Cleaning method

Abstract

To provide a cleaning method which can easily remove a coloring composition adhered onto a production device after production of the coloring composition.SOLUTION: A cleaning method of a production device after mixing a raw material including a coloring agent and an organic solvent in the production device having a mixing tank with a stirrer to produce a coloring composition and then discharging the coloring composition from the production device includes carrying out ultrasonic cleaning of the stirrer by using a solvent including the organic solvent.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for cleaning a production apparatus for producing a colored composition. [Background technology]

[0002] Solid-state imaging devices such as CCDs (charge-coupled devices) and CMOSs ​​(complementary metal-oxide semiconductors) are used in video cameras, digital still cameras, and mobile phones with camera functions. Furthermore, solid-state imaging devices are equipped with optical filters such as color filters. Optical filters are manufactured using coloring compositions.

[0003] The colored composition is produced by mixing raw materials containing a colorant and an organic solvent in a production apparatus having a mixing tank equipped with a stirrer. After the production of the colored composition, the production apparatus, such as the mixing tank, is washed with an organic solvent, as described in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-086222 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional cleaning methods require labor and time for cleaning the manufacturing equipment. In addition, when the manufacturing equipment has uneven parts such as screws, joints, scratches, etc. on its surface, conventional cleaning methods can be difficult to remove the coloring composition that has penetrated into these uneven parts. In particular, since agitators often have complex shapes, conventional cleaning methods can sometimes be insufficient to clean and remove the coloring composition that has adhered to the agitator.

[0006] Therefore, an object of the present invention is to provide a cleaning method capable of easily removing a colored composition adhering to a production apparatus after the production of the colored composition. [Means for solving the problem]

[0007] The present invention provides the following:

[0008] <1> A method for cleaning a production apparatus after a colored composition is produced by mixing raw materials containing a colorant and an organic solvent in a production apparatus having a mixing tank equipped with a stirrer and discharging the colored composition from the production apparatus, comprising: A cleaning method comprising ultrasonically cleaning the stirrer using a solvent containing an organic solvent. <2> The temperature of the solvent used in the ultrasonic cleaning is 15 to 50°C. <1> The cleaning method described in <3> The organic solvent contained in the solvent used in the ultrasonic cleaning contains at least one selected from N-methyl-2-pyrrolidone, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, and cyclohexanone. <1> or <2> The cleaning method described in <4> The ultrasonic cleaning is performed multiple times. <1> ~ <3> 10. The cleaning method according to claim 9, wherein the cleaning agent is a fluorine-containing compound. <5> The agitator after the ultrasonic cleaning is brought into contact with the same organic solvent as that contained in the colored composition produced using the production apparatus after the cleaning. <1> ~ <4> 10. The cleaning method according to claim 9, wherein the cleaning agent is a fluorine-containing compound. <6> In the ultrasonic cleaning, the ultrasonic frequency is 10 to 100 kHz, and the ultrasonic irradiation time is 30 to 120 minutes. <1> ~ <5> 10. The cleaning method according to claim 9, wherein the cleaning agent is a fluorine-containing compound. <7> The colorant includes a black colorant. <1> ~ <6> 10. The cleaning method according to claim 9, wherein the cleaning agent is a fluorine-containing compound. <8> The colorants include pigments and dyes. <1> ~ <7> 10. The cleaning method according to claim 9, wherein the cleaning agent is a fluorine-containing compound. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a cleaning method capable of easily removing a colored composition that has adhered to a production apparatus after the production of the colored composition. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. In this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit. In the description of groups (atomic groups) in this specification, when a notation does not specify whether they are substituted or unsubstituted, it encompasses both unsubstituted groups (atomic groups) and substituted groups (atomic groups). For example, the term "alkyl group" encompasses not only alkyl groups without a substituent (unsubstituted alkyl groups) but also alkyl groups with a substituent (substituted alkyl groups). In this specification, "(meth)acrylate" refers to either or both of acrylate and methacrylate, "(meth)acrylic" refers to either or both of acrylic and methacrylic, and "(meth)acryloyl" refers to either or both of acryloyl and methacryloyl. In this specification, the weight average molecular weight and number average molecular weight are values ​​measured by GPC (gel permeation chromatography) in terms of polystyrene. In this specification, the total solid content refers to the total mass of all components of the composition excluding the solvent. In this specification, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended effect of the process is achieved.

[0011] <Cleaning method> The cleaning method of the present invention is a method for cleaning a production apparatus after a colored composition is produced by mixing raw materials containing a colorant and an organic solvent in a production apparatus having a mixing tank equipped with a stirrer, and the colored composition is discharged from the production apparatus, The method is characterized in that the agitator is ultrasonically cleaned using a solvent containing an organic solvent.

[0012] According to the cleaning method of the present invention, by ultrasonically cleaning the agitator using a solvent containing an organic solvent, the colored composition that has adhered to the agitator during the production of the colored composition can be easily removed in a short time. Furthermore, wear and damage to the agitator can be suppressed during cleaning, thereby preventing a decrease in the life of the equipment. Furthermore, when a new colored composition is produced using the cleaned production equipment, contamination of the colored composition can be prevented, allowing for the production of colored compositions suitable for the production of optical filters, solid-state imaging devices, display devices, and the like with high yield. The cleaning method of the present invention will be described in detail below.

[0013] First, the colored composition production apparatus will be described. The production apparatus has a mixing tank equipped with a stirrer.

[0014] The capacity of the mixing tank varies depending on the production scale of the colored composition, but is preferably 1 to 2000 L, and more preferably 5 to 200 L.

[0015] It is preferable that an inlet for introducing raw materials for the coloring composition and the like is provided vertically above the mixing tank. The shape of the inlet is not particularly limited and may be any shape such as circular, elliptical, or rectangular. The inlet may also be provided with a detachable lid. A pipe may also be connected to the inlet.

[0016] A discharge port is preferably provided vertically below the mixing tank. The shape of the discharge port is not particularly limited and may be any shape such as a circle, an ellipse, or a square. A pipe may be connected to the discharge port.

[0017] The mixing tank is equipped with a stirrer, and the raw materials of the coloring composition introduced into the mixing tank are stirred in the mixing tank by the stirrer. The shape of the stirrer is not particularly limited. For example, a turbine blade shape, a paddle blade shape, an anchor blade shape, a propeller blade shape, a screw blade shape, etc. can be mentioned, and these can be appropriately selected.

[0018] The mixing vessel may be equipped with a structure that allows heating or cooling, such as a heater or a jacket through which hot water, steam, or cold water can pass.

[0019] The colored composition is produced by adding raw materials containing a colorant and an organic solvent to a mixing tank of the production apparatus and stirring the raw materials in the mixing tank with a stirrer. The colored composition will be described later.

[0020] The colored composition after production is discharged from the production apparatus, for example, from the outlet of the mixing tank.

[0021] The cleaning method of the present invention is characterized in that, after the colored composition has been discharged from the production apparatus, the agitator is ultrasonically cleaned using a solvent containing an organic solvent.

[0022] The ultrasonic cleaning can be carried out by irradiating ultrasonic waves to the solvent while the stirrer is immersed in the solvent.

[0023] The frequency of the ultrasonic waves is preferably 10 to 100 kHz, more preferably 20 to 30 kHz. The duration of ultrasonic wave irradiation is preferably 30 to 120 minutes, more preferably 45 to 90 minutes.

[0024] The solvent used in the ultrasonic cleaning preferably contains an organic solvent in an amount of 90% by mass or more, more preferably 95% by mass or more, even more preferably 99% by mass or more, and is particularly preferably made of organic solvent only.

[0025] Examples of the organic solvent include ester solvents, ketone solvents, alcohol solvents, amide solvents, ether solvents, hydrocarbon solvents, etc. Specific examples of the organic solvent include N-methyl-2-pyrrolidone, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, cyclohexanone, N,N-dimethylformamide, N,N-dimethylacetamide, 3-methoxy-N,N-dimethylpropanamide, 3-butoxy-N,N-dimethylpropanamide, cyclopentanone, ethyl acetate, butyl acetate, and cyclopentyl methyl ether, and preferably at least one selected from N-methyl-2-pyrrolidone, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, and cyclohexanone.

[0026] In addition, the solvent used in the ultrasonic cleaning may contain the same type of organic solvent as that contained in the colored composition produced using the production equipment after cleaning. According to this embodiment, it is expected that the effect of preventing the inclusion of different solvents in the subsequently produced product can be achieved. Note that, when the colored composition produced using the production equipment after cleaning contains two or more organic solvents, the colored composition containing at least one organic solvent corresponds to the colored composition containing the same type of organic solvent as that contained in the colored composition produced using the production equipment after cleaning.

[0027] The temperature of the solvent used in ultrasonic cleaning is preferably 15 to 50° C. The lower limit is preferably 18° C. or higher, and more preferably 20° C. or higher. The upper limit is preferably 45° C. or lower, and more preferably 40° C. or lower.

[0028] The ultrasonic cleaning may be performed only once or multiple times. When ultrasonic cleaning is performed multiple times, the same solvent may be used in each step, or different solvents may be used. It is preferable to perform ultrasonic cleaning using different solvents because this can further enhance the cleaning effect. Furthermore, when ultrasonic cleaning is performed using different solvents, it is preferable that the final ultrasonic cleaning is performed using a solvent containing the same type of organic solvent as that contained in the colored composition produced using the production equipment after cleaning (preferably, the same type of organic solvent as that contained in the colored composition produced using the production equipment after cleaning).

[0029] In the cleaning method of the present invention, the agitator is ultrasonically cleaned using a solvent containing an organic solvent, but the agitator may also be subjected to cleaning other than ultrasonic cleaning. Cleaning other than ultrasonic cleaning may be performed before or after the ultrasonic cleaning. Examples of cleaning methods other than ultrasonic cleaning include a method of cleaning by spraying a solvent containing an organic solvent from a nozzle, a method of cleaning using a brush, and a method of wiping using a rag.

[0030] In the cleaning method of the present invention, it is preferable to contact the agitator after the ultrasonic cleaning with the same type of organic solvent as that contained in the colored composition produced using the production apparatus after the cleaning. According to this embodiment, it is expected that the effect of preventing the contamination of subsequent products with a different solvent can be achieved. The method of contacting the agitator after the ultrasonic cleaning with the organic solvent can be performed by immersing the agitator in the organic solvent, or by spraying or atomizing the organic solvent onto the agitator. Alternatively, the agitator may be immersed in a mixing tank filled with the organic solvent, and at this time, the agitator may be driven to agitate the organic solvent in the mixing tank.

