WO2010024317A1 - アゾ顔料を含むインクジェット記録用水性インク - Google Patents
アゾ顔料を含むインクジェット記録用水性インク Download PDFInfo
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- WO2010024317A1 WO2010024317A1 PCT/JP2009/064928 JP2009064928W WO2010024317A1 WO 2010024317 A1 WO2010024317 A1 WO 2010024317A1 JP 2009064928 W JP2009064928 W JP 2009064928W WO 2010024317 A1 WO2010024317 A1 WO 2010024317A1
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- general formula
- carbon atoms
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- 239000000049 pigment Substances 0.000 title claims abstract description 147
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910001868 water Inorganic materials 0.000 title claims abstract description 87
- 125000003118 aryl group Chemical group 0.000 claims abstract description 116
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 66
- 229920000642 polymer Polymers 0.000 claims abstract description 54
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 53
- 239000002245 particle Substances 0.000 claims abstract description 44
- 150000003839 salts Chemical class 0.000 claims abstract description 28
- 125000005647 linker group Chemical group 0.000 claims abstract description 18
- 239000003021 water soluble solvent Substances 0.000 claims abstract description 9
- -1 phenoxyethyl Chemical group 0.000 claims description 231
- 125000004432 carbon atom Chemical group C* 0.000 claims description 198
- 125000000217 alkyl group Chemical group 0.000 claims description 133
- 125000000623 heterocyclic group Chemical group 0.000 claims description 123
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 108
- 125000001424 substituent group Chemical group 0.000 claims description 66
- 125000003277 amino group Chemical group 0.000 claims description 64
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 57
- 125000003545 alkoxy group Chemical group 0.000 claims description 56
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 56
- 229910052799 carbon Inorganic materials 0.000 claims description 49
- 125000003282 alkyl amino group Chemical group 0.000 claims description 25
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 25
- 125000003342 alkenyl group Chemical group 0.000 claims description 23
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- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 19
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 15
- 125000004391 aryl sulfonyl group Chemical group 0.000 claims description 15
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- 239000003795 chemical substances by application Substances 0.000 description 14
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 14
- JIHQDMXYYFUGFV-UHFFFAOYSA-N 1,3,5-triazine Chemical group C1=NC=NC=N1 JIHQDMXYYFUGFV-UHFFFAOYSA-N 0.000 description 13
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- 238000009826 distribution Methods 0.000 description 11
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- 238000006116 polymerization reaction Methods 0.000 description 11
- 125000004076 pyridyl group Chemical group 0.000 description 11
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- 125000004414 alkyl thio group Chemical group 0.000 description 10
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 10
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 9
- 125000004442 acylamino group Chemical group 0.000 description 9
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- 150000001602 bicycloalkyls Chemical group 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 125000000250 methylamino group Chemical group [H]N(*)C([H])([H])[H] 0.000 description 9
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- 238000003756 stirring Methods 0.000 description 9
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- 125000004122 cyclic group Chemical group 0.000 description 8
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- 238000001914 filtration Methods 0.000 description 8
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- 239000002609 medium Substances 0.000 description 8
- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 8
- 230000003472 neutralizing effect Effects 0.000 description 8
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 8
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- 125000004105 2-pyridyl group Chemical group N1=C([*])C([H])=C([H])C([H])=C1[H] 0.000 description 7
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
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- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229960004321 pentaerithrityl tetranitrate Drugs 0.000 description 1
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 description 1
- UWJJYHHHVWZFEP-UHFFFAOYSA-N pentane-1,1-diol Chemical compound CCCCC(O)O UWJJYHHHVWZFEP-UHFFFAOYSA-N 0.000 description 1
- WCVRQHFDJLLWFE-UHFFFAOYSA-N pentane-1,2-diol Chemical compound CCCC(O)CO WCVRQHFDJLLWFE-UHFFFAOYSA-N 0.000 description 1
- LQPLDXQVILYOOL-UHFFFAOYSA-I pentasodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O LQPLDXQVILYOOL-UHFFFAOYSA-I 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 125000003356 phenylsulfanyl group Chemical group [*]SC1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- DJFBJKSMACBYBD-UHFFFAOYSA-N phosphane;hydrate Chemical class O.P DJFBJKSMACBYBD-UHFFFAOYSA-N 0.000 description 1
- 125000005499 phosphonyl group Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 description 1
- SIOXPEMLGUPBBT-UHFFFAOYSA-N picolinic acid Chemical compound OC(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-N 0.000 description 1
- 125000004193 piperazinyl group Chemical group 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000001955 polymer synthesis method Methods 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 229940096992 potassium oleate Drugs 0.000 description 1
- MLICVSDCCDDWMD-KVVVOXFISA-M potassium;(z)-octadec-9-enoate Chemical compound [K+].CCCCCCCC\C=C/CCCCCCCC([O-])=O MLICVSDCCDDWMD-KVVVOXFISA-M 0.000 description 1
- XRVCFZPJAHWYTB-UHFFFAOYSA-N prenderol Chemical compound CCC(CC)(CO)CO XRVCFZPJAHWYTB-UHFFFAOYSA-N 0.000 description 1
- 229950006800 prenderol Drugs 0.000 description 1
- 125000001844 prenyl group Chemical group [H]C([*])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QJWFJOSRSZOLKK-UHFFFAOYSA-N prop-2-enamide Chemical compound NC(=O)C=C.NC(=O)C=C QJWFJOSRSZOLKK-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 229940070891 pyridium Drugs 0.000 description 1
- WRHZVMBBRYBTKZ-UHFFFAOYSA-N pyrrole-2-carboxylic acid Chemical compound OC(=O)C1=CC=CN1 WRHZVMBBRYBTKZ-UHFFFAOYSA-N 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 125000000719 pyrrolidinyl group Chemical group 0.000 description 1
- 229940079889 pyrrolidonecarboxylic acid Drugs 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000019259 sodium dehydroacetate Nutrition 0.000 description 1
- 229940079839 sodium dehydroacetate Drugs 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- DZCAZXAJPZCSCU-UHFFFAOYSA-K sodium nitrilotriacetate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CC([O-])=O DZCAZXAJPZCSCU-UHFFFAOYSA-K 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- LROWVYNUWKVTCU-STWYSWDKSA-M sodium sorbate Chemical compound [Na+].C\C=C\C=C\C([O-])=O LROWVYNUWKVTCU-STWYSWDKSA-M 0.000 description 1
- 235000019250 sodium sorbate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- DSOWAKKSGYUMTF-GZOLSCHFSA-M sodium;(1e)-1-(6-methyl-2,4-dioxopyran-3-ylidene)ethanolate Chemical compound [Na+].C\C([O-])=C1/C(=O)OC(C)=CC1=O DSOWAKKSGYUMTF-GZOLSCHFSA-M 0.000 description 1
- HCJLVWUMMKIQIM-UHFFFAOYSA-M sodium;2,3,4,5,6-pentachlorophenolate Chemical compound [Na+].[O-]C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl HCJLVWUMMKIQIM-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000003335 steric effect Effects 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 125000006296 sulfonyl amino group Chemical group [H]N(*)S(*)(=O)=O 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 150000005621 tetraalkylammonium salts Chemical class 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 125000001113 thiadiazolyl group Chemical group 0.000 description 1
- 125000002769 thiazolinyl group Chemical group 0.000 description 1
- QERYCTSHXKAMIS-UHFFFAOYSA-N thiophene-2-carboxylic acid Chemical compound OC(=O)C1=CC=CS1 QERYCTSHXKAMIS-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- ZTWTYVWXUKTLCP-UHFFFAOYSA-N vinylphosphonic acid Chemical compound OP(O)(=O)C=C ZTWTYVWXUKTLCP-UHFFFAOYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- FYGDTMLNYKFZSV-BYLHFPJWSA-N β-1,4-galactotrioside Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@H](CO)O[C@@H](O[C@@H]2[C@@H](O[C@@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-BYLHFPJWSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
- C09B33/02—Disazo dyes
- C09B33/12—Disazo dyes in which the coupling component is a heterocyclic compound
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/0025—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds
- C09B29/0029—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing only nitrogen as heteroatom
- C09B29/0037—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing only nitrogen as heteroatom containing a five-membered heterocyclic ring with two nitrogen atoms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/0025—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds
- C09B29/0074—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing nitrogen and sulfur as heteroatoms
- C09B29/0077—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing nitrogen and sulfur as heteroatoms containing a five-membered heterocyclic ring with one nitrogen and one sulfur as heteroatoms
- C09B29/0081—Isothiazoles or condensed isothiazoles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/34—Monoazo dyes prepared by diazotising and coupling from other coupling components
- C09B29/36—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds
- C09B29/3604—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom
- C09B29/3647—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a five-membered ring with two nitrogen atoms as heteroatoms
- C09B29/3652—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a five-membered ring with two nitrogen atoms as heteroatoms containing a 1,2-diazoles or hydrogenated 1,2-diazoles
- C09B29/3656—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a five-membered ring with two nitrogen atoms as heteroatoms containing a 1,2-diazoles or hydrogenated 1,2-diazoles containing amino-1,2-diazoles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
- C09B33/18—Trisazo or higher polyazo dyes
- C09B33/24—Trisazo dyes of the type
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0001—Post-treatment of organic pigments or dyes
- C09B67/0004—Coated particulate pigments or dyes
- C09B67/0008—Coated particulate pigments or dyes with organic coatings
- C09B67/0009—Coated particulate pigments or dyes with organic coatings containing organic acid derivatives
- C09B67/001—Coated particulate pigments or dyes with organic coatings containing organic acid derivatives containing resinic acid derivatives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/006—Preparation of organic pigments
- C09B67/0066—Aqueous dispersions of pigments containing only dispersing agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/324—Inkjet printing inks characterised by colouring agents containing carbon black
- C09D11/326—Inkjet printing inks characterised by colouring agents containing carbon black characterised by the pigment dispersant
Definitions
- the present invention relates to a water-based ink for ink-jet recording containing a novel azo pigment that is excellent in dispersion stability and ejection stability, and realizes an image quality free from density unevenness and unevenness.
- inkjet recording media Various media have been used as inkjet recording media, and high-quality image quality is required not only for inkjet dedicated paper but also for printing media such as commercially available plain paper, high-quality paper, coated paper, and art paper.
- a pigment is preferable as an ink coloring material that gives fastness such as water resistance and light resistance to plain paper and printing media, and various studies have been made on water-based pigment ink including the viewpoint of cost.
- azo pigments are preferably used as yellow pigments for inkjet recording.
- density unevenness and streak unevenness occur in ink that has been aged for a long time or at a high temperature.
- An aqueous dispersion for inkjet recording having an aqueous pigment dispersion containing CI Pigment Yellow 74 and an anionic group-containing organic polymer compound is disclosed (for example, see Patent Document 1).
- C.I. I. By using Pigment Yellow 74, and a copolymer of n-butyl methacrylate, n-butyl acrylate, 2-hydroxyethyl methacrylate, methacrylic acid and styrene as a dispersant, dispersibility, dispersion stability and clearness It is supposed that an image can be formed.
- the water-based ink for ink-jet recording constituted by using the pigment aqueous dispersion described in Patent Document 1 is deteriorated in discharge accuracy and used in density unevenness and streak unevenness when used after being stored for a long period of time or after aging at a high temperature. It was found that the level was not satisfactory.
- An object of the present invention is to provide a water-based ink for ink jet recording that has excellent ejection accuracy and can suppress the occurrence of density unevenness and streak unevenness even after storage for a long period of time or after exposure to high temperatures. It is in.
- the inventors of the present invention provide a vinyl polymer having a specific structure in an azo pigment having a heterocycle substituted with a carbonyl group capable of forming an intramolecular hydrogen bond on a carbon atom adjacent to a carbon atom bonded to an azo group.
- Ink-jet recording water that is excellent in ejection accuracy and can suppress the occurrence of uneven density and streaks even after storage for a long period of time or after exposure to high temperatures, by forming colored particles using It was found that ink could be obtained. That is, the object of the present invention is achieved by the following means.
- a water-based ink for ink-jet recording comprising vinyl polymer particles containing A and B and a water-soluble solvent.
- A An azo pigment represented by the following general formula (1), a tautomer thereof, a salt or a hydrate thereof
- B a hydrophobic structural unit having an aromatic ring bonded to a polymer main chain via a linking group ( Vinyl polymer containing a) and hydrophilic structural unit (b)
- Q represents a 5- to 7-membered heterocycle together with a carbon atom
- W represents an alkoxy group, an amino group, an alkyl group or an aryl group
- X 1 and X 2 are each independently a hydrogen atom.
- R 1 represents a hydrogen atom or a substituent
- R 2 represents a heterocyclic group
- n represents an integer of 1 to 4.
- n 2 Represents a dimer via Q, W, X 1 , X 2 , R 1 , or R 2.
- R 1 represents a hydrogen atom, a methyl group, or a halogen atom
- L 1 represents —COO—, —OCO—, —CONR 2 —, —O—, or substituted or unsubstituted phenylene
- R 2 represents a hydrogen atom or an alkyl group
- L 2 represents a single bond or a divalent linking group
- Ar 1 represents a monovalent group derived from an aromatic ring.
- the hydrophobic structural unit (a) further comprises a hydrophobic structural unit (a2) derived from an alkyl ester of acrylic acid or methacrylic acid, for inkjet recording according to [1] or [2] Water based ink.
- At least one selected from the structural unit derived from phenoxyethyl (meth) acrylate and the structural unit derived from benzyl (meth) acrylate as the hydrophobic structural unit (a) is 20 masses in total with respect to the total mass of the vinyl polymer.
- the hydrophilic structural unit (b) contains at least one selected from structural units derived from acrylic acid and methacrylic acid in a total amount of 30% by mass or less based on the total mass of the vinyl polymer.
- Y in general formula (3) represents a hydrogen atom or a substituent
- G represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group
- W, X 1 , X 2 , R 1 , R 2 and n have the same meanings as W, X 1 , X 2 , R 1 , R 2 and n in the general formula (1).
- Z represents a 5- to 8-membered nitrogen-containing heterocycle
- Y 1 , Y 2 , R 11 , and R 12 each independently represent a hydrogen atom or a substituent
- G 1 , G 2 Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group
- W 1 and W 2 each independently represent an alkoxy group, an amino group or an alkyl group.
- an aqueous ink for ink jet recording that has excellent ejection accuracy and can suppress the occurrence of density unevenness and streak unevenness even after long-term storage or after exposure to high temperatures. Can do.
- the water-based ink for inkjet recording of the present invention contains vinyl polymer particles containing A and B and a water-soluble solvent.
- Q represents a 5- to 7-membered heterocycle together with a carbon atom
- W represents an alkoxy group, an amino group, an alkyl group or an aryl group
- X 1 and X 2 are each independently a hydrogen atom.
- R 1 represents a hydrogen atom or a substituent
- R 2 represents a heterocyclic group
- n represents an integer of 1 to 4.
- n 2 Represents a dimer via Q, W, X 1 , X 2 , R 1 , or R 2.
- hydrophobic structural unit (a) having an aromatic ring bonded to the main chain via a linking group is not particularly limited, Examples thereof include a benzene ring, a condensed aromatic ring having 8 or more carbon atoms, a hetero ring in which aromatic rings are condensed, or a benzene ring in which two or more are connected.
- the condensed aromatic ring having 8 or more carbon atoms is an aromatic ring in which at least two or more benzene rings are condensed and / or an alicyclic carbonization in which at least one aromatic ring is condensed with the aromatic ring.
- the heterocycle in which the aromatic ring is condensed is a compound in which an aromatic compound not containing a hetero atom (preferably a benzene ring) and a cyclic compound having a hetero atom are at least condensed.
- the cyclic compound having a hetero atom is preferably a 5-membered ring or a 6-membered ring.
- a hetero atom a nitrogen atom, an oxygen atom, or a sulfur atom is preferable.
- the cyclic compound having a hetero atom may have a plurality of hetero atoms, and in this case, the hetero atoms may be the same as or different from each other.
- Specific examples of the heterocyclic ring condensed with an aromatic ring include phthalimide, acridone, carbazole, benzoxazole, and benzothiazole.
- benzene ring connected two or more include a 4-phenyl-phenyl ring, a 4 ′′ -cyano-phenyl-4-phenyl ring, and the like.
- linking group in the hydrophobic structural unit (a) examples include —COO—, —OCO—, —CONR 2 —, —O—, an alkylene group, a substituted or unsubstituted phenylene group, and combinations thereof. it can.
- Examples of the main chain in the hydrophobic structural unit (a) include vinyl bonds, ester bonds and urethane bonds, with vinyl bonds being preferred.
- the hydrophobic structural unit (a) having an aromatic ring bonded to the main chain of the polymer vinyl polymer via a linking group preferably includes the hydrophobic structural unit (a1) represented by the general formula (I).
- the hydrophobic structural unit (a) may further have a hydrophobic structural unit (a2) derived from an alkyl ester of acrylic acid or methacrylic acid.
- hydrophobic structural unit (a1) represented by general formula (I) The content of the hydrophobic structural unit (a1) represented by the general formula (I) depends on the dispersion stability of the pigment, ejection accuracy, and washing. From the viewpoint of safety, it is preferably 10% by mass or more and less than 75% by mass of the total mass of the vinyl polymer, more preferably 20% by mass or more and less than 70% by mass, and 30% by mass or more and less than 60% by mass. It is particularly preferred that
- R 1 represents a hydrogen atom, a methyl group, or a halogen atom
- L 1 represents —COO—, —OCO—, —CONR 2 —, —O—, or a substituted or unsubstituted phenylene group
- R 2 represents a hydrogen atom or an alkyl group.
- L 2 represents a single bond or a divalent linking group.
- Ar 1 represents a monovalent group derived from an aromatic ring.
- R 1 represents a hydrogen atom, a methyl group, or a halogen atom, more preferably a hydrogen atom or a methyl group, and still more preferably a methyl group.
- the alkyl group represented by R 2 is preferably an alkyl group having 1 to 10 carbon atoms, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, and a t-butyl group. it can.
- substituent include, but are not limited to, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, and a cyano group.
- L 1 represents —COO—, —OCO—, —CONR 2 —, —O—, or a substituted or unsubstituted phenylene group, preferably —COO—.
- L 2 is a divalent linking group, it is preferably a linking group having 1 to 30 carbon atoms, more preferably a linking group having 1 to 25 carbon atoms, and still more preferably a linking group having 1 to 20 carbon atoms. It is.
- the aromatic ring in Ar 1 is not particularly limited, and examples thereof include a benzene ring, a condensed aromatic ring having 8 to 18 carbon atoms, a hetero ring in which an aromatic ring is condensed, or a benzene ring in which two or more are connected. It is done.
- the condensed aromatic ring having 8 or more carbon atoms is an aromatic ring in which at least two or more benzene rings are condensed and / or an alicyclic carbonization in which at least one aromatic ring is condensed with the aromatic ring.
- the heterocycle in which the aromatic ring is condensed is a compound in which an aromatic compound not containing a hetero atom (preferably a benzene ring) and a cyclic compound having a hetero atom are at least condensed.
- the cyclic compound having a hetero atom is preferably a 5-membered ring or a 6-membered ring.
- a hetero atom a nitrogen atom, an oxygen atom, or a sulfur atom is preferable.
- the cyclic compound having a hetero atom may have a plurality of hetero atoms, and in this case, the hetero atoms may be the same as or different from each other.
- heterocyclic ring condensed with an aromatic ring examples include a phthalimide ring, an acridone ring, a carbazole ring, a benzoxazole ring, and a benzothiazole ring.
- the hydrophobic structural unit (a1) represented by the general formula (I) is preferably at least one selected from structural units derived from acrylate and (meth) acrylate. If it is at least one selected from structural units derived from acrylate and (meth) acrylate, an aromatic ring can be bonded to the main chain via an ester bond, and mutual properties such as adsorptivity to the pigment can be obtained. An aromatic ring that can be expected to act can take a three-dimensional structure with a degree of freedom from the main chain.
- the hydrophobic structural unit (a1) represented by the general formula (I) is a benzene ring, a condensed aromatic ring having 8 or more carbon atoms, a hetero ring condensed with an aromatic ring, or a benzene ring in which two or more are connected. It preferably contains a monovalent group derived from This is because the use of the aromatic ring can exert interaction such as adsorptivity with the pigment.
- Ar 1 is preferably a benzene ring, naphthalene ring, anthracene ring, fluorene ring, phenanthrene ring, acenaphthene ring, phthalimide ring, acridone ring, carbazole ring, benzoxazole ring, or benzothiazole ring, and a benzene ring, naphthalene ring, acridone ring Is more preferable, and a benzene ring is still more preferable.
- R 1 is a hydrogen atom or a methyl group
- L 1 is (main chain side) —COO—
- L 2 is at least one selected from an alkyleneoxy group and an alkylene group.
- Ar 1 is an aryl ring, more preferably, R 1 is a hydrogen atom or a methyl group
- L 1 is (mainly (Chain side) —COO—
- Ar 1 is a combination of structural units in which a benzene ring is present.
- any of benzyl acrylate, benzyl methacrylate, phenoxyethyl acrylate, and phenoxyethyl methacrylate is preferably a structural unit derived from at least one selected, and more preferably contains at least one selected from phenoxyethyl methacrylate, benzyl acrylate and benzyl methacrylate.
- the hydrophobic structural unit (a) contains at least 20% by mass of structural units derived from phenoxyethyl (meth) acrylate with respect to the total mass of the vinyl polymer.
- the hydrophobic structural unit (a) may contain a hydrophobic structural unit (a2) derived from an alkyl ester of acrylic acid or methacrylic acid.
- the alkyl ester preferably has 1 to 18 carbon atoms, more preferably 1 to 8 carbon atoms, still more preferably 1 to 4 carbon atoms, and particularly preferably 1 to 2 carbon atoms.
- the content of the hydrophobic structural unit (a2) is preferably 5% by mass or more and 70% by mass or less, and more preferably 20% by mass or more and 60% by mass or less in the polymer vinyl polymer.
- hydrophobic structural unit (a2) examples include methyl (meth) acrylate, ethyl (meth) acrylate, (iso) propyl (meth) acrylate, (iso or tertiary) butyl (meth) acrylate, cyclohexyl ( Examples include (meth) acrylates such as (meth) acrylate, dodecyl (meth) acrylate, and stearyl (meth) acrylate. Of these, methyl (meth) acrylate, ethyl (meth) acrylate, and cyclohexyl (meth) acrylate are preferred.
- hydrophilic structural unit (b) contained in the vinyl polymer in the present invention will be described.
- hydrophilic structural unit (b) include carboxylic acid-containing acrylic acid and methacrylic acid.
- hydrophilic structural unit containing a nonionic hydrophilic group can be mentioned.
- hydrophilic structural unit (b) examples include (meth) acrylates, (meth) acrylamides and vinyl esters having a hydrophilic functional group.
- hydrophilic functional group examples include a hydroxyl group, an amino group, an amide group (with a nitrogen atom unsubstituted), and an alkylene oxide polymer such as polyethylene oxide and polypropylene oxide as described later.
- hydroxyethyl (meth) acrylate, hydroxybutyl (meth) acrylate, (meth) acrylamide, aminoethyl acrylate, aminopropyl acrylate, and (meth) acrylate containing an alkylene oxide polymer are particularly preferable.
