Compositions, molded articles, and optical filters

Abstract

The present invention provides a composition that exhibits good light transmission in the wavelength range used in infrared sensors, while also partially transmitting visible light and effectively suppressing noise. [Solution] A composition comprising a resin (A) containing 50% by mass or more of polycarbonate resin (a1), and a coloring agent (B) containing at least a green coloring agent (b1), a red coloring agent (b2), and a blue and / or purple coloring agent (b3), wherein the content of the coloring agent (B) is 50 to 500 parts by mass per 1.0 part by mass of the resin (A), and when the light transmittance is measured after molding to a thickness of 2 mm, the maximum value of the total light transmittance for light with wavelengths of 800 nm to 1100 nm is 85% or more.

Description

TECHNICAL FIELD

[0001] The present invention relates to a composition, a molded article containing the composition, and an optical filter for infrared sensors. BACKGROUND ART

[0002] Sensors using infrared (IR) such as infrared cameras are sometimes provided with a sensor cover for the purpose of protecting the sensor. The sensor cover is required to transmit light of a wavelength used by the sensor (hereinafter may be referred to as the "target wavelength"). Furthermore, since light having a wavelength near the target wavelength can become noise for the sensor, a member (sensor filter) that blocks light in the region near the target wavelength is sometimes used to increase the sensitivity of the sensor. As members that function as sensor covers and sensor filters, members that block visible light and transmit infrared rays have been developed, and those obtained by blending an infrared-absorbing dye or the like into a resin, for example, a polycarbonate resin, are known (for example, Patent Document 1). PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] Patent Document 1 Japanese Patent Laid-Open No. 09-3311 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0004] In recent years, there has been a demand for sensor filters through which the inside of the sensor is faintly visible.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composition having good transmittance for light in the wavelength band used in infrared sensors, partially transmitting visible light, and satisfactorily suppressing noise, as well as a molded article containing the composition and an optical filter for infrared sensors. [Means for solving the problem]

[0006] As a result of diligent research, the inventors have found that the following invention can solve the above problems, and have completed the present invention. That is, the present invention includes the following embodiments, and also includes embodiments that are any combination of the following embodiments.

[0007] <1> A composition comprising a resin (A) and a coloring agent (B), wherein the resin (A) contains 50% by mass or more of polycarbonate resin (a1), and the coloring agent (B) contains at least a green coloring agent (b1), a red coloring agent (b2), and a blue and / or purple coloring agent (b3), the content of the coloring agent (B) is 50 ppm by mass or more and 500 ppm by mass or less per 1.0 mass part of the resin (A), and when the composition is molded to a thickness of 2 mm and the light transmittance is measured, the maximum value of the total light transmittance for light with a wavelength of 800 nm to 1100 nm is 85% or more. <2> The content of the red coloring agent (b2) is 0.50 parts by mass or more and 3.5 parts by mass or less per 1.0 part by mass of the green coloring agent (b1), and the content of the blue and / or purple coloring agent (b3) is 0.20 parts by mass or more and 2.5 parts by mass or less per 1.0 part by mass of the green coloring agent (b1), <1> The composition described above. <3> The coloring agent (B) further comprises a yellow coloring agent (b4), wherein the content of the yellow coloring agent (b4) is 0.02 parts by mass or more and 2.0 parts by mass or less per 1.0 part by mass of the green coloring agent (b1). <1> or <2> The composition described above. <4> The amount of the green coloring agent (b1) is 10 ppm or more and 200 ppm or less per 1.0 part by mass of resin (A) contained in the composition. <1> from <3> A composition as described in any of the following. <5> The coloring agent (B) further comprises an orange-coloring agent (b5), <1> from <4> A composition as described in any of the following. <6> When the material is molded to a thickness of 2 mm and the light transmittance is measured, the average value of the total light transmittance for light with wavelengths of 450 nm to 700 nm is between 2.0% and 60%. <1> from <5> A composition as described in any of the following. <7> When the material is molded to a thickness of 2 mm and the light transmittance is measured, the total light transmittance for light with wavelengths of 450 nm to 700 nm is 2.0% to 60%. <1> from <6> A composition as described in any of the following. <8> When molded to a thickness of 1 mm, L * C * In the h color space, saturation C * The value is 15.0 or less. <1> from <7> A composition as described in any of the following. <9> Furthermore, the above includes an infrared absorber (C). <1> from <8> A composition as described in any of the following. <10> When the material is molded to a thickness of 2 mm and the light transmittance is measured, the total light transmittance for light with wavelengths of 800 nm to 1100 nm is 85% or more. <1> from <9> A composition as described in any of the following. <11> When the material is molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with wavelengths of 700 nm to 800 nm is 60% or less, and the total light transmittance for light with wavelengths of 900 nm to 1100 nm is 85% or more. <1> from <9> A composition as described in any of the following. <12> When the material is molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with wavelengths of 700 nm to 900 nm is 60% or less, and the total light transmittance for light with wavelengths of 1000 nm to 1100 nm is 85% or more. <1> from <9> A composition as described in any of the following. <13> The aforementioned <1> from <12> A molded article comprising any of the compositions described in one of the following. <14> The aforementioned <13> An optical filter for an infrared sensor, including the molded body described above. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a composition that has good light transmittance in the wavelength band used in infrared sensors, partially transmits visible light, and effectively suppresses noise, as well as a molded article containing the composition and an optical filter for infrared sensors. [Brief explanation of the drawing]

