Pigment dispersion

Abstract

To provide a pigment dispersion that is excellent in dispersion stability and re-dispersibility, and is useful for gloss control.SOLUTION: A pigment dispersion contains a solvent (A), a pigment (B) with an oil absorption of 50 ml / 100 g or more and a dispersant (C). The dispersant (C) is a combination of a dispersant (c-1) and a dispersant (c-2) each having a specific weight average molecular weight.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a pigment dispersion having excellent dispersion stability and redispersibility. [Background technology]

[0002] Paint finishes have traditionally been used to protect the framework of buildings and civil engineering structures, to add design features, and to improve their aesthetic appearance. Various solvent-based coating materials are widely used because of their excellent coating film properties.

[0003] It is necessary to provide such coating materials to meet a wide variety of requirements. For example, even for the same type of coating material, it is necessary to prepare different types according to the gloss, such as glossy, 70% gloss, 50% gloss, 30% gloss, and matte.

[0004] In such a case, a pigment dispersion for adjusting gloss may be prepared separately from the coating material, and the pigment dispersion for adjusting gloss may be mixed with the coating material as required. For example, Patent Document 1 describes a method of adjusting the gloss by mixing a coating material with a matting agent. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-119730 Summary of the Invention [Problem to be solved by the invention]

[0006] Such pigment dispersions often have problems with dispersion stability and redispersibility, and particularly, pigment dispersions for adjusting gloss have problems with improving dispersion stability and redispersibility. [Means for solving the problem]

[0007] As a result of extensive research, the present inventors have found that by using a solvent and a pigment as essential components and further using a specific dispersant in combination, a pigment dispersion liquid that is excellent in dispersion stability and re-dispersibility and is effective for adjusting gloss can be obtained, and have thus completed the present invention.

[0008] That is, the present invention has the following features. 1. A pigment dispersion comprising a solvent (A), a pigment (B) having an oil absorption of 50 ml / 100 g or more, and a dispersant (C), The dispersant (C) has a weight average molecular weight of More than 6,000 and less than 50,000 and a dispersant (c-2) having a weight average molecular weight of less than 5,000. A pigment dispersion comprising: 2. The pigment dispersion liquid according to 1., characterized in that the mixing ratio (weight ratio) of the solvent (A) and the pigment (B) is 0.5 parts by weight or more and 50 parts by weight or less of the pigment (B) per 100 parts by weight of the solvent (A). 3. The pigment dispersion liquid according to 1. or 2., characterized in that the mixing ratio (weight ratio) of the solvent (A) and the dispersant (C) is 0.1 parts by weight or more and 20 parts by weight or less of the dispersant (C) per 100 parts by weight of the solvent (A). 4. The pigment dispersion liquid according to any one of 1. to 3., wherein the mixing ratio (weight ratio) of the dispersant (c-1) to the dispersant (c-2) is (c-1):(c-2) 1:9 to 9:1. 5. The pigment dispersion liquid according to any one of 1. to 4., wherein the solvent (A) contains an aliphatic hydrocarbon in an amount of 30% by weight or more. [Effects of the Invention]

[0009] The pigment dispersion of the present invention has excellent dispersion stability and redispersibility, and is effective for adjusting gloss. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described.

[0011] The pigment dispersion of the present invention comprises a solvent (A), a pigment (B) having an oil absorption of 50 ml / 100 g or more, and a dispersant (C), wherein the dispersant (C) comprises a dispersant (c-1) having a weight-average molecular weight of 5,000 or more, and a dispersant (c-2) having a weight-average molecular weight of less than 5,000. By using such dispersant (c-1) and dispersant (c-2) in combination, a dispersant with excellent dispersion stability and redispersibility can be obtained.

