Pigment composition, its method of manufacture, ink, toner, paint and resin molded product

Abstract

An object of the present invention is to provide a pigment composition that can be easily sieved, from which foreign matter can be easily removed, and which can suppress an increase in the viscosity of ink when used in ink. Specifically, the present invention relates to a pigment composition containing CI Pigment Yellow 180 and a surfactant, wherein the content of the surfactant in 100% by mass of the pigment composition is 1.5 to 7.0% by mass, and to inks, toners, paints, and resin molded products using the pigment composition. Also, there is provided a method for producing a pigment composition, which includes at least a mixing step of mixing CI Pigment Yellow 180, a surfactant, and water to obtain a slurry of the pigment composition, and a heating step of heating the slurry, wherein the amount of the surfactant added per 100 parts by mass of the CI Pigment Yellow 180 is 1.5 to 7.5 parts by mass.

Description

[Technical Field]

[0001] The present invention relates to a pigment composition, a method for producing the same, and to an ink, a toner, a paint, and a resin molded product. [Background technology]

[0002] While many yellow pigments have safety concerns, CI Pigment Yellow 180 is highly safe and has strong weather resistance and other durability, making it used in many applications including inks, paints, plastics, toners, and inkjet inks. Since CI Pigment Yellow 180 is used in a variety of applications, attempts have been made to improve its physical properties (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-201379 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the physical properties of CI Pigment Yellow 180 are improved by adjusting the pH during the coupling reaction and by using a surface treatment agent, but there is still room for improvement. For example, while polyoxyalkylene alkyl ether treatment is performed to improve the pigment's wettability, the presence of polyoxyalkylene alkyl ether causes a problem of a slower sieving speed of the yellow pigment composition and a lower work efficiency in the dispersion process. Therefore, an object of the present invention is to provide a pigment composition that can be easily sieved, from which foreign matter can be easily removed, and which can suppress an increase in the viscosity of ink when used in ink. [Means for solving the problem]

[0005] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by using CI Pigment Yellow 180 and a predetermined amount of a surfactant, and have thus completed the present invention. An example of the configuration of the present invention that solves the above problem is as follows.

[0006] Item 1. A pigment composition comprising CI Pigment Yellow 180 and a surfactant, wherein the content of the surfactant in 100% by mass of the pigment composition is 1.5 to 7.0% by mass.

[0007] Item 2. The pigment composition according to Item 1, wherein the surfactant is a nonionic surfactant.

[0008] Item 3. The pigment composition according to Item 1 or 2, wherein the ratio (h1 / h2) of the absolute intensity (h1) of X-ray diffraction at a Bragg angle 2θ=17.5°±0.2° to the absolute intensity (h2) of X-ray diffraction at the same Bragg angle 2θ=18.2°±0.2° in a powder X-ray diffraction pattern using CuKα characteristic X-rays of the pigment composition is 2.00 to 10.00.

[0009] Item 4. The specific surface area of ​​the pigment composition is 40 m 2 4. The pigment composition according to any one of items 1 to 3, wherein the content is 1 / g or more.

[0010] Item 5. The sieving speed of the pigment composition is 3.10 mg / (cm 2 5. The pigment composition according to any one of items 1 to 4, wherein the temperature is 100°C or more.

[0011] Item 6. An ink containing the pigment composition according to any one of items 1 to 5.

[0012] Item 7. A toner comprising the pigment composition according to any one of items 1 to 5.

[0013] Item 8. A paint comprising the pigment composition according to any one of items 1 to 5.

[0014] Item 9. A resin molded product comprising the pigment composition according to any one of items 1 to 5.

