Pigment composition, method for producing the same, and ink, toner, paint, and resin-molded body

Abstract

The present invention aims to provide a pigment composition that is easy to sieve, easy to remove foreign matter, and capable of suppressing the increase of ink viscosity when used in inks. Specifically, it provides a pigment composition and inks, toners, coatings, and resin molded articles using the same, the pigment composition comprising CI Pigment Yellow 180 and a surfactant, wherein the surfactant is present in a content of 1.5 to 7.0% by mass in 100% by mass of the pigment composition. Additionally, a method for manufacturing a pigment composition includes at least: a mixing step, wherein CI Pigment Yellow 180, a surfactant, and water are mixed to obtain a slurry of the pigment composition; and a heating step, wherein the slurry is heated, and the amount of surfactant added is 1.5 to 7.5 parts by mass relative to 100 parts by mass of CI Pigment Yellow 180.

Description

Technical Field

[0001] This invention relates to pigment compositions and methods for manufacturing the same, as well as inks, toners, coatings, and resin molded articles. Background Technology

[0002] Given the safety concerns surrounding many yellow pigments, CI Pigment Yellow 180 is widely used in various applications, including inks, coatings, plastics, toners, and inkjet inks, due to its high safety and strong resistance to weathering and other factors.

[0003] Furthermore, due to its various applications, CI Pigment Yellow 180 has been used in attempts to improve its physical properties (Patent Document 1).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-201379 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In Patent Document 1, the physical properties of CI Pigment Yellow 180 are improved by adjusting the pH during the coupling reaction or by using a surface treatment agent, but there is still room for improvement. For example, polyoxyalkylene ether treatment is performed to improve the wettability of the pigment. On the other hand, if polyoxyalkylene ether is present, the sieving speed of the yellow pigment composition is reduced, resulting in a decrease in the efficiency of the dispersion process.

[0009] Therefore, the objective of this invention is to provide a pigment composition that is easy to sieve, easy to remove foreign matter, and capable of suppressing the increase in ink viscosity when used in ink.

[0010] Solution for solving the problem

[0011] The inventors conducted in-depth research and found that the above-mentioned problems could be solved by using CI Pigment Yellow 180 and a specified amount of surfactant, thus completing the present invention.

[0012] As an example of the structure of the present invention that solves the above-mentioned problems, it is described below.

[0013] Option 1. A pigment composition comprising CI Pigment Yellow 180 and a surfactant, wherein the surfactant is present in a content of 1.5 to 7.0% by mass in 100% by mass of the pigment composition.

[0014] Option 2. The pigment composition according to Option 1, wherein the surfactant is a nonionic surfactant.

[0015] Option 3. The pigment composition according to Option 1 or 2, wherein the ratio (h1 / h2) of the absolute intensity of X-ray diffraction of the pigment composition at a Bragg angle of 2θ = 17.5° ± 0.2° to the absolute intensity of X-ray diffraction at a Bragg angle of 2θ = 18.2° ± 0.2° in a powder X-ray diffraction pattern utilizing CuKα characteristic X-rays is 2.00 to 10.00.

[0016] Option 4. A pigment composition according to any one of Options 1 to 3, wherein the specific surface area of ​​the pigment composition is 40 m². 2 / g or more.

[0017] Option 5. A pigment composition according to any one of Options 1 to 4, wherein the sieving speed of the pigment composition is 3.10 mg / (cm²). 2 · seconds) or more.

[0018] Scheme 6. An ink comprising any one of the pigment compositions described in Schemes 1 to 5.

[0019] Scheme 7. A toner comprising the pigment composition described in any one of Schemes 1 to 5.

[0020] Scheme 8. A coating comprising any one of the pigment compositions described in Schemes 1 to 5.

[0021] Scheme 9. A resin molded article comprising any one of Schemes 1 to 5.