[0012] The solvent (A) is not particularly limited, but aromatic hydrocarbon solvents, aliphatic hydrocarbon solvents, etc. can be used. As the aromatic hydrocarbon solvent, for example, one or more of toluene, xylene, benzene, ethylbenzene, ethyltoluene, cumene, cymene, trimethylbenzene, naphthalene, chlorobenzene, dichlorobenzene, benzyl phenyl ether, benzyl methyl ether, methyl phenyl ether, ethyl phenyl ether, propyl phenyl ether, butyl phenyl ether, 1,2-methylenedioxybenzene, 1,2-ethylenedioxybenzene, dibenzyl ether, diphenyl ether, etc. can be used. As the aliphatic hydrocarbon solvent, for example, n-butane, n-hexane, n-pentane, n-octane, isooctane, n-nonane, isononane, n-decane, isodecane, n-undecane, n-dodecane, cyclopentane, cyclohexane, cyclobutane, etc. can be used alone or in combination. Examples of solvents containing aliphatic hydrocarbon solvents as the main component include terpine oil, mineral spirits, white spirits, mineral turpene, isoparaffin, petroleum ether, solvent naphtha, and petroleum naphtha, and one or more of these can be used.

[0013] In the present invention, it is particularly preferred that the solvent contains 30% by weight or more (preferably 40% by weight or more, and more preferably 50% by weight or more) of aliphatic hydrocarbon solvents in the total solvent. Furthermore, a mixture of an aliphatic hydrocarbon solvent and an aromatic hydrocarbon solvent is preferred, with the mixing ratio (by weight) of aliphatic hydrocarbon solvent:aromatic hydrocarbon solvent being 90:10 to 30:70, more preferably 85:15 to 40:60, and even more preferably 80:20 to 50:50. Solvents with such a mixing ratio can produce a pigment dispersion with excellent dispersion stability and redispersibility, and exhibit excellent gloss adjustment effects without adversely affecting the color or physical properties of the coating film. Furthermore, from the standpoint of safety and hygiene, it is preferable to use a product that does not contain toluene or xylene and that falls under the category of second petroleum products with a flash point of 21°C or higher.

[0014] The solvent (A) may also contain, to the extent that the effects of the present invention are not impaired, alicyclic hydrocarbon solvents such as cyclohexane, cyclohexene, methylcyclohexane, and ethylcyclohexane; ester-based solvents such as ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate; ketone-based solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohol-based solvents such as butanol, isopropyl alcohol, and cyclohexanol; and glycol-based solvents such as ethylene glycol monobutyl ether and propylene glycol monomethyl ether.

[0015] The pigment (B) has an oil absorption of 50 ml / 100 g or more (more preferably 100 ml / 100 g or more, and even more preferably 150 ml / 100 g or more). By using such a pigment, a pigment dispersion effective for adjusting gloss can be obtained. In the present invention, even when such a pigment is used, by using dispersant (c-1) and dispersant (c-2) in combination, a pigment dispersion excellent in dispersion stability and redispersibility and effective for adjusting gloss can be obtained. Examples of the pigment (B) include zeolite, sodium sulfate, alumina, allophane, white carbon, diatomaceous earth, wollastonite, siliceous shale, vermiculite, perlite, Oya stone powder, activated clay, charcoal, activated carbon, wood flour, shirasu balloon, calcium carbonate, kaolin, clay, china clay, talc, barite powder, barium sulfate, barium carbonate, magnesium carbonate, silica powder, and aluminum hydroxide, and one or more of these can be used. The oil absorption is a value measured in accordance with JIS K 5101-13-1 (refined linseed oil method).

[0016] The average particle size of the pigment (B) is not particularly limited, but is preferably from 1 μm to 30 μm (more preferably from 1.5 μm to 20 μm, and even more preferably from 2 μm to 15 μm). By using such a pigment (B), the present invention can obtain a pigment dispersion that is excellent in dispersion stability, redispersibility, and gloss adjustment.

[0017] The mixing ratio (weight ratio) of the solvent (A) to the pigment (B) is preferably 0.5 to 50 parts by weight of the pigment (B) relative to 100 parts by weight of the solvent (A), more preferably 1 to 45 parts by weight, even more preferably 3 to 40 parts by weight, and most preferably 5 to 35 parts by weight. This range is preferable because it provides excellent storage stability, redispersibility, and gloss adjustment.