[0015] Item 10. A mixing step of obtaining a slurry of a pigment composition by mixing CI Pigment Yellow 180, a surfactant, and water; a heating step of heating the slurry, The method for producing a pigment composition, wherein the amount of the surfactant added is 1.5 to 7.5 parts by mass per 100 parts by mass of the CI Pigment Yellow 180. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a pigment composition that can be easily sieved and from which foreign matter can be easily removed. Furthermore, the pigment composition according to the present invention has good wettability with respect to the pigment solvent, and therefore when used in ink, it is possible to suppress an increase in the viscosity of the ink. DETAILED DESCRIPTION OF THE INVENTION

[0017] (CI Pigment Yellow 180) The pigment composition according to the present invention includes CI Pigment Yellow 180. CI Pigment Yellow 180 is a compound represented by the following formula (1). It should be noted that CI Pigment Yellow 180 is an azo-hydrazo tautomer, and therefore may contain both an azo form (-N=N-) and a hydrazo form (>N-NH-).

[0018] [ka]

[0019] CI Pigment Yellow 180 may be synthetic or commercially available. The content of CI Pigment Yellow 180 in 100% by mass of the pigment composition is preferably 93.0 to 98.5% by mass, preferably 93.5 to 98.0% by mass, and preferably 94.0 to 97.0% by mass, because if the content is too small, the coloring strength decreases, and if the content is too large, there is no room to add a treatment agent for the purpose of improving physical properties.

[0020] (surfactant) The pigment composition according to the present invention contains a surfactant. Examples of surfactants include anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants, but from the viewpoint of work efficiency during dispersion, nonionic surfactants are preferred. The nonionic surfactant is preferably a polyoxyalkylene alkyl ether, such as polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene tridecyl ether, polyoxyethylene polyoxypropylene branched decyl ether, polyoxyethylene lauryl ether, polyoxyethylene isodecyl ether, or polyoxyethylene polyoxypropylene oleyl cetyl ether.

[0021] The HLB value of the surfactant is preferably 1 to 19, preferably 2 to 18, preferably 5 to 15, and preferably 8 to 12, from the viewpoint of improving the adsorption to the pigment and the wettability of the pigment. In this specification, "HLB (Hydrophile-Lipophile Balance)" is a value proposed by Griffin that indicates the balance between hydrophilic and lipophilic groups in a surfactant molecule. This HLB value can be experimentally determined by comparing the emulsifying power of various surfactants, but can typically be calculated using the following formula 1. Formula 1: HLB value = 20 × weight % of hydrophilic portion of surfactant / molecular weight of surfactant

[0022] The cloud point of the surfactant is preferably 35°C or higher, preferably 35 to 100°C, and more preferably 60 to 80°C, from the viewpoint of avoiding phase separation of the surfactant and treating CI Pigment Yellow 180. As used herein, the term "cloud point" refers to the temperature at which an aqueous surfactant solution begins to lose transparency and turn cloudy when heated. The cloud point is measured under conditions selected from a 1% by mass aqueous solution of the surfactant, a 1% by mass aqueous solution (containing 5% by mass potassium sulfate), a 10% by mass aqueous solution (containing 25% by mass diethylene glycol monobutyl ether), etc., depending on the solubility of the surfactant in water.

[0023] The surfactants may be used alone or in combination of two or more. Moreover, commercially available surfactants can be used. The content of the surfactant in the pigment composition (100% by mass) is 1.5 to 7.0% by mass, preferably 2.0 to 6.5% by mass, and more preferably 3.0 to 6.0% by mass. If the content of the surfactant in 100% by mass of the pigment composition is less than 1.5% by mass, the pigment cannot be sufficiently wetted by the solvent, and therefore, when the pigment composition is used in an ink, an increase in the viscosity of the ink cannot be sufficiently suppressed. Furthermore, if the content of the surfactant in 100% by mass of the pigment composition exceeds 7.0% by mass, the surfactant attracts water molecules from the environment, causing many of the water molecules to adsorb onto the surface of the pigment powder. As a result, when the pigment composition is sieved, the powder particles of the pigment composition tend to clump together, clogging the sieve, slowing down the sieving speed and reducing work efficiency.