[0031] The mixing tank can be cleaned using an organic solvent. Cleaning methods include ultrasonic cleaning, a method of cleaning by spraying a solvent containing an organic solvent from a nozzle, a method of cleaning using a brush or the like, a method of repeatedly stirring and discharging a solvent after adding it, and a method of wiping it with a rag or the like. A combination of these cleaning methods may also be used. When ultrasonically cleaning the mixing tank, the mixing tank may be filled with a solvent and ultrasonic waves may be irradiated onto the solvent filled in the mixing tank, or the mixing tank may be immersed in the solvent and ultrasonic waves may be irradiated onto the solvent. The preferred conditions for ultrasonic cleaning and the solvent to be used are the same as those described above.

[0032] It is preferable to bring the washed mixing tank into contact with the same type of organic solvent as that contained in the colored composition produced using the washed production apparatus. The method for bringing the washed mixing tank into contact with the organic solvent can be a method of immersing the mixing tank in the organic solvent, or a method of spraying or atomizing the organic solvent into the mixing tank. Alternatively, a stirrer may be immersed in the mixing tank filled with the organic solvent, and the stirrer may be driven to stir the organic solvent in the mixing tank.

[0033] When the coloring composition production apparatus further includes components other than the agitator and the mixing tank (for example, piping, nozzles, valves, etc.), these components can also be washed with an organic solvent. Examples of the washing method include ultrasonic washing, a method of washing by spraying a solvent containing an organic solvent from a nozzle, a method of washing with a brush, etc., a method of disassembling the above components and then immersing them in a solvent, and a method of wiping them with a rag, etc. A combination of these washing methods may also be used.

[0034] It is preferable to bring the washed member into contact with the same kind of organic solvent as that contained in the coloring composition produced using the washed production apparatus. The method for bringing the washed member into contact with the organic solvent can be a method of immersing the member in the organic solvent, or a method of spraying or spraying the organic solvent onto the member.

[0035] The production equipment thus cleaned can be used to produce a new colored composition.

[0036] <Coloring composition> Next, the coloring composition will be described.

[0037] <<Coloring agent>> The coloring composition contains a colorant. Examples of colorants include chromatic colorants and black colorants. The effects of the present invention are particularly pronounced when a colorant containing a black colorant is used. The colorant may be a pigment or a dye. A pigment and a dye may be used in combination. The pigment may be either an inorganic pigment or an organic pigment. Furthermore, the pigment may be a material in which a portion of an inorganic pigment or an organic-inorganic pigment is substituted with an organic chromophore.

[0038] When a pigment-containing colorant is used, conventional cleaning methods require laborious and time-consuming cleaning. However, the cleaning method of the present invention can easily remove the colorant adhering to the stirrer after production of the colorant, even when a pigment-containing colorant is used. Therefore, the cleaning method of the present invention is particularly effective when a pigment-containing colorant is used. The content of the pigment in the colorant is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and particularly preferably 90% by mass or more. Furthermore, it is also preferable that the colorant contains a pigment and a dye.

[0039] The average primary particle diameter of the pigment is preferably 1 to 200 nm. The lower limit is preferably 5 nm or more, more preferably 10 nm or more. The upper limit is preferably 180 nm or less, more preferably 150 nm or less, and even more preferably 100 nm or less. If the surface of a stirrer is uneven, such as with screws, joints, or scratches, the smaller the average primary particle diameter of the pigment, the more easily it penetrates into these uneven surfaces. For this reason, in conventional cleaning methods, the smaller the average primary particle diameter of the pigment, the more time and effort it takes to clean and remove the coloring composition. The cleaning method of the present invention can easily remove coloring composition adhering to a stirrer after production of a coloring composition, even if the average primary particle diameter of the pigment is small. Therefore, this method is particularly effective when a colorant containing a pigment with a small average primary particle diameter is used. Note that, in this specification, the primary particle diameter of the pigment can be determined from an image obtained by observing the primary particles of the pigment with a transmission electron microscope. Specifically, the projected area of ​​the pigment primary particles is determined, and the corresponding circle-equivalent diameter is calculated as the primary particle diameter of the pigment. In this specification, the average primary particle size is the arithmetic mean value of the primary particle sizes of 400 primary particles of the pigment. The primary particles of the pigment refer to independent particles that are not aggregated.

[0040] (chromatic colorants) Examples of chromatic colorants include colorants having a maximum absorption wavelength in the wavelength range of 400 to 700 nm. Examples include red colorants, green colorants, blue colorants, yellow colorants, purple colorants, orange colorants, etc. Specific examples of chromatic colorants include the following:

[0041] Color Index (CI) Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 24, 31, 32, 34, 35, 35:1, 36, 36:1, 37, 37:1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, Yellow pigments such as 126, 127, 128, 129, 137, 138, 139, 147, 148, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, 182, 185, 187, 188, 193, 194, 199, 213, 214, 215, 228, 231, 232, 233, 234, 235, 236. Orange pigments such as CI Pigment Orange 2, 5, 13, 16, 17:1, 31, 34, 36, 38, 43, 46, 48, 49, 51, 52, 55, 59, 60, 61, 62, 64, 71, and 73. CIPigment Red 1,2,3,4,5,6,7,9,10,14,17,22,23,31,38,41,48:1,48:2,48:3,48:4,49,49:1,49:2,52:1,52:2,53 :1,57:1,60:1,63:1,66,67,81:1,81:2,81:3,83,88,90,105,112,119,122,123,144,146,149,150,15 Red pigments such as 5,166,168,169,170,171,172,175,176,177,178,179,184,185,187,188,190,200,202,206,207,208,209,210,216,220,224,226,242,246,254,255,264,269,270,272,279,291,294,295,296,297. Green pigments such as CI Pigment Green 7, 10, 36, 37, 58, 59, 62, 63, 64, 65, and 66. Purple pigments such as CI Pigment Violet 1, 19, 23, 27, 32, 37, 42, 60, and 61. Blue pigments such as CI Pigment Blue 1, 2, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 22, 29, 60, 64, 66, 79, 80, 87, and 88.

[0042] Alternatively, the green colorant may be a halogenated zinc phthalocyanine pigment having an average of 10 to 14 halogen atoms, an average of 8 to 12 bromine atoms, and an average of 2 to 5 chlorine atoms per molecule. Specific examples include the compounds described in WO 2015 / 118720. In addition, as a green colorant, compounds described in Chinese Patent Application No. 106909027, phthalocyanine compounds having a phosphate ester as a ligand described in WO 2012 / 102395, phthalocyanine compounds described in JP 2019-008014 A, phthalocyanine compounds described in JP 2018-180023 A, compounds described in JP 2019-038958 A, aluminum phthalocyanine compounds described in JP 2020-070426 A, core-shell dyes described in JP 2020-076995 A, green pigments described in WO 2020 / 045199, and the like can also be used.

[0043] Furthermore, an aluminum phthalocyanine compound having a phosphorus atom can also be used as the blue colorant. Specific examples include the compounds described in paragraphs 0022 to 0030 of JP-A No. 2012-247591 and paragraph 0047 of JP-A No. 2011-157478.

[0044] Furthermore, as the yellow colorant, an azobarbituric acid nickel complex having the following structure can also be used. [ka]

[0045] Further, as the yellow colorant, compounds described in JP-A-2017-201003, compounds described in JP-A-2017-197719, compounds described in paragraphs 0011 to 0062 and 0137 to 0276 of JP-A-2017-171912, compounds described in paragraphs 0010 to 0062 and 0138 to 0295 of JP-A-2017-171913, compounds described in paragraphs 0011 to 0062 and 0139 to 0190 of JP-A-2017-171914, compounds described in paragraphs 0010 to 0065 and 0142 to 0222 of JP-A-2017-171915, compounds described in JP 2013-054339 A, paragraphs 0011 to 0034; quinophthalone compounds described in JP 2014-026228 A, paragraphs 0013 to 0058; isoindoline compounds described in JP 2018-062644 A; quinophthalone compounds described in JP 2018-203798 A; quinophthalone compounds described in JP 2018-062578 A; quinophthalone compounds described in Japanese Patent No. 6432076; quinophthalone compounds described in JP 2018-155881 A; 57, quinophthalone compounds described in JP 2018-040835 A, quinophthalone compounds described in JP 2017-197640 A, quinophthalone compounds described in JP 2016-145282 A, quinophthalone compounds described in JP 2014-085565 A, quinophthalone compounds described in JP 2014-021139 A, quinophthalone compounds described in JP 2013-209614 A, quinophthalone compounds described in JP 2013-209435 A, quinophthalone compounds described in JP 2013-181015 A Quinophthalone compounds, quinophthalone compounds described in JP 2013-061622 A, quinophthalone compounds described in JP 2013-032486 A, quinophthalone compounds described in JP 2012-226110 A, quinophthalone compounds described in JP 2008-074987 A, quinophthalone compounds described in JP 2008-081565 A, quinophthalone compounds described in JP 2008-074986 A, quinophthalone compounds described in JP 2008-074985 A, quinophthalone compounds described in JP 2008-050420 A,Quinophthalone compounds described in JP 2008-031281 A, quinophthalone compounds described in JP 48-032765 A, quinophthalone compounds described in JP 2019-008014 A, quinophthalone compounds described in Japanese Patent No. 6607427 A, methine dyes described in JP 2019-073695 A, methine dyes described in JP 2019-073696 A, methine dyes described in JP 2019-073697 A, methine dyes described in JP 2019-073698 A, compounds described in Korean Patent Publication No. 10-2014-0034963, compounds described in JP 2017-095706 A, compounds described in Taiwan Patent Application Publication No. 201920495 A, Patent Compounds described in JP-A-6607427, compounds described in JP-A-2020-033525, compounds described in JP-A-2020-033524, compounds described in JP-A-2020-033523, compounds described in JP-A-2020-033522, compounds described in JP-A-2020-033521, compounds described in WO 2020 / 045200, compounds described in WO 2020 / 045199, compounds described in WO 2020 / 045197, azo compounds described in JP-A-2020-093994, perylene compounds described in WO 2020 / 105346, and quinophthalone compounds described in JP-T-2020-517791 can also be used. Furthermore, polymerized versions of these compounds are also preferably used from the viewpoint of improving color value.

