JP2019143067A - Pigment dispersion liquid and gloss control method - Google Patents

Abstract

To provide a pigment dispersion liquid for gloss control that can be used commonly for various types of solvent coating materials.SOLUTION: A pigment dispersion liquid contains a solvent (A) and a pigment (B), having a light transmittance of 10% or more.SELECTED DRAWING: None

Description

  The present invention relates to a novel pigment dispersion. The pigment dispersion of the present invention can be used in common for various types of solvent-type coating materials as a pigment dispersion for gloss adjustment.

  Conventionally, paint finishes have been applied to protect building bodies, civil engineering structures, etc., to give design, and to improve aesthetics, and various solvent-type coating materials have excellent coating properties. Many are used.

  In such a coating material, it is necessary to provide a coating material according to a wide variety of conditions. For example, even with the same type of coating material, it is necessary to prepare and cope with gloss, such as gloss, 7-minute gloss, 5-minute gloss, 3-minute gloss, and matte.

For example, Patent Document 1 describes a coating material containing a matting agent.
However, in Patent Document 1, it is necessary to prepare a coating material in which a gloss is adjusted by blending a predetermined amount of a matting agent in accordance with a desired matting degree.
Therefore, as the types of coating materials increase, the total number of coating materials including gloss adjustment products will increase synergistically, making storage and inventory management complicated at coating material manufacturing factories and retail stores. Problems may arise.

JP 2017-119730 A

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pigment dispersion that can be used in common in gloss adjustment for various types of solvent-type coating materials. .

  As a result of intensive studies, the present inventors have made it possible to adjust the gloss of a pigment dispersion liquid containing 10% or more of a solvent and a pigment as essential components without adversely affecting the color of various types of solvent-type coating materials. It has been found that it is effective, and the present invention has been completed.

That is, the present invention has the following characteristics.

1. A pigment dispersion containing a solvent (A) and a pigment (B),
A pigment dispersion characterized by having a light transmittance of 10% or more.
2. The pigment (B) is contained in an amount of 1 to 40 parts by weight with respect to 100 parts by weight of the solvent (A). A pigment dispersion described in 1.
3. 1. The ratio of aliphatic hydrocarbons in the solvent (A) is 30% by weight or more. Or 2. A pigment dispersion described in 1.
4). The pigment (B) contains a pigment having an oil absorption of 50 ml / 100 g or more. To 3. A pigment dispersion according to any one of the above.
5. And further includes a dispersant,
The dispersant is a dispersant containing an alkylene oxide in the molecule. To 4. A pigment dispersion according to any one of the above.
6). The dispersant is contained in an amount of 0.1 to 20 parts by weight with respect to 100 parts by weight of the solvent (A). To 5. A pigment dispersion according to any one of the above.
7). For coating materials containing solvent: To 6. A method for adjusting the gloss of a coating material, comprising mixing the pigment dispersion according to any one of the above.
8). For 100 parts by weight of the coating material containing a solvent: To 6. A method for adjusting the gloss of a coating material, comprising mixing 1 part by weight or more and 50 parts by weight or less of the pigment dispersion according to any of the above.
9. 6. The coating material contains a solvent having an aliphatic hydrocarbon ratio of 30% by weight or more. Or 8. The gloss adjustment method of the coating material as described in 2.

  The pigment dispersion of the present invention is effective for gloss adjustment without adversely affecting the color and physical properties of various types of solvent-type coating materials, and can be used in common with various types of solvent-type coating materials. is there. By using the pigment dispersion of the present invention, it is possible to reduce the problem of storage space and inventory management in factories, dealers, etc.

  Hereinafter, modes for carrying out the present invention will be described.

The pigment dispersion of the present invention contains a solvent (A) and a pigment (B), and the light transmittance of the pigment dispersion is 10% or more (preferably 20% or more, more preferably 30% or more). It is characterized by that.
A pigment dispersion having a light transmittance of 10% or more has good compatibility between the solvent (A) and the pigment (B), and is excellent in dispersion stability. Such pigment dispersions are highly suitable for various types of solvent-type coating materials, have excellent storage stability in coating materials, and have an excellent gloss adjustment function without adversely affecting the color of the coating film. Yes.
When the light transmittance of the pigment dispersion is less than 10%, the dispersion stability and the storage stability are insufficient, and it is difficult to use with various types of solvent-type coating materials. In addition, the color of the coating film may be adversely affected.

