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 excellent in dispersion stability and redispersibility. Background Art

[0002] Conventionally, paint finishing has been performed for protecting structures such as buildings and civil engineering structures, imparting design properties, and improving aesthetic appearance, and various solvent-based coating materials have been widely used due to their excellent coating film physical properties.

[0003] For such coating materials, it is necessary to provide coating materials corresponding to a wide variety of conditions. For example, even for coating materials of the same type, it is necessary to prepare and provide products corresponding to respective gloss levels such as full gloss, 70% gloss, 50% gloss, 30% gloss, and matte.

[0004] In such cases, a pigment dispersion for gloss adjustment may be prepared separately from the coating material, and the pigment dispersion for gloss adjustment can be mixed into the coating material for use as needed. For example, Patent Document 1 describes a method for adjusting gloss by mixing a coating material with a delustering agent. Prior Art Documents Patent Documents

[0005] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2017-119730 Summary of the Invention Problems to be Solved by the Invention

[0006] Such pigment dispersions often have problems in terms of dispersion stability and redispersibility, and in particular, improvement of dispersion stability and redispersibility is an issue for pigment dispersions for gloss adjustment. Means for Solving the Problems

[0007] As a result of diligent research, the inventors discovered that by using a solvent and a pigment as essential components, and further by using a specific dispersant in combination, a pigment dispersion liquid with excellent dispersion stability and redispersibility, and effective for gloss adjustment, can be obtained, thus completing the present invention.

[0008] In other words, the present invention has the following features. 1. A pigment dispersion containing a solvent (A), a pigment (B) with an oil absorption capacity of 50 ml / 100 g or more, and a dispersant (C), The dispersant (C) has a weight-average molecular weight 6000 to 50000 Dispersant (c-1), and dispersant with a weight-average molecular weight of less than 5000 (c-2), A pigment dispersion characterized by containing the following: 2. The pigment dispersion 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 pigment (B) per 100 parts by weight of solvent (A). 3. The pigment dispersion 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 according to any one of claims 1 to 3, characterized in that the mixing ratio (weight ratio) of the dispersant (c-1) and the dispersant (c-2) is (c-1):(c-2) is 1:9 to 9:1. 5. The pigment dispersion according to any one of claims 1 to 4, characterized in that the solvent (A) has an aliphatic hydrocarbon content of 30% by weight or more. [Effects of the Invention]

[0009] The pigment dispersion of the present invention exhibits excellent dispersion stability and redispersibility, and is effective for gloss adjustment. [Modes for carrying out the invention]

[0010] The following describes embodiments for carrying out the present invention.

[0011] The pigment dispersion of the present invention comprises a solvent (A), a pigment (B) with an oil absorption capacity of 50 ml / 100 g or more, and a dispersant (C), wherein the dispersant (C) comprises a dispersant (c-1) with a weight-average molecular weight of 5000 or more, and a dispersant (c-2) with a weight-average molecular weight of less than 5000. By using dispersants (c-1) and (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 aromatic hydrocarbon solvents, one or more of the following can be used: toluene, xylene, benzene, ethylbenzene, ethyltoluene, cumene, cymene, trimethylbenzene, naphthalene, chlorobenzene, dichlorobenzene, benzylphenyl ether, benzyl methyl ether, methylphenyl ether, ethylphenyl ether, propylphenyl ether, butylphenyl ether, 1,2-methylenedioxybenzene, 1,2-ethylenedioxybenzene, dibenzyl ether, diphenyl ether, etc. As aliphatic hydrocarbon solvents, one or more of the following can be used: n-butane, n-hexane, n-pentane, n-octane, isooctane, n-nonane, isononane, n-decane, isodecane, n-undecane, n-dodecane, cyclopentane, cyclohexane, cyclobutane, etc. Furthermore, examples of solvents primarily composed of aliphatic hydrocarbons include terpine oil, mineral spirits, white spirits, mineral turpentine, isoparaffin, petroleum ether, solvent naphtha, and petroleum naphtha, and one or more of these can be used.

[0013] In the present invention, a solvent is particularly preferred in which 30% by weight or more (preferably 40% by weight or more, and more preferably 50% by weight or more) of the total solvent is an aliphatic hydrocarbon solvent. Furthermore, a mixture of an aliphatic hydrocarbon solvent and an aromatic hydrocarbon solvent is preferred, and a suitable mixing ratio (by weight) of aliphatic hydrocarbon solvent to aromatic hydrocarbon solvent is 90:10 to 30:70, more preferably 85:15 to 40:60, and more preferably 80:20 to 50:50. Solvents with such a mixing ratio can produce a pigment dispersion with excellent dispersion stability and redispersibility, without adversely affecting the color or physical properties of the coating film, and exhibiting excellent gloss adjustment effects. Furthermore, from a safety and health perspective, it is preferable to use a product that does not contain toluene or xylene and falls under the category of Class 2 petroleum with a flash point of 21°C or higher.