[0009] [Figure 1] The transmission spectra in the 350-1100 nm range for Examples 1 and 2 and Comparative Example 2 are shown. [Figure 2] The transmission spectra in the 350-1100 nm range for Examples 3 and 4, and Comparative Examples 1 and 3 are shown. [Figure 3] The transmission spectra in the 350-1100 nm range for Examples 5-7 are shown. [Figure 4] The transmission spectra in the 350-1100 nm range for Examples 8-10 are shown. [Figure 5] The transmission spectra in the 350-1100 nm range for Examples 11 and 12 are shown. [Figure 6] The transmission spectra in the 400-800 nm range for Examples 1 and 2 and Comparative Example 2 are shown. [Figure 7] The transmission spectra in the 400-800 nm range for Examples 3 and 4, and Comparative Examples 1 and 3 are shown. [Figure 8] The transmission spectra in the 400-800 nm range for Examples 5-7 are shown. [Figure 9] The transmission spectra in the 400-800 nm range for Examples 8-10 are shown. [Figure 10] The transmission spectra in the 400-800 nm range for Examples 11 and 12 are shown. [Modes for carrying out the invention]

[0010] The embodiments of the present invention will be described in detail below, but the description of the constituent elements described below is just one example (representative example) of an embodiment of the present invention, and the present invention is not limited to the following unless its gist is changed. In this specification, when the expression "~" is used, it is used to mean an expression that includes the numerical value or physical property value before and after it.

[0011] <Composition> The present invention relates to a composition comprising a resin (A) and a coloring agent (B), wherein the resin (A) contains 50% by mass or more of polycarbonate resin (a1), and the coloring agent (B) contains at least a green coloring agent (b1), a red coloring agent (b2), and a blue and / or purple coloring agent (b3), and the composition (hereinafter sometimes referred to as "the composition of the present invention") is formed to a thickness of 2 mm and the light transmittance is measured, wherein the maximum value of the total light transmittance for light with wavelengths of 800 nm to 1100 nm is 85% or more.

[0012] The components constituting the composition of the present invention will be described in detail below. In one embodiment, the present invention is a resin composition. In this embodiment, "composition" in this specification shall be read as "resin composition".

[0013] [Resin (A)] The resin (A) contained in the composition of the present invention contains 50% by mass or more of polycarbonate resin (a1). That is, resin (A) may consist of one type of resin or may contain two or more types of resins, in either case the main component is polycarbonate resin (a1). The proportion of polycarbonate resin (a1) contained in resin (A) is preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, particularly preferably 90% by mass or more, and may also be 100% by mass.

[0014] Polycarbonate resin (a1) is a polymer with a basic structure having a carbonate bond represented by the formula: -[-OXOC(=O)-]-. In the formula, X is generally a hydrocarbon, but heteroatoms and heterobonded X may be used to impart various properties.

[0015] Furthermore, polycarbonate resin (a1) can be classified into aromatic polycarbonate resin, in which the carbon atoms directly bonded to the carbonate bonds are aromatic carbon atoms, and aliphatic polycarbonate resin, in which the carbon atoms are aliphatic carbon atoms, and either can be used. Among these, aromatic polycarbonate resin is preferred from the viewpoint of heat resistance, mechanical properties, electrical properties, etc.