[0024] (Other ingredients) The pigment composition may contain other components, excluding CI Pigment Yellow 180 and surfactants, as needed, within the range that does not impair the effects of the present invention. Other components include pigment derivatives, inorganic pigments, dispersants, rosin, polycarboxylic acid compounds, and the like. Examples of the pigment derivatives include sulfonic acid pigment derivatives, amino group-containing pigment derivatives, and phthalimidomethyl group-containing pigment derivatives. Examples of the inorganic pigment include calcium carbonate, magnesium carbonate, precipitated barium sulfate, kaolin, clay, alumina white, and white carbon. Examples of the polycarboxylic acid compound include tartaric acid, succinic acid, citric acid, glutaric acid, adipic acid, oxalic acid, malic acid, aspartic acid, malonic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, aconitic acid, fumaric acid, mesaconic acid, isophthalic acid, terephthalic acid, trimesic acid, benzenetricarboxylic acid, methylisophthalic acid, hydroxyisophthalic acid, methylterephthalic acid, hydroxyterephthalic acid, and phenylene diacetic acid.

[0025] (Pigment composition) The hue of the pigment composition is preferably yellow (yellow pigment composition).

[0026] In a powder X-ray diffraction pattern of the pigment composition using CuKα characteristic X-rays, the ratio (h1 / h2) of the absolute intensity of X-ray diffraction at a Bragg angle 2θ=17.5°±0.2° (h1) to the absolute intensity of X-ray diffraction at the same Bragg angle 2θ=18.2°±0.2° (h2) is preferably 2.00 to 10.00, preferably 2.50 to 4.00, and preferably 2.50 to 3.75, since higher crystallinity leads to stronger solvent resistance and improved dispersion stability in ink, enabling the ink viscosity to be maintained low. The ratio (h1 / h2) of the absolute intensity (h1) of the X-ray diffraction at a Bragg angle 2θ = 17.5° ± 0.2° in the powder X-ray diffraction pattern using CuKα characteristic X-rays to the absolute intensity (h2) of the X-ray diffraction at the same Bragg angle 2θ = 18.2° ± 0.2° was measured using a multipurpose X-ray diffractometer, Empyrean (manufactured by Malvern Panalytical). First, the pigment composition was filled into a measurement cell, and the pigment powder was pressed onto a smooth glass plate (500 mL suction bell glass plate, manufactured by Shibata Scientific Co., Ltd.) with a finger from the opposite side of the measurement surface to smooth the measurement surface. The cell was then placed in the X-ray diffractometer and scanned at a scan step size of 0.0262 and a time per step rate of 4.59 to obtain a powder X-ray diffraction pattern. The maximum intensity of the peak at a Bragg angle 2θ = 17.5° ± 0.2° in the obtained powder X-ray diffraction pattern was defined as the absolute X-ray diffraction intensity (h1), and the minimum intensity of the valley at 2θ = 18.2° ± 0.2° was defined as the absolute X-ray diffraction intensity (h2), and the absolute intensity ratio (h1 / h2) was calculated.

[0027] The specific surface area of ​​the pigment composition is preferably 40 m from the viewpoint of the coloring power and dispersibility of the pigment composition. 2 / g or more, preferably 40 to 80m 2 / g, preferably 40 to 60m 2 / g. The specific surface area was measured by measuring the gas (nitrogen) adsorption amount by the single-point method using 200 mg of the pigment composition and a fully automatic specific surface area measuring device Macsorb HM model-1208 (manufactured by Mountec Co., Ltd.).

