JP2022096923A - Infrared transmission type coloring composition, infrared filter, infrared camera, and infrared sensor - Google Patents

Abstract

To provide an infrared transmission type coloring composition which is excellent in filterability and storage stability, low in initial viscosity, excellent in coating property, and high in heat resistance and solvent resistance, suppresses generation of foreign matter, suppresses transmission of a wavelength of 400 to 700 nm, and is capable of forming a film whose transmittance of the wavelength of 800 nm or more is excellent.SOLUTION: Disclosed is an infrared transmission type coloring composition which includes a colorant (A), a resin type dispersant (B), and a binder resin (C). 20-50 mass% of a copper phthalocyanine blue pigment, 20-50 mass% of a C.I. pigment yellow 139 and 15-45 mass% of a C.I. pigment violet 23 are contained in 100 mass% of the colorant (A). The total content of the colorant (A) is 40%-80% by mass with respect to the total non-volatile content of the infrared transmission type coloring composition.SELECTED DRAWING: None

Description

The present invention relates to an infrared transmissive coloring composition using an organic dye, an infrared transmissive filter, an infrared camera, and an infrared sensor.

In various optical system devices, a function of light separation that selectively transmits light of a specific wavelength is required. As a method for realizing this, there is a method of transmitting only light of a specific wavelength by utilizing the interference of the dielectric multilayer thin film (see Patent Document 1). This method has many advantages such as reliability and flexibility in wavelength selection design, but one of the disadvantages is angle dependence. Since the interference characteristics are determined by the optical film thickness, when the effective optical path length through which light passes changes due to oblique incidence, the wavelength of the transmitted light changes accordingly, and the desired filter characteristics can be obtained. It is known that it will disappear.
In order to solve this problem, a filter of a method using light absorption has been proposed. For example, colored glass in which a metal ion dye is dispersed in inorganic glass is known as a substance that absorbs light (see Patent Document 2 and Patent Document 3). This method is known to have problems such as harmfulness of coloring components (cadmium and the like), thickening of the optical film by using glass, processability and weight reduction. Therefore, from the viewpoint of solving these problems, a method for forming a light selection filter film using a dye on a base material such as a resin film is being developed. Among them, in the field of infrared sensors and infrared cameras, there is a need for a filter that shields light in the visible light region and transmits only light in the near infrared region. As an infrared transmissive coloring composition, a composition in which a plurality of organic pigments are combined is disclosed (Patent Documents 4, 5, 6 and 7).
Since a plurality of organic pigments are combined, there is a problem that it is difficult to secure sufficient quality in properties such as stability of the dispersion.

Japanese Unexamined Patent Publication No. 2001-331965 Japanese Unexamined Patent Publication No. 2004-250285 Japanese Patent Application Laid-Open No. 2003-146695 Japanese Unexamined Patent Publication No. 2013-077009 Japanese Unexamined Patent Publication No. 2014-130338 Japanese Unexamined Patent Publication No. 2015-63593 Japanese Unexamined Patent Publication No. 2016-177273

The present invention has good filterability and storage stability, low initial viscosity and excellent coatability, heat resistance and solvent resistance, suppresses foreign matter generation, and transmits at a wavelength of 400 to 700 nm. It is an object of the present invention to provide an infrared transmissive coloring composition capable of forming a film having a good transmittance with a wavelength of 800 nm or more.

The infrared transmissive coloring composition of the present invention is an infrared transmissive coloring composition containing a colorant (A), a resin type dispersant (B) and a binder resin (C).
20 to 50% by mass of copper phthalocyanine blue pigment in 100% by mass of the colorant (A), C.I. I. 20-50% by weight of Bigment Yellow 139, and C.I. I. Contains 15-45% by mass of Pigment Violet 23
The content of the colorant (A) is 40 to 80% by mass in the non-volatile content of the infrared transmissive coloring composition.

According to the present invention described above, the filterability and storage stability are good, the initial viscosity is low and the coatability is excellent, and the heat resistance and the solvent resistance are high, foreign matter generation is suppressed, and the wavelength 400. It is possible to provide an infrared transmissive coloring composition, an infrared transmissive filter, an infrared camera and an infrared sensor capable of suppressing transmission at a wavelength of about 700 nm and forming a film having a good transmittance at a wavelength of 800 nm or more.

The terms used herein are defined. When referred to as "(meth) acryloyl", "(meth) acrylic", "(meth) acrylic acid", or "(meth) acrylate", unless otherwise specified, "acryloyl and / or methacrylic acid", respectively. , "Acrylic and / or methacrylic", "acrylic acid and / or methacrylic acid", or "acrylate and / or methacrylate". Further, "CI" mentioned in the present specification means a color index (CI).

The infrared transmissive coloring composition of the present invention contains 20 to 50% by mass of a copper phthalocyanine blue pigment in 100% by mass of the colorant (A), C.I. I. 20-50% by weight of Bigment Yellow 139, and C.I. I. Contains 15-45% by mass of Pigment Violet 23
The content of the colorant (A) is 40 to 80% by mass in the non-volatile content of the infrared transmissive coloring composition.

The infrared transmissive coloring composition of the present invention comprises an infrared transmissive filter for a solid-state image pickup element, a near-infrared camera, a surveillance camera, an in-vehicle camera, a medical camera, an inspection / analysis camera, and an inspection camera filter, a temperature sensor, and the like. It can be used as an infrared transmission filter provided in an optical system such as a distance sensor, a medical sensor, a touch sensor such as a display, and a sensor using infrared light such as a biometric authentication sensor.

<Infrared transmissive coloring composition>
<Colorant (A)>
The colorant (A) in the present invention contains 20 to 50% by mass of the copper phthalocyanine blue pigment in a total of 100% by mass of the colorant (A), C.I. I. 20-50% by weight of Bigment Yellow 139, and C.I. I. Contains 15-45% by mass of Pigment Violet 23. As a result, light-shielding property can be obtained. The colorant (A) can contain other organic pigments, dyes, inorganic pigments and the like other than the organic pigments, if necessary. The content was 30 to 40% by mass of the copper phthalocyanine blue pigment, C.I. I. Bigment Yellow 139 in 30-45% by weight, and C.I. I. Pigment Violet 23 is preferably 20 to 35% by mass, and is more effective for enhancing the light-shielding property in the visible light region, particularly on the long wavelength side.

(Blue organic pigment: copper phthalocyanine blue pigment)
The copper phthalocyanine blue pigment is C.I. I. It is preferable to contain one or more selected from the group consisting of Bigment Blue 15: 3, 15: 4 and 15: 6. Among these, C.I. I. Bigment Blue 15: 6 is more preferred.

(Yellow organic pigment)
C. I. Other yellow pigments that can be used in combination with Bigment Yellow 139 include, for example, C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 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, 126, 127, 128, 129, 137, 138, 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, 198, 199, 213, 214, 218, 219, 220, 221, 231 or 233 and the like.

(Purple organic pigment)
C. I. Other purple pigments that can be used in combination with Bigment Violet 23 include, for example, C.I. I. Pigment Violet 1, 19, 27, 29, 30, 32, 37, 40, 42, 50 and the like.

(Other organic pigments)
Specific examples of other organic pigments are shown below by color index numbers.

The red organic pigment is, for example, C.I. I. Pigment Red 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 57: 1, 81, 81: 1, 81: 2, 81: 3, 81: 4, 97, 122, 123, 146, 149, 150, 168, 169, 176, 177, 178, 180, 184, 185, 187, 192, 200, 202, 208, 209, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 242, 246, 254, 255, 264, 268, 270, 272, 273, 274, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 295 or 296 and the like can be mentioned.

The orange organic pigment is, for example, C.I. I. Pigment Orange 36, 38, 43, 51, 55, 59, 61, 71, 73 and the like.

The green organic pigment is, for example, C.I. I. Pigment Green 7, 10, 36, 37, 58, 59, 62, 63 and the like.

The blue organic pigment is, for example, C.I. I. Pigment Blue 1, 1: 2, 1: 3, 2, 2: 1, 2: 2, 3, 8, 9, 10, 10: 1, 11, 12, 15, 16, 18, 19, 22, 24, 24: 1, 53, 56, 56: 1, 57, 58, 59, 60, 61, 62, 64 and the like can be mentioned.
(Inorganic pigment)
Inorganic pigments include, for example, titanium oxide, barium sulfate, zinc flower, lead sulfate, yellow lead, zinc yellow, red iron oxide (III), cadmium red, ultramarine blue, dark blue, chromium oxide green, cobalt green, etc. Amber, synthetic iron black and the like can be mentioned.

(dye)
Examples of the dye include acid dyes, direct dyes, basic dyes, salt-forming dyes, oil-soluble dyes, disperse dyes, reactive dyes, medium-dye dyes, building dyes, sulfide dyes and the like. Further, a derivative of a dye and a lake pigment obtained by converting a dye into a lake can also be mentioned.

The dye is a salt-forming compound of an acidic dye having an acidic group such as sulfonic acid or carboxylic acid and a quaternary ammonium salt compound, a tertiary amine compound, a secondary amine compound, or a primary amine compound; these amino groups are used. Examples thereof include a resin component having a resin component and a salt-forming compound such as an acidic dye. A salt-forming compound of an acid dye and a compound having an onium base is also preferable because it has excellent fastness. The compound having an onium base is preferably a resin having a cationic group in the side chain.

The chemical structure of the dye is, for example, azo dye, disazo dye, azomethin dye (Indoaniline dye, Indophenol dye, etc.), Dipyrromethene dye, Kinon dye (benzoquinone dye, naphthoquinone dye, anthraquinone dye). Dyes, anthrapyridone dyes, etc.), carbonium dyes (diphenylmethane dyes, triphenylmethane dyes, xanthene dyes, acridin dyes, etc.), quinoneimine dyes (oxazine dyes, thiazine dyes, etc.), azine dyes , Polymethine dyes (oxonol dyes, merocyanine dyes, allylidene dyes, styryl dyes, cyanine dyes, squarylium dyes, croconium dyes, etc.), quinophthalone dyes, phthalocyanine dyes, subphthalocyanine dyes, perinone dyes Examples thereof include dyes, indigo dyes, thioindigo dyes, quinoline dyes, nitro dyes, nitroso dyes, and rhodamine dyes. Among these, from the viewpoint of color characteristics such as hue, color separability, and color unevenness, azo dyes, xanthene dyes, cyanine dyes, triphenylmethane dyes, anthraquinone dyes, dipyrromethene dyes, and squarylium dyes, Kinophthalone dyes, phthalocyanine dyes, and subphthalocyanine dyes are preferable, and xanthene dyes, cyanine dyes, triphenylmethane dyes, anthraquinone dyes, dipyrromethene dyes, and phthalocyanine dyes are more preferable. The specific structure of dyes is "New Edition Dye Handbook" (Society of Synthetic Organic Chemistry; Maruzen, 1970), "Color Index" (The Society of Dyers and colorists), "Dye Handbook" (Okawara et al.; Kodansha, 1986). It is described in.

<Resin type dispersant (B)>
The resin-type dispersant (B) in the present invention preferably contains an acidic resin-type dispersant (B1) having an acid value of 30 to 80 mgKOH / g. As a result, there is no transmission of light in the visible region, and excellent shielding properties can be exhibited. Moreover, it produces excellent effects in low viscosity, high storage stability, heat resistance, foreign matter, solvent resistance, and filterability. Further, the resin type dispersant may contain other resin type dispersants such as an acid resin type dispersant having an acid value of 30 to 80 mgKOH / g, a basic resin type dispersant having an amine value, and the like.

Further, in the present invention, in the acidic resin type dispersant (B1), the acidic resin type dispersant (B1-1) having an acid value of 30 to 50 mgKOH / g and the acidic resin having an acid value of 55 to 80 mgKOH / g. It is preferable to use a type dispersant (B1-1) in combination. By using these in combination, the adsorption balance of the pigment as a colorant and the resin-type dispersant on the dye derivative is improved, and excellent properties are exhibited in viscosity stability and filterability over time.