The light transmittance is measured with a spectrophotometer (“UV-3100” manufactured by Shimadzu Corporation), and the intensity (incident light intensity) before passing through the cell with respect to light having a wavelength of 660 nm passing through a 5 mm thick cell containing the sample. It is represented by the ratio of the intensity after passing through the cell (transmitted light intensity).
In the present invention, the solvent (A) alone is used as a blank sample, and the pigment dispersion sample containing the solvent (A) and the pigment (B) is used, which is represented by the following formula (1).
Formula (1)
Light transmittance (%) = (transmitted light intensity of pigment dispersion sample / incident light intensity of pigment dispersion sample) / (transmitted light intensity of blank sample / incident light intensity of blank sample) × 100

The mixing ratio of the solvent (A) and the pigment (B) is not particularly limited, but is 0.5 to 50 parts by weight (more preferably 1 part by weight) of the pigment (B) with respect to 100 parts by weight of the solvent (A). 40 parts by weight or less, more preferably 5 parts by weight or more and 35 parts by weight or less.
With such a mixing ratio, the pigment dispersion is excellent in transparency, exhibits high light transmittance, can be applied to various types of solvent-type coating materials, and exhibits an excellent gloss adjusting function. In addition, when adjusting to glossiness for 7 minutes, glossiness for 5 minutes, etc., the mixing ratio of a pigment (B) may be smaller.

Although a solvent (A) is not specifically limited, An aromatic hydrocarbon solvent, an aliphatic hydrocarbon solvent, etc. can be used.
As an aromatic hydrocarbon solvent, toluene, xylene, ethylbenzene etc. can be used 1 type, or 2 or more types, for example.
Examples of the aliphatic hydrocarbon solvent include n-butane, n-hexane, n-pentane, n-octane, isooctane, n-nonane, isononane, n-decane, isodecane, n-undecane, n-dodecane, and cyclopentane. , Cyclohexane, cyclobutane and the like can be used alone or in combination.
Examples of the main component of the aliphatic hydrocarbon solvent include terpin oil, mineral spirit, white spirit, mineral turpentine, isoparaffin, petroleum ether, solvent naphtha, and petroleum naphtha. Two or more types can be used.

In the present invention, a solvent in which 30% by weight or more (preferably 40% by weight or more, more preferably 50% by weight or more) of the total solvent is an aliphatic hydrocarbon solvent is particularly preferable.
Furthermore, what mixed the aliphatic hydrocarbon solvent and the aromatic hydrocarbon solvent is preferable, and the mixing ratio (weight ratio) is 90:10 to 30:70 for the aliphatic hydrocarbon solvent: aromatic hydrocarbon solvent, More preferably 85: 15-40: 60, more preferably 80: 20-50: 50 can be used. A solvent having such a mixing ratio can obtain a pigment dispersion excellent in transparency, dispersion stability, and storage stability, has no adverse effect on the color and physical properties of the coating film, and has an excellent gloss adjustment function. Demonstrate the effect.
Furthermore, what does not contain toluene and xylene and corresponds to the second petroleum having a flash point of 21 ° C. or higher is preferable in terms of safety and health.
In the present invention, “ab” is synonymous with “a to b”.

  As the solvent (A), alicyclic hydrocarbon solvents such as cyclohexane, cyclohexene, methylcyclohexane and ethylcyclohexane, ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl are used so as not to impair the effects of the present invention. Ester solvents such as ether acetate, propylene glycol monoethyl ether acetate, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, alcohol solvents such as butanol, isopropyl alcohol, cyclohexanol, ethylene glycol monobutyl ether, propylene glycol monomethyl ether A glycol-based solvent such as