[0022] Option 10. A method for manufacturing a pigment composition, comprising at least: a mixing step, wherein a slurry of the pigment composition is obtained by mixing CI Pigment Yellow 180, a surfactant and water; and a heating step, wherein the slurry is heated, wherein the amount of surfactant added is 1.5 to 7.5 parts by mass relative to 100 parts by mass of the CI Pigment Yellow 180.

[0023] Invention Effects

[0024] According to the present invention, a pigment composition that is easy to sieve and easy to remove foreign matter can be provided.

[0025] Furthermore, the pigment composition of the present invention has good wettability to solvents, thus suppressing the increase in ink viscosity when used in inks. Detailed Implementation

[0026] (CI Pigment Yellow 180)

[0027] The pigment composition of the present invention comprises CI Pigment Yellow 180.

[0028] CI Pigment Yellow 180 is a compound represented by the following formula (1).

[0029] It should be noted that since CI Pigment Yellow 180 is an azo-hydrazone tautomer, it can contain both the azo form (-N=N-) and the hydrazone form (>N-NH-).

[0030] [Chemistry 1]

[0031]

[0032] CI Pigment Yellow 180 can be either synthetic or commercially available.

[0033] If the content of CI Pigment Yellow 180 in the pigment composition is too small, the tinting strength will decrease. If it is too large, there is no room for adding a treatment agent for the purpose of improving physical properties. Therefore, it is preferred to be 93.0 to 98.5% by mass, preferably 93.5 to 98.0% by mass, and preferably 94.0 to 97.0% by mass.

[0034] (surfactant)

[0035] The pigment compositions of the present invention contain surfactants.

[0036] As surfactants, anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants can be cited. From the viewpoint of working efficiency during dispersion, nonionic surfactants are preferred.

[0037] As a nonionic surfactant, polyoxyethylene alkyl ethers are preferred. Among the polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene tridecyl ether, polyoxyethylene polyoxypropylene branched decyl ether, polyoxyethylene lauryl ether, polyoxyethylene isodecyl ether, and polyoxyethylene polyoxypropylene oleyl alcohol hexadecyl ether are preferred.

[0038] From the viewpoint of improving the adsorption and wetting properties of pigments, the HLB value of the surfactant is preferably 1 to 19, preferably 2 to 18, preferably 5 to 15, and preferably 8 to 12.

[0039] In this specification, "HLB (Hydrophile-Lipophile Balance)" represents the balance between the hydrophilic and lipophilic groups in a surfactant molecule, as proposed by Griffin. This HLB value can be experimentally determined by comparing the emulsifying power of various surfactants, typically by Equation 1 below.

[0040] Formula 1: HLB value = 20 × weight % of hydrophilic portion of surfactant / molecular weight of surfactant

[0041] From the viewpoint of avoiding phase separation of surfactants and processing CI pigment yellow 180, the cloud point of the surfactant is preferably above 35°C, preferably 35~100°C, and preferably 60~80°C.

[0042] In this specification, "cloud point" refers to the temperature at which the transparency of an aqueous solution of a surfactant decreases and it begins to turn white and cloudy when heated.

[0043] The determination of cloud point is based on the solubility of the surfactant in water, and is carried out under conditions such as 1% by mass aqueous solution of the surfactant, 1% by mass aqueous solution (containing 5% by mass potassium sulfate), and 10% by mass aqueous solution (containing 25% by mass diethylene glycol monobutyl ether).

[0044] Surfactants can be used alone or in combination with two or more.

[0045] Alternatively, commercially available surfactants can be used.

[0046] The surfactant content in the pigment composition 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.

[0047] When the surfactant content in the pigment composition is less than 1.5% by mass, the wettability of the pigment to the solvent cannot be adequately ensured. Therefore, when the pigment composition is used in ink, the viscosity increase of the ink cannot be adequately suppressed.

[0048] Furthermore, when the surfactant content in the pigment composition exceeds 7.0% by mass (100% by mass), the surfactant attracts water molecules from the environment, resulting in a large amount of water molecules adsorbing onto the surface of the pigment powder. Consequently, during sieving of the pigment composition, the pigment powder tends to aggregate, causing clogging of the sieve mesh, reducing sieving speed, and decreasing operational efficiency.