[Acid resin type dispersant (B1)]
Examples of the acidic dispersant include those having a carboxyl group, a sulfone group, a phosphoric acid group, etc. in the resin, and a resin type dispersant having a carboxyl group is preferable from the viewpoint of viscosity stability and heat resistance. As the shape of the resin type dispersant having a carboxyl group, there are a linear resin type dispersant and a comb type resin type dispersant.

Further, the acidic resin type dispersant (B1) in the present invention is a reaction product (S1) of a polymer having a hydroxyl group at at least one terminal and a tetracarboxylic acid dianhydride, and / or a compound having a hydroxyl group. A comb-shaped resin-type dispersant that is a reaction product (S2) that polymerizes an ethylenically unsaturated monomer in the presence of a reaction product of a hydroxyl group and an acid anhydride group of tetracarboxylic acid dianhydride. It is preferable to have.

<Linear acidic resin type dispersant>
All linear resin-type dispersants having a carboxyl group can be produced by using known methods. For example, JP-A-2009-251481, JP-A-2007-23195, JP-A-1996- It can be synthesized by using a known method as shown in JP-A-143651. As an example of a method for producing a linear dispersant, a dispersant having a carboxyl group is produced by using a vinyl polymer having one hydroxyl group at one end as a raw material and adding a tricarboxylic acid anhydride to the hydroxyl group. Can be done.

<Comb-shaped acid resin-type dispersant>
The comb-shaped acidic resin-type dispersants (S1) and (S2) will be described below.
[Comb-shaped resin-type dispersant (S1)]
The comb-shaped acidic resin-type dispersant (S1) can be produced by a known method such as WO2008 / 007776, JP-A-2008-029901, and JP-A-2009-155406.
For example, a resin-type dispersant that is a reaction product of a hydroxyl group of a polymer having a hydroxyl group and an acid anhydride group of a tetracarboxylic acid dianhydride, or a hydroxyl group of a compound having a hydroxyl group and a tetracarboxylic acid dianhydride. Examples thereof include a resin-type dispersant which is a polymer obtained by polymerizing an ethylenically unsaturated monomer in the presence of a reaction product with an acid anhydride group of a substance.

[Comb-shaped resin-type dispersant (S2)]
The comb-shaped acidic resin-type dispersant (S2) is produced by a known method such as WO2008 / 007776, JP-A-2009-155406, JP-A-2010-185934, JP-A-2011-157416, etc. can do.
For example, it has a hydroxyl group, a t-butyl group, an oxetane skeleton, a thermally crosslinked group such as a blocked isocyanate, in the presence of a reaction product of a hydroxyl group of a compound having a hydroxyl group and an acid anhydride group of tetracarboxylic acid dianhydride. A resin-type dispersant obtained by reacting an ethylenically unsaturated monomer and a resin-type dispersant having a side chain obtained by polymerizing other than that with a tylene-unsaturated monomer having an isocyanate group at the hydroxyl group of the side chain. Can be mentioned.

Further, in the present invention, the following dispersants may be used.
[Other resin type dispersants]
The resin-type dispersant has a colorant-affinitive moiety having a property of adsorbing to the additive colorant and a moiety compatible with the colorant carrier, and is adsorbed by the additive colorant to the colorant carrier. Any substance may be used as long as it has a function of stabilizing dispersion, and specifically, polycarboxylic acid esters such as polyurethane and polyacrylate, unsaturated polyamides, polycarboxylic acids, and polycarboxylic acids, including those overlapping with the above. (Partial) With amine salt, polycarboxylic acid ammonium salt, polycarboxylic acid alkylamine salt, polysiloxane, long-chain polyaminoamide phosphate, hydroxyl group-containing polycarboxylic acid ester, modified products thereof, and poly (lower alkyleneimine). Oily dispersants such as amides and salts thereof formed by reaction with polyester having a free carboxyl group, (meth) acrylic acid-styrene copolymer, (meth) acrylic acid- (meth) acrylic acid ester copolymer , Styrene-maleic acid copolymer, water-soluble resin such as polyvinyl alcohol, polyvinylpyrrolidone, water-soluble polymer compound, polyester type, modified polyacrylate type, ethylene oxide / propylene oxide addition compound, phosphoric acid ester type, etc. These are used alone or in admixture of two or more.
Examples of the polymer dispersant having a basic functional group include a nitrogen atom-containing graft copolymer and a nitrogen atom-containing functional group having a functional group containing a tertiary amino group, a quaternary ammonium base, a nitrogen-containing heterocycle, etc. in the side chain. Examples thereof include acrylic block copolymers and urethane polymer dispersants.

Examples of commercially available resin-type dispersants include Disperbyk-101, 103, 107, 108, 116, 130, 140, 154, 161, 162, 163, 164, 165, 166, 167, 168, manufactured by Big Chemie Japan. 170, 171, 180, 181, 182, 183, 184, 185, 190, 2000, 2001, 2009, 2010, 2020, 2025, 2050, 2070, 2095, 2150, 2155, 2163, 2164 or Anti-Terra-U, 203, 204, or BYK-P104, P104S, 220S, LPN6919, or Lactimon, Lactimon-WS or Bykumen, etc. 17000, 18000, 20000, 21000, 24000, 26000, 27000, 28000, 31845, 32000, 32500, 32550, 33500, 32600, 34750, 35100, 36600, 38500, 41000, 41090, 53095, 55000, 56000, 76500, etc., BASF EFKA-46, 47, 48, 452, 4008, 4009, 4010, 4015, 4020, 4047, 4050, 4055, 4060, 4080, 4400, 4401, 4402, 4403, 4406, 4408, 4300, 4310, manufactured by Japan. 4320, 4330, 4340, 450, 451, 453, 4540, 4550, 4560, 4800, 5010, 5065, 5066, 5070, 7500, 7554, 1101, 120, 150, 1501, 1502, 1503, etc., manufactured by Ajinomoto Fine Techno. Ajispa-PA111, PB711, PB821, PB822, PB824 and the like can be mentioned.

The content of the resin type dispersant (B) is preferably 5 to 200 parts by mass with respect to the total amount of the colorant (A), and more preferably 10 to 100 parts by mass from the viewpoint of film forming property.

<Dye derivative (f)>
In the present invention, it is preferable to use a dye derivative from the viewpoint of agglomerated foreign matter. As the dye derivative (f) used in the present invention, a dye derivative in which a functional group is introduced into the dye matrix skeleton which is an organic dye residue can be used. These can be classified into acidic, basic and neutral according to the chemical structure of the functional group introduced into the dye matrix skeleton. For example, examples of the acidic dye derivative include compounds having an acidic substituent such as a sulfo group, a carboxy group, and a phosphoric acid group, and amine salts thereof. Examples of the basic dye derivative include a compound having a basic substituent such as a sulfonamide group or a tertiary amino group at the terminal. Examples of the neutral dye derivative include compounds having a neutral substituent such as a phenyl group and a phthalimide alkyl group.
Examples of the dye matrix skeleton which is an organic dye residue include diketopyrrolopyrrole pigments, phthalocyanine pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, perinone pigments, perylene pigments, and thiazine indigo pigments. Triazine pigments, benzimidazolone pigments, indol pigments such as benzoisoindole, isoindolin pigments, isoindolinone pigments, quinophthalone pigments, naphthol pigments, slene pigments, metal complex pigments, azo, disazo , Azo pigments such as polyazo, and the like. Among them, a phthalocyanine-based maternal skeleton is more preferable from the viewpoint of suppressing the generation of foreign substances over time.
Specifically, as the diketopyrrolopyrrole dye derivative, JP-A-2001-22520, WO2009 / 081930 pamphlet, WO2011 / 052617 pamphlet, WO2012 / 102399 pamphlet, JP-A-2017-156397, phthalocyanine. Examples of the dye derivative are JP-A-2007-226161, WO2016 / 163351, JP-A-2017-165820, and Patent No. 5735266. Japanese Patent Application Laid-Open No. 09-272812, Japanese Patent Application Laid-Open No. 10-245501, Japanese Patent Application Laid-Open No. 10-265697, Japanese Patent Application Laid-Open No. 2007-079094, WO2009 / 025325 pamphlet, as a quinacridone-based dye derivative, JP-A-48- JP-A-54128, JP-A-03-9961, JP-A-2000-273383, JP-A-2011-162662 as a dioxazine-based dye derivative, and JP-A-2007-314785 as a thiazineindigo-based dye derivative. Examples of JP / Triazine-based dye derivatives include JP-A-61-246261, JP-A-11-199796, JP-A-2003-165922, JP-A-2003-168208, and JP-A-2004-217842. JP-A-2007-314681, JP-A-2009-57478 for benzoisoindole-based dye derivatives, JP-A-2003-167112 for quinophthalone-based dye derivatives, JP-A-2006-291194, JP-A. 2008-31281, 2012-226110, naphthol-based dye derivatives, 2012-208329, 2014-5439, and azo-based dye derivatives, 2001-172520. Japanese Unexamined Patent Publication No. 2012-172092, JP-A-2004-307854 as acidic substituents, JP-A-2002-201377, JP-A-2003-171594, JP-A-2005 as basic substituents. Examples thereof include known dye derivatives described in JP-A-181383, JP-A-2005-213404, and the like. In these documents, the dye derivative may be described as a derivative, a pigment derivative, a dispersant, a pigment dispersant, or simply a compound. A compound having a substituent such as a basic group or a neutral group is synonymous with a dye derivative.
The dye derivative may be used alone or in combination of two or more.

The content of the dye derivative (f) is preferably 1 to 50 parts by mass, more preferably 1 to 45 parts by mass, and 1 to 40 parts by mass with respect to 100 parts by mass of the colorant. Is even more preferable.

<Pigment miniaturization>
When the colorant used in the infrared transmissive coloring composition of the present invention is a pigment, it is preferable to use it in a finely divided form from the viewpoint of transmittance in the infrared region. The miniaturization method is not particularly limited, and examples thereof include wet grinding, dry grinding, and dissolution precipitation method. Among these, the salt milling treatment by the kneader method, which is one of the wet grinding methods, is preferable. The average primary particle size determined by the TEM (transmission electron microscope) of the pigment is preferably 5 to 90 nm, more preferably 10 to 70 nm. Having an appropriate particle size improves the dispersibility and further improves the contrast ratio.

The salt milling treatment is a batch type or continuous type of a mixture of a pigment, a water-soluble inorganic salt and a water-soluble organic solvent, such as a kneader, a 2-roll mill, a 3-roll mill, a ball mill, an attritor, a sand mill, and a planetary mixer. This is a treatment in which a water-soluble inorganic salt and a water-soluble organic solvent are removed by washing with water after mechanically kneading while heating using a kneader. The water-soluble inorganic salt acts as a crushing aid, and the pigment is crushed by utilizing the high hardness of the inorganic salt during salt milling. By optimizing the conditions for the salt milling treatment of the pigment, it is possible to obtain a pigment having a very fine primary particle size, a narrow distribution width, and a sharp particle size distribution.

Examples of the water-soluble inorganic salt include sodium chloride, potassium chloride, sodium sulfate and the like. Of these, inexpensive sodium chloride (salt) is preferable. From the viewpoint of both treatment efficiency and production efficiency, the water-soluble inorganic salt is preferably used in an amount of 50 to 2000 parts by mass, more preferably 300 to 1000 parts by mass with respect to 100 parts by mass of the pigment.

