WATER-BASED INKJET INK AND METHOD FOR PRODUCING INKJET PRINTED MATERIAL

Abstract

An embodiment relates to an inkjet ink containing a mixed crystal pigment including two or more naphthol-based azo pigments, a binder resin (a-1) having an acid value of 1 to 80 mgKOH/g, a surfactant, and a water-soluble organic solvent, in which the amount of a water-soluble organic solvent having a boiling point of 240° C. or more at 1 atmosphere is 8% by mass or less relative to the total amount of the water-based inkjet ink.

Claims

1. A water-based inkjet ink comprising a colorant, a binder resin (A), a surfactant, and a water-soluble organic solvent, wherein the colorant includes a mixed crystal pigment containing two or more naphthol-based azo pigments, the binder resin (A) includes a binder resin (a-1) having an acid value of 1 to 80 mgKOH/g, and an amount of a water-soluble organic solvent having a boiling point of 240° C. or more at 1 atmosphere is 8% by mass or less relative to a total amount of the water-based inkjet ink.

2. The water-based inkjet ink according to claim 1, wherein the binder resin (a-1) includes at least one type of resin selected from the group consisting of a (meth)acrylic resin, a styrene-(meth)acrylic resin, a urethane resin, a urethane-(meth)acrylic composite resin, and a polyolefin resin.

3. The water-based inkjet ink according to claim 1, wherein the binder resin (a-1) includes a polyolefin resin, and at least one type of resin selected from the group consisting of a (meth)acrylic resin and a styrene-(meth)acrylic resin.

4. The water-based inkjet ink according to claim 1, wherein the water-soluble organic solvent includes an alkanediol of 2 to 5 carbon atoms.

5. The water-based inkjet ink according to claim 1, wherein a total amount of a nitrogen-containing compound having a pKa value of 2 or less at 25° C. and a nitrogen-containing compound having a pKa value of 10 or more at 25° C. is 3% by mass or less relative to a total amount of the water-based inkjet ink.

6. The water-based inkjet ink according to claim 1, wherein the two or more naphthol-based azo pigments include a compound having a structure represented by general formula (1) shown below, General formula (1): ##STR00007## wherein, in general formula (1), R.sup.1, R.sup.2, and R.sup.3 are each independently any one of a hydrogen atom, an alkyl group of 1 to 2 carbon atoms, an alkoxy group of 1 to 2 carbon atoms, an anilide group, a carbamoyl group, a methoxycarbonyl group, an ethoxycarbonyl group, an amino group, a nitro group, a sulfonamide group, a methylaminosulfonyl group, or an ethylaminosulfonyl group, and R.sup.4 is any one of a hydrogen atom, an alkyl group of 1 to 2 carbon atoms, or a group having a structure represented by general formula (2) shown below, General formula (2): ##STR00008## wherein, in general formula (2), R.sup.5 is any one of a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group of 1 to 2 carbon atoms, an alkoxy group of 1 to 2 carbon atoms, an amino group, or a nitro group, R.sup.6 and R.sup.7 are each independently any one of a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group of 1 to 2 carbon atoms, an alkoxy group of 1 to 2 carbon atoms, an amino group, or a nitro group, or R.sup.6 and R.sup.7 are bonded to each other to form an imidazolidinone ring, and a position of * is a bonding site.

7. The water-based inkjet ink according to claim 1, wherein the two or more naphthol-based azo pigments include a compound having a structure represented by general formula (3) shown below, General formula (3): ##STR00009## wherein, in general formula (3), R.sup.4 is any one of a hydrogen atom, an alkyl group of 1 to 2 carbon atoms, or a group having a structure represented by general formula (2) shown below, General formula (2): ##STR00010## wherein, in general formula (2), R.sup.5 is any one of a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group of 1 to 2 carbon atoms, an alkoxy group of 1 to 2 carbon atoms, an amino group, or a nitro group, R.sup.6 and R.sup.7 are each independently any one of a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group of 1 to 2 carbon atoms, an alkoxy group of 1 to 2 carbon atoms, an amino group, or a nitro group, or R.sup.6 and R.sup.7 are bonded to each other to form an imidazolidinone ring, and a position of * is a bonding site.

8. The water-based inkjet ink according to claim 1, wherein the two or more naphthol-based azo pigments include C.I. Pigment Red 150.

9. The water-based inkjet ink according to claim 1, wherein the two or more naphthol-based azo pigments include 10 to 80% by mole of C.I. Pigment Red 150 in a total amount of the naphthol-based pigments.

10. A method for producing an inkjet printed material comprising discharging and applying the water-based inkjet ink according to claim 1 from an inkjet head onto a recording medium.

Description

EXAMPLES

[0212] The present invention is described below in further detail using a series of examples and comparative examples. Note that, in the following description, unless specifically stated otherwise, “parts” and “%” represent “parts by mass” and “% by mass”, respectively.

Production Example for Naphthol-Based Mixed Crystal Pigment 1

[0213] As the base component, 23.4 parts of 3-amino-4-methoxybenzanilide were added to 364.4 parts of water, stirred thoroughly to prepare a suspension, and then ice was added to adjust the liquid temperature to 5° C. Next, 39.7 parts of 35% hydrochloric acid were added to the suspension and stirred for 1 hour. Thereafter, an aqueous solution of 7.1 parts of sodium nitrite dissolved in 22 parts of water was added and stirred for 1 hour to thereby perform diazotization. Next, 1 part of sulfamic acid was added to the reaction mixture to dissipate the nitrite, after which an aqueous solution composed of 20.7 parts of sodium acetate, 1.8 parts of acetic acid, and 165 parts water was added to make a diazonium aqueous solution.

[0214] Meanwhile, as a coupler component, 18.0 parts of 3-hydroxy-2-naphthamide and 2.0 parts of N-(5-chloro-2-methoxyphenyl)-3-hydroxy-2-naphthamide were added to 31.8 parts of a 25% sodium hydroxide aqueous solution and 414 parts of water, and stirred thoroughly to dissolve completely and thereby prepare a coupler aqueous solution.

[0215] Then, the coupler aqueous solution was added to the diazonium aqueous solution prepared above, and the mixture was stirred for 1 hour to complete the reaction, after which the slurry mixture was heated to 70° C. and, in addition, filtered and washed to thereby obtain a press cake of a pigment composition, which is a naphthol-based mixed crystal pigment. In addition, this press cake was dried under conditions of 90° C. and 18 hours, and was then ground to obtain a naphthol-based mixed crystal pigment 1.

Production Examples for Naphthol-Based Mixed Crystal Pigments 2 to 13

[0216] Naphthol-based mixed crystal pigments 2 to 13 were produced in the same way as the naphthol-based mixed crystal pigment 1 described above, except that the base component and the coupler component were altered as shown in Table 1.

TABLE-US-00001 TABLE 1 Naphthol-based mixed crystal pigment No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Base TM-40 23.4 23.4 23.4 23.4 23.4 23.4 23.4 23.4 23.4 23.4 23.4 11.7 component TM-20 23.4 2M-5NA 11.8 Coupler Bonamide 18 14 9 6 1 15 10 8 10 9 11 component Naphthol 2 6 11 14 19 AS-CA Naphthol 5 10 12 20 AS-BS Naphthol 10 AS Naphthol 8 10 AS-LC Naphthol AS-BI Naphthol 8 10 AS-KB PR150 in mixed 94.0% 80.3% 58.9% 42.9% 8.4% 83.2% 62.2% 52.3% 58.4% 68.3% 69.6% — — crystal pigment (mol %)

[0217] Note that the abbreviations for compounds used in Table 1 are as follows. Furthermore, Table 1 also lists the blend amount of C.I. Pigment Red 150 in the naphthol-based mixed crystal pigments (except for naphthol-based mixed crystal pigments 12 and 13 which do not contain C.I. Pigment Red 150 as a constituent element). [0218] TM-40: 3-amino-4-methoxybenzanilide [0219] TM-20: 3-amino-4-methoxybenzamide [0220] 2M-5NA: 2-methoxy-5-nitroaniline [0221] Bonamide: 3-hydroxy-2-naphthamide [0222] Naphthol AS: 3-hydroxy-N-phenyl-2-naphthamide [0223] Naphthol AS-BS: 3-hydroxy-3′-nitro-2-naphthanilide [0224] Naphthol AS-LC: N-(4-chloro-2,5-dimethoxyphenyl)-3-hydroxy-2-naphthamide [0225] Naphthol AS-BI: 5-(2-hydroxy-3-naphthoylamino)-1H-benzimidazole-2(3H)-one [0226] Naphthol AS-CA: N-(5-chloro-2-methoxyphenyl)-3-hydroxy-2-naphthamide [0227] Naphthol AS-KB: 5′-chloro-3-hydroxy-2′-methyl-2-naphthanilide

[0228] Furthermore, the correspondence between the structures of the naphthol-based mixed crystal pigments 1 to 13 and the C.I. Pigment No. is shown in Table 2.