[0049] (Other ingredients)

[0050] The pigment composition may include other components besides CI Pigment Yellow 180 and surfactants as needed, without compromising the effectiveness of the invention.

[0051] Other components include pigment derivatives, inorganic pigments, dispersants, rosin, and polycarboxylic acid compounds.

[0052] Examples of pigment derivatives include sulfonic acid pigment derivatives, amino-containing pigment derivatives, and pigment derivatives containing phthalimide methyl groups.

[0053] Examples of inorganic pigments include calcium carbonate, magnesium carbonate, precipitating barium sulfate, kaolin, clay, alumina white, and silica.

[0054] Examples of polycarboxylic acid compounds include tartaric acid, succinic acid, citric acid, glutaric acid, adipic acid, oxalic acid, malic acid, aspartic acid, malonic acid, pimelic acid, octanoic acid, azelaic acid, sebacic acid, aconitic acid, fumaric acid, medoconic acid, isophthalic acid, terephthalic acid, pyromellitic acid, phenyltriphthalic acid, methyl isophthalic acid, hydroxy isophthalic acid, methyl terephthalic acid, hydroxy terephthalic acid, and phenyl diacetic acid.

[0055] (Pigment composition)

[0056] The preferred hue of the pigment composition is yellow (yellow pigment composition).

[0057] Regarding the ratio (h1 / h2) of the absolute intensity of X-ray diffraction at a Bragg angle of 2θ = 17.5° ± 0.2° to the absolute intensity of X-ray diffraction at a Bragg angle of 2θ = 18.2° ± 0.2° in the powder X-ray diffraction pattern using CuKα characteristic X-rays, since higher crystallinity results in stronger solvent resistance and higher dispersion stability in inks, and can maintain a lower ink viscosity, it is preferably 2.00 to 10.00, preferably 2.50 to 4.00, and preferably 2.50 to 3.75.

[0058] The ratio (h1 / h2) of the absolute intensity of X-ray diffraction at a Bragg angle of 2θ = 17.5° ± 0.2° to that at a Bragg angle of 2θ = 18.2° ± 0.2° in the powder X-ray diffraction pattern using CuKα characteristic X-rays was determined using a multi-purpose X-ray diffractometer, Empyrean (manufactured by Malvern Panalytical).

[0059] First, the pigment composition is filled into the measuring cell. The pigment powder is pressed onto a smooth glass plate (a 500mL suction clock glass plate, manufactured by Shibata Scientific Co., Ltd.) from the opposite side of the measuring surface using a finger to smooth the surface. The plate is then placed in an X-ray diffraction apparatus and scanned at a scan step size of 0.0262 and a time per step of 4.59 to obtain a powder X-ray diffraction pattern. The highest intensity in the mountainous region (2θ = 17.5° ± 0.2°) of the obtained powder X-ray diffraction pattern is taken as the absolute intensity of the X-ray diffraction (h1), and the lowest intensity in the valley region (2θ = 18.2° ± 0.2°) is taken as the absolute intensity of the X-ray diffraction (h2). The absolute intensity ratio (h1 / h2) is then calculated.

[0060] From the viewpoint of the tinting strength and dispersibility of the pigment composition, the specific surface area of ​​the pigment composition is preferably 40 m². 2 / g or more, preferably 40~80m 2 / g, preferably 40~60m 2 / g.

[0061] The specific surface area was determined using 200 mg of the pigment composition and a fully automated specific surface area measuring device, Macsorb HMmodel-1208 (manufactured by Mounttech Co., Ltd.), by measuring the amount of gas (nitrogen) adsorbed based on the one-point method.

[0062] When manufacturing pigment compositions, and when loading pigment compositions into a disperser, there is a concern that if the sieve becomes clogged, the operability will be reduced, since the pigment composition is being passed through a sieve to deal with foreign matter. However, the pigment compositions of the present invention have excellent operability, such as sieving speed.