The water-soluble organic solvent has a function of wetting the pigment and the water-soluble inorganic salt, and is not particularly limited as long as it dissolves (mixes) in water and does not substantially dissolve the inorganic salt used. However, since the temperature rises during salt milling and the solvent easily evaporates, a high boiling point solvent having a boiling point of 120 ° C. or higher is preferable from the viewpoint of safety. For example, 2-methoxyethanol, 2-butoxyethanol, 2- (isopentyloxy) ethanol, 2- (hexyloxy) ethanol, diethylene glycol, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, Liquid polyethylene glycol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, liquid polypropylene glycol and the like are used. The water-soluble organic solvent is preferably used in an amount of 5 to 1000 parts by mass, more preferably 50 to 500 parts by mass, based on 100 parts by mass of the pigment.

When the pigment is subjected to salt milling treatment, a resin may be added if necessary. The type of resin used is not particularly limited, and natural resins, modified natural resins, synthetic resins, synthetic resins modified with natural resins and the like can be used. The resin used is preferably solid at room temperature, water-insoluble, and more preferably partially soluble in the organic solvent. The amount of the resin used is preferably 5 to 200 parts by mass with respect to 100 parts by mass of the pigment.

<Binder resin (C)>
In the present invention, a binder resin is used in combination in order to impart functions such as developability to the dispersion. The binder resin is a compound necessary for forming a film. Examples of the binder resin include a thermoplastic resin, a thermosetting resin, and an active energy ray-curable resin having an ethylenically unsaturated double bond. It is also preferable that the active energy ray-curable resin has thermosetting property. The binder resin is preferably an alkali-soluble resin from the viewpoint of developability.

The content of the binder resin in the infrared transmissive coloring composition of the present invention is preferably 1 to 100 parts by mass, more preferably 1 to 40 parts by mass with respect to 100 parts by mass of the colorant (A). When an appropriate amount is contained, film formation is facilitated and good color characteristics are easily obtained.

Examples of the thermoplastic resin include acrylic resin, butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, and polyurethane resin. , Polyester resin, vinyl resin, alkyd resin, polystyrene resin, polyamide resin, rubber resin, cyclized rubber resin, celluloses, polyethylene (HDPE, LDPE), polybutadiene, polyimide resin and the like.

Examples of the thermosetting resin include epoxy resin, benzoguanamine resin, rosin-modified maleic acid resin, rosin-modified fumaric acid resin, melamine resin, urea resin, and phenol resin.

The binder resin is preferably a resin having a spectral transmittance of preferably 80% or more, more preferably 95% or more in the entire wavelength region of 400 to 700 nm in the visible light region.

The alkali-soluble resin is a resin having an acidic group such as a carboxyl group and a sulfone group. The alkali-soluble resin may be, for example, an acrylic resin having an acidic group, an α-olefin / (maleic) maleic anhydride copolymer, a styrene / styrene sulfonic acid copolymer, an ethylene / (meth) acrylic acid copolymer, or an isobutylene /. (Anhydrous) maleic anhydride copolymer and the like can be mentioned. Among these, an acrylic resin having an acidic group and a styrene / styrene sulfonic acid copolymer, which further improve heat resistance and transparency, are preferable, and an acrylic resin having an acidic group is more preferable.

An active energy ray-curable resin having an ethylenically unsaturated active double bond can be used to impart photoreactivity to the alkali-soluble resin. As a result, the film after curing has further improved solvent resistance.

Examples of the active energy ray-curable resin having an ethylenically unsaturated double bond include resins having an unsaturated ethylenically double bond introduced by the methods (a) to (c) shown below.

[Method (a)]
As the method (a), for example, a side chain epoxy group of a copolymer obtained by copolymerizing an unsaturated ethylenic monomer having an epoxy group with one or more other monomers is used. , A carboxyl group of an unsaturated monobasic acid having an unsaturated ethylenic double bond is added and reacted, and a polybasic acid anhydride is reacted with the generated hydroxyl group to form an unsaturated ethylenically double bond and a carboxyl group. There is a way to introduce it.

Examples of the unsaturated ethylenic monomer having an epoxy group include glycidyl (meth) acrylate, methylglycidyl (meth) acrylate, 2-glycidoxyethyl (meth) acrylate, and 3,4 epoxybutyl (meth) acrylate. And 3,4 epoxycyclohexyl (meth) acrylates, which may be used alone or in combination of two or more. From the viewpoint of reactivity with unsaturated monobasic acid in the next step, glycidyl (meth) acrylate is preferable.

Examples of the unsaturated monobasic acid include (meth) acrylic acid, crotonic acid, o-, m-, p-vinylbenzoic acid, α-position haloalkyl of (meth) acrylic acid, alkoxyl, halogen, nitro, and cyano-substituted products. Examples thereof include monocarboxylic acids, which may be used alone or in combination of two or more.

Examples of the polybasic acid anhydride include tetrahydrophthalic anhydride, phthalic anhydride, hexahydrophthalic anhydride, succinic anhydride, maleic anhydride and the like, and these may be used alone or in combination of two or more. It doesn't matter. If necessary, such as by increasing the number of carboxyl groups, use tricarboxylic acid anhydride such as trimellitic acid anhydride or tetracarboxylic acid dianhydride such as pyromellitic acid dianhydride to obtain the remaining anhydride. The group can also be hydrolyzed. Further, when tetrahydrophthalic anhydride or maleic anhydride having an unsaturated ethylenic double bond is used as the polybasic acid anhydride, the unsaturated ethylenic double bond can be further increased.

[Method (b)]
As a method similar to the method (a), for example, a side chain of a copolymer obtained by copolymerizing an unsaturated ethylenic monomer having a carboxyl group with one or more other monomers. There is a method of adding an unsaturated ethylenic monomer having an epoxy group to a part of the carboxyl group to introduce an unsaturated ethylenic double bond and a carboxyl group.
In this method, more hydroxyl groups derived from unsaturated ethylenic monomers having an epoxy group are generated as compared with the method (a). When the resin having a cationic group in the side chain used to obtain the salt-forming compound of the present invention contains an oxetanyl group or a t-butyl group as a thermally crosslinkable functional group, the method as a binder resin ( It is preferable to use the resin obtained in b) because it exhibits higher heat resistance.

[Method (c)]
As the method (c), an unsaturated ethylenic monomer having a hydroxyl group is used, and a monomer of an unsaturated monobasic acid having another carboxyl group or another monomer is copolymerized with the monomer. There is a method of reacting the side chain hydroxyl group of the obtained copolymer with the isocyanate group of the unsaturated ethylenic monomer having an isocyanate group.

Examples of the unsaturated ethylenic monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2- or 3-hydroxypropyl (meth) acrylate, 2- or 3- or 4-hydroxybutyl (meth) acrylate, and glycerol. Examples thereof include hydroxyalkyl (meth) acrylates such as (meth) acrylate and cyclohexanedimethanol mono (meth) acrylate, and these may be used alone or in combination of two or more. Further, a polyether mono (meth) acrylate obtained by superpolymerizing the above hydroxyalkyl (meth) acrylate with ethylene oxide, propylene oxide, and / or butylene oxide, (poly) γ-valerolactone, and (poly) ε-caprolactone. , And / or (poly) ester mono (meth) acrylates to which (poly) 12-hydroxystearic acid and the like are added can also be used. 2-Hydroxyethyl (meth) acrylate or glycerol (meth) acrylate is preferable from the viewpoint of suppressing foreign matter in the coating film.

Examples of the unsaturated ethylenic monomer having an isocyanate group include 2- (meth) acryloyloxyethyl isocyanate and 1,1-bis [(meth) acryloyloxy] ethyl isocyanate, but the present invention is limited thereto. However, two or more types can be used together.

The mass average molecular weight (Mw) of the binder resin is preferably in the range of 10,000 to 100,000, more preferably in the range of 10,000 to 80,000 from the viewpoint of film forming property and coating film resistance. The number average molecular weight (Mn) is preferably in the range of 5,000 to 50,000, and the value of Mw / Mn is preferably 10 or less.

When the binder resin is used as a photosensitive composition, it is preferable to use a resin having an acid value of 20 to 300 mgKOH / g from the viewpoint of dispersibility, permeability, developability, and heat resistance of the pigment and the salt-forming compound. If the acid value is less than 20 mgKOH / g, the solubility in a developing solution is poor and it is difficult to form a fine pattern. If it exceeds 300 mgKOH / g, fine patterns may not remain.

Since the binder resin has good film forming properties and various resistances, it is preferable to use the binder resin in an amount of 30 parts by mass or more with respect to 100 parts by mass of the colorant (A), and the colorant concentration is high and good color characteristics are obtained. Since it can be expressed, it is preferably used in an amount of 500 parts by mass or less.

(Thermosetting compound)
In the present invention, a thermosetting compound may be further contained. Thermosetting compounds include, for example, epoxy compounds and / or resins, oxetane compounds and / or resins, benzoguanamine compounds and / or resins, rosin-modified maleic acid compounds and / or resins, rosin-modified fumaric acid compounds and / or resins. Examples include melamine compounds and / or resins, urea compounds and / or resins, phenolic compounds and / or resins.

<Organic solvent>
The organic solvent assists in the dispersion of the colorant and can appropriately adjust the viscosity of the coloring composition.
Examples of the organic solvent include ethyl lactate, benzyl alcohol, 1,3-butanediol, 1,3-butylene glycol, 1,3-butylene glycol diacetate, 1,4-dioxane, 2-heptanone, and 2-methyl-. 1,3-Propanediol, 3,5,5-trimethyl-2-cyclohexene-1-one, 3,3,5-trimethylcyclohexanone, ethyl 3-ethoxypropionate, 3-methyl-1,3-butanediol, 3-methoxy-3-methyl-1-butanol, 3-methoxy-3-methylbutyl acetate, 3-methoxybutanol, 3-methoxybutyl acetate, 4-heptanone, m-xylene, m-diethylbenzene, N, N-dimethyl Acetamide, N, N-dimethylformamide, n-butyl alcohol, n-butylbenzene, n-propylacetate, o-xylene, o-diethylbenzene, p-diethylbenzene, sec-butylbenzene, tert-butylbenzene, γ-butyrolactone, Isobutyl Alcohol, Isophoron, Ethylene Glycol Diethyl Ether, Ethylene Glycol Dibutyl Ether, Ethylene Glycol Monoisopropyl Ether, Ethylene Glycol Monoethyl Ether, Ethylene Glycol Monoethyl Ether Acetate, Ethylene Glycol Monotershary Butyl Ether, Ethylene Glycol Monobutyl Ether, Ethylene Glycol Monobutyl Ether Acetate, Ethylene Glycol Monopropyl Ether, Ethylene Glycol Monohexyl Ether, Ethylene Glycol Monomethyl Ether, Ethylene Glycol Monomethyl Ether Acetate, Diisobutyl Ketone, Diethylene Glycol Diethyl Ether, Diethylene Glycol Diethyl Ether, Diethylene Glycol Monoisopropyl Ether, Diethylene Glycol Monoethyl Ether Acetate, Diethylene Glycol Monobutyl Ether, Diethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether, cyclohexanol, cyclohexanol acetate, cyclohexanone, dipropylene glycol dimethyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, dipropylene glycol monopropyl ether, Dipropylene glycol mono Methyl ether, diacetone alcohol, triacetin, tripropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, propylene glycol diacetate, propylene glycol phenyl ether, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether, propylene Glycol monopropyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether propionate, benzyl alcohol, methyl isobutyl ketone, methyl cyclohexanol, n-amyl acetate, n-butyl acetate, isoamyl acetate, isobutyl acetate , Propyl acetate, dibasic acid ester and the like.

Among them, ethyl lactate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether acetate, and ethylene glycol monoethyl have good dispersibility, permeability, and coatability of the coloring composition. It is preferable to use glycol acetates such as ether acetate, alcohols such as benzyl alcohol, diacetone alcohol and 3-methoxybutanol, and ketones such as cyclohexanone.