The pigment (B) is not particularly limited as long as it has a gloss adjusting effect. For example, zeolite, sodium sulfate, alumina, allophane, white carbon, diatomaceous earth, wollastonite, siliceous shale, vermiculite, perlite, Otani stone powder, Activated clay, charcoal, activated carbon, wood powder, shirasu balloon, calcium carbonate, kaolin, clay, porcelain clay, china clay, talc, barite powder, barium sulfate, barium carbonate, magnesium carbonate, silica powder, aluminum hydroxide, etc. Of these, one or more can be used.
In the present invention, a pigment having an oil absorption of 50 ml / 100 g or more (more preferably 100 ml / 100 g or more, more preferably 150 ml / 100 g or more) is preferably included. As a pigment having an oil absorption of 50 ml / 100 g or more, for example, zeolite Sodium sulfate, alumina, allophane, white carbon, diatomaceous earth, wollastonite, siliceous shale, vermiculite, perlite, Otani stone powder, activated clay, charcoal, activated carbon, wood powder, shirasu balloon and the like. In the present invention, it is particularly preferable to use diatomaceous earth, white carbon or the like.
The oil absorption is a value measured according to JIS K 5101-13-1 (refined octopus oil method).
Such a pigment (B) has good compatibility (compatibility) with a solvent and a high gloss adjusting effect, so that it has excellent dispersion stability and can be adjusted in a small amount.

  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, and further preferably 2 μm or more and 15 μm or less). In the present invention, a pigment dispersion having excellent dispersion stability can be obtained even when the average particle size of the pigment (B) is large.

  In addition to the components described above, various additives may be added to the pigment dispersion of the present invention within a range that does not impair the effects of the present invention. Examples of such additives include synthetic resins, dispersants, preservatives, antifungal agents, antialgae agents, antifoaming agents, leveling agents, antisettling agents, antisagging agents, catalysts, curing accelerators, and dehydrating agents. , Ultraviolet absorbers, light stabilizers and the like.

The synthetic resin acts as a binder for the coating material, and such a synthetic resin can be added to the pigment dispersion.
The synthetic resin is not particularly limited, and examples thereof include acrylic resins, alkyd resins, urethane resins, epoxy resins, acrylic silicon resins, silicon resins, fluororesins, and the like, and one or more of these are used. Can do.
The mixing ratio of the solvent (A) and the synthetic resin is not particularly limited, but the synthetic resin (solid content) is 0.1 parts by weight or more and 10 parts by weight or less (more preferably 0.5% by weight) with respect to 100 parts by weight of the solvent (A). Part to 8 parts by weight). In the present invention, an embodiment not containing a synthetic resin is also suitable.

The dispersant is a component that contributes to the dispersion stability of the pigment dispersion and contributes to the storage stability in the coating material. Although it does not specifically limit as a dispersing agent, In this invention, the compound which contains an alkylene oxide in a molecule | numerator is preferable.
Examples of the dispersant include one or more selected from polyethylene glycol, polypropylene glycol, polybutylene glycol, and polypentene glycol, or ethylene oxide, propylene oxide, butylene oxide, pentene oxide, ethylene glycol, diethylene glycol, and propylene glycol. , Polyalkylene glycols such as reaction products obtained by reacting one or more selected from dipropylene glycol, butylene glycol, dibutylene glycol, pentene glycol,
Alternatively, a polyalkylene glycol adduct obtained by adding one or more selected from a hydroxyl group-containing compound, an isocyanate-containing compound, a carboxyl group-containing compound, a phosphoric acid group-containing compound, and a sulfonic acid group-containing compound to the polyalkylene glycol is used. Can do.

  Examples of the hydroxyl group-containing compound include hydroxyl group-containing compounds other than polyalkylene glycols such as 1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,2- Hexanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, glycerin, polyglycerin, 1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,2,4-butanetriol, pentaerythritol, sorbitol and the like can be mentioned.