[0063] From the perspective of operational efficiency, the preferred sieving speed of the pigment composition is 3.10 mg / (cm²). 2 ·second) or higher, preferably 3.10~4.10 mg / (cm³) 2 (·second), preferably 3.10~4.00 mg / (cm³) 2 ·Second).

[0064] The sieving speed was determined as follows.

[0065] First, 10.0g of the pigment composition was placed on a sieve (made by Fujiwara Corporation, with a mesh size of 355μm, a wire diameter of 224μm, and a diameter of 10cm), and the sieve was vibrated laterally for 20 seconds at an amplitude of 5cm and a vibration frequency of 3Hz (3 reciprocations per second). The weight of the pigment composition passing through the sieve was measured.

[0066] Next, the weight passing through is divided by the sieving time and the area of ​​the sieve to determine the sieving speed.

[0067] (Method for manufacturing pigment composition)

[0068] The pigment composition of the present invention can be manufactured, for example, by the following method of manufacturing a pigment composition, which includes at least: a mixing step, wherein CI pigment yellow 180, a surfactant and water are mixed to obtain a slurry of the pigment composition; and a heating step, wherein the slurry is heated, and the amount of surfactant added is 1.5 to 7.5 parts by weight relative to 100 parts by weight of CI pigment yellow 180.

[0069] The amount of surfactant added relative to 100 parts by weight of CI Pigment Yellow 180 is 1.5 to 7.5 parts by weight, preferably 2.0 to 7.0 parts by weight, and more preferably 3.5 to 6.5 parts by weight.

[0070] From the viewpoint of uniformly treating the surfactant on the surface of pigment particles, the mixing temperature in the mixing process is preferably 15~90℃, preferably 20~80℃, and preferably 20~40℃.

[0071] From the viewpoint of uniformly treating the surfactant on the surface of the pigment particles, the mixing time in the mixing process is preferably 0.1 to 180 minutes, preferably 0.2 to 120 minutes, and preferably 30 to 90 minutes.

[0072] The amount of water used can be the amount sufficient to obtain a slurry.

[0073] The amount of water used relative to 1 part by weight of CI Pigment Yellow 180 is preferably 10 to 1000 parts by weight, preferably 10 to 100 parts by weight, and preferably 10 to 50 parts by weight.

[0074] In addition, relative to 1 part by mass of surfactant, it 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.

[0075] From the viewpoint of stretching pigment particles to improve crystallinity, the pH of the pigment composition slurry is preferably 9.5 to 11.5.

[0076] In this manual, pH refers to the value measured using a pH meter (trade name: Personal pH / ORP meter PH72, manufactured by Yokogawa Electric Corporation) when the pigment composition slurry is at 25°C.

[0077] The pH of the pigment composition slurry can be adjusted by using an alkaline compound.

[0078] Examples of alkaline compounds include alkali metal hydroxides and alkaline earth metal hydroxides.

[0079] Examples of alkali metal hydroxides include sodium hydroxide and potassium hydroxide.

[0080] In addition, calcium hydroxide is an example of an alkaline earth metal hydroxide.

[0081] For alkaline compounds, the amount of slurry used should be adjusted to achieve the target pH.

[0082] The mixing process can be carried out using mixers, blenders, vibrators, rotators, homogenizers, etc.

[0083] From the viewpoint of uniformly treating the surfactant on the surface of pigment particles and improving the crystallinity of the pigment, the heating temperature in the heating process is preferably 40~160℃, preferably 80~160℃, and preferably 120~150℃.

[0084] From the viewpoint of uniformly treating the surfactant on the surface of pigment particles and improving the crystallinity of the pigment, the heating time in the heating process is preferably 0.5 to 24 hours, preferably 1 to 12 hours, and preferably 3 to 12 hours.