[0046] As red colorants, diketopyrrolopyrrole compounds substituted with at least one bromine atom in the structure described in JP 2017-201384 A, diketopyrrolopyrrole compounds described in paragraphs 0016 to 0022 of Japanese Patent No. 6248838, diketopyrrolopyrrole compounds described in WO 2012 / 102399, diketopyrrolopyrrole compounds described in WO 2012 / 117965, brominated diketopyrrolopyrrole compounds described in JP 2020-085947 A, naphthol azo compounds described in JP 2012-229344 A, red colorants described in Japanese Patent No. 6516119, Japanese Patent No. 6525101 A The red colorant described in JP 2020-090632 A, the brominated diketopyrrolopyrrole compound described in paragraph number 0229, the anthraquinone compound described in Korean Patent Publication No. 10-2019-0140741, the anthraquinone compound described in Korean Patent Publication No. 10-2019-0140744, the perylene compound described in JP 2020-079396 A, the perylene compound described in JP 2020-083982 A, the xanthene compound described in JP 2018-035345 A, the diketopyrrolopyrrole compound described in paragraph numbers 0025 to 0041 of JP 2020-066702, and the like can also be used. Furthermore, as the red colorant, a compound having a structure in which an aromatic ring group, in which a group in which an oxygen atom, a sulfur atom, or a nitrogen atom is bonded to the aromatic ring, is bonded to a diketopyrrolopyrrole skeleton, can also be used.

[0047] Dyes can also be used as the chromatic colorant. There are no particular limitations on the dyes, and known dyes can be used. Examples include pyrazole azo dyes, anilino azo dyes, triarylmethane dyes, anthraquinone dyes, anthrapyridone dyes, benzylidene dyes, oxonol dyes, pyrazolotriazole azo dyes, pyridone azo dyes, cyanine dyes, phenothiazine dyes, pyrrolopyrazole azomethine dyes, xanthene dyes, phthalocyanine dyes, benzopyran dyes, indigo dyes, and pyrromethene dyes.

[0048] A dye multimer can also be used as a chromatic colorant. The dye multimer is preferably a dye dissolved in a solvent before use. The dye multimer may also form particles. When the dye multimer is particulate, it is usually used in a state dispersed in a solvent. A particulate dye multimer can be obtained, for example, by emulsion polymerization, and specific examples of the compounds and production methods described in JP-A No. 2015-214682 include those having two or more dye structures in one molecule, and preferably having three or more dye structures. The upper limit is not particularly limited, but can be 100 or less. The multiple dye structures in one molecule may be the same dye structure or different dye structures. The weight-average molecular weight (Mw) of the dye multimer is preferably 2,000 to 50,000. The lower limit is more preferably 3,000 or more, and even more preferably 6,000 or more. The upper limit is more preferably 30,000 or less, and even more preferably 20,000 or less. As the dye multimer, compounds described in JP-A Nos. 2011-213925, 2013-041097, 2015-028144, 2015-030742, WO 2016 / 031442, etc. can also be used.

[0049] Examples of chromatic colorants that can be used include diarylmethane compounds described in JP-A-2020-504758, triarylmethane dye polymers described in Korean Patent Publication No. 10-2020-0028160, xanthene compounds described in JP-A-2020-117638, phthalocyanine compounds described in WO 2020 / 174991, and isoindoline compounds or salts thereof described in JP-A-2020-160279.

[0050] Two or more chromatic colorants may be used in combination. When two or more chromatic colorants are used in combination, the combination of two or more chromatic colorants may form a black color.

[0051] (black colorant) The black colorant is not particularly limited, and known black colorants can be used. For example, inorganic black colorants include carbon black, titanium black, graphite, etc., with carbon black and titanium black being preferred, and titanium black being more preferred. Titanium black is a black particle containing titanium atoms, and low-order titanium oxide or titanium oxynitride is preferred. Titanium black can be surface-modified as needed to improve dispersibility, suppress aggregation, etc. For example, the surface of titanium black can be coated with silicon oxide, titanium oxide, germanium oxide, aluminum oxide, magnesium oxide, or zirconium oxide. Treatment with a water-repellent substance such as that described in JP 2007-302836 A can also be used. Color Index (CI) Pigment Black 1,7 can also be used as a black colorant. It is preferable that titanium black have small individual particle sizes and small average primary particle sizes. Specifically, the average primary particle size is preferably 10 to 45 nm. Titanium black can also be used as a dispersion. For example, a dispersion containing titanium black particles and silica particles, with the Si atom to Ti atom ratio adjusted to a range of 0.20 to 0.50, can be used. Regarding the dispersion, see paragraphs 0020 to 0105 of JP 2012-169556 A, the contents of which are incorporated herein by reference. Examples of commercially available titanium black products include Titanium Black 10S, 12S, 13R, 13M, 13M-C, 13R-N, and 13M-T (trade names: Mitsubishi Materials Corporation) and Tilack D (trade name: Ako Kasei Co., Ltd.). Examples of organic black colorants include bisbenzofuranone compounds, azomethine compounds, perylene compounds, and azo compounds, with bisbenzofuranone compounds and perylene compounds being preferred. Examples of the bisbenzofuranone compound include compounds described in JP-T-2010-534726, JP-T-2012-515233, JP-T-2012-515234, WO 2014 / 208348, and JP-T-2015-525260, and are available as "Irgaphor Black" manufactured by BASF, for example.Examples of perylene compounds include CI Pigment Black 31 and 32. Examples of azomethine compounds include compounds described in JP-A-01-170601 and JP-A-02-034664, and are available, for example, as "Chromofine Black A1103" manufactured by Dainichiseika Color & Chemicals Co., Ltd. In addition, perylene black (such as Lumogen Black FK4280) described in paragraphs 0016 to 0020 of JP-A-2017-226821 may also be used as an organic black colorant.

[0052] The content of the colorant in the total solid content of the colored composition is preferably 10 to 90% by mass. The lower limit is preferably 15% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass or more. The upper limit is preferably 80% by mass or less, and more preferably 70% by mass or less. The content of the pigment in the total solid content of the coloring composition is preferably 10 to 90% by mass. The lower limit is preferably 15% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass or more. The upper limit is preferably 80% by mass or less, and more preferably 70% by mass or less. The content of the dye in the colorant is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less. The colorant may be used alone or in combination of two or more kinds. When two or more kinds are used in combination, the total amount thereof is preferably in the above range.

[0053] <<Organic solvents>> The coloring composition contains an organic solvent. Examples of the organic solvent include ester solvents, ketone solvents, alcohol solvents, amide solvents, ether solvents, and hydrocarbon solvents. For details, see paragraph 0223 of International Publication No. 2015 / 166779, the contents of which are incorporated herein by reference. In addition, ester solvents substituted with a cyclic alkyl group and ketone solvents substituted with a cyclic alkyl group can also be preferably used. Specific examples of organic solvents include polyethylene glycol monomethyl ether, dichloromethane, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl cellosolve acetate, ethyl lactate, diethylene glycol dimethyl ether, butyl acetate, methyl 3-methoxypropionate, 2-heptanone, 3-pentanone, 4-heptanone, cyclohexanone, 2-methylcyclohexanone, 3-methylcyclohexanone, 4-methylcyclohexanone, cycloheptanone, cyclooctanone, cyclohexyl acetate, cyclopentanone, ethyl carbitol acetate, and butyl methacrylate. Examples of suitable organic solvents include ethyl carbitol acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, 3-methoxy-N,N-dimethylpropanamide, 3-butoxy-N,N-dimethylpropanamide, propylene glycol diacetate, 3-methoxybutanol, methyl ethyl ketone, gamma butyrolactone, sulfolane, anisole, 1,4-diacetoxybutane, diethylene glycol monoethyl ether acetate, butane-1,3-diyl diacetate, dipropylene glycol methyl ether acetate, and diacetone alcohol. However, aromatic hydrocarbons (benzene, toluene, xylene, ethylbenzene, etc.) used as organic solvents may be reduced for environmental reasons (for example, the concentration of the organic solvent may be reduced to 50 ppm (parts per million) by mass or less, 10 ppm by mass or less, or 1 ppm by mass or less).

[0054] The content of the organic solvent in the coloring composition is preferably 60 to 95% by mass. The lower limit is preferably 70% by mass or more, more preferably 75% by mass or more, and even more preferably 80% by mass or more. The upper limit is preferably 92.5% by mass or less, and more preferably 90% by mass or less.

[0055] <<Raw materials other than colorants and organic solvents>> (polymerizable monomer) The coloring composition may contain a polymerizable monomer. Examples of the polymerizable monomer include a compound having an ethylenically unsaturated bond-containing group. Examples of the ethylenically unsaturated bond-containing group include a vinyl group, a (meth)allyl group, and a (meth)acryloyl group. The polymerizable monomer is preferably a radically polymerizable monomer.

[0056] The molecular weight of the polymerizable monomer is preferably 100 to 3000. The upper limit is more preferably 2000 or less, and even more preferably 1500 or less. The lower limit is more preferably 150 or more, and even more preferably 250 or more.

[0057] The polymerizable monomer is preferably a compound containing 3 or more ethylenically unsaturated bond-containing groups, more preferably a compound containing 3 to 15 ethylenically unsaturated bond-containing groups, and even more preferably a compound containing 3 to 6 ethylenically unsaturated bond-containing groups. The polymerizable monomer is preferably a 3- to 15-functional (meth)acrylate compound, and more preferably a 3- to 6-functional (meth)acrylate compound. Specific examples of the polymerizable monomer include those described in paragraphs 0095 to 0108 of JP-A-2009-288705, 0227 of JP-A-2013-029760, 0254 to 0257 of JP-A-2008-292970, 0034 to 0038 of JP-A-2013-253224, 0477 of JP-A-2012-208494, JP-A-2017-048367, JP-A-6057891, JP-A-6031807, and JP-A-2017-194662, the contents of which are incorporated herein by reference.