Examples of the isocyanate-containing compound include 1,3-trimethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,3-pentamethylene diisocyanate, 1,5-pentamethylene diisocyanate, 1,6-hexamethylene diisocyanate (HMDI). 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, 3-methyl-1,5-penta Methylene diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,6-diisocyanate methylcaproate, Jinji diisocyanate - DOO, dimer acid diisocyanate, aliphatic diisocyanates such as norbornene diisocyanate;
1,3-cyclopentane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanate methyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4'-methylenebis (cyclohexyl isocyanate), methyl- 2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 1,3-bis (isocyanate methyl) cyclohexane, 1,4-bis (isocyanate methyl) cyclohexane, isophorone diisocyanate (IPDI), norbornane diisocyanate, dicyclohexylmethane diisocyanate Alicyclic diisocyanates such as hydrogenated diphenylmethane diisocyanate and hydrogenated xylylene diisocyanate;
m-phenylene diisocyanate, p-phenylene diisocyanate, 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), naphthylene-1,4-diisocyanate, naphthylene- 1,5-diisocyanate, 4,4'-diphenyl diisocyanate, 4,4'-diphenylmethane diisocyanate (MDI), 2,4'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 2-nitrodiphenyl-4 , 4'-diisocyanate, 2,2'-diphenylpropane-4,4'-diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, 3,3'- Dimethoxydiphenyl Aromatic diisocyanates such as 4,4'-diisocyanate, dianisidine diisocyanate, tetramethylene xylylene diisocyanate;
1,3-xylylene diisocyanate (XDI), 1,4-xylylene diisocyanate (XDI), ω, ω′-diisocyanate-1,4-diethylbenzene, 1,3-bis (1-isocyanate-1- Araliphatic diisocyanates such as methylethyl) benzene, 1,4-bis (1-isocyanate-1-methylethyl) benzene, 1,3-bis (α, α-dimethylisocyanatomethyl) benzene;
And these isocyanate group-containing compounds derivatized by allohanation, biuretization, dimerization (uretidione), trimerization (isocyanurate), adduct formation, carbodiimide reaction, etc., and mixtures thereof, and these isocyanates Examples thereof include a copolymer of a group-containing compound and the above-described copolymerizable monomer.

  Examples of the carboxyl group-containing compound include malonic acid, maleic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, cyclobutanedicarboxylic acid, cyclopentanedicarboxylic acid, cyclohexane Dicarboxylic acid, terephthalic acid, isophthalic acid, orthophthalic acid, hexahydrophthalic acid, tetrahydrophthalic acid, fumaric acid, naphthalene dicarboxylic acid, naphthalic acid, norbornane dicarboxylic acid, biphenyl dicarboxylic acid, 1,2-bis (phenoxy) ethane-p , P′-dicarboxylic acid, p-hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid, pyromellitic acid, trimellitic acid, 12-hydroxystearic acid, dimethylolpropionic acid, dimethylolbutanoic acid, Gore acid, tartaric acid, and citric acid. Or these acid anhydrides etc. are mentioned.

  Examples of the phosphoric acid group-containing compound include phosphoric acid, pyrophosphoric acid, metaphosphoric acid, polyphosphoric acid, phosphorous acid, phosphorus oxychloride, phosphorus anhydride, diphosphorus pentoxide, and the like.

  Examples of the sulfonic acid group-containing compound include dinonylnaphthalenedisulfonic acid, methanedisulfonic acid, 1,2-ethanedisulfonic acid, 1,3-propanedisulfonic acid, 1,4-butanedisulfonic acid, benzenedisulfonic acid, and naphthalenedisulfonic acid. Acid, biphenyl disulfonic acid, etc. are mentioned.

  In the present invention, a dispersant containing an alkylene oxide having 3 to 5 carbon atoms is particularly preferable, and the pigment (B) can be efficiently dispersed in the solvent (A). Even if the solvent in the pigment dispersion is different from the solvent in the coating material, it exhibits excellent storage stability and exhibits an excellent gloss adjusting function without adversely affecting the color.

  The mixing ratio of the solvent (A) and the dispersant is not particularly limited, but is 0.1 to 20 parts by weight (more preferably 0.5 to 15 parts by weight) with respect to 100 parts by weight of the solvent (A). Part or less).

  The pigment dispersion of the present invention can be prepared by mixing the above-mentioned solvent (A) and pigment (B), and other additives as necessary, and dispersing them with a dispersing device. As the dispersing device, a known device such as an attritor, a ball mill, a sand mill, a homomixer, or a paint shaker may be used.