[0085] The heating process can be carried out using autoclaves, jacketed heaters, hot plates, block baths, water baths, oil baths, bead baths, immersion heaters, electromagnetic heaters, microwave heaters, steam blowing, etc.

[0086] After the heating process, the following processes may be performed as needed: filtration, washing, drying, and pulverizing.

[0087] (Ink)

[0088] The ink of the present invention is characterized by comprising the above-described pigment composition.

[0089] Examples of inks include offset printing inks, gravure inks, flexographic inks, metallic inks, screen printing inks, UV inks, resist inks for making color filters, and inkjet inks.

[0090] (Toner)

[0091] The colorant of the present invention is characterized by comprising the above-described pigment composition.

[0092] As a toner, a toner for electrostatic image development is preferred.

[0093] Examples of toners for electrostatic image development include single-component magnetic toners containing magnetic materials (magnetic single-component color toners for development), two-component magnetic toners that are charged through mixing and friction with a magnetic carrier (magnetic two-component color toners for development), single-component non-magnetic color toners without magnetic materials (non-magnetic single-component color toners for development), and two-component non-magnetic color toners mixed with a carrier (non-magnetic two-component color toners for development).

[0094] (coating)

[0095] The coating of the present invention is characterized by comprising the above-described pigment composition.

[0096] As coatings, examples include architectural coatings, automotive coatings, automotive repair coatings, marine coatings, general industrial coatings, and woodworking coatings.

[0097] (Resin molded body)

[0098] The resin molded articles of the present invention are characterized by comprising the above-described pigment composition.

[0099] Examples of resin molded bodies include thermoplastic resin molded bodies and thermosetting resin molded bodies. 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, fluoropolymer resin (PTFE resin, etc.), polyethersulfone resin, polyphenylene sulfide resin, and polyetheretherketone resin.

[0100] Example

[0101] The present invention will be described in more detail below with examples, but the present invention is not limited to the following examples.

[0102] (Example 1) Preparation of coarse wet cake of CI pigment yellow 180

[0103] Disperse 225 parts by mass of 1,2-bis(2-aminophenoxy)-ethane in 3300 parts by mass of water, then add 538.5 parts by mass of 35% hydrochloric acid. While adding ice to keep the temperature below 5°C, add 337 parts by mass of 40% sodium nitrite aqueous solution dropwise to prepare the diazo component.

[0104] Next, 455 parts by weight of 5-acetylacetylamino-benzimidazolone were dispersed in 3400 parts by weight of water, and then 595 parts by weight of 25% sodium hydroxide aqueous solution were added to dissolve it, thus obtaining the coupling agent component.

[0105] Regarding the diazo component and coupling agent component, water and ice were added to adjust the liquid volume to 6500 parts by mass and 4500 parts by mass, respectively.

[0106] Next, 30.6 parts by mass of 90% acetic acid were added to 6500 parts by mass of water, and the temperature of the acetic acid solution was adjusted to 20°C. Then, a portion of the coupling agent component was added dropwise to the acetic acid solution until the pH reached 6.0. Then, the diazo component was added dropwise to the acetic acid solution at a controlled rate.

[0107] It should be noted that, in order to prevent excessive diazonium salt in the acetic acid solution, the remaining coupling agent is added dropwise at the same time as the diazonium component. By adjusting the dropwise rate of the coupling agent, coupling is carried out while maintaining the pH of the acetic acid solution at 6.0.

[0108] In the coupling process, in order to maintain the temperature of the reaction solution at 20°C and the pH at 6.0, ice or 5% sodium hydroxide solution was added as needed, and the addition of the coupling agent and diazo components was completed in about 3 hours. Then the temperature was heated to 90°C and maintained for 1 hour.

[0109] Next, the mixture was filtered and washed with water to obtain a coarse wet cake of CI Pigment Yellow 180. The solid content of the coarse wet cake of CI Pigment Yellow 180 was 34.1% by mass.

