 carbon atoms. Examples of the substituent include an ionic hydrophilic group. Examples of the acylamino group include an acetylamino group, a propionylamino group, a benzoylamino group, an N-phenylacetylamino group, and a 3,5-disulfobenzoylamino group.

  The ureido group includes a ureido group having a substituent and an unsubstituted ureido group. The ureido group is preferably a ureido group having 1 to 12 carbon atoms. Examples of the substituent include an alkyl group and an aryl group. Examples of the ureido group include a 3-methylureido group, a 3,3-dimethylureido group, and a 3-phenylureido group.

  The sulfamoylamino group includes a sulfamoylamino group having a substituent and an unsubstituted sulfamoylamino group. Examples of the substituent include an alkyl group. Examples of the sulfamoylamino group include N, N-dipropylsulfamoylamino.

  The alkoxycarbonylamino group includes an alkoxycarbonylamino group having a substituent and an unsubstituted alkoxycarbonylamino group. As the alkoxycarbonylamino group, an alkoxycarbonylamino group having 2 to 12 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the alkoxycarbonylamino group include an ethoxycarbonylamino group.

  The aryloxycarbonylamino group includes an aryloxycarbonylamino group having a substituent and an unsubstituted aryloxycarbonylamino group. The aryloxycarbonylamino group is preferably an aryloxycarbonylamino group having 7 to 12 carbon atoms. Examples of the substituent include an ionic hydrophilic group. Examples of the aryloxycarbonylamino group include a phenoxycarbonylamino group.

  The alkyl and arylsulfonylamino groups include substituted alkyl and arylsulfonylamino groups, and unsubstituted alkyl and arylsulfonylamino groups. As the sulfonylamino group, a sulfonylamino group having 1 to 12 carbon atoms is preferable. Examples of the substituent include an ionic hydrophilic group. Examples of the sulfonylamino group include a methanesulfonylamino group, an N-phenylmethanesulfonylamino group, a benzenesulfonylamino group, and a 3-carboxybenzenesulfonylamino group.

  The alkyl, aryl and heterocyclic thio groups include substituted alkyl, aryl and heterocyclic thio groups and unsubstituted alkyl, aryl and heterocyclic thio groups. As the alkyl, aryl and heterocyclic thio groups, those having 1 to 12 carbon atoms are preferred. Examples of the substituent include an ionic hydrophilic group. Examples of the alkyl, aryl and heterocyclic thio groups include a methylthio group, a phenylthio group, and a 2-pyridylthio group.

  Examples of the alkyl and arylsulfonyl groups include a methanesulfonyl group and a phenylsulfonyl group, respectively. Examples of the alkyl and arylsulfinyl groups include a methanesulfinyl group and a phenylsulfinyl group, respectively.

  The sulfamoyl group includes a sulfamoyl group having a substituent and an unsubstituted sulfamoyl group. Examples of the substituent include an alkyl group. Examples of the sulfamoyl group include a dimethylsulfamoyl group and a di- (2-hydroxyethyl) sulfamoyl group.

  In the present invention, particularly preferred azo dyes are those represented by the following general formula (VII).

Formula (VII)

In the formula, Z ¹ represents an electron-withdrawing group having a Hammett's substituent constant σp value of 0.20 or more. Z ¹ is preferably an electron-withdrawing group having a σp value of 0.30 to 1.0. Examples of preferable specific substituents include the electron-withdrawing substituents described later, and among them, an acyl group having 2 to 12 carbon atoms, an alkyloxycarbonyl group having 2 to 12 carbon atoms, a nitro group, and a cyano group. , An alkylsulfonyl group having 1 to 12 carbon atoms, an arylsulfonyl group having 6 to 18 carbon atoms, a carbamoyl group having 1 to 12 carbon atoms, and a halogenated alkyl group having 1 to 12 carbon atoms are preferable. Particularly preferred are a cyano group, an alkylsulfonyl group having 1 to 12 carbon atoms, and an arylsulfonyl group having 6 to 18 carbon atoms, and most preferred is a cyano group.

R ¹ , R ² , R ⁵ and R ⁶ have the same meaning as in the general formula (VI). R ³ and R ⁴ are each independently a hydrogen atom, aliphatic group, aromatic group, heterocyclic group, acyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, alkyl and arylsulfonyl group, or sulfamoyl group. Represents. Of these, a hydrogen atom, aromatic group, heterocyclic group, acyl group, alkyl and arylsulfonyl group are preferable, and a hydrogen atom, aromatic group and heterocyclic group are particularly preferable. Z ² represents a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group.