The viscosity of the pigment dispersion is not particularly limited, but is preferably from 0.5 Pa · s to 10 Pa · s. The viscosity is a value measured with a B-type rotational viscometer at a temperature of 23 ° C. and a relative humidity of 50% RH.
The thixotropy index (TI value) of the pigment dispersion is not particularly limited, but is preferably 3 or more and 10 or less. The TI value is a value obtained by the following formula (2) using a B-type rotational viscometer at a temperature of 23 ° C. and a relative humidity of 50% RH.
(Formula 2) TI value = η1 / η2
(However, η1: Viscosity at 2 rpm (Pa · s: guide value for the second rotation), η2: Viscosity at 20 rpm (Pa · s: Guide value for the fourth rotation))
By virtue of such viscosity, excellent pigment miscibility and storage stability can be exhibited for a wide variety of solvent-type coating materials.

  The pigment dispersion of the present invention can be used to adjust the gloss of various types of solvent-type coating materials. In particular, in the present invention, a coating material in which 30% by weight or more of the total solvent is an aliphatic hydrocarbon solvent is preferable, and either a one-component type or a two-component type may be used. Examples of the resin contained in the solvent-type coating material include acrylic resins, alkyd resins, urethane resins, epoxy resins, acrylic silicon resins, fluororesins, and composites thereof.

  The mixing ratio of the pigment dispersion may be set as appropriate according to the desired degree of gloss, but is preferably 1 part by weight or more and 50 parts by weight or less, more preferably with respect to the solvent-type coating material (total amount) to be mixed. Is mixed at 2 to 40 parts by weight.

  Examples are given below to clarify the features of the present invention. In the production of the pigment dispersion, the following components were used.

Solvent A: xylene / mineral spirit mixed solution (Ratio of aliphatic hydrocarbon: 88% by weight, aliphatic hydrocarbon solvent: aromatic hydrocarbon solvent 88:12)
Solvent B: xylene / mineral spirit mixed solution (Ratio of aliphatic hydrocarbon: 70% by weight, aliphatic hydrocarbon solvent: 70:30 aromatic hydrocarbon solvent)
Solvent C: xylene / mineral spirit mixed solution (aliphatic hydrocarbon ratio: 45% by weight, aliphatic hydrocarbon solvent: aromatic hydrocarbon solvent 45:55)
Solvent D: xylene / mineral spirit mixed solution (Ratio of aliphatic hydrocarbon: 35% by weight, aliphatic hydrocarbon solvent: 35:65 aromatic hydrocarbon solvent)
Solvent E: xylene / toluene / mineral spirit mixed solution (aliphatic hydrocarbon ratio: 20% by weight, aliphatic hydrocarbon solvent: 20:80 aromatic hydrocarbon solvent)
Pigment A: White carbon (oil absorption 210 ml / 100 g, average particle size 10 μm)
Pigment B: wollastonite (oil absorption 56 ml / 100 g, average particle diameter 5 μm)
Pigment C: calcium carbonate (oil absorption 25 ml / 100 g, average particle size 10 μm)
Synthetic resin A: acrylic resin (solid content 50 wt%, solvent: 70 wt% solvent of aliphatic hydrocarbon)
Synthetic resin B: urethane resin (solid content 50% by weight, solvent: aliphatic hydrocarbon solvent 90% by weight)
Dispersant A: (polyethylene / polypropylene) glycol Dispersant B: 1,3-xylylene diisocyanate (polyethylene / polypropylene) glycol adduct Dispersant C: Citric acid- (polyethylene / polypropylene) glycol adduct Dispersion Agent D: Citric acid- (polyethylene) glycol adduct / solvent type coating material A: 1 liquid weak solvent type acrylic resin coating material (white) (ratio of aliphatic hydrocarbon in solvent: 70% by weight)
・ Solvent type coating material B: 1 liquid weak solvent type urethane resin coating material (white) (Ratio of aliphatic hydrocarbon in solvent: 90% by weight)
・ Solvent type coating material C: 1 part NAD type urethane resin coating material (white) (Ratio of aliphatic hydrocarbon in solvent: 60% by weight)
・ Solvent type coating material D: 1 liquid weak solvent type acrylic silicon resin coating material (white) (ratio of aliphatic hydrocarbon in solvent: 40% by weight)

(Example 1)
Using the above components, mixing was performed at the blending ratio shown in Table 1, and the pigment dispersion liquid 1 was obtained by dispersing in a standard state (temperature 25 ° C., relative humidity 50%) for 1 hour. The following tests were performed on the pigment dispersion 1.