[0110] (Example 1) Preparation of Yellow Pigment Composition 1

[0111] In a 2L beaker, 103 parts by weight of CI Pigment Yellow 180 coarse wet cake (34.1% by weight of solids), 660 parts by weight of water, and 0.70 parts by weight of nonionic surfactant (polyoxyethylene lauryl ether, HLB value: 10.8, cloud point: 69°C (measured when 10% by weight aqueous solution contains 25% by weight of diethylene glycol monobutyl ether)) were added. The mixture was stirred at 25°C for 1 hour using an anchor-type stirrer A-80 (manufactured by AS ONE Co., Ltd.). Then, 5% by weight of sodium hydroxide aqueous solution was added, thereby obtaining a slurry of yellow pigment composition with pH adjusted to 10.5. In the obtained slurry of yellow pigment composition, the amount of water was 21 parts by weight relative to 1 part by weight of CI Pigment Yellow 180, and the amount of nonionic surfactant was 1040 parts by weight relative to 1 part by weight.

[0112] Next, the pigment slurry was transferred to a 1L autoclave (manufactured by Pressure Glass Industry Co., Ltd.), heated to 140°C over 3 hours, and maintained at 140°C for 7 hours.

[0113] Then, after cooling to room temperature, the mixture is filtered and washed with water. The resulting wet cake of yellow pigment composition is dried at 100°C for 12 hours using a WFO-520 constant temperature dryer (manufactured by Tokyo Rika Kiki Co., Ltd.).

[0114] Next, all the obtained dried lumps were placed into the large grinding cup (200mL capacity) of the LAB MILL portable laboratory grinder (manufactured by Osaka Chemical Co., Ltd.), and ground for 30 seconds to obtain yellow pigment composition 1.

[0115] (Example 2) Preparation of Yellow Pigment Composition 2

[0116] Except for changing the amount of nonionic surfactant added in Example 1 to 1.40 parts by weight, the same operation as in Example 1 was performed to obtain yellow pigment composition 2.

[0117] It should be noted that in the slurry of the yellow pigment composition, the amount of water is 21 parts by mass relative to 1 part by mass of CI pigment yellow 180, and 520 parts by mass relative to 1 part by mass of nonionic surfactant.

[0118] (Example 3) Preparation of Yellow Pigment Composition 3

[0119] Except for changing the amount of nonionic surfactant added in Example 1 to 2.10 parts by weight, the same operation as in Example 1 was performed to obtain yellow pigment composition 3.

[0120] It should be noted that in the slurry of the yellow pigment composition, the amount of water is 21 parts by mass relative to 1 part by mass of CI pigment yellow 180, and 345 parts by mass relative to 1 part by mass of nonionic surfactant.

[0121] (Example 4) Preparation of Yellow Pigment Composition 4

[0122] Except for changing the amount of nonionic surfactant added in Example 1 to 1.23 parts by mass, the same operation as in Example 1 was performed to obtain yellow pigment composition 4.

[0123] It should be noted that in the slurry of the yellow pigment composition, the amount of water is 21 parts by mass relative to 1 part by mass of CI pigment yellow 180, and 594 parts by mass relative to 1 part by mass of nonionic surfactant.

[0124] (Comparative Example 1) Preparation of Yellow Pigment Composition A

[0125] Except that the amount of nonionic surfactant added in Example 1 was zero, the same operation as in Example 1 was performed to obtain yellow pigment composition A.

[0126] It should be noted that in the slurry of the yellow pigment composition, the amount of water is 21 parts by mass relative to 1 part by mass of CI Pigment Yellow 180.

[0127] (Comparative Example 2) Preparation of Yellow Pigment Composition B

[0128] Except for changing the amount of nonionic surfactant added in Example 1 to 2.80 parts by weight, the same operation as in Example 1 was performed to obtain yellow pigment composition B.

[0129] It should be noted that in the slurry of the yellow pigment composition, the amount of water is 21 parts by mass relative to 1 part by mass of CI pigment yellow 180, and 260 parts by mass relative to 1 part by mass of nonionic surfactant.