The organic solvent can be used alone or in combination of two or more.

Further, since the organic solvent can adjust the coloring composition to an appropriate viscosity and form a coloring film having a desired uniform film thickness, 500 to 4,000 parts by mass with respect to 100 parts by mass of the colorant (A). It is preferable to use it in the amount of.

<Photopolymerizable monomer>
The infrared transmissive coloring composition of the present invention can be used as an infrared transmissive photosensitive coloring composition by further adding a photopolymerizable monomer and / or a photopolymerization initiator. The photopolymerizable monomer that may be added to the infrared transmissive coloring composition of the present invention includes a monomer or an oligomer that is cured by ultraviolet rays, heat, or the like to produce a transparent resin.

Examples of the monomer and oligomer that cure with ultraviolet rays or heat to produce a transparent resin include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate. , Cyclohexyl (meth) acrylate, β-carboxyethyl (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di ( Meta) Acrylate, Trimethylol Propanetri (Meta) Acrylate, Pentaerythritol Tri (Meta) Acrylate, Pentaerythritol Tetra (Meta) Acrylate, 1,6-Hexanediol Diglycidyl Ether Di (Meta) Acrylate, Bisphenol A Diglycidyl Ether Di (Meta) acrylate, neopentyl glycol diglycidyl ether di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, tricyclodecanyl (meth) acrylate, ester acrylate, methylolated melamine (Meta) acrylic acid ester, epoxy (meth) acrylate, various acrylic acid esters such as urethane acrylate and methacrylic acid ester, (meth) acrylic acid, styrene, vinyl acetate, hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol tri Examples thereof include, but are not limited to, vinyl ether, (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-vinylformamide, and acrylonitrile.

The photopolymerizable compound can be used alone or in combination of two or more.

The content of the photopolymerizable monomer is preferably 5 to 400 parts by mass, more preferably 10 to 300 parts by mass with respect to 100 parts by mass of the colorant (A). When an appropriate amount is blended, the photocurability and developability are further improved.

<Photopolymerization initiator>
The infrared transmissive coloring composition of the present invention may contain a photopolymerization initiator. This facilitates photocuring when the filter segments are formed by the photolithography method. The blending amount of the photopolymerization initiator is preferably 5 to 200% by mass, more preferably 10 to 150% by mass, based on 100 parts by mass of the colorant (A). When an appropriate amount is blended, the photocurability and developability are further improved.

The photopolymerization initiator is, for example, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropane-1-one, 1 -Hydroxycyclohexylphenylketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, 2- (dimethylamino) -2-[(4-methylphenyl) methyl]- Acetphenone compounds such as 1- [4- (4-morpholinyl) phenyl] -1-butanone or 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butane-1-one; benzoin, Benzoin compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, or benzyl dimethyl ketal; benzophenone, benzoyl benzoic acid, methyl benzoyl benzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylicized benzophenone, 4-benzoyl-4 Benzophenone compounds such as'-methyldiphenylsulfide or 3,3', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone; thioxanthone, 2-chlorthioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2, Thioxanthone compounds such as 4-diisopropylthioxanthone or 2,4-diethylthioxanthone; 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (P-Methenylphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4,6 -Bis (trichloromethyl) -s-triazine, 2,4-bis (trichloromethyl) -6-styryl-s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) -s -Triazine, 2- (4-methoxy-naphtho-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, or 2,4 -Triazine compounds such as trichloromethyl- (4'-methoxystyryl) -6-triazine; 1- (N-4-benzoylphenyl-carbazole-3-yl) -butane-1 , 2-dione-2-oxime-O-acetate, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], etanone, 1- [9-ethyl-6 -(2-Methylbenzoyl) -9H-carbazole-3-yl]-, 1- (0-acetyloxime), or O- (acetyl) -N- (1-phenyl-2-oxo-2- (4') -Oxime ester compounds such as methoxy-naphthyl) ethylidene) hydroxylamine; phosphinid compounds such as bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide or 2,4,6-trimethylbenzoyldiphenylphosphine oxide; 9 , 10-Phenanthrene quinone, camphorquinone, ethylanthraquinone and other quinone compounds; borate compounds; carbazole compounds; imidazole compounds; or titanosen compounds are used.

The photopolymerization initiator can be used alone or in combination of two or more.

The content of the photopolymerization initiator is preferably 5 to 200% by mass, more preferably 10 to 150% by mass, based on 100 parts by mass of the colorant (A). When used in an appropriate amount, the photocurability and developability are further improved.

<Sensitizer>
In the infrared transmissive coloring composition of the present invention, a photopolymerization initiator and a sensitizer can be used in combination.
Examples of the sensitizer include unsaturated ketones such as chalcone derivatives and dibenzalacetone, 1,2-diketone derivatives such as benzyl and camphorquinone, benzoin derivatives, fluorene derivatives, naphthoquinone derivatives and anthraquinone. Polymethine dyes such as derivatives, xanthene derivatives, thioxanthene derivatives, xanthone derivatives, thioxanthone derivatives, coumarin derivatives, ketocoumarin derivatives, cyanine derivatives, merocyanine derivatives, oxonoal derivatives, aclysine derivatives, azine derivatives, thiadine derivatives, oxadin derivatives, indolin derivatives. , Azulene derivative, Azurenium derivative, Squalylium derivative, Porphyrin derivative, Tetraphenylporphyrin derivative, Triphenylmethane derivative, Tetrabenzoporphyrin derivative, Tetrapyrazinoporphyrazine derivative, Phthalocyanin derivative, Tetraazaporphyrazine derivative, Tetraquinoxalyloporphyrazine Derivatives, naphthalocyanine derivatives, subphthalocyanine derivatives, pyrylium derivatives, thiopyrilium derivatives, tetraphyllin derivatives, anurene derivatives, spiropyrane derivatives, spiroxazine derivatives, thiospiropyrane derivatives, metal arene complexes, organic ruthenium complexes, or Michler ketone derivatives, α-acyloxy Esters, acylphosphine oxides, methylphenylgrioxylates, benzyls, 9,10-phenanslenquinone, camphorquinone, ethylanthraquinone, 4,4'-diethylisophthalofenone, 3,3'or 4,4' -Tetra (t-butylperoxycarbonyl) benzophenone, 4,4'-diethylaminobenzophenone and the like can be mentioned.

The sensitizer can be used alone or in combination of two or more.

The amount of the sensitizer used is preferably 3 to 60% by mass, more preferably 5 to 50% by mass, based on 100 parts by mass of the photopolymerization initiator. When used in an appropriate amount, photocurability and developability are further improved.

<Amine compounds>
The infrared transmissive coloring composition of the present invention can contain an amine compound. Amine compounds can reduce dissolved oxygen.

Amine-based compounds include, for example, triethanolamine, methyldiethanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 2-dimethylaminoethyl benzoate, and the like. 2-Ethylhexyl 4-dimethylaminobenzoate, N, N-dimethylparatoluidine and the like can be mentioned.

<Leveling agent>
The infrared transmissive coloring composition of the present invention may contain a leveling agent. As a result, the coatability is further improved, and the surface smoothness of the coating film is further improved.
Examples of the leveling agent include, in addition to dimethylsiloxane, various surfactants such as silicone-based surfactants, fluorine-based surfactants, nonionic surfactants, and cationic-based (surfactants, anionic surfactants, etc.). ..
The dimethylsiloxane is preferably dimethylsiloxane having a polyether structure and / or a polyester structure in the main chain. Commercially available products of dimethylsiloxane having a polyether structure in the main chain are FZ-2110, FZ-2122, FZ-2130, FZ-2166, FZ-2191, FZ-2203, FZ-2207, and Big Chemie manufactured by Toray Dow Corning. Examples include BYK-333 manufactured by the company. Examples of commercially available products of dimethylsiloxane having a polyester structure in the main chain include BYK-310 and BYK-370 manufactured by Big Chemie.

Anionic surfactants include polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium alkylnaphthalinsulfonate, sodium alkyldiphenyl ether disulfonate, monoethanolamine lauryl sulfate, and so on. Examples thereof include triethanolamine lauryl sulfate, ammonium lauryl sulfate, monoethanolamine stearate, sodium stearate, sodium lauryl sulfate, monoethanolamine of styrene-acrylic acid copolymer, and polyoxyethylene alkyl ether phosphate ester.

Examples of the chaotic surfactant include alkyl quaternary ammonium salts and ethylene oxide adducts thereof. Nonionic surfactants to be added as an auxiliary to the leveling agent include polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene alkyl ether phosphoric acid ester, and polyoxyethylene sorbitan monostearate. , Polyethylene glycol monolaurate and the like; alkyl betaines such as alkyldimethylaminoacetic acid betaine, amphoteric surfactants such as alkylimidazolin, and fluorocarbon and silicone-based surfactants.

The leveling agent can be used alone or in combination of two or more.

The content of the leveling agent is preferably 0.003 to 0.5% by mass in 100% by mass of the coloring composition.

<Epoxy compound>
The infrared transmissive coloring composition of the present invention can contain an epoxy compound.

Examples of the epoxy compound include phenol novolac type epoxy resin, cresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, dicyclopentadienephenol type epoxy resin, bisphenol-A type epoxy resin, bisphenol-F type epoxy resin, and biphenol. Examples thereof include a type epoxy resin, a bisphenol-A novolak type epoxy resin, a naphthalene skeleton-containing epoxy resin, an alicyclic epoxy resin, and a heterocyclic epoxy resin.

Commercially available products of the phenol novolac type epoxy resin include, for example, Epicron N-740, Epicron N-770, Epicron N-775 manufactured by DIC Corporation, and D.D. Co., Ltd. manufactured by Dow Chemical Corporation. E. Examples thereof include N438, RE-306 manufactured by Nippon Kayaku Co., Ltd., jER152 manufactured by Mitsubishi Chemical Corporation, and jER154 manufactured by Mitsubishi Chemical Corporation.

Commercially available cresol novolak type epoxy resins include Epicron N-660, Epicron N-665, Epicron N-670, Epicron N-673, Epicron N-680, Epicron N-695, Epicron N-665-EXP, manufactured by DIC Corporation. Examples thereof include Epicron N-672-EXP, EOCN-102S manufactured by Nippon Kayaku Co., Ltd., EOCN-103S, EOCN-104S, UVR-6650 manufactured by Union Carbide, and ESCN-195 manufactured by Sumitomo Chemical Co., Ltd.

Examples of commercially available products of the trishydroxyphenylmethane type epoxy resin include EPPN-503, EPPN-502H, EPPN-501H manufactured by Nippon Kayaku Corporation, TACTIX-742 manufactured by Dow Chemical Corporation, and jER E1032H60 manufactured by Mitsubishi Chemical Corporation.

Examples of commercially available dicyclopentadiene phenol type epoxy resins include Epicron EXA-7200 manufactured by DIC Corporation and TACTIX-556 manufactured by Dow Chemical Corporation.

Commercially available bisphenol type epoxy resins include jER828 and jER1001 manufactured by Mitsubishi Chemical Corporation, UVR-6410 manufactured by Union Carbide, and D.D. E. R-331, bisphenol-A type epoxy resin such as YD-8125 manufactured by Shin Nikka Epoxy Mfg. Co., Ltd., UVR-6490 manufactured by Union Carbide, bisphenol-F type epoxy resin such as YDF-8170 manufactured by Shin Nikka Epoxy Mfg. Co., Ltd., etc. Can be mentioned.

Commercially available products of biphenol type epoxy resin include biphenol type epoxy resin such as NC-3000 and NC-3000H manufactured by Nippon Kayaku Corporation, and bixylenol type epoxy resin such as jER YX-4000 and jER YL-6121 manufactured by Mitsubishi Chemical Corporation. Can be mentioned.