[0058] Preferred polymerizable monomers include dipentaerythritol triacrylate (commercially available KAYARAD D-330, manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol tetraacrylate (commercially available KAYARAD D-320, manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol penta(meth)acrylate (commercially available KAYARAD D-310, manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol hexa(meth)acrylate (commercially available KAYARAD DPHA, manufactured by Nippon Kayaku Co., Ltd., and NK Ester A-DPH-12E, manufactured by Shin-Nakamura Chemical Co., Ltd.), and compounds in which the (meth)acryloyl groups are bonded via ethylene glycol and / or propylene glycol residues (e.g., SR454 and SR499, commercially available from Sartomer). Furthermore, examples of polymerizable monomers that can be used include diglycerin EO (ethylene oxide)-modified (meth)acrylate (commercially available product M-460; manufactured by Toagosei Co., Ltd.), pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester A-TMMT), 1,6-hexanediol diacrylate (manufactured by Nippon Kayaku Co., Ltd., KAYARAD HDDA), RP-1040 (manufactured by Nippon Kayaku Co., Ltd.), Aronix TO-2349 (manufactured by Toagosei Co., Ltd.), NK Oligo UA-7200 (manufactured by Shin-Nakamura Chemical Co., Ltd.), 8UH-1006, 8UH-1012 (manufactured by Taisei Fine Chemical Co., Ltd.), and Light Acrylate POB-A0 (manufactured by Kyoeisha Chemical Co., Ltd.).

[0059] As the polymerizable monomer, trifunctional (meth)acrylate compounds such as trimethylolpropane tri(meth)acrylate, trimethylolpropane propyleneoxy-modified tri(meth)acrylate, trimethylolpropane ethyleneoxy-modified tri(meth)acrylate, isocyanuric acid ethyleneoxy-modified tri(meth)acrylate, and pentaerythritol tri(meth)acrylate can also be used. Commercially available trifunctional (meth)acrylate compounds include Aronix M-309, M-310, M-321, M-350, M-360, M-313, M-315, M-306, M-305, M-303, M-452, and M-450 (manufactured by Toagosei Co., Ltd.), NK Ester A9300, A-GLY-9E, A-GLY-20E, A-TMM-3, A-TMM-3L, A-TMM-3LM-N, A-TMPT, and TMPT (manufactured by Shin-Nakamura Chemical Co., Ltd.), and KAYARAD GPO-303, TMPTA, THE-330, TPA-330, and PET-30 (manufactured by Nippon Kayaku Co., Ltd.).

[0060] As the polymerizable monomer, a polymerizable monomer having an acid group can also be used. Examples of the acid group include a carboxyl group, a sulfo group, and a phosphate group, with a carboxyl group being preferred. Commercially available polymerizable monomers having an acid group include Aronix M-305, M-510, M-520, and Aronix TO-2349 (manufactured by Toagosei Co., Ltd.). The acid value of the polymerizable monomer having an acid group is preferably 0.1 to 40 mgKOH / g, and more preferably 5 to 30 mgKOH / g.

[0061] As the polymerizable monomer, a polymerizable monomer having a caprolactone structure can also be used. Polymerizable monomers having a caprolactone structure are commercially available, for example, as the KAYARAD DPCA series from Nippon Kayaku Co., Ltd., and examples thereof include DPCA-20, DPCA-30, DPCA-60, and DPCA-120.

[0062] As the polymerizable monomer, a polymerizable monomer having an alkyleneoxy group can also be used. The polymerizable monomer having an alkyleneoxy group is preferably a polymerizable monomer having an ethyleneoxy group and / or a propyleneoxy group, more preferably a polymerizable monomer having an ethyleneoxy group, and even more preferably a tri- to hexa-functional (meth)acrylate compound having 4 to 20 ethyleneoxy groups. Examples of commercially available polymerizable monomers having an alkyleneoxy group include SR-494, a tetrafunctional (meth)acrylate having four ethyleneoxy groups manufactured by Sartomer, and KAYARAD TPA-330, a trifunctional (meth)acrylate having three isobutyleneoxy groups manufactured by Nippon Kayaku Co., Ltd.

[0063] As the polymerizable monomer, a polymerizable monomer having a fluorene skeleton can also be used. Commercially available polymerizable monomers having a fluorene skeleton include OGSOL EA-0200 and EA-0300 (manufactured by Osaka Gas Chemicals Co., Ltd., (meth)acrylate monomers having a fluorene skeleton).

[0064] As the polymerizable monomer, a compound that is substantially free of environmentally restricted substances such as toluene can also be used. Commercially available products of such compounds include KAYARAD DPHA LT and KAYARAD DPEA-12 LT (manufactured by Nippon Kayaku Co., Ltd.).

[0065] The content of the polymerizable monomer in the total solid content of the colored composition is preferably 0.1 to 40% by mass. The lower limit is preferably 0.5% by mass or more, more preferably 1% by mass or more. The upper limit is preferably 30% by mass or less, more preferably 20% by mass or less.

[0066] (Photopolymerization initiator) The coloring composition may contain a photopolymerization initiator. The photopolymerization initiator is not particularly limited and can be appropriately selected from known photopolymerization initiators. For example, a compound having photosensitivity to light in the ultraviolet to visible light range is preferred. The photopolymerization initiator is preferably a photoradical polymerization initiator.

[0067] Examples of the photopolymerization initiator include halogenated hydrocarbon derivatives (e.g., compounds having a triazine skeleton, compounds having an oxadiazole skeleton, etc.), acylphosphine compounds, hexaarylbiimidazole compounds, oxime compounds, organic peroxides, thio compounds, ketone compounds, aromatic onium salts, α-hydroxyketone compounds, α-aminoketone compounds, etc. From the viewpoint of exposure sensitivity, the photopolymerization initiator is preferably a trihalomethyltriazine compound, benzyl dimethyl ketal compound, α-hydroxyketone compound, α-aminoketone compound, acylphosphine compound, phosphine oxide compound, metallocene compound, oxime compound, hexaarylbiimidazole compound, onium compound, benzothiazole compound, benzophenone compound, acetophenone compound, cyclopentadiene-benzene-iron complex, halomethyloxadiazole compound, or 3-aryl-substituted coumarin compound, more preferably a compound selected from oxime compounds, α-hydroxyketone compounds, α-aminoketone compounds, and acylphosphine compounds, and even more preferably an oxime compound. In addition, examples of the photopolymerization initiator include the compounds described in paragraphs 0065 to 0111 of JP-A No. 2014-130173, the compounds described in Japanese Patent No. 6301489, and the MATERIAL STAGE 37 to 60pp, vol. 19, No. 3, 2019, peroxide-based photopolymerization initiators described, photopolymerization initiators described in WO 2018 / 221177, photopolymerization initiators described in WO 2018 / 110179, photopolymerization initiators described in JP 2019-043864 A, photopolymerization initiators described in JP 2019-044030 A, peroxide-based initiators described in JP 2019-167313 A, aminoacetophenone-based initiators having an oxazolidine group described in JP 2020-055992 A, oxime-based photopolymerization initiators described in JP 2013-190459 A, polymers described in JP 2020-172619 A, and the like, the contents of which are incorporated herein by reference.

[0068] Commercially available α-hydroxyketone compounds include Omnirad 184, Omnirad 1173, Omnirad 2959, Omnirad 127 (manufactured by IGM Resins BV), Irgacure 184, Irgacure 1173, Irgacure 2959, Irgacure 127 (manufactured by BASF), etc. Commercially available α-aminoketone compounds include Omnirad 907, Omnirad 369, Omnirad 369E, Omnirad 379EG (manufactured by IGM Resins BV), Irgacure 907, Irgacure 369, Irgacure 369E, Irgacure 379EG (manufactured by BASF), etc. Commercially available acylphosphine compounds include Omnirad 819 and Omnirad TPO (both manufactured by IGM Resins BV), Irgacure 819 and Irgacure TPO (both manufactured by BASF).

[0069] Examples of the oxime compound include compounds described in JP-A-2001-233842, compounds described in JP-A-2000-080068, compounds described in JP-A-2006-342166, compounds described in J.C.S. Perkin II (1979, pp. 1653-1660), compounds described in J.C.S. Perkin II (1979, pp. 156-162), compounds described in Journal of Photopolymer Science and Compounds described in Technology (1995, pp. 202-232), compounds described in JP 2000-066385 A, compounds described in JP 2004-534797 A, compounds described in JP 2006-342166 A, compounds described in JP 2017-019766 A, compounds described in Japanese Patent No. 6065596 A, compounds described in WO 2015 / 152153 A compounds described in WO 2017 / 051680, compounds described in JP 2017-198865 A, compounds described in paragraphs 0025 to 0038 of WO 2017 / 164127 A, compounds described in WO 2013 / 167515 A, compounds described in JP 2014-137466 A, compounds described in Japanese Patent No. 6636081 A, Korean Patent Publication No. 10-2016 compounds described in Japanese Patent Application Laid-Open No. 2013-0109444, compounds described in International Publication No. 2013 / 083505, compounds described in paragraphs 0031 to 0047 of JP-A No. 2013-114249, compounds described in paragraphs 0008 to 0012 and 0070 to 0079 of JP-A No. 2014-137466, compounds described in paragraphs 0007 to 0025 of Japanese Patent Application Laid-Open No. 2010-2620 28, compounds 24, 36 to 40 described in JP-A-2014-500852, compound (C-3) described in JP-A-2013-164471, compounds OE-01 to OE-75 described in WO-A-2015 / 036910, compounds described in WO-A-2019 / 088055, and compounds described in paragraphs 0083 to 0105 of Japanese Patent No. 4600600.Specific examples of the oxime compound include 3-benzoyloxyiminobutan-2-one, 3-acetoxyiminobutan-2-one, 3-propionyloxyiminobutan-2-one, 2-acetoxyiminopentan-3-one, 2-acetoxyimino-1-phenylpropan-1-one, 2-benzoyloxyimino-1-phenylpropan-1-one, 3-(4-toluenesulfonyloxy)iminobutan-2-one, 2-ethoxycarbonyloxyimino-1-phenylpropan-1-one, 1-[4-(phenylthio)phenyl]-3-cyclohexyl-propane-1,2-dione-2-(O-acetyloxime), and the like. Commercially available products include Irgacure OXE01, Irgacure OXE02, Irgacure OXE03, Irgacure OXE04 (all manufactured by BASF), TR-PBG-304, TR-PBG-327 (manufactured by Tronley), ADEKA OPTOMER N-1919 (manufactured by ADEKA Corporation; photopolymerization initiator 2 described in JP 2012-014052 A), ADEKA ARCLES NCI-730, NCI-831, NCI-930 (all manufactured by ADEKA Corporation), and the like.