  Q represents a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group. Among these, Q is preferably a group composed of a nonmetallic atom group necessary for forming a 5- to 8-membered ring. This 5- to 8-membered ring may be substituted, may be a saturated ring, or may have an unsaturated bond. Of these, aromatic groups and heterocyclic groups are particularly preferable. Preferred nonmetallic atoms include nitrogen atoms, oxygen atoms, sulfur atoms and carbon atoms. Specific examples of the 5- to 8-membered ring include, for example, a benzene ring, a cyclopentane ring, a cyclohexane ring, a cycloheptane ring, a cyclooctane ring, a cyclohexene ring, a pyridine ring, a pyrimidine ring, a pyrazine ring, a pyridazine ring, a triazine ring, and an imidazole ring. , Benzimidazole ring, oxazole ring, benzoxazole ring, thiazole ring, benzothiazole ring, oxane ring, sulfolane ring and thiane ring.

Each group described in formula (VII) may further have a substituent. When each of these groups further has a substituent, examples of the substituent include the substituents described in the general formula (VI), the groups exemplified for G, R ¹ and R ² , and ionic hydrophilic groups.

Here, Hammett's substituent constant σp value used in the present specification will be described in relation to the substituent Z ¹ . Hammett's rule is an empirical rule proposed by LP Hammett in 1935 to quantitatively discuss the effect of substituents on the reaction or equilibrium of benzene derivatives, which is widely accepted today. Substituent constants determined by Hammett's rule include σp value and σm value, and these values can be found in many general books. For example, JA Dean edition, “Lange's Handbook of Chemistry” 12th edition, 1979 (McGraw-Hill), “Chemical domain” special edition, 122, 96-103, 1979 (Nankodo). In the present invention, each substituent is limited or explained by Hammett's substituent constant σp, which means that it can be found in the above-mentioned book and is limited only to a substituent having a known value in the literature. However, it goes without saying that even if the value is unknown, it also includes a substituent that would be included in the range when measured based on Hammett's rule. The general formulas (VI) and (VII) of the present invention include those that are not benzene derivatives, but the σp value is used as a measure of the electronic effect of the substituent regardless of the substitution position. In the present invention, the σp value is used in this sense.

  Examples of the electron-withdrawing group having a Hammett substituent constant σp value of 0.60 or more include a cyano group, a nitro group, and an alkylsulfonyl group (for example, a methanesulfonyl group and an arylsulfonyl group (for example, a benzenesulfonyl group)). As the electron withdrawing group having a Hammett σp value of 0.45 or more, in addition to the above, an acyl group (for example, acetyl group), an alkoxycarbonyl group (for example, dodecyloxycarbonyl group), an aryloxycarbonyl group (for example, m-chlorophenoxy) Carbonyl), alkylsulfinyl group (for example, n-propylsulfinyl), arylsulfinyl group (for example, phenylsulfinyl), sulfamoyl group (for example, N-ethylsulfamoyl, N, N-dimethylsulfamoyl), halogenated alkyl group (For example, a trif Romechiru) can be mentioned.

  As the electron-withdrawing group having a Hammett substituent constant σp value of 0.30 or more, in addition to the above, an acyloxy group (for example, acetoxy), a carbamoyl group (for example, N-ethylcarbamoyl, N, N-dibutylcarbamoyl), halogen Alkoxy group (for example, trifluoromethyloxy), halogenated aryloxy group (for example, pentafluorophenyloxy), sulfonyloxy group (for example, methylsulfonyloxy group), halogenated alkylthio group (for example, difluoromethylthio), 2 An aryl group (eg, 2,4-dinitrophenyl, pentachlorophenyl) substituted with one or more electron-withdrawing groups having a σp value of 0.15 or more, and a heterocyclic ring (eg, 2-benzoxazolyl, 2- Benzothiazolyl, 1-phenyl-2-benzimidazolyl) You can. Specific examples of the electron-withdrawing group having a σp value of 0.20 or more include a halogen atom in addition to the above.