[0016] There are no specific restrictions on the type of polycarbonate resin (a1), but examples include polycarbonate polymers obtained by reacting a dihydroxy compound with a carbonate precursor. In this case, polyhydroxy compounds may be reacted in addition to the dihydroxy compound and the carbonate precursor. Alternatively, a method may be used in which carbon dioxide is used as the carbonate precursor and reacted with a cyclic ether. Furthermore, the polycarbonate polymer may be linear or branched. In addition, the polycarbonate polymer may be a monopolymer consisting of one type of repeating unit, or a copolymer having two or more types of repeating units. In this case, various copolymerization forms such as random copolymers and block copolymers can be selected. Typically, such polycarbonate polymers are thermoplastic resins.

[0017] Examples of aromatic dihydroxy compounds among the monomers used as raw materials for aromatic polycarbonate resins include: Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol), and 1,4-dihydroxybenzene;

[0018] Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl;

[0019] Dihydroxynaphthalene compounds such as 2,2'-dihydroxy-1,1'-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, and 2,7-dihydroxynaphthalene;

[0020] Dihydroxydiaryl ethers such as 2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, and 1,3-bis(4-hydroxyphenoxy)benzene;

[0021] 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-Bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-Bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-Bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, Bis(4-hydroxyphenyl)methane, Bis(4-hydroxyphenyl)cyclohexylmethane, Bis(4-hydroxyphenyl)phenylmethane, Bis(4-hydroxyphenyl)(4-propenylphenyl)methane, Bis(4-hydroxyphenyl)diphenylmethane, Bis(4-hydroxyphenyl)naphthylmethane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1,1-Bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-Bis(4-hydroxyphenyl)hexane, 1,1-Bis(4-hydroxy-3-methylphenyl)cyclohexane, 2,2-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)octane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-Bis(4-hydroxyphenyl)dodecane, Bis(hydroxyaryl)alkanes such as;

[0022] 1,1-Bis(4-hydroxyphenyl)cyclopentane, 1,1-Bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-Bis(4-hydroxyphenyl)-4-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, 1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane, Bis(hydroxyaryl)cycloalkanes such as the above;

[0023] Cardo-structure-containing bisphenols such as 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, and 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene;

[0024] Dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide;

[0025] Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide;

[0026] Dihydroxydiarylsulfones such as 4,4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; These are some examples.

[0027] Among these, bis(hydroxyaryl)alkanes and / or bis(alkyl-hydroxyaryl)alkanes are preferred, and among them, bis(4-hydroxyphenyl)alkanes and / or bis(3-alkyl-4-hydroxyaryl)alkanes are preferred, with bis(4-hydroxyphenyl)alkanes being more preferred, and 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A) is particularly preferred from the viewpoint of impact resistance and heat resistance. Note that one aromatic dihydroxy compound may be used, or two or more may be used in any combination and ratio.

[0028] Furthermore, to give an example of monomers that are raw materials for aliphatic polycarbonate resins, Alkanediols such as ethane-1,2-diol, propane-1,2-diol, propane-1,3-diol, 2,2-dimethylpropane-1,3-diol, 2-methyl-2-propylpropane-1,3-diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, and decane-1,10-diol;

[0029] Cycloalkanediols such as cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, 1,4-cyclohexanedimethanol, 4-(2-hydroxyethyl)cyclohexanol, and 2,2,4,4-tetramethyl-cyclobutane-1,3-diol;

[0030] Glycols such as ethylene glycol, 2,2'-oxydiethanol (i.e., diethylene glycol), triethylene glycol, propylene glycol, and spiroglycol;

[0031] Aralkyldiols such as 1,2-benzenedimethanol, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 1,4-benzenediethanol, 1,3-bis(2-hydroxyethoxy)benzene, 1,4-bis(2-hydroxyethoxy)benzene, 2,3-bis(hydroxymethyl)naphthalene, 1,6-bis(hydroxyethoxy)naphthalene, 4,4'-biphenyldimethanol, 4,4'-biphenyldiethanol, 1,4-bis(2-hydroxyethoxy)biphenyl, bisphenol A bis(2-hydroxyethyl) ether, and bisphenol S bis(2-hydroxyethyl) ether;

[0032] Cyclic ethers such as 1,2-epoxyethane (i.e., ethylene oxide), 1,2-epoxypropane (i.e., propylene oxide), 1,2-epoxycyclopentane, 1,2-epoxycyclohexane, 1,4-epoxycyclohexane, 1-methyl-1,2-epoxycyclohexane, 2,3-epoxynorbornane, and 1,3-epoxypropane; These are some examples.