[0070] As the photopolymerization initiator, a bifunctional or trifunctional or higher functional photoradical polymerization initiator may be used. By using such a photoradical polymerization initiator, two or more radicals are generated from one molecule of the photoradical polymerization initiator, thereby obtaining good sensitivity. Furthermore, when a compound with an asymmetric structure is used, crystallinity is reduced and solubility in solvents is improved, making it less likely to precipitate over time, and improving the stability of the coloring composition over time. Specific examples of bifunctional or trifunctional or higher functional photoradical polymerization initiators include dimers of oxime compounds described in JP-A-2010-527339, JP-A-2011-524436, WO-A-2015 / 004565, WO-A-2016-532675, paragraphs 0407 to 0412, and WO-A-2017 / 033680, paragraphs 0039 to 0055; compounds (E) and (G) described in JP-A-2013-522445; Examples of such initiators include Cmpd1 to 7 described in JP 2016 / 034963 A, the oxime ester photoinitiators described in paragraph 0007 of JP 2017-523465 A, the photoinitiators described in paragraphs 0020 to 0033 of JP 2017-167399 A, the photopolymerization initiator (A) described in paragraphs 0017 to 0026 of JP 2017-151342 A, and the oxime ester photoinitiators described in Japanese Patent No. 6469669 A.

[0071] The content of the photopolymerization initiator in the total solid content of the coloring composition is preferably 0.1 to 30% by mass. The lower limit is preferably 0.5% by mass or more, and more preferably 1% by mass or more. The upper limit is preferably 20% by mass or less, and more preferably 15% by mass or less. Only one type of photopolymerization initiator may be used, or two or more types may be used. When two or more types are used, the total amount thereof preferably falls within the above range.

[0072] (resin) The coloring composition may contain a resin. The resin is blended, for example, to disperse pigments or the like in the coloring composition or as a binder. A resin used primarily to disperse pigments is also called a dispersant. However, these uses of the resin are merely examples, and the resin may also be used for purposes other than these uses.

[0073] A coloring composition containing a resin is likely to adhere to a stirrer or the like during production, and conventional cleaning methods require time and effort to clean and remove the coloring composition adhered to a stirrer or the like. However, with the cleaning method of the present invention, even when a coloring composition containing a resin is produced, the coloring composition adhered to a stirrer after production of the coloring composition can be easily removed.

[0074] The weight average molecular weight (Mw) of the resin is preferably 3,000 to 2,000,000. The upper limit is preferably 1,000,000 or less, more preferably 500,000 or less. The lower limit is preferably 4,000 or more, more preferably 5,000 or more.

[0075] Examples of the resin include (meth)acrylic resin, epoxy resin, (meth)acrylamide resin, ene-thiol resin, polycarbonate resin, polyether resin, polyarylate resin, polysulfone resin, polyethersulfone resin, polyphenylene resin, polyarylene ether phosphine oxide resin, polyimide resin, polyamideimide resin, polyolefin resin, cyclic olefin resin, polyester resin, styrene resin, and siloxane resin. In addition, the resins described in paragraphs 0041 to 0060 of JP-A-2017-206689, the resins described in paragraphs 0022 to 0071 of JP-A-2018-010856, the resins described in JP-A-2017-057265, the resins described in JP-A-2017-032685, the resins described in JP-A-2017-075248, the resins described in JP-A-2017-066240, the resins described in JP-A-2017-173787, and the blocked polyisocyanate resins described in JP-A-2016-222891 can also be used.

[0076] It is preferable to use a resin having an acid group as the resin. Examples of the acid group include a carboxyl group, a phosphate group, a sulfo group, and a phenolic hydroxy group, with a carboxyl group being preferred. The resin having an acid group can be used, for example, as an alkali-soluble resin. The acid value of the resin having an acid group is preferably 30 to 500 mgKOH / g. The lower limit is preferably 50 mgKOH / g or more, more preferably 70 mgKOH / g or more. The upper limit is preferably 400 mgKOH / g or less, more preferably 200 mgKOH / g or less, even more preferably 150 mgKOH / g or less, and most preferably 120 mgKOH / g or less.

[0077] For resins having acid groups, please refer to paragraphs

[0558] to

[0571] of JP 2012-208494 A (corresponding to paragraphs

[0685] to

[0700] of U.S. Patent Application Publication No. 2012 / 0235099 A) and paragraphs

[0076] to

[0099] of JP 2012-198408 A, the contents of which are incorporated herein by reference. Commercially available resins having acid groups can also be used. There are no particular limitations on the method for introducing acid groups into the resin, and examples include the method described in Japanese Patent No. 6,349,629 A. Another method for introducing acid groups into the resin includes reacting an acid anhydride with a hydroxy group generated by a ring-opening reaction of an epoxy group to introduce the acid group.

[0078] A resin having a basic group can also be used as the resin. The resin having a basic group is preferably a resin containing a repeating unit having a basic group in a side chain, more preferably a copolymer having a repeating unit having a basic group in a side chain and a repeating unit not having a basic group, and even more preferably a block copolymer having a repeating unit having a basic group in a side chain and a repeating unit not having a basic group. The resin having a basic group can also be used as a dispersant. The amine value of the resin having a basic group is preferably 5 to 300 mgKOH / g. The lower limit is preferably 10 mgKOH / g or more, more preferably 20 mgKOH / g or more. The upper limit is preferably 200 mgKOH / g or less, more preferably 100 mgKOH / g or less. Examples of resins having basic groups include the block copolymer (B) described in paragraphs 0063 to 0112 of JP 2014-219665 A and the block copolymer A1 described in paragraphs 0046 to 0076 of JP 2018-156021 A. Commercially available resins having basic groups include DISPERBYK-161, 162, 163, 164, 166, 167, 168, 174, 182, 183, 184, 185, 2000, 2001, 2050, 2150, 2163, 2164, BYK-LPN6919, and BYK-LPN21116 (all manufactured by BYK-Chemie), and SOLS Examples of such acrylic resins include PERSE 11200, 13240, 13650, 13940, 24000, 26000, 28000, 32000, 32500, 32550, 32600, 33000, 34750, 35100, 35200, 37500, 38500, 39000, 53095, 56000, and 7100 (all manufactured by Lubrizol Japan), and Efka PX 4300, 4330, 4046, 4060, and 4080 (all manufactured by BASF).

[0079] As the resin, a resin containing a repeating unit derived from a compound represented by the following formula (ED1) and / or a compound represented by the following formula (ED2) (hereinafter, these compounds may be referred to as "ether dimers") can also be used.

[0080] [ka]

[0081] In formula (ED1), R 1 and R 2 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms which may have a substituent. [ka] In formula (ED2), R represents a hydrogen atom or an organic group having 1 to 30 carbon atoms. Specific examples of formula (ED2) can be found in JP-A No. 2010-168539.

[0082] For specific examples of ether dimers, reference can be made to paragraph 0317 of JP2013-029760A, the contents of which are incorporated herein by reference.

[0083] As the resin, a resin containing a repeating unit having a polymerizable group can also be used.

[0084] The resin preferably contains a resin having an aromatic carboxyl group (hereinafter also referred to as resin Ac). In resin Ac, the aromatic carboxyl group may be contained in the main chain of the repeating unit or in a side chain of the repeating unit. The aromatic carboxyl group is preferably contained in the main chain of the repeating unit. In this specification, an aromatic carboxyl group refers to a group having a structure in which one or more carboxyl groups are bonded to an aromatic ring. In the aromatic carboxyl group, the number of carboxyl groups bonded to the aromatic ring is preferably 1 to 4, and more preferably 1 to 2.

[0085] It is also preferable to use a resin as a dispersant. Examples of dispersants include acidic dispersants (acidic resins) and basic dispersants (basic resins). Here, the term "acidic dispersant (acidic resin)" refers to a resin in which the amount of acid groups is greater than the amount of basic groups. As the acidic dispersant (acidic resin), a resin in which the amount of acid groups is 70 mol % or more is preferred when the total amount of the acid groups and the basic groups is 100 mol %. The acid groups possessed by the acidic dispersant (acidic resin) are preferably carboxyl groups. The acid value of the acidic dispersant (acidic resin) is preferably 10 to 105 mgKOH / g. Furthermore, the term "basic dispersant (basic resin)" refers to a resin in which the amount of basic groups is greater than the amount of acid groups. As the basic dispersant (basic resin), a resin in which the amount of basic groups is greater than 50 mol % is preferred when the total amount of the acid groups and the basic groups is 100 mol %. The basic groups possessed by the basic dispersant are preferably amino groups.

[0086] The resin used as the dispersant is preferably a graft resin. For details of the graft resin, please refer to the description in paragraphs 0025 to 0094 of JP-A No. 2012-255128, the contents of which are incorporated herein by reference.

[0087] The resin used as the dispersant is also preferably a resin having an aromatic carboxyl group (resin Ac). Examples of the resin having an aromatic carboxyl group include those mentioned above.

[0088] The resin used as the dispersant is preferably a polyimine-based dispersant containing a nitrogen atom in at least one of the main chain and the side chain. The polyimine-based dispersant is preferably a resin having a main chain with a partial structure having a functional group with a pKa of 14 or less and a side chain having 40 to 10,000 atoms, and having a basic nitrogen atom in at least one of the main chain and the side chain. There are no particular restrictions on the basic nitrogen atom, as long as it is a nitrogen atom that exhibits basicity. For details about polyimine-based dispersants, please refer to the description in paragraphs 0102 to 0166 of JP 2012-255128 A, the contents of which are incorporated herein by reference.

[0089] The resin used as a dispersant is preferably a resin having a structure in which multiple polymer chains are bonded to a core portion. Examples of such resins include dendrimers (including star-shaped polymers). Specific examples of dendrimers include polymer compounds C-1 to C-31 described in paragraphs 0196 to 0209 of JP 2013-043962 A.