Particularly preferred combinations of substituents as the azo dye represented by the general formula (VI) are as follows.
(A) R ⁵ and R ⁶ are preferably a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a sulfonyl group, or an acyl group, and more preferably a hydrogen atom, an aryl group, a heterocyclic group, or a sulfonyl group. And most preferably a hydrogen atom, an aryl group, or a heterocyclic group. However, R ⁵ and R ⁶ are not both hydrogen atoms.
(B) G is preferably a hydrogen atom, a halogen atom, an alkyl group, a hydroxy group, an amino group or an amide group, more preferably a hydrogen atom, a halogen atom, an amino group or an amide group, most preferably a hydrogen atom. An amino group or an amide group.
(C) A is preferably a pyrazole ring, an imidazole ring, an isothiazole ring, a thiadiazole ring, or a benzothiazole ring, more preferably a pyrazole ring or an isothiazole ring, and most preferably a pyrazole ring.
(D) B ¹ and B ² are each -CR ¹ =, - CR ² = a and, and these R ^1, R ² are each preferably a hydrogen atom, a halogen atom, a cyano group, a carbamoyl group, a carboxyl group, An alkyl group, a hydroxy group, and an alkoxy group are more preferable, and a hydrogen atom, a cyano group, a carbamoyl group, and an alkyl group are more preferable.

  As for the preferred combination of substituents of the compound represented by the general formula (VI), a compound in which at least one of various substituents is the above preferred group is preferable, and more various substituents are the above preferred groups. Are more preferred, and compounds in which all substituents are the preferred groups are most preferred.

  Although the compound represented by the general formula (VI) may be produced by any method, for example, it can be produced by the following method.

(A) A compound represented by the following general formula (VIII) is reacted with a diazotizing agent to form a diazonium salt.
(B) The diazonium salt formed in the step (a) is reacted with a coupling agent represented by the following general formula (IX) to form a compound represented by the general formula (VI).
(C) In the presence of a base, the compound formed in the step (b) is reacted with an alkylating agent, an arylating agent, or a heterylating agent to introduce a substituent such as an alkyl group, and the above general formula (VI) Is formed.

一般式（IX）

Formula (VIII)

General formula (IX)

(In the formula, A, G, B ¹ , B ² , R ⁵ and R ⁶ have the same meanings as in the general formula (VI)).
Furthermore, when a water-soluble group is introduced into the compound of the general formula (VI), an electrophilic reaction is used. Examples of the electrophilic reaction include sulfonation, Mannich reaction, and Friedel-Crafts reaction. Of these, sulfonation is preferred.

  Specific examples of the compound represented by formula (VI) that can be preferably used in the present invention are shown below.

で表される化合物及び式（４）で表される化合物の塩を挙げることができる。 As a black dye that can be suitably used in the present invention, the following formula (4):

And a salt of the compound represented by the formula (4).

In the above formula (4), R ¹ represents a phenyl group having a substituent or a naphthyl group having a substituent. Further, in formula (4), R ² represents a phenylene group having a substituent or a naphthylene group having a substituent. Further, in formula (4), R ³ represents a 5- to 7-membered heterocyclic group having at least one double bond and a substituent. Further, the substituents in R ^{1 to} R ³ are independently OH, SO ₃ H, PO ₃ H ₂ , CO ₂ H, NO ₂ , NH ₂ , a C1-4 alkyl group, a substituted alkyl group, C1 -4 represents a group selected from the group consisting of alkoxy groups, substituted alkoxy groups, amino groups, substituted amino groups, and substituted phenyl groups.

Further substituted alkyl groups _{mentioned, OH, SO 3 H, PO} 3 H 2, CO 2 H, and C1~4 alkyl substituted with one or more groups selected from the group consisting of NH ₂ group It is preferably selected from the group. Also, substituted alkoxy groups _{mentioned, OH, SO 3 H, PO} 3 H 2, CO 2 H, and C1~4 alkoxy substituted with one or more groups selected from the group consisting of NH ₂ group It is preferably selected from the group. Further, substituted amino groups _{mentioned, OH, SO 3 H, PO} 3 H 2, CO 2 H, and from the group consisting of NH ₂ groups selected been C1~4 substituted with one or more groups It is preferably selected from the group consisting of amino groups having one or two alkyl groups. The substituted phenyl group is a group consisting of OH, SO ₃ H, PO ₃ H ₂ , CO ₂ H, NH ₂ , a C1-4 alkyl group, and a substituted C1-4 alkyl group. It is preferably selected from the group consisting of phenyl groups having one or two substituents selected from:

（式（５）中、Ｒ¹〜Ｒ⁹は独立して、Ｈ、ＯＨ、ＳＯ₃Ｈ、ＰＯ₃Ｈ₂、ＣＯ₂Ｈ、ＮＯ₂、及びＮＨ₂からなる群から選ばれる基を表す。）
で表される化合物であることが特に好ましい。 Furthermore, as a compound represented by the said Formula (4) used for this invention, following formula | equation (5):

(In the formula (5), R ^{1 to} R ⁹ independently represent a group selected from the group consisting of H, OH, SO ₃ H, PO ₃ H ₂ , CO ₂ H, NO ₂ , and NH ₂ . )
The compound represented by the formula is particularly preferred.

  The black aqueous ink composition that can be preferably used in the present invention is a composition containing at least one black dye, and the black dye is a compound represented by the above formula (4) (hereinafter simply referred to as compound ( 4) and at least one selected from the group consisting of salts of compound (4) is contained in the ink composition.

As the compound (4), compounds represented by the following formulas (6) to (12) are particularly preferable.

The compound represented by the above formula (4) or formula (5) can be appropriately synthesized by using a preferable method. For example, each compound has four corresponding structures bonded by three azo groups. It can be synthesized by combining building blocks having azo couplings. That is, for example, when the dihydroxynaphthalene skeleton portion represented by the formula (4) is represented by Q, the compound of the formula (4) is R ³ —N═N—R ² —N═N—Q—N═N—R Can be represented by ¹ . One specific method for synthesizing this compound is schematically shown. First, a diazonium salt obtained by diazotizing R ¹ —NH ₂ is reacted with QH to give R ¹ —N═N—QH. Next, the compound obtained by diazotizing CH ₃ CON-R ² —NH ₂ and R ¹ —N═N—QH are coupled to give R ¹ —N═NQN═N—R ² NCOCH ₃ . Synthesize. The acetyl group of this compound is removed to form an amino group and then diazotized, followed by coupling with R ³ H to synthesize R ¹ —N═N—Q—N═N—R ² —N═N—R ^3. it can.

Furthermore, as a specific example of synthesis, a synthesis example of the compound represented by the formula (6) will be described below.
5-acetylamino-2-aminobenzenesulfonic acid (23.0 g, 0.10 mol) was added to water (300 ml) containing concentrated nitric acid (30 ml). Sodium nitrite (6.9 g) was added over 10 minutes at a temperature of 0-5 ° C. After 60 minutes, excess nitrous acid was decomposed, and the resulting diazonium salt solution was slowly dissolved in water (500 g) while maintaining the pH of 8 to 9 at 5 to 10 ° C. To a solution of naphthalene-3,6-disulfonic acid (32.0 g, 0.10 mol). It was confirmed by HPLC that this reaction proceeded quantitatively. This gave a solution containing the coupling product (referred to as dye base).

Then 5-nitro-2-aminobenzenesulfonic acid (43.6 g, 0.20 mol) was added to water (500 g) containing concentrated hydrochloric acid (60 g). Sodium nitrite (13.8 g) was added over 15 minutes at a temperature of 0-5 ° C. After 60 minutes, the obtained diazonium salt solution was added to the above dye base to which tetrahydrofuran (1000 g) had been previously added over 120 minutes while maintaining 5 to 10 ° C. and pH 6 to 7. After 5 hours, the resulting precipitate was collected and dried in a dryer to give a dark red solid (55.3 g). This dark red solid was dissolved in water (1000 ml) and heated to 80 ° C. Sodium hydroxide (10 g) was added and the temperature was kept at 80 ° C. for an additional 8 hours. After 8 hours, the pH was adjusted to 7-8 using concentrated hydrochloric acid, and the solution was allowed to cool to room temperature. The solution was dialyzed (less than 50 μScm ⁻¹ ) using Visking ™ tubing, then filtered using a filter and dried in a dryer to yield 47.2 g of a black solid.