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

[0015] Pigment (B) is used, which has an oil absorption capacity 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 gloss adjustment 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 with excellent dispersion stability and redispersibility, and effective for gloss adjustment can be obtained. Examples of the pigment (B) include zeolite, sodium sulfate, alumina, allophane, white carbon, diatomaceous earth, wollastonite, siliceous shale, vermiculite, perlite, Oyaishi powder, activated clay, charcoal, activated carbon, wood flour, shirasu balloons, calcium carbonate, kaolin, clay, potter's clay, china clay, talc, barite powder, barium sulfate, barium carbonate, magnesium carbonate, silica powder, and aluminum hydroxide. One or more of these can be used. The oil absorption is a value measured in accordance with JIS K 5101-13-1 (purified linseed oil method).

[0016] The average particle diameter of the pigment (B) is not particularly limited, but is preferably 1 µm or more and 30 µm or less (more preferably 1.5 µm or more and 20 µm or less, still more preferably 2 µm or more and 15 µm or less). By using such a pigment (B), the present invention can provide a pigment dispersion 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 parts by weight or more and 50 parts by weight or less of the pigment (B) relative to 100 parts by weight of the solvent (A), more preferably 1 part by weight or more and 45 parts by weight or less, still more preferably 3 parts by weight or more and 40 parts by weight or less, and most preferably 5 parts by weight or more and 35 parts by weight or less. If the ratio falls within this range, excellent storage stability, redispersibility, and gloss adjustment are obtained, which is preferable.

[0018] The dispersant (C) is characterized by comprising a dispersant (c-1) having a weight average molecular weight of 5000 or more, and a dispersant (c-2) having a weight average molecular weight of less than 5000.

[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, polycondensates of a polyvalent carboxylic acid and one or more selected from polyester polyols, polyether polyols, and acrylic polyols, or amine salts or metal salts thereof, A reaction product of an acid-containing polymer and one or more selected from polyhydric alcohols, polyester polyols, polyether polyols and acrylic polyols, or an amine salt or metal salt thereof, a polycondensate of an amine and a polyhydric alcohol, or a carboxylate, sulfonate or phosphate thereof and the like.

[0020] Examples of the polyester polyol include those obtained by reacting a polycarboxylic acid with a polyhydric alcohol, ring-opening polymers of cyclic esters (lactones), those obtained by reacting a polyhydric alcohol, a polycarboxylic acid and a cyclic ester, and adducts of an alkylene oxide to the foregoing, etc. Examples of the polycarboxylic acid 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, naphthalenetricarboxylic acid, etc., and one or more of these can 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 include chol, tributylene glycol, tetrabutylene glycol, dihexylene glycol, trihexylene glycol, tetrahexylene glycol, glycerin, trimethylolpropane, trimethylolethane, butanetriol, pentaerythritol, dipentaerythulitol, hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, bisphenol F, tetramethylbiphenol, etc., as well as ethylene oxide adducts and hydrogenated compounds thereof, and one or more of these can be used. Examples of cyclic esters in ring-opening polymers 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; polyether polyols obtained by adding alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide using the above polyhydric alcohol 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 monomers, and reaction products of carboxylic acid-containing monomers and polyalkylene glycols. Examples of monomers containing hydroxyl group monomers 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, N-hydroxyethylacrylamide, etc., and one or more of these can be used. Examples of carboxylic acid-containing monomers include (meth)acrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, etc., 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 acid-containing polymers include polymers of monomers containing carboxylic acid-containing monomers such as (meth)acrylic acid, maleic acid, fumaric acid, crotonic acid, and itaconic acid. Furthermore, polymers copolymerized with the above-mentioned hydroxyl group-containing monomers, as well as other known polymerizable monomers, can also be used as acid-containing polymers.

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

[0025] In addition to known catalysts and polymerization catalysts, the above-mentioned dispersants can also be manufactured by mixing components such as isocyanate-containing compounds, amine-containing compounds, phosphoric acid-containing compounds, and sulfonic acid-containing compounds.