TABLE-US-00002 TABLE 2 Naphthol-based mixed crystal pigment No. 1 2 3 4 5 6 7 8 9 10 Naphthol- C.I. Pigment No. Red 150 Red 150 — Red 150 based R.sup.1 Methoxy group Methoxy group Methoxy group Methoxy group pigment R.sup.2 Hydrogen atom Hydrogen atom Hydrogen atom Hydrogen atom constituting R.sup.3 Anilide group Anilide group Carbamoyl group Anilide group mixed crystal R.sup.4 Hydrogen atom Hydrogen atom Hydrogen atom Hydrogen atom pigment (When R4 is R.sup.5 (First type) structure R.sup.6 represented R.sup.7 by general formula (2)) Naphthol- C.I. Pigment No. Red 269 Red 31 Red 245 Red 146 based R.sup.1 Methoxy group Methoxy group Methoxy group Methoxy group pigment R.sup.2 Hydrogen atom Hydrogen atom Hydrogen atom Hydrogen atom constituting R.sup.3 Anilide group Anilide group Carbamoyl group Anilide group mixed crystal R.sup.4 Structure Structure Structure Structure pigment represented represented represented represented (Second type) by general by general by general by general formula (2) formula (2) formula (2) formula (2) (When R4 R.sup.5 Methoxy group Hydrogen atom Hydrogen atom Methoxy group is structure R.sup.6 Hydrogen atom Hydrogen atom Hydrogen atom Chlorine atom represented R.sup.7 Chlorine atom Nitro group Hydrogen atom Methoxy group by general formula (2)) z z z z z z z z z z z z z Naphthol-based mixed crystal pigment No. 11 12 13 Naphthol- C.I. Pigment No. Red 150 Red 146 Red 23 based R.sup.1 Methoxy group Methoxy group Methoxy group pigment R.sup.2 Hydrogen atom Hydrogen atom Hydrogen atom constituting R.sup.3 Anilide group Anilide group Nitro group mixed crystal R.sup.4 Hydrogen atom Structure Structure pigment represented represented (First type) by general by general formula (2) formula (2) (When R4 is R.sup.5 Methoxy group Hydrogen atom structure R.sup.6 Chlorine atom Hydrogen atom represented R.sup.7 Methoxy group Nitro group by general formula (2)) Naphthol- C.I. Pigment No. Red 147 Red 31 based R.sup.1 Methoxy group Methoxy group pigment R.sup.2 Hydrogen atom Hydrogen atom constituting R.sup.3 Anilide group Anilide group mixed crystal R.sup.4 Structure Structure pigment represented represented (Second type) by general by general formula (2) formula (2) (When R4 R.sup.5 Methyl group Hydrogen atom is structure R.sup.6 Hydrogen atom Hydrogen atom represented R.sup.7 Chlorine atom Nitro group by general formula (2)) z z z z z z

[0229] Note that the naphthol-based mixed crystal pigments 1 to 13 were all confirmed to be mixed crystal by X-ray diffraction analysis using an X-ray diffraction device (X'Pert PRO MRD) manufactured by Panalytical Ltd.

Production Example for Pigment Dispersing Resin

[0230] A reaction container fitted with a gas inlet tube, a thermometer, a condenser, and a stirrer was charged with 93.4 parts of butanol, and the reaction container was flushed with nitrogen gas. The inside of the reaction container was heated to 110° C., and a mixture of 30 parts of acrylic acid, 35 parts of styrene, and 35 parts of lauryl methacrylate as polymerizable monomers, and 6 parts of V-601 (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator was added dropwise over 2 hours to perform a polymerization reaction. Following completion of the dropwise addition, the reaction was carried out for 3 hours at 110° C., after which 0.6 parts of V-601 was added, and the reaction was continued for a further 1 hour at 110° C. Thereafter, the reaction system was cooled to room temperature, 39 parts of dimethylaminoethanol was added to perform neutralization, and then 100 parts of water was added. Thereafter, the mixed solution was heated to at least 100° C. and butanol was distilled, and water was used to adjust the solid fraction to 30%, thereby obtaining an aqueous solution of a pigment dispersing resin (solid fraction: 30%). Note that the weight average molecular weight of the pigment dispersing resin was 16,000 and the acid value was 230, measured by the methods described above.

Production Example for Magenta Pigment Dispersion 1

[0231] An amount of 20 parts of the naphthol-based mixed crystal pigment 1, 20 parts of a water-based solution of pigment dispersing resin (solid fraction: 30%), and 60 parts of water were sequentially introduced into a mixing container equipped with a stirrer, and then premixing was performed. Thereafter, main dispersion was carried out using a Dyno Mill having a capacity of 0.6 L filled with 1800 g of zirconia beads having a 0.5 mm diameter, thereby obtaining by a magenta pigment dispersion 1 (pigment concentration: 20%).

[0232] Note that “water-based solution” mentioned above means a solution containing an aqueous solvent and a component dispersed and/or dissolved in the aqueous solvent.

Production Examples for Magenta Pigment Dispersions 2 to 18

[0233] Magenta pigment dispersions 2 to 13 (all having a pigment concentration of 20%) were produced in the same way as the magenta pigment dispersion 1, except that the naphthol-based mixed crystal pigments 2 to 13 were used as pigments. Furthermore, magenta pigment dispersions 14 to 18 (all having a pigment concentration of 20%) were obtained in the same way as the magenta pigment dispersion 1 described above, except that the pigments listed below were used. [0234] Magenta pigment dispersion 14: Toshiki Red 150TR (C.I. Pigment Red 150 manufactured by Tokyo Shikizai Industry Co., Ltd.) [0235] Magenta pigment dispersion 15: Toshiki Red 269N (C.I. Pigment Red 269 manufactured by Tokyo Shikizai Industry Co., Ltd.) [0236] Magenta pigment dispersion 16: Toshiki Red 31N (C.I. Pigment Red 31 manufactured by Tokyo Shikizai Industry Co., Ltd.) [0237] Magenta pigment dispersion 17: FASTGEN SUPER MAGENTA RG (C.I. Pigment Red 122 manufactured by DIC Corporation) [0238] Magenta pigment dispersion 18: FASTGEN SUPER MAGENTA RY (quinacridone solid solution manufactured by DIC Corporation)

Production Examples for Binder Resins 1 to 8 ((Meth)Acrylic Water-Soluble Resin, Styrene-(Meth)Acrylic Water-Soluble Resin)

[0239] With the exception of altering, as shown in Table 3, the composition of the mixture added dropwise to butanol (types and amounts of the polymerizable monomers, and the amount of V-601), the amount of V-601 added after reacting for 3 hours at 110° C., and the amount of dimethylaminoethanol used for neutralization, aqueous solutions of binder resins 1 to 8 (solid fraction: 30%), which are (meth)acrylic water-soluble resins or styrene-(meth)acrylic water-soluble resins, were obtained using the same operations as those described for the pigment dispersing resins above.