The black solid obtained above was redissolved in water at pH 7-9, but lithium hydroxide was used to adjust the pH. Then sodium nitrite (8.3 g) was added and stirred for 10 minutes. The dye / nitrite solution was then transferred into ice water (100 ml) containing concentrated hydrochloric acid (30 g). On standing, the temperature rose to 15-25 ° C., but was left for 3 hours. The obtained diazodium salt solution was charged with 1- (4-sulfophenyl) -3-carboxy-5-pyrazolone (17.9 g, 0.06 mol) over 120 minutes while maintaining pH 15 to 20 ° C. and pH 6 to 7. ). This pH was maintained by adding lithium hydroxide. The solution is then dialyzed (less than 50 μScm ⁻¹ ) using Visking ™ tubing, further filtered using a filter and dried in a drier to yield 60.0 g of the compound represented by the formula (6). Obtained as a black solid.

In the present specification, the salt of the compound represented by the formula (4) includes a salt of the compound represented by the formula (4) and a partial salt of the compound represented by the formula (4). Further, the salt and the partial salt include complex salts. The partial salt of the compound (4) refers to a salt composed of the compound (4) with an ion equivalent to an amount less than the equivalent of the protonic acid group of the compound (4). The complex salt refers to a case where one molecule of the compound (4) forms a salt with two or more kinds of ions. Salts of the above compounds (4), alkali metal salts, ammonium salts of the compounds (4) is OH, SO ₃ H, the compound if it has a protonic acid group, such as PO ₃ H ₂ group (4) and, Examples of the organic ammonium salt and one or more selected from the group consisting of complex salts containing two or more selected from the group consisting of these various metals, ammonium, and organic ammonium can be exemplified, but the present invention is not limited thereto. . Examples of the alkali metal salt include lithium salts, sodium salts, potassium salts, cesium salts, and salts containing two or more of these metals, and lithium salts and sodium salts are particularly preferable.

  As a salt of the said compound (4) and compound (4), only 1 type can be used or 2 or more types can be used together. When two or more kinds are used in combination, two or more kinds of compounds selected from each category of the compound (4) or the salt of the compound (4) may be used. It can also be used.

  Any colorant can be used in the yellow ink composition, but at least selected from the group consisting of a compound represented by the following formula (13) and a compound represented by the following formula (14): It is preferable to include one kind.

［式中、Ｒ₅、Ｒ₅'、Ｒ₆及びＲ₆'は、独立して、ＣＨ₃、ＯＣＨ₃を表し、Ｚ及びＺ'は、独立して、

のいずれかの構造を有するものであり、互いに同一であっても異なっていても良い。ここで、Ｍは、Ｈ，Ｌｉ，Ｎａ，Ｋ，アンモニウムまたは有機アミン類を表し、ｎは１または２の整数である。］

[Wherein R ₅ , R ₅ ′, R ₆ and R ₆ ′ independently represent CH ₃ , OCH ₃ , and Z and Z ′ independently represent

These structures may be the same as or different from each other. Here, M represents H, Li, Na, K, ammonium, or organic amines, and n is an integer of 1 or 2. ]

  The colorant contained in the yellow ink composition can be selected from a group consisting of the compound represented by the formula (13) and the compound represented by the formula (14). May be used.

  The colorant color density in the ink composition can be appropriately selected according to the color value of the compound used as the colorant. It is preferable that the color density be secured, and the concentration should be such that it is easy to ensure reliability such as physical properties and clogging properties to be satisfied as the ink-jet ink composition.

The ink composition of the present invention may further contain a humectant selected from water-soluble organic solvents and / or saccharides having a vapor pressure lower than that of pure water.
By including the humectant, the ink can be moisturized by suppressing evaporation of moisture in the ink jet recording system. In addition, if it is a water-soluble organic solvent, the viscosity can be easily changed without improving the ejection stability or changing the ink characteristics.
The water-soluble organic solvent refers to a medium having an ability to dissolve a solute, and is selected from organic and water-soluble solvents having a vapor pressure smaller than that of water. Specifically, ethylene glycol, propylene glycol, butanediol, pentanediol, 2-butene-1,4-diol, 2-methyl-2,4-pentanediol, glycerin, 1,2,6-hexanetriol, diethylene glycol Desirable are polyhydric alcohols such as triethylene glycol and dipropylene glycol, ketones such as acetonyl acetone, esters such as γ-butyrolactone and triethyl phosphate, furfuryl alcohol, tetrahydrofurfuryl alcohol, thiodiglycol and the like. .
The saccharide is preferably maltitol, sorbitol, gluconolactone, maltose or the like.
The humectant is preferably added in an amount of 5 to 50% by weight, more preferably 5 to 30% by weight, and still more preferably 5 to 20% by weight with respect to the total amount of the ink composition. If it is 5% by weight or more, moisture retention can be obtained, and if it is 50% by weight or less, it is easy to adjust the viscosity used for inkjet recording.