- hydrophilic structural unit (b) examples include hydrophilic structural units having an alkylene oxide polymer structure.
- the alkylene of the alkylene oxide polymer preferably has 1 to 6 carbon atoms, more preferably 2 to 6 carbon atoms, and particularly preferably 2 to 4 carbon atoms from the viewpoint of hydrophilicity.
- the degree of polymerization of the alkylene oxide polymer is preferably 1 to 120, more preferably 1 to 60, and particularly preferably 1 to 30.
- hydrophilic structural unit (b) examples include hydrophilic structural units containing a hydroxyl group.
- the number of hydroxyl groups is not particularly limited, and is preferably 1 to 4, more preferably 1 to 3, and particularly preferably 1 to 2 from the viewpoint of hydrophilicity of the vinyl polymer and compatibility with the solvent and other monomers during polymerization. preferable.
- hydrophilic structural unit (b) examples include acrylic acid and methacrylic acid.
- the content of the hydrophilic structural unit (b) is preferably 4% by mass or more and 40% by mass or less, preferably 6% by mass or more and 25% by mass or less, and 8% by mass or more and 15% by mass with respect to the total mass of the vinyl polymer. The following is more preferable.
- the vinyl polymer in the present invention is a structural unit (c) having a structure different from the hydrophobic structural unit (a1), the hydrophobic structural unit (a2), and the hydrophilic structural unit (b) ( Hereinafter, it may be simply referred to as “structural unit (c)”.
- the content of the structural unit (c) is preferably 15% by mass to 80% by mass, preferably 25% by mass to 70% by mass, and preferably 40% by mass to 60% by mass with respect to the total mass of the vinyl polymer. More preferred.
- the monomer in the case where the structural unit (c) is a hydrophobic structural unit is not particularly limited as long as it has a functional group capable of forming a polymer and a hydrophobic functional group, and any known monomers Can also be used.
- the monomer capable of forming the hydrophobic structural unit vinyl monomers and ((meth) acrylamides, styrenes, vinyl esters, etc.) are preferable from the viewpoints of availability, handleability, and versatility.
- (meth) acrylamides examples include (meth) acrylamides such as N-cyclohexyl (meth) acrylamide, N- (2-methoxyethyl) (meth) acrylamide, N, N-diallyl (meth) acrylamide, and N-allyl (meth) acrylamide. ) Acrylamides.
- styrenes examples include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, iso-propyl styrene, n-butyl styrene, tert-butyl styrene, methoxy styrene, butoxy styrene, acetoxy styrene, chlorostyrene, dichlorostyrene, Examples thereof include bromostyrene, chloromethylstyrene, methyl vinylbenzoate, ⁇ -methylstyrene, vinylnaphthalene and the like, and styrene and ⁇ -methylstyrene are preferable.
- vinyl esters examples include vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl propionate, vinyl butyrate, vinyl methoxyacetate, and vinyl benzoate. Of these, vinyl acetate is preferable. These can be used alone or in admixture of two or more.
- the vinyl polymer can be composed of only the hydrophobic structural unit (a1) and the hydrophilic structural unit (b). More preferably, the hydrophobic structural unit (a) of the vinyl polymer is at least selected from a structural unit derived from phenoxyethyl (meth) acrylate and a structural unit derived from benzyl (meth) acrylate. One total is 20% by mass or more with respect to the total mass of the vinyl polymer, and the hydrophilic structural unit (b) is selected from structural units derived from acrylic acid and methacrylic acid. What contains 30 mass% or less with respect to mass is more preferable.
- the acid value of the vinyl polymer of the present invention is preferably from 30 mgKOH / g to 300 mgKOH / g, more preferably from 40 mgKOH / g to less than 150 mgKOH / g, from the viewpoint of pigment dispersibility and storage stability. It is particularly preferably 50 mgKOH / g or more and 100 mgKOH / g.
- the acid value here is defined by the mass (mg) of KOH required to completely neutralize 1 g of the vinyl polymer, and can be measured by the method described in JIS standards (JIS K0070, 1992).
- the vinyl polymer in the present invention may be a random copolymer in which each structural unit is irregularly introduced, or may be a block copolymer in which the structural units are regularly introduced. These structural units may be synthesized in any order of introduction, and the same constituent components may be used twice or more. However, a random copolymer is used in terms of versatility and manufacturability. preferable.
- the molecular weight range of the vinyl polymer used in the present invention is a mass average molecular weight (Mw), preferably 30,000 to 150,000, more preferably 30,000 to 100,000, and still more preferably 30,000 to 80,000. It is. By setting the molecular weight within the above range, the steric repulsion effect as a dispersing agent tends to be good, and it is preferable from the viewpoint of the tendency that adsorption to the pigment does not take time due to the steric effect.
- the molecular weight distribution (expressed by mass average molecular weight value / number average molecular weight value) of the vinyl polymer used in the present invention is preferably 1 to 6, and more preferably 1 to 4.
- the number average molecular weight and the mass average molecular weight are detected by a solvent THF and a differential refractometer using a GPC analyzer using columns of TSKgel GMHxL, TSKgel G4000HxL, and TSKgel G2000HxL (both trade names manufactured by Tosoh Corporation).
- the molecular weight is expressed using polystyrene as a standard substance.
- the vinyl polymer used in the present invention can be synthesized by various polymerization methods such as solution polymerization, precipitation polymerization, suspension polymerization, precipitation polymerization, bulk polymerization, and emulsion polymerization.
- the polymerization reaction can be performed by a known operation such as a batch system, a semi-continuous system, or a continuous system.
- the polymerization initiation method includes a method using a radical initiator, a method of irradiating light or radiation, and the like.
- polymerization methods and polymerization initiation methods are, for example, the revised version of Tsuruta Junji “Polymer Synthesis Method” (published by Nikkan Kogyo Shimbun, 1971), Takatsu Otsu, Masato Kinoshita, “Experimental Methods for Polymer Synthesis” It is described in pages 154 to 154 published in 1972.
- a solution polymerization method using a radical initiator is particularly preferable.
- Solvents used in the solution polymerization method include, for example, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, tetrahydrofuran, dioxane, N, N-dimethylformamide, N, N-dimethylacetamide, benzene, toluene, acetonitrile,
- a single organic organic solvent such as methylene chloride, chloroform, dichloroethane, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, or a mixture of two or more thereof may be used, or a mixed solvent with water may be used.
- the polymerization temperature needs to be set in relation to the molecular weight of the polymer to be produced, the type of initiator, and the like, and is usually about 0 ° C. to 100 ° C., but the polymerization is preferably performed in the range of 50 to 100 ° C.
- the reaction pressure can be appropriately selected, but it is usually preferably 1 to 100 kg / cm 2 , particularly preferably about 1 to 30 kg / cm 2 .
- the reaction time is about 5 to 30 hours.
- the obtained resin may be subjected to purification such as reprecipitation.
- the ratio of the vinyl polymer added in the present invention is preferably in the range of 10% to 100%, more preferably 30% to 60%, based on the weight of the pigment.
- the azo pigment used in the present invention is represented by the general formula (1).
- the compound represented by the general formula (1) easily forms an intramolecular / intermolecular interaction of a dye molecule due to its specific structure, has a low solubility in water or an organic solvent, and has a preferable form of an azo pigment can do.
- a pigment is used by being finely dispersed as particles such as a molecular aggregate in a medium, unlike a dye used by being dissolved in water or an organic solvent in a molecular dispersion state.
- Q represents a 5- to 7-membered heterocycle together with a carbon atom
- W represents an alkoxy group, an amino group, an alkyl group or an aryl group
- X 1 and X 2 are each independently a hydrogen atom.
- R 1 represents a hydrogen atom or a substituent
- R 2 represents a heterocyclic group
- n represents an integer of 1 to 4.
- n 2 Represents a dimer via Q, W, X 1 , X 2 , R 1 , or R 2.
- Q, W, X 1 , X 2 , R 1 , R 2 represent a monovalent group and represent a mono-type azo pigment shown in parentheses.
- Q, W, X 1 , X 2 , R 1 and R 2 represent a monovalent or divalent group. However, at least one represents a divalent group and represents a bis-type azo pigment of a dye shown in parentheses.
- Q, W, X 1 , X 2 , R 1 and R 2 represent a monovalent, divalent or trivalent group. However, at least two represent a divalent substituent, or at least one represents a trivalent group, and represents a tris-type azo pigment of a dye shown in parentheses.
- Q, W, X 1 , X 2 , R 1 and R 2 represent a monovalent, divalent or trivalent group. However, at least two represent a divalent substituent, at least one represents a trivalent group, or at least one represents a tetravalent group, and represents a tetra-type azo pigment of a dye indicated in parentheses.
- N is preferably an integer of 1 to 3, more preferably 1 or 2, and most preferably 2 among them.
- X 1 and X 2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkylsulfonyl group or an arylsulfonyl group.
- Examples of the alkyl group represented by X 1 and X 2 include independently a linear, branched, or cyclic substituted or unsubstituted alkyl group, and a cycloalkyl group, a bicycloalkyl group, and a tricyclo structure having many ring structures. Etc. are also included.
- An alkyl group (for example, an alkyl group of an alkoxy group, an alkylcarbonyl group, or an alkylsulfonyl group) in the substituents described below also represents such an alkyl group.
- the alkyl group is preferably an alkyl group having 1 to 30 carbon atoms, preferably 1 to 8 carbon atoms, for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a t-butyl group.
- the cycloalkyl group is preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms.
- bicycloalkyl group is preferably a substituted or unsubstituted bicycloalkyl group having 5 to 30 carbon atoms, that is, a carbon number A monovalent group obtained by removing one hydrogen atom from 5 to 30 bicycloalkane, for example, bicyclo [1,2,2] heptane 2-yl group, a bicyclo [2,2,2] octan-3-yl group.
- Preferred examples of the acyl group represented by X 1 and X 2 include, independently, a formyl group, a substituted or unsubstituted alkylcarbonyl group having 2 to 30 carbon atoms, and a substituted or unsubstituted arylcarbonyl group having 7 to 30 carbon atoms.
- Examples include acetyl group, pivaloyl group, 2-chloroacetyl group, stearoyl group, benzoyl group, pn-octyloxyphenylcarbonyl group, 2-pyridylcarbonyl group, 2-furylcarbonyl group and the like.
- alkylsulfonyl group or arylsulfonyl group represented by X 1 and X 2 each independently represents a substituted or unsubstituted alkylsulfonyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylsulfonyl group having 6 to 30 carbon atoms.
- a substituted or unsubstituted alkylsulfonyl group having 1 to 8 carbon atoms and a substituted or unsubstituted arylsulfonyl group having 6 to 18 carbon atoms are preferable.
- Examples thereof include a methylsulfonyl group, an ethylsulfonyl group, a phenylsulfonyl group, a p-methylphenylsulfonyl group, and the like.
- X 1 and X 2 are each independently a hydrogen atom, an acyl group, or an alkylsulfonyl group, particularly preferably a hydrogen atom, and among them, both X 1 and X 2 are particularly hydrogen atoms. Most preferred. When at least one or both of X 1 and X 2 are hydrogen atoms, the dye molecules easily form hydrogen bonds in the molecule and between the molecules, and it becomes easy to form a pigment having a more stable molecular arrangement. Thereby, a better hue and higher fastness (for example, light resistance, gas resistance, heat resistance, water resistance, chemical resistance, etc.) are achieved.
- W represents an alkoxy group, an amino group, an alkyl group or an aryl group.
- the alkoxy group represented by W is preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, and particularly preferably a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms.
- Examples include methoxy group, ethoxy group, i-propoxy group, t-butoxy group, n-octyloxy group, 2-methoxyethoxy group and the like.
- the amino group represented by W includes an alkylamino group, an arylamino group, and a heterocyclic amino group, preferably an amino group, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, and 6 to carbon atoms.
- 30 substituted or unsubstituted anilino groups are preferable, among which an amino group, a substituted or unsubstituted alkylamino group having 1 to 8 carbon atoms, and a substituted or unsubstituted anilino group having 6 to 18 carbon atoms are preferable.
- an amino group, a substituted or unsubstituted alkylamino group having 1 to 4 carbon atoms, and a substituted or unsubstituted anilino group having 6 to 12 carbon atoms are preferable.
- Examples thereof include a methylamino group, a dimethylamino group, an anilino group, an N-methyl-anilino group, a diphenylamino group and the like.
- Examples of the alkyl group represented by W include linear, branched, and cyclic substituted or unsubstituted alkyl groups, and include cycloalkyl groups, bicycloalkyl groups, and tricyclo structures having many ring structures. .
- An alkyl group (for example, an alkyl group of an alkoxy group or an alkylthio group) in a substituent described below also represents such an alkyl group.
- the alkyl group is preferably an alkyl group having 1 to 30 carbon atoms, such as a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s -Butyl group, t-butyl group, n-octyl group, eicosyl group, 2-chloroethyl group, 2-cyanoethyl group, 2-ethylhexyl group and the like.
- the cycloalkyl group preferably has 3 to 30 carbon atoms.
- Substituted or unsubstituted cycloalkyl groups such as cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group, etc.
- the bicycloalkyl group is preferably a substituted or unsubstituted group having 5 to 30 carbon atoms.
- Bicycloalkyl group that is, a monovalent group obtained by removing one hydrogen atom from a bicycloalkane having 5 to 30 carbon atoms, for example, bicyclo 1,2,2] heptan-2-yl group, a bicyclo [2,2,2] octan-3-yl group.
- the aryl group represented by W is preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, such as a phenyl group, p-tolyl group, naphthyl group, m-chlorophenyl group, o-hexadecanoyl.
- An aminophenyl group etc. are mentioned.
- Preferred examples include substituted or unsubstituted aryl groups having 6 to 30 carbon atoms. Among them, substituted or unsubstituted aryl groups having 6 to 18 carbon atoms are preferable, and further substituted or unsubstituted groups having 6 to 12 carbon atoms are preferable.
- Aryl groups such as phenyl group, p-tolyl group, naphthyl group, m-chlorophenyl group, o-hexadecanoylaminophenyl group and the like are preferable.
- W represents an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethylamino group, anilino group), alkyl group ( For example, a methyl group, ethyl group, n-propyl group, i-propyl group, t-butyl group, cyclopropyl group) or aryl group (for example, phenyl group, p-tolyl group, naphthyl group) is preferable.
- Group, amino group, phenyl group or alkyl group are preferred, and alkoxy group and amino group are more preferred.
- an alkoxy group having a total carbon number of 5 or less an amino group (—NH 2 group), and an alkylamino group having a total carbon number of 5 or less.
- W is an alkoxy group having 5 or less total carbon atoms, an amino group, or an alkylamino group having 5 or less total carbon atoms
- the dye molecule can easily form a hydrogen bond at least in one molecule or between molecules. It is preferable in terms of hue and high fastness (for example, light resistance, gas resistance, heat resistance, water resistance, chemical resistance, etc.).
- an alkoxy group having 3 or less carbon atoms Particularly preferred from the viewpoint of hue, light fastness and solvent resistance are an alkoxy group having 3 or less carbon atoms, an amino group (—NH 2 group), and an alkylamino group having 3 or less carbon atoms.
- a group (—OCH 3 group) or an ethoxy group (—OC 2 H 5 group) is preferred, and a methoxy group is most preferred from the viewpoint of good hue and improved light fastness.
- R 1 represents a hydrogen atom or a substituent
- the substituent may be a linear or branched alkyl group having 1 to 12 carbon atoms, 7 to 7 carbon atoms, 18 straight or branched aralkyl groups, 2 to 12 carbon straight chain or branched alkenyl groups, 2 to 12 carbon straight or branched alkynyl groups, 3 to 12 carbon straight or branched cyclo
- R 1 is a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, a substituted or unsubstituted total carbon number A 6-18 aryl group, or a substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms, more preferably a linear or branched alkyl group having 1 to 8 carbon atoms, and methyl Group, i-propyl group or t-butyl group is preferable, i-propyl group or t-butyl group is particularly preferable, and t-butyl group is particularly preferable among them.
- R 1 By making R 1 a straight-chain alkyl group or branched alkyl group having a small total carbon number (for example, 1 to 4 carbon atoms), it is possible to achieve better hue, tinting strength, and image fastness.
- R 2 represents a heterocyclic group, which may be further condensed.
- R 2 is preferably a 5- to 8-membered heterocyclic group, more preferably a 5- or 6-membered substituted or unsubstituted heterocyclic group, and particularly preferably a 6-membered nitrogen-containing heterocycle having 3 to 10 carbon atoms. It is a cyclic group.
- heterocyclic group represented by R 2 examples include, but are not limited to, the substitution position. Furyl, benzofuryl, thienyl, benzothienyl, pyrazolyl, imidazolyl, benzimidazolyl, triazolyl, oxazolyl, benzoxazolyl, thiazolyl, benzothiazolyl, isothiazolyl, benzisothiazolyl, thiadiazolyl, isoxazolyl, benzisoxazolyl, pyrrolidinyl, piperidinyl, Examples include piperazinyl, imidazolidinyl, thiazolinyl, sulfolanyl and the like.
- heterocyclic groups are pyridyl, pyrimidinyl, S-triazinyl, pyridazinyl, pyrazinyl, 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, imidazolyl, more preferably pyridyl, pyrimidinyl, S— Triazinyl, pyridazinyl, and pyrazinyl.
- Pyrimidinyl and S-triazinyl are particularly preferred from the viewpoint of hue, tinting strength, and image fastness.
- pyrimidinyl having a substituent at 4,6- and having 1 to 4 carbon atoms at the 2-position S-triazinyl having an alkoxy group is preferable from the viewpoint of hue and image fastness, and among them, pyrimidinyl having a substituent at 4,6- is most preferable from the viewpoint of good hue and improving light fastness.
- Q represents a 5- to 7-membered heterocycle together with the carbon atom, and an aliphatic ring, an aromatic ring, or another heterocycle may be condensed to the heterocycle.
- Examples of the 5- to 7-membered heterocycle formed by Q together with the carbon atom include thienyl, furyl, pyrrolyl, indolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazinyl Group, pyridyl group, pyrazinyl group, pyridazinyl group and the like. Each heterocyclic group may further have a substituent.
- the 5- to 7-membered heterocycle represented by Q together with the carbon atom is preferably a 5-membered nitrogen-containing heterocycle, particularly preferably a heterocycle represented by the following general formulas (a) to (j).
- a heterocycle represented by the following general formulas (a) to (j) are preferable, and a heterocyclic ring represented by (a), (b), (c), (e), or (j) is preferable.
- a) and (a) is most preferred from the viewpoints of hue, tinting strength and image fastness.
- “*” represents the bonding position with the azo group in the general formula (1).
- Ra represents a hydrogen atom or a substituent
- Rb and Rc each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl Represents a group or a heterocyclic group.
- W is synonymous with W in the general formula (1), and preferred ones are also the same.
- W represents an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethylamino group, anilino group), alkyl group ( For example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a t-butyl group, a cyclopropyl group) or an aryl group (for example, a phenyl group, a p-tolyl group, a naphthyl group) is preferable.
- alkoxy group eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group
- amino group eg, —NH 2 group, methylamino group, dimethylamino group, anilino group
- alkyl group For example, a methyl group, an e
- an amino group or an alkyl group is preferable, and an alkoxy group or an amino group is more preferable. More preferred are an alkoxy group having a total carbon number of 5 or less, an amino group (—NH 2 group), and an alkylamino group having a total carbon number of 5 or less.
- W is an alkoxy group having 5 or less carbon atoms, an amino group, or an alkylamino group having 5 or less carbon atoms, it is preferable in terms of good hue and high fastness (light resistance / gas / heat / water / chemical).
- an alkoxy group having 3 or less carbon atoms Particularly preferred from the viewpoint of hue, light fastness and solvent resistance are an alkoxy group having 3 or less carbon atoms, an amino group (—NH 2 group), and an alkylamino group having 3 or less carbon atoms.
- a group (—OCH 3 group), an ethoxy group (—OC 2 H 5 group), or an amino group is preferable, and a methoxy group is most preferable from the viewpoint of good hue and improved light fastness.
- Ra is preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted total carbon number of 4 to 12
- a heterocyclic group more preferably a hydrogen atom, a linear alkyl group having 1 to 8 carbon atoms and / or a branched alkyl group, and particularly preferably a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms.
- a hydrogen atom and a methyl group are preferable from the viewpoint of hue and image fastness, and among them, a hydrogen atom is most preferable from the viewpoint of good hue and improvement of light fastness.
- Rb and Rc are preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl 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, or a substituted or unsubstituted heterocyclic group more preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group
- an alkyl group having a total carbon number of 3 or less is preferable from the viewpoint of hue and image fastness, and a methyl group is most preferable from the viewpoint of good hue and improvement of light fastness.
- substituent J examples of the substituent in the case where Q, W, X 1 , X 2 , R 1 and R 2 further have a substituent include the following substituents (hereinafter sometimes referred to as “substituent J”). it can.
- halogen atom alkyl group, aralkyl group, alkenyl group, alkynyl group, aryl group, heterocyclic group, cyano group, hydroxyl group, nitro group, alkoxy group, aryloxy group, silyloxy group, heterocyclic oxy group, acyloxy group , Carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfamoylamino group, alkyl or arylsulfonylamino group , Mercapto group, alkylthio group, arylthio group, heterocyclic thio group, sulfamoyl group, alkyl or arylsulfinyl group, alkyl or arylsulfonyl group, acyloxy group
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- alkyl group examples include linear, branched, and cyclic substituted or unsubstituted alkyl groups, and include cycloalkyl groups, bicycloalkyl groups, and tricyclo structures having many ring structures.
- An alkyl group (for example, an alkyl group of an alkoxy group or an alkylthio group) in a substituent described below also represents such an alkyl group.
- the alkyl group is preferably an alkyl group having 1 to 30 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an iso i-propyl group, a t-butyl group, an n-octyl group, An eicosyl group, a 2-chloroethyl group, a 2-cyanoethyl group, a 2-ethylhexyl group and the like.
- the cycloalkyl group is preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, such as a cyclohexyl group.
- Cyclopentyl group, 4-n-dodecylcyclohexyl group, etc., and the bicycloalkyl group is preferably a substituted or unsubstituted bicycloalkyl group having 5 to 30 carbon atoms, that is, a bicycloalkane having 5 to 30 carbon atoms.
- aralkyl group examples include a substituted or unsubstituted aralkyl group, and the substituted or unsubstituted aralkyl group is preferably an aralkyl group having 7 to 30 carbon atoms. Examples thereof include a benzyl group and a 2-phenethyl group.
- alkenyl group examples include linear, branched, and cyclic substituted or unsubstituted alkenyl groups, and include cycloalkenyl groups and bicycloalkenyl groups.
- the alkenyl group is preferably a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, such as a vinyl group, an allyl group, a prenyl group, a geranyl group, an oleyl group, and the like.
- bicycloalkenyl group a substituted or unsubstituted bicycloalkenyl group, preferably a substituted or unsubstituted bicycloalkenyl group having 5 to 30 carbon atoms, That is, a monovalent group obtained by removing one hydrogen atom of a bicycloalkene having one double bond, for example, bicyclo [2 2,1] hept-2-en-1-yl group, a bicyclo [2,2,2] oct-2-en-4-yl group and the like.