[0033] Among the monomers used as raw materials for polycarbonate resin, examples of carbonate precursors include carbonyl halides and carbonate esters. Note that one type of carbonate precursor may be used, or two or more types may be used in any combination and ratio.

[0034] Examples of carbonyl halides include, specifically, phosgene; bischloroformates of dihydroxy compounds; monochloroformates of dihydroxy compounds; and other haloformates.

[0035] Examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and dityl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; and carbonates of dihydroxy compounds such as biscarbonates, monocarbonates, and cyclic carbonates of dihydroxy compounds.

[0036] The method for producing polycarbonate resin (a1) is not particularly limited, and any method can be used. Examples include interfacial polymerization, molten transesterification, pyridine method, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers.

[0037] The polycarbonate resin (a1) only needs to have repeating units that constitute a polycarbonate polymer (i.e., a basic structure having a carbonate bond represented by the above formula: -[-OXOC(=O)-]-), and may be a monopolymer or a copolymer. Various copolymerization forms can be selected for the copolymer. Alternatively, it may be a mixture (compound) of two or more types of polycarbonate resins. Specifically, the following (a1) to (a4) can be cited as components of the polycarbonate resin (a1). (a1) Monopolymer consisting of one type of repeating unit that constitutes a polycarbonate polymer (a2) Copolymer having two or more repeating units that constitute a polycarbonate polymer (a3) A copolymer having one or more repeating units that constitute a polycarbonate polymer and one or more repeating units that constitute a structure other than a polycarbonate polymer. (a4) A mixture (compound) of two or more polycarbonate polymers (monopolymers and / or copolymers) with different structures and molecular weights.

[0038] The molecular weight of the polycarbonate resin (a1) is preferably in the range of 16,000 to 50,000 in viscosity-average molecular weight (Mv), more preferably 18,000 or more, even more preferably 20,000 or more, more preferably 45,000 or less, even more preferably 40,000, and particularly preferably 38,000 or less. If the viscosity-average molecular weight is less than 16,000, the impact resistance of the molded article tends to decrease and cracking may occur, which is undesirable. If it is greater than 50,000, the fluidity will be poor and problems with moldability are likely to occur, which is also undesirable.

[0039] Furthermore, the polycarbonate resin (a1) may be a mixture of two or more polycarbonate resins with different viscosity-average molecular weights. In this case, if the viscosity-average molecular weight of the mixture falls within the above-mentioned preferred range, polycarbonate resins with viscosity-average molecular weights outside the above-mentioned preferred range may also be mixed in.

[0040] For example, to improve the appearance and fluidity of the molded article, the polycarbonate resin (a1) may contain a polycarbonate oligomer with a low viscosity-average molecular weight. The viscosity-average molecular weight (Mv) of this polycarbonate oligomer is usually 1500 or more, preferably 2000 or more, and usually 9500 or less, preferably 9000 or less. Furthermore, it is preferable that the amount of polycarbonate oligomer contained is 30% by mass or less of the polycarbonate resin (a1) (including the polycarbonate oligomer).

[0041] In this invention, the viscosity-average molecular weight (Mv) of the polycarbonate resin is determined by using methylene chloride as the solvent, calculating the intrinsic viscosity [η] (unit: dl / g) at a temperature of 20°C using an Ubbelohde viscometer, and then using Schnell's viscosity formula, i.e., η = 1.23 × 10⁻¹⁰ -4 Mv 0.83 This refers to the value calculated from [the formula shown]. Furthermore, the intrinsic viscosity [η] is the value calculated by measuring the specific viscosity [ηsp] at each solution concentration [C] (g / dl) and using the following formula.