[0026] The dispersant (c-1) is a dispersant having a weight-average molecular weight of 5000 or more, preferably 5000 to 50000, more preferably 6000 to 40000, and even more preferably 8000 to 30000. By using a dispersant within this range, a pigment dispersion with excellent dispersion stability, redispersibility, and especially redispersibility at low temperatures can be obtained. The weight-average molecular weight is a value obtained by measuring using gel permeation chromatography.

[0027] Furthermore, the dispersant (c-1) preferably has an acid value and a hydroxyl value, and is particularly preferably an acid value of 0.1 mg KOH / g or more and 8 mg KOH / g or less (more preferably 0.2 mg KOH / g or more and 5 mg KOH / g or less), and a hydroxyl value of 8 mg KOH / g or more and 100 mg KOH / g or less (more preferably 10 mg KOH / g or more and 50 mg KOH / g or less). Within this range, it is preferable to have excellent redispersibility and redispersibility. Furthermore, the dispersant (c-1) may have an amine value. If it has an amine value, it is preferable that the amine value is 0.05 mg KOH / g or more and 10 mg KOH / g or less (more preferably 0.1 mg KOH / g or more and 5 mg KOH / g or less). The acid value is expressed as the number of mg of potassium hydroxide equivalent to the number of acid groups contained in 1 g of solids, the hydroxyl value is expressed as the number of mg of potassium hydroxide equivalent to the number of hydroxyl groups contained in 1 g of solids, and the amine value is expressed as the number of mg of potassium hydroxide equivalent to the number of amine groups contained in 1 g of solids and the number of bases equivalent to that amount.

[0028] In the present invention, as the dispersant (c-1), one or more selected from polyester polyols, polyether polyols, and acrylic polyols, a polycondensate of a polycarboxylic acid and one or more selected from polyester polyols, polyether polyols, and acrylic polyols, and a reaction product of an acid-containing polymer and one or more selected from polyhydric alcohols, polyester polyols, polyether polyols, and acrylic polyols can be suitably used.

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

[0030] Furthermore, the dispersant (c-2) preferably has an acid value and an amine value, and is particularly preferably an acid value of 8 mg KOH / g or more and 50 mg KOH / g or less (more preferably 10 mg KOH / g or more and 40 mg KOH / g or less), and an amine value of 8 mg KOH / g or more and 50 mg KOH / g or less (more preferably 10 mg KOH / g or more and 40 mg KOH / g or less). Within this range, it is preferable to have excellent redispersibility and redispersibility. Furthermore, the dispersant (c-2) may also have a hydroxyl value. If it has a hydroxyl value, it is preferable that the hydroxyl value is 0.05 mg KOH / g or more and 10 mg KOH / g or less (more preferably 0.1 mg KOH / g or more and 5 mg KOH / g or less).

[0031] In the present invention, as the dispersant (c-2), it is preferable to use one or more amine salts 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 polyhydric alcohols, polyester polyols, polyether polyols, and acrylic polyols; and one or more polycondensates of amines and polyhydric alcohols or their carboxylate salts, sulfonates, and phosphates.

[0032] The mixing ratio (weight ratio) of solvent (A) and dispersant (C) is not particularly limited, but it is preferably 0.1 parts by weight or more and 20 parts by weight of dispersant per 100 parts by weight of solvent (A), more preferably 0.5 parts by weight or more and 18 parts by weight, even more preferably 1 part by weight or more and 16 parts by weight, and most preferably 3 parts by weight or more and 15 parts by weight. Within this range, dispersion stability and redispersibility, especially redispersibility at low temperatures, are excellent and therefore preferable. Furthermore, the mixing ratio (weight ratio) of dispersant (c-1) and dispersant (c-2) is preferably 1:9 to 9:1 (and even more preferably 2:8 to 8:2). Within this range, storage stability and redispersibility, especially at low temperatures, are excellent, making it preferable.

[0033] The pigment dispersion of the present invention can be prepared by mixing a solvent (A), a pigment (B), a dispersant (C), and other additives as needed, and dispersing them in a dispersion apparatus. As the dispersion apparatus, known apparatuses such as attritors, ball mills, sand mills, homomixers, and paint shakers may be used.