[0028] When producing a pigment composition or charging the pigment composition into a disperser, the pigment is passed through a sieve to prevent foreign matter from being mixed in, and there is concern that workability will be reduced if the sieve becomes clogged. However, the pigment composition according to the present invention is excellent in workability, for example, in sieving speed. The sieving speed of the pigment composition is preferably 3.10 mg / (cm ) from the viewpoint of work efficiency. 2 ·sec) or more, preferably 3.10 to 4.10 mg / (cm 2 ·sec), preferably 3.10 to 4.00 mg / (cm 2 · seconds). The sieving speed was measured as follows. First, 10.0 g of the pigment composition was placed on a sieve (manufactured by Fujiwara Seisakusho Co., Ltd., mesh size 355 μm, wire diameter 224 μm, diameter 10 cm), and the sieve was vibrated horizontally for 20 seconds at an amplitude of 5 cm and a vibration frequency of 3 Hz (3 strokes per second), and the weight of the pigment composition that passed through the sieve was measured. The sieving speed was then calculated by dividing the weight that passed through by the sieving time and the sieve area.

[0029] (Method of producing pigment composition) The pigment composition according to the present invention can be produced, for example, by a method for producing a pigment composition that includes at least a mixing step of mixing CI Pigment Yellow 180, a surfactant, and water to obtain a slurry of the pigment composition, and a heating step of heating the slurry, in which the amount of the surfactant added is 1.5 to 7.5 parts by mass per 100 parts by mass of the CI Pigment Yellow 180.

[0030] The amount of the surfactant added relative to 100 parts by mass of CI Pigment Yellow 180 is 1.5 to 7.5 parts by mass, preferably 2.0 to 7.0 parts by mass, and more preferably 3.5 to 6.5 parts by mass.

[0031] The mixing temperature in the mixing step is preferably 15 to 90°C, preferably 20 to 80°C, and preferably 20 to 40°C, in order to uniformly treat the pigment particle surfaces with the surfactant. The mixing time in the mixing step is preferably 0.1 to 180 minutes, preferably 0.2 to 120 minutes, and preferably 30 to 90 minutes, from the viewpoint of uniformly treating the pigment particle surfaces with the surfactant.

[0032] The amount of water used may be such that a slurry is obtained. The amount of water used is preferably 10 to 1000 parts by mass, preferably 10 to 100 parts by mass, and preferably 10 to 50 parts by mass relative to 1 part by mass of CI Pigment Yellow 180. Furthermore, the amount is preferably 50 to 10,000 parts by mass, preferably 100 to 5,000 parts by mass, preferably 150 to 2,000 parts by mass, and preferably 300 to 1,500 parts by mass relative to 1 part by mass of the surfactant.

[0033] The pH of the slurry of the pigment composition is preferably 9.5 to 11.5 from the viewpoint of extending the pigment particles and increasing the crystallinity. In this specification, pH refers to the value measured for a slurry of the pigment composition at 25° C. using a pH meter (trade name: Personal pH / ORP meter PH72, manufactured by Yokogawa Electric Corporation). The pH of the slurry of the pigment composition can be adjusted by using a basic compound. Examples of basic compounds include alkali metal hydroxides and alkaline earth metal hydroxides. Examples of the alkali metal hydroxide include sodium hydroxide and potassium hydroxide. Examples of alkaline earth metal hydroxides include calcium hydroxide. The basic compound may be used in an amount that will give the slurry a desired pH.

[0034] The mixing step can be carried out using a stirrer, mixer, shaker, rotator, homogenizer, or the like.

[0035] The heating temperature in the heating step is preferably 40 to 160°C, preferably 80 to 160°C, and preferably 120 to 150°C, from the viewpoint of uniformly treating the pigment particle surfaces with the surfactant and enhancing the crystallinity of the pigment. The heating time in the heating step is preferably 0.5 to 24 hours, preferably 1 to 12 hours, and more preferably 3 to 12 hours, from the viewpoint of uniformly treating the pigment particle surfaces with the surfactant and enhancing the crystallinity of the pigment. The heating step can be carried out using an autoclave, a mantle heater, a hot plate, a block bath, a water bath, an oil bath, a bead bath, an immersion heater, an electromagnetic heater, a microwave heater, steam blowing, or the like.