- the alkynyl group is preferably a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, such as an ethynyl group, a propargyl group, a trimethylsilylethynyl group, and the like.
- the aryl group is preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, such as a phenyl group, a p-tolyl group, a naphthyl group, an m-chlorophenyl group, an o-hexadecanoylaminophenyl group, and the like. Can be mentioned.
- the heterocyclic group is preferably 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 more preferably a carbon number.
- Examples thereof include 3 to 30 5- or 6-membered aromatic heterocyclic groups such as a 2-furyl group, a 2-thienyl group, a 2-pyrimidinyl group, and a 2-benzothiazolyl group.
- the alkoxy group is preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, such as a methoxy group, an ethoxy group, an isopropoxy group, a t-butoxy group, an n-octyloxy group, or a 2-methoxyethoxy group. Etc.
- the aryloxy group is preferably a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, such as a phenoxy group, 2-methylphenoxy group, 4-t-butylphenoxy group, 3-nitrophenoxy group, 2 -Tetradecanoylaminophenoxy group and the like.
- silyloxy group examples include substituted or unsubstituted silyloxy groups having 0 to 20 carbon atoms, such as trimethylsilyloxy group and diphenylmethylsilyloxy group.
- the heterocyclic oxy group is preferably a substituted or unsubstituted heterocyclic oxy group having 2 to 30 carbon atoms, such as a 1-phenyltetrazol-5-oxy group and a 2-tetrahydropyranyloxy group.
- the acyloxy group is preferably a formyloxy group, a substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, a substituted or unsubstituted arylcarbonyloxy group having 6 to 30 carbon atoms, such as an acetyloxy group, Examples include 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, such as N, N-dimethylcarbamoyloxy group, N, N-diethylcarbamoyloxy group, morpholinocarbonyloxy group, N , N-di-n-octylaminocarbonyloxy group, Nn-octylcarbamoyloxy group and the like.
- the alkoxycarbonyloxy group is preferably a substituted or unsubstituted alkoxycarbonyloxy group having 2 to 30 carbon atoms, such as a methoxycarbonyloxy group, an ethoxycarbonyloxy group, a t-butoxycarbonyloxy group, or an n-octylcarbonyloxy group. Etc.
- aryloxycarbonyloxy group a substituted or unsubstituted aryloxycarbonyloxy group having 7 to 30 carbon atoms such as phenoxycarbonyloxy group, p-methoxyphenoxycarbonyloxy group, pn-hexadecyloxy is preferable. Examples include phenoxycarbonyloxy group.
- the amino group includes an alkylamino group, an arylamino group, and a heterocyclic amino group, preferably an amino group, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted group having 6 to 30 carbon atoms.
- the substituted anilino group include a methylamino group, a dimethylamino group, an anilino group, an N-methyl-anilino group, and a diphenylamino group.
- the acylamino group is preferably a formylamino group, a substituted or unsubstituted alkylcarbonylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylcarbonylamino group having 6 to 30 carbon atoms, such as an acetylamino group, Examples include 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, such as a carbamoylamino group, N, N-dimethylaminocarbonylamino group, N, N-diethylaminocarbonylamino group. And a morpholinocarbonylamino group.
- the alkoxycarbonylamino group is preferably a substituted or unsubstituted alkoxycarbonylamino group having 2 to 30 carbon atoms, such as a methoxycarbonylamino group, an ethoxycarbonylamino group, a t-butoxycarbonylamino group, or an n-octadecyloxycarbonylamino group. Group, N-methyl-methoxycarbonylamino group and the like.
- the aryloxycarbonylamino group is preferably a substituted or unsubstituted aryloxycarbonylamino group having 7 to 30 carbon atoms, such as phenoxycarbonylamino group, p-chlorophenoxycarbonylamino group, mn-octyloxyphenoxy. Examples thereof include a carbonylamino group.
- the sulfamoylamino group is preferably a substituted or unsubstituted sulfamoylamino group having 0 to 30 carbon atoms, such as a sulfamoylamino group, N, N-dimethylaminosulfonylamino group, Nn- Examples include octylaminosulfonylamino group.
- the alkyl or arylsulfonylamino group is preferably a substituted or unsubstituted alkylsulfonylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfonylamino group having 6 to 30 carbon atoms, such as a methylsulfonylamino group.
- the alkylthio group is preferably a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, such as 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, such as a phenylthio group, a p-chlorophenylthio group, and an m-methoxyphenylthio group.
- heterocyclic thio group examples include substituted or unsubstituted heterocyclic thio groups having 2 to 30 carbon atoms, such as 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, such as N-ethylsulfamoyl group, N- (3-dodecyloxypropyl) sulfamoyl group, N, N-dimethylsulfuryl group.
- Examples include a famoyl group, an N-acetylsulfamoyl group, an N-benzoylsulfamoyl group, and an N- (N′-phenylcarbamoyl) sulfamoyl group.
- the alkyl or arylsulfinyl group is preferably a substituted or unsubstituted alkylsulfinyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfinyl group having 6 to 30 carbon atoms, such as a methylsulfinyl group, an ethylsulfinyl group, phenyl. Examples thereof include a sulfinyl group and a p-methylphenylsulfinyl group.
- the alkyl or arylsulfonyl group is preferably a substituted or unsubstituted alkylsulfonyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfonyl group having 6 to 30 carbon atoms, such as a methylsulfonyl group, an ethylsulfonyl group, or a phenyl group. Examples thereof include a sulfonyl group and a p-methylphenylsulfonyl 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, a substituted or unsubstituted group having 2 to 30 carbon atoms.
- Heterocyclic carbonyl groups bonded to carbonyl groups at substituted carbon atoms eg, acetyl, pivaloyl, 2-chloroacetyl, stearoyl, benzoyl, pn-octyloxyphenylcarbonyl, 2-pyridyl
- Examples thereof include a carbonyl group and a 2-furylcarbonyl group.
- the aryloxycarbonyl group is preferably a substituted or unsubstituted aryloxycarbonyl group having 7 to 30 carbon atoms, such as a phenoxycarbonyl group, an o-chlorophenoxycarbonyl group, an m-nitrophenoxycarbonyl group, pt- A butylphenoxycarbonyl group etc. are mentioned.
- the alkoxycarbonyl group is preferably a substituted or unsubstituted alkoxycarbonyl group having 2 to 30 carbon atoms, such as 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, such as a carbamoyl group, an N-methylcarbamoyl group, an N, N-dimethylcarbamoyl group, or an N, N-di-n-octyl group.
- a carbamoyl group, an N- (methylsulfonyl) carbamoyl group, and the like can be given.
- the aryl or heterocyclic azo group is preferably a substituted or unsubstituted arylazo group having 6 to 30 carbon atoms, a substituted or unsubstituted heterocyclic azo group having 3 to 30 carbon atoms, such as phenylazo, p-chlorophenylazo, 5-ethylthio-1,3,4-thiadiazol-2-ylazo and the like.
- Preferred examples of the imide group include an N-succinimide group and an N-phthalimide group.
- the phosphino group is preferably a substituted or unsubstituted phosphino group having 0 to 30 carbon atoms, such as a dimethylphosphino group, a diphenylphosphino group, a methylphenoxyphosphino group, and the like.
- the phosphinyl group is preferably a substituted or unsubstituted phosphinyl group having 0 to 30 carbon atoms, such as a phosphinyl group, a dioctyloxyphosphinyl group, a diethoxyphosphinyl group, and the like.
- the phosphinyloxy group is preferably a substituted or unsubstituted phosphinyloxy group having 0 to 30 carbon atoms, such as a diphenoxyphosphinyloxy group and a dioctyloxyphosphinyloxy group.
- the phosphinylamino group is preferably a substituted or unsubstituted phosphinylamino group having 0 to 30 carbon atoms, such as a dimethoxyphosphinylamino group or a dimethylaminophosphinylamino group.
- silyl group examples include substituted or unsubstituted silyl groups having 0 to 30 carbon atoms, such as a trimethylsilyl group, a t-butyldimethylsilyl group, and a phenyldimethylsilyl group.
- substituents those having a hydrogen atom may be substituted with the above substituent.
- substituents include an alkylcarbonylaminosulfonyl group, an arylcarbonylaminosulfonyl group, an alkylsulfonylaminocarbonyl group, and an arylsulfonylaminocarbonyl group.
- substituents include a methylsulfonylaminocarbonyl group, a p-methylphenylsulfonylaminocarbonyl group, an acetylaminosulfonyl group, and a benzoylaminosulfonyl group.
- a compound in which at least one of various substituents is the above preferred group is preferred, and more various substituents are preferred. More preferred are compounds that are groups, and most preferred are compounds in which all substituents are the preferred groups.
- a particularly preferred combination as the azo pigment represented by the general formula (1) of the present invention includes the following (A) to (F).
- X 1 and X 2 are each independently a hydrogen atom, an alkyl group (for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a t-butyl group, a cyclopropyl group), an acyl group (for example, , A formyl group, an acetyl group, a pivaloyl group, a benzoyl group), an alkylsulfonyl group (for example, a methylsulfonyl group or an ethylsulfonyl group), and an arylsulfonyl group (for example, a phenylsulfonyl group), among which a hydrogen atom and an acetyl group are preferable.
- a methylsulfonyl group is preferable, and a hydrogen atom is particularly preferable. Among them, it is most preferable that both X 1 and X 2
- (B) W represents an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethylamino group, anilino group),
- An alkyl group for example, methyl group, ethyl group, n-propyl group, i-propyl group, t-butyl group, cyclopropyl group
- aryl group for example, phenyl group, p-tolyl group, naphthyl group
- an alkoxy group, an amino group or an alkyl group is preferable, and an alkoxy group or an amino group is more preferable.
- an alkoxy group having a total carbon number of 5 or less an amino group (—NH 2 group), and an alkylamino group having a total carbon number of 5 or less.
- W is an alkoxy group having 5 or less carbon atoms, an amino group, or an alkylamino group having 5 or less carbon atoms
- it is preferable in terms of good hue and high fastness light resistance / gas / heat / water / chemical.
- Particularly preferred from the viewpoint of hue, light fastness and solvent resistance are an alkoxy group having 3 or less carbon atoms, an amino group (—NH 2 group), and an alkylamino group having 3 or less carbon atoms.
- a group (—OCH 3 group) or an ethoxy group (—OC 2 H 5 group) is preferred, and a methoxy group is most preferred from the viewpoint of good hue and improved light fastness.
- R 1 is a hydrogen atom or a substituent (for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or 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.
- a substituent for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted heterocyclic group having 4 to 12
- R 2 represents a heterocyclic group, which may be further condensed.
- R 2 is preferably a 5- to 8-membered heterocyclic group, more preferably a 5- or 6-membered substituted or unsubstituted heterocyclic group, and particularly preferably a 6-membered nitrogen-containing heterocycle having 3 to 10 carbon atoms. It is a cyclic group.
- Examples of more preferred heterocycles are pyridine ring, pyrimidine ring, S-triazine ring, pyridazine ring, pyrazine ring, 1,2,4 thiadiazole ring, 1,3,4 thiadiazole ring, imidazole ring, more preferably A pyridine ring, a pyrimidine ring, an S-triazine ring, a pyridazine ring and a pyrazine ring are preferable, and a pyrimidine ring and an S-triazine ring are particularly preferable, and among them, a pyrimidine ring is most preferable.
- (E) Q represents a 5- to 7-membered heterocycle together with the carbon atom, and the heterocycle may be condensed with an aliphatic ring, an aromatic ring, or another heterocycle.
- Particularly preferred examples of the 5- to 7-membered heterocycle formed by Q together with carbon atoms include thienyl, furyl, pyrrolyl, indolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, and isoxazolyl groups. , Triazinyl group, pyridyl group, pyrazinyl group, pyridazinyl group and the like. Each heterocyclic group may further have a substituent.
- the 5- to 7-membered heterocycle formed by Q together with the carbon atom is preferably a 5-membered nitrogen-containing heterocycle, particularly preferably a heterocycle represented by the following general formulas (a) to (j): Most preferred.
- Ra represents a hydrogen atom or a substituent
- Rb and Rc each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl Represents a group or a heterocyclic group.
- W is synonymous with W in the general formula (1), and preferred ones are also the same.
- Ra is preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted total carbon number of 4 to 12
- a heterocyclic group more preferably a hydrogen atom, a linear alkyl group having 1 to 8 carbon atoms and / or a branched alkyl group, and particularly preferably a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms.
- Rb and Rc are preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl 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, or a substituted or unsubstituted heterocyclic group more preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group
- Particularly preferred is an alkyl group having a total carbon number of 5 or less, more preferred is an alkyl group having a total carbon number of 3 or less, and a methyl group is most preferred among them.
- the 5-membered heterocycle represented by Q together with the carbon atom is preferably a 5-membered nitrogen-containing heterocycle, and most preferably heterocycles represented by the following general formulas (a) to (j).
- (a) to (f) or (j) are preferable, (a), (b), (c), (e), (j) are more preferable, (a), (c) are particularly preferable, (a ) Is most preferable in terms of hue, tinting strength and image fastness.
- the azo pigment represented by the general formula (1) is preferably an azo pigment represented by the following general formula (2).
- Examples of X 1 are the same as examples of X 1 in the general formula (1), and preferred examples are also the same.
- R 1, R 2 are the same as examples of R 1, R 2 each independently of the above general formula (1), and preferred examples are also the same.
- n is synonymous with the example of n in the said General formula (1), and its preferable example is also the same.
- a compound in which at least one of various substituents is the above-mentioned preferred group is preferred, and more various substituents are preferred. More preferred are compounds that are groups, and most preferred are compounds in which all substituents are the preferred groups.
- a particularly preferred combination as the azo pigment represented by the general formula (2) of the present invention includes the following (A) to (F).
- X 1 is a hydrogen atom, an alkyl group (for example, methyl group, ethyl group, n-propyl group, iso-i-propyl group, t-butyl group, cyclopropyl group), acyl group (for example, formyl group, acetyl group) Group, pivaloyl group, benzoyl group), alkylsulfonyl group (for example, methylsulfonyl group or ethylsulfonyl group), and arylsulfonyl group (for example, phenylsulfonyl group) are preferable.
- a hydrogen atom, an acetyl group, and a methylsulfonyl group are preferable.
- it is a hydrogen atom.
- (B) W represents an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethylamino group, anilino group),
- An alkyl group for example, methyl group, ethyl group, n-propyl group, i-propyl group, t-butyl group, cyclopropyl group
- aryl group for example, phenyl group, p-tolyl group, naphthyl group
- an alkoxy group, an amino group or an alkyl group is preferable, and an alkoxy group or an amino group is more preferable.
- an alkoxy group having a total carbon number of 5 or less an amino group (—NH 2 group), and an alkylamino group having a total carbon number of 5 or less.
- W is an alkoxy group having 5 or less carbon atoms, an amino group, or an alkylamino group having 5 or less carbon atoms
- it is preferable in terms of good hue and high fastness light resistance / gas / heat / water / chemical.
- Particularly preferred from the viewpoint of hue, light fastness and solvent resistance are an alkoxy group having 3 or less carbon atoms, an amino group (—NH 2 group), and an alkylamino group having 3 or less carbon atoms.
- a group (—OCH 3 group) or an ethoxy group (—OC 2 H 5 group) is preferred, and a methoxy group is most preferred from the viewpoint of good hue and improved light fastness.
- R 1 is a hydrogen atom or a substituent (for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or 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.
- a substituent for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted heterocyclic group having 4 to 12
- R 2 represents a heterocyclic group, which may be further condensed.
- R 2 is preferably a 5- to 8-membered heterocyclic group, more preferably a 5- or 6-membered substituted or unsubstituted heterocyclic group, and particularly preferably a 6-membered nitrogen-containing heterocycle having 3 to 10 carbon atoms. It is a cyclic group.
- Examples of more preferred heterocycles are pyridine ring, pyrimidine ring, S-triazine ring, pyridazine ring, pyrazine ring, 1,2,4 thiadiazole ring, 1,3,4 thiadiazole ring, imidazole ring, more preferably A pyridine ring, a pyrimidine ring, an S-triazine ring, a pyridazine ring and a pyrazine ring are preferable, and a pyrimidine ring and an S-triazine ring are particularly preferable, and among them, a pyrimidine ring is most preferable.
- (E) Q represents a 5- to 7-membered heterocycle together with the carbon atom, and the heterocycle may be condensed with an aliphatic ring, an aromatic ring, or another heterocycle.
- Particularly preferred examples of the 5- to 7-membered heterocycle formed by Q together with carbon atoms include thienyl, furyl, pyrrolyl, indolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, and isoxazolyl groups. , Triazinyl group, pyridyl group, pyrazinyl group, pyridazinyl group and the like. Each heterocyclic group may further have a substituent.
- the 5- to 7-membered heterocycle formed by Q together with the carbon atom is preferably a 5-membered nitrogen-containing heterocycle, particularly preferably a heterocycle represented by the following general formulas (a) to (j): Most preferred.
- Ra represents a hydrogen atom or a substituent
- Rb and Rc each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, a group Represents an aryl group or a heterocyclic group.
- W is synonymous with W in the general formula (1), and preferred ones are also the same.
- Ra is preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted total carbon number of 4 to 12
- a heterocyclic group more preferably a hydrogen atom, a linear alkyl group having 1 to 8 carbon atoms and / or a branched alkyl group, and particularly preferably a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms.
- Rb and Rc are preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl 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, or a substituted or unsubstituted heterocyclic group more preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group
- Particularly preferred is an alkyl group having a total carbon number of 5 or less, more preferred is an alkyl group having a total carbon number of 3 or less, and a methyl group is most preferred among them.
- the 5-membered heterocycle represented by Q together with the carbon atom is preferably a 5-membered nitrogen-containing heterocycle, and most preferably heterocycles represented by the following general formulas (a) to (j).
- (a) to (f) or (j) are preferable, (a), (b), (c), (e), (j) are more preferable, (a), (c) are particularly preferable, (a ) Is most preferable in terms of hue, tinting strength and image fastness.
- the above general formulas (a), (b), and (c) are particularly preferred as the 5-membered heterocycle formed by Q together with the carbon atom, and of these, the general formula (a) is most preferred.
- the present invention includes tautomers of the azo pigments represented by the general formulas (1) and (2).
- the general formulas (1) and (2) are shown in the form of an extreme structural formula among several tautomers that can be taken in terms of chemical structure, but are tautomers other than the described structures. Alternatively, it may be used as a mixture containing a plurality of tautomers.
- the pigment represented by the general formula (2) may be an azo-hydrazone tautomer represented by the following general formula (2 ').
- the present invention includes in its scope a compound represented by the following general formula (2 '), which is a tautomer of the azo pigment represented by the general formula (2).
- the azo pigment represented by the general formula (1) is preferably an azo pigment represented by the following general formula (3).
- Y in general formula (3) represents a hydrogen atom or a substituent
- G represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group
- W, X 1 , X 2 , R 1 , R 2 and n are the same as W, X 1 , X 2 , R 1 , R 2 and n in the general formula (1).
- Examples of X 1, X 2 are the same as each independently of X 1, X 2 in the general formula (1) in Example, and preferred examples are also the same.
- R 1, R 2 are the same as examples of R 1, R 2 each independently of the above general formula (1), and preferred examples are also the same.
- n is synonymous with the example of n in the said General formula (1), and its preferable example is also the same.
- G represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, and particularly preferably a hydrogen atom, a methyl group, an ethyl group, or an n-propyl group.
- I-propyl group, t-butyl group, cyclopropyl group, benzyl group, 2-phenethyl group, vinyl group, allyl group, ethynyl group, propargyl group, phenyl group, p-tolyl group, naphthyl group, pyridyl group, pyrimidinyl Group, and a pyrazinyl group are preferable, and a hydrogen atom, a methyl group, a phenyl group, a pyridyl group, a pyrimidinyl group, and a pyrazinyl group are preferable.
- a methyl group, a 2-pyridyl group, a 2,6-pyrimidinyl group, and a 2,5-pyrazinyl group are preferable.
- Y represents a substituent
- Y represents a substituent
- halogen atom alkyl group, aralkyl group, alkenyl group, alkynyl group, aryl group, heterocyclic group, cyano group, hydroxyl group, nitro group, alkoxy group, aryloxy group, silyloxy Group, heterocyclic oxy group, acyloxy group, carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfamoyl Amino group, alkyl or arylsulfonylamino group, mercapto group, alkylthio group, arylthio group, heterocyclic thio group, sulfamoyl group, alkyl or arylsulfinyl group, alkyl
- Examples of Y are particularly preferably a hydrogen atom, an alkyl group (for example, a methyl group), an aryl group (for example, a phenyl group), a heterocyclic group (for example, a 2-pyridyl group), and an alkylthio group (for example, a methylthio group). Furthermore, they are a hydrogen atom, a methyl group, a phenyl group, and a methylthio group, and among them, a hydrogen atom is most preferable.
- a compound in which at least one of various substituents is the above preferred group is preferred, and more various substituents are preferred. More preferred are compounds that are groups, and most preferred are compounds in which all substituents are the preferred groups.
- a particularly preferable combination as the azo pigment represented by the general formula (3) of the present invention includes the following (A) to (G).
- X 1 and X 2 are each independently a hydrogen atom, an alkyl group (for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a t-butyl group, a cyclopropyl group), an acyl group (for example, , A formyl group, an acetyl group, a pivaloyl group, a benzoyl group), an alkylsulfonyl group (for example, a methylsulfonyl group or an ethylsulfonyl group), and an arylsulfonyl group (for example, a phenylsulfonyl group), among which a hydrogen atom and an acetyl group are preferable.
- an alkyl group for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a
- a methylsulfonyl group is preferable, and a hydrogen atom is particularly preferable.
- at least one of X 1 and X 2 is more preferably a hydrogen atom, and most preferably both are hydrogen atoms.
- X 1 and X 2 is a hydrogen atom, as well as intermolecular interactions of the dye molecules, constitutes a pigment of a more stable molecular arrangement with it easily firmly formed intramolecular interactions It is easy to use and preferable in terms of good hue and high fastness (light resistance, gas, heat, water, chemicals).
- (B) W represents an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethylamino group, anilino group),
- An alkyl group for example, methyl group, ethyl group, n-propyl group, i-propyl group, t-butyl group, cyclopropyl group
- aryl group for example, phenyl group, p-tolyl group, naphthyl group
- an alkoxy group, an amino group or an alkyl group is preferable, and an alkoxy group or an amino group is more preferable.
- an alkoxy group having a total carbon number of 5 or less an amino group (—NH 2 group), and an alkylamino group having a total carbon number of 5 or less.
- W is an alkoxy group having 5 or less carbon atoms, an amino group, or an alkylamino group having 5 or less carbon atoms
- it is preferable in terms of good hue and high fastness light resistance / gas / heat / water / chemical.
- Particularly preferred from the viewpoint of hue, light fastness and solvent resistance are an alkoxy group having 3 or less carbon atoms, an amino group (—NH 2 group), and an alkylamino group having 3 or less carbon atoms.