[0018] The dispersant (C) is characterized by containing a dispersant (c-1) having a weight-average molecular weight of 5,000 or more and a dispersant (c-2) having a weight-average molecular weight of less than 5,000.

[0019] Examples of the dispersant (C) include: one or more selected from polyester polyols, polyether polyols, and acrylic polyols, or amine salts or metal salts thereof; a polycondensation product of a polycarboxylic acid with one or more selected from polyester polyols, polyether polyols, and acrylic polyols, or an amine salt or metal salt thereof; a reaction product of an acid-containing polymer with one or more selected from polyhydric alcohols, polyester polyols, polyether polyols, and acrylic polyols, or an amine salt or metal salt thereof; Polycondensation products of amines and polyhydric alcohols, or their carboxylates, sulfonates, and phosphates etc.

[0020] Examples of polyester polyols include those obtained by reacting a polycarboxylic acid with a polyhydric alcohol, ring-opening polymerization products of cyclic esters (lactones), those obtained by reacting a polyhydric alcohol with a polycarboxylic acid and a cyclic ester, and adducts of these with alkylene oxides. Examples of polycarboxylic acids include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, phthalic acid, terephthalic acid, isophthalic acid, hexahydrophthalic acid, tetrahydrophthalic acid, itaconic acid, lactic acid, citric acid, fumaric acid, maleic acid, cinnamic acid, hexanetricarboxylic acid, trimellitic acid, octanetetracarboxylic acid, pyromellitic acid, cyclobutanedicarboxylic acid, cyclopentanedicarboxylic acid, cyclohexanetricarboxylic acid, naphthalenedicarboxylic acid, and naphthalenetricarboxylic acid. One or more of these may be used. Examples of polyhydric alcohols include ethanediol, propanediol, butanediol, pentenediol, neopentyl glycol, hexanediol, heptanediol, octanediol, decanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-butene-1,4-diol, 2-butyne-1,4-diol, diethylene glycol, triethylene glycol, tetraethylene glycol, and dibutylene glycol. Examples of suitable phenolic solvents include ethanol, tributylene glycol, tetrabutylene glycol, dihexylene glycol, trihexylene glycol, tetrahexylene glycol, glycerin, trimethylolpropane, trimethylolethane, butanetriol, pentaerythritol, dipentaerythritol, hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, bisphenol F, tetramethylbiphenol, and the like, as well as ethylene oxide adducts and hydrogenated products thereof, and one or more of these may be used. In the ring-opening polymer of a cyclic ester, examples of the cyclic ester include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone.

[0021] Examples of polyether polyols include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol monoalkyl ether, and polypropylene glycol monoalkyl ether; those obtained by adding alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide to the above polyhydric alcohols as an initiator; and copolymers of alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide.

[0022] Examples of acrylic polyols include polymers or copolymers of monomers containing hydroxyl group-containing monomers, and reaction products of carboxylic acid-containing monomers and polyalkylene glycols. Examples of monomers containing a hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-chloro 2-hydroxypropyl (meth)acrylate, 2-hydroxy-2-methylpropyl (meth)acrylate, glycerol mono(meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol (meth)acrylate, caprolactone-modified (meth)acrylic acid ester, and N-hydroxyethyl acrylamide, and one or more of these can be used. Examples of the carboxylic acid-containing monomer include (meth)acrylic acid, maleic acid, fumaric acid, crotonic acid, and itaconic acid, and one or more of these can be used. Examples of polyalkylene glycols include polyethylene glycol, polypropylene glycol, and polybutylene glycol, and one or more of these can be used.

[0023] Examples of the acid-containing polymer include polymers of monomers containing carboxylic acid-containing monomers such as (meth)acrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, etc. Furthermore, the acid-containing polymer may also be a polymer obtained by copolymerizing the above-mentioned hydroxyl group-containing monomers or other known polymerizable monomers.