[0090] The resin used as a dispersant is also preferably a resin containing a repeating unit having an ethylenically unsaturated bond-containing group in a side chain. The content of the repeating unit having an ethylenically unsaturated bond-containing group in a side chain is preferably 10 mol % or more, more preferably 10 to 80 mol %, and even more preferably 20 to 70 mol %, of all repeating units of the resin.

[0091] Further, the dispersant includes the block copolymers (EB-1) to (EB-9) described in paragraphs 0219 to 0221 of Japanese Patent No. 6432077, resins described in JP-A-2018-087939, polyethyleneimine having a polyester side chain described in WO 2016 / 104803, block copolymers described in WO 2019 / 125940, block polymers having an acrylamide structural unit described in JP-A-2020-066687, block polymers having an acrylamide structural unit described in JP-A-2020-066688, dispersants described in WO 2016 / 104803, and resins described in JP-A-2019-095548.

[0092] Dispersants are also commercially available, and specific examples include the BYK series and DISPERBYK series manufactured by BYK-Chemie, the SOLSPERSE series manufactured by Lubrizol Japan, and the Efka series manufactured by BASF. Also, the products described in paragraph 0129 of JP 2012-137564 A and the products described in paragraph 0235 of JP 2017-194662 A can be used as dispersants. The resins described above as dispersants can also be used for purposes other than dispersants. For example, they can be used as binders.

[0093] The content of the resin in the total solid content of the coloring composition is preferably 1 to 60% by mass. The lower limit is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and particularly preferably 20% by mass or more. The upper limit is preferably 50% by mass or less, more preferably 40% by mass or less. The coloring composition may contain only one type of resin, or may contain two or more types of resin. When two or more types of resins are contained, the total amount thereof is preferably within the above range.

[0094] (pigment derivatives) The coloring composition may contain a pigment derivative. When a pigment is used as the colorant, the coloring composition preferably further contains a pigment derivative. Examples of the pigment derivative include a compound having a structure in which an acid group or a basic group is bonded to a dye skeleton.

[0095] Examples of dye skeletons that constitute pigment derivatives include quinoline dye skeletons, benzimidazolone dye skeletons, benzisoindole dye skeletons, benzothiazole dye skeletons, iminium dye skeletons, squarylium dye skeletons, croconium dye skeletons, oxonol dye skeletons, pyrrolopyrrole dye skeletons, diketopyrrolopyrrole dye skeletons, azo dye skeletons, azomethine dye skeletons, phthalocyanine dye skeletons, naphthalocyanine dye skeletons, anthraquinone dye skeletons, dianthraquinone dye skeletons, quinacridone dye skeletons, dioxazine dye skeletons, perinone dye skeletons, and perylene dye skeletons. skeleton, thiazine indigo dye skeleton, thioindigo dye skeleton, isoindoline dye skeleton, isoindolinone dye skeleton, quinophthalone dye skeleton, iminium dye skeleton, dithiol dye skeleton, triarylmethane dye skeleton, pyrromethene dye skeleton, etc., and a phthalocyanine dye skeleton, a diketopyrrolopyrrole dye skeleton, a pyrrolopyrrole dye skeleton, a benzisoindole dye skeleton, an anthraquinone dye skeleton, a dianthraquinone dye skeleton, a thiazine indigo dye skeleton, an azo dye skeleton, quinophthalone dye skeleton, or a quinacridone dye skeleton is preferred.

[0096] Examples of the acid group include a carboxyl group, a sulfo group, a phosphoric acid group, a boronic acid group, a carboxylic acid amide group, a sulfonic acid amide group, an imidic acid group, and salts thereof. Examples of the atom or atomic group constituting the salt include an alkali metal ion (Li + , Na + , K. + etc.), alkaline earth metal ions (Ca 2+ , Mg 2+ Examples of the carboxylic acid amide group include -NHCOR X1 As the sulfonamide group, a group represented by -NHSO2R is preferred. X2 As the imide acid group, a group represented by -SO2NHSO2R is preferred. X3 , -CONHSO2R X4 , -CONHCOR X5 or -SO2NHCOR X6 A group represented by the formula: -SO2NHSO2R is preferred.X3 is more preferable. X1 ~R X6 R each independently represents an alkyl group or an aryl group. X1 ~R X6 The alkyl group and aryl group represented by may have a substituent. The substituent is preferably a halogen atom, more preferably a fluorine atom.

[0097] Examples of basic groups include amino groups, pyridinyl groups and their salts, ammonium salts, and phthalimidomethyl groups. Examples of atoms or atomic groups that constitute salts include hydroxide ions, halogen ions, carboxylate ions, sulfonate ions, and phenoxide ions.

[0098] Specific examples of pigment derivatives include compounds described in JP-A-56-118462, compounds described in JP-A-63-264674, compounds described in JP-A-01-217077, compounds described in JP-A-03-009961, compounds described in JP-A-03-026767, compounds described in JP-A-03-153780, compounds described in JP-A-03-045662, and JP-A-04-285669. compounds described in JP-A-06-145546, compounds described in JP-A-06-212088, compounds described in JP-A-06-240158, compounds described in JP-A-10-030063, compounds described in JP-A-10-195326, compounds described in paragraphs 0086 to 0098 of WO 2011 / 024896, and compounds described in paragraphs 0063 to 0069 of WO 2012 / 102399 094, compounds described in paragraph 0082 of WO 2017 / 038252, compounds described in paragraph 0171 of JP 2015-151530 A, compounds described in paragraphs 0162 to 0183 of JP 2011-252065 A, compounds described in JP 2003-081972 A, compounds described in Japanese Patent No. 5299151 A, compounds described in JP 2015-172732 A, compounds described in JP 201 Examples of the compounds include compounds described in JP-A-4-199308, compounds described in JP-A-2014-085562, compounds described in JP-A-2014-035351, compounds described in JP-A-2008-081565, compounds described in JP-A-2019-109512, compounds described in JP-A-2019-133154, and diketopyrrolopyrrole compounds having a thiol linking group described in WO 2020 / 002106.

[0099] The content of the pigment derivative in the total solid content of the coloring composition is preferably 0.3 to 20% by mass. The lower limit is preferably 0.6% by mass or more, and more preferably 0.9% by mass or more. The upper limit is preferably 15% by mass or less, more preferably 12.5% ​​by mass or less, and even more preferably 10% by mass or less. The content of the pigment derivative is preferably 1 to 30 parts by mass per 100 parts by mass of the pigment. The lower limit is preferably 2 parts by mass or more, and more preferably 3 parts by mass or more. The upper limit is preferably 25 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 15% by mass or less. Only one type of pigment derivative may be used, or two or more types may be used in combination. When two or more types are used in combination, the total amount thereof is preferably within the above range.

[0100] (Compounds having a cyclic ether group) The coloring composition may contain a compound having a cyclic ether group. Examples of the cyclic ether group include an epoxy group and an oxetanyl group.

[0101] The compound having a cyclic ether group may be either a low molecular weight compound (for example, a molecular weight of less than 2000, or even less than 1000) or a high molecular weight compound (macromolecule) (for example, a molecular weight of 1000 or more, and in the case of a polymer, a weight average molecular weight of 1000 or more). The weight average molecular weight of the epoxy compound is preferably 200 to 100,000, more preferably 500 to 50,000. The upper limit of the weight average molecular weight is preferably 10,000 or less, more preferably 5,000 or less, and even more preferably 3,000 or less.

[0102] The compound having a cyclic ether group is preferably a compound having an epoxy group (hereinafter also referred to as an epoxy compound). As the epoxy compound, the compounds described in paragraphs 0034 to 0036 of JP 2013-011869 A, paragraphs 0147 to 0156 of JP 2014-043556 A, paragraphs 0085 to 0092 of JP 2014-089408 A, and the compounds described in JP 2017-179172 A can also be used. The contents of these compounds are incorporated herein by reference.

[0103] Commercially available compounds having a cyclic ether group include, for example, EHPE3150 (manufactured by Daicel Corporation), EPICLON N-695 (manufactured by DIC Corporation), Marproof G-0150M, G-0105SA, G-0130SP, G-0250SP, G-1005S, G-1005SA, G-1010S, G-2050M, G-01100, and G-01758 (all manufactured by NOF Corporation, epoxy group-containing polymers).

[0104] The content of the compound having a cyclic ether group in the total solid content of the coloring composition is preferably 0.1 to 20% by mass. The lower limit is, for example, preferably 0.5% by mass or more, and more preferably 1% by mass or more. The upper limit is, for example, preferably 15% by mass or less, and even more preferably 10% by mass or less. The compound having a cyclic ether group may be one type, or two or more types. When two or more types are used, the total amount thereof preferably falls within the above range.

[0105] (ultraviolet absorber) The coloring composition may contain an ultraviolet absorber. Examples of ultraviolet absorbers include conjugated diene compounds, aminodiene compounds, salicylate compounds, benzophenone compounds, benzotriazole compounds, acrylonitrile compounds, hydroxyphenyltriazine compounds, indole compounds, and triazine compounds. Specific examples of such compounds include those described in paragraphs 0038 to 0052 of JP 2009-217221 A, paragraphs 0052 to 0072 of JP 2012-208374 A, paragraphs 0317 to 0334 of JP 2013-068814 A, and paragraphs 0061 to 0080 of JP 2016-162946 A, the contents of which are incorporated herein by reference. Commercially available UV absorbers include UV-503 (manufactured by Daito Chemical Co., Ltd.), the Tinuvin series and Uvinul series manufactured by BASF, and the Sumisorb series manufactured by Sumika Chemtex Co., Ltd. Benzotriazole compounds include the MYUA series manufactured by Miyoshi Oil & Fats (The Chemical Daily, February 1, 2016). The UV absorber may also be a compound described in paragraphs 0049-0059 of Japanese Patent No. 6268967, a compound described in paragraphs 0059-0076 of International Publication No. 2016 / 181987, or a thioaryl-substituted benzotriazole UV absorber described in International Publication No. 2020 / 137819. The content of the UV absorber in the total solid content of the coloring composition is preferably 0.01 to 10% by mass, more preferably 0.01 to 5% by mass. The ultraviolet absorbent may be used alone or in combination of two or more kinds. When two or more kinds are used, the total amount thereof is preferably in the above range.