- a group (—OCH 3 group) or an ethoxy group (—OC 2 H 5 group) is preferred, and a methoxy group is most preferred from the viewpoint of good hue and improved light fastness.
- R 1 is a hydrogen atom or a substituent (for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or 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.
- a substituent for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms in total, substituted or unsubstituted Of the aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted heterocyclic group having 4 to 12
- R 2 represents a heterocyclic group, which may be further condensed.
- R 2 is preferably a 5- to 8-membered heterocyclic group, more preferably a 5- or 6-membered substituted or unsubstituted heterocyclic group, and particularly preferably a 6-membered nitrogen-containing heterocycle having 3 to 10 carbon atoms. It is a cyclic group.
- Examples of more preferred heterocycles are pyridine ring, pyrimidine ring, S-triazine ring, pyridazine ring, pyrazine ring, 1,2,4 thiadiazole ring, 1,3,4 thiadiazole ring, imidazole ring, more preferably A pyridine ring, a pyrimidine ring, an S-triazine ring, a pyridazine ring and a pyrazine ring are preferable, and a pyrimidine ring and an S-triazine ring are particularly preferable, and among them, a pyrimidine ring is most preferable.
- (E) G preferably represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group having a total carbon number of 12 or less. More preferably, an alkyl group having 6 or less carbon atoms, a cycloalkyl group having 6 or less carbon atoms, an aralkyl group having 12 or less carbon atoms, an alkenyl group having 12 or less carbon atoms, an alkynyl group having 12 or less carbon atoms, An aryl group having 18 or less carbon atoms or a heterocyclic group having 12 or less total carbon atoms is represented.
- a hydrogen atom a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, a t-butyl group, a cyclopropyl group, a benzyl group, a 2-phenethyl group, a vinyl group, an allyl group, an ethynyl group, or It represents a propargyl group, a benzyl group, a 2-phenethyl group, a phenyl group, a p-tolyl group, a naphthyl group, a pyridyl group, a pyrimidinyl group, or a pyrazinyl group.
- a hydrogen atom, a methyl group, a phenyl group, a pyridyl group, a pyrimidinyl group, and a pyrazinyl group are preferable.
- a methyl group, a 2-pyridyl group, a 2,6-pyrimidinyl group, and a 2,5-pyrazinyl group are preferable, and a methyl group Most preferably.
- Y represents a hydrogen atom, an alkyl group (for example, a methyl group), an aryl group (for example, a phenyl group), a heterocyclic group (for example, a 2-pyridyl group), an alkylthio group (for example, a methylthio group), and a hydrogen atom
- an alkyl group for example, a methyl group
- an aryl group for example, a phenyl group
- a heterocyclic group for example, a 2-pyridyl group
- an alkylthio group for example, a methylthio group
- a hydrogen atom is most preferable.
- n 2 or 3, and particularly preferable is when n is 2.
- n 2 or 3
- the coloring power is high, the light resistance is excellent, and the chemical fastness is improved.
- a tautomer thereof, a salt or a hydrate thereof represents a dimer, for example, the following general formulas (4), (5), (6), (7), ( The connection mode represented by 8) and (9) is mentioned.
- G 1 and G 2 are each independently synonymous with G in the general formula (3).
- R 11 and R 12 are each independently synonymous with R 1 in the general formula (3).
- W 1 and W 2 are each independently synonymous with W in the general formula (3).
- Y 1 and Y 2 are independently the same as Y in the general formula (3).
- Z is synonymous with the case where R 2 in the general formula (3) represents a divalent substituent.
- G 1 and G 2 are each independently synonymous with G in the general formula (3).
- R 11 and R 12 are each independently synonymous with R 1 in the general formula (3).
- W 1 and W 2 are each independently synonymous with W in the general formula (3).
- Z 1 and Z 2 are each independently synonymous with R 2 in the general formula (3).
- Y is synonymous with the case where Y in the general formula (3) represents a divalent substituent.
- G 1 and G 2 are each independently synonymous with G in the general formula (3).
- R 11 and R 12 are each independently synonymous with R 1 in the general formula (3).
- W 1 and W 2 are each independently synonymous with W in the general formula (3).
- Y 1 and Y 2 are independently the same as Y in the general formula (3).
- Z 1 and Z 2 are each independently synonymous with R 2 in the general formula (3).
- X is synonymous with the case where X 1 or X 2 in the general formula (3) represents a divalent substituent.
- G 1 and G 2 are each independently synonymous with G in the general formula (3).
- R 11 and R 12 are each independently synonymous with R 1 in the general formula (3).
- Y 1 and Y 2 are independently the same as Y in the general formula (3).
- Z 1 and Z 2 are each independently synonymous with R 2 in the general formula (3).
- W is synonymous with the case where W in the general formula (3) represents a divalent substituent.
- G 1 and G 2 are each independently synonymous with G in the general formula (3).
- W 1 and W 2 are each independently synonymous with W in the general formula (3).
- Y 1 and Y 2 are independently the same as Y in the general formula (3).
- Z 1 and Z 2 are each independently synonymous with R 1 in the general formula (3).
- R is synonymous with the case where R 1 in the general formula (3) represents a divalent substituent.
- R 11 and R 12 are each independently synonymous with R 1 in the general formula (3).
- W 1 and W 2 are each independently synonymous with W in the general formula (3).
- Y 1 and Y 2 are independently the same as Y in the general formula (3).
- Z 1 and Z 2 are each independently synonymous with R 1 in the general formula (3).
- G is synonymous with the case where G in the general formula (3) represents a divalent substituent.
- the azo pigment represented by the general formula (3) is particularly an azo pigment represented by the general formulas (4), (5), (7), (8) and (9).
- the azo pigments represented by the general formulas (4), (5), (7) and (9) are preferred, and among them, the azo pigments represented by the general formula (4) are particularly preferable. Most preferably it is.
- Z represents a 5- to 8-membered nitrogen-containing heterocycle
- Y 1 , Y 2 , R 11 , R 12 each independently represents a hydrogen atom or a substituent
- G 1 , G 2 are Each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group
- W 1 and W 2 each independently represent an alkoxy group, an amino group, an alkyl group or Represents an aryl group.
- Z represents a divalent 5- to 8-membered nitrogen-containing heterocyclic ring
- preferable heterocyclic groups include, but are not limited to, a pyrrole ring, a pyrazole ring, a triazole ring, an imidazole ring.
- it is a 6-membered nitrogen-containing heterocycle, and examples thereof include a pyridine ring, a pyrimidine ring, and an S-triazine ring.
- Z is particularly preferably a pyrimidine ring.
- Z is a 6-membered nitrogen-containing heterocycle, the intramolecular and intermolecular action of the dye molecule is preferable in terms of easy improvement from the viewpoint of hydrogen bondability and molecular planarity.
- G 1 and G 2 have the same meaning as G in the general formula (2), and preferred examples are also the same.
- R ⁇ 11> , R ⁇ 12 > is synonymous with R ⁇ 1 > in the said General formula (1), and its preferable example is also the same.
- W 1 and W 2 have the same meaning as W in the general formula (1), and preferred examples are also the same.
- the present invention includes within its scope tautomers of the azo pigments represented by the general formula (1).
- the general formula (1) is shown in the form of an ultimate structural formula among several tautomers that can be taken from the chemical structure, but may be a tautomer other than the described structure, You may use as a mixture containing these tautomers.
- the pigment represented by the general formula (4) may be an azo-hydrazone tautomer represented by the following general formula (4 ′).
- the present invention includes in its scope a compound represented by the following general formula (4 ′), which is a tautomer of the azo pigment represented by the general formula (4).
- R 11 , R 12 , W 1 , W 2 , Y 1 , Y 2 , G 1 , G 2 and Z are R 11 , R 12 , W 1 in the general formula (4). , W 2 , Y 1 , Y 2 , G 1 , G 2 and Z.
- the compound whose at least 1 of a various substituent is the said preferable group is preferable, and many more various substituents are the said preferable. More preferred are compounds that are groups, and most preferred are compounds in which all substituents are the preferred groups.
- a particularly preferred combination as the azo pigment represented by the general formula (4) of the present invention includes the following (A) to (E).
- W 1 and W 2 are each independently an alkoxy group (eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group), amino group (eg, —NH 2 group, methylamino group, dimethyl group) Amino group, anilino group), alkyl group (for example, methyl group, ethyl group, n-propyl group, i-propyl group, t-butyl group, cyclopropyl group) or aryl group (for example, phenyl group, p-tolyl group) , A naphthyl group), preferably an alkoxy group, an amino group or an alkyl group, more preferably an alkoxy group or an amino group, more preferably an alkoxy group having 5 or less carbon atoms, an amino group (—NH 2 group).
- alkoxy group eg, methoxy group, ethoxy group, i-propoxy group, t-butoxy group
- R 11 and R 12 are each independently a hydrogen atom or a substituent (for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubstituted alkyl having 1 to 12 carbon atoms in total) Group, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, or a substituted or unsubstituted heterocyclic group having 4 to 12 carbon atoms in total, more preferably a straight chain having 1 to 8 carbon atoms in total. It is an alkyl group or a branched alkyl group, more preferably a methyl group, an i-propyl group, or a tert-butyl group, and most preferably a tert-butyl group.
- a substituent for example, a substituted or unsubstituted acylamino group having 1 to 8 carbon atoms in total, a substituted or unsubsti
- (C) Z represents a divalent heterocyclic group, which may be further condensed.
- Z is preferably a 5- to 8-membered heterocyclic group, more preferably a 5- or 6-membered substituted or unsubstituted heterocyclic ring, such as a pyrrole ring, a pyrazole ring, a triazole ring, an imidazole ring, a thiazole ring, or an isothiazole.
- heterocyclic ring examples include a pyridine ring, a pyrimidine ring, an S-triazine ring, a pyridazine ring and a pyrazine ring, more preferably a pyridine ring, a pyrimidine ring, an S-triazine ring, a pyridazine ring and a pyrazine ring. More preferred are a pyrimidine ring and an S-triazine ring, and among these, a pyrimidine ring is most preferred.
- G 1 and G 2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, and particularly preferably a hydrogen atom or a methyl group.
- a naphthyl group, a pyridyl group, a pyrimidinyl group, and a pyrazinyl group are preferable, and a hydrogen atom, a methyl group, a phenyl group, a pyridyl group, a pyrimidinyl group, and a pyrazinyl group are preferable, and among them, a methyl group, a 2-pyridyl group, and 2,6- A pyrimidinyl group and a 2,5-pyrazinyl group are preferred.
- An alkyl group having 5 or less carbon atoms is more preferable
- Y 1 and Y 2 are each independently a hydrogen atom, an alkyl group (eg, a methyl group), an aryl group (eg, a phenyl group), a heterocyclic group (eg, a 2-pyridyl group), an alkylthio group (eg, a methylthio group)
- an alkylthio group eg, a methylthio group
- n 2 or 3, and particularly preferable is when n is 2.
- n 2 or 3
- the coloring power is high, the light resistance is excellent, and the chemical fastness is improved.
- azo pigments represented by the general formulas (1), (2), (3) and (4) of the present invention azo pigments represented by the following general formulas (10) to (13) are preferable. .
- R 1, R 2, W and Q in the general formula (10) has the same definition as R 1, R 2, W and Q in the general formula (2).
- G in the general formula (11), R 1, R 2, W and Y are as defined above general formula (3) in the G, R 1, R 2, W and Y.
- G 1 , G 2 , R 11 , R 12 , W 1 , W 2 , Y 1 and Y 2 in the general formula (12) are the same as G 1 , G 2 , R 11 , R 12, W 1, W 2 , the same meaning as Y 1 and Y 2.
- X 11 and X 12 each independently represent a heterocycle formed by Z in the above general formula (4); Each represents a heteroatom in the heterocycle of which
- G 1 , G 2 and G 3 are each independently synonymous with G in the general formula (3).
- W 1 , W 2 and W 3 are each independently synonymous with W in the general formula (3).
- Y 1 Y 2 and Y 3 are each independently synonymous with Y in the general formula (3).
- R 11 , R 12 and R 13 are each independently synonymous with R 1 in the general formula (3).
- X 11 , X 12 and X 13 are each independently synonymous with the case where R 2 in the general formula (3) represents a trivalent heterocycle, and Het. Each represents a heteroatom in the heterocycle of which
- the azo pigment represented by the general formula (1) preferably has a substituent that forms an intramolecular hydrogen bond or an intramolecular cross-hydrogen bond. It preferably has at least one substituent that forms an intramolecular hydrogen bond, more preferably has at least three substituents that form an intramolecular hydrogen bond, and at least three intramolecular hydrogens. It is particularly preferred that the group has a substituent that forms a bond, and at least two of these hydrogen bonds have a substituent that forms an intramolecular cross-hydrogen bond.
- examples of particularly preferable azo pigments include the above general formulas (10) to (10). And azo pigments represented by 13).
- this structure is preferable is that a nitrogen atom, a hydrogen atom, and a hetero atom (azo group or a tautomer thereof) constituting the heterocyclic ring contained in the azo pigment structure as shown in the general formulas (10) to (13). It is mentioned that a nitrogen atom of a certain hydrazone group and an oxygen atom of a carbonyl group or a nitrogen atom of an amino group) easily form at least one intramolecular hydrogen bond (intramolecular hydrogen bond).
- Factors in which this structure is preferable include the nitrogen atom constituting the heterocyclic group contained in the azo pigment structure, the hydrogen atom of the amino group, and the hetero atom (azo group or its) as shown in the general formulas (10) and (11).
- the tautomer hydrazone group nitrogen atom and carbonyl group oxygen atom or amino group nitrogen atom) can easily form at least one intramolecular cross-hydrogen bond. More preferably, as shown in the general formulas (12) and (13), a nitrogen atom, a hydrogen atom of an amino group, and a hetero atom (azo group or a tautomer thereof) constituting the heterocyclic group contained in the azo pigment structure
- the nitrogen atom of the hydrazone group and the oxygen atom of the carbonyl group or the nitrogen atom of the amino group) can easily form at least four intramolecular hydrogen bonds, and at least two intramolecular hydrogen bonds Is easy to form.
- the planarity of the molecule is improved, the intramolecular / intermolecular interaction is further improved, and for example, the crystallinity of the azo pigment represented by the general formula (12) is increased (it is easy to form a higher order structure). It is the most preferable example because the required performance as a pigment, which is light fastness, heat stability, wet heat stability, water resistance, gas resistance and / or solvent resistance, is greatly improved.
- the compounds represented by the general formulas (1) to (13) can be applied even if they contain isotopes (eg, 2H, 3H, 13C, 15N).
- azo pigments represented by the general formulas (1) to (13) are shown below, but the azo pigments used in the present invention are not limited to the following examples.
- the structures of the following specific examples are shown in the form of an ultimate structural formula among several tautomers that can be taken in terms of chemical structure, but have tautomeric structures other than those described. It goes without saying that it is also good.
- the pigment represented by the general formula (1) of the present invention may have any chemical form as long as the chemical structural formula is the general formula (1) or a tautomer thereof, and may be a pigment in any crystal form called polymorph.
- Crystal polymorphs refer to the same chemical composition but different arrangement of building blocks (molecules or ions) in the crystal.
- the crystal structure determines the chemical and physical properties, and each polymorph can be distinguished by its rheology, color, and other color characteristics. Different polymorphs can also be confirmed by X-Ray Diffraction (powder X-ray diffraction measurement result) or X-Ray Analysis (X-ray crystal structure analysis result).
- any polymorph may be used, and a mixture of two or more polymorphs may be used.
- the main component is preferably a single crystal type.
- the content of the azo pigment having a single crystal type is 70% to 100%, preferably 80% to 100%, more preferably 90% to the entire azo pigment. 100%, more preferably 95% to 100, particularly preferably 100%.
- an azo pigment having a single crystal form as a main component, the regularity of the dye molecule arrangement is improved, and intramolecular / intermolecular interaction is strengthened, making it easy to form a higher-order three-dimensional network. .
- it is preferable in terms of performance required for the pigment such as improvement of hue, light fastness, heat fastness, humidity fastness, oxidizing gas fastness and solvent resistance.
- the mixing ratio of crystal polymorphs in the azo pigment is determined from solid physicochemical measurements such as single crystal X-ray crystal structure analysis, powder X-ray diffraction (XRD), crystal micrograph (TEM), IR (KBr method), etc. I can confirm.
- the azo pigment represented by the general formula (1) when the azo pigment represented by the general formula (1) has an acid group, a part or all of the acid group may be in a salt form.
- Type pigments may be mixed.
- the salt type include salts of alkali metals such as Na, Li, and K, ammonium salts that may be substituted with alkyl groups or hydroxyalkyl groups, and organic amine salts.
- organic amines include lower alkyl amines, hydroxy substituted lower alkyl amines, carboxy substituted lower alkyl amines, and polyamines having 2 to 10 alkyleneimine units having 2 to 4 carbon atoms.
- the type is not limited to one type, and a plurality of types may be mixed.
- the plurality of acid groups when a plurality of acid groups are contained in one molecule, the plurality of acid groups may be salt type or acid type and may be different from each other.
- the azo pigment represented by the general formula (1) may be a hydrate containing water molecules in the crystal.
- the heterocyclic amine represented by the following general formula (A) is diazonium under acidic conditions, subjected to a coupling reaction with a compound represented by the following general formula (B), followed by post-treatment by a conventional method, An azo pigment represented by the formula (1) can be produced.
- heterocyclic amines represented by the above general formula (A) are generally known and commonly used methods such as those described in Helv. Chim. Acta, 41, 1958, 1052-1056 and Helv. Chim. Acta, 42, 1959, 349 to 352 and the like, and methods similar thereto.
- the compound represented by the general formula (B) can be produced by a method described in International Publication No. 06/082669 or JP-A-2006-57076 and a method analogous thereto.
- the diazoniumation reaction of the heterocyclic amine represented by the general formula (A) is, for example, in an acidic solvent such as sulfuric acid, phosphoric acid, acetic acid, hydrochloric acid, methanesulfonic acid, sodium nitrite, nitrosylsulfuric acid, isoamyl nitrite, etc.
- This reagent can be reacted at a temperature of 15 ° C. or lower for about 10 minutes to 6 hours.
- the coupling reaction is performed by reacting the diazonium salt obtained by the above-described method with the compound represented by the general formula (B) at 40 ° C. or lower, preferably 25 ° C. or lower for about 10 minutes to 12 hours. be able to.
- crystals are precipitated in this way, but in general, water or an alcohol solvent is added to the reaction solution to precipitate the crystals, and the crystals can be collected by filtration. it can. In addition, an alcohol solvent, water or the like can be added to the reaction solution to precipitate crystals, and the precipitated crystals can be collected by filtration. The collected crystals can be washed and dried as necessary to obtain an azo pigment represented by the general formula (1).
- the compound represented by the general formula (1) is obtained as a crude azo pigment (crude) by the above production method, it is desirable to perform post-treatment when used as the pigment of the present invention.
- post-treatment methods include solvent salt milling, salt milling, dry milling, solvent milling, pigment particle control step by grinding treatment such as acid pasting, solvent heating treatment, resin, surfactant and dispersant. The surface treatment process by etc. is mentioned.
- the compound represented by the general formula (1) of the present invention is preferably subjected to solvent heat treatment and / or solvent salt milling as a post-treatment.
- the solvent used in the solvent heat treatment include water, aromatic hydrocarbon solvents such as toluene and xylene, halogenated hydrocarbon solvents such as chlorobenzene and o-dichlorobenzene, and alcohols such as isopropanol and isobutanol.
- solvents, polar aprotic organic solvents such as N, N-dimethylformamide, N, N-dimethylacetamide, and N-methyl-2-pyrrolidone, glacial acetic acid, pyridine, and mixtures thereof.
- An inorganic or organic acid or base may be further added to the solvents mentioned above.
- the temperature of the solvent heat treatment varies depending on the desired primary particle diameter of the pigment, but is preferably 40 to 150 ° C, more preferably 60 to 100 ° C.
- the treatment time is preferably 30 minutes to 24 hours.
- Solvent salt milling includes, for example, charging a crude azo pigment, an inorganic salt, and an organic solvent that does not dissolve it into a kneader, and kneading and grinding therein.
- a water-soluble inorganic salt can be preferably used.
- an inorganic salt such as sodium chloride, potassium chloride, sodium sulfate is preferably used. It is more preferable to use an inorganic salt having an average particle size of 0.5 to 50 ⁇ m.
- the amount of the inorganic salt used is preferably 3 to 20 times by mass, more preferably 5 to 15 times by mass with respect to the crude azo pigment.
- organic solvent a water-soluble organic solvent can be suitably used, and the solvent easily evaporates due to a temperature rise during kneading, so that a high boiling point solvent is preferable from the viewpoint of safety.
- organic solvents include diethylene glycol, glycerin, ethylene glycol, propylene glycol, liquid polyethylene glycol, liquid polypropylene glycol, 2- (methoxymethoxy) ethanol, 2-butoxyethanol, 2- (isopentyloxy) ethanol, 2- (hexyloxy) ethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, di Propylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monomethyl ether, dipropylene Glycol or mixtures thereof.
- the amount of the water-soluble organic solvent used is preferably 0.1 to 5 times by mass with respect to the crude azo pigment.
- the kneading temperature is preferably 20 to 130 ° C, particularly preferably 40 to 110 ° C.
- a kneader for example, a kneader or a mix muller can be used.
- the vinyl polymer particles in the present invention include an azo pigment represented by the general formula (1), a tautomer thereof, a salt or hydrate thereof, and an aromatic ring bonded to the polymer main chain via a linking group.
- a vinyl polymer hereinafter also referred to as “resin” or “specific resin” containing the hydrophobic structural unit (a) and the hydrophilic structural unit (b) is contained.
- the vinyl polymer particles containing the pigment in the present invention can be produced by a conventional physical and chemical method using a specific resin and a pigment.
- JP-A-10-140065 JP-A-11-209672, JP-A-11-172180, JP-A-10-25440, or JP-A-11-43636. It can be manufactured by a method. Specific examples include the phase inversion method and acid precipitation method described in JP-A-9-151342 and JP-A-10-140065. Among them, the phase inversion method is preferable from the viewpoint of dispersion stability. It is preferable that the specific resin includes a hydrophobic structural unit (a) having an aromatic ring bonded to the polymer main chain via a linking group, and a hydrophilic structural unit (b).
- phase inversion method is basically a method of self-dispersing (phase-inversion emulsification) in which a mixed melt of a resin having self-dispersibility or solubility and a pigment is dispersed in water.
- the contained vinyl polymer particles can be obtained.
- the mixed molten material refers to a mixed state that is not dissolved, a state that is dissolved and mixed, or a state that includes both of these states.
- a more specific production method of the “phase inversion method” includes the method described in JP-A-10-140065.
- the acid precipitation method prepares a water-containing cake composed of a resin and a pigment, and neutralizes some or all of the anionic groups of the resin in the water-containing cake using a basic compound.
- This is a method for producing vinyl polymer particles containing a pigment.
- the acid precipitation method includes (1) a step of dispersing a resin and a pigment in an alkaline aqueous medium and subjecting the resin to gelation by performing a heat treatment as necessary; Hydrophobizing the resin by making it neutral or acidic, and strongly fixing the resin to the pigment; (3) obtaining a water-containing cake by performing filtration and washing as necessary; and (4) a water-containing cake.
