Resin compositions, pellets, molded articles, and infrared sensors

Abstract

To provide a resin composition capable of providing a molded article which has a low light transmittance in a short wavelength region of visible light ray or the like, a high light transmittance in a long wavelength region of infrared ray or the like, and has a small change in the light transmittance in an infrared ray region even when being retained at the time of molding a polycarbonate resin, to provide a pellet using the resin composition, to provide a molded article using the resin composition, and to provide an infrared ray sensor.SOLUTION: A resin composition contains 0.01-0.5 pt.mass of non-metal dyestuff having a maximum absorption wavelength in a region of a wavelength of 600 nm-900 nm, and 0.01-5 mass ppm of a non-aromatic organometallic complex based on 100 pts.mass of a polycarbonate resin.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a resin composition, pellets, a molded product, and an infrared sensor. In particular, it relates to a resin composition mainly composed of a polycarbonate resin.

Background Art

[0002] Polycarbonate resin is a resin excellent in transparency, heat resistance, mechanical properties, and electrical properties, and is widely used as a material for manufacturing various parts. One example of the use of polycarbonate resin is an infrared sensor. The infrared sensor uses near-infrared rays in the vicinity of 850 nm to 1700 nm, and requires a filter that shields visible light in order to increase the sensitivity of the light receiving part. When using polycarbonate resin, infrared absorbers, dyes, etc. necessary for shielding visible light are added to the polycarbonate resin to shield visible light and transmit infrared rays.

[0003] In recent years, infrared sensors are also used in automatic driving control and safe driving control of automobiles, remote control of electronic and electrical equipment, alarm devices, etc., and a high-precision sensor function is required. Therefore, the infrared transmission filter needs to selectively transmit infrared rays of a desired wavelength used for the sensor in order to prevent malfunction due to visible light, shield visible light up to a wavelength as close as possible to the wavelength of the infrared rays used, and remove noise.

[0004] As an infrared transmission filter, for example, an infrared transmission filter obtained by blending an anthraquinone-based dye having a specific structure with a polycarbonate resin has been proposed in Patent Document 1.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Furthermore, the transmission and blocking performance required of infrared sensors is becoming increasingly sophisticated, and there is a growing demand for higher light transmittance in the long-wavelength region, such as infrared. In addition, there is a need to obtain molded products in which the change in light transmittance in the long-wavelength region, such as infrared, is minimal even when polycarbonate resin is retained during molding. The present invention aims to solve the above problems and to provide a resin composition that can provide a molded product having low light transmittance in the short-wavelength region such as visible light, high light transmittance in the long-wavelength region such as infrared light, and small change in light transmittance in the infrared region even when the polycarbonate resin remains in place during molding. The invention also aims to provide pellets, molded products, and infrared sensors using the resin composition. [Means for solving the problem]

[0007] The above problems were solved by further incorporating a non-aromatic organometallic complex into a resin composition containing polycarbonate resin and a non-metallic dye having a maximum absorption wavelength in the 600nm to 900nm wavelength range. Specifically, the above problem was solved by the following means. <1> A resin composition comprising 100 parts by mass of polycarbonate resin, 0.01 to 0.5 parts by mass of a nonmetallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm, and 0.01 to 5 ppm by mass of a non-aromatic organometallic complex. <2> The nonmetallic dye having the maximum absorption wavelength in the wavelength range of 600 nm to 900 nm includes a nonmetallic dye having the maximum absorption wavelength in the wavelength range of 600 nm to 700 nm. <1> The resin composition described above. <3> The nonmetallic dye having the maximum absorption wavelength in the wavelength range of 600 nm to 900 nm includes at least one selected from the group consisting of methine dyes, perinone dyes, and anthraquinone dyes. <1> or <2> The resin composition described above. <4> The nonmetallic dye having the maximum absorption wavelength in the wavelength range of 600 nm to 900 nm includes anthraquinone-based dyes. <1> or <2> The resin composition described above. <5> Furthermore, it contains a nonmetallic dye having its maximum absorption wavelength in the region less than 600 nm in a ratio of 0.01 to 0.5 parts by mass per 100 parts by mass of polycarbonate resin. <1> ~ <4> A resin composition as described in any one of the following. <6> The non-aromatic organometallic complex includes at least one selected from the group consisting of non-aromatic organoiron complexes, non-aromatic organozinc complexes, and non-aromatic organocopper complexes. <1> ~ <5> A resin composition as described in any one of the following. <7> The nonmetallic dye having the maximum absorption wavelength in the wavelength range of 600 to 900 includes anthraquinone-based dye having the maximum absorption wavelength in the wavelength range of 600 to 700, and the non-aromatic organometallic complex includes at least one selected from the group consisting of non-aromatic organoiron complexes, non-aromatic organozinc complexes, and non-aromatic organocopper complexes. <1> or <2> The resin composition described above. <8> The non-aromatic organometallic complex comprises an acetylacetone metal complex. <1> ~ <7> A resin composition as described in any one of the following. <9> <1> ~ <7> A pellet of the resin composition described in any one of the following. <10> <1> ~ <7> A molded article formed from any one of the resin compositions described in that one. <11> <9> A molded product formed from the pellets described above. <12> <1> ~ <7> An infrared sensor comprising a molded article formed from any one of the resin compositions described in the present invention. <13> <9> An infrared sensor, including a molded product formed from the pellets described above. [Effects of the Invention]