[0106] (polymerization inhibitor) The coloring composition may contain a polymerization inhibitor. Examples of the polymerization inhibitor include hydroquinone, p-methoxyphenol, di-tert-butyl-p-cresol, pyrogallol, tert-butylcatechol, benzoquinone, 4,4'-thiobis(3-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-methyl-6-t-butylphenol), and N-nitrosophenylhydroxyamine salts (ammonium salts, cerous salts, etc.). Among these, p-methoxyphenol is preferred. The content of the polymerization inhibitor in the total solid content of the coloring composition is preferably 0.0001 to 5% by mass. Only one type of polymerization inhibitor may be used, or two or more types may be used. When two or more types are used, the total amount thereof is preferably within the above range.

[0107] (Silane coupling agent) The coloring composition may contain a silane coupling agent. Examples of the silane coupling agent include N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBM-602), N-β-aminoethyl-γ-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBM-603), N-β-aminoethyl-γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBE-602), γ-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBM-903), γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBE-903), 3-methacryloxypropylmethyldimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBM-502), and 3-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KBM-503). Examples of silane coupling agents include the compounds described in paragraphs 0018 to 0036 of JP-A No. 2009-288703 and the compounds described in paragraphs 0056 to 0066 of JP-A No. 2009-242604, the contents of which are incorporated herein by reference. The content of the silane coupling agent in the total solid content of the coloring composition is preferably 0.01 to 15.0 mass%, more preferably 0.05 to 10.0 mass%. Only one type of silane coupling agent may be used, or two or more types may be used. When two or more types are used, the total amount preferably falls within the above range.

[0108] (surfactant) The coloring composition may contain a surfactant. As the surfactant, various surfactants such as a fluorine-based surfactant, a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a silicone-based surfactant may be used. The surfactant is preferably a silicone-based surfactant or a fluorine-based surfactant. For details of the surfactant, reference may be made to the surfactants described in paragraphs 0238 to 0245 of WO 2015 / 166779, the contents of which are incorporated herein by reference.

[0109] Examples of fluorine-based surfactants include those described in paragraphs 0060 to 0064 of JP 2014-041318 A (corresponding paragraphs 0060 to 0064 of WO 2014 / 017669 A), those described in paragraphs 0117 to 0132 of JP 2011-132503 A, and those described in JP 2020-008634 A, the contents of which are incorporated herein by reference. Commercially available fluorine-based surfactants include, for example, Megafac F-171, F-172, F-173, F-176, F-177, F-141, F-142, F-143, F-144, F-437, F-475, F-477, F-479, F-482, F-554, F-555-A, F-556, F-557, F-558, F-559, F-560, F-561, F-565, F-563, F-568, F-575, F-780, EXP, MFS-330, R-01, and R- 40, R-40-LM, R-41, R-41-LM, RS-43, R-43, TF-1956, RS-90, R-94, RS-72-K, DS-21 (all manufactured by DIC Corporation), Fluorard FC430, FC431, FC171 (all manufactured by Sumitomo 3M Limited), Surflon S-382, SC-101, SC-103, SC-104, SC-105, SC-1068, SC-381, SC-383, S-393, KH-40 (all manufactured by AGC Inc.), PolyFox Examples include PF636, PF656, PF6320, PF6520, and PF7002 (all manufactured by OMNOVA), Ftergent 208G, 215M, 245F, 601AD, 601ADH2, 602A, 610FM, 710FL, 710FM, 710FS, and FTX-218 (all manufactured by NEOS Corporation).

[0110] The fluorosurfactant may be an acrylic compound having a molecular structure with a functional group containing a fluorine atom, and when heated, the functional group containing the fluorine atom is cleaved, causing the fluorine atom to volatilize. Examples of such fluorosurfactants include the Megafac DS series manufactured by DIC Corporation (The Chemical Daily, February 22, 2016; The Nikkei Business Daily, February 23, 2016), such as Megafac DS-21.

[0111] It is also preferable to use a polymer of a fluorine atom-containing vinyl ether compound having a fluorinated alkyl group or a fluorinated alkylene ether group and a hydrophilic vinyl ether compound as the fluorine-containing surfactant. Examples of such a fluorine-containing surfactant include the fluorine-containing surfactants described in JP 2016-216602 A, the contents of which are incorporated herein by reference.

[0112] The fluorine-containing surfactant may also preferably be a fluorine-containing polymer compound containing a repeating unit derived from a (meth)acrylate compound having a fluorine atom and a repeating unit derived from a (meth)acrylate compound having two or more (preferably five or more) alkyleneoxy groups (preferably ethyleneoxy groups or propyleneoxy groups). Examples of such fluorine-containing surfactants include those described in paragraphs 0016 to 0037 of JP-A No. 2010-032698, and compounds having the following structure. The weight-average molecular weight of these surfactants is preferably 3,000 to 50,000, e.g., 14,000. In the formula, % indicating the proportion of repeating units is mol %. [ka]

[0113] The fluorine-containing surfactant may be a fluorine-containing polymer having an ethylenically unsaturated bond-containing group in its side chain. Specific examples include the compounds described in paragraphs 0050 to 0090 and 0289 to 0295 of JP 2010-164965 A, and Megafac RS-101, RS-102, RS-718K, and RS-72-K manufactured by DIC Corporation. The fluorine-containing surfactant may also be the compounds described in paragraphs 0015 to 0158 of JP 2015-117327 A.

[0114] It is also preferable to use the surfactants described in WO 2020 / 084854 as a substitute for surfactants having a perfluoroalkyl group having 6 or more carbon atoms from the viewpoint of environmental regulations.

[0115] Nonionic surfactants include glycerol, trimethylolpropane, trimethylolethane, and their ethoxylates and propoxylates (for example, glycerol propoxylate, glycerol ethoxylate, etc.), polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl ether, polyethylene glycol dilaurate, polyethylene glycol distearate, and sorbitan fatty acid. Examples of suitable surfactants include esters, Pluronic L10, L31, L61, L62, 10R5, 17R2, and 25R2 (manufactured by BASF), Tetronic 304, 701, 704, 901, 904, and 150R1 (manufactured by BASF), Solsperse 20000 (manufactured by Lubrizol Japan Co., Ltd.), NCW-101, NCW-1001, and NCW-1002 (manufactured by Fujifilm Wako Pure Chemical Industries Co., Ltd.), Paionin D-6112, D-6112-W, and D-6315 (manufactured by Takemoto Oil & Fat Co., Ltd.), Olfine E1010, and Surfynol 104, 400, and 440 (manufactured by Nissin Chemical Industry Co., Ltd.).

[0116] Examples of silicone surfactants include DOWSIL SH8400, SH8400 FLUID, FZ-2122, 67 Additive, 74 Additive, M Additive, and SF 8419 OIL (manufactured by Dow-Toray Industries, Inc.), TSF-4300, TSF-4445, TSF-4460, and TSF-4452 (manufactured by Momentive Performance Materials), KP-341, KF-6000, KF-6001, KF-6002, and KF-6003 (manufactured by Shin-Etsu Chemical Co., Ltd.), and BYK-307, BYK-322, BYK-323, BYK-330, BYK-333, BYK-3760, and BYK-UV3510 (manufactured by BYK-Chemie).

[0117] Furthermore, the silicone surfactant may also be a compound having the following structure: [ka]

[0118] The content of the surfactant in the total solid content of the coloring composition is preferably 0.001% by mass to 5.0% by mass, and more preferably 0.005% by mass to 3.0% by mass. The surfactant may be one type or two or more types. When two or more types are used, the total amount thereof is preferably within the above range.

[0119] (Other ingredients) The coloring composition may contain, as necessary, sensitizers, curing accelerators, antioxidants, latent antioxidants, plasticizers, and other auxiliary agents (e.g., conductive particles, fillers, antifoaming agents, flame retardants, leveling agents, release accelerators, fragrances, surface tension modifiers, chain transfer agents, etc.). By appropriately incorporating these components, film properties and other properties can be adjusted. For details of these components, please refer to, for example, paragraphs 0183 and after of JP 2012-003225 A (corresponding to paragraph 0237 of U.S. Patent Application Publication No. 2013 / 0034812), and paragraphs 0101 to 0104 and 0107 to 0109 of JP 2008-250074 A, the contents of which are incorporated herein by reference. Further, as the curing accelerator, compounds described in paragraphs 0094 to 0097 of International Publication No. 2018 / 056189, JP-A-2015-034963, JP-A-2013-041165, JP-A-2013-041165, JP-A-2014-055114, JP-A-2012-150180, JP-A-2011-253054 ... Examples of antioxidants include phenolic compounds, phosphite ester compounds, and thioether compounds. The antioxidant may also be a compound having a phenol group and a phosphite ester group in the same molecule. The antioxidant may also be a phosphorus-based antioxidant. The antioxidant may also be a compound described in Korean Patent Publication No. 10-2019-0059371. Examples of latent antioxidants include compounds in which the moiety functioning as an antioxidant is protected with a protecting group, and the compound functions as an antioxidant when heated at 100 to 250°C or at 80 to 200°C in the presence of an acid / base catalyst, resulting in the elimination of the protecting group. Examples of latent antioxidants include the compounds described in WO 2014 / 021023, WO 2017 / 030005, and JP 2017-008219 A. Commercially available latent antioxidants include ADEKA ARCLES GPA-5001 (manufactured by ADEKA Corporation).

[0120] The solid content of the coloring composition is preferably 5 to 40% by mass. The lower limit is preferably 7.5% by mass or more, and more preferably 10% by mass or more. The upper limit is preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. The solid content of the coloring composition can be adjusted by the amount of organic solvent added.

[0121] The viscosity of the coloring composition at 25° C. is preferably 0.3 to 50 mPa·s, and more preferably 0.5 to 20 mPa·s. The viscosity of the coloring composition can be measured, for example, using a cone rotor type viscometer (for example, RE-85L manufactured by Toki Sangyo Co., Ltd.) with the temperature of the coloring composition adjusted to 25° C.