[0024] Examples of amines include ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, neopentyldiamine, toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, triethanolamine, and Mannich condensation products, and one or more of these can be used.

[0025] The dispersant can be produced by mixing components such as an isocyanate-containing compound, an amine-containing compound, a phosphoric acid-containing compound, a sulfonic acid-containing compound, in addition to known catalysts and polymerization catalysts.

[0026] The dispersant (c-1) has a weight-average molecular weight of 5,000 or more, preferably 5,000 to 50,000, more preferably 6,000 to 40,000, and even more preferably 8,000 to 30,000. By using a dispersant within this range, a pigment dispersion liquid with excellent dispersion stability and redispersibility, particularly redispersibility at low temperatures, can be obtained. The weight-average molecular weight is a value obtained by measurement using gel permeation chromatography.

[0027] The dispersant (c-1) preferably has an acid value and a hydroxyl value, and more preferably has an acid value of 0.1 mgKOH / g or more and 8 mgKOH / g or less (more preferably 0.2 mgKOH / g or more and 5 mgKOH / g or less), and a hydroxyl value of 8 mgKOH / g or more and 100 mgKOH / g or less (more preferably 10 mgKOH / g or more and 50 mgKOH / g or less).If the acid value is in such a range, the dispersant is excellent in redispersibility and is preferable. The dispersant (c-1) may also have an amine value. If it has an amine value, the amine value is preferably 0.05 mgKOH / g or more and 10 mgKOH / g or less (more preferably 0.1 mgKOH / g or more and 5 mgKOH / g or less). The acid value is a value expressed in mg of potassium hydroxide equivalent to the moles of acid groups contained in 1 g of solid content, the hydroxyl value is a value expressed in mg of potassium hydroxide equivalent to the moles of hydroxyl groups contained in 1 g of solid content, and the amine value is a value expressed in mg of potassium hydroxide equivalent to the moles of base equivalent to the moles of amine groups contained in 1 g of solid content.

[0028] In the present invention, as the dispersant (c-1), one or more selected from polyester polyols, polyether polyols, and acrylic polyols, polycondensates of polycarboxylic acids and one or more selected from polyester polyols, polyether polyols, and acrylic polyols, and reaction products of acid-containing polymers and one or more selected from polyhydric alcohols, polyester polyols, polyether polyols, and acrylic polyols can be particularly suitably used.

[0029] The dispersant (c-2) is a dispersant having a weight average molecular weight of less than 5000, preferably from 500 to less than 5000, and more preferably from 600 to 4000. By using a dispersant within this range, a pigment dispersion liquid having excellent dispersion stability and redispersibility can be obtained.

[0030] The dispersant (c-2) preferably has an acid value and an amine value, and more preferably has an acid value of 8 mgKOH / g or more and 50 mgKOH / g or less (more preferably 10 mgKOH / g or more and 40 mgKOH / g or less) and an amine value of 8 mgKOH / g or more and 50 mgKOH / g or less (more preferably 10 mgKOH / g or more and 40 mgKOH / g or less).If the values ​​fall within these ranges, the redispersibility and re-dispersibility are excellent, which is preferable. The dispersant (c-2) may also have a hydroxyl value. If it has a hydroxyl value, the hydroxyl value is preferably 0.05 mgKOH / g or more and 10 mgKOH / g or less (more preferably 0.1 mgKOH / g or more and 5 mgKOH / g or less).

[0031] In the present invention, the dispersant (c-2) can be particularly preferably one or more selected from the group consisting of amine salts of one or more selected from polyester polyols, polyether polyols, and acrylic polyols; amine salts of polycondensates of polycarboxylic acids and one or more selected from polyester polyols, polyether polyols, and acrylic polyols; amine salts of reaction products of acid-containing polymers and one or more selected from polyester polyols, polyether polyols, and acrylic polyols; polycondensates of amines and polyhydric alcohols, or carboxylates, sulfonates, and phosphates thereof.