[0008] The present invention provides a resin composition that has low light transmittance in the short-wavelength region such as visible light, high light transmittance in the long-wavelength region such as infrared light, and a molded product in which the change in light transmittance in the infrared region is small even when the polycarbonate resin remains in place during molding. It also provides pellets, molded products, and infrared sensors using the resin composition. [Modes for carrying out the invention]

[0009] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). Note that the following embodiment is illustrative for explaining the present invention, and the present invention is not limited to this embodiment. In this specification, "~" is used to mean that the numbers before and after it are included as the lower and upper limits, respectively. In this specification, all physical properties and characteristic values ​​shall be those at 23°C unless otherwise specified. If the measurement methods, etc., described in the standards shown herein differ from year to year, unless otherwise specified, the standards as of January 1, 2022 shall apply.

[0010] The resin composition of this embodiment is characterized by containing, per 100 parts by mass of polycarbonate resin, 0.01 to 0.5 parts by mass of a nonmetallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm, and 0.01 to 5 ppm by mass of a non-aromatic organometallic complex. With this configuration, it is possible to provide a molded product that has low light transmittance in the short wavelength range such as visible light, high light transmittance in the long wavelength range such as infrared light, and small changes in light transmittance in the infrared range even when the polycarbonate resin remains in place during molding. In other words, by blending a nonmetallic dye having a maximum absorption wavelength in the 600nm to 900nm range with polycarbonate resin, light in the range corresponding to the maximum absorption wavelength range of the nonmetallic dye (short-wavelength light) can be effectively absorbed, thereby lowering the light transmittance. On the other hand, light in the wavelength range that is not easily absorbed by the blended nonmetallic dye (long-wavelength light) is transmitted. Therefore, the resulting molded product can have excellent wavelength selectivity. Furthermore, in this embodiment, by blending a non-aromatic organometallic complex, it was possible to further increase the light transmittance in the long-wavelength range without hindering the absorption of light in the short-wavelength range. In addition, it was possible to effectively suppress the decrease in light transmittance during stagnation molding and reduce the difference in light transmittance between normally molded products and stagnation-molded products.

[0011] The resin composition of this embodiment includes a polycarbonate resin. The polycarbonate resin is not particularly limited as long as it contains a carbonate ester bond-containing -[OR-OC(=O)]- unit in the molecular main chain (where R is an organic group, preferably a hydrocarbon group, more preferably an aliphatic group, an aromatic group, or a group containing both an aliphatic and an aromatic group, and furthermore, a linear or branched structure). In this embodiment, the polycarbonate resin is preferably an aromatic polycarbonate resin, and more preferably a polycarbonate resin having a bisphenol skeleton. By using such a polycarbonate resin, better heat resistance and toughness can be achieved. In this embodiment, the polycarbonate resin having a bisphenol skeleton preferably has 90 mol% or more of its total constituent units having a bisphenol skeleton, more preferably 90 mol% or more of its total constituent units being derived from bisphenol A and bisphenol C, and even more preferably 90 mol% or more of its total constituent units being derived from bisphenol A.