- More specific production methods of the above phase inversion method and acid precipitation method include the methods described in JP-A-9-151342 and JP-A-10-140065.
- the vinyl polymer particles containing a pigment are obtained by a method including a step of obtaining a specific resin as an aqueous dispersion, specifically, the following steps (1) and (2). It can be obtained by providing a preparation step for preparing a dispersion of the vinyl polymer particles contained, and the production of the water-based ink for ink-jet recording of the present invention is provided with this preparation step, and a vinyl polymer containing the resulting pigment is prepared. It can be suitably performed by a method in which a dispersion of particles is used together with water and a water-soluble organic solvent to obtain a water-based ink.
- Step (2) From the dispersion Removing the organic solvent
- the stirring method is not particularly limited, and a commonly used mixing and stirring device, or a dispersing device such as an ultrasonic disperser, a high-pressure homogenizer, or a bead mill can be used as necessary.
- the organic solvent include alcohol solvents, ketone solvents, and ether solvents.
- the alcohol solvent include iso i-propyl alcohol, n-butanol, t-butanol, ethanol and the like.
- the ketone solvent include acetone, methyl ethyl ketone, diethyl ketone, and methyl isobutyl ketone.
- the ether solvent include dibutyl ether and dioxane.
- ketone solvents such as methyl ethyl ketone and alcohol solvents such as iso-i-propyl alcohol are preferable, and methyl ethyl ketone is most preferable.
- the neutralizing agent is used for neutralizing a part or all of the dissociable groups and forming a specific resin in a stable emulsified or dispersed state in water.
- the neutralizing agent used include basic compounds such as organic amine compounds, ammonia, and alkali metal hydroxides.
- the organic amine compound include monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monopropylamine, dipropylamine, monoethanolamine, diethanolamine, triethanolamine, N, N-dimethyl-ethanolamine.
- alkali metal hydroxide include lithium hydroxide, sodium hydroxide, and potassium hydroxide. Of these, sodium hydroxide, potassium hydroxide, triethylamine, and triethanolamine are preferable from the viewpoint of stabilizing dispersion in water, and sodium hydroxide and potassium hydroxide are particularly preferable.
- the content of the basic compound is preferably in the range of 5 to 120 mol%, more preferably in the range of 10 to 120 mol%, and still more preferably in the range of 80 to 120 mol% with respect to 100 mol% of the dissociable group. .
- the content is 5 mol% or more, it is effective for stabilizing the dispersion in water, and when it is 120 mol% or less, there is an effect of reducing water-soluble components.
- an organic solvent is distilled off from the dispersion obtained in the step (1) by a conventional method such as distillation under reduced pressure, and the phase is changed to an aqueous system, whereby the pigment particle surface becomes the resin.
- a dispersion of vinyl polymer particles containing the pigment coated with can be obtained.
- the organic solvent in the obtained dispersion is substantially removed, and the amount of the organic solvent here is preferably 0.2% by mass or less, and more preferably 0.1% by mass or less.
- a step of neutralizing a solution of a specific resin in the present invention having an anionic group dissolved in an organic solvent, a basic compound (neutralizing agent), and water (2) A step of mixing the obtained liquid mixture with a pigment to form a suspension, and then dispersing the pigment with a disperser or the like to obtain a pigment dispersion liquid; and (3) removing the organic solvent by, for example, distillation.
- a step of coating the pigment with a specific resin having an anionic group and dispersing it in an aqueous medium to form an aqueous dispersion can be provided to produce an aqueous ink for inkjet recording. More specifically, the descriptions in JP-A-11-2096722 and JP-A-11-172180 can be referred to.
- the average particle diameter of the vinyl polymer particles containing the pigment contained in the aqueous ink for inkjet recording of the present invention is preferably in the range of 10 to 400 nm, more preferably in the range of 10 to 200 nm, and in the range of 50 to 150 nm. Is more preferable.
- the average particle size is 10 nm or more, the production suitability is improved, and when it is 400 nm or less, the storage stability is improved.
- limiting in particular regarding the particle size distribution of the vinyl polymer particle containing a pigment Either a thing with a wide particle size distribution or a thing with a monodispersed particle size distribution may be sufficient.
- the average particle size and particle size distribution of the pigment-containing vinyl polymer particles are measured by a dynamic light scattering method using a nanotrack particle size distribution analyzer UPA-EX150 (manufactured by Nikkiso Co., Ltd.). Is required.
- the dispersion treatment can be performed using, for example, a ball mill, a roll mill, a bead mill, a high-pressure homogenizer, a high-speed stirring type disperser, an ultrasonic homogenizer, or the like.
- the content of the vinyl polymer particles in the water-based ink for ink-jet recording in the present invention is preferably 1 to 10% by weight, more preferably 2 to 8% by weight from the viewpoint of dispersion stability and concentration of the water-based ink for ink-jet recording. 2 to 6% by mass is particularly preferable.
- the water-based ink for inkjet recording of the present invention contains a water-soluble solvent as an essential component.
- a water-soluble organic solvent is mentioned as a water-soluble solvent.
- Water-soluble organic solvents are used for the purpose of drying inhibitors, wetting agents or penetration enhancers.
- An anti-drying agent is used for the purpose of preventing clogging due to drying of the ink-jet ink at the ink ejection port of the nozzle, and a water-soluble organic solvent having a vapor pressure lower than that of water is preferable as the anti-drying agent or wetting agent.
- a water-soluble organic solvent is preferably used as a penetration accelerator for the purpose of allowing ink jet ink to penetrate into paper better.
- water-soluble organic solvents examples include glycerin, 1,2,6-hexanetriol, trimethylolpropane, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, dipropylene glycol, polyoxyethylene Glyceryl ether, polyoxypropylene glyceryl ether, 2-butene-1,4-diol, 2-ethyl-1,3-hexanediol, 2-methyl-2,4-pentanediol, 1,2-octanediol, 1, Alkanediols (polyhydric alcohols) such as 2-hexanediol, 1,2-pentanediol, 4-methyl-1,2-pentanediol; vulcose, mannose, fructose, ribose, xylose, arabi Sugars such as sugars, galactose, aldonic acid
- Polyol compounds are useful for the purpose of drying inhibitors and wetting agents.
- glycerin ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3-butanediol, , 3-butanediol, 1,4-butanediol, 3-methyl-1,3-butanediol, 1,5-pentanediol, tetraethylene glycol, 1,6-hexanediol, 2-methyl-2,4- Examples include pentanediol, polyethylene glycol, 1,2,4-butanetriol, 1,2,6-hexanetriol, and the like. These may be used individually by 1 type and may use 2 or more types together.
- a polyol compound is preferable.
- the aliphatic diol include 2-ethyl-2-methyl-1,3-propanediol, 3,3-dimethyl-1,2-butanediol, 2, 2-diethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2,4-dimethyl-2,4-pentanediol, 2,5-dimethyl-2,5-hexane Examples include diol, 5-hexene-1,2-diol, 2-ethyl-1,3-hexanediol, and the like. Among these, preferred examples include 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol.
- the water-soluble solvent used in the present invention may be used alone or in combination of two or more.
- Preferable examples of the water-soluble solvent include glycerin, dipropylene glycol, polyoxyethylene glyceryl ether, and polyoxypropylene glyceryl ether.
- the content of the water-soluble organic solvent is 5% by mass to 60% by mass, and preferably 10% by mass to 40% by mass with respect to the total mass of the ink.
- the amount of water used in the present invention is not particularly limited, but is preferably 10% by mass or more and 99% by mass or less, more preferably 30% by mass or more and 80% by mass or less with respect to the total mass of the ink. It is. More preferably, it is 50 mass% or more and 70 mass% or less.
- the ink of the present invention preferably contains a surface tension adjusting agent.
- the surface tension adjusting agent include nonionic, cationic, anionic and betaine surfactants.
- the addition amount of the surface tension adjusting agent is preferably an amount for adjusting the surface tension of the ink of the present invention to 20 to 60 mN / m, more preferably 20 to 45 mN / m, in order to achieve good droplet ejection by inkjet. Preferably, the amount can be adjusted to 25 to 40 mN / m.
- the surfactant in the present invention a compound having a structure having both a hydrophilic part and a hydrophobic part in the molecule can be used effectively.
- Anionic surfactants cationic surfactants, amphoteric surfactants can be used. Any of the nonionic surfactants can be used. Furthermore, the above-mentioned polymer substance (polymer dispersing agent) can also be used as a surfactant.
- anionic surfactant examples include, for example, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium alkyldiphenyl ether disulfonate, sodium alkylnaphthalenesulfonate, sodium dialkylsulfosuccinate, sodium stearate, potassium oleate, Sodium dioctyl sulfosuccinate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, sodium dialkylsulfosuccinate, sodium stearate, sodium oleate, t-octylphenoxy Examples include sodium ethoxypolyethoxyethyl sulfate, and one or more of these are selected.
- Rukoto can.
- the nonionic surfactant include, for example, polyoxyethylene lauryl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene oleyl phenyl ether, polyoxyethylene nonyl phenyl ether, oxyethylene / oxypropylene block copolymer, t- Examples include octylphenoxyethyl polyethoxyethanol, nonylphenoxyethyl polyethoxyethanol, and the like, and one or more of these can be selected.
- cationic surfactants include tetraalkylammonium salts, alkylamine salts, benzalkonium salts, alkylpyridium salts, imidazolium salts, and the like. Specific examples include dihydroxyethyl stearylamine, 2-heptadecenyl. -Hydroxyethyl imidazoline, lauryl dimethyl benzyl ammonium chloride, cetyl pyridinium chloride, stearamide methyl pyridium chloride and the like.
- the amount of the surfactant added to the ink jet liquid composition in the invention is not particularly limited, but is preferably 1% by mass or more, more preferably 1 to 10% by mass, and still more preferably 1%. To 3% by mass.
- the ink of the present invention may contain other additives.
- Other additives include, for example, ultraviolet absorbers, anti-fading agents, anti-mold agents, pH adjusters, rust inhibitors, antioxidants, emulsion stabilizers, preservatives, antifoaming agents, viscosity modifiers, and dispersion stabilizers.
- Known additives such as agents and chelating agents are included.
- UV absorbers examples include benzophenone UV absorbers, benzotriazole UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, nickel complex salt UV absorbers, and the like.
- Organic anti-fading agents include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines, heterocycles, etc. Complex, zinc complex and the like.
- Antifungal agents include sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, ethyl p-hydroxybenzoate, 1,2-benzisothiazolin-3-one, sodium sorbate, sodium pentachlorophenol, etc. Can be mentioned. These are preferably used in an amount of 0.02 to 1.00% by mass in the ink.
- the pH adjuster is not particularly limited as long as it can adjust the pH to a desired value without adversely affecting the recording ink to be prepared, and can be appropriately selected according to the purpose.
- Amines eg, diethanolamine, triethanolamine, 2-amino-2-ethyl-1,3-propanediol
- alkali metal hydroxides eg, lithium hydroxide, sodium hydroxide, potassium hydroxide
- ammonium examples thereof include hydroxides (for example, ammonium hydroxide and quaternary ammonium hydroxides), phosphonium hydroxides, alkali metal carbonates, and the like.
- rust preventive agent examples include acidic sulfite, sodium thiosulfate, ammonium thiodiglycolate, di-propylammonium nitrite, pentaerythritol tetranitrate, dicyclohexylammonium nitrite and the like.
- antioxidants examples include phenol-based antioxidants (including hindered phenol-based antioxidants), amine-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants.
- chelating agent examples include sodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uramil diacetate and the like.
- the ink of the present invention may contain fine resin particles or polymer latex.
- resin fine particles or polymer latex acrylic resin, vinyl acetate resin, styrene-butadiene resin, vinyl chloride resin, acrylic-styrene resin, butadiene resin, styrene resin, crosslinked acrylic resin, crosslinked styrene resin Benzoguanamine resin, phenol resin, silicone resin, epoxy resin, urethane resin, paraffin resin, fluorine resin, and the like can be used.
- Preferred examples include acrylic resins, acrylic-styrene resins, styrene resins, cross-linked acrylic resins, and cross-linked styrene resins.
- the resin fine particles include self-dispersing polymer fine particles.
- Self-dispersing polymer fine particles are high molecular polymers that can be dispersed in an aqueous medium by the functional groups (particularly acidic groups or salts thereof) of the polymer itself in the absence of other surfactants. , Meaning polymer fine particles containing no free emulsifier.
- the dispersed state means both an emulsified state (emulsion) in which a polymer is dispersed in a liquid state in an aqueous medium and a dispersed state (suspension) in which a polymer is dispersed in a solid state in an aqueous medium. It includes the state of.
- the polymer is preferably a polymer that can be dispersed in a solid state.
- the self-dispersing polymer fine particles preferably used in the present invention preferably contain a polymer containing a hydrophilic structural unit and a structural unit derived from an aromatic group-containing monomer.
- the hydrophilic structural unit is not particularly limited as long as it is derived from a hydrophilic group-containing monomer, and even if it is derived from one kind of hydrophilic group-containing monomer, it contains two or more hydrophilic groups. It may be derived from a monomer.
- the hydrophilic group is not particularly limited, and may be a dissociable group or a nonionic hydrophilic group.
- the hydrophilic group is preferably a dissociable group and more preferably an anionic dissociative group from the viewpoint of promoting self-dispersion and the stability of the formed emulsified or dispersed state. Examples of the dissociable group include a carboxyl group, a phosphoric acid group, and a sulfonic acid group.
- a carboxyl group is preferable from the viewpoint of fixability when an ink composition is configured.
- the dissociable group-containing monomer include an unsaturated carboxylic acid monomer, an unsaturated sulfonic acid monomer, and an unsaturated phosphoric acid monomer.
- the unsaturated carboxylic acid monomer include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, and 2-methacryloyloxymethyl succinic acid.
- the unsaturated sulfonic acid monomer examples include styrene sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid, 3-sulfopropyl (meth) acrylate, and bis- (3-sulfopropyl) -itaconate. It is done.
- Specific examples of the unsaturated phosphoric acid monomer include vinyl phosphonic acid, vinyl phosphate, bis (methacryloxyethyl) phosphate, diphenyl-2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, dibutyl-2- Examples include acryloyloxyethyl phosphate. From the viewpoints of dispersion stability and ejection stability, unsaturated carboxylic acid monomers are preferred, and acrylic acid and methacrylic acid are more preferred.
- the aromatic group-containing monomer is not particularly limited as long as it is a compound containing an aromatic group and a polymerizable group.
- the aromatic group may be a group derived from an aromatic hydrocarbon or a group derived from an aromatic heterocycle. From the viewpoint of particle shape stability in an aqueous medium, an aromatic group derived from an aromatic hydrocarbon is preferable.
- the polymerizable group may be a condensation polymerizable polymerizable group or an addition polymerizable polymerizable group. In the present invention, from the viewpoint of particle shape stability in an aqueous medium, an addition polymerizable group is preferable, and a group containing an ethylenically unsaturated bond is more preferable.
- the aromatic group-containing monomer is preferably a monomer having an aromatic group derived from an aromatic hydrocarbon and an ethylenically unsaturated bond, and more preferably an aromatic group-containing (meth) acrylate monomer.
- the aromatic group-containing monomer include phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, and a styrene monomer.
- phenoxyethyl (meth) acrylate preferably at least one selected from phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, and phenyl (meth) acrylate. More preferred is phenoxyethyl (meth) acrylate, and particularly preferred is phenoxyethyl acrylate.
- the self-dispersing polymer fine particles include a structural unit derived from an aromatic group-containing (meth) acrylate monomer, and the content thereof is preferably 10% by mass to 95% by mass.
- the content of the aromatic group-containing (meth) acrylate monomer is 10% by mass to 95% by mass, the stability of the self-emulsification or dispersion state is improved, and the increase in the ink viscosity can be further suppressed. From the viewpoints of stability in a self-dispersing state, stabilization of particle shape in an aqueous medium due to hydrophobic interaction between aromatic rings, and reduction in the amount of water-soluble components due to appropriate hydrophobicity of the particles.
- the self-dispersing polymer fine particles can be composed of, for example, a structural unit composed of an aromatic group-containing monomer and a structural unit composed of a dissociable group-containing monomer, but further includes other structural units as necessary. Can be configured.
- the monomer that forms the other structural unit is not particularly limited as long as it is a monomer copolymerizable with the aromatic group-containing monomer and the dissociable group-containing monomer.
- an alkyl group-containing monomer is preferable from the viewpoint of flexibility of the polymer skeleton and ease of control of the glass transition temperature (Tg).
- alkyl group-containing monomer examples include methyl (meth) acrylate, ethyl (meth) acrylate, iso-propyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) ) Acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, ethylhexyl (meth) acrylate and other alkyl (meth) acrylates; hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl Ethylenically unsaturated monomers having a hydroxyl group such as (meth) acrylate, 4-hydroxybutyl (meth) acrylate, hydroxypentyl (meth) acrylate, hydroxyhexyl (meth) acrylate; Dialkylaminoal
- the molecular weight range of the polymer constituting the self-dispersing polymer fine particles in the present invention is preferably 3000 to 200,000, more preferably 5000 to 150,000, and more preferably 10,000 to 100,000 in terms of mass average molecular weight. More preferably it is.
- the mass average molecular weight is 3000 or more, the amount of water-soluble components can be effectively suppressed.
- self-dispersion stability can be improved by making a mass average molecular weight into 200,000 or less.
- the mass average molecular weight can be measured by gel permeation chromatography (GPC).
- GPC gel permeation chromatography
- the high molecular polymer constituting the self-dispersing polymer fine particles contains 15 to 90% by mass of an aromatic group-containing (meth) acrylate monomer, a carboxyl group-containing monomer and an alkyl group.
- Monomers preferably having an acid value of 25 to 100 and a weight average molecular weight of 3000 to 200,000, and an aromatic group-containing (meth) acrylate monomer as a copolymerization ratio of 15 to 80% by mass and carboxyl More preferably, it contains a group-containing monomer and an alkyl group-containing monomer, has an acid value of 25 to 95, and a weight average molecular weight of 5,000 to 150,000.
- the average particle size of the self-dispersing polymer fine particles is preferably in the range of 10 nm to 1 ⁇ m, more preferably in the range of 10 to 200 nm, still more preferably in the range of 20 to 100 nm, and particularly preferably in the range of 20 to 50 nm.
- the addition amount of the self-dispersing polymer fine particles is preferably 0.5 to 20% by mass, more preferably 3 to 20% by mass, and further preferably 5 to 15% by mass with respect to the ink.
- the glass transition temperature Tg of the self-dispersing polymer fine particles is preferably 30 ° C. or higher, more preferably 40 ° C. or higher, and further preferably 50 ° C. or higher.
- the particle size distribution of the polymer particles is not particularly limited, and may be any having a wide particle size distribution or a monodispersed particle size distribution. Further, two or more kinds of polymer fine particles having a monodispersed particle size distribution may be mixed and used.
- liquid composition for improving printability it is preferable to apply a liquid composition for improving printability to a print medium.
- a preferred example of the liquid composition that can be used in the present invention to improve the printability is a liquid composition that generates an aggregate by changing the pH of the ink.
- the pH of the liquid composition is preferably 1 to 6, more preferably 2 to 5, and still more preferably 3 to 5.
- polyacrylic acid As components of the liquid composition, polyacrylic acid, acetic acid, glycolic acid, malonic acid, malic acid, maleic acid, ascorbic acid, succinic acid, glutaric acid, fumaric acid, citric acid, tartaric acid, lactic acid, sulfonic acid, orthophosphoric acid, It is preferably selected from pyrrolidone carboxylic acid, pyrone carboxylic acid, pyrrole carboxylic acid, furan carboxylic acid, pyridine carboxylic acid, coumaric acid, thiophene carboxylic acid, nicotinic acid, derivatives of these compounds, or salts thereof. . These compounds may be used alone or in combination of two or more.
- a treatment liquid to which a polyvalent metal salt or polyallylamine is added can be mentioned.
- a polyvalent metal salt an alkaline earth metal of Group 2A of the periodic table (for example, magnesium and calcium); a transition metal of Group 3B of the periodic table (for example, lanthanum); from Group 3A of the periodic table Cations (for example, aluminum); lanthanides (for example, neodymium); and polyallylamine and polyallylamine derivatives.
- Preferred examples include calcium and magnesium.
- Anions that are preferably employed as a counter salt of calcium or magnesium include carboxylate (formic acid, acetic acid, benzoate, etc.), nitrate, chloride, and thiocyanate.
- the salt is added to the treatment liquid in an amount ranging from about 1 to about 10% by weight, preferably from about 1.5 to about 7% by weight, more preferably from about 2 to about 6% by weight. Can exist.
- the surface tension of the ink of the present invention is preferably 20 mN / m or more and 60 mN / m or less. More preferably, it is 20 mN or more and 45 mN / m or less, More preferably, it is 25 mN / m or more and 40 mN / m or less.
- the viscosity of the ink of the present invention at 20 ° C. is preferably 1.2 mPa ⁇ s or more and 15.0 mPa ⁇ s or less, more preferably 2 mPa ⁇ s or more and less than 13 mPa ⁇ s, still more preferably 2.5 mPa ⁇ s. This is less than 10 mPa ⁇ s.
- a known image receiving material that is, plain paper, resin-coated paper, such as JP-A-8-169172, JP-A-8-27693, JP-A-2-276670, JP-A-7-276789, JP-A-9-323475, JP-A-62-238783, JP-A-10-153789, JP-A-10-217473, JP-A-10-235995 10-337947, 10-217597, 10-337947, etc.
- paragraph numbers 0093 to 0105 in JP-A No. 2003-306623 can be applied as an ink jet recording method preferable for the present invention.
- a polymer latex compound may be used in combination for the purpose of imparting glossiness or water resistance or improving weather resistance.
- the timing of applying the latex compound to the image receiving material may be before, after, or simultaneously with the application of the colorant. Therefore, even when the addition place is in the image receiving paper, It may be in ink or may be used as a liquid material of polymer latex alone.
- JP 2002-166638 Japanese Patent Application 2000-363090
- JP 2002-121440 Japanese Patent Application 2000-315231
- JP 2002-154201 Japanese Patent Application 2000-354380
- JP 2002-144696 The methods described in Japanese Patent Application No. 2000-343944
- Japanese Patent Application Laid-Open No. 2002-080759 Japanese Patent Application Laid-Open No. 2002-080759
- a first step a step of applying a liquid composition for improving printability to a recording medium.
- Second step a step of applying an ink composition to the recording medium to which the liquid composition has been applied.
- Other steps are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a drying removal step and a heat fixing step.
- the drying removal step is not particularly limited except that the ink solvent in the ink composition applied to the recording medium is removed by drying, and can be appropriately selected according to the purpose.
- the heat fixing step is not particularly limited except that the latex particles contained in the ink used in the ink jet recording method are melt-fixed, and can be appropriately selected according to the purpose.
- a first step a step of applying a liquid composition for improving printability to an intermediate transfer member.
- Second step a step of applying an ink composition to the intermediate transfer body to which the liquid composition has been applied.