(Dispersion stability test)
The pigment dispersion 1 was placed in a 1000 ml container and sealed, and the state inside the container after being stored in a standard state for 1 day was visually confirmed. The evaluation is as follows. The results are shown in Table 2.
◎: No abnormality ○: Almost no abnormality △: Some abnormality (some precipitation)
×: Abnormal (precipitation, separation)

(Storage stability test)
As shown in Table 2, 10 parts by weight of the pigment dispersion 1 was mixed with 90 parts by weight of the solvent-type coating material A to prepare a coating material.
The coating material was put in a 1000 ml container, sealed, stored in a thermostat at 50 ° C. for 7 days, and then allowed to cool to room temperature to evaluate the state inside the container (storage stability A). The evaluation is as follows. The results are shown in Table 2.
◎: No abnormality ○: Almost no abnormality △: Some abnormality (some precipitation)
×: Abnormal (precipitation, separation)
The same applies to the solvent type coating material B (storage stability B), the solvent type coating material C (storage stability C), and the solvent type coating material D (storage stability D) instead of the solvent type coating material A. A test was conducted.

(Matte test)
As shown in Table 3, 10 parts by weight of the pigment dispersion 1 was mixed with 90 parts by weight of the solvent-type coating material A to prepare a coating material.
This coating material was spray-coated at a coating amount of 0.3 kg / m ² on a slate plate previously coated with a sealer, and then dried in a standard state for 14 days to obtain a test specimen.
In addition, only the solvent-type coating material A that does not use the pigment dispersion 1 is spray-coated at a coating amount of 0.3 kg / m ² on a slate plate that has been previously coated with a sealer, and then dried in a standard state for 14 days. This was used as a comparative specimen.
About the obtained test body and the comparative test body, 10 degree | times glossiness of 20 degree | times was measured, respectively, and the difference of the average value was compared and evaluated (matte property A). The evaluation is 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 In addition to solvent-type coating material A, solvent-type coating material B (matte property B) The same test was conducted on the solvent-type coating material C (matte C) and the solvent-type coating material D (matte D).

(Gloss unevenness test)
The surface of the test body obtained by the matte property test (matte property A) was visually observed and evaluated (gloss unevenness A). The evaluation is as follows. The results are shown in Table 2.
◎: No gloss unevenness was confirmed. ○: Almost no gloss unevenness was confirmed. △: Partial gloss unevenness was confirmed. ×: Luster unevenness was confirmed. In addition, the solvent type coating material A was replaced with a solvent type. The same test was performed on coating material B (gloss unevenness B), solvent-type coating material C (gloss unevenness C), and solvent-type coating material D (gloss unevenness D).

Claims (9)

A pigment dispersion containing a solvent (A) and a pigment (B),
A pigment dispersion characterized by having a light transmittance of 10% or more.   2. The pigment dispersion according to claim 1, wherein the pigment (B) is contained in an amount of 1 to 40 parts by weight with respect to 100 parts by weight of the solvent (A).   The pigment dispersion according to claim 1 or 2, wherein the ratio of the aliphatic hydrocarbon in the solvent (A) is 30% by weight or more.   The pigment dispersion according to any one of claims 1 to 3, wherein the pigment (B) contains a pigment having an oil absorption of 50 ml / 100 g or more. And further includes a dispersant,
The pigment dispersion according to any one of claims 1 to 4, wherein the dispersant is a dispersant containing an alkylene oxide in the molecule.   6. The pigment dispersion according to claim 1, wherein the dispersant is contained in an amount of 0.1 parts by weight or more and 20 parts by weight or less based on 100 parts by weight of the solvent (A).   A method for adjusting the gloss of a coating material, comprising mixing the pigment dispersion according to any one of claims 1 to 6 with a coating material containing a solvent.   A method for adjusting the gloss of a coating material, comprising mixing 1 part by weight or more and 50 parts by weight or less of the pigment dispersion according to any one of claims 1 to 6 with respect to 100 parts by weight of a coating material containing a solvent. The method for adjusting a gloss of a coating material according to claim 7 or 8, wherein the coating material contains a solvent having an aliphatic hydrocarbon ratio of 30% by weight or more.