[0042]

number

[0043] Examples of copolymers having one or more repeating units constituting a polycarbonate polymer and one or more repeating units constituting a structure other than a polycarbonate polymer include copolymers of a polycarbonate polymer with monomers, oligomers, or polymers that can form thermoplastic polymers other than polycarbonate polymers. For example, a copolymer of a polycarbonate polymer with an oligomer or polymer having a siloxane structure for the purpose of further enhancing flame retardancy and impact resistance; a copolymer of a polycarbonate polymer with a monomer, oligomer, or polymer having a phosphorus atom for the purpose of further improving thermal oxidation stability and flame retardancy; a copolymer of a polycarbonate polymer with a monomer, oligomer, or polymer having a dihydroxyanthraquinone structure for the purpose of improving thermal oxidation stability; a copolymer of a polycarbonate polymer with an oligomer or polymer having an olefin-based structure such as polystyrene for the purpose of improving optical properties; a copolymer of a polycarbonate polymer with a polyester resin oligomer or polymer for the purpose of improving chemical resistance; and so on.

[0044] Furthermore, when the polycarbonate resin (a1) contains repeating units that constitute a structure other than the polycarbonate polymer, the polycarbonate resin (a1) is preferably a copolymer mainly composed of the polycarbonate polymer, and the proportion of the polycarbonate polymer in the polycarbonate resin (a1) is preferably 50 mol% or more, more preferably 60 mol% or more, even more preferably 70 mol% or more, particularly preferably 80 mol% or more, and most preferably 90 mol% or more.

[0045] Furthermore, the polycarbonate resin (a1) may be not only virgin raw material but also polycarbonate resin recycled from used products (so-called material-recycled polycarbonate resin). However, it is preferable that the recycled polycarbonate resin accounts for 80% by mass or less of the polycarbonate resin (a1), and more preferably 50% by mass or less. This is because recycled polycarbonate resin is highly likely to have undergone degradation such as thermal degradation and aging degradation, and using more of such polycarbonate resin than the above range may reduce the hue and mechanical properties.

[0046] Resin (A) may contain resins other than polycarbonate resin (a1), provided that it contains 50% by mass or more of polycarbonate resin (a1). Examples of resins other than polycarbonate resin (a1) include thermoplastic resins such as polystyrene and polyester. These other resins may be blended one or more in any combination and ratio.

[0047] The content of resin (A) in the composition of the present invention is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more. The upper limit is not particularly limited as long as the requirements of the present invention are met, and for example, all components except the colorant (B) may be the resin (A), and the proportion of the resin (A) may be, for example, 99.995% by mass or less. Generally, when the content of resin (A) in the composition of the present invention is above the lower limit, it is easier to obtain a composition with good mechanical strength, transparency, or both.

[0048] [Coloring agent (B)] The composition of the present invention comprises a coloring agent (B), the coloring agent (B) comprising at least a green coloring agent (b1), a red coloring agent (b2), and a blue and / or purple coloring agent (b3).

[0049] In this specification, a blue and / or purple colorant (b3) means a colorant comprising at least one of a blue colorant and a purple colorant. The blue and / or purple colorant (b3) may consist of only one of the blue colorant and the purple colorant, or it may contain both.

[0050] The amount of the coloring agent (B) contained in the composition is 50 ppm parts by mass or more and 500 ppm parts by mass or less (i.e., 0.00005 parts by mass or more and 0.0005 parts by mass or less) per 1.0 part by mass of resin (A) contained in the composition. For example, if the amount of resin (A) in the composition is 1 kg, then the amount of coloring agent (B) is 50 mg to 500 mg. The amount of the coloring agent (B) is preferably 100 ppm parts by mass or more, more preferably 120 ppm parts by mass or more, and even more preferably 140 ppm parts by mass or more, per 1.0 part by mass of resin (A), and can also be 160 ppm parts by mass or more and 180 ppm parts by mass or more to obtain the desired transmittance, preferably 450 ppm parts by mass or less, more preferably 400 ppm parts by mass or less, and even more preferably 350 ppm parts by mass or less. When the content of the coloring agent (B) is above the lower limit, when used in a sensor cover, it is possible to suppress the increase in sensor noise due to excessive transmission of visible light. When it is below the upper limit, when used in a sensor cover, it is possible to obtain a sensor cover in which the inside of the sensor is slightly visible, or the amount of gas generated in the mold during molding tends to decrease, thereby suppressing mold contamination.

[0051] In this specification, the green coloring agent (b1) means a coloring agent whose name includes "Green" in Colour Index International. The aforementioned red colorants (b2) refer to colorants whose names include "Red" in Colour Index International. In the blue and / or purple colorants (b3) mentioned above, the blue colorants and purple colorants refer to colorants whose names in Colour Index International include "Blue" and "Violet," respectively. The yellow-based colorants (b4) described later refer to colorants whose names include "Yellow" or "Brown" in the Colour Index International. The orange-based colorants (b5) described later refer to colorants whose names include "Orange" in Colour Index International. Each of these colorants (b1) to (b5) may be used individually or in combination of two or more.