[0012] Also, the viscosity average molecular weight (Mv) of the polycarbonate resin is preferably 10,000 or more, more preferably 12,000 or more, and even more preferably 15,000 or more. By setting it to the above lower limit value or more, the durability of the obtained molded product tends to be further improved. The upper limit value of the viscosity average molecular weight (Mv) of the polycarbonate resin is preferably 50,000 or less, more preferably 40,000 or less, even more preferably 30,000 or less, and still more preferably 25,000 or less. By setting it to the above upper limit value or less, the molding processability of the molded product tends to be further improved. The viscosity average molecular weight (Mv) is obtained by using methylene chloride as a solvent, measuring the intrinsic viscosity [η] (unit: dL / g) at a temperature of 25°C using an Ubbelohde viscometer, and calculating it from the Schnell viscosity formula, that is, η = 1.23×10 -4 ×Mv 0.83 、and means the value calculated therefrom. When using two or more polycarbonate resins, it is the viscosity average molecular weight of the mixture.

[0013] The manufacturing method of the polycarbonate resin is not particularly limited, and those manufactured by conventionally known phosgene method (interfacial polymerization method) or melting method (ester exchange method) can be used. Also, when using the melting method, a polycarbonate resin with the amount of OH groups at the terminal adjusted can be used.

[0014] In addition to the above, details of the polycarbonate resin can be referred to the descriptions in paragraphs 0013 to 0041 of JP-A-2021-084942 and paragraphs 0030 to 0035 of JP-A-2021-119211, and this content is incorporated herein.

[0015] In the resin composition of the present embodiment, the content of the polycarbonate resin is preferably 85% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 98% by mass or more of the resin composition. The upper limit of the content of the polycarbonate resin in the resin composition is the amount at which the total of the polycarbonate resin, the non-metallic dye, and the non-aromatic organometallic complex is 100% by mass. The resin composition of the present embodiment may contain only one type of polycarbonate resin or may contain two or more types. When two or more types are contained, it is preferable that the total amount is within the above range.

[0016] <Non-metallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm> The resin composition of the present embodiment contains a non-metallic dye (which may be simply referred to as "non-metallic dye" in this specification) having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm. By containing the non-metallic dye, it is possible to suppress the transmission of light in the absorption wavelength region of the non-metallic dye. In the present embodiment, the maximum absorption wavelength of the non-metallic dye can be, for example, less than 870 nm, 800 nm or less, less than 800 nm, 700 nm or less, less than 700 nm, etc., and can also be 700 nm or more, 770 nm or more, etc. The wavelength region having the maximum absorption wavelength of the non-metallic dye can be appropriately selected according to the use and the like. An example of the non-metallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm in the present embodiment is a non-metallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 700 nm. Here, the non-metallic dye means a dye that does not contain a metal, but may contain a trace amount of metal contained in a catalyst used in the synthesis process or the like. In the present embodiment, such a dye is also treated as a non-metallic dye. (The same applies to other non-metallic dyes described later).

[0017] In the present embodiment, the maximum absorption wavelength of the non-metallic dye is defined as the maximum absorption wavelength of the absorption curve obtained from the following formula (X) in accordance with JIS K7105. [Absorbance of polycarbonate resin containing 0.005% by mass of dye] - [Absorbance of polycarbonate resin alone] ... (X)

[0018] Furthermore, it is preferable that the nonmetallic dye includes at least one selected from the group consisting of quaterylene dyes, methine dyes, condensed polycyclic dyes, phthalocyanine dyes, perinone dyes, and anthraquinone dyes, and more preferably that it includes at least one selected from the group consisting of methine dyes, perinone dyes, and anthraquinone dyes, and more preferably that it includes anthraquinone dyes.

[0019] Quaterine-based dyes are typically dyes having a quaterylene-3,4:13,14-tetracarboxylate diimide structure, and dyes with such a structure are preferred among quaterylene-based dyes. Quaterine-based dyes are available commercially, and from among them, those with a maximum absorption wavelength in the range of 700-800 nm can be selected and used, such as BASF Color & Effects' "Lumogen IR765" (maximum absorption wavelength: 740-790 nm) and "Lumogen IR788" (maximum absorption wavelength: 760-810 nm).

[0020] Various types of anthraquinone dyes are commercially available, and from among them, those with a maximum absorption wavelength in the range of 700-800 nm can be selected and used, such as Sumika Color Co., Ltd.'s product name "NIR-840S" (maximum absorption wavelength: 740-790 nm).

[0021] For example, as a condensed polycyclic dye, you can select and use "SDO-C33" (maximum absorption wavelength: 820-870nm) manufactured by Arimoto Chemical Co., Ltd., and as a phthalocyanine dye, you can select and use "IR-14" (maximum absorption wavelength: 810-860nm) manufactured by Nippon Shokubai Co., Ltd.