Examples of commercially available bisphenol A novolak type epoxy resins include Epicron N-880 manufactured by DIC Corporation and jER E157S75 manufactured by Mitsubishi Chemical Corporation.

Examples of commercially available products of the naphthalene skeleton-containing epoxy resin include NC-77000 and NC-7300 manufactured by Nippon Kayaku Co., Ltd. and EXA-4750 manufactured by DIC Corporation.

Examples of commercially available alicyclic epoxy resins include Daicel's Seikiside 2021P, 2081, 2000, Epolide PB3600, PB4700, GT401, EHPE-3150, and Cyclomer M100.

Examples of commercially available products of the heterocyclic epoxy resin include TEPIC-L, TEPIC-H, and TEPIC-S manufactured by Nissan Chemical Industries, Ltd.

The epoxy compound can be used alone or in combination of two or more.

The content of the epoxy compound is preferably 0.5 to 50% by mass, more preferably 1 to 40% by mass, based on 100% by mass of the non-volatile content of the infrared transmissive coloring composition. When an appropriate amount is contained, the heat resistance is further improved.

<Oxetane compound>
The infrared transmissive coloring composition of the present invention can contain an oxetane compound. Examples of the oxetane compound include compounds having an oxetane group monofunctional, bifunctional, and trifunctional or higher.

Compounds with a monofunctional oxetane group include, for example, (3-ethyloxetane-3-yl) methyl acrylate, (3-ethyloxetane-3-yl) methylmethacrylate, 3-ethyl-3-hydroxymethyloxetane, 3-ethyl. -3- (2-Ethylhexyloxymethyl) oxetane, 3-ethyl-3- (phenoxymethyl) oxetane, 3-ethyl-3- (2-methacryloxymethyl) oxetane, 3-ethyl-3-{[3-] (Triethoxysilyl) propoxy] methyl} oxetane and the like. Examples of commercially available products include OXE-10 manufactured by Osaka Organic Chemical Industry Co., Ltd., OXT-101 and 212 manufactured by Toagosei Co., Ltd.

Compounds having a bifunctional oxetane group include, for example, 4,4'-bis [(3-ethyl-3-oxetanyl) methoxymethyl] biphenyl) and 1,4-bis [(3-ethyl-3-oxetanyl) methoxymethyl). ] Benzene, 1,4-bis {[(3-ethyl-3-oxetanyl) methoxy] methyl} benzene, di [1-ethyl (3-oxetanyl)] methyl ether, di [1-ethyl (3-oxetanyl)] Methyl ether-3-ethyl-3-hydroxymethyloxetane, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, 3-ethyl-3- (2-phenoxymethyl) oxetane, 3,7-bis (3) -Oxetanyl) -5-oxa-nonane, 1,2-bis [(3-ethyl-3-oxetanylmethoxy) methyl] ether, 1,3-bis [(3-ethyl-3-oxetanylmethoxy) methyl] propane, Ethylene glycosbis (3-ethyl-3-oxetanylmethyl) ether, dicyclopentenylbis (3-ethyl-3-oxetanylmethyl) ether, triethylene glycol bis (3-ethyl-3-oxetanylmethyl) ether, tetraethylene glycol Bis (3-ethyl-3-oxetanylmethyl) ether, 1,4-bis (3-ethyl-3-oxetanylmethoxy) butane, 1,6-bis (3-ethyl-3-oxetanylmethoxy) hexane, polyethylene glycol bis (3-Ethyl-3-oxetanylmethyl) ether, ethylene oxide (EO) modified bisphenol A bis (3-ethyl-3-oxetanylmethyl) ether, propylene oxide (PO) modified bisphenol A bis (3-ethyl-3-oxetanylmethyl) ) Ether, EO-modified hydrogenated bisphenol A bis (3-ethyl-3-oxetanylmethyl) ether, PO-modified hydrogenated bisphenol A-bis (3-ethyl-3-oxetanylmethyl) ether, EO-modified bisphenol F (3-ethyl-) 3-oxetanylmethyl) ether and the like can be mentioned. Examples of commercially available products include OXBP and OXTP manufactured by Ube Kosan Co., Ltd., OXT-121 and OXT-221 manufactured by Toagosei Co., Ltd.

Compounds having a trifunctional or higher oxetane group include, for example, pentaerythritol tris (3-ethyl-3-oxetanylmethyl) ether, pentaerythritol tetrakis (3-ethyl-3-oxetanylmethyl) ether, and dipentaerythritol hexa (3-ethyl). -3-oxetanylmethyl) ether, dipentaerythritol pentax (3-ethyl-3-oxetanylmethyl) ether, dipentaerythritol tetrakis (3-ethyl-3-oxetanylmethyl) ether, caprolactone-modified dipentaerythritol hexa (3-) Ethyl-3-oxetanylmethyl) ether, caprolactone-modified dipentaerythritol pentaxe (3-ethyl-3-oxetanylmethyl) ether, ditrimethylolpropanetetrakis (3-ethyl-3-oxetanylmethyl) ether, resin containing oxetane group Examples thereof include polymers obtained by radically polymerizing a (meth) acrylic monomer such as (for example, the oxetane-modified phenol novolac resin described in Patent No. 3783462) and the above-mentioned OXE-30.

The oxetane compound can be used alone or in combination of two or more.

The content of the oxetane compound is preferably 0.5 to 50% by mass, more preferably 1 to 40% by mass, based on 100% by mass of the non-volatile content of the coloring composition. When an appropriate amount is contained, the heat resistance is further improved.

<Curing agent, curing accelerator>
The infrared transmissive coloring composition of the present invention can contain a curing agent and a curing accelerator in order to assist the curing of the thermosetting resin.
Examples of the curing agent include phenolic resins, amine-based compounds, acid anhydrides, active esters, carboxylic acid-based compounds, and sulfonic acid-based compounds. Among these, a compound having two or more phenolic hydroxyl groups in one molecule and an amine-based curing agent are preferable.
The curing accelerator is, for example, an amine compound (for example, dicyandiamide, benzyldimethylamine, 4- (dimethylamino) -N, N-dimethylbenzylamine, 4-methoxy-N, N-dimethylbenzylamine, 4-methyl-N. , N-dimethylbenzylamine, etc.), quaternary ammonium salt compounds (eg, triethylbenzylammonium chloride, etc.), blocked isocyanate compounds (eg, dimethylamine, etc.), imidazole derivative bicyclic amidin compounds and salts thereof (eg, imidazole, etc.) 2-Methylimidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 4-phenylimidazole, 1-cyanoethyl-2-phenylimidazole, 1- (2-cyanoethyl) -2-ethyl- 4-Methylimidazole, etc.), phosphorus compounds (eg, triphenylphosphine, etc.), guanamine compounds (eg, melamine, guanamine, acetoguanamine, benzoguanamine, etc.), S-triazine derivatives (eg, 2,4-diamino-6-methacryloyl). Oxyethyl-S-triazine, 2-vinyl-2,4-diamino-S-triazine, 2-vinyl-4,6-diamino-S-triazine isocyanuric acid adduct, 2,4-diamino-6-methacryloyloxy Ethyl-S-triazine, isocyanuric acid adduct, etc.) and the like.

The curing agent and the curing accelerator can be used alone or in combination of two or more.

The amount of the curing agent and the curing accelerator used is preferably 0.01 to 15% by mass with respect to 100 parts by mass of the thermosetting resin, respectively.

<UV absorber>
The infrared transmissive coloring composition of the present invention may contain an ultraviolet absorber. Examples of the ultraviolet absorber include benzotriazole-based organic compounds, triazine-based organic compounds, benzophenone-based organic compounds, cyanoacrylate-based organic compounds, and salicylate-based organic compounds.

The content of the ultraviolet absorber is preferably 5 to 70% by mass based on 100% by mass of the total of the photopolymerization initiator and the ultraviolet absorber. Highly compatible with light sensitivity and resolution. When the coloring composition contains a sensitizer, the content of the photopolymerization initiator includes the content of the sensitizer.

The total content of the photopolymerization initiator and the ultraviolet absorber is preferably 1 to 20% by mass based on 100% by mass of the non-volatile content of the photosensitive coloring composition. If the total content of the photopolymerization initiator and the ultraviolet absorber is less than the above, the adhesion is weakened and pixel peeling occurs, and if it is more than the above, the sensitivity may be too high and the resolution may be deteriorated.

Examples of the benzotriazole-based organic compound include 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (2-hydroxy-5-t-butylphenyl) -2H-benzotriazole, and octyl-3 [3-tert. -Butyl-4-hydroxy-5- (5-chloro-2H-benzotriazole-2-yl) phenyl] propionate and 2-ethylhexyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro) -2H-Benzotriazole-2-yl) phenyl] propionate mixture, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3-t Butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-amyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'- t-octylphenyl) benzotriazole, 5% 2-methoxy-1-methylethyl acetate and 95% benzenepropanoic acid, 3- (2H-benzotriazole-2-yl)-(1,1-dimethylethyl)- 4-Hydroxy, C7-9 side chain and linear alkyl ester compounds, 2- (2H-benzotriazole-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol, 2- ( Examples thereof include 2H-benzotriazole-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol.

Commercially available products are BASF Japan's "TINUVIN P", "TINUVIN PS", "TINUVIN 109", "TINUVIN 234", "TINUVIN 326", "TINUVIN 328", "TINUVIN 329", "TINUVIN 360", "TINUVIN". 384-2 ”,“ TINUVIN 900 ”,“ TINUVIN 928 ”,“ TINUVIN 99-2 ”,“ TINUVIN 1130 ”,“ ADEKA STUB LA-29 ”manufactured by ADEKA,“ RUNA-93 ”manufactured by Otsuka Chemical Co., Ltd., etc. ..

The triazine-based organic compound is, for example, 2- [4,6-di (2,4-kisilyl) -1,3,5-triazine-2-yl] -5-octyloxyphenol 2- [4,6-]. Bis (2,4-dimethylphenyl) -1,3,5-triazine-2-yl] -5- [3- (dodecyloxy) -2-hydroxypropoxy] phenol, 2- (2,4-dihydroxyphenyl) Reaction product of -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine and (2-ethylhexyl-glycidate ester, 2,4-bis "2-hydroxy-4-butoxyphenyl" -6- (2,4-dibutoxyphenyl) -1,3-5-triazine and the like can be mentioned.

Commercially available products are "KEMISORB 102" manufactured by Chemipro Kasei, "TINUVIN 400", "TINUVIN 405", "TINUVIN 460", "TINUVIN 477-DW", "TINUVIN 479", "TINUVIN 1577", ADEKA manufactured by BASF Japan. Examples thereof include "ADEKA STAB LA-46" and "ADEKA STAB LA-F70" manufactured by Sun Chemical Co., Ltd. and "CYASORB UV-1164" manufactured by Sun Chemical Co., Ltd.

Benzophenone-based organic compounds include, for example, 2,4-di-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulphonic acid-3 water temperature, 2-hydroxy-4-n. -Octoxybenzophenone, 2,2-di-hydroxy-4-methoxybenzophenone and the like can be mentioned.

Commercially available products are "KEMISORB 10", "KEMISORB 11", "KEMISORB 11S", "KEMISORB 12", "KEMISORB 111" manufactured by Chemipro Kasei Co., Ltd., "SEESORB 101", "SEESORB 107" manufactured by ADEKA Corporation. "ADEKA STAB 1413" and the like can be mentioned.

<Thiol chain transfer agent>
The infrared transmissive coloring composition can contain a thiol-based chain transfer agent. When a thiol-based chain transfer agent is used together with a photopolymerization initiator, it acts as a chain transfer agent in the radical polymerization process after light irradiation, and generates chiyl radicals that are less susceptible to polymerization inhibition by oxygen, thus improving photosensitivity. As a result, the photocurability from the surface of the coating film to the deep part of the coating film is further improved.