[0032] The mixing ratio (weight ratio) of the solvent (A) and the dispersant (C) is not particularly limited, but is preferably 0.1 to 20 parts by weight of the dispersant relative to 100 parts by weight of the solvent (A), more preferably 0.5 to 18 parts by weight, even more preferably 1 to 16 parts by weight, and most preferably 3 to 15 parts by weight. This range is preferred because it provides excellent dispersion stability and redispersibility, especially at low temperatures. The mixing ratio (weight ratio) of dispersant (c-1) to dispersant (c-2) is preferably 1:9 to 9:1 (more preferably 2:8 to 8:2), which is preferable because it provides excellent storage stability and redispersibility, particularly at low temperatures.

[0033] The pigment dispersion of the present invention can be prepared by mixing the solvent (A), the pigment (B), the dispersant (C), and, if necessary, other additives, and dispersing the mixture using a dispersing device, such as an attritor, a ball mill, a sand mill, a homomixer, or a paint shaker.

[0034] The viscosity of the pigment dispersion is not particularly limited, but is preferably 0.5 Pa·s or more and 10 Pa·s or less. The viscosity is measured at a temperature of 23°C and a relative humidity of 50% RH using a B-type rotational viscometer (rotation speed: 20 rpm). Furthermore, the thixotropy index (TI value) of the pigment dispersion is not particularly limited, but is preferably from 3 to 10. The TI value is determined by the following formula using a B-type rotational viscometer at a temperature of 23°C and a relative humidity of 50%RH. (Formula) TI value = η1 / η2 (η1: Viscosity at 2 rpm (Pa·s: indicator value at 2 rotations), η2: Viscosity at 20 rpm (Pa·s: indicator value at 4 rotations))

[0035] Examples of additives include synthetic resins, preservatives, antifungal agents, anti-algae agents, antifoaming agents, leveling agents, anti-settling agents, anti-sagging agents, catalysts, curing accelerators, dehydrating agents, ultraviolet absorbers, and light stabilizers. [Example]

[0036] The following examples will be given to clarify the features of the present invention. The following components were used in producing the pigment dispersion.

[0037] Solvent A: Aromatic hydrocarbon solvent / aliphatic hydrocarbon (mineral spirit) mixed solution (aliphatic hydrocarbon ratio: 88% by weight, aliphatic hydrocarbon solvent: aromatic hydrocarbon solvent ratio: 88:12) Solvent B: Aromatic hydrocarbon solvent / mineral spirits mixed solution (aliphatic hydrocarbon ratio: 70% by weight, aliphatic hydrocarbon solvent: aromatic hydrocarbon solvent ratio: 70:30) Pigment A: White carbon (oil absorption 210 ml / 100 g, average particle size 10 μm) ·Pigment B: Wollastonite (oil absorption 56ml / 100g, average particle size 5μm) Pigment C: Calcium carbonate (oil absorption 25ml / 100g, average particle size 10μm) Dispersant A: Acrylic polyol, acid value 3 mg KOH / g, hydroxyl value 35 mg KOH / g, weight average molecular weight 11,000 Dispersant B: Acrylic polyol, acid value 2 mg KOH / g, hydroxyl value 30 mg KOH / g, weight average molecular weight 13,000 Dispersant C: Polyester polyol, acid value 6 mg KOH / g, hydroxyl value 25 mg KOH / g, weight average molecular weight 7000 Dispersant D: Amine salt of acrylic polyol, acid value 20 mg KOH / g, hydroxyl value 5 mg KOH / g, amine value 30 mg KOH / g, weight average molecular weight 4500 Dispersant E: Amine salt of polyester polyol, acid value 15 mg KOH / g, amine value 20 mg KOH / g, weight average molecular weight 3000 Dispersant F: Amine salt of polyester polyol, acid value 20mgKOH / g, amine value 25mgKOH / g, weight average molecular weight 2000 Solvent-based coating material A: One-component weak solvent acrylic resin coating material (white) (ratio of aliphatic hydrocarbons in the solvent: 70% by weight)

[0038] (Examples 1 to 12, Comparative Examples 1 to 3) The above components were mixed in the blending ratios shown in Table 1 and dispersed with a dissolver for 1 hour under standard conditions (temperature 25°C, relative humidity 50%) to obtain a pigment dispersion. The following tests were carried out on the pigment dispersion.