TABLE-US-00003 TABLE 3 Parameter of binder resin Producing condition Glass Polymerizable monomer V-601 amount V-601 amount Dimethylamino transition Weight average amount added (parts) added firstly subsequently ethanol amount Acid value temperature molecular St MAA MMA BA STMA (parts) added (parts) (parts) (mgKOH/g) (° C.) weight Binder resin 1 2 88 10 6 0.6 2.2 12 80 15,000 Binder resin 2 6 84 10 9 0.9 6.6 38 82 8,500 Binder resin 3 9 81 10 6 0.6 9.9 57 83 14,000 Birder resin 4 12 78 10 6 0.6 13.2 77 85 14,000 Binder resin 5 15 75 10 6 0.6 16.5 95 86 13,000 Binder resin 6 30 5 30 30 5 6 0.6 5.5 30 34 16,500 Binder resin 7 20 5 5 70 1.5 0.15 5.5 31 −20 38,000 Binder resin 8 10 10 35 45 6 0.6 11.0 62 13 15,500

[0240] Note that the acid values, glass transition temperatures, and weight average molecular weights of binder resins 1 to 8 are also given in Table 3. Furthermore, the abbreviations for polymerizable monomers given in Table 2 are as follows. [0241] St: styrene [0242] MAA: methacrylic acid [0243] MMA: methyl methacrylate [0244] BA: butyl acrylate [0245] STMA: stearyl methacrylate

Production Examples for Binder Resins 9 to 11 (Styrene-(Meth)Acrylic Resin Microparticles)

[0246] A reaction container fitted with a gas inlet tube, a thermometer, a condenser, and a stirrer was charged with 40 parts of water and 0.2 parts of AQUALON KH-10 (manufactured by DKS Co. Ltd.) as a surfactant, to produce a surfactant aqueous solution. Furthermore, 50 parts of methyl methacrylate, 29 parts of butyl acrylate, 20 parts of styrene, and 1 part of methacrylic acid as polymerizable monomers, 1.8 parts of AQUALON KH-10 as a surfactant, and 51.2 parts of water were added in a separate mixing container and mixed thoroughly to produce an emulsion precursor.

[0247] An amount of 1.5 parts of the produced emulsion precursor was added to a reaction container containing the surfactant aqueous solution and mixed thoroughly. Next, the temperature inside the reaction container was raised to 60° C., the reaction container was flushed with nitrogen gas, and thereafter 1 part of a potassium persulfate 5% aqueous solution and 0.2 parts of an anhydrous sodium bisulphite 1% aqueous solution were added, and a polymerization reaction was started while the temperature inside the reaction container was maintained at 60° C. After performing the reaction for 5 minutes at 60° C., the remainder of the emulsion precursor (151.5 parts), 9 parts of a potassium persulfate 5% aqueous solution, and 1.8 parts of an anhydrous sodium bisulphite 1% aqueous solution were added dropwise over 1.5 hours, and thereafter the reaction continued for a further 2 hours. The reaction system was then cooled to 30° C., and diethylaminoethanol was added to bring the pH of the mixed solution to 8.5, water was additionally used to adjust the solid fraction to 30%, thereby obtaining an aqueous dispersion of binder resin 9 (30% solid content), constituted by styrene methacrylic resin microparticles.

[0248] Furthermore, with the exception of altering the polymerizable monomers as shown in Table 4, aqueous dispersions of binder resins 10 and 11 (solid fraction: 30%), constituted by styrene-(meth)acrylic resin microparticles, were obtained using the same operations as those described for the binder resin 9.

TABLE-US-00004 TABLE 4 Parameter of binder resin Polymerizable monomer Glass transition amount added (parts) Acid value temperature St MAA MMA BA PME-400 (mgKOH/g) (° C.) Binder resin 9 20 1 50 29 6 36 Binder resin 10 25 1 15 59 6 −10 Binder resin 11 15 20 55 10 0 −17

[0249] Note that the acid values and glass transition temperatures of binder resins 9 to 11 are also given in Table 4. Furthermore, from among the abbreviations for polymerizable monomers shown in Table 4, the abbreviations for materials not shown in Table 3 are as follows. [0250] PME-400: methoxy polyethylene glycol methacrylate (BLEMMER PME-400 manufactured by NOF Corporation)

Production Examples for Binder Resins 12 to 13 ((Meth)Acrylic Resin Microparticles, Styrene-(Meth)Acrylic Resin Microparticles)

[0251] A reaction container fitted with a gas inlet, a thermometer, a condenser, and a stirrer was charged with 20 parts of toluene, 7.5 parts of methacrylic acid and 7.5 parts of methyl methacrylate as polymerizable monomers, 0.9 parts of 2,2′-azobisisobutyronitrile as a polymerization initiator, and 3.6 parts of 2-(dodecylthiocarbonothioylthio)-isobutyric acid, and the reaction container was flushed with nitrogen gas. The inside of the reaction container was heated to 75° C. and a polymerization reaction was conducted for 3 hours, thereby obtaining a copolymer (A block) composed of methacrylic acid and methyl methacrylate.

[0252] Following completion of the above polymerization reaction, the reaction system was cooled to room temperature, and 60 parts of toluene, and 15 parts of methyl methacrylate, 10 parts of styrene, 45 parts of butyl acrylate, and 15 parts of lauryl methacrylate as polymerizable monomers were introduced to the reaction container, and the reaction container was flushed with nitrogen gas. The inside of the reaction container was then heated to 75° C. and a polymerization reaction was conducted for 3 hours, thereby obtaining an A-B block polymer (binder resin 12) in which a copolymer (B block) composed of methyl methacrylate, styrene, butyl acrylate, and lauryl methacrylate was added to the A block.

[0253] Thereafter, the reaction system was cooled to normal temperature, 9.3 parts of dimethylaminoethanol was then added to the reaction container to perform neutralization, and then 200 parts of water was added. Next, the mixed solution was heated and toluene was distilled, after which water was used to adjust the solid fraction to 30%, thereby obtaining an aqueous dispersion of binder resin 12 (solid fraction: 30%), constituted by styrene-(meth)acrylic resin microparticles.

[0254] Furthermore, with the exception of altering the polymerizable monomers as shown in Table 5, an aqueous dispersion of binder resin 13 (solid fraction: 30%), constituted by (meth)acrylic resin microparticles, was obtained using the same operations as those described for the binder resin 12.

TABLE-US-00005 TABLE 5 Polymerizable monomer Parameter of binder resin amount added (parts) Gass transition Weight average A block B block Acid value temperature molecular MAA MMA St MMA BA LMA (mgKOH/g) (° C.) weight Binder resin 12 7.5 7.5 10 15 45 15 47 −11 18,000 Binder resin 13 7.5 7.5 60 25 46 42 19,500

[0255] Note that the acid values, glass transition temperatures, and weight average molecular weights of binder resins 12 and 13 are also given in Table 5. Furthermore, from among the abbreviations for polymerizable monomers shown in Table 5, the abbreviations for materials not shown in Tables 3 and 4 are as follows. [0256] LMA: lauryl methacrylate

Production Examples for Binder Resins 14 to 16 (Urethane Water-Soluble Resin)

[0257] A reaction container fitted with a gas inlet, a thermometer, a condenser, and a stirrer was charged with 43.5 parts of polypropylene glycol (molecular weight 1,000) and 44.5 parts of isophorone diisocyanate as polymerizable monomers, and 0.007 parts of dibutyltin dilaurate, and the reaction container was flushed with nitrogen gas, after which the inside of the reaction container was heated to 100° C. and a polymerization reaction was conducted for 5 hours. The reaction system was cooled to approximately 60° C., after which 150 parts of methyl ethyl ketone, 9 parts of dimethylolpropionic acid, and 3 parts of neopentyl glycol were added, the inside of the reaction container was heated to 80° C., and then a polymerization reaction was conducted. Thereafter, the reaction system was cooled to room temperature, and then 20 parts of methanol was added and the reaction was stopped. Water was then added, and a potassium hydroxide aqueous solution was additionally added while stirring to perform neutralization. The mixed solution was then heated under reduced pressure to distill methyl ethyl ketone and unreacted methanol, after which water was used to adjust the solid fraction to 10%, thereby obtaining an aqueous solution of binder resin 14 (solid fraction: 10%), constituted by a urethane water-soluble resin.

[0258] Furthermore, with the exception of altering the polymerizable monomers as shown in Table 6, aqueous dispersions of binder resins 15 and 16 (solid fraction: 10%), constituted by urethane water-soluble resin, were obtained using the same operations as those described for the binder resin 14.