Polyfunctional thiols include, for example, hexanedithiol, decandithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene glycol bisthioglycolate, ethylene glycol bisthiopropionate. , Trimethylolpropane Tristhioglycolate, Trimethylolpropane Tristhiopropionate, Trimethylolpropanetris (3-mercaptobutyrate), Pentaerythritol tetrakisthioglycolate, Pentaerythritol tetrakisthiopropionate, Tristrimercaptopropionate (2-Hydroxyethyl) isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto-s-triazine, 2- (N, N-dibutylamino) -4,6-dimercapto-s-triazine And the like, preferably ethylene glycol bisthiopropionate, trimethylolpropane tristhiopropionate, pentaerythritol tetrakisthiopropionate and the like.

The thiol chain transfer agent can be used alone or in combination of two or more.

The content of the thiol-based chain transfer agent is preferably 1 to 10%, more preferably 2 to 8%, based on 100% by mass of the non-volatile content of the infrared transmissive coloring composition. When used in an appropriate amount, the light sensitivity is improved and a film having a good shape can be obtained.

<Antioxidant>
The infrared transmissive coloring composition of the present invention may contain an antioxidant. The antioxidant can suppress the film formed from the infrared transmissive coloring composition from being oxidized and yellowed by a heating step such as thermosetting, and can maintain the transmittance of the film. In particular, when the colorant concentration of the photosensitive coloring composition is high, the cross-linking component is relatively small. Therefore, if measures such as using a highly sensitive cross-linking component or increasing the amount of the photopolymerization initiator are taken, yellowing of the thermal process will occur. This is to become stronger. Therefore, by containing an antioxidant, it is possible to prevent yellowing due to oxidation during the heating step and obtain a high transmittance of the coating film.

The "antioxidant" in the present invention may be any compound having an ultraviolet absorbing function, a radical catching function, or a peroxide decomposition function, and specifically, the antioxidant is a hindered phenolic or hindered amine type. , Phosphorus-based, sulfur-based, benzotriazole-based, benzophenone-based, hydroxylamine-based, sulcylic acid ester-based, and triazine-based compounds, and known ultraviolet absorbers, antioxidants, and the like can be used. Further, the antioxidant used in the present invention preferably does not contain a halogen atom.

Among these antioxidants, from the viewpoint of achieving both the transmittance and the sensitivity of the coating film, the preferred ones are hindered phenol-based antioxidants, hindered amine-based antioxidants, phosphorus-based antioxidants or sulfur-based antioxidants. Agents are mentioned.

Examples of the hindered phenolic antioxidant include 2,4-bis [(laurylthio) methyl] -o-cresol, 1,3,5-tris (3,5-di-t-butyl-4-hydroxybenzyl), and the like. 1,3,5-Tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl), 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di) -T-butylanilino) -1,3,5-triazine, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2,6-di-t-butyl-4- Nonylphenol, 2,2'-isobutylidene-bis- (4,6-dimethyl-phenol), 4,4'-butylidene-bis- (2-t-butyl-5-methylphenol), 2,2'-thio- Bis- (6-t-butyl-4-methylphenol), 2,5-di-t-amyl-hydroquinone, 2,2'thiodiethylbis- (3,5-di-t-butyl-4-hydroxyphenyl) )-Propionate, 1,1,3-tris- (2'-methyl-4'-hydroxy-5'-t-butylphenyl) -butane, 2,2'-methylene-bis- (6- (1-methyl) -Cyclohexyl) -p-cresol), 2,4-dimethyl-6- (1-methyl-cyclohexyl) -phenol, N, N-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydro) Phenol) and the like. In addition, oligomer-type and polymer-type compounds having a hindered phenol structure can also be used.
Commercially available products are ADEKA's ADEKA STAB AO-20, AO-30, AO-40, AO50, AO60, AO80, AO320, Chemipro's KEMINOX101, 179, 76, 9425, BASF Japan's IRGANOX1010, 1035, 1076, 1098, Examples thereof include 1135, 1330, 1726, 1425WL, 1520L, 245, 259, 3114, 5057, 565, Sianox CY-1790 and CY-2777 manufactured by Sun Chemical.

Examples of the hindered amine antioxidants include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and bis (N-methyl-2,2,6,6-tetramethyl-4-piperidyl) sebacate. N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl) -1,6-hexamethylenediamine, 2-methyl-2- (2,2,6,6-tetramethyl-4) -Piperidyl) Amino-N- (2,2,6,6-tetramethyl-4-piperidyl) propionamide, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) (1,2,3) 4-butanetetracarboxylate, poly [{6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-diyl} {(2,2,6,6) -Tetramethyl-4-piperidyl) imino} hexamethyl {(2,2,6,6-tetramethyl-4-piperidyl) imino}], poly [(6-morpholino-1,3,5-triazin-2,4) -Diyl) {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethine {(2,2,6,6-tetramethyl-4-piperidyl) imino}], dimethyl succinate and 1- (2-Hydroxyethyl) -4-hydroxy-2,2,6,6-polycondensate with tetramethylpiperidine, N, N'-4,7-tetrakis [4,6-bis {N-butyl-N -(1,2,2,6,6-pentamethyl-4-piperidyl) amino} -1,3,5-triazine-2-yl] -4,7-diazadecan-1,10-diamine and the like can be mentioned. In addition, oligomer-type and polymer-type compounds having a hindered amine structure can also be used.
Commercially available products are ADEKA's ADEKA STUB LA-52, LA-57, LA-63P, LA-68, LA-72, LA-77Y, LA-77G, LA-81, LA-82, LA-87, LA- 402F, LA-502XP, KAMISTAB29, 62, 77, 29, 94 manufactured by Chemipro Kasei, Tinuvin249, TINUVIN111FDL, 123, 144, 292, 5100 manufactured by BASF Japan, Siasorb UV-3346, UV-3329, UV manufactured by Sun Chemical Co., Ltd. -3853 and the like can be mentioned.

Phenyl antioxidants include tris (isodecyl) phosphite, tris (tridecyl) phosphite, phenylisooctylphosphite, phenylisodecylphosphite, phenyldi (tridecyl) phosphite, diphenylisooctylphosphite, diphenylisodecyl. Phenylphosphite, diphenyltridecylphosphite, triphenylphosphite, tris (nonylphenyl) phosphite, 4,4'isopropyridendiphenol alkylphosphite, trisnonylphenylphosphite, trisdinonylphenylphosphite, tris (2) , 4-di-t-butylphenyl) phosphite, tris (biphenyl) phosphite, distearyl pentaerythritol diphosphite, di (2,4-di-t-butylphenyl) pentaerythritol diphosphite, di (nonyl) Phenyl) Pentaerythritol diphosphite, Phenylbisphenol A Pentaerythritol diphosphite, Tetratridecyl 4,4'-butylidenebis (3-methyl-6-t-butylphenol) diphosphite, Hexatridecyl 1,1,3- Tris (2-methyl-4-hydroxy-5-t-butylphenyl) butanetriphosphite, 3,5-di-t-butyl-4-hydroxybenzylphosphite diethyl ester, sodium bis (4-t-butylphenyl) Phosphite, Sodium-2,2-Methylene-bis (4,6-di-t-butylphenyl) -phosphite, 1,3-bis (diphenoxyphosphonyloxy) -benzene, ethylbis phosphite (2, 4-Ditert-butyl-6-methylphenyl) and the like. In addition, oligomer-type and polymer-type compounds having a phosphite structure can also be used.
Examples of commercially available products include ADEKA's ADEKA TAB PEP-36, PEP-8, HP-10, ADEKA TAB 2112, 1178, 1500, C, 3013, TPP, BASF Japan's IRGAFOS 168, and Clariant Chemicals' Hostanox P-EPQ. ..

Examples of sulfur-based antioxidants include 2,2-thio-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] and 2,4-bis [(octylthio) methyl]-. o-cresol, 2,4-bis [(laurylthio) methyl] -o-cresol, 2,2-bis {[3- (dodecylthio) -1-oxopropoxy] methyl} propane-1,3-diylbis [3- (Dodecylthio) propionate], 2,2-thio-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] and the like. In addition, oligomer-type and polymer-type compounds having a thioether structure can also be used.
Examples of commercially available products include ADEKA Stab AO-412S and AO-503 manufactured by ADEKA, and KEMINOXPLS manufactured by Chemipro Kasei Co., Ltd.

As the benzotriazole-based antioxidant, oligomer-type and polymer-type compounds having a benzotriazole structure can be used.
Commercially available products are ADEKA's ADEKA STAB LA-29, LA-31RG, LA-32, LA-36, -412S, ChemiPro Kasei's KEMISORB71, 73, 74, 79, 279, BASF Japan's TINUVIN PS, 99- 2, 384-2, 900, 928, 1130 and the like can be mentioned.

Benzophenone-based antioxidants include 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4. -Octadecyloxybenzophenone, 2,2'dihydroxy-4-methoxybenzophenone, 2,2'dihydroxy-4,4'-dimethoxybenzophenone, 2,2', 4,4'-tetrahydroxybenzophenone, 2-hydroxy-4 Examples thereof include -methoxy-5 sulfobenzophenone and 2-hydroxy-4-methoxy-2'-carboxybenzophenone. In addition, oligomer-type and polymer-type compounds having a benzophenone structure can also be used.
Examples of commercially available products include ADEKA TAB 1413 manufactured by ADEKA, KEMISORB10, 11, 11S, 12, 111 manufactured by Chemipro Kasei Co., Ltd., UV-12 manufactured by Sun Chemical Co., Ltd., UV-329 and the like.

Examples of the triazine-based antioxidant include 2,4-bis (allyl) -6- (2-hydroxyphenyl) 1,3,5-triazine. In addition, oligomer-type and polymer-type compounds having a triazine structure can also be used.
Examples of commercially available products include ADEKA Tab LA-46 and F70 manufactured by ADEKA, KEMISORB102 manufactured by Chemipro Kasei Co., Ltd., TINUVIN400, 405, 460, 477, 479 manufactured by BASF Japan, and Siasorb UV-1164 manufactured by Sun Chemical Co., Ltd.

Examples of the salicylic acid ester-based antioxidant include phenyl salicylate, p-octylphenyl salicylate, and p-tert-butyl phenyl salicylate. In addition, oligomer-type and polymer-type compounds having a sulcylic acid ester structure can also be used.

These antioxidants can be used alone or in admixture of two or more at any ratio as required.

Further, the content of the antioxidant is more preferably 0.5 to 5.0% by mass in 100% by mass of the non-volatile content of the coloring composition because the spectral characteristics and the sensitivity are good.

<Other additives>
The infrared transmissive coloring composition of the present invention may contain a storage stabilizer as another additive in order to stabilize the viscosity of the composition over time. Further, an adhesion improving agent such as a silane coupling agent can be contained in order to enhance the adhesion with the transparent substrate.

Examples of the storage stabilizer include quaternary ammonium chloride such as benzyltrimethyl chloride and diethylhydroxyamine, organic acids such as lactic acid and phosphoric acid and their methyl ethers, t-butylpyrocatechol, tetraethylphosphine and tetraphenylphosphine. Examples thereof include organic phosphine and phosphite. The amount of the storage stabilizer used is preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the colorant.

Examples of the adhesion improver include vinylsilanes such as vinyltris (β-methoxyethoxy) silane, vinylethoxysilane, and vinyltrimethoxysilane, (meth) acrylic silanes such as γ-methacryloxypropyltrimethoxysilane, and β- (3,). 4-Epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) methyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, β- (3,4-epoxycyclohexyl) Epoxysilanes such as methyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (amino) Ethyl) γ-aminopropyltriethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldiethoxysisilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-phenyl-γ-amino Examples thereof include aminosilanes such as propyltrimethoxysilane and N-phenyl-γ-aminopropyltriethoxysilane, and silane coupling agents such as thiosilanes such as γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane. The amount of the adhesion improver used is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5% by mass, based on 100 parts by mass of the colorant.