[0052] The amount of the green coloring agent (b1) contained in the composition is preferably 10 ppm to 200 ppm (i.e., 0.00001 to 0.0002 ppm) per 1.0 part by mass of resin (A) contained in the composition. The amount of the green coloring agent (b1) is preferably 20 ppm or more, more preferably 25 ppm or more, and preferably 150 ppm or less, and more preferably 120 ppm or less, per 1.0 part by mass of resin (A). By having an amount of the green coloring agent (b1) above the lower limit, it is possible to obtain a composition that absorbs light that becomes noise in infrared sensors more effectively by sufficiently absorbing light in the 600 nm to 750 nm range and the surrounding areas, and by having an amount below the upper limit, it is possible to ensure the minimum required transmittance and obtain a composition in which the back side of the molded body can be seen when molded.

[0053] In one embodiment, the content of the red coloring agent (b2) is preferably 0.50 parts by mass or more and 3.5 parts by mass or less, more preferably 0.80 parts by mass or more, even more preferably 1.0 part by mass, even more preferably 3.0 parts by mass or less, and even more preferably 2.5 parts by mass or less, based on 1.0 part by mass of the green coloring agent (b1). In one embodiment, the content of the blue and / or purple coloring agent (b3) is preferably 0.20 parts by mass or more and 2.5 parts by mass or less, more preferably 0.25 parts by mass or more, even more preferably 0.30 parts by mass or more, even more preferably 2.0 parts by mass or less, and even more preferably 1.5 parts by mass or less, per 1.0 part by mass of the green coloring agent (b1). A colorless composition can be obtained by ensuring that the content of the red coloring agent (b2) and the blue and / or purple coloring agent (b3) is within the above range relative to the content of the green coloring agent (b1).

[0054] In one embodiment, the coloring agent (B) may further contain a yellow coloring agent (b4). By including the yellow coloring agent (b4), light in the range of 350 nm to 460 nm and its surroundings can be absorbed. In this case, the content of the yellow coloring agent (b4) is preferably 0.02 parts by mass or more and 2.0 parts by mass or less per 1.0 part by mass of the green coloring agent (b1), more preferably 0.05 parts by mass or more, even more preferably 0.08 parts by mass or more, and also preferably 1.5 parts by mass or less, and more preferably 1.2 parts by mass or less. When the content of the yellow coloring agent (b4) is within the above range, it tends to be easier to obtain an achromatic composition.

[0055] In one embodiment, the coloring agent (B) may further contain an orange-colored coloring agent (b5). In this embodiment, the content of the orange-colored coloring agent (b5) is not particularly limited, but for example, it can be 10 parts by mass ppm or more and 200 parts by mass or less (i.e., 0.00001 parts by mass or more and 0.0002 parts by mass or less) per 1.0 part by mass of resin (A) contained in the composition. The content of the orange-colored coloring agent (b5) is preferably 15 ppm by mass or more, preferably 150 ppm by mass or less, and more preferably 120 ppm by mass or less, per 1.0 part by mass of resin (A). In embodiments in which the coloring agent (B) contains an orange-colored coloring agent (b5), the amount of the orange-colored coloring agent (b5) being within the above range makes it possible to ensure that the transmittance in the 470-510 nm wavelength band and its surrounding wavelengths is neither too high nor too low, thereby securing the minimum necessary transmittance and making it easier to obtain a composition in which the back side of the molded article is visible after molding.

[0056] The type of each coloring agent (B) is not particularly limited as long as it achieves the effects of the present invention, but as the green coloring agent (b1), for example, Solvent green 28, Solvent Green 3, Solvent Green 5, etc. can be used. As the red coloring agent (b2), for example, Solvent Red 52, Solvent Red 179, etc. can be used. As the blue coloring agent, for example, Solvent Blue 97, Solvent Blue 104, Macrolex® blue 3R Gran, etc. can be used. As the purple coloring agent, for example, Solvent Violet 36, Solvent Violet 13, Disperse violet 31, etc. can be used. As the yellow coloring agent (b4), for example, Disperse Yellow 201, Solvent Yellow 163, Solvent Yellow 114, Solvent Yellow 93, etc. can be used. As the orange-colored agent (b5), for example, Solvent Orange 60, Solvent Orange 116, etc. can be used.