[0022] The nonmetallic dye content in the resin composition of this embodiment is 0.01 parts by mass or more, preferably 0.03 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, per 100 parts by mass of polycarbonate resin. Setting it above the lower limit tends to effectively suppress light transmission. Furthermore, the upper limit of the nonmetallic dye content is 0.5 parts by mass or less, preferably 0.4 parts by mass or less, and more preferably 0.3 parts by mass or less, per 100 parts by mass of polycarbonate resin. Setting it below the upper limit tends to further improve thermal stability. The resin composition of this embodiment may contain only one nonmetallic dye, or it may contain two or more nonmetallic dyes. When it contains two or more nonmetallic dyes, it is preferable that the total amount is within the above range.

[0023] <Non-aromatic organometallic complexes> The resin composition of this embodiment contains a non-aromatic organometallic complex. By including the non-aromatic organometallic complex, the light transmittance in the long-wavelength region can be increased without hindering the absorption of light in the short-wavelength region.

[0024] While there are no specific requirements for non-aromatic organometallic complexes, it is preferable that the non-aromatic organometallic complex includes at least one selected from the group consisting of non-aromatic organoiron complexes, non-aromatic organozinc complexes, and non-aromatic organocopper complexes.

[0025] The ligand constituting the aforementioned non-aromatic organometallic complex is not particularly limited as long as it is non-aromatic and acts as a metal ligand, but a ligand whose coordination site is an oxygen atom is preferred, and a ligand represented by the following formula (1) is more preferred. Formula (1) [ka] (In formula (1), R 1 ~R 3 Each of these is independently either a hydrogen atom or an organic group. * indicates a coordination site with a metal. R 1 and R3 Each of these groups is preferably an organic group having 1 to 12 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 2 to 11 carbon atoms, even more preferably an alkyl group having 1 to 10 carbon atoms, even more preferably a methyl group or an ethyl group, and even more preferably a methyl group. R 2 It is preferably a hydrogen atom or an organic group having 1 to 12 carbon atoms, more preferably a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an alkoxy group having 2 to 11 carbon atoms, even more preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, even more preferably a hydrogen atom, a methyl group, or an ethyl group, even more preferably a hydrogen atom or a methyl group, and even more preferably a hydrogen atom.

[0026] The non-aromatic organometallic complex of this embodiment preferably includes an acetylacetone metal complex. Examples of acetylacetone metal complexes are shown below, but it goes without saying that this embodiment is not limited to these. [ka]

[0027] Furthermore, the acetylacetone metal complex in this embodiment includes not only a single acetylacetone metal complex but also a complex of a mixed ligand consisting of acetylacetone and other ligands. However, the acetylacetone metal complex in this embodiment is preferably a single acetylacetone metal complex.

[0028] The content of the non-aromatic organometallic complex in the resin composition of this embodiment is 0.01 ppm by mass or more, preferably 0.05 ppm by mass or more, more preferably 0.1 ppm by mass or more, and even more preferably 0.2 ppm by mass or more, per 100 ppm by mass of polycarbonate resin. By setting it above the lower limit, the decrease in light transmittance in the long wavelength region can be effectively suppressed even when molded in a stagnant state. Furthermore, the upper limit of the content of the non-aromatic organometallic complex is 5 ppm by mass or less (5.00 ppm by mass or less), preferably 4 ppm by mass or less, more preferably 3 ppm by mass or less, even more preferably 2 ppm by mass or less, even more preferably 1 ppm by mass or less, even more preferably 0.7 ppm by mass or less, and especially even more preferably 0.4 ppm by mass or less, per 100 ppm by mass of polycarbonate resin. By setting it below the upper limit, the light transmittance of the resulting molded product can be made higher. The resin composition of this embodiment may contain only one non-aromatic organometallic complex, or it may contain two or more. When it contains two or more, it is preferable that the total amount is within the above range.

[0029] <Other non-metallic dyes> The resin composition of this embodiment may further contain a nonmetallic dye having a maximum absorption wavelength in the region of less than 600 nm (hereinafter referred to simply as "other nonmetallic dyes"), and preferably contains two or more other nonmetallic dyes. By including other nonmetallic dyes, light absorption in the region of less than 600 nm can be achieved more effectively. It is preferable to use at least one, preferably two or more, of the following nonmetallic dyes: dyes having a maximum absorption wavelength in the region of 300 nm to less than 400 nm, dyes having a maximum absorption wavelength in the region of 350 nm to less than 450 nm, dyes having a maximum absorption wavelength in the region of 400 nm to less than 500 nm, dyes having a maximum absorption wavelength in the region of 450 nm to less than 550 nm, and dyes having a maximum absorption wavelength in the region of 500 nm to less than 600 nm. By including two or more nonmetallic dyes with different maximum absorption wavelengths, the wavelength range of light that is shielded can be broadened. The number of nonmetallic dyes is practically 10 or less, and may also be 5 or less.