The ink composition of the present invention preferably contains a nitrogen-containing organic solvent as a solvent. Examples of the nitrogen-containing organic solvent include 1,3-dimethyl-2-imidazolidinone, 2-pyrrolidone, N-methyl-2-pyrrolidone, and ε-caprolactam. Among them, 2-pyrrolidone is preferably used. be able to. They can be used alone or in combination of two or more.
The content is preferably 0.5 to 10% by weight, and more preferably 1 to 5% by weight. By making the content 0.5% by weight or more, it is possible to improve the solubility of the colorant in the present invention by adding it. The material resistance with the member is not deteriorated.

  In addition, the ink composition of the present invention contains a nonionic surfactant as an additive that is effective for obtaining rapid fixing (penetration) of the ink and maintaining the roundness of one dot. Is preferred.

  Examples of nonionic surfactants include acetylene glycol surfactants. Specific examples of acetylene glycol surfactants include Surfinol 465, Surfinol 104 (trade name, manufactured by Air Products and Chemicals, Inc.), Olphine STG, Olphine E1010 (trade name, Nissin Chemical Industry Co., Ltd.) ), Product name) and the like. The amount of addition is 0.1 to 5% by weight, preferably 0.5 to 2% by weight. When the addition amount is 0.1% by weight or more, sufficient penetrability can be obtained, and when the addition amount is 5% by weight or less, it is easy to prevent image blurring.

  Furthermore, by adding glycol ethers as penetration enhancers in addition to nonionic surfactants, the penetration is further increased and the bleed at the boundary with the adjacent color ink is reduced when color printing is performed. And a very clear image can be obtained.

  As glycol ethers, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, dipropylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, triethylene glycol monobutyl ether Etc. The addition amount is 3 to 30% by weight, preferably 5 to 15% by weight. If the addition amount is less than 3% by weight, the effect of preventing bleeding cannot be obtained. If the amount exceeds 30% by weight, not only the image will bleed, but also oily separation will occur, so the dissolution aid for these glycol ethers will be required, which will increase the viscosity of the ink. Becomes difficult.

  Furthermore, the ink composition of the present invention includes a pH adjuster such as triethanolamine or alkali metal hydroxide, a hydrotrope such as urea and its derivatives, a water-soluble polymer such as sodium alginate, if necessary. A water-soluble resin, a fluorine-based surfactant, a fungicide, a rust inhibitor, and the like may be added.

  As a method for preparing the ink composition, for example, there is a method in which each component is sufficiently mixed and dissolved, pressure-filtered with a membrane filter having a pore size of 0.8 μm, and then deaerated using a vacuum pump.

  Next, the recording method of the present invention will be described. The recording method of the present invention is an ink jet recording system in which an ink composition is ejected as droplets from fine holes and the droplets are attached to a recording medium for recording, and the ink composition of the present invention is used as the ink composition. .

  As the ink jet recording method, any of the conventionally known methods can be used, and in particular, a method of ejecting droplets using vibration of a piezoelectric element (using an ink jet head that forms ink droplets by mechanical deformation of an electrostrictive element). Recording method) and a method using thermal energy, it is possible to perform excellent image recording.

EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited to a following example.
Example 1 (ink contact test)
Each ink composition of Bk (black), Y (yellow), M (magenta), C (cyan), LM (light magenta), and LC (light cyan) was prepared with the composition shown in Table 9, and polystyrene isobutyl (PSIB) And polypropylene (PP) elastomer (containing 100 ppm of the antioxidant represented by formula (1) (Irganox 1010 (registered trademark)) in an indirect solution at 50 ° C. for 3 days or 7 days The presence or absence of foreign matter was observed by the following method.
(1) An electroformed metal filter with an opening diameter of 10 μm is placed on the mesh filter of the filter bottle,
(2) A certain amount of ink was dropped and filtered on the electroformed metal filter under reduced pressure filtration,
(3) Observe and confirm a foreign object in a shape that appears to be a crystalline molecular complex with a metallographic microscope.
(4) It identified with the infrared absorptiometer (FT-IR) as needed.
The results are as shown in Table 11, and in the inventive examples, the generation of foreign matter was less than in the comparative examples.