[0057] [Infrared absorber (C)] When targeting infrared light with longer wavelengths, the composition of the present invention preferably further contains an infrared absorbent (C). For example, in sensors that utilize infrared light with wavelengths longer than 800 nm, such as 900 nm or 1000 nm, light in the infrared region shorter than the wavelength used becomes noise. In such cases, the noise can be reduced by including an infrared absorbent (C) in the composition. The infrared absorbent (C) can be used as appropriate depending on the wavelength of infrared light to be transmitted. One or more infrared absorbents (C) may be blended in any combination and ratio.

[0058] If you want to reduce the transmittance of light with a wavelength of 700 to 800 nm, it is preferable that the infrared absorber (C) includes an infrared absorber with a maximum absorption wavelength of 700 to 800 nm. The type of infrared absorber with a maximum absorption wavelength of 700 to 800 nm is not limited as long as it does not lose the essence of the present invention, but it is particularly preferable to select and use one with a maximum absorption wavelength in the range of 700 to 800 nm from, for example, quaterylene-based dyes, anthraquinone-based dyes, etc.

[0059] 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.

[0060] Quaterine-based dyes are available commercially, and those with a maximum absorption wavelength in the range of 700-800 nm can be used. For example, DIC's "Spectrasense IR765" (maximum absorption wavelength: 740-790 nm) and "Spectrasense IR788" (maximum absorption wavelength: 760-800 nm) can be selected and used.

[0061] 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 used. For example, PLASiSt's product "NIR-840S" (maximum absorption wavelength: 740-790 nm) can be selected and used.

[0062] If it is desired to reduce the transmittance of light with a wavelength of 700 to 800 nm, it is preferable that the infrared absorber (C) includes an infrared absorber whose maximum absorption wavelength is greater than 800 nm and less than or equal to 900 nm.

[0063] The type of infrared absorber whose maximum absorption wavelength is greater than 800 nm and less than or equal to 900 nm is not limited as long as the essence of the present invention is not lost. For example, condensed polycyclic dyes, phthalocyanine dyes, copper-containing phthalocyanine dyes, nickel complex dyes, polymethine dyes, etc., can be selected and used if their maximum absorption wavelength is in the range of more than 800 nm to 900 nm.

[0064] For example, examples of condensed polycyclic dyes include "SDO-C33" (maximum absorption wavelength: 820-870nm) manufactured by Arimoto Chemical Co., Ltd., an example of a phthalocyanine dye is "IR-14" (maximum absorption wavelength: 810-860nm) manufactured by Nippon Shokubai Co., Ltd., and an example of a copper-containing phthalocyanine dye is "IR-10A" (maximum absorption wavelength: approximately 830-880nm) manufactured by Nippon Shokubai Co., Ltd.

[0065] In the composition of the present invention, the content of the infrared absorbent (C) is preferably 8.0 ppm parts by mass or more and 200 ppm parts by mass or less per 1.0 part by mass of resin (A). More preferably, the content of the infrared absorbent (C) is 10 ppm parts by mass or more, and even more preferably 15 ppm parts by mass or more per 1.0 part by mass of resin (A). Furthermore, the content of the infrared absorbent (C) is more preferably 180 ppm parts by mass or less, even more preferably 150 ppm parts by mass or less, and particularly preferably 100 ppm parts by mass or less per 1.0 part by mass of resin (A). When the content of the infrared absorbent (C) is above the lower limit, near-infrared rays near the target wavelength can be blocked well, and when the content of the infrared absorbent (C) is below the upper limit, the transmittance of the target wavelength band used for sensing can be made good.

[0066] [Other ingredients] The composition of the present invention may contain other additives to the extent that the objectives of the present invention can be achieved. Other additives may include, for example, stabilizers, release agents, ultraviolet absorbers, antioxidants, fluorescent whitening agents, pigments, dyes, flame retardants, impact modifiers, antistatic agents, plasticizers, and compatibilizers. These additives may be blended one or more in any combination and ratio.

[0067] (Stabilizer) The composition of the present invention may contain a stabilizer. Examples of stabilizers include phosphorus-based stabilizers, phenol-based stabilizers, sulfur-based stabilizers, etc. Among these, phosphorus-based stabilizers and / or phenol-based stabilizers are preferred.