[0130] <Evaluation of Pigment Compositions>

[0131] The ratio of absolute intensity (h1 / h2), specific surface area, sieving speed, and ink viscosity of the manufactured pigment composition were determined by X-ray diffraction.

[0132] The results are shown in Table 1.

[0133] It should be noted that the ink viscosity was measured as follows.

[0134] First, place 6.0g of yellow pigment composition, 24.0g of polyamide (PA) gravure varnish (manufactured by DIC Corporation), 4.2g of toluene (manufactured by Kanto Chemical Co., Ltd.), 0.9g of ethyl acetate (manufactured by Kanto Chemical Co., Ltd.), 0.9g of isopropanol (manufactured by Kanto Chemical Co., Ltd.), and 120g of 1 / 8-inch steel balls (manufactured by Chiki Steel Ball Bearing Co., Ltd.) into a 100mL polyethylene wide-mouth bottle and disperse for 30 minutes using a paint stirrer (manufactured by Toyo Seiki Co., Ltd.).

[0135] Next, 12.0g of polyamide gravure varnish (manufactured by DIC Corporation) and 12.0g of nitrocellulose (NC) varnish (manufactured by DIC Corporation) were added and dispersed for 5 minutes to obtain PA / NC ink.

[0136] The prepared PA / NC ink was transferred to a glass bottle (M-70 cutlery bottle, manufactured by Kashiwagawa Glass Co., Ltd.) and placed in a multi-safety desiccator MSO-45TPH (manufactured by Futaba Chemical Co., Ltd.) at 50°C for 7 days. Next, the PA / NC ink was placed in a constant temperature bath at 20°C for at least 1 hour, and the ink viscosity was measured using an R85 ​​type viscometer RB85L (manufactured by Toki Sangyo Co., Ltd.) at a rotation speed of 60 rpm.

[0137] Table 1

[0138]

[0139] The examples and comparative examples confirm that the pigment composition of the present invention has a good sieving speed.

[0140] In addition, it was confirmed that because the pigment has good wettability to solvents, it can suppress the increase in ink viscosity when used in ink.

[0141] Industrial utilization potential

[0142] The pigment compositions of the present invention can be used in inks, toners, coatings, and resin molded articles.

Claims

1. A pigment composition comprising CI Pigment Yellow 180 and a surfactant, The surfactant is present in a content of 1.5 to 7.0% by mass in 100% by mass of the pigment composition.

2. The pigment composition according to claim 1, wherein, The surfactant is a nonionic surfactant.

3. The pigment composition according to claim 1 or 2, wherein, The ratio of the absolute intensity h1 of the X-ray diffraction of the pigment composition at a Bragg angle of 2θ = 17.5° ± 0.2° to the absolute intensity h2 of the X-ray diffraction at a Bragg angle of 2θ = 18.2° ± 0.2° in the powder X-ray diffraction pattern using CuKα characteristic X-rays, h1 / h2, is 2.00~10.

00.

4. The pigment composition according to any one of claims 1 to 3, wherein, The specific surface area of ​​the pigment composition is 40 m². 2 / g or more.

5. The pigment composition according to any one of claims 1 to 4, wherein, The sieving speed of the pigment composition is 3.10 mg / (cm²). 2 · seconds) or more.

6. An ink comprising the pigment composition according to any one of claims 1 to 5.

7. A toner comprising the pigment composition according to any one of claims 1 to 5.

8. A coating comprising the pigment composition according to any one of claims 1 to 5.

9. A resin molded article comprising the pigment composition according to any one of claims 1 to 5.

10. A method for manufacturing a pigment composition, comprising at least: The mixing process involves mixing CI pigment yellow 180, a surfactant, and water to obtain a slurry of the pigment composition. as well as The heating process involves heating the slurry. The amount of surfactant added is 1.5 to 7.5 parts by weight relative to 100 parts by weight of the CI pigment yellow 180.

Images