<Manufacturing method of infrared transmissive coloring composition>
The infrared transmissive coloring composition of the present invention comprises a mixture containing a colorant (A), a resin-type dispersant (B), and an organic solvent, for example, a three-roll mill, a two-roll mill, a sand mill, a kneader, or an attritor. It is preferable to disperse the product finely using various dispersion means such as the above. Further, the infrared transmissive coloring composition of the present invention can also be produced by separately dispersing the colorant (A) and then mixing them. If the colorant such as a dye is highly soluble, specifically, if it is highly soluble in the solvent used, dissolved by stirring, and no foreign matter is confirmed, the above-mentioned fine dispersion step is performed. It does not have to be. When the mixture contains a pigment, it is preferable to use a dispersion aid such as a dye derivative in combination.

When used as an infrared transmissive photosensitive coloring composition, it is preferably prepared as a solvent-developed type or an alkali-developed type. The infrared transmissive photosensitive coloring composition includes the infrared transmissive coloring composition, a photopolymerizable monomer and / or a photopolymerization initiator, and if necessary, a solvent, other dispersion aids, and additives. Etc. can be mixed and adjusted. The photopolymerization initiator may be added at the stage of preparing the infrared transmissive coloring composition, or may be added later to the prepared infrared transmissive coloring composition.

When dispersing the colorant (A), a dispersion aid (for example, a surfactant) or the like can be appropriately used. Since the dispersion aid is excellent in dispersing the colorant and has a great effect of preventing the reaggregation of the colorant after dispersion, it is possible to obtain a transmittance in an infrared region having a high spectral transmittance.

<Dispersion aid>
(Surfactant)
Surfactants include sodium lauryl sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium stearate, sodium alkylnaphthalin sulfonate, sodium alkyldiphenyl ether disulfonate. , Monoethanolamine lauryl sulfate, Triethanolamine lauryl sulfate, Ammonium lauryl sulfate, Monoethanolamine stearate, Monoethanolamine styrene-acrylic acid copolymer, Anionic surfactants such as polyoxyethylene alkyl ether phosphate ester; Nonionic surfactants such as polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene alkyl ether phosphate, polyoxyethylene sorbitan monostearate, polyethylene glycol monolaurate; alkyl Chaotic surfactants such as quaternary ammonium salts and their ethylene oxide adducts; alkyl betaines such as alkyldimethylaminoacetic acid betaine and amphoteric surfactants such as alkylimidazolin, which may be used alone or in combination of two or more. They can be mixed and used, but are not necessarily limited to these.

The dispersion aid can be used alone or in combination of two or more.

The amount of the dispersion aid used is preferably 0.1 to 55 parts by mass, more preferably 0.1 to 45 parts by mass with respect to 100 parts by mass of the colorant. Dispersibility is further improved when an appropriate amount is used.

<Removal of coarse particles>
The colored composition of the present invention comprises coarse particles of 5 μm or more, preferably coarse particles of 1 μm or more, more preferably 0.5 μm or more, and coarse particles of 5 μm or more, preferably coarse particles of 0.5 μm or more, by means such as centrifugation, filtration with a sintering filter or a membrane filter. It is preferable to remove the mixed dust. As described above, it is preferable that the coloring composition does not contain particles having a size of 0.5 μm or more. It is more preferably 0.3 μm or less.

<Infrared transmission filter>
Next, the infrared transmission filter of the present invention will be described.
<Manufacturing method of infrared transmission filter>
The infrared transmission filter can be produced by a method of applying the infrared transmission type coloring composition of the present invention to various plastic substrates and glass substrates, a method of kneading into a plastic material, and the like. If a film that transmits infrared rays is formed, it can be produced by various methods regardless of the method. By combining the film produced by these methods with a photodiode, it can be used as various sensors such as an illuminance sensor, a distance sensor, a medical sensor, a touch sensor such as a display, and a biometric authentication sensor. Further, by using the infrared transmissive photosensitive coloring composition of the present invention and patterning it on a photodiode by a photolithography method, it can be used as an infrared transmissive filter for a solid-state image sensor. The details of the solid-state image pickup device in which the infrared transmission filter is manufactured by the photolithography method will be described below.

<Solid image sensor with infrared transmission filter layer>
A solid-state image sensor having an infrared transmission filter layer will be described. The configuration of a general infrared sensor is a configuration in which an infrared transmission filter layer is provided on a photodiode, and is not particularly limited as long as it functions as a solid-state image sensor. Be done.

A transfer electrode made of a plurality of photodiodes and polyvinyl, etc. constituting a light receiving area of a solid-state image sensor (CCD sensor, CMOS sensor, etc.) is provided on a substrate, and only the light receiving portion of the photodiode is provided on the photodiode and the transfer electrode. It has an open light-shielding film made of tungsten or the like, and has a device protective film made of silicon nitride or the like formed so as to cover the entire surface of the light-shielding film and the photodiode light-receiving part on the light-shielding film. It is a configuration having the infrared transmission filter of the present invention.

Further, a configuration having a condensing means (for example, a microlens or the like; the same applies hereinafter) on the device protective layer under the infrared transmissive filter (near the substrate), or a configuration having a condensing means on the infrared transmissive filter. And so on.

The organic CMOS sensor is composed of a thin-film panchromatic photosensitive organic photoelectric conversion film and a CMOS signal readout substrate as a photoelectric conversion layer, and the organic material plays a role of capturing light and converting it into an electric signal. It is a two-layer hybrid structure in which the inorganic material plays the role of extracting the signal to the outside, and in principle, the aperture ratio can be set to 100% with respect to the incident light. Since the organic photoelectric conversion film is a structure-free continuous film and can be laid on a CMOS signal reading substrate, it does not require an expensive microfabrication process and is suitable for pixel miniaturization.

The infrared transmission filter segment for a solid-state image pickup device according to the present invention can be formed by a known method without particular limitation, but the filter segment of the image pickup device is as fine as about submicron to a dozen microns. Therefore, it is preferable to use optical lithography.
When the infrared transmission filter segment is formed on a predetermined corresponding photoelectric conversion element, it is formed by a negative photosensitive green composition, and the thickness of the negative infrared transmission type resist layer in this case is 0.1 to 1. It shall be set in the range of 3.0 μm.

On the surface of the negative infrared transmissive resist layer formed of the negative colored film, a plurality of portions corresponding to the plurality of photoelectric conversion elements to be formed are exposed to a pattern using a photomask. Normally, the photomask has a size of 4 to 5 times the size of the pattern actually formed, and the pattern is exposed by reducing the size to 1/4 to 1/5 at the time of pattern exposure.

A typical photomask is a 4 to 5 times reticle and has a pattern having a size of 4 to 5 times the size of the pattern exposed on the surface of the negative infrared transmissive resist layer. Then, using a stepper exposure apparatus (not shown), the pattern of the photomask is reduced to 1/4 to 1/5 and exposed on the surface of the negative infrared transmissive resist layer.

Following the exposure step, an alkaline development process (development step) is performed to elute the uncured portion after exposure into a developing solution and leave the photocured portion. By this developing step, a patterned film composed of infrared transmission filter segments can be formed.

The developing method may be any of a dip method, a shower method, a spray method, a paddle method and the like, and a swing method, a spin method, an ultrasonic method and the like may be combined with these.
Before touching the developing solution, the surface to be developed can be pre-moistened with water or the like to prevent uneven development. As the developer, an organic alkaline developer that does not damage the underlying circuit or the like is desirable. The development temperature is usually 20 to 30 ° C., and the development time is 20 to 90 seconds.

Examples of the alkaline agent contained in the developing solution include aqueous ammonia, ethylamine, diethylamine, dimethylethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, choline, pyrrole, piperidine and other organic alkaline compounds, sodium hydroxide and water. Examples thereof include inorganic compounds such as potassium oxide, sodium hydrogencarbonate and potassium hydrogencarbonate.

As the developing solution, an alkaline aqueous solution obtained by diluting these alkaline agents with pure water so that the concentration is 0.001 to 10% by mass, preferably 0.01 to 1% by mass is preferably used. When a developer composed of such an alkaline aqueous solution is used, it is generally washed with pure water to remove excess developer and dried.

Finally, the filter segments thus formed are hardened.
In the production method of the present invention, after the coloring layer forming step, the exposure step, and the developing step described above are performed, if necessary, the formed coloring pattern is cured by post-heating (post-baking) or post-exposure. May include. Post-baking is a post-development heat treatment for complete curing, and is usually heat-cured at 100 to 270 ° C. When light is used, it can be carried out by g-ray, h-ray, i-ray, excimer laser such as KrF or ArF, electron beam, X-ray, etc., but at a low temperature of about 20 to 50 ° C with an existing high-pressure mercury lamp. The irradiation time is preferably 10 to 180 seconds, preferably 30 to 60 seconds.
In the case of combined use of post-exposure and post-heating, it is preferable to carry out post-exposure first.

The infrared transmission filter is manufactured by the infrared transmission layer forming step, the exposure step, and the developing step (further, if necessary, a curing step) described above.

<Infrared camera, infrared sensor>
The infrared camera and infrared sensor of the present invention have the infrared transmission filter of the present invention. Types of infrared cameras include near-infrared cameras, surveillance cameras, in-vehicle cameras, medical cameras, inspection / analysis cameras, etc., and types of infrared sensors include temperature sensors, distance sensors, medical sensors, and displays. Touch sensors such as, biometric authentication sensors, and the like can be mentioned. The configuration of the infrared camera and the infrared sensor is not particularly limited as long as it has the infrared transmission filter of the present invention and functions as the infrared camera and the infrared sensor.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited thereto. Unless otherwise specified, "parts" means "parts by mass" and "%" means "% by mass".

(Average primary particle size of pigment)
The average primary particle size of the pigment was measured by a method of directly measuring the size of the primary particle from an electron micrograph using a transmission electron microscope. Specifically, the minor axis diameter and the major axis diameter of the primary particles of each pigment were measured, and the average was taken as the particle size of the pigment primary particles. Next, for 100 or more pigment particles, the volume (mass) of each particle was obtained by approximating it to a cube having the obtained particle size, and the volume average particle size was defined as the average primary particle size.

(Mass average molecular weight of resin-type dispersed resin (B) and binder resin)
The mass average molecular weight (Mw) of the resin is converted to polystyrene measured by using a TSKgel column (manufactured by Tosoh) and a GPC (manufactured by Tosoh, HLC-8120GPC) equipped with an RI detector and using THF as a developing solvent. It is a mass average molecular weight (Mw).

(Acid value of resin type dispersed resin (B) and binder resin)
The resin acid value is a value obtained by converting the measured acid value (mgKOH / g) into a non-volatile content in accordance with the potentiometric titration method of JIS K 0070.

<Manufacturing of acid resin type dispersant (B1) solution)>
(Acid resin type dispersant (B1-1) solution)
In a reaction vessel equipped with a gas introduction tube, a thermometer, a condenser, and a stirrer, 62.6 parts of 1-dodecanol, 287.4 parts of ε-caprolactone, and 0.1 part of monobutyltin (IV) oxide as a catalyst were charged. After replacement with nitrogen gas, the mixture was heated at 120 ° C. for 4 hours and stirred. After confirming that 98% had reacted by measuring the non-volatile content, 73.3 parts of pyromellitic acid anhydride was added, and the reaction was carried out at 120 ° C. for 2 hours. By measuring the acid value, it was confirmed that 98% or more of the acid anhydride was harf esterified, and the reaction was terminated. The obtained dispersant was a white solid at room temperature and had an acid value of 51 mgKOH / g. PGMAc was added and diluted so that the non-volatile content was 40% in the non-volatile content measurement to obtain a dispersant (B-1) solution having an acid value of 51 mgKOH / g.