[0030] The type of nonmetallic dye is not particularly specified, and known nonmetallic dyes such as triarylmethane dyes, xanthene (zanthene dyes), acridine dyes, azine dyes, oxazine dyes, thiazine dyes, cyanine dyes, methine dyes, perinone dyes, anthraquinone dyes, and azo dyes can be used, and it is preferable to include at least one selected from the group consisting of methine dyes, perinone dyes, and anthraquinone dyes.

[0031] If the resin composition of this embodiment contains other nonmetallic dyes, the content thereof is preferably 0.01 parts by mass or more, and more preferably 0.02 parts by mass or more, per 100 parts by mass of polycarbonate resin. Furthermore, the upper limit of the content of the other nonmetallic dyes is preferably 0.5 parts by mass or less, more preferably 0.4 parts by mass or less, even more preferably 0.3 parts by mass or less, and even more preferably 0.2 parts by mass or less, per 100 parts by mass of polycarbonate resin. The resin composition of this embodiment may contain only one other nonmetallic dye, or it may contain two or more other nonmetallic dyes. When it contains two or more, it is preferable that the total amount is within the above range. In this embodiment, it is preferable to contain two or more other nonmetallic dyes.

[0032] <Stabilizer> The resin composition of this embodiment may contain a stabilizer. Examples of stabilizers include heat stabilizers and antioxidants. Other examples of stabilizers include phenolic, amine, phosphorus, and thioether-based stabilizers. In this embodiment, in particular, phosphorus-based heat stabilizers and / or phenolic antioxidants are preferred.

[0033] Any known phosphorus-based heat stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphate; acidic pyrophosphate metal salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and calcium acidic pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; and organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0034] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl) phosphite, tris(mononyl / dinonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite. Examples of such organic phosphite compounds include, for example, "ADEKA Stab (registered trademark; hereinafter the same) 1178," "ADEKA Stab 2112," "ADEKA Stab HP-10," and PEP-36 from ADEKA Corporation; "JP-351," "JP-360," and "JP-3CP" from Johoku Chemical Industry Co., Ltd.; "Irgaphos (registered trademark; hereinafter the same) 168" from BASF Inc.; and Doverphos (registered trademark) S-9228 from Dover Chemical Corporation.

[0035] In addition to the above, the phosphorus-based heat stabilizers used in this embodiment can also be described in paragraphs 0127 to 0133 of Japanese Patent Application Publication No. 2022-067329, and this content is incorporated herein.

[0036] As a phenolic antioxidant, a hindered phenolic antioxidant is preferably used. Specific examples of hindered phenol antioxidants include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 4,6-bis(octyl) Examples include ruthiomethyl)-o-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-ylamino)phenol, and 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate.

[0037] Among these, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred. Specific examples of such hindered phenol antioxidants include, for example, BASF's "Irganox (registered trademark; hereinafter the same) 1010" and "Irganox 1076," and ADEKA's "ADEKA Stab AO-50" and "ADEKA Stab AO-60."

[0038] The stabilizer content in the resin composition of this embodiment is typically 0.001 parts by mass or more, preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and typically 1 part by mass or less, preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, per 100 parts by mass of polycarbonate resin. By setting the stabilizer content within the above range, the effect of adding the stabilizer is more effectively exerted. The resin composition of this embodiment may contain only one stabilizer or two or more stabilizers. When two or more stabilizers are included, it is preferable that the total amount is within the above range.

[0039] <Release agent> The resin composition of this embodiment may contain a mold release agent. Examples of release agents include aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, polysiloxane-based silicone oils, ketone waxes, and light amides, with aliphatic carboxylic acids, salts of aliphatic carboxylic acids, and esters of aliphatic carboxylic acids and alcohols being preferred. Details of the release agent can be found in paragraphs 0055 to 0061 of Japanese Patent Publication No. 2018-095706, and these contents are incorporated herein by reference. If the resin composition of this embodiment contains a release agent, its content is preferably 0.05 to 3% by mass, more preferably 0.1 to 0.8% by mass, and even more preferably 0.1 to 0.6% by mass. The resin composition of this embodiment may contain only one type of release agent, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0040] <UV absorber> The resin composition of this embodiment may contain an ultraviolet absorber. By including an ultraviolet absorber, the weather resistance of the resin composition can be improved, and the improvement in weather resistance can prevent a decrease in transparency.