- Third step a step of transferring an ink image formed on the intermediate transfer member to a recording medium.
- Other steps are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a drying removal step and a heat fixing step.
- Phenoxyethyl methacrylate 55 parts by weight Methyl methacrylate 35 parts by weight Methacrylic acid 10 parts by weight 2-Mercaptoethanol 0.1 part by weight
- Example 1 The obtained 50% vinyl polymer solution was neutralized by adding a 5 mol / L sodium hydroxide aqueous solution to 10 parts by mass. Incidentally, an alkali amount for completely neutralizing methacrylic acid or acrylic acid of the vinyl polymer was added. 10 parts by mass of the pigment exemplified compound (Pig.-1) of the present invention was added, and kneaded with a roll mill for 2 to 8 hours as necessary. The kneaded product was dispersed in 100 parts by mass of ion-exchanged water. The organic solvent was completely removed from the obtained dispersion at 55 ° C.
- the vinyl polymer of this invention was synthesize
- the weight average molecular weight (Mw) of the obtained copolymer was 64000 (calculated in terms of polystyrene by gel permeation chromatography (GPC), the columns used were TSKgel SuperHZM-H, TSKgel SuperHZ4000, TSKgel SuperHZ200 (manufactured by Tosoh Corporation)), The acid value was 38.9 (mgKOH / g).
- 668.3 g of the polymerization solution was weighed, 388.3 g of isopropanol and 145.7 ml of 1 mol / L NaOH aqueous solution were added, and the temperature in the reaction vessel was raised to 80 ° C.
- Aqueous dispersion of pigment-containing vinyl polymer particles 25 parts by mass Glycerin 5 parts by mass Diethylene glycol 5 parts by mass Triethylene glycol monobutyl ether 5 parts by mass Polyoxypropylene glyceryl ether 10 parts by mass Dipropylene glycol 5 parts by mass Triethanolamine 1 part by mass Olphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.) 1 part by mass Aqueous dispersion of self-dispersing polymer fine particles (B-01) 15 parts by mass Ion-exchanged water 28 parts by mass The above was mixed to obtain an ink composition. When the pH of the ink composition was measured with a pH meter-WM-50EG manufactured by Toa DKK Co., Ltd., the pH was 8.5.
- the pigment ink composition shown in Table 1 was sealed in a PET container and aged for 4 weeks in a 58 ° C. environment.
- a DMP-2831 printer manufactured by FUJIFILM Dimatix was used as the ink jet recording apparatus, and a 10 cm line was printed with an ink droplet amount of 2 pL, an ejection frequency of 20 kHz, a nozzle array row direction ⁇ a transport direction of 16 ⁇ 1200 dpi.
- Fuji Photo Film Co., Ltd. picture-finishing photo finishing Pro was used as a recording medium.
- a ... Standard deviation is less than 3 .mu.m.
- B ... Standard deviation is not less than 3 .mu.m and less than 4 .mu.m.
- C ... Standard deviation is not less than 4 .mu.m and less than 4.55 .mu.m.
- D ... Standard deviation is not less than 4.5 .mu.m and less than 5 .mu.m. Standard deviation is 5 ⁇ m or more
- the ink was used even after storage under high temperature conditions by using the exemplary compound (Pig.-1) of the present invention as a pigment and using phenoxyethyl methacrylate as the hydrophobic structural unit of the vinyl polymer. It can be seen that particularly good results were obtained in the discharge accuracy evaluation.
- Experiments 106 to 110 show that good results were obtained by using the exemplified compound (Pig.-1) of the present invention as a pigment and using benzyl methacrylate as the hydrophobic structural unit of the vinyl polymer.
- the exemplary compound (Pig.-1) (Pig.-57) (Pig.-60) of the present invention is used as pigments. It can be seen that good results are obtained when a pigment in which the Q in the general formula (1) is the general formula (a) is used.
- Dispersant 1 Copolymer of the following monomers: n-butyl methacrylate 35% by mass N-butyl acrylate 10% by mass 2-hydroxyethyl methacrylate 15% by mass Methacrylic acid 20% by mass 20% by mass of styrene
- Dispersant 2 Copolymer of the following monomers: n-butyl methacrylate 35% by mass N-butyl acrylate 10% by mass 2-hydroxyethyl methacrylate 15% by mass Methacrylic acid 20% by mass 20% by mass 20% by mass of styrene
- Example 2 In the experiments 106 to 110 of Example 1, the benzyl methacrylate of the hydrophobic structural unit of the polymer was changed to phenoxyethyl acrylate or benzyl acrylate with the composition shown in Table 3, and synthesized by the same method as in Synthesis Example 1 above. did. Other than that, water-based ink for inkjet recording was prepared in the same manner as in Experiments 106 to 110, and the ejection accuracy was evaluated in the same manner as in Example 1. As shown in Table 3, the results were as good as in Experiments 106 to 110. Showed performance.
- hydrophilic structural unit methacrylic acid in Experiment 109 of Example 1 was changed to acrylic acid, and other than that, water-based ink for inkjet recording was prepared in the same manner as in Experiment 109, and ejection accuracy was similar to that in Example 1. As shown in Table 3, the performance was as good as in Experiment 109.
- methyl methacrylate of the structural unit (c) in Experiment 109 of Example 1 was converted to methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, methacrylic acid with the composition shown in Table 2.
- a water-based ink for ink-jet recording was prepared in the same manner as in Experiment 109 except that the acid was changed to cyclohexyl acid, cyclohexyl acrylate, and styrene, and the ejection accuracy was evaluated in the same manner as in Example 1. As shown in Table 3, As shown in FIG.
- Example 3 Instead of storing the inkjet recording water-based ink in a PET container and storing it in a 58 ° C. environment for 4 weeks using the pigment and the high molecular weight polymer shown in Table 4, high density polyethylene is used. After sealing in a container and storing at room temperature for 4 months, the ejection accuracy was evaluated in the same manner as in Example 1. As shown in Table 4, the water-based ink for ink jet recording of Examples 1 to It was confirmed that good performance equivalent to 2 was obtained.
- Example 4 Inks obtained by replacing the aqueous dispersion of self-dispersing polymer fine particles (B-01) with ion-exchanged water in the preparation of water-based inks in Examples 1 to 3 using the pigments and polymer polymers described in Table 5
- the aqueous ink for inkjet recording was prepared in the same manner as in Examples 1 to 3 except that, and the ejection accuracy was evaluated in the same manner as in Example 1.
- the aqueous ink for inkjet recording of the present invention was As shown in Table 5, good performance equivalent to that of Examples 1 to 3 was exhibited.
- Example 5 In Examples 1 to 3, instead of using Fujifilm's painting photo finish Pro as a recording medium, “Ulite” manufactured by Nippon Paper Industries Co., Ltd., “Xerox 4024” manufactured by Fuji Xerox Co., Ltd., Examples using Oji Paper's “OK Prince Fine”, Nippon Paper's “Shiorai”, Oji Paper's “OK Everlight Coat”, Nippon Paper's “Aurora Coat”, or Mitsubishi Paper Industries' “Tokuhishi Art” When the ejection accuracy was evaluated in the same manner as in Example 1, it was confirmed that when the water-based ink for inkjet recording of the present invention was used, good performance was obtained as in Examples 1 to 3.
- an aqueous ink for ink jet recording that has excellent ejection accuracy and can suppress the occurrence of density unevenness and streak unevenness even after long-term storage or after exposure to high temperatures. Can do.
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Abstract
Description
しかし、長期間あるいは高温で経時されたインクにおいて濃度ムラ及び筋ムラが生じることが判明した。
インクジェット記録用水系インクとして、C.I.ピグメントイエロー74とアニオン性基含有有機高分子化合物を含有する水性顔料分散体を有するインクジェット記録用水分散体が開示されている(例えば、特許文献1参照)。具体的には、顔料としてC.I.ピグメントイエロー74と、分散剤としてメタクリル酸n-ブチルとアクリル酸n-ブチルとメタクリル酸2-ヒドロキシエチルとメタクリル酸及びスチレンとの共重合体とを用いることで、分散性と分散安定性及び鮮明な画像を形成することができるとされている。
本発明の課題は、長期間保存後又は高温に晒された後であっても、吐出精度に優れ、濃度ムラ及び筋ムラの発生を抑制することが可能なインクジェット記録用水性インクを提供することにある。
即ち、以下の手段により本発明の目的は達成される。
〔1〕
A及びBを含有するビニルポリマー粒子及び水溶性溶媒を含むことを特徴とするインクジェット記録用水性インク。
A:下記一般式(1)で表されるアゾ顔料、その互変異性体、それらの塩又は水和物
B:ポリマー主鎖に連結基を介して結合した芳香環を有する疎水性構造単位(a)と、親水性構造単位(b)とを含むビニルポリマー
〔2〕
前記疎水性構造単位(a)が下記一般式(I)で表される疎水性構造単位(a1)を含むことを特徴とする〔1〕に記載のインクジェット記録用水性インク。
〔3〕
前記疎水性構造単位(a)が更に、アクリル酸又はメタクリル酸の、アルキルエステルに由来する疎水性構造単位(a2)を含むことを特徴とする〔1〕又は〔2〕に記載のインクジェット記録用水性インク。
〔4〕
前記疎水性構造単位(a)がフェノキシエチル(メタ)アクリレートに由来の構造単位及びベンジル(メタ)アクリレートに由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して20質量%以上含み、前記親水性構造単位(b)がアクリル酸及びメタクリル酸に由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して30質量%以下含む、ことを特徴とする〔1〕~〔3〕のいずれかに記載のインクジェット記録用水性インク。
〔5〕
前記疎水性構造単位(a)が、フェノキシエチル(メタ)アクリレートに由来の構造単位を総量でビニルポリマー全質量に対して20質量%以上含むことを特徴とする〔1〕~〔4〕のいずれかに記載のインクジェット記録用水性インク。
〔6〕
一般式(1)で表されるアゾ顔料が、下記一般式(2)で表されることを特徴とする〔1〕~〔5〕のいずれかに記載のインクジェット記録用水性インク。
〔7〕
一般式(1)中、Qが炭素原子と共に5員含窒素ヘテロ環を形成することを特徴とする〔1〕~〔6〕のいずれかに記載のインクジェット記録用水性インク。
〔8〕
一般式(1)中のnが2であることを特徴とする〔1〕~〔7〕のいずれかに記載のインクジェット記録用水性インク。
〔9〕
一般式(2)中のX1が水素原子であることを特徴とする〔6〕~〔8〕のいずれかに記載のインクジェット記録用水性インク。
〔10〕
一般式(1)で表されるアゾ顔料が、下記一般式(3)で表されることを特徴とする〔1〕~〔6〕のいずれかに記載のインクジェット記録用水性インク。
〔11〕
一般式(3)で表されるアゾ顔料が、下記一般式(4)で表されることを特徴とする〔10〕に記載のインクジェット記録用水性インク。
〔12〕
W、W1、W2が、それぞれ独立に総炭素数3以下のアルコキシ基、アミノ基、総炭素数3以下のアルキルアミノ基であることを特徴とする〔1〕~〔11〕のいずれかに記載のインクジェット記録用水性インク。
〔13〕
G、G1、G2が、それぞれ独立に総炭素数3以下のアルキル基であることを特徴とする〔10〕又は〔11〕に記載のインクジェット記録用水性インク。
〔14〕
Zが、6員含窒素ヘテロ環であることを特徴とする〔11〕~〔13〕のいずれかに記載のインクジェット記録用水性インク。
本発明のインクジェット記録用水性インクは、A及びBを含有するビニルポリマー粒子及び水溶性溶媒を含む。
A:下記一般式(1)で表されるアゾ顔料、その互変異性体、それらの塩又は水和物
B:ポリマー主鎖に連結基を介して結合した芳香環を有する疎水性構造単位(a)と、親水性構造単位(b)とを含むビニルポリマー
主鎖と連結基を介して結合した芳香環を有する疎水性構造単位(a)(以下単に「疎水性構造単位(a)」と称する場合がある)における芳香環としては、特に限定されないが、ベンゼン環、炭素数8以上の縮環型芳香環、芳香環が縮環したヘテロ環、又は二個以上連結したベンゼン環が挙げられる。
(a)は、一般式(I)で表される疎水性構造単位(a1)を含むことが好ましい。疎水性構造単位(a)は更に、アクリル酸又はメタクリル酸の、アルキルエステルに由来する疎水性構造単位(a2)を有していてもよい。
一般式(I)で表される疎水性構造単位(a1)(以下単に「疎水性構造単位(a1)」と称する場合がある。)の含有量は、顔料の分散安定性、吐出精度、洗浄性の観点から、前記ビニルポリマーの全質量のうち10質量%以上75質量%未満であることが好ましく、20質量%以上70質量%未満であることがより好ましく、30質量%以上60質量%未満であることが特に好ましい。
ここで、前記置換基としては、ハロゲン原子、アルキル基、アルコキシ基、水酸基等、シアノ基等が挙げられるが、特に限定されない。
L2が2価の連結基である場合、好ましくは炭素数1~30の連結基であり、より好ましくは炭素数1~25の連結基であり、更に好ましくは炭素数1~20の連結基である。中でもアルキレンオキシ基及びアルキレン基より選択される少なくとも一つを含む炭素数1~25の2価の連結基であることが好ましく、-(CH2-CH2)n-、-(CH2O)n-又は-(CH2-CH2-O)n-(nは平均の繰り返し単位数を表し、n=1~6であり、nは1又は2が好ましく、1がより好ましい)であることが好ましい。
また、一般式(I)で表される疎水性構造単位(a1)はベンゼン環、炭素数8以上の縮環型芳香環、芳香環が縮環したヘテロ環、又は二個以上連結したベンゼン環から誘導される1価の基を含むことが好ましい。前記の芳香環を採用することで顔料との吸着性などの相互作用が発揮できるからである。
本発明においては、前記疎水性構造単位(a)がフェノキシエチル(メタ)アクリレートに由来の構造単位を総量でビニルポリマー全質量に対して20質量%以上含むことが更に好ましい。
前記疎水性構造単位(a)はアクリル酸又はメタクリル酸の、アルキルエステルに由来する疎水性構造単位(a2)を含有してもよい。
アルキルエステルの炭素数は炭素数1~18が好ましく、炭素数1~8がより好ましく、炭素数1~4が更に好ましく、炭素数1~2が特に好ましい。
疎水性構造単位(a2)の含有量は高分子ビニルポリマー中に好ましくは5質量%以上70質量%以下、更に好ましくは、20質量%以上60質量%以下である。
疎水性構造単位(a2)の具体例としては、メチル(メタ)アクリレート、エチル(メタ)アクリレート、(イソ)プロピル(メタ)アクリレート、(イソ又はターシャリー)ブチル(メタ)アクリレート、シクロへキシル(メタ)アクリレート、ドデシル(メタ)アクリレート、ステアリル(メタ)アクリレート等の(メタ)アクリレート類が挙げられる。
中でもメチル(メタ)アクリレート、エチル(メタ)アクリレート、シクロへキシル(メタ)アクリレートが好ましい。
本発明におけるビニルポリマーに含まれる親水性構造単位(b)について説明する。
親水性構造単位(b)の例として、カルボン酸を有するアクリル酸、メタクリル酸を挙げることができる。また、非イオン性の親水性基を含有する親水性構造単位を挙げることができる。
親水性の官能基としては、水酸基、アミノ基、(窒素原子が無置換の)アミド基及び、後述するようなポリエチレンオキシド、ポリプロピレンオキシド等のアルキレンオキシド重合体が挙げられる。
これらのうち、ヒドロキシエチル(メタ)アクリレート、ヒドロキシブチル(メタ)アクリレート、(メタ)アクリルアミド、アミノエチルアクリレート、アミノプロピルアクリレート、アルキレンオキシド重合体を含有する(メタ)アクリレートが特に好ましい。
前記アルキレンオキシド重合体のアルキレンとしては、親水性の観点から炭素数1~6が好ましく、炭素数2~6がより好ましく、炭素数2~4が特に好ましい。
また、前記アルキレンオキシド重合体の重合度としては、1~120が好ましく、1~60がより好ましく、1~30が特に好ましい。
本発明におけるビニルポリマーは、前述の通り、前記疎水性構造単位(a1)、前記疎水性構造単位(a2)、及び前記親水性構造単位(b)とは異なる構造を有する構造単位
(c)(以下、単に「構造単位(c)」という。)を含有することもできる。
前記構造単位(c)の含有量は、ビニルポリマー全質量に対して、15質量%以上80質量%以下が好ましく、25質量%以上70質量%以下が好ましく、40質量%以上60質量%以下がより好ましい。