[0122] The coloring composition is preferably used as a coloring composition for forming an optical filter or a light-shielding film. Examples of optical filters include color filters and near-infrared transmission filters. The coloring composition is also preferably used for solid-state imaging devices. More specifically, the coloring composition is preferably used as a coloring composition for forming an optical filter used in a solid-state imaging device, and more preferably used as a coloring composition for forming colored pixels of a color filter used in a solid-state imaging device. [Example]

[0123] The present invention will be specifically described below with reference to examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0124] Example 1 A 200 L mixing tank (5 years old) equipped with a propeller-shaped agitator was used as the coloring composition production equipment. The raw materials listed in the table below were added to the mixing tank and stirred for 3 hours to produce a pigment-containing coloring composition 1. The produced coloring composition 1 was discharged from the mixing tank, and the mixing tank was then disassembled to remove the agitator. The agitator was then immersed in N-methyl-2-pyrrolidone at 21 to 25°C and ultrasonically cleaned by irradiating it with 25 kHz ultrasound for 1 hour. The agitator was then removed from the N-methyl-2-pyrrolidone and ultrasonically cleaned by immersing it in propylene glycol monomethyl ether acetate at 23°C and irradiating it with 25 kHz ultrasound for 2 hours. The mixing tank was cleaned by spraying and circulating N-methyl-2-pyrrolidone into the interior using a spray ball attached to the top of the mixing layer, and then spraying and circulating propylene glycol monomethyl ether acetate in the same manner. After drying, an agitator was attached to the mixing vessel, and cleaning of the manufacturing equipment was completed.

[0125] Example 2 Cleaning was carried out in the same manner as in Example 1, except that ultrasonic cleaning was carried out using propylene glycol monomethyl ether acetate at 21 to 25°C instead of N-methyl-2-pyrrolidone in Example 1. The mixing tank was cleaned in the same manner as in Example 1. After drying, an agitator was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0126] Example 3 Cleaning was carried out in the same manner as in Example 1, except that ultrasonic cleaning was carried out using propylene glycol monomethyl ether at 21 to 25°C instead of N-methyl-2-pyrrolidone in Example 1. The mixing tank was cleaned in the same manner as in Example 1. After drying, an agitator was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0127] Example 4 Cleaning was carried out in the same manner as in Example 1, except that ultrasonic cleaning was carried out using cyclohexanone at 21 to 25°C instead of N-methyl-2-pyrrolidone in Example 1. The mixing tank was cleaned in the same manner as in Example 1. After drying, an agitator was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0128] Example 5 The same colored composition manufacturing apparatus as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce a pigment-containing colored composition 2. The produced colored composition 2 was discharged from the mixing tank, and then the stirrer and mixing tank were cleaned in the same manner as in Example 1. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing apparatus was completed.

[0129] Example 6 The same colored composition manufacturing apparatus as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce a pigment-containing colored composition 3. The produced colored composition 3 was discharged from the mixing tank, and then the stirrer and mixing tank were cleaned in the same manner as in Example 1. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing apparatus was completed.

[0130] Example 7 A colored composition 1 was produced in the same manner as in Example 1, except that a 200 L mixing tank (20 years in use) equipped with a propeller blade-shaped agitator was used as the colored composition production equipment. The mixing tank and agitator used in Example 7 had been used for a longer period of time than those used in Example 1, and therefore had more scratches on the surface than those used in Example 1. The colored composition 1 after production was discharged from the mixing tank, and then the agitator and mixing tank were cleaned in the same manner as in Example 1. After drying, the agitator was attached to the mixing tank, and cleaning of the production equipment was completed.

[0131] Example 8 Cleaning was carried out in the same manner as in Example 1, except that ultrasonic cleaning using N-methyl-2-pyrrolidone was followed by spray ball cleaning using propylene glycol monomethyl ether acetate. The mixing tank was cleaned in the same manner as in Example 1. After drying, an agitator was attached to the mixing tank, completing the cleaning of the manufacturing equipment.

[0132] Example 9 The same colored composition manufacturing apparatus as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce colored composition 4 containing a pigment and a dye. After production, colored composition 4 was discharged from the mixing tank, and then the stirrer and mixing tank were cleaned in the same manner as in Example 1. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing apparatus was completed.

[0133] (Comparative Example 1) The same colored composition manufacturing equipment as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce colored composition 1. After production, colored composition 1 was discharged from the mixing tank, and then the mixing tank was disassembled to remove the stirrer, which was then brush-cleaned for 1 hour using N-methyl-2-pyrrolidone at 21 to 25°C. The mixing tank was cleaned by circulating cleaning using N-methyl-2-pyrrolidone. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0134] (Comparative Example 2) The same colored composition manufacturing equipment as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce colored composition 2. After production, colored composition 2 was discharged from the mixing tank, and then the mixing tank was disassembled to remove the stirrer, which was then brush-cleaned for 1 hour using N-methyl-2-pyrrolidone at 21 to 25°C. The mixing tank was cleaned by circulating cleaning using N-methyl-2-pyrrolidone. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0135] (Comparative Example 3) The same colored composition manufacturing equipment as in Example 1 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce colored composition 3. After production, colored composition 3 was discharged from the mixing tank, and then the mixing tank was disassembled to remove the stirrer, which was then brush-cleaned for 1 hour using N-methyl-2-pyrrolidone at 21 to 25°C. The mixing tank was cleaned by circulating cleaning using N-methyl-2-pyrrolidone. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0136] Comparative Example 4 The same colored composition manufacturing equipment as in Example 7 was used. The raw materials listed in the table below were added to a mixing tank and stirred for 3 hours to produce colored composition 1. After production, colored composition 1 was discharged from the mixing tank, and then the mixing tank was disassembled to remove the stirrer, which was then brush-cleaned for 1 hour using N-methyl-2-pyrrolidone at 21 to 25°C. The mixing tank was cleaned by circulating cleaning using N-methyl-2-pyrrolidone. After drying, the stirrer was attached to the mixing tank, and cleaning of the manufacturing equipment was completed.

[0137] [Table 1]

[0138] Details of the raw materials listed as abbreviations in the table above are as follows. The table also lists the solid content concentration (mass%) and viscosity (mPa·s) of the coloring composition. The viscosity of the coloring composition was measured using an "RE-85L" manufactured by Toki Sangyo Co., Ltd., with the temperature of the coloring composition adjusted to 25°C.

[0139] (dispersion) A1: Titanium black dispersion (average particle size of titanium black: 5 nm, solid content: 20% by mass) A2: Titanium black dispersion (average particle size of titanium black: 20 nm, solid content: 8% by mass) A3: Dispersion of an 80 / 20 (mass ratio) mixture of CI Pigment Blue 15:6 and the following dye (weight average molecular weight: 7000, n and m are 3) (solid concentration: 20 mass%) [ka]

[0140] (organic solvent) C1: Propylene glycol monomethyl ether acetate

[0141] (polymerizable monomer) D1: KAYARAD DPHA (Nippon Kayaku Co., Ltd.)

[0142] (Photopolymerization initiator) E1: Irgacure OXE02 (BASF)

[0143] (resin) F1: Benzyl methacrylate / methacrylic acid copolymer (weight molecular weight 10,000, benzyl methacrylate / methacrylic acid = 70 / 30 (molar ratio))

[0144] (surfactant) G1: Megafac F-554 (DIC Corporation)

[0145] <Evaluation of cleaning ability> 50 L of propylene glycol monomethyl ether acetate was added to a mixing vessel equipped with a stirrer and stirred for 1 hour. The propylene glycol monomethyl ether acetate was then removed from the mixing vessel. The propylene glycol monomethyl ether acetate removed from the mixing vessel was measured for its maximum absorbance (maximum abs) at wavelengths of 190 to 800 nm, the amount of metal impurities, and the amount of particles in the liquid. The evaluation results are shown in the table below. If the maximum absorbance (maximum abs) at wavelengths of 190 to 800 nm is 0.1 or less, the amount of metal impurities is 67 ppb or less, and the amount of particles in the liquid is 1 particle / ml or less, it is determined that the coloring composition adhering to the manufacturing equipment has been completely cleaned and removed. The maximum absorbance (maximum abs) at wavelengths of 190 to 800 nm was measured using a spectrophotometer (U-3000, manufactured by Hitachi High-Technologies Corporation). The amount of metal impurities was measured using an ICP-MS Agilent 7700 manufactured by Agilent Technologies, Inc. The amount of metal impurities refers to the total amount of Li, Na, Mg, Al, K, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb. The amount of particles in the liquid was measured using a liquid particle counter (KS-41A, manufactured by Rion Co., Ltd.).

[0146] [Table 2]

[0147] As shown in the table above, in Examples 1 to 9, the maximum abs was 0.1 or less, the amount of metal impurities was 67 ppb or less, and the amount of particles in the liquid was 1 particle / ml or less, and the coloring composition adhering to the manufacturing equipment was completely washed away. On the other hand, in the comparative example, at least one of the maximum abs, the amount of metal impurities, and the amount of particles in the liquid did not meet the standard, and the coloring composition adhering to the manufacturing equipment was not sufficiently washed away.

Claims

1. A method for cleaning a production apparatus after a colored composition is produced by mixing raw materials containing a colorant and an organic solvent in a production apparatus having a mixing tank equipped with a stirrer and discharging the colored composition from the production apparatus, comprising: ultrasonically cleaning the stirrer using a solvent containing an organic solvent; The ultrasonic cleaning is performed multiple times using different solvents, The final ultrasonic cleaning is performed using a solvent containing the same organic solvent as that contained in the coloring composition produced using the manufacturing equipment after cleaning. Cleaning method.

2. 2. The cleaning method according to claim 1, wherein the temperature of the solvent used in the ultrasonic cleaning is 15 to 50°C.

3. A cleaning method as described in claim 1 or 2, wherein the organic solvent contained in the solvent used for the ultrasonic cleaning includes at least one selected from ester-based solvents, ketone-based solvents, amide-based solvents and ether-based solvents.

4. 3. The cleaning method according to claim 1, wherein the organic solvent contained in the solvent used in the ultrasonic cleaning comprises at least one selected from the group consisting of N-methyl-2-pyrrolidone, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, and cyclohexanone.

5. The cleaning method according to any one of claims 1 to 4, wherein the ultrasonic frequency in the ultrasonic cleaning is 10 to 100 kHz and the ultrasonic irradiation time is 30 to 120 minutes.

6. The cleaning method according to any one of claims 1 to 5, wherein the colorant includes a black colorant.

7. The cleaning method according to any one of claims 1 to 6, wherein the colorant comprises a pigment and a dye.

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