[0041] Examples of UV absorbers include inorganic UV absorbers such as cerium oxide and zinc oxide; and organic UV absorbers such as benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic acid ester compounds, and hindered amine compounds. Among these, organic UV absorbers are preferred, and benzotriazole compounds are more preferred. By selecting an organic UV absorber, the transparency and mechanical properties of the resin composition of this embodiment are improved.

[0042] Specific examples of benzotriazole compounds include, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-[2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl]-benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chlorobenzotriazole), and 2-(2'-hydroxy-3',5'-di-tert Examples include (-amyl)-benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2N-benzotriazole-2-yl)phenol], among which 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2N-benzotriazole-2-yl)phenol] are preferred, with 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole being particularly preferred. Examples of such benzotriazole compounds include, specifically, Cipro Chemical's "Seesorb 701 (S-701)", "Seesorb 705 (S-705)", "Seesorb 703 (S-703)", "Seesorb 702 (S-702)", "Seesorb 704 (S-704)", and "Seesorb 709 (S-709)", and Kyodo Pharmaceutical's "Biosorb 520", "Biosorb 582", and "Biosorb Examples include "580", "Biosorb 583", "Chemisorb 71" and "Chemisorb 72" from Chemipro Chemical Co., Ltd., "Siasorb UV5411" from Cytec Industries, "LA-32", "LA-38", "LA-36", "LA-34", and "LA-31" from ADEKA, and "Chinubin P", "Chinubin 234", "Chinubin 326", "Chinubin 327", and "Chinubin 328" from BASF.

[0043] Details of benzophenone compounds, salicylate compounds, cyanoacrylate compounds, oxanilide compounds, and malonic acid ester compounds can be found in paragraphs 0089 to 0093 of Japanese Patent Application Publication No. 2021-001309, the contents of which are incorporated herein by reference.

[0044] When the resin composition of this embodiment contains an ultraviolet absorber, its content is preferably 0.001 parts by mass or more, more preferably 0.01 parts by mass or more, and even more preferably 0.1 parts by mass or more, per 100 parts by mass of polycarbonate resin. Setting the content above the lower limit tends to effectively exert the effect of adding the ultraviolet absorber. Furthermore, the upper limit of the ultraviolet absorber content is preferably 3 parts by mass or less, more preferably 1 part by mass or less, even more preferably 0.5 parts by mass or less, and even more preferably 0.4 parts by mass or less, per 100 parts by mass of polycarbonate resin. Setting the content below the upper limit can effectively prevent mold contamination by mold deposits and the like. The resin composition of this embodiment may contain only one type of ultraviolet absorber, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0045] <Other ingredients> The resin composition of this embodiment may contain other components as needed, as long as they do not significantly impair the desired physical properties. Examples of other components include various resin additives. Examples of resin additives include antistatic agents, flame retardants, flame retardant enhancers, anti-dripping agents, anti-fogging agents, anti-blocking agents, flow improvers, plasticizers, dispersants, and antibacterial agents. The resin additive may contain only one type, or two or more types in any combination and ratio.

[0046] <Physical properties of resin compositions> The resin composition of this embodiment preferably exhibits high wavelength selectivity. In particular, it is preferable that the light transmittance in the short-wavelength region, such as the visible light region, is low, and the light transmittance in the long-wavelength region, such as the infrared region, is high. In this embodiment, the short-wavelength region refers to a region where the wavelength is relatively smaller than that of the long-wavelength region. That is, in this embodiment, it is not necessary that the short-wavelength region is the visible light region and the long-wavelength region is the infrared region; a part of the short-wavelength region may extend into the infrared region, and a part of the long-wavelength region may extend into the visible light region. The light transmittance in the short wavelength region is preferably 3% or less, more preferably 1% or less, even more preferably 0.5% or less, and even more preferably 0.1% or less, when the resin composition of this embodiment is molded into a test piece with a thickness of 2 mm. The lower limit of the light transmittance in the short wavelength region is ideally 0%, but greater than 0% is practical. Furthermore, the light transmittance in the long-wavelength region is preferably 52% or more, more preferably 55% or more, even more preferably 80% or more, and even more preferably 85% or more, when the resin composition of this embodiment is molded into a test piece with a thickness of 2 mm. While an ideal upper limit for the light transmittance in the long-wavelength region is 100%, 99% or less is practical. Such wavelength-selective resin compositions are achieved by using nonmetallic dyes having a maximum absorption wavelength in the 600 nm to 900 nm range. Furthermore, in this embodiment, by using non-aromatic organometallic complexes, the light transmittance in the long-wavelength region can be increased, and in particular, the decrease in light transmittance in the long-wavelength region when molded in a stagnant state can be effectively suppressed.