(Acid resin type dispersant (B1-2) solution)
10 parts of methacrylic acid, 130 parts of methyl methacrylate and 60 parts of tert-butyl acrylate were charged in a reaction vessel equipped with a gas introduction tube, a thermometer, a condenser and a stirrer, and replaced with nitrogen gas.
The inside of the reaction vessel was heated and stirred at 50 ° C., and 12 parts of 3-mercapto-1,2-propanediol was added. The temperature was raised to 90 ° C., and the reaction was carried out for 7 hours while adding a solution of 0.1 part of 2,2'-azobisisobutyronitrile added to 90 parts of propylene glycol monomethyl ether acetate. It was confirmed that 95% of the reaction occurred by measuring the non-volatile content.
Add 14 parts of pyromellitic acid anhydride, 315 parts of propylene glycol monomethyl ether acetate, and 0.4 part of 1,8-diazabicyclo- [5.4.0] -7-undecene as a catalyst, and react at 100 ° C. for 7 hours. rice field. After confirming that 98% or more of the acid anhydride was half-esterified by measuring the acid value, the reaction was terminated, and propylene glycol monomethyl ether acetate was added to dilute the acid so that the non-volatile content was 40% by measuring the non-volatile content. An acidic resin-type dispersant (B-2) solution having a value of 56 mgKOH / g and a weight average molecular weight of 20000 was obtained.

<Manufacturing of binder resin solution>
(Binder resin solution: C-1)
70.0 parts of methoxypropyl acetate was placed in a reaction vessel equipped with a thermometer, a cooling tube, a nitrogen gas introduction tube, and a stirrer in a separable 4-neck flask, the temperature was raised to 80 ° C., and the inside of the reaction vessel was replaced with nitrogen. 13.3 parts of n-butyl methacrylate, 4.6 parts of 2-hydroxyethyl methacrylate, 4.3 parts of methacrylic acid, 7.4 parts of paracumylphenol ethyleneoxide-modified acrylate (“Aronix M110” manufactured by Toa Synthetic Co., Ltd.) from the dropping tube. , 2,2'-Azobisisobutyronitrile 0.4 part mixture was added dropwise over 2 hours. After completion of the dropping, the reaction was continued for another 3 hours to obtain a solution of an acrylic resin having a mass average molecular weight of 26,000. After cooling to room temperature, about 2 g of the resin solution was sampled, heated and dried at 180 ° C. for 20 minutes to measure the non-volatile content, and methoxypropyl acetate was added to the previously synthesized resin solution so that the non-volatile content was 40%. To prepare a binder resin solution (C-1).

<Manufacturing of refined pigments>
(Blue organic pigment (A-1))
Blue organic pigment C.I. I. Pigment Blue 15: 6 (PB15: 6) (Toyo Color Co., Ltd. "Rionol Blue ES") 100 parts, crushed salt 800 parts, and diethylene glycol 100 parts were charged into a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho). It was kneaded at 70 ° C. for 12 hours. This mixture is put into 3000 parts of warm water, stirred with a high speed mixer for about 1 hour while heating at about 70 ° C. to form a slurry, filtered and washed with water repeatedly to remove salt and solvent, and then at 80 ° C. for 24 hours. It was dried to obtain a finely divided blue organic pigment (A-1). The average primary particle size of the obtained pigment was 28.3 nm.

(Blue organic pigment (A-2))
C. I. Pigment Blue 15: 6 ("Rionol Blue ES" manufactured by Toyo Color Co., Ltd.) was used as C.I. I. Pigment Blue 15: 3 (PB15: 3) (“Lionol Blue FG-7351) manufactured by Toyo Color Co., Ltd.) is treated in the same manner as the blue organic pigment (A-1) except that it is changed to a finely divided blue organic pigment. (A-2) was obtained. The average primary particle size of the obtained pigment was 30.9 nm.

(Blue organic pigment (A-3))
C. I. Pigment Blue 15: 6 ("Rionol Blue ES" manufactured by Toyo Color Co., Ltd.) was used as C.I. I. Pigment Blue 15: 4 (PB15: 4) (“Lionol Blue FG-7400G” manufactured by Toyo Color Co., Ltd.) is treated in the same manner as the blue organic pigment (A-1) except that it is a finely divided blue organic pigment. (A-3) was obtained. The average primary particle size of the obtained pigment was 32.1 nm.

(Yellow organic pigment (A-4))
Yellow organic pigment C.I. I. Pigment Yellow 139 (PY139) (Clariant's "Novoperm Yellow P-M3R"), 800 parts of crushed salt, and 100 parts of diethylene glycol were placed in a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho) and 12 at 70 ° C. Time kneaded. This mixture is put into 3000 parts of warm water, stirred with a high speed mixer for about 1 hour while heating at about 70 ° C. to form a slurry, filtered and washed with water repeatedly to remove salt and solvent, and then at 80 ° C. for 24 hours. The mixture was dried to obtain a finely divided yellow organic pigment (A-4). The average primary particle size of the obtained pigment was 41.1 nm.

(Purple organic pigment (A-5))
Purple organic pigment C.I. I. Pigment Violet 23 (PV23) (“LIONOGEN VIOLET FG-6140” manufactured by Toyo Color Co., Ltd.), 800 parts of crushed salt, and 100 parts of diethylene glycol were charged in a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho) at 70 ° C. Kneaded for 12 hours. This mixture is put into 3000 parts of warm water, stirred with a high speed mixer for about 1 hour while heating at about 70 ° C. to form a slurry, filtered and washed with water repeatedly to remove salt and solvent, and then at 80 ° C. for 24 hours. The mixture was dried to obtain a finely divided purple organic pigment (A-5). The average primary particle size of the obtained pigment was 53.7 nm.

(Other organic pigments (A-6))
C. I. Pigment Yellow 185 (PY185) (BASF Japan's "Paliogen Yellow D1155") 95 parts, dye derivative (b-1), 5 parts, rosin maleic acid resin (Arakawa Chemical Industry's "Marquid 32") 10 parts, 1200 parts of sodium chloride and 120 parts of diethylene glycol were charged in a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho Co., Ltd.) and mixed at 60 ° C. for 8 hours. Next, this kneaded product was put into 8000 parts of warm water, stirred for 1 hour while heating at about 70 ° C. to form a slurry, filtered and washed with water repeatedly to remove sodium chloride and diethylene glycol, and then at 80 ° C. for 24 hours. It was dried to obtain a finely divided organic pigment (A-6). The average primary particle size of the obtained pigment was 40.7 nm.

(Other organic pigments (A-7))
C. I. Pigment Red 177 (PR177) (BASF Japan's "Chromophthalred A2B" (anthraquinone-based red pigment)) 100 parts, sodium chloride 1200 parts, and diethylene glycol 120 parts are charged in a stainless steel 1-gallon kneader (Inoue Seisakusho). , Kneaded at 60 ° C. for 6 hours and subjected to salt milling treatment. The obtained kneaded product was put into 3 liters of warm water, stirred for 1 hour while heating at 70 ° C. to form a slurry, filtered and washed with water repeatedly to remove sodium chloride and diethylene glycol, and then dried at 80 ° C. overnight. , A finely divided organic pigment (A-7) was obtained. The average primary particle size of the obtained pigment was 38.6 nm.

<Manufacturing of dye derivatives>
(Dye derivative (f-1))
A dye derivative having the structure shown below was prepared with reference to the literature shown in the above description of the dye derivative.

<Manufacturing of infrared transmissive coloring composition>
[Example 1]
The following materials are stirred and mixed so as to be uniform, and then dispersed for 3 hours with an Eiger mill (“Mini Model M-250 MKII” manufactured by Eiger Japan) using zirconia beads having a diameter of 0.5 mm, and then having a pore diameter of 5.0 μm. The colorant solution (PP-1) was prepared by filtering with the filter of.
Pigment (A-1): 2.3 parts Pigment (A-4): 2.3 parts Pigment (A-5): 2.0 parts Dye derivative (f-1): 1.5 parts Acidic resin type dispersant ((B-2): 40% non-volatile content liquid): 24.0 parts Binder ((C-1): 40% non-volatile content liquid): 6.0 parts propylene glycol monomethyl ether acetate (PGMAc): 62.0 parts

[Examples 2 to 11, Comparative Examples 1 to 3]
(Infrared Transmissive Coloring Compositions (PP-2) to (PP-14)
Infrared transmissive coloring compositions (PP-2 to PP-14) were prepared in the same manner as in Example 1 except that the compositions were changed to those shown in Table 1. As for the colorant, only the pigment ratio (mass ratio) was changed without changing the total content.

<Evaluation of infrared transmissive coloring composition>
The obtained infrared transmissive coloring composition was evaluated for initial viscosity, storage stability (viscosity), and light-shielding property as follows. The evaluation is as follows. ◎ is a very good level, ○ is a good level, △ is a practical level, and × is a level that is not suitable for practical use.

(Evaluation of initial viscosity)
The viscosity of the obtained infrared transmissive coloring composition immediately after preparation was measured using an E-type viscometer and evaluated according to the following criteria.
⊚: Viscosity is 5.00 or more and less than 8.00 〇: Viscosity is 8.00 or more and less than 10.00 Δ: Viscosity is 10.00 or more and less than 15.00 ×: Viscosity is 15.00 or more

(Evaluation of storage stability (viscosity evaluation))
The viscosities of the obtained infrared transmissive coloring composition immediately after preparation and after storage at 10 ° C. for 1 month were measured using an E-type viscometer. The ratio of (viscosity after storage for 1 month) / (viscosity immediately after adjustment) was calculated and evaluated according to the following criteria.
⊚: Viscosity ratio is 1.00 or more and less than 1.02 〇: Viscosity ratio is 1.02 or more and less than 1.05 Δ: Viscosity ratio is 1.05 or more and less than 1.10 ×: Viscosity ratio is 1.10 that's all

(Evaluation of light blocking effect)
The obtained infrared transmissive coloring composition is applied onto a glass substrate having a thickness of 100 mm × 100 mm and a thickness of 1.1 mm using a spin coater, and baked in an oven at 230 ° C. for 30 minutes to form a coating film after heat treatment. A coated substrate was prepared so that the thickness was 2.0 μm.
The light-shielding property in the visible region was evaluated by measuring the maximum transmittance in the 400 to 700 nm region of the prepared substrate.
⊚: Maximum transmittance is less than 3.0% 〇: Maximum transmittance is 3.0% or more and less than 5.0% Δ: Maximum transmittance is 5.0% or more and less than 7.0% ×: Maximum transmittance Is 7.0% or more

Table 2 shows the results of evaluation by the above method.

As shown in the results of Table 2, the infrared transmissive coloring compositions of Examples 1 to 11 are excellent in initial viscosity and storage stability, and can form a film having good light-shielding property.

Claims (5)

An infrared transmissive coloring composition containing a colorant (A), a resin-type dispersant (B), and a binder resin (C).
20 to 50% by mass of copper phthalocyanine blue pigment in 100% by mass of the colorant (A), C.I. I. 20-50% by weight of Bigment Yellow 139, and C.I. I. Contains 15-45% by mass of Pigment Violet 23
An infrared transmissive coloring composition in which the content of the colorant (A) is 40 to 80% by mass in the non-volatile content of the infrared transmissive coloring composition. The copper phthalocyanine blue pigment is C.I. I. The infrared transmissive coloring composition according to claim 1, which is one or more selected from the group consisting of Bigment Blue 15: 3, 15: 4 and 15: 6. An infrared transmission filter comprising a coating film formed from the infrared transmission type coloring composition according to claim 1 or 2. An infrared camera comprising the infrared transmission filter according to claim 3. An infrared sensor comprising the infrared transmission filter according to claim 3.