[0034] The viscosity of the pigment dispersion is not particularly limited, but is preferably between 0.5 Pa·s and 10 Pa·s. The viscosity was measured using a Type B rotational viscometer (rotation speed: 20 rpm) at a temperature of 23°C and a relative humidity of 50% RH. Furthermore, the thixotropy index (TI value) of the pigment dispersion is not particularly limited, but is preferably between 3 and 10. The TI value is determined using a B-type rotational viscometer at a temperature of 23°C and a relative humidity of 50% RH, and is calculated using the following formula. (Formula) TI value = η1 / η2 (However, 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, antialgal agents, defoaming agents, leveling agents, anti-settling agents, anti-sagging agents, catalysts, curing accelerators, dehydrating agents, UV absorbers, and light stabilizers. [Examples]

[0036] Examples are shown below to further clarify the features of the present invention. The following components were used in the production of 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 spirit mixed solution (Aliphatic hydrocarbon ratio: 70% by weight, aliphatic hydrocarbon solvent:aromatic hydrocarbon solvent ratio:70:30) Pigment A: White carbon (oil absorption capacity 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 capacity 25 ml / 100 g, average particle size 10 μm) Dispersant A: Acrylic polyol, acid value 3 mg KOH / g, hydroxyl value 35 mg KOH / g, weight-average molecular weight 11000 Dispersant B: Acrylic polyol, acid value 2 mg KOH / g, hydroxyl value 30 mg KOH / g, weight-average molecular weight 13000 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 20 mg KOH / g, amine value 25 mg KOH / g, weight-average molecular weight 2000 • Solvent-based coating material A: One-component weak solvent-based acrylic resin coating material (white) (Ratio of aliphatic hydrocarbons in the solvent: 70% by weight)

[0038] (Examples 1-12, Comparative Examples 1-3) Using the above components, a pigment dispersion was obtained by mixing them in the proportions shown in Table 1 and dissolving them in a dissolver under standard conditions (temperature 25°C, relative humidity 50%) for 1 hour. The following tests were performed 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 inside the container was then visually inspected. The evaluation is as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities present (some sediment present) ×: Abnormality detected (sediment formation, separation occurring)

[0040] (Redispersion test 1) The pigment dispersion was placed in a 1000 ml container, sealed, and stored under standard conditions for 30 days. Afterward, it was vibrated at 10 Hz for 30 seconds using a paint shaker, and the condition inside the container was visually inspected. The evaluation is as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities present (some sediment present) ×: Abnormality detected (sediment formation, separation occurring)

[0041] (Redispersion test 2) The pigment dispersion was placed in a 1000 ml container, sealed, and stored at 5°C for 30 days. Afterward, the container was vibrated at 10 Hz for 30 seconds using a paint shaker, and the internal condition was visually inspected. The evaluation is as follows. The results are shown in Table 2. ◎: No abnormalities ○: Almost no abnormalities △: Some abnormalities present (some sediment present) ×: Abnormality detected (sediment formation, separation occurring)

[0042] (Matteness Test 1) To 90 parts by weight of the solvent-based coating material A described above, 10 parts by weight of the pigment dispersion after redispersibility test 1 was mixed to prepare a coating material. The coating material was spray-applied at a rate of 0.3 kg / m2 to slate boards that had been pre-coated with a sealer, and then dried for 14 days under standard conditions to create test specimens. Furthermore, for solvent-based coating material A, which does not use a pigment dispersion, a comparative test specimen was prepared by spray-painting it onto a slate board that had been pre-coated with a sealer at a coating rate of 0.3 kg / m2, and then drying it under standard conditions for 14 days. The gloss level at 20 degrees was measured at 10 points for both the obtained test specimens and the comparison test specimens, and the difference in the average values ​​was compared and evaluated. The evaluation is as follows. The results are shown in Table 2. ◎: Difference of 10 or more ○: Difference of 5 or more but less than 10 △: Difference is 3 or more but less than 50 ×: Difference is less than 3

[0043] (Matteness Test 2) The test was conducted in the same manner as in mattification test 1, except that the pigment dispersion after redispersibility test 2 was used as the pigment dispersion. The results are shown in Table 2.

[0044] [Table 1]

Claims

1. A pigment dispersion comprising a solvent (A), a pigment (B) with an oil absorption capacity 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 characterized by containing the following:

2. The pigment dispersion according to claim 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 pigment (B) per 100 parts by weight of solvent (A).

3. The pigment dispersion liquid according to claim 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 according to any one of claims 1 to 3, characterized in that the mixing ratio (weight ratio) of the dispersant (c-1) and the dispersant (c-2) is (c-1):(c-2) is 1:9 to 9:

1.

5. The pigment dispersion according to any one of claims 1 to 4, characterized in that the solvent (A) has an aliphatic hydrocarbon content of 30% by weight or more.

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