[0047] An example of the short-wavelength region and long-wavelength region in this embodiment is a resin composition that achieves the above wavelength selectivity when the short-wavelength region includes a wavelength range of 600 nm or more and less than 700 nm, and the long-wavelength region includes a wavelength range of 750 nm or more and 850 nm or less. Another example of the short-wavelength region and long-wavelength region in this embodiment is a resin composition that achieves the above wavelength selectivity when the short-wavelength region includes a wavelength range of 600 nm or more and less than 700 nm, and the long-wavelength region includes a wavelength range of 850 nm or more and 950 nm or less. Another example of the short-wavelength region and long-wavelength region in this embodiment is a resin composition that achieves the above wavelength selectivity when the short-wavelength region includes a wavelength range of 600 nm or more and less than 700 nm, and the long-wavelength region includes a wavelength range of 950 nm or more and 1050 nm or less. Another example of the short-wavelength region and long-wavelength region in this embodiment is a resin composition that achieves the above wavelength selectivity when the short-wavelength region includes a wavelength range of 700 nm or more and less than 800 nm, and the long-wavelength region includes a wavelength range of 900 nm or more and 1000 nm or less. Another example of the short-wavelength region and long-wavelength region in this embodiment is a resin composition that achieves the above wavelength selectivity when the short-wavelength region includes a wavelength range of 770 nm or more and less than 870 nm, and the long-wavelength region includes a wavelength range of 970 nm or more and 1070 nm or less. Furthermore, the wavelength range in the wavelength region where light transmittance changes rapidly is usually 200 nm or less, preferably 150 nm or less, and more preferably 100 nm or less, and the lower limit of the range is, for example, 1 nm or more.

[0048] <Method for producing resin compositions> There are no limitations on the manufacturing method of the resin composition of this embodiment, and a wide range of known methods for manufacturing resin compositions can be employed. For example, a method can be used in which polycarbonate resin, nonmetallic dyes, non-aromatic organometallic complexes, and other components that may be added as needed are pre-mixed using various mixers such as tumblers and Henschel mixers, and then melt-kneaded using mixers such as Banbury mixers, rolls, bravenders, single-screw extruders, twin-screw extruders, and kneaders. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0049] <Molded products> The molded article of this embodiment is formed from the resin composition of this embodiment. The resin composition described above (for example, pellets) is molded into a molded article by various molding methods. There are no particular restrictions on the shape of the molded article, and it can be appropriately selected according to the use and purpose of the molded article. Examples include film-shaped, rod-shaped, cylindrical, annular, circular, elliptical, polygonal, irregularly shaped, hollow, frame-shaped, box-shaped, panel-shaped, button-shaped, etc.

[0050] The method for molding the molded product is not particularly limited, and conventionally known molding methods can be employed. Examples include injection molding, injection compression molding, extrusion molding, shape extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. In particular, the resin composition of this embodiment is suitable for molded products obtained by injection molding, injection compression molding, and extrusion molding. However, it goes without saying that the resin composition of this embodiment is not limited to molded products obtained by these methods.

[0051] Molded articles formed from the resin composition of this embodiment have a high visible light blocking rate and a high transmittance at 800 nm, making them suitable for use as infrared sensor components. Examples of application fields for infrared sensor components include the automotive, office automation equipment, home appliances, and electrical and electronic fields. More specifically, they can be suitably used in products such as: monitoring of stores, houses, facilities, railway stations, airports, etc., access control and personal authentication; disaster prevention purposes such as monitoring road disasters (landslides, etc.), dam water levels, and active volcanoes; traffic flow, automatic speed enforcement devices, and automatic license plate recognition devices; in the automotive field, driver face orientation recognition, drowsiness prevention devices, night vision, rear sonar, lane departure prevention, following distance maintenance, and automatic accident avoidance; remote control devices for electrical equipment such as televisions, audio equipment, and air conditioning equipment; counting devices for items such as fruit; and optical character recognition devices using near-infrared light. [Examples]

[0052] The present invention will be described in more detail below with reference to examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate, as long as they do not depart from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or other reasons, measurements can be taken using other instruments with equivalent performance.