[0068] (Phosphorus stabilizer) The composition of the present invention may contain a phosphorus-based stabilizer. The inclusion of a phosphorus-based stabilizer tends to improve the heat resistance and discoloration properties of the composition of the present invention. Any known phosphorus-based stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphinic 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 12 metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; phosphate compounds, phosphite compounds, and phosphonite compounds. Among these, phosphate compounds or phosphite compounds are particularly preferred from the viewpoint of obtaining a composition with high discoloration resistance and continuous productivity.

[0069] Here, the phosphate compound is a pentavalent phosphorus compound represented by the general formula O=P(OR)3, where R represents a monovalent or divalent organic group. When the phosphorus-based stabilizer contains a phosphate compound, each of the three organic groups R may independently be a substituted or unsubstituted aliphatic hydrocarbon group or an aromatic hydrocarbon group, the aliphatic hydrocarbon group may be saturated or unsaturated, and each of the three organic groups R may independently have some carbon atoms substituted with heteroatoms such as oxygen, nitrogen, sulfur, or phosphorus.

[0070] The number of carbon atoms in the three organic groups R is usually 2 or more, preferably 3 or more, more preferably 5 or more, and usually 20 or less, preferably 15 or less, more preferably 12 or less.

[0071] Preferably, one or more of the three organic groups R are aromatic hydrocarbon groups, more preferably two or more, and even more preferably all three are aromatic hydrocarbon groups.

[0072] If one or more of the three organic groups R include an aromatic hydrocarbon group, the aromatic hydrocarbon group preferably includes one or more selected from the group consisting of a tert-butylphenyl group, a cresyl group, and a phenyl group.

[0073] In a particularly preferred embodiment, the phosphate compound comprises one or more selected from the group consisting of tris(4-tert-butylphenyl) phosphate, tris(2,4-di-tert-butylphenyl) phosphate, tricresyl phosphate, and triphenyl phosphate, and more preferably comprises either tris(4-tert-butylphenyl) phosphate or tris(2,4-di-tert-butylphenyl) phosphate.

[0074] Furthermore, the phosphite compound is a trivalent phosphorus compound represented by the general formula: P(OR)3, where R represents a monovalent or divalent organic group. The preferred embodiment of R is the same as that of the phosphate compound described above. Examples of such 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, distearylpentaerythritol diphosphite, bis(2,4- Examples include di-tert-butyl-4-methylphenyl)pentaerythritol phosphite, bis(2,6-di-tert-butylphenyl)octyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene-diphosphite, and 6-[3-(3-tert-butyl-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]-dioxaphosfepine.

[0075] Among such phosphite compounds, aromatic phosphite compounds represented by the following general formula (II) or (III) are more preferred because they tend to effectively enhance the heat-resistant discoloration of the composition of the present invention.

[0076] [ka]

[0077] In formula (II), R 20 , R 21 and R 22 These may be the same or different. This represents an aryl group with 6 to 30 carbon atoms.

[0078] [Chem.]]

[0079] In formula (III), R 23 and R 24 may each be the same or different, and represent an aryl group having 6 to 30 carbon atoms.

[0080] As the phosphite compound represented by the above formula (II), triphenyl phosphite, tris(monononylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite and the like are preferred among others, and tris(2,4-di-tert-butylphenyl) phosphite is more preferred.

[0081] As the phosphite compound represented by the above formula (III), those having a pentaerythritol diphosphite structure such as bis(2,4-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite are particularly preferred.

[0082] Specific examples thereof include "ADEKA STAB (Registered Trademark) 1178" and "ADEKA STAB (Registered Trademark) 2112" manufactured by ADEKA, "JP-351", "JP-360" and "JP-3CP" manufactured by Johoku Chemical Industry Co., Ltd., and "Irgafos (Registered Trademark) 168" manufactured by BASF.

[0083] When a phosphorus-based stabilizer is included, the content of the phosphorus-based stabilizer in the composition is preferably 0.01 to 0.5% by mass. More preferably 0.02% by mass or more, even more preferably 0.03% by mass or more, even more preferably 0.4% by mass or less, even more preferably 0.3% by mass or less, and even more preferably 0.2% by mass or less. If the content of the phosphorus-based stabilizer is less than 0.01% by mass, the heat resistance to discoloration may be insufficient, and if it exceeds 0.5% by mass, it