TABLE-US-00006 TABLE 6 Polymerizable monomer Parameter of amount added (parts) binder resin PPG PTMG Acid value Weight average 1000 2000 IPDI DMPA NPG (mgKOH/g) molecular weight Binder resin 14 43.5 44.5 9 3 37 20,000 Binder resin 15 39.7 44.2 13.1 3 54 15,000 Binder resin 16 35.7 44.5 16.8 3 69 20,000

[0259] Note that the acid values and weight average molecular weights of binder resins 14 to 16 are also given in Table 6. Furthermore, the abbreviations for polymerizable monomers given in Table 6 are as follows. [0260] PPG 1000: polypropylene glycol (molecular weight 1,000) [0261] PTM 2000: polytetramethylene ether glycol (molecular weight 2,000) [0262] IPDI: isophorone diisocyanate [0263] DMPA: dimethylolpropionic acid [0264] NPG: neopentyl glycol

Production Examples for Binder Resins 17 to 18 (Urethane Resin Microparticles)

[0265] A reaction container fitted with a gas inlet, a thermometer, a condenser and a stirrer was charged with 150 parts of methyl ethyl ketone, and 34.3 parts of polypropylene glycol (molecular weight 2,000), 22.7 parts of isophorone diisocyanate, 17.2 parts of hexamethylene diisocyanate, and 23.9 parts of dimethylolpropionic acid as polymerizable monomers, and the reaction container was flushed with nitrogen gas, after which the inside of the reaction container was heated to 80° C. and a polymerization reaction was conducted for 6 hours. Next, 1.9 parts of trimethylolpropane was additionally added and the reaction was continued at 80° C. Thereafter, the reaction system was cooled to room temperature, after which water was added and a potassium hydroxide aqueous solution was additionally added while stirring to perform neutralization. The mixed solution was then heated under reduced pressure and methyl ethyl ketone was distilled, after which water was used to adjust the solid fraction to 20%, thereby obtaining an aqueous dispersion of binder resin 17 (solid fraction: 20%), constituted by urethane resin microparticles.

[0266] Furthermore, with the exception of altering the polymerizable monomers as shown in Table 7, an aqueous dispersion of binder resin 18 (solid fraction: 10%), constituted by urethane resin microparticles, was obtained using the same operations as those described for the binder resin 17.

TABLE-US-00007 TABLE 7 Polymerizable monomer amount added (parts) Acid value of PPG PC(HD) binder resin 2000 2000 IPDI HDI DMPA TMP (mgKOH/g) Binder resin 17 34.3 22.7 17.2 23.9 1.9 98 Binder resin 18 69 11.8 9 8.3 1.9 34

[0267] Note that the acid values of binder resins 17 to 18 are also given in Table 7. Furthermore, from among the abbreviations for polymerizable monomers shown in Table 7, the abbreviations for materials not shown in Table 6 are as follows. [0268] PPG 2000: polypropylene glycol (molecular weight 2,000) [0269] PC (HD) 2000: polycarbonate diol having 1,6-hexanediol as the main skeleton (molecular weight 2,000) [0270] HDI: hexamethylene diisocyanate TMP: trimethylolpropane

<Binder Resin 19 (Urethane/Acrylic Composite Resin Microparticles), 20 to 21 (Olefin Resin Microparticles)>

[0271] In the ink production example described hereinafter, in addition to the binder resins 1 to 18 described above, the urethane/acrylic composite resin microparticles and the olefin resin microparticles described below, which are commercially available products, were used as binder resins 19 to 21. [0272] Binder resin 19: UREARNO W600 (urethane/acrylic composite resin microparticles manufactured by Arakawa Chemical Industries, Ltd., solid fraction: 35% (containing isopropyl alcohol 5%), acid value: 20 mgKOH/g, glass transition temperature: −55° C.) [0273] Binder resin 20: AUROREN AE-301 (manufactured by Nippon Paper Industries Co., Ltd., solid fraction: 30%, acid value: 25 mgKOH/g, melting point: 70° C.) [0274] Binder resin 21: ZE-1224 (manufactured by Seiko PMC Corporation, solid fraction: 30%, acid value: 50 mgKOH/g, melting point: 70° C.)

Production Examples for Water-Based Inkjet Inks 1 to 96

[0275] The materials described below were sequentially introduced into a mixing container while stirring with a disper mixer, and the mixture was stirred until sufficiently uniform. Thereafter, filtration was conducted through a membrane filter having a pore size of 1 μm, and a water-based inkjet ink 1 was obtained:

TABLE-US-00008 Magenta pigment dispersion 1 20 parts (pigment concentration: 20%) Aqueous solution of binder resin 1 16.7 parts (solid fraction: 30%) 1,2-propanediol 15 parts Surfynol 420 1 part Proxel GXL 0.05 parts Ion-exchanged water 47.25 parts

[0276] Furthermore, with the exception that the materials listed in Table 8 below were used, water-based inkjet inks 2 to 96 were obtained using the same method as that used for the water-based inkjet ink 1.