[0039] (Dispersion stability test) The pigment dispersion was placed in a 1000 ml container, sealed, and stored under standard conditions for one day. The condition of the inside of the container was then visually inspected and evaluated as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities (some sediment) ×: Abnormal (sedimentation, separation)

[0040] (Redispersibility test 1) The pigment dispersion was placed in a 1000 ml container, sealed, and stored under standard conditions for 30 days. After that, the container was shaken at 10 Hz for 30 seconds using a paint shaker, and the condition inside the container was visually inspected. The evaluation was as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities (some sediment) ×: Abnormal (sedimentation, separation)

[0041] (Redispersibility test 2) The pigment dispersion was placed in a 1000 ml container, sealed, and stored at 5°C for 30 days. After that, the container was shaken at 10 Hz for 30 seconds using a paint shaker, and the condition inside the container was visually inspected. The evaluation was as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities (some sediment) ×: Abnormal (sedimentation, separation)

[0042] (Matte test 1) A coating material was prepared by mixing 10 parts by weight of the pigment dispersion liquid after redispersibility test 1 with 90 parts by weight of the solvent-based coating material A. This coating material was sprayed onto a slate board that had previously been coated with a sealer at a coating weight of 0.3 kg / m2, and then dried under standard conditions for 14 days to prepare the test specimen. In addition, solvent-based coating material A, which does not use pigment dispersion, was spray-painted onto a slate board that had previously been coated with a sealer at a coating amount of 0.3 kg / m2, and then dried under standard conditions for 14 days to serve as a comparison test specimen. The 20-degree gloss was measured at 10 points for each of the obtained test specimens and the comparative test specimens, and the differences in the average values ​​were compared and evaluated. The evaluation was as follows. The results are shown in Table 2. ◎: Difference is 10 or more ○: Difference is 5 or more and less than 10 △: Difference is 3 or more and less than 50 ×: Difference is less than 3

[0043] (Matte test 2) The test was carried out in the same manner as in Matte Property Test 1, except that the pigment dispersion used was the pigment dispersion after Redispersibility Test 2. The results are shown in Table 2.

[0044] [Table 1]

Claims

1. A pigment dispersion comprising a solvent (A), a pigment (B) having an oil absorption of 50 ml / 100 g or more, and a dispersant (C), The dispersant (C) is a dispersant (c-1) having a weight average molecular weight of 6,000 or more and 50,000 or less, and a dispersant (c-2) having a weight average molecular weight of less than 5,000; A pigment dispersion comprising:

2. 2. The pigment dispersion liquid according to claim 1, wherein a mixing ratio (weight ratio) of the solvent (A) and the pigment (B) is 0.5 parts by weight or more and 50 parts by weight or less of the pigment (B) per 100 parts by weight of the solvent (A).

3. 3. The pigment dispersion liquid according to claim 1, wherein a mixing ratio (weight ratio) of the solvent (A) to the dispersant (C) is 0.1 parts by weight or more and 20 parts by weight or less of the dispersant (C) relative to 100 parts by weight of the solvent (A).

4. 4. The pigment dispersion liquid according to claim 1, wherein a mixing ratio (weight ratio) of the dispersant (c-1) to the dispersant (c-2) is (c-1):(c-2) 1:9 to 9:

1.

5. 5. The pigment dispersion liquid according to claim 1, wherein the solvent (A) contains an aliphatic hydrocarbon in an amount of 30% by weight or more.

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