[0036] After the heating step, a filtration step of performing filtration, a water washing step of performing water washing, a drying step of performing drying, and a pulverization step of performing pulverization may be performed as necessary.

[0037] (ink) The ink according to the present invention is characterized by containing the above-mentioned pigment composition. Examples of inks include inks for lithographic printing, gravure inks, flexographic inks, metal inks, screen inks, UV inks, resist inks for producing color filters, and inkjet inks.

[0038] (toner) The toner according to the present invention is characterized by containing the above-mentioned pigment composition. The toner is preferably a toner for developing electrostatic images. Examples of toners for developing electrostatic images include one-component magnetic toners (color toners for magnetic one-component development) that contain a magnetic material in the toner, two-component magnetic toners (color toners for magnetic two-component development) that are charged by mixed friction with a magnetic carrier, one-component non-magnetic color toners (color toners for non-magnetic one-component development) that do not contain a magnetic material, and two-component non-magnetic color toners (color toners for non-magnetic two-component development) that are mixed with a carrier.

[0039] (paint) The paint according to the present invention is characterized by containing the above-mentioned pigment composition. Examples of paints include architectural paints, automotive paints, automotive repair paints, marine paints, general industrial paints, and woodwork paints.

[0040] (Resin molded body) The resin molded product according to the present invention is characterized by containing the above-mentioned pigment composition. Examples of resin molded bodies include thermoplastic resin molded bodies and thermosetting resin molded bodies, and specific examples include polyester resin, polyamide resin, styrene resin (PS resin, AS resin, ABS resin, etc.), acrylic resin, polyolefin resin (polyethylene resin, polyester resin, etc.), polyalkylene terephthalate resin (polyethylene terephthalate resin, polybutylene terephthalate resin, etc.), polyvinyl chloride resin, methylpentene resin, polycarbonate resin, polyurethane resin, polyacetal resin, fluororesin (PTFE resin, etc.), polyethersulfone resin, polyphenylene sulfide resin, polyetheretherketone resin, etc. [Example]

[0041] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0042] (Production Example 1) Preparation of Crude Wet Cake of CI Pigment Yellow 180 225 parts by mass of 1,2-bis(2-aminophenoxy)-ethane was dispersed in 3,300 parts by mass of water, and then 538.5 parts by mass of 35% by mass hydrochloric acid was added. While ice was added to maintain the temperature below 5°C, 337 parts by mass of a 40% by mass aqueous solution of sodium nitrite was added dropwise to prepare a diazo component. Next, 455 parts by mass of 5-acetoacetylamino-benzimidazolone was dispersed in 3,400 parts by mass of water, and then 595 parts by mass of a 25% by mass aqueous solution of sodium hydroxide was added and dissolved to obtain a coupler component. The liquid volumes of the diazo component and coupler component were adjusted to 6,500 parts by mass and 4,500 parts by mass, respectively, by adding water and ice. Next, 30.6 parts by mass of 90% by mass acetic acid was added to 6,500 parts by mass of water, and the temperature of this acetic acid solution was adjusted to 20°C. Then, a portion of the coupler component was added dropwise to the acetic acid solution to adjust the pH to 6.0. Thereafter, the diazo component was started to be added dropwise to the acetic acid solution at a constant rate. In order to prevent the presence of an excess of diazonium salt in the acetic acid solution, the dropwise addition of the remaining coupler components was started simultaneously with the dropwise addition of the diazo component, and the coupling was carried out while maintaining the pH of the acetic acid solution at 6.0 by adjusting the dropwise addition rate of the coupler components. During the coupling, ice or a 5% by mass sodium hydroxide solution was added at appropriate times to maintain the temperature of the reaction solution at 20°C and the pH at 6.0. After the dropwise addition of the coupler component and the diazo component was completed in about 3 hours, the reaction solution was heated to 90°C and maintained at that temperature for 1 hour. Next, the mixture was filtered and washed with water to obtain a wet cake of crude CI Pigment Yellow 180. The solid content of the wet cake of crude CI Pigment Yellow 180 was 34.1% by mass.