TABLE-US-00009 TABLE 8 Water-based inkjet ink No. 1 2 3 4 5 6 7 Pigment Magenta pigment dispersion 1 20 dispersion Magenta pigment dispersion 2 20 Magenta pigment dispersion 3 20 Magenta pigment dispersion 4 20 Magenta pigment dispersion 5 20 Magenta pigment dispersion 6 20 Magenta pigment dispersion 7 20 Magenta pigment dispersion 8 Magenta pigment dispersion 9 Magenta pigment dispersion 10 Magenta pigment dispersion 11 Magenta pigment dispersion 12 Magenta pigment dispersion 13 Magenta pigment dispersion 14 Magenta pigment dispersion 15 Magenta pigment dispersion 16 Magenta pigment dispersion 17 Magenta pigment dispersion 18 Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 16.7 16.7 16.7 16.7 16.7 16.7 16.7 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 1 1 1 1 1 1 1 S.465 HLB13.2 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 47.25 47.25 47.25 47.25 47.25 47.25 47.25 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 8 9 10 11 12 13 Pigment Magenta pigment dispersion 1 dispersion Magenta pigment dispersion 2 Magenta pigment dispersion 3 Magenta pigment dispersion 4 Magenta pigment dispersion 5 Magenta pigment dispersion 6 Magenta pigment dispersion 7 Magenta pigment dispersion 8 20 Magenta pigment dispersion 9 20 Magenta pigment dispersion 10 20 Magenta pigment dispersion 11 20 Magenta pigment dispersion 12 20 Magenta pigment dispersion 13 20 Magenta pigment dispersion 14 Magenta pigment dispersion 15 Magenta pigment dispersion 16 Magenta pigment dispersion 17 Magenta pigment dispersion 18 Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 16.7 16.7 16.7 16.7 16.7 16.7 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 1 1 1 1 1 1 S.465 HLB13.2 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 Water 47.25 47.25 47.25 47.25 47.25 47.25 Spec Amount of water-soluble organic 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 14 15 16 17 18 19 20 21 22 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 1 Acid value 16.7 solution or 12 mgKOH/g aqueous Binder resin 2 Acid value 16.7 dispersion 38 mgKOH/g of binder Binder resin 3 Acid value 16.7 resin 57 mgKOH/g Binder resin 4 Acid value 16.7 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 30 mgKOH/g Binder resin 7 Acid value 16.7 31 mgKOH/g Binder resin 8 Acid value 16.7 62 mgKOH/g Binder resin 9 Acid value 16.7 6 mgKOH/g Binder resin 10 Acid value 16.7 6 mgKOH/g Binder resin 11 Acid value 0 mgKOH/g Binder resin 12 Acid value 16.7 47 mgKOH/g Binder resin 13 Acid value 46 mgKOH/g Binder resin 14 Acid value 37 mgKOH/g Binder resin 15 Acid value 54 mgKOH/g Binder resin 16 Acid value 69 mgKOH/g Binder resin 17 Acid value 98 mgKOH/g Binder resin 18 Acid value 34 mgKOH/g Binder resin 19 Acid value 20 mgKOH/g Binder resin 20 Acid value 25 mgKOH/g Binder resin 21 Acid value 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 1 1 1 1 1 1 1 1 1 S.465 HLB13.2 TW280 HLB3.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 47.25 47.25 47.25 47.25 47.25 47.25 47.25 47.25 47.25 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 23 24 25 26 27 28 29 30 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Binder resin 9 Acid value 6 mgKOH/g Binder resin 10 Acid value 6 mgKOH/g Binder resin 11 Acid value 0 mgKOH/g Binder resin 12 Acid value 47 mgKOH/g Binder resin 13 Acid value 16.7 46 mgKOH/g Binder resin 14 Acid value 50.0 37 mgKOH/g Binder resin 15 Acid value 50.0 54 mgKOH/g Binder resin 16 Acid value 50.0 69 mgKOH/g Binder resin 17 Acid value 98 mgKOH/g Binder resin 18 Acid value 25.0 34 mgKOH/g Binder resin 19 Acid value 14.3 20 mgKOH/g Binder resin 20 Acid value 16.7 25 mgKOH/g Binder resin 21 Acid value 16.7 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 1 1 1 1 1 1 1 1 S.465 HLB13.2 TW280 HLB3.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 47.25 13.95 13.95 13.95 38.95 49.65 47.25 47.25 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 183.2 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 31 32 33 34 35 36 37 38 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 6.7 18.3 13.3 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Binder resin 9 Acid value 10.0 6 mgKOH/g Binder resin 10 Acid value 6 mgKOH/g Binder resin 11 Acid value 0 mgKOH/g Binder resin 12 Acid value 5.0 10.0 33.3 40.0 47 mgKOH/g Binder resin 13 Acid value 46 mgKOH/g Binder resin 14 Acid value 20.0 50.0 37 mgKOH/g Binder resin 15 Acid value 54 mgKOH/g Binder resin 16 Acid value 69 mgKOH/g Binder resin 20 Acid value 5.0 25 mgKOH/g Binder resin 21 Acid value 3.3 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 1 S.420 HLB4.0 1 1 1 1 1 1 1 S.465 HLB13.2 TW280 HLB3.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 S-202 HLB4.9 P-210 HLB12.9 E750 HLB15.6 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 58.95 53.95 30.65 23.95 37.25 40.65 37.35 13.95 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 39 40 41 42 43 44 45 46 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Binder resin 9 Acid value 6 mgKOH/g Binder resin 10 Acid value 6 mgKOH/g Binder resin 11 Acid value 0 mgKOH/g Binder resin 12 Acid value 47 mgKOH/g Binder resin 13 Acid value 46 mgKOH/g Binder resin 14 Acid value 50.0 50.0 50.0 50.0 50.0 50.0 50.0 50.0 37 mgKOH/g Binder resin 15 Acid value 54 mgKOH/g Binder resin 16 Acid value 69 mgKOH/g Binder resin 20 Acid value 25 mgKOH/g Binder resin 21 Acid value 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 S.465 HLB13.2 1 TW280 HLB3.5 1 TG432 HLB7.5 1 BYK347 HLB8.6 1 TG440 HLB13.5 1 S-202 HLB4.9 1 P-210 HLB12.9 1 E750 HLB15.6 1 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 13.95 13.95 13.95 13.95 13.95 13.95 13.95 13.95 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 47 48 49 50 51 52 53 54 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 13 Acid value solution or 46 mgKOH/g aqueous Binder resin 14 Acid value 50.0 50.0 50.0 50.0 50.0 50.0 50.0 50.0 dispersion 37 mgKOH/g of binder Binder resin 20 Acid value resin 25 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 0.2 0.5 2.5 4 0.5 S.420 HLB4.0 0.5 0.5 S.465 HLB13.2 0.5 TW280 HLB3.5 0.5 TG432 HLB7.5 0.5 BYK347 HLB8.6 TG440 HLB13.5 0.5 S-202 HLB4.9 P-210 HLB12.9 0.5 E750 HLB15.6 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 14.75 14.45 12.45 10.95 13.95 13.95 13.95 13.95 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 55 56 57 58 59 60 61 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 13 Acid value 20.0 20.0 20.0 20.0 20.0 20.0 solution or 46 mgKOH/g aqueous Binder resin 14 Acid value 50.0 dispersion 37 mgKOH/g of binder Binder resin 20 Acid value 3.3 3.3 3.3 3.3 3.3 3.3 resin 25 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 7 10.5 13 7 10.5 13.5 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 8 4.5 1.5 244° C. GY Boiling point 8 4.5 2 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 S.465 HLB13.2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 TW280 HLB3.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 S-202 HLB4.9 P-210 HLB12.9 E750 HLB15.6 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 13.95 40.65 40.65 40.65 40.65 40.65 40.65 Spec Amount of water-soluble organic 0 8 4.5 2 8 4.5 1.5 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 242.4 218.6 201.6 217.9 204.8 193.6 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 62 63 64 65 66 67 68 69 70 71 72 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 13 Acid value 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 solution or 46 mgKOH/g aqueous Binder resin 20 Acid value 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 dispersion 25 mgKOH/g of binder resin Water- IPA Boiling point 15 soluble 83° C. organic MFG Boiling point 15 solvent 121° C. 1,2-PD Boiling point 15 5 25 30 188° C. 1,2-BD Boiling point 15 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 S.465 HLB13.2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 TW280 HLB3.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 pH adjuster 28% NH.sub.3 DMAE CHA Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 40.65 40.65 40.65 40.65 55.65 55.65 55.65 55.65 50.65 30.65 25.65 Spec Amount of water-soluble organic 0 0 0 0 0 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 83.0 121.0 188.0 192.0 — — — — 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 73 74 75 76 77 78 79 80 Pigment Magenta pigment dispersion 6 20 20 20 20 20 20 20 20 dispersion Aqueous Binder resin 13 Acid value 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 solution or 46 mgKOH/g aqueous Binder resin 20 Acid value 3.3 3.3 3.3 3.3 3.3 3.3 .3.3 3.3 dispersion 25 mgKOH/g of binder resin Water- IPA Boiling point 5 soluble 83° C. organic MFG Boiling point 5 10 solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 10 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 S.465 HLB13.2 0.5 0.5 0.5 0.5 0.5 1 1 1 TW280 HLB3.5 0.5 0.5 0.5 0.5 0.5 1 1 1 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 pH 1 adjuster 1 28% NH.sub.3 3.9 DMAE 1.1 CHA 1.1 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 39.65 39.65 36.75 39.55 39.55 34.65 34.65 34.65 Spec Amount of water-soluble organic 1 1 0 0 0 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 184.2 184.3 161.8 171.3 156.5 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 81 82 83 84 85 86 87 88 Pigment Magenta pigment dispersion 1 dispersion Magenta pigment dispersion 2 Magenta pigment dispersion 3 Magenta pigment dispersion 4 Magenta pigment dispersion 5 Magenta pigment dispersion 6 Magenta pigment dispersion 7 Magenta pigment dispersion 8 Magenta pigment dispersion 9 Magenta pigment dispersion 10 Magenta pigment dispersion 11 Magenta pigment dispersion 12 Magenta pigment dispersion 13 Magenta pigment dispersion 14 20 30 15 15 Magenta pigment dispersion 15 20 15 Magenta pigment dispersion 16 20 15 Magenta pigment dispersion 17 20 Magenta pigment dispersion 18 20 Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 95 mgKOH/g Binder resin 6 Acid value 16.7 16.7 16.7 16.7 16.7 16.7 16.7 16.7 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Binder resin 9 Acid value 6 mgKOH/g Binder resin 10 Acid value 6 mgKOH/g Binder resin 11 Acid value 0 mgKOH/g Binder resin 12 Acid value 47 mgKOH/g Binder resin 13 Acid value 46 mgKOH/g Binder resin 14 Acid value 37 mgKOH/g Binder resin 15 Acid value 54 mgKOH/g Binder resin 16 Acid value 69 mgKOH/g Binder resin 17 Acid value 98 mgKOH/g Binder resin 18 Acid value 34 mgKOH/g Binder resin 19 Acid value 20 mgKOH/g Binder resin 20 Acid value 25 mgKOH/g Binder resin 21 Acid value 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 15 15 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 244° C. GY Boiling point 290° C. Surfactant S.104 HLB3.0 S.420 HLB4.0 1 1 1 1 1 1 1 1 S.465 HLB13.2 TW280 HLB3.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 47.25 37.25 47.25 47.25 47.25 47.25 37.25 37.25 Spec Amount of water-soluble organic 0 0 0 0 Q 0 0 0 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 188.0 188.0 of water-soluble organic solvent (° C.) Water-based inkjet ink No. 89 90 91 92 93 94 95 96 Pigment Magenta pigment dispersion 1 dispersion Magenta pigment dispersion 2 Magenta pigment dispersion 3 Magenta pigment dispersion 4 Magenta pigment dispersion 5 Magenta pigment dispersion 6 20 20 20 20 20 20 20 Magenta pigment dispersion 7 Magenta pigment dispersion 8 Magenta pigment dispersion 9 Magenta pigment dispersion 10 Magenta pigment dispersion 11 Magenta pigment dispersion 12 Magenta pigment dispersion 13 Magenta pigment dispersion 14 15 Magenta pigment dispersion 15 Magenta pigment dispersion 16 Magenta pigment dispersion 17 15 Magenta pigment dispersion 18 Aqueous Binder resin 1 Acid value solution or 12 mgKOH/g aqueous Binder resin 2 Acid value dispersion 38 mgKOH/g of binder Binder resin 3 Acid value resin 57 mgKOH/g Binder resin 4 Acid value 77 mgKOH/g Binder resin 5 Acid value 16.7 95 mgKOH/g Binder resin 6 Acid value 16.7 20.0 20.0 30 mgKOH/g Binder resin 7 Acid value 31 mgKOH/g Binder resin 8 Acid value 62 mgKOH/g Binder resin 9 Acid value 6 mgKOH/g Binder resin 10 Acid value 6 mgKOH/g Binder resin 11 Acid value 16.7 0 mgKOH/g Binder resin 12 Acid value 47 mgKOH/g Binder resin 13 Acid value 46 mgKOH/g Binder resin 14 Acid value 50.0 37 mgKOH/g Binder resin 15 Acid value 54 mgKOH/g Binder resin 16 Acid value 69 mgKOH/g Binder resin 17 Acid value 25.0 98 mgKOH/g Binder resin 18 Acid value 34 mgKOH/g Binder resin 19 Acid value 20 mgKOH/g Binder resin 20 Acid value 3.3 3.3 25 mgKOH/g Binder resin 21 Acid value 50 mgKOH/g Water- IPA Boiling point soluble 83° C. organic MFG Boiling point solvent 121° C. 1,2-PD Boiling point 15 15 15 15 15 15 5 5 188° C. 1,2-BD Boiling point 192° C. DEG Boiling point 10 244° C. GY Boiling point 10 290° C. Surfactant S.104 HLB3.0 0.5 0.5 S.420 HLB4.0 1 1 1 1 1 S.465 HLB13.2 TW280 HLB3.5 0.5 0.5 TG432 HLB7.5 BYK347 HLB8.6 TG440 HLB13.5 Others Proxel GXL 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Water 37.25 47.25 47.25 38.95 63.95 14.95 40.65 40.65 Spec Amount of water-soluble organic 0 0 0 0.05 0 0 10 10 solvents having a boiling point of 240° C. or higher Weight average boiling point 188.0 188.0 188.0 188.0 188.0 188.0 225.3 256.0 of water-soluble organic solvent (° C.)