前記疎水性の構造単位を形成しうるモノマーとしては、入手性、取り扱い性、汎用性の観点から、ビニルモノマー類、((メタ)アクリルアミド類、スチレン類、ビニルエステル類等)が好ましい。
これらは、それぞれ単独で又は2種以上を混合して用いることができる。
インクジェット記録用水性インクとしてより好ましくは、前記ビニルポリマーの前記疎水性構造単位(a)がフェノキシエチル(メタ)アクリレートに由来の構造単位及びベンジル(メタ)アクリレートに由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して20質量%以上含み、前記親水性構造単位(b)がアクリル酸及びメタクリル酸に由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して30質量%以下含むものがより好ましい。
なお、ここでいう酸価とは、ビニルポリマーの1gを完全に中和するのに要するKOHの質量(mg)で定義され、JIS規格(JISK0070、1992)記載の方法により測定することができる。
前記分子量を上記範囲とすることにより、分散剤としての立体反発効果が良好な傾向となり、また立体効果により顔料への吸着に時間がかからなくなる傾向の観点から好ましい。
また、本発明で用いるビニルポリマーの分子量分布(質量平均分子量値/数平均分子量値で表される)は、1~6であることが好ましく、1~4であることがより好ましい。
前記分子量分布を上記範囲とすることは、インクの分散安定性、吐出安定性の観点から好ましい。ここで数平均分子量及び、質量平均分子量は、TSKgel GMHxL、TSKgel G4000HxL、TSKgel G2000HxL(何れも東ソー(株)製の商品名)のカラムを使用したGPC分析装置により、溶媒THF、示差屈折計により検出し、標準物質としてポリスチレンを用い換算して表した分子量である。
重合の開始方法はラジカル開始剤を用いる方法、光又は放射線を照射する方法等がある。これらの重合方法、重合の開始方法は、例えば鶴田禎二「高分子合成方法」改定版(日刊工業新聞社刊、1971)や大津隆行、木下雅悦共著「高分子合成の実験法」化学同人、昭和47年刊、124~154頁に記載されている。
上記重合方法のうち、特にラジカル開始剤を用いた溶液重合法が好ましい。溶液重合法で用いられる溶剤は、例えば酢酸エチル、酢酸ブチル、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン、テトラヒドロフラン、ジオキサン、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、ベンゼン、トルエン、アセトニトリル、塩化メチレン、クロロホルム、ジクロロエタン、メタノール、エタノール、1-プロパノール、2-プロパノール、1-ブタノールのような種々の有機溶剤の単独あるいは2種以上の混合物でも良いし、水との混合溶媒としても良い。
重合温度は生成するポリマーの分子量、開始剤の種類などと関連して設定する必要があり、通常、0℃~100℃程度であるが、50~100℃の範囲で重合を行うことが好ましい。
反応圧力は、適宜選定可能であるが、通常は、1~100kg/cm2、特に、1~30kg/cm2程度が好ましい。反応時間は、5~30時間程度である。得られた樹脂は再沈殿などの精製を行っても良い。
本発明に用いられるアゾ顔料は、一般式(1)で表される。
まず、下記一般式(1)で表されるアゾ顔料について説明する。
一般式(1)で表される化合物は、その特異的な構造により色素分子の分子内・分子間相互作用を形成しやすく、水又は有機溶媒等に対する溶解性が低く、好ましい形態のアゾ顔料とすることができる。
顔料は、水や有機溶媒等に分子分散状態で溶解させて使用する染料とは異なり、媒体中に分子集合体等の粒子として微細に分散させて用いるものである。
詳細には、アルキル基としては、好ましくは、炭素数1から30のアルキル基、好ましくは炭素数1~8例えば、メチル基、エチル基、n-プロピル基、i-プロピル基、t-ブチル基、n-オクチル基、エイコシル基、2-クロロエチル基、2-シアノエチル基、2―エチルヘキシル基等が挙げられ、シクロアルキル基としては、好ましくは、炭素数3から30の置換又は無置換のシクロアルキル基、例えば、シクロヘキシル基、シクロペンチル基、4-n-ドデシルシクロヘキシル基等が挙げられ、ビシクロアルキル基としては、好ましくは、炭素数5から30の置換若しくは無置換のビシクロアルキル基、つまり、炭素数5から30のビシクロアルカンから水素原子を一個取り去った一価の基、例えば、ビシクロ[1,2,2]ヘプタン-2-イル基、ビシクロ[2,2,2]オクタン-3-イル基等が挙げられる。
例えば、メチルアミノ基、ジメチルアミノ基、アニリノ基、N-メチル-アニリノ基、ジフェニルアミノ基等が挙げられる。
好ましくは、炭素数6から30の置換若しくは無置換のアリール基が挙げられ、その中でも、炭素数6から18の置換若しくは無置換のアリール基が好ましく、更に炭素数6から12の置換若しくは無置換のアリール基が好ましく、例えば、フェニル基、p-トリル基、ナフチル基、m-クロロフェニル基、o-ヘキサデカノイルアミノフェニル基等が挙げられる。
より好ましくは、総炭素数5以下のアルコキシ基、アミノ基(-NH2基)、総炭素数5以下のアルキルアミノ基である。Wが総炭素数5以下のアルコキシ基、アミノ基、総炭素数5以下のアルキルアミノ基の場合、色素分子が分子内及び分子間の少なくとも一方で水素結合を強固に形成しやすくなり、良好な色相、高い堅牢性(例えば、耐光、耐ガス、耐熱、耐水、耐薬品等)の点で好ましい。
色相、光堅牢性、耐溶剤性の点から特に好ましくは、総炭素数3以下のアルコキシ基、アミノ基(-NH2基)、総炭素数3以下のアルキルアミノ基であり、その中でも特にメトキシ基(-OCH3基)又はエトキシ基(-OC2H5基)が好ましく、良好な色相と光堅牢性向上の点からメトキシ基が最も好ましい。
R1を総炭素数の小さい(例えば、炭素数1~4)直鎖アルキル基又は分岐アルキル基にすることで、よりすぐれた色相、着色力、画像堅牢性を達成できる。
中でも(a)~(f)又は(j)が好ましく、更に(a)、(b)、(c)、(e)、(j)で表されるヘテロ環であることが好ましく、特に(a)、(c)、で表されるヘテロ環であることが好ましく、(a)が色相、着色力、画像堅牢性の点から最も好ましい。なお、下記一般式(a)~(j)において、「*」は一般式(1)におけるアゾ基との結合位置を表す。
より好ましくは、総炭素数5以下のアルコキシ基、アミノ基(-NH2基)、総炭素数5以下のアルキルアミノ基である。Wが総炭素数5以下のアルコキシ基、アミノ基、総炭素数5以下のアルキルアミノ基の場合、良好な色相、高い堅牢性(耐光・ガス・熱・水・薬品)の点で好ましい。
色相、光堅牢性、耐溶剤性の点から特に好ましくは、総炭素数3以下のアルコキシ基、アミノ基(-NH2基)、総炭素数3以下のアルキルアミノ基であり、その中でも特にメトキシ基(-OCH3基)又はエトキシ基(-OC2H5基)、アミノ基が好ましく、良好な色相と光堅牢性向上の点からメトキシ基が最も好ましい。
アルキルチオ基としては、好ましくは、炭素数1から30の置換若しくは無置換のアルキルチオ基、例えば、メチルチオ基、エチルチオ基、n-ヘキサデシルチオ基等が挙げられる。
より好ましくは、総炭素数5以下のアルコキシ基、アミノ基(-NH2基)、総炭素数5以下のアルキルアミノ基である。Wが総炭素数5以下のアルコキシ基、アミノ基、総炭素数5以下のアルキルアミノ基の場合、良好な色相、高い堅牢性(耐光・ガス・熱・水・薬品)の点で好ましい。
色相、光堅牢性、耐溶剤性の点から特に好ましくは、総炭素数3以下のアルコキシ基、アミノ基(-NH2基)、総炭素数3以下のアルキルアミノ基であり、その中でも特にメトキシ基(-OCH3基)又はエトキシ基(-OC2H5基)が好ましく、良好な色相と光堅牢性向上の点からメトキシ基が最も好ましい。
中でも(a)~(f)又は(j)が好ましく更に(a)、(b)、(c)、(e)、(j)が好ましく、特に(a)、(c)が好ましく、(a)が色相、着色力、画像堅牢性の点から最も好ましい。
より好ましくは、総炭素数5以下のアルコキシ基、アミノ基(-NH2基)、総炭素数5以下のアルキルアミノ基である。Wが総炭素数5以下のアルコキシ基、アミノ基、総炭素数5以下のアルキルアミノ基の場合、良好な色相、高い堅牢性(耐光・ガス・熱・水・薬品)の点で好ましい。
色相、光堅牢性、耐溶剤性の点から特に好ましくは、総炭素数3以下のアルコキシ基、アミノ基(-NH2基)、総炭素数3以下のアルキルアミノ基であり、その中でも特にメトキシ基(-OCH3基)又はエトキシ基(-OC2H5基)が好ましく、良好な色相と光堅牢性向上の点からメトキシ基が最も好ましい。
中でも(a)~(f)又は(j)が好ましく更に(a)、(b)、(c)、(e)、(j)が好ましく、特に(a)、(c)が好ましく、(a)が色相、着色力、画像堅牢性の点から最も好ましい。
Qが炭素原子と共に形成する5員のヘテロ環として特に上記一般式(a)、(b)、(c)が好ましく、その中でも一般式(a)がもっとも好ましい。
より好ましくは、総炭素数5以下のアルコキシ基、アミノ基(-NH2基)、総炭素数5以下のアルキルアミノ基である。Wが総炭素数5以下のアルコキシ基、アミノ基、総炭素数5以下のアルキルアミノ基の場合、良好な色相、高い堅牢性(耐光・ガス・熱・水・薬品)の点で好ましい。
色相、光堅牢性、耐溶剤性の点から特に好ましくは、総炭素数3以下のアルコキシ基、アミノ基(-NH2基)、総炭素数3以下のアルキルアミノ基であり、その中でも特にメトキシ基(-OCH3基)又はエトキシ基(-OC2H5基)が好ましく、良好な色相と光堅牢性向上の点からメトキシ基が最も好ましい。
より好ましくは総炭素数6以下のアルキル基、総炭素数6以下のシクロアルキル基、総炭素数12以下のアラルキル基、総炭素数12以下のアルケニル基、総炭素数12以下のアルキニル基、総炭素数18以下のアリール基又は総炭素数12以下のヘテロ環基を表す。
更に好ましくは、水素原子、メチル基、エチル基、n-プロピル基、イソi-プロピル基、t-ブチル基、シクロプロピル基、ベンジル基、2-フェネチル基、ビニル基、アリル基、エチニル基若しくはプロパルギル基、ベンジル基、2-フェネチル基、フェニル基、p-トリル基、ナフチル基、ピリジル基、ピリミジニル基、ピラジニル基を表す。
特に水素原子、メチル基、フェニル基、ピリジル基、ピリミジニル基、ピラジニル基が好ましく、その中でも、メチル基、2-ピリジル基、2,6-ピリミジニル基、2,5-ピラジニル基が好ましく、メチル基であることが最も好ましい。
G1、G2はそれぞれ独立に、前記一般式(3)中のGと同義である。
R11、R12はそれぞれ独立に、前記一般式(3)中のR1と同義である。
W1、W2はそれぞれ独立に、前記一般式(3)中のWと同義である。
Y1、Y2はそれぞれ独立に、前記一般式(3)中のYと同義である。
Zは、前記一般式(3)中のR2が二価の置換基を表す場合と同義である。
G1、G2はそれぞれ独立に、前記一般式(3)中のGと同義である。
R11、R12はそれぞれ独立に、前記一般式(3)中のR1と同義である。
W1、W2はそれぞれ独立に、前記一般式(3)中のWと同義である。
Z1、Z2はそれぞれ独立に、前記一般式(3)中のR2と同義である。
Yは、前記一般式(3)中のYが二価の置換基を表す場合と同義である。
G1、G2はそれぞれ独立に、前記一般式(3)中のGと同義である。
R11、R12はそれぞれ独立に、前記一般式(3)中のR1と同義である。
W1、W2はそれぞれ独立に、前記一般式(3)中のWと同義である。
Y1、Y2はそれぞれ独立に、前記一般式(3)中のYと同義である。
Z1、Z2はそれぞれ独立に、前記一般式(3)中のR2と同義である。
Xは、前記一般式(3)中のX1又はX2が二価の置換基を表す場合と同義である。
G1、G2はそれぞれ独立に、前記一般式(3)中のGと同義である。
R11、R12はそれぞれ独立に、前記一般式(3)中のR1と同義である。
Y1、Y2はそれぞれ独立に、前記一般式(3)中のYと同義である。
Z1、Z2はそれぞれ独立に、前記一般式(3)中のR2と同義である。
Wは、前記一般式(3)中のWが二価の置換基を表す場合と同義である。
G1、G2はそれぞれ独立に、前記一般式(3)中のGと同義である。
W1、W2はそれぞれ独立に、前記一般式(3)中のWと同義である。
Y1、Y2はそれぞれ独立に、前記一般式(3)中のYと同義である。
Z1、Z2はそれぞれ独立に、前記一般式(3)中のR1と同義である。
Rは、前記一般式(3)中のR1が二価の置換基を表す場合と同義である。
R11、R12はそれぞれ独立に、前記一般式(3)中のR1と同義である。
W1、W2はそれぞれ独立に、前記一般式(3)中のWと同義である。
Y1、Y2はそれぞれ独立に、前記一般式(3)中のYと同義である。
Z1、Z2はそれぞれ独立に、前記一般式(3)中のR1と同義である。
Gは、前記一般式(3)中のGが二価の置換基を表す場合と同義である。
一般式(1)は、化学構造上取りうる数種の互変異性体の中から極限構造式の形で示しているが、記載された構造以外の互変異性体であってもよく、複数の互変異性体を含有した混合物として用いても良い。
例えば、一般式(4)で表される顔料には、下記一般式(4’)で表されるアゾ-ヒドラゾンの互変異性体が考えられる。
本発明は、一般式(4)で表されるアゾ顔料の互変異性体である以下の一般式(4’)で表される化合物もその範囲に含むものである。
上記一般式(11)中のG、R1、R2、W及びYは、上記一般式(3)中のG、R1、R2、W及びYと同義である。
X11、X12はそれぞれ独立に上記一般式(4)中のZが構成するヘテロ環を表し、Het.が構成するヘテロ環中のそれぞれヘテロ原子を表す。
G1、G2及びG3、はそれぞれ独立に上記一般式(3)中のGと同義である。
W1、W2及びW3は、それぞれ独立に上記一般式(3)中のWと同義である。
Y1Y2及びY3は、それぞれ独立に上記一般式(3)中のYと同義である。
R11、R12、R13は、それぞれ独立に上記一般式(3)中のR1と同義である。
X11、X12及びX13はそれぞれ独立に上記一般式(3)中のR2が3価のヘテロ環を表す場合と同義であり、Het.が構成するヘテロ環中のそれぞれヘテロ原子を表す。
また、本発明において、一般式(1)で表されるアゾ顔料は、分子内水素結合又は分子内交叉水素結合を形成する置換基を有することが好ましい。少なくとも1個以上の分子内交叉水素結合を形成する置換基を有することが好ましく、少なくとも3個以上の分子内水素結合を形成する置換基を有することがより好ましく、少なくとも3個以上の分子内水素結合を形成する置換基を有し、かつ、それらの水素結合の少なくとも2個が分子内交叉水素結合を形成する置換基を有する場合が特に好ましい。
この構造が好ましい要因としては、上記一般式(10)及び(11)で示すようにアゾ顔料構造に含有するヘテロ環基を構成する窒素原子、アミノ基の水素原子及びヘテロ原子(アゾ基又はその互変異性体であるヒドラゾン基の窒素原子とカルボニル基の酸素原子又はアミノ基の窒素原子)が少なくとも1個以上の分子内の交叉水素結合を容易に形成し易いことが挙げられる。
更に好ましくは、上記一般式(12)及び(13)で示すようにアゾ顔料構造に含有するヘテロ環基を構成する窒素原子、アミノ基の水素原子及びヘテロ原子(アゾ基又はその互変異性体であるヒドラゾン基の窒素原子とカルボニル基の酸素原子又はアミノ基の窒素原子)が少なくとも4個以上の分子内水素結合を容易に形成し易く、かつ、少なくとも2個以上の分子内の交叉水素結合を容易に形成し易いことが挙げられる。
その結果、分子の平面性が上がり、更に分子内・分子間相互作用が向上し、例えば一般式(12)で表されるアゾ顔料の結晶性が高くなり(高次構造を形成し易くなり)、顔料としての要求性能である、光堅牢性、熱安定性、湿熱安定性、耐水性、耐ガス性及び又は耐溶剤性が大幅に向上するため、最も好ましい例となる。
本発明の一般式(1)~(4)で表される顔料に結晶多形が存在する場合、どの多形であってもよく、また2種以上の多形の混合物であっても良いが、結晶型が単一のものを主成分とすることが好ましい。すなわち結晶多が混入していないものが好ましく、単一の結晶型を有するアゾ顔料の含有量はアゾ顔料全体に対し70%~100%、好ましくは80%~100%、より好ましくは90%~100%、更に好ましくは95%~100、特に好ましくは100%である。単一の結晶型を有するアゾ顔料を主成分とすることで、色素分子の配列に対して規則性が向上し、分子内・分子間相互作用が強まり高次な3次元ネットワークを形成しやすくなる。その結果として色相の向上・光堅牢性・熱堅牢性・湿度堅牢性・酸化性ガス堅牢性及び耐溶剤性等、顔料に要求される性能の点で好ましい。
アゾ顔料における結晶多形の混合比は、単結晶X線結晶構造解析、粉末X線回折(XRD)、結晶の顕微鏡写真(TEM)、IR(KBr法)等の固体の物理化学的測定値から確認できる。
上記一般式(B)で表される化合物は、国際公開第06/082669号や特開2006-57076号公報に記載の方法、及び、それに準じた方法で製造することができる。
上記一般式(A)で表されるヘテロ環アミンのジアゾニウム化反応は、例えば、硫酸、リン酸、酢酸、塩酸、メタンスルホン酸などの酸性溶媒中、亜硝酸ナトリウム、ニトロシル硫酸、亜硝酸イソアミル等の試薬を15℃以下の温度で10分~6時間程度反応させることで行うことができる。
カップリング反応は、上述の方法で得られたジアゾニウム塩と上記一般式(B)で表される化合物とを40℃以下、好ましくは、25℃以下で10分~12時間程度反応させることで行うことができる。
このようにして反応させたものは、結晶が析出しているものもあるが、一般的には反応液に水、あるいはアルコール系溶媒を添加し、結晶を析出させ、結晶を濾取することができる。また、反応液にアルコール系溶媒、水等を添加して結晶を析出させて、析出した結晶を濾取することができる。濾取した結晶を必要に応じて洗浄・乾燥して、一般式(1)で表されるアゾ顔料を得ることができる。
溶媒加熱処理に使用される溶媒としては、例えば、水、トルエン、キシレン等の芳香族炭化水素系溶媒、クロロベンゼン、o-ジクロロベンゼン等のハロゲン化炭化水素系溶媒、イソプロパノール、イソブタノール等のアルコール系溶媒、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、N-メチル-2-ピロリドン等の極性非プロトン性有機溶媒、氷酢酸、ピリジン、又はこれらの混合物等が挙げられる。上記で挙げた溶媒に、更に無機又は有機の酸又は塩基を加えても良い。溶媒加熱処理の温度は所望する顔料の一次粒子径の大きさによって異なるが、40~150℃が好ましく、60~100℃が更に好ましい。また、処理時間は、30分~24時間が好ましい。
本発明におけるビニルポリマー粒子は、前記一般式(1)で表されるアゾ顔料、その互変異性体、それらの塩又は水和物、及びポリマー主鎖に連結基を介して結合した芳香環を有する疎水性構造単位(a)と、親水性構造単位(b)とを含むビニルポリマー(以下「樹脂」又は「特定樹脂」ともいう)を含有する。
本発明における顔料を含有するビニルポリマー粒子は、特定樹脂及び顔料等を用いて従来の物理的、化学的方法によって製造することができる。例えば、特開平9-151342号、特開平10-140065号、特開平11-209672号、特開平11-172180号、特開平10-25440号、又は特開平11-43636号の各公報に記載の方法により製造することができる。具体的には、特開平9-151342号及び特開平10-140065号の各公報に記載の転相法と酸析法等が挙げられ、中でも、分散安定性の点で転相法が好ましい。
特定樹脂がポリマー主鎖に連結基を介して結合した芳香環を有する疎水性構造単位(a)と、親水性構造単位(b)とを含むことが好ましい。
転相法は、基本的には、自己分散能又は溶解能を有する樹脂と顔料との混合溶融物を水に分散させる自己分散(転相乳化)させる方法であり、顔料を含有するビニルポリマー粒子を得ることができる。ここで、混合溶融物とは、溶解せず混合した状態、溶解して混合した状態、又はこれら両者の状態のいずれの状態を含むものをいう。「転相法」のより具体的な製造方法は、特開平10-140065号に記載の方法が挙げられる。
b)酸析法
酸析法は、樹脂と顔料とからなる含水ケーキを用意し、その含水ケーキ中の、樹脂が有するアニオン性基の一部又は全部を、塩基性化合物を用いて中和することによって、顔料を含有するビニルポリマー粒子を製造する方法である。
酸析法は、具体的には、(1)樹脂と顔料とをアルカリ性水性媒体中に分散し、必要に応じて加熱処理を行なって樹脂のゲル化を図る工程と、(2)pHを中性又は酸性にすることによって樹脂を疎水化して、樹脂を顔料に強く固着する工程と、(3)必要に応じて、濾過及び水洗を行って含水ケーキを得る工程と、(4)含水ケーキを中の、樹脂が有するアニオン性基の一部又は全部を、塩基性化合物を用いて中和し、その後、水性媒体中に再分散する工程と、(5)必要に応じて加熱処理を行い、樹脂のゲル化を図る工程と、を含む方法がある。
工程(1):既述の本発明における特定樹脂、有機溶媒、中和剤、顔料、及び水を含有する混合物を攪拌等により分散して分散物を得る工程
工程(2):前記分散物から前記有機溶媒を除去する工程
前記アルコール系溶媒としては、イソi-プロピルアルコール、n-ブタノール、t-ブタノール、エタノール等が挙げられる。前記ケトン系溶媒としては、アセトン、メチルエチルケトン、ジエチルケトン、メチルイソブチルケトン等が挙げられる。前記エーテル系溶媒としては、ジブチルエーテル、ジオキサン等が挙げられる。これらの溶媒の中では、メチルエチルケトン等のケトン系溶媒とイソi-プロピルアルコール等のアルコール系溶媒が好ましく、メチルエチルケトンが最も好ましい。
なお、より具体的には、特開平11-2096722号公報及び特開平11-172180号の記載を参照することができる。
顔料を含有するビニルポリマー粒子の平均粒子径及び粒径分布は、ナノトラック粒度分布測定装置UPA-EX150(日機装(株)製)を用いて、動的光散乱法により体積平均粒径を測定することにより求められるものである。
本発明のインクジェット記録用水性インクは水溶性溶媒を必須成分として含む。水溶性溶媒としては、水溶性有機溶剤が挙げられる。水溶性有機溶剤は乾燥防止剤、湿潤剤あるいは浸透促進剤の目的で使用される。
ノズルのインク噴射口において該インクジェット用インクが乾燥することによる目詰まりを防止する目的で乾燥防止剤が用いられ、乾燥防止剤や湿潤剤としては、水より蒸気圧の低い水溶性有機溶剤が好ましい。また、インクジェット用インクを紙により良く浸透させる目的で浸透促進剤として、水溶性有機溶剤が好適に使用される。
水溶性有機溶媒の含有量としては、インクの全質量に対して5質量%以上60質量%以下、好ましくは、10質量%以上40質量%以下で使用される。
本発明に使用される水の添加量は特に制限は無いが、インクの全質量に対して好ましくは、10質量%以上99質量%以下であり、より好ましくは、30質量%以上80質量%以下である。更に好ましくは、50質量%以上70質量%以下である。
本発明のインクには、表面張力調整剤を含有することが好ましい。表面張力調整剤としてはノニオン、カチオン、アニオン、ベタイン界面活性剤が挙げられる。表面張力の調整剤の添加量は、インクジェットで良好に打滴するために、本発明のインクの表面張力を20~60mN/mに調整する量が好ましく、より好ましくは20~45mN/m、更に好ましくは25~40mN/mに調整できる量である。
本発明における界面活性剤としては、分子内に親水部と疎水部を合わせ持つ構造を有する化合物等が有効に使用することができ、アニオン性界面活性剤、カチオン性界面活性剤、両性界面活性剤、ノニオン性界面活性剤のいずれも使用することができる。更には、上記高分子物質(高分子分散剤)を界面活性剤としても使用することもできる。
ノニオン性界面活性剤の具体例としては、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンオクチルフェニルエーテル、ポリオキシエチレンオレイルフェニルエーテル、ポリオキシエチレンノニルフェニルエーテル、オキシエチレン・オキシプロピレンブロックコポリマー、t-オクチルフェノキシエチルポリエトキシエタノール、ノニルフェノキシエチルポリエトキシエタノール等が挙げられ、これらの1種、又は2種以上を選択することができる。
カチオン性界面活性剤としては、テトラアルキルアンモニウム塩、アルキルアミン塩、ベンザルコニウム塩、アルキルピリジウム塩、イミダゾリウム塩等が挙げられ、具体的には、例えば、ジヒドロキシエチルステアリルアミン、2-ヘプタデセニル-ヒドロキシエチルイミダゾリン、ラウリルジメチルベンジルアンモニウムクロライド、セチルピリジニウムクロライド、ステアラミドメチルピリジウムクロライド等が挙げられる。
本発明におけるインクジェット用液体組成物に添加する界面活性剤の量は、特に限定されるものではないが、1質量%以上であることが好ましく、より好ましくは1~10質量%、更に好ましくは1~3質量%である。
本発明のインクには、その他の添加剤を含有してもよい。その他の添加剤としては、例えば、紫外線吸収剤、褪色防止剤、防黴剤、pH調整剤、防錆剤、酸化防止剤、乳化安定剤、防腐剤、消泡剤、粘度調整剤、分散安定剤、キレート剤等の公知の添加剤が挙げられる。
本発明のインクには樹脂微粒子あるいはポリマーラテックスを含有してもよい。樹脂微粒子あるいはポリマーラテックスとしては、アクリル系樹脂、酢酸ビニル系樹脂、スチレン-ブタジエン系樹脂、塩化ビニル系樹脂、アクリル-スチレン系樹脂、ブタジエン系樹脂、スチレン系樹脂、架橋アクリル樹脂、架橋スチレン系樹脂、ベンゾグアナミン樹脂、フェノール樹脂、シリコーン樹脂、エポキシ樹脂、ウレタン系樹脂、パラフィン系樹脂、フッ素系樹脂等を用いることができる。アクリル系樹脂、アクリル-スチレン系樹脂、スチレン系樹脂、架橋アクリル樹脂、架橋スチレン系樹脂を好ましい例として挙げることができる。
樹脂微粒子の好ましい例として、自己分散性ポリマー微粒子を挙げることができる。自己分散性ポリマー微粒子とは、他の界面活性剤の不存在下に、ポリマー自身が有する官能基(特に、酸性基又はその塩)によって、水性媒体中で分散状態となりうる高分子ポリマーであって、遊離の乳化剤を含有しない高分子ポリマーの微粒子を意味する。ここで分散状態とは、水性媒体中に高分子ポリマーが液体状態で分散された乳化状態(エマルジョン)、及び、水性媒体中に高分子ポリマーが固体状態で分散された分散状態(サスペンジョン)の両方の状態を含むものである。本発明では高分子ポリマーが固体状態で分散された分散状態となりうる高分子ポリマーであることが好ましい。