[0043] Example 1: Preparation of Yellow Pigment Composition 1 A 2L beaker was charged with 103 parts by weight of CI Pigment Yellow 180 crude wet cake (34.1% solids), 660 parts by weight of water, and 0.70 parts by weight of a nonionic surfactant (polyoxyethylene lauryl ether, HLB value: 10.8, cloud point: 69°C (measured as a 10% by weight aqueous solution containing 25% by weight of diethylene glycol monobutyl ether)). The mixture was stirred at 25°C for 1 hour using an anchor-type stirring blade A-80 (manufactured by AS ONE Corporation). A 5% by weight aqueous sodium hydroxide solution was added to adjust the pH to 10.5, producing a yellow pigment composition slurry. The amount of water in the resulting yellow pigment composition slurry was 21 parts by weight per part by weight of CI Pigment Yellow 180, and 1,040 parts by weight per part by weight of nonionic surfactant. Next, the pigment slurry was transferred to a 1 L autoclave (manufactured by Taiatsu Glass Industry Co., Ltd.), heated to 140°C over 3 hours, and maintained at 140°C for 7 hours. After cooling to room temperature, the mixture was filtered and washed with water, and the resulting wet cake of the yellow pigment composition was dried at 100° C. for 12 hours in a constant temperature blower dryer WFO-520 (manufactured by Tokyo Rikakikai Co., Ltd.). Next, the entire amount of the obtained dried lump was placed in a large mill cup (volume 200 mL) of a portable laboratory mill LAB MILL (manufactured by Osaka Chemical Co., Ltd.) and milled for 30 seconds to obtain Yellow Pigment Composition 1.

[0044] Example 2: Preparation of Yellow Pigment Composition 2 Yellow pigment composition 2 was obtained by carrying out the same procedure as in Example 1, except that the amount of the nonionic surfactant added in Example 1 was changed to 1.40 parts by mass. In the slurry of the yellow pigment composition, the amount of water was 21 parts by mass per part by mass of CI Pigment Yellow 180, and 520 parts by mass per part by mass of the nonionic surfactant.

[0045] Example 3: Preparation of Yellow Pigment Composition 3 Yellow pigment composition 3 was obtained by carrying out the same procedure as in Example 1, except that the amount of the nonionic surfactant added in Example 1 was changed to 2.10 parts by mass. In the slurry of the yellow pigment composition, the amount of water was 21 parts by mass per part by mass of CI Pigment Yellow 180, and 345 parts by mass per part by mass of the nonionic surfactant.

[0046] Example 4: Preparation of Yellow Pigment Composition 4 Yellow pigment composition 4 was obtained by carrying out the same procedure as in Example 1, except that the amount of the nonionic surfactant added in Example 1 was changed to 1.23 parts by mass. In the slurry of the yellow pigment composition, the amount of water was 21 parts by mass per part by mass of CI Pigment Yellow 180, and 594 parts by mass per part by mass of the nonionic surfactant.

[0047] (Comparative Example 1) Preparation of Yellow Pigment Composition A A yellow pigment composition A was obtained in the same manner as in Example 1, except that the amount of nonionic surfactant added in Example 1 was changed to zero. In the slurry of the yellow pigment composition, the amount of water was 21 parts by mass relative to 1 part by mass of CI Pigment Yellow 180.

[0048] (Comparative Example 2) Preparation of Yellow Pigment Composition B A yellow pigment composition B was obtained by carrying out the same procedure as in Example 1, except that the amount of the nonionic surfactant added in Example 1 was changed to 2.80 parts by mass. In the slurry of the yellow pigment composition, the amount of water was 21 parts by mass per part by mass of CI Pigment Yellow 180, and 260 parts by mass per part by mass of the nonionic surfactant.