[0053] 1. Raw materials The following ingredients were used. [Table 1]

[0054] 2. Examples 1-8, Comparative Examples 1-4 <Compound> Each component listed in Table 1 was blended in the proportions listed in Table 2 or Table 3 (all expressed in parts by mass, except for metal complexes which are expressed in ppm by mass), and the mixtures were uniformly mixed in a tumbler mixer to obtain a mixture. This mixture was supplied to a twin-screw extruder (Shibaura Machine Co., Ltd. "TEX26SX") and kneaded under the conditions of a screw rotation speed of 150 rpm, a discharge rate of 20 kg / hour, and a barrel temperature of 280°C, and extruded in a strand shape from the tip of the extrusion nozzle. The extruded material was rapidly cooled in a water bath and cut into pellets using a pelletizer to obtain pellets of the resin composition.

[0055] <Light transmittance> Each resin composition obtained above was injection molded using a Japan Steel Works J85AD injection molding machine under conditions of a resin temperature of 280°C and a mold temperature of 80°C to obtain test specimens measuring 90 mm in length, 60 mm in width, and 2 mm in thickness. The light transmittance (in %) of these test specimens at wavelengths of 400 nm, 700 nm, and 800 nm was measured using a Shimadzu Corporation UV3600 ultraviolet-visible-near-infrared spectrophotometer. Furthermore, during the molding of the above-mentioned test specimens, the resin temperature was set to 320°C and the residence time to 10 minutes. Under the same conditions as above, a test specimen measuring 90 mm in length, 60 mm in width, and 2 mm in thickness was molded, and the light transmittance at a wavelength of 800 nm was measured. Furthermore, the difference in light transmittance at a wavelength of 800 nm (Δ(normal transmittance - transmittance during retention) (unit: %)) between test specimens formed by conventional molding and test specimens formed by retention was calculated. The results are shown in Table 2 or Table 3.

[0056] [Table 2]

[0057] [Table 3]

[0058] In Tables 3 and 4 above, the units of light transmittance and the difference in light transmittance Δ are in percent. In Tables 3 and 4 above, the content of components other than metal complexes is shown in parts by mass, and the content of metal complexes is shown in ppm by mass. The resin composition of this embodiment exhibited low transmittance in the short-wavelength region (wavelengths of 400 nm and 700 nm) and high transmittance in the long-wavelength region (wavelength of 800 nm). Furthermore, the light transmittance in the long-wavelength region (wavelength of 800 nm) when the resin composition was molded using a stagnant molding process was not significantly different from that when it was molded using conventional methods.

Claims

1. Per 100 parts by mass of polycarbonate resin, 0.01 to 0.5 parts by mass of a nonmetallic dye having its maximum absorption wavelength in the wavelength range of 600 nm to 900 nm, 0.01 to 0.5 parts by mass of a nonmetallic dye having its maximum absorption wavelength in the region of 400 nm to less than 600 nm, It contains 0.01 to 5 ppm by mass of acetylacetone metal complex, The acetylacetone metal complex is at least one selected from the group consisting of acetylacetone zinc complex, acetylacetone iron complex, and acetylacetone copper complex. Resin composition.

2. The resin composition according to claim 1, wherein the nonmetallic dye having a maximum absorption wavelength in the wavelength region of 600 nm to 900 nm includes a nonmetallic dye having a maximum absorption wavelength in the wavelength region of 600 nm to 700 nm.

3. The resin composition according to claim 1, wherein the nonmetallic dye having a maximum absorption wavelength in the wavelength region of 600 nm to 900 nm includes at least one selected from the group consisting of methine dyes, perinone dyes, and anthraquinone dyes.

4. The resin composition according to claim 1, wherein the nonmetallic dye having a maximum absorption wavelength in the wavelength range of 600 nm to 900 nm includes an anthraquinone-based dye.

5. A pellet formed from the resin composition according to any one of claims 1 to 4.

6. A molded article formed from the resin composition according to any one of claims 1 to 4.

7. A molded article formed from the pellets described in claim 5.

8. An infrared sensor comprising a molded article formed from a resin composition according to any one of claims 1 to 4.

9. An infrared sensor comprising a molded article formed from the pellets described in claim 5.

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