In addition, the numerical value in Table 9 represents weight%. Color materials A to F represent the following compounds.
Coloring material A: Compound represented by formula (6) Coloring material B: C.I. I. Direct yellow 86
Color material C: C.I. I. Direct yellow 173
Coloring material D: Colorant 8 in Table 5
Coloring material E: Dye 15 in Table 6
Coloring material E: Compound F in Table 2
Surfactants A to C are the following compositions.

なお、界面活性剤Ｂに使用した可溶化剤は、上記式（Ａ）で表される化合物（酸性条件下で分子量２２２〜３１１のアルキル基を有するイオン性化合物を生成する）である。

In addition, the solubilizer used for the surfactant B is a compound represented by the above formula (A) (generates an ionic compound having an alkyl group with a molecular weight of 222 to 311 under acidic conditions).

Example 2 (Antioxidant dissolution test)
The temperature characteristics of elution of the antioxidant (Irganox 1010 (registered trademark)) used for the ink contact member were tested by the following method.
(1) Irganox 1010 was mixed and stirred at each temperature of 60 ° C., 40 ° C., and room temperature (25 ° C.) to each of the magenta ink compositions of the present invention and the comparative example used in Example 1 to obtain a soluble portion. Melted in. The mixture was filtered with a 0.8 μm membrane filter at that temperature.
(2) The amount of Irganox 1010 contained in the filtered solution was quantified by the following method.
First, a certain amount of acetone is added to a constant volume, ultrasonic waves are applied, and the supernatant is filtered through a 0.8 μm membrane filter. This is used as a measurement sample, and Irganox 1010 is qualitatively analyzed by high performance liquid chromatography (HPLC). Quantification was performed.
The measurement conditions are as follows.
Apparatus: 2690/2487 (made by Nippon Waters)
Column: Xterra MS C8 2.5μ 4.6 × 50 mm (Nippon Waters)
Mobile phase: Water / acetonitrile = 40/60 → 0/100 20 minutes linear gradient Flow rate: 1.0 mL / min Injection volume: 5 μL
Detection: 280 nm
The results are shown in Table 12.
It can be seen that at any temperature, the ink composition of the present invention has little elution of the antioxidant, and this characteristic can reduce the generation of foreign matter even if the ink contact member has been in contact with the ink contact member for a long time.

Example 3 (endurance test with actual machine)
A printing durability test was conducted with a printer containing Irganox 1010 in an ink contact member exceeding 100 ppm. Each ink composition is the same as shown in Example 1.
The print endurance test was performed by printing the evaluation pattern repeatedly in a room temperature environment and replacing the ink cartridge when the ink end was reached. The number of ink cartridges used was equivalent to the guaranteed life of the printer, and whether or not there was a printing defect was confirmed. When a malfunction occurred, the printer was disassembled and checked for clogging due to foreign matter.
In sample 2 in which an ink set was composed of the ink composition of the present invention, there was no problem due to foreign matter clogging, and printing was good. On the other hand, in sample 1 using the ink composition of the comparative example, it was confirmed that cyan, light magenta, and light cyan were unable to eject due to clogging of foreign matter at the supply port (flow passage restricting portion) of the print head.
These results are shown in Table 13.

  ADVANTAGE OF THE INVENTION According to this invention, the ink composition by which generation | occurrence | production of the foreign material by contact with the ink contact member of an inkjet printer was suppressed can be provided, and the stable printing in inkjet printing can be enabled.

Claims (5)

  An ink composition for ink-jet recording comprising a dye and water, wherein the ink composition does not contain an ionic compound (excluding the dye) having a molecular weight of 222 to 311 and containing an alkyl group.   The ink composition according to claim 1, wherein the ink jet recording method is a recording method using an ink jet head that forms ink droplets by mechanical deformation of an electrostrictive element. The ink composition according to claim 1 or 2, wherein the ink jet recording method is an ink jet recording method using an ink jet printer having an ink contact member containing more than 100 ppm of a compound represented by the following formula (1).

  An ink jet recording method for performing recording by ejecting droplets of an ink composition and attaching the droplets to a recording medium, wherein the ink composition according to any one of claims 1 to 3 is used as the ink composition. An ink jet recording method using the method. A recorded matter recorded by the ink jet recording method according to claim 4.