[0049] <Evaluation of pigment composition> The absolute intensity ratio (h1 / h2) in X-ray diffraction, specific surface area, sieving speed and ink viscosity of the produced pigment composition were measured. The results are shown in Table 1. The ink viscosity was measured as follows. First, 6.0 g of the yellow pigment composition, 24.0 g of polyamide (PA) gravure varnish (manufactured by DIC Corporation), 4.2 g of toluene (manufactured by Kanto Chemical Co., Ltd.), 0.9 g of ethyl acetate (manufactured by Kanto Chemical Co., Ltd.), 0.9 g of isopropanol (manufactured by Kanto Chemical Co., Ltd.), and 120 g of 1 / 8-inch steel beads (manufactured by Mochigi Steel Ball Bearing Co., Ltd.) were placed in a 100 mL polyethylene wide-mouth bottle and dispersed for 30 minutes using a paint shaker (manufactured by Toyo Seiki Seisakusho Co., Ltd.). Next, 12.0 g of polyamide gravure varnish (manufactured by DIC Corporation) and 12.0 g of nitrocellulose (NC) varnish (manufactured by DIC Corporation) were added and dispersed for 5 minutes to obtain a PA / NC ink. The prepared PA / NC ink was transferred to a glass bottle (tableware bottle M-70, manufactured by Kakuyo Glass Co., Ltd.) and left to stand at 50°C for 7 days in a multi-safety dryer MSO-45TPH (manufactured by Futaba Chemical Co., Ltd.). Next, the PA / NC ink was left to stand in a thermostatic chamber at 20°C for at least 1 hour, after which the ink viscosity was measured using an R85 ​​type viscometer RB85L (manufactured by Toki Sangyo Co., Ltd.) at a rotation speed of 60 rpm.

[0050] [Table 1]

[0051] From the Examples and Comparative Examples, it was confirmed that the pigment composition according to the present invention has a good sieving speed. Furthermore, it was confirmed that the pigment has good wettability with respect to solvents, and therefore when used in ink, an increase in the viscosity of the ink can be suppressed. [Industrial Applicability]

[0052] The pigment composition of the present invention can be used in inks, toners, paints, and resin molded products.

Claims

1. A pigment composition comprising C.I. Pigment Yellow 180 and a surfactant, the surfactant is selected from the group consisting of polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene tridecyl ether, polyoxyethylene polyoxypropylene branched decyl ether, polyoxyethylene lauryl ether, polyoxyethylene isodecyl ether, and polyoxyethylene polyoxypropylene oleyl cetyl ether; the content of the surfactant in 100% by mass of the pigment composition is 1.5 to 7.0% by mass, The pigment composition has a ratio (h1 / h2) of the absolute intensity (h1) of X-ray diffraction at a Bragg angle 2θ=17.5°±0.2° to the absolute intensity (h2) of X-ray diffraction at the same Bragg angle 2θ=18.2°±0.2° in a powder X-ray diffraction pattern using CuKα characteristic X-rays, of 2.50 to 3.

75.

2. The pigment composition according to claim 1, wherein the content of C. I. Pigment Yellow 180 in 100% by mass of the pigment composition is 93.0 to 98.5% by mass.

3. A pigment composition described in claim 1 or 2, wherein the surfactant is polyoxyethylene lauryl ether.

4. 3. The pigment composition according to claim 1, wherein the specific surface area of ​​the pigment composition is 40 to 60 m 2 / g.

5. The sieving rate of the pigment composition is 3.10 mg / (cm ２ 3. The pigment composition according to claim 1, wherein the viscosity is 100 s or more.

6. An ink comprising the pigment composition according to claim 1 or 2.

7. A toner comprising the pigment composition according to claim 1 or 2.

8. A paint comprising the pigment composition according to claim 1 or 2.

9. A resin molded product comprising the pigment composition according to claim 1 or 2.

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