[0277] Note that the materials shown in Table 8 are as follows.

(Water-Soluble Organic Solvents)

[0278] IPA: isopropyl alcohol (boiling point: 83° C.) [0279] MFG: propylene glycol monomethyl ether (boiling point: 120° C.) [0280] 1,2-PD: 1,2-propanediol (boiling point: 188° C.) [0281] 1,2-BD: 1,2-butanediol (boiling point: 192° C.) [0282] DEG: diethylene glycol (boiling point: 244° C.) [0283] GY: glycerol (boiling point: 290° C.)

(Surfactants)

[0284] S.104: Surfynol 104 (acetylenediol-based surfactant manufactured by Nissin Chemical Industry Co., Ltd., HLB value: 3.0) [0285] S.420: Surfynol 420 (acetylenediol-based surfactant manufactured by Nissin Chemical Industry Co., Ltd., HLB value: 4.0) [0286] S.465: Surfynol 465 (acetylenediol-based surfactant manufactured by Nissin Chemical Industry Co., Ltd., HLB value: 13.2) [0287] TW280: TEGO Wet 280 (siloxane-based surfactant manufactured by Evonik Industries AG, HLB value: 3.5) [0288] TG432: TEGO Glide 432 (siloxane-based surfactant manufactured by Evonik Industries AG, HLB value: 7.5) [0289] BYK347: BYK-347 (siloxane-based surfactant manufactured by BYK-Chemic GmbH, HLB value: 8.6) [0290] TG440: TEGO Glide 440 (siloxane-based surfactant manufactured by Evonik Industries AG, HLB value: 13.5) [0291] S-202: NONION S-202 (polyoxyalkylene-based surfactant manufactured by NOF Corporation, a compound in which R is a cetyl group, m is 10, and n is 0 in general formula (4) described above, HLB value: 4.9) [0292] P-210: NONION P-210 (polyoxyalkylene-based surfactant manufactured by NOF Corporation, a compound in which R is a stearyl group, m is 2, and n is 0 in general formula (4) described above, HLB value: 12.9) [0293] E750: EMALEX E750 (polyoxyalkylene-based surfactant manufactured by Nihon Emulsion Co., Ltd., a compound in which R is a lauryl group, m is 50, and n is 0 in general formula (4) described above, HLB value: 15.6)

(pH Adjusters)

[0294] Triethanolamine (pKa value: 7.8, boiling point: 335° C.) [0295] Diethanolamine (pKa value: 8.9, boiling point: 269° C.) [0296] 28% NH.sub.3: 28% ammonia water (ammonia pKa value: 9.3) [0297] DMAE: Dimethylaminoethanol (pKa value: 9.9, boiling point: 133° C.) [0298] CHA: Cyclohexylamine (pKa value: 10.6, boiling point: 134° C.) (Others) [0299] Proxel GXL: 1,2-benzoisothiazol-3-one solution manufactured by Arch Chemicals, Inc. (preservative)

Examples 1 to 80, Comparative Examples 1 to 16

[0300] The evaluations 1 to 7 described below were conducted for the water-based inkjet inks 1 to 96 produced as described above. The evaluation results were as shown in Table 9.