本発明で好ましく用いられる自己分散性ポリマー微粒子は、自己分散性の観点から、親水性の構成単位と芳香族基含有モノマーに由来する構成単位とを含む高分子ポリマーを含むことが好ましい。
不飽和カルボン酸モノマーとして具体的には、アクリル酸、メタクリル酸、クロトン酸、イタコン酸、マレイン酸、フマル酸、シトラコン酸、2-メタクリロイルオキシメチルコハク酸等が挙げられる。不飽和スルホン酸モノマーとして具体的には、スチレンスルホン酸、2-アクリルアミド-2-メチルプロパンスルホン酸、3-スルホプロピル(メタ)アクリレート、ビス-(3-スルホプロピル)-イタコン酸エステル等が挙げられる。不飽和リン酸モノマーとして具体的には、ビニルホスホン酸、ビニルホスフェート、ビス(メタクリロキシエチル)ホスフェート、ジフェニル-2-アクリロイロキシエチルホスフェート、ジフェニル-2-メタクリロイロキシエチルホスフェート、ジブチル-2-アクリロイロキシエチルホスフェート等が挙げられる。分散安定性、吐出安定性の観点から、不飽和カルボン酸モノマーが好ましく、アクリル酸及びメタクリル酸がより好ましい。
芳香族基含有モノマーは、芳香族炭化水素に由来する芳香族基とエチレン性不飽和結合とを有するモノマーであることが好ましく、芳香族基含有(メタ)アクリレートモノマーであることがより好ましい。前記芳香族基含有モノマーとしては、例えば、フェノキシエチル(メタ)アクリレート、ベンジル(メタ)アクリレート、フェニル(メタ)アクリレート、スチレン系モノマー等が挙げられる。中でも、ポリマー鎖の親水性と疎水性のバランスとインク定着性の観点から、フェノキシエチル(メタ)アクリレート、ベンジル(メタ)アクリレート、及びフェニル(メタ)アクリレートから選ばれる少なくとも1種であることが好ましく、フェノキシエチル(メタ)アクリレートであることがより好ましく、フェノキシエチルアクリレートであることが特に好ましい。
自己分散性ポリマー微粒子は、例えば、芳香族基含有モノマーからなる構成単位と、解離性基含有モノマーからなる構成単位とから構成することができるが、必要に応じて、その他の構成単位を更に含んで構成することができる。
前記アルキル基含有モノマーとしては、例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、イソi-プロピル(メタ)アクリレート、n-プロピル(メタ)アクリレート、n-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、t-ブチル(メタ)アクリレート、ヘキシル(メタ)アクリレート、エチルヘキシル(メタ)アクリレート等のアルキル(メタ)アクリレート;ヒドロキシメチル(メタ)アクリレート、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、ヒドロキシペンチル(メタ)アクリレート、ヒドロキシヘキシル(メタ)アクリレート等の水酸基を有するエチレン性不飽和モノマー;ジメチルアミノエチル(メタ)アクリレート等のジアルキルアミノアルキル(メタ)アクリレート;N-ヒドロキシメチル(メタ)アクリルアミド、Nーヒドロキシエチル(メタ)アクリルアミド、N-ヒドロキシブチル(メタ)アクリルアミド等のN-ヒドロキシアルキル(メタ)アクリルアミド;N-メトキシメチル(メタ)アクリルアミド、N-エトキシメチル(メタ)アクリルアミド、N-(n-,イソ)ブトキシメチル(メタ)アクリルアミド、N-メトキシエチル(メタ)アクリルアミド、N-エトキシエチル(メタ)アクリルアミド、N-(n-、イソ)ブトキシエチル(メタ)アクリルアミド等のN-アルコキシアルキル(メタ)アクリルアミド等の(メタ)アクリルアミド等が挙げられる。
本発明における自己分散性ポリマー微粒子を構成する高分子ポリマーの分子量範囲は、質量平均分子量で、3000~20万であることが好ましく、5000~15万であることがより好ましく、10000~10万であることが更に好ましい。質量平均分子量を3000以上とすることで水溶性成分量を効果的に抑制することができる。また、質量平均分子量を20万以下とすることで、自己分散安定性を高めることができる。
自己分散性ポリマー微粒子を構成する高分子ポリマーは、ポリマーの親疎水性制御の観点から、芳香族基含有(メタ)アクリレートモノマーを共重合比率として15~90質量%とカルボキシル基含有モノマーとアルキル基含有モノマーとを含み、酸価が25~100であって、質量平均分子量が3000~20万であることが好ましく、芳香族基含有(メタ)アクリレートモノマーを共重合比率として15~80質量%とカルボキシル基含有モノマーとアルキル基含有モノマーとを含み、酸価が25~95であって、質量平均分子量が5000~15万であることがより好ましい。
自己分散性ポリマー微粒子の平均粒径は、10nm~1μmの範囲が好ましく、10~200nmの範囲がより好ましく、20~100nmの範囲が更に好ましく、20~50nmの範囲が特に好ましい。
自己分散性ポリマー微粒子の添加量はインクに対して、0.5~20質量%が好ましく、3~20質量%がより好ましく、5~15質量%が更に好ましい。
自己分散性ポリマー微粒子のガラス転移温度Tgは30℃以上であることが好ましく、40℃以上がより好ましく、50℃以上が更に好ましい。また、ポリマー粒子の粒径分布に関しては、特に制限は無く、広い粒径分布を持つもの、又は単分散の粒径分布を持つもの、いずれでもよい。また、単分散の粒径分布を持つポリマー微粒子を、2種以上混合して使用してもよい。
本発明には、プリント性を向上させる液体組成物を印字媒体に付与することが好ましい例として挙げることができる。
本発明に用いることができるプリント性を向上させる液体組成物の好ましい一例として、インクのpHを変化させることにより凝集物を生じさせる液体組成物を挙げることができる。このとき、液体組成物のpHは1~6であることが好ましく、pHは2~5であることがより好ましく、pHは3~5であることが更に好ましい。液体組成物の成分として、ポリアクリル酸、酢酸、グリコール酸、マロン酸、リンゴ酸、マレイン酸、アスコルビン酸、コハク酸、グルタル酸、フマル酸、クエン酸、酒石酸、乳酸、スルホン酸、オルトリン酸、ピロリドンカルボン酸、ピロンカルボン酸、ピロールカルボン酸、フランカルボン酸、ビリジンカルボン酸、クマリン酸、チオフェンカルボン酸、ニコチン酸、若しくはこれらの化合物の誘導体、又はこれらの塩等の中から選ばれることが好ましい。これらの化合物は、1種類で使用されてもよく、2種類以上併用されてもよい。
本発明のインクの表面張力は、20mN/m以上60mN/m以下であることが好ましい。より好ましくは、20mN以上45mN/m以下であり、更に好ましくは、25mN/m以上40mN/m以下である。
本発明のインクの20℃での粘度は、1.2mPa・s以上15.0mPa・s以下であることが好ましく、より好ましくは2mPa・s以上13mPa・s未満、更に好ましくは2.5mPa・s以上10mPa・s未満である。
本発明に好ましいインクジェット記録方法として、インクジェット記録用インクにエネルギーを供与して、公知の受像材料、即ち普通紙、樹脂コート紙、例えば特開平8-169172号公報、同8-27693号公報、同2-276670号公報、同7-276789号公報、同9-323475号公報、特開昭62-238783号公報、特開平10-153989号公報、同10-217473号公報、同10-235995号公報、同10-337947号公報、同10-217597号公報、同10-337947号公報等に記載されているインクジェット専用紙、フィルム、電子写真共用紙、布帛、ガラス、金属、陶磁器等に画像を形成する。なお、本発明に好ましいインクジェット記録方法として特開2003-306623号公報の段落番号0093~0105の記載が適用できる。
本発明のアゾ顔料は、下記顔料の合成例1で説明するPig.-1の合成方法に準じて合成することが可能である。
(顔料の合成)例示化合物(Pig.-1)の合成
例示化合物(Pig.-1)の合成スキームを下記に示す。
シアノ酢酸メチル29.7g(0.3モル)にオルトギ酸トリメチル42.4g(0.4モル)、無水酢酸20.4g(0.2モル)、p-トルエンスルホン酸0.5gを加えて110℃(外温)に加熱し、反応系から生じる低沸点成分を留去しながら20時間攪拌した。この反応液を減圧濃縮した後、シリカゲルカラム精製を行い前記中間体(a)を14.1g(黄色粉末、収率30%)で得た。得られた中間体(a)のNMR測定結果は以下の通りである。1H-NMR(300MHz、CDCl3)7.96(s,1H),4.15(s,3H),3.81(s,3H)
メチルヒドラジン7.4mL(141ミリモル)にイソプロパノール150mLを加えて15℃(内温)に冷却し、この混合液に中間体(a)7.0g(49.6ミリモル)を徐々に添加した後、50℃に加熱して1時間40分攪拌した。この反応液を減圧濃縮した後、シリカゲルカラム精製を行い前記中間体(b)を10.5g(白色粉末、収率50%)で得た。得られた中間体(b)のNMR測定結果は以下の通りである。1H-NMR(300MHz、CDCl3)7.60(s,1H),4.95(brs,2H),3.80(s,3H)3.60(s,3H)
ヒドラジン1水和物130mLにメタノール100mLを加えて10℃(内温)に冷却し、この混合液に4,6-ジクロロピリミジン50.0g(336ミリモル)を徐々に添加(内温20℃以下)した後、50℃に加熱して4時間30分攪拌した。反応液から析出した結晶をろ取、イソプロパノールでかけ洗い後、乾燥を行い前記中間体(c)を43.1g(白色粉末、収率92%)で得た。得られた中間体(c)のNMR測定結果は以下の通りである。1H-NMR(300MHz、d-DMSO)7.82(s,1H),7.55(s,2H),5.96(s,1H),4.12(s,4H)
中間体(c)35.0g(0.25モル)、ピバロイルアセトニトリル68.8g(0.55モル)に水900mLを加えて室温で攪拌した。この懸濁液に1M塩酸水をpH3になるように滴下した後、50℃に加熱して8時間攪拌した。この反応液に8M水酸化カリウム水溶液を滴下してpH8に調整して、更に1M塩酸水を滴下してpH6に調整して析出した結晶をろ取、イソプロパノールでかけ洗い後、乾燥を行い前記中間体(d)を83.0g(白色粉末、収率94%)で得た。得られた中間体(d)のNMR測定結果は以下の通りである。1H-NMR(300MHz、d-DMSO)8.73(s,1H),7.97(s,1H),6.88(s,4H),5.35(s,2H),1.22(s,18H)
濃硫酸4.1mLに酢酸18.5mLを加えて氷冷で攪拌し、40%ニトロシル硫酸3.85g(12.1ミリモル)を滴下した。この混合液に中間体(b)1.71g(11.0ミリモル)を徐々に添加(内温0℃以下)した後、0℃で2時間攪拌した。この反応液に尿素150mgを添加し、更に0℃で15分攪拌して、ジアゾ液Aを調製した。
中間体(d)にメタノール50mLを加えて加熱溶解させた後、氷冷で攪拌した混合液に前記ジアゾ液Aをゆっくり滴下した(内温10℃以下)。この反応液を室温で2時間攪拌した後、析出した結晶をろ取、メタノールでかけ洗いして前記例示化合物(Pig.-1)の粗結晶を得た。更に前記粗結晶に水を加えて攪拌した後、この懸濁液を水酸化ナトリウム水溶液でpH7に調整し、更にジメチルアセトアミド20mLを加えて、80℃で2時間攪拌した。析出した結晶をろ取、更にメタノールで懸濁洗浄し得られた結晶をろ取、乾燥して例示化合物(Pig.-1)を2.0g(黄色粉末、収率79%)で得た。
(ビニルポリマーの合成)
下記モノマー組成の成分を全量が100質量部になるように混合し、更に重合開始剤として2,2’-アゾビス(2,4-ジメチルバレロニトリル)1質量部添加し、窒素ガス置換を十分に行い、合成混合液を得た。
メチルメタクリレート 35質量部
メタクリル酸 10質量部
2-メルカプトエタノール 0.1質量部
得られた50%ビニルポリマー溶液10質量部に5mol/L水酸化ナトリウム水溶液を加えて中和した。なお、ビニルポリマーのメタクリル酸あるいはアクリル酸を完全中和するアルカリ量を添加した。本発明の顔料例示化合物(Pig.-1)10質量部を加え、ロールミルで必要に応じて2~8時間混練した。混練物をイオン交換水100質量部に分散した。得られた分散物から減圧下、55℃で有機溶媒を完全に除去し、更に水を除去することにより濃縮し、固形分濃度が15質量%の顔料含有ビニルポリマー粒子の水分散体を得た。
本発明のビニルポリマーは、表1に記載の組成で上記の合成例と同様の方法で合成した。
攪拌機、温度計、還流冷却管、及び窒素ガス導入管を備えた2リットル三口フラスコに、メチルエチルケトン350.0gを仕込んで、75℃まで昇温した。反応容器内温度を75℃に保ちながら、フェノキシエチルアクリレート162.0g、メチルメタクリレート180.0g、アクリル酸18.0g、メチルエチルケトン70g、及び「V-601」(和光純薬(株)製)1.44gからなる混合溶液を、2時間で滴下が完了するように等速で滴下した。滴下完了後、「V-601」0.72g、メチルエチルケトン36.0gからなる溶液を加え、75℃で2時間攪拌後、更に「V-601」0.72g、イソプロパノール36.0gからなる溶液を加え、75℃で2時間攪拌した後、85℃に昇温して、更に2時間攪拌を続けた。得られた共重合体の質量平均分子量(Mw)は64000(ゲルパーミエーションクロマトグラフィー(GPC)によりポリスチレン換算で算出、使用カラムはTSKgel SuperHZM-H、TSKgel SuperHZ4000、TSKgel SuperHZ200(東ソー社製))、酸価は38.9(mgKOH/g)であった。
次に、重合溶液668.3gを秤量し、イソプロパノール388.3g、1mol/L NaOH水溶液145.7mlを加え、反応容器内温度を80℃に昇温した。次に蒸留水720.1gを20ml/minの速度で滴下し、水分散化せしめた。その後、大気圧下にて反応容器内温度80℃で2時間、85℃で2時間、90℃で2時間保った後、反応容器内を減圧にし、イソプロパノール、メチルエチルケトン、蒸留水を合計で913.7g留去し、固形分濃度28.0%の自己分散性ポリマー微粒子(B-01)の水分散物(エマルジョン)を得た。
グリセリン 5質量部
ジエチレングリコール 5質量部
トリエチレングリコールモノブチルエーテル 5質量部
ポリオキシプロピレングリセリルエーテル 10質量部
ジプロピレングリコール 5質量部
トリエタノールアミン 1質量部
オルフィンE1010(日信化学工業(株)製) 1質量部
自己分散性ポリマー微粒子(B-01)の水分散物 15質量部
イオン交換水 28質量部
上記を混合しインク組成物を得た。
東亜DKK(株)製pHメータ-WM-50EGにて、インク組成物のpHを測定したところ、pHは8.5であった。
表1に示す顔料インク組成物をPET製容器に密栓し58℃環境下に4週間経時した。インクジェット記録装置として、富士フイルムDimatix社製DMP-2831プリンターを用い、インク液滴量2pLで吐出周波数20kHz、ノズル配列列方向×搬送方向16×1200dpiで10cmライン印字した。記録媒体として富士フイルム社製画彩写真仕上げProを用いた。印字サンプルの打滴開始部から5cmの部位のライン間の距離を王子計測機器製ドットアナライザイーDA-6000で測定し、その標準偏差を算出し、吐出の方向精度を評価した。
A・・・標準偏差が3μm未満
B・・・標準偏差が3μm以上4μm未満
C・・・標準偏差が4μm以上4.55μm未満
D・・・標準偏差が4.5μm以上5μm未満
E・・・標準偏差が5μm以上
顔料としてC.I.ピグメントイエロー74顔料及び本発明の顔料例示化合物(Pig.-1)を用い、特開2000-239594号公報の段落番号[0053]~[0059]に記載の合成例にしたがってビニルポリマーを合成して分散液を作製し、本発明の実施例1の方法に従ってこれを含有する水系インクを調製した。
上記インクについて、本発明の実施例1の方法に従い吐出精度を評価した。結果を表2に示す。
メタクリル酸n-ブチル 35質量%
アクリル酸n-ブチル 10質量%
メタクリル酸2-ヒドロキシエチル 15質量%
メタクリル酸 20質量%
スチレン 20質量%
分散剤2:下記モノマーの共重合体
メタクリル酸n-ブチル 35質量%
アクリル酸n-ブチル 10質量%
メタクリル酸2-ヒドロキシエチル 15質量%
メタクリル酸 20質量%
スチレン 20質量%
実施例1の実験106~110における高分子ポリマーの疎水性構造単位のベンジルメタクリレートを表3に記載の組成でフェノキシエチルアクリレート、あるいはベンジルアクリレートに変更し、上記の合成例1と同様の方法で合成した。それ以外は実験106~110と同様にしてインクジェット記録用水性インクを作製し、実施例1と同様にして吐出精度を評価したところ、表3に記載のように実験106~110と同等の良好な性能を示した。
表4に記載の顔料及び高分子ポリマーを用いて、実施例1~実施例2においてインクジェット記録用水性インクをPET製容器に密栓して58℃環境下に4週間保存する代わりに、高密度ポリエチレン容器に密栓して室温で4ヶ月保存した後に、実施例1と同様にして吐出精度を評価したところ、本発明のインクジェット記録用水性インクは、表4に記載のように実施例1~実施例2と同等の良好な性能が得られることが確認できた。
表5に記載の顔料及び高分子ポリマーを用いて、実施例1~実施例3において水性インクの調製で自己分散性ポリマー微粒子(B-01)の水分散物をイオン交換水に置き換えたインクを調製し、それ以外は実施例1~実施例3と同様にしてインクジェット記録用水性インクを作製し、実施例1と同様にして吐出精度を評価したところ、本発明のインクジェット記録用水性インクは、表5に記載のように、実施例1~実施例3と同等の良好な性能を示した。
実施例1~実施例3において、記録媒体として富士フイルム社製画彩写真仕上げProを用いる代わりに、日本製紙(株)製の「ユーライト」、富士ゼロックス(株)製の「Xerox 4024」、王子製紙製「OKプリンス上質」、日本製紙製「しおらい」、王子製紙製「OKエバーライトコート」、日本製紙製「オーロラコート」、又は三菱製紙製「特菱アート」を用いて実施例1と同様にして吐出精度を評価したところ、本発明のインクジェット記録用水性インクを用いた場合には、実施例1~実施例3と同様に良好な性能が得られることが確認できた。
本出願は、2008年8月29日出願の日本特許出願(特願2008-222808)及び2009年8月5日出願の日本特許出願(特願2009-182748)に基づくものであり、その内容はここに参照として取り込まれる。
Claims (14)
- A及びBを含有するビニルポリマー粒子及び水溶性溶媒を含むことを特徴とするインクジェット記録用水性インク。
A:下記一般式(1)で表されるアゾ顔料、その互変異性体、それらの塩又は水和物
B:ポリマー主鎖に連結基を介して結合した芳香環を有する疎水性構造単位(a)と、親水性構造単位(b)とを含むビニルポリマー
(一般式(1)中、Qは炭素原子と共に5~7員のヘテロ環を表し、Wはアルコキシ基、アミノ基、アルキル基又はアリール基を表し、X1、X2はそれぞれ独立に水素原子、アルキル基、アシル基、アルキルスルホニル基又はアリールスルホニル基を表し、R1は水素原子又は置換基を表し、R2はヘテロ環基を表し、nは1~4の整数を表す。n=2の場合は、Q、W、X1、X2、R1、又はR2を介した2量体を表す。n=3の場合は、Q、W、X1、X2、R1、又はR2を介した3量体を表す。n=4の場合は、Q、W、X1、X2、R1、又はR2を介した4量体を表す。) - 前記疎水性構造単位(a)が更に、アクリル酸又はメタクリル酸の、アルキルエステルに由来する疎水性構造単位(a2)を含むことを特徴とする請求項1又は2に記載のインクジェット記録用水性インク。
- 前記疎水性構造単位(a)がフェノキシエチル(メタ)アクリレートに由来の構造単位及びベンジル(メタ)アクリレートに由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して20質量%以上含み、前記親水性構造単位(b)がアクリル酸及びメタクリル酸に由来の構造単位より選択される少なくとも一つを総量でビニルポリマー全質量に対して30質量%以下含むことを特徴とする請求項1~3のいずれかに記載のインクジェット記録用水性インク。
- 前記疎水性構造単位(a)が、フェノキシエチル(メタ)アクリレートに由来の構造単位を総量でビニルポリマー全質量に対して20質量%以上含むことを特徴とする請求項1~4のいずれかに記載のインクジェット記録用水性インク。
- 一般式(1)中、Qが炭素原子と共に5員含窒素ヘテロ環を形成することを特徴とする請求項1~6のいずれかに記載のインクジェット記録用水性インク。
- 一般式(1)中のnが2であることを特徴とする請求項1~7のいずれかに記載のインクジェット記録用水性インク。
- 一般式(2)中のX1が水素原子であることを特徴とする請求項6~8のいずれかに記載のインクジェット記録用水性インク。
- W、W1、W2が、それぞれ独立に総炭素数3以下のアルコキシ基、アミノ基、総炭素数3以下のアルキルアミノ基であることを特徴とする請求項1~11のいずれかに記載のインクジェット記録用水性インク。
- G、G1、G2が、それぞれ独立に総炭素数3以下のアルキル基であることを特徴とする請求項10又は11に記載のインクジェット記録用水性インク。
- Zが、6員含窒素ヘテロ環であることを特徴とする請求項11~13のいずれかに記載のインクジェット記録用水性インク。
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AU2009285047A AU2009285047B2 (en) | 2008-08-29 | 2009-08-27 | Azo-pigment-containing water-based ink for inkjet recording |
EP20090809967 EP2330164B1 (en) | 2008-08-29 | 2009-08-27 | Azo-pigment-containing water-based ink for inkjet recording |
CA2737256A CA2737256C (en) | 2008-08-29 | 2009-08-27 | Azo pigment-containing aqueous ink for inkjet recording |
US13/061,253 US8399545B2 (en) | 2008-08-29 | 2009-08-27 | Azo pigment-containing aqueous ink for inkjet recording |
CN2009801429100A CN102197099B (zh) | 2008-08-29 | 2009-08-27 | 含偶氮颜料的喷墨记录用水性墨液 |
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JP2009242488A (ja) * | 2008-03-28 | 2009-10-22 | Fujifilm Corp | アゾ顔料および該アゾ顔料の製造方法、該顔料を含む顔料分散物、着色組成物及びインクジェット記録用インク |
JP2010065212A (ja) * | 2008-08-14 | 2010-03-25 | Fujifilm Corp | インクジェット記録用水性インク |
WO2011027841A1 (ja) * | 2009-09-04 | 2011-03-10 | 富士フイルム株式会社 | 水系顔料分散物及びインクジェット記録用水性インク |
JP2011074377A (ja) * | 2009-09-04 | 2011-04-14 | Fujifilm Corp | 水系顔料分散物及びインクジェット記録用水性インク |
US8609747B2 (en) | 2009-09-04 | 2013-12-17 | Fujifilm Corporation | Aqueous pigment dispersion and aqueous ink for ink jet recording |
WO2012105704A1 (ja) * | 2011-02-04 | 2012-08-09 | 富士フイルム株式会社 | 水系顔料分散物、その製造方法及びインクジェット記録用インク |
JP2012177110A (ja) * | 2011-02-04 | 2012-09-13 | Fujifilm Corp | 水系顔料分散物、その製造方法及びインクジェット記録用インク |
CN103354828A (zh) * | 2011-02-04 | 2013-10-16 | 富士胶片株式会社 | 水系颜料分散物及其制造方法以及喷墨记录用墨水 |
EP2671926A4 (en) * | 2011-02-04 | 2015-07-22 | Fujifilm Corp | AQUEOUS PIGMENT DISPERSION AND MANUFACTURING METHOD AND INK FOR INKJET PRINTING |
CN103717680A (zh) * | 2011-07-29 | 2014-04-09 | 富士胶片株式会社 | 包括偶氮颜料、着色组合物、喷墨记录油墨的分散体和制备分散体的方法 |
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EP2330164A4 (en) | 2012-04-04 |
CA2737256C (en) | 2016-01-26 |
JP5469951B2 (ja) | 2014-04-16 |
US8399545B2 (en) | 2013-03-19 |
EP2330164A1 (en) | 2011-06-08 |
AU2009285047B2 (en) | 2013-12-19 |
CA2737256A1 (en) | 2010-03-04 |
CN102197099A (zh) | 2011-09-21 |
KR20110049892A (ko) | 2011-05-12 |
US20110166267A1 (en) | 2011-07-07 |
AU2009285047A1 (en) | 2010-03-04 |
CN102197099B (zh) | 2013-11-06 |
EP2330164B1 (en) | 2013-03-13 |
JP2010077400A (ja) | 2010-04-08 |
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