TABLE-US-00010 TABLE 9 Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Water-based inkjet ink No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Evaluation 1 Dispersion stability 3 3 3 3 2 3 3 3 3 3 3 3 2 3 Evaluation 2 Discharge stability 3 3 3 3 2 3 3 3 3 3 3 3 2 3 Evaluation 3 Drying properties 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Evaluation 4 Rub fastness 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Evaluation 5 Image quality 3 3 3 3 3 3 3 3 3 3 3 3 3 3 (coated paper) Evaluation 6 Density of 3 3 3 3 2 3 3 3 2 2 2 2 2 2 printed material (coated paper) Evaluation 7 Density of 2 2 3 3 2 2 3 3 2 2 2 2 2 2 printed material (high-quality paper) Example 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Water-based inkjet ink No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Evaluation 1 3 3 2 3 2 2 2 3 3 3 2 2 3 3 3 3 3 3 Evaluation 2 3 3 3 3 3 2 2 3 3 3 3 2 2 2 2 2 4 3 Evaluation 3 3 3 3 3 3 4 4 3 3 3 3 2 4 3 3 3 3 3 Evaluation 4 2 2 2 2 2 3 3 2 2 2 2 2 2 3 3 3 2 2 Evaluation 5 3 3 2 3 2 3 3 3 3 3 2 2 3 3 3 3 2 3 Evaluation 6 2 2 2 2 2 3 2 2 3 3 3 3 3 3 3 3 3 3 Evaluation 7 3 3 3 3 3 2 2 3 3 3 3 3 3 3 3 3 2 3 Example 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Water-based inkjet ink No. 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Evaluation 1 Dispersion stability 3 2 3 3 2 3 3 3 2 2 2 3 2 2 Evaluation 2 Discharge stability 3 2 3 3 2 3 2 3 2 2 2 3 2 2 Evaluation 3 Drying properties 3 3 3 3 4 3 3 3 3 3 3 3 3 3 Evaluation 4 Rub fastness 2 3 2 3 3 2 2 3 3 2 2 2 2 2 Evaluation 5 Image quality 3 3 3 3 3 3 3 3 3 2 2 3 2 2 (coated paper) Evaluation 6 Density of 3 3 3 3 3 3 3 3 3 3 3 3 3 3 printed material (coated paper) Evaluation 7 Density of 3 2 3 3 3 2 2 2 2 2 2 2 2 2 printed material (high-quality paper) Example 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Water-based inkjet ink No. 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Evaluation 1 3 3 3 2 3 3 3 2 3 2 3 3 3 3 3 2 2 3 Evaluation 2 2 3 3 3 3 3 4 2 4 4 4 4 4 4 4 3 3 4 Evaluation 3 2 3 3 3 3 3 3 3 3 2 2 3 2 3 3 4 4 4 Evaluation 4 2 2 2 2 2 2 3 3 3 2 2 3 2 3 3 2 3 3 Evaluation 5 2 3 3 2 3 3 3 3 3 2 3 3 3 3 3 2 3 3 Evaluation 6 3 3 3 3 3 3 3 3 3 2 2 2 2 2 2 3 3 3 Evaluation 7 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 Example 65 66 67 68 69 70 71 72 73 74 75 76 77 78 Water-based inkjet ink No. 65 66 67 68 69 70 71 72 73 74 75 76 77 78 Evaluation 1 Dispersion stability 3 3 2 2 2 3 3 3 3 3 3 2 2 3 Evaluation 2 Discharge stability 4 4 3 2 3 4 4 4 4 3 3 3 3 4 Evaluation 3 Drying properties 4 3 3 2 2 4 4 3 4 4 3 3 3 4 Evaluation 4 Rub fastness 3 2 2 2 2 3 3 3 3 3 3 3 3 3 Evaluation 5 Image quality 3 3 3 3 3 3 3 3 4 3 3 3 3 4 (coated paper) Evaluation 6 Density of 3 3 3 3 3 3 3 3 3 3 3 3 3 3 printed material (coated paper) Evaluation 7 Density of 2 2 2 2 2 3 2 2 3 2 2 2 2 3 printed material (high-quality paper) Example Comparative Example 79 80 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Water-based inkjet ink No. 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 Evaluation 1 3 3 2 2 2 2 2 2 2 2 2 1 2 1 3 3 2 2 Evaluation 2 4 4 2 1 2 2 2 1 1 1 1 3 1 2 4 1 4 4 Evaluation 3 4 4 3 3 3 3 3 3 3 3 3 2 4 3 2 2 1 1 Evaluation 4 3 3 2 2 2 2 2 2 2 2 2 2 3 2 1 2 1 1 Evaluation 5 4 4 3 3 3 3 3 3 3 3 3 2 2 2 1 2 2 2 Evaluation 6 3 3 2 2 2 2 1 2 2 2 2 2 2 2 2 2 2 2 Evaluation 7 3 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

<Evaluation 1: Evaluation of Dispersion Stability>

[0301] The average secondary particle size (D50) of pigments in the water-based inkjet inks 1 to 96 produced as described above was measured at 25° C. using a Nanotrac UPA EX-150 manufactured by MicrotracBEL Corporation. The ink was stored in a thermostatic chamber at 70° C. and subjected to accelerated aging for a predetermined period, after which the D50 was once again measured at 25° C. and the change over the storage period was confirmed, thereby evaluating the dispersion stability. The evaluation criteria were as follows, with evaluations of 2 and 3 being deemed practically usable levels.

[0302] 3: the change in D50 after storage for 2 weeks was less than ±5%

[0303] 2: the change in D50 after storage for 1 week was less than ±5%, but the change in viscosity after storage for 2 weeks was ±5% or more

[0304] 1: the change in D50 after storage for 1 week was ±5% or more

<Evaluation 2: Evaluation of Discharge Stability>

[0305] An inkjet head KJ4B-QA (manufactured by Kyocera Corporation, design resolution: 600 dpi) was installed above a conveyor capable of conveying a recording medium, and filled with the water-based inkjet inks 1 to 96 produced as described above. After printing a nozzle check pattern and confirming that there were no nozzle misfires, the inkjet head was left on standby for a predetermined time in a 25° C. environment. Thereafter, the nozzle check pattern was printed once again and the number of nozzle misfires was counted, thereby evaluating the discharge stability. The evaluation criteria were as follows, with evaluations of 2 to 4 being deemed practically usable levels.

[0306] 4: even after standby for 3 hours, absolutely no nozzle misfires occurred

[0307] 3: absolutely no nozzle misfires occurred even after standby for 2 hours, but one or more nozzle misfires occurred after standby for 3 hours

[0308] 2: absolutely no nozzle misfires occurred even after standby for 1 hour, but one or more nozzle misfires occurred after standby for 2 hours

[0309] 1: one or more nozzle misfires occurred after standby for 1 hour

<Evaluation 3: Evaluation of Drying Properties>

[0310] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 96 produced as described above, and then a solid image (print ratio: 100%) was printed on OPU-1 (biaxially stretched polypropylene film, thickness: 20 μm) manufactured by Mitsui Chemicals Tohcello, Inc., at a drop volume of 12 pL, and the printed material was placed in a 50° C. air oven within 10 seconds. Then, the printed material was taken out after each predetermined period of time, and whether or not ink could be removed by rubbing the surface with a finger was visually observed to thereby evaluate the drying properties. The evaluation criteria were as follows, with evaluations of 2 to 4 being deemed practically usable levels.

[0311] 4: no ink was removed from the printed surface even when the printed material was rubbed with a finger after a drying time of 30 seconds

[0312] 3: ink was removed from the printed surface when the printed material was rubbed with a finger after a drying time of 30 seconds, but no ink was removed from the printed surface when rubbed after 45 seconds

[0313] 2: ink was removed from the printed surface when the printed material was rubbed with a finger after a drying time of 45 seconds, but no ink was removed from the printed surface when rubbed after 1 minute

[0314] 1: ink did not dry even after a drying time of 1 minute, and ink was removed from the printed surface when the printed material was rubbed with a finger

<Evaluation 4: Evaluation of Rub Fastness>

[0315] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 96 produced as described above, and then a solid image (print ratio: 100%) was printed on OK Topcoat+ (coated paper, basis weight: 104.7 g/m.sup.2) manufactured by Oji Paper Co., Ltd., at a drop volume of 12 pL, and the printed material was placed in a 70° C. air oven within 10 seconds. The printed material was taken out of the oven after drying for 1 minute, and whether or not ink could be removed by rubbing the printed material a predetermined number of times with a white cotton fabric for testing (unbleached muslin No. 3) while applying a load of 200 g was visually observed to thereby evaluate the rub fastness. The evaluation criteria were as follows, with evaluations of 2 and 3 being deemed practically usable levels.

[0316] 3: no damage to the printed surface or peeling of ink was observed even after rubbing 20 times

[0317] 2: no damage to the printed surface or peeling of ink was observed even after rubbing 10 times, but damage to the printed surface or peeling of ink was observed when rubbing was performed 20 times

[0318] 1: damage to the printed surface or peeling of ink was observed when rubbing was performed 10 times

<Evaluation 5: Evaluation of Image Quality (Coated Paper)>

[0319] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 96 produced as described above, and then a gradation patch image in which the print ratio was altered in 10% increments between print ratios of 10 to 80% was printed on OK Topcoat+(coated paper, basis weight 104.7 g/m.sup.2) manufactured by Oji Paper Co., Ltd., at a drop volume of 12 pL, and the printed material was placed in a 70° C. air oven within 10 seconds. The printed material was taken out of the oven after drying for 1 minute, and whether or not there were density irregularities was visually observed to thereby evaluate the image quality with respect to coated paper. The evaluation criteria were as follows, with evaluations of 2 to 4 being deemed practically usable levels.

[0320] 4: no density irregularities were observed at any of the print ratios

[0321] 3: no density irregularities were observed at a print ratio of 70% or less

[0322] 2: no density irregularities were observed at a print ratio of 60% or less

[0323] 1: density irregularities were clearly observed at a print ratio of 60%

<Evaluation 6: Evaluation of Density of Printed Material (Coated Paper)>

[0324] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 96 produced as described above, and then a solid image (print ratio: 100%) was printed on OK Topcoat+(coated paper, basis weight: 104.7 g/m.sup.2) manufactured by Oji Paper Co., Ltd., at a drop volume of 12 pL, and the printed material was placed in a 70° C. air oven within 10 seconds. The printed material was taken out of the oven after drying for 1 minute, and the optical density (OD value) was measured using a spectral densitometer (eXact manufactured by X-Rite Inc.). Note that the light source was D50, the viewing angle was 2°, the density status was ISO Status T, and the density white reference was an absolute value. The evaluation criteria were as follows, with evaluations of 2 and 3 being deemed practically usable levels.

[0325] 3: OD value of 0.95 or more

[0326] 2: OD value of 0.90 or more

[0327] 1: OD value of less than 0.90

<Evaluation 7: Evaluation of Density of Printed Material (High-Quality Paper)>

[0328] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 96 produced as described above, and then a solid image (print ratio: 100%) was printed on OK Prince (high-quality paper) manufactured by Oji Paper Co., Ltd., at a drop volume of 12 pL, and the printed material was placed in a 70° C. air oven within 10 seconds. The printed material was taken out of the oven after drying for 1 minute, and the optical density (OD value) was measured using a spectral densitometer (eXact manufactured by X-Rite Inc.). The evaluation criteria were as follows, with evaluations of 2 and 3 being deemed practically usable levels.

[0329] 3: OD value of 0.95 or more

[0330] 2: OD value of 0.90 or more

[0331] 1: OD value of less than 0.90

[0332] As a result of the evaluation, it was confirmed that the water-based inkjet inks 1 to 80, which contain a binder resin having an acid value of 1 to 80 mgKOH/g, a surfactant, and a water-soluble organic solvent, and additionally contain 8% by mass or less of a water-soluble organic solvent having a boiling point of 240° C. or more, have practically usable quality in terms of all of dispersion stability, discharge stability, drying properties, printed material rub fastness, image quality, and printed material density.

[0333] The water-based inkjet inks 1 to 13 and 81 to 89 are systems in which the type of colorant used is altered. In the water-based inkjet inks 1 to 13, which contain a mixed crystal pigment composed of two or more naphthol-based pigments as the aforementioned colorant, all items evaluated were of a practically usable level. In particular, for the water-based inkjet inks 2 to 4, 7, and 8, dispersion stability, discharge stability, drying properties, image quality, and printed material density were all evaluated as 3 points, confirming that they have particularly excellent quality. Meanwhile, the water-based inkjet inks 81 to 89, which do not contain a mixed crystal pigment composed of two or more naphthol-based pigments, were not of a practically usable level regarding printed material density on high-quality paper, and depending on the pigment used, also had poor results for dispersion stability and/or discharge stability.

[0334] Furthermore, from among the water-based inkjet inks 24, 38 to 46, and 51 to 55 that were evaluated by altering the type of surfactant used, the water-based inkjet inks 53 and 55, in which two or more surfactants were used in combination including a siloxane-based surfactant, with the HLB value of one of the two or more surfactants being 0 to 5 and the HLB value of another one surfactant being 6 to 18, had a discharge stability of level 4 and an image quality and density on coated paper each of level 3, and were confirmed as being particularly excellent compared to when the surfactants were used alone.

Examples 81 to 156

[0335] As mentioned above, when used with respect to non-permeable substrates typified by plastic substrates, it is preferable to include a binder resin (a-1) that has a glass transition temperature of 45° C. or less, and/or is selected from the group consisting of urethane resins, urethane/acrylic composite resins, and polyolefin resins. Therefore, from among the water-based inks containing a binder resin meeting the aforementioned conditions, the water-based inkjet inks 1 to 13 and 18 to 80 were also subjected to evaluations 8 and 9 described below to be evaluated for image quality and adhesion with respect to non-permeable substrates. Note that the results were as shown in Table 10.

TABLE-US-00011 TABLE 10 Example 81 82 83 84 85 86 87 88 89 90 91 92 93 Water-based inkjet ink No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Evaluation 8 Image quality (film) 2 2 2 2 2 2 2 2 2 2 2 2 2 Evaluation 9 Adhesion to film 2 2 2 2 2 2 2 2 2 2 2 2 2 Example 94 95 96 97 98 99 100 101 102 103 104 105 106 Water-based inkjet ink No. 18 19 20 21 22 23 24 25 26 27 28 29 30 Evaluation 8 3 2 2 3 3 2 3 3 3 3 3 3 3 Evaluation 9 4 3 2 4 4 2 4 4 4 2 4 4 4 Example 107 108 109 110 111 112 113 114 115 116 117 Water-based inkjet ink No. 31 32 33 34 35 36 37 38 39 40 41 Evaluation 8 Image quality (film) 2 3 3 3 3 2 2 3 2 3 3 Evaluation 9 Adhesion to film 7 3 4 4 3 4 3 4 4 4 4 Example 118 119 120 121 122 123 124 125 126 127 128 129 130 131 Water-based inkjet ink No. 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Evaluation 8 2 2 3 2 2 2 3 3 2 3 3 3 3 3 Evaluation 9 4 4 4 4 4 4 4 4 3 4 4 4 4 4 Example 132 133 134 135 136 137 138 139 140 141 142 Water-based inkjet ink No. 56 57 58 59 60 61 62 63 64 65 66 Evaluation 8 Image quality (film) 2 2 3 2 3 3 3 3 3 3 3 Evaluation 9 Adhesion to film 3 4 4 4 4 4 3 4 4 4 4 Example 143 144 145 146 147 148 149 150 151 152 153 154 155 156 Water-based inkjet ink No. 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Evaluation 8 3 2 2 3 3 2 3 2 2 2 2 4 4 4 Evaluation 9 4 4 4 4 4 3 4 4 4 4 4 4 4 4

<Evaluation 8: Evaluation of Image Quality (Film)>

[0336] The image quality with respect to film was evaluated using the same method and evaluation criteria as in Evaluation 5 described above, with the exception that OPU-1 (biaxially stretched polypropylene film, thickness: 20 μm) manufactured by Mitsui Chemicals Tohcello, Inc. was used as a recording medium.

<Evaluation 9: Evaluation of Adhesion>

[0337] The inkjet printing device used in Evaluation 2 was filled with the water-based inkjet inks 1 to 13 and 18 to 80 produced as described above, and then a solid image (print ratio: 100%) was printed on OPU-1 (biaxially stretched polypropylene film, thickness: 20 μm) manufactured by Mitsui Chemicals Tohcello, Inc., at a drop volume of 12 pL, and the printed material was placed in a 70° C. air oven within 10 seconds. After drying for one minute, the printed material was removed from the oven, and cellophane tape (width: 18 mm) manufactured by Nichiban Co., Ltd. was firmly affixed to the surface of the printed material with the pad of a finger. Then, holding the tip end of the cellophane tape, the tape was instantaneously peeled off while maintaining a 45-degree angle, after which the surface of the printed material was visually observed to thereby evaluate adhesion. The evaluation criteria were as follows, with evaluations of 2 to 4 being deemed practically usable levels.

[0338] 4: the ratio of the peeled area with respect to the area where the cellophane tape was affixed was less than 10%

[0339] 3: the ratio of the peeled area with respect to the area where the cellophane tape was affixed was 10% or more and less than 20%

[0340] 2: the ratio of the peeled area with respect to the area where the cellophane tape was affixed was 20% or more and less than 30%

[0341] 1: the peeled area with respect to the cellophane tape adhesion surface was 30% or more

[0342] As a result of the evaluation, it was confirmed that water-based inkjet inks 1 to 13 and 18 to 80 all have excellent image quality and adhesion with respect to polypropylene film.

[0343] The disclosure of the present application is related to the subject matter described in Japanese Patent Application No. 2020-091677 filed on May 26, 2020, the entire disclosed content of which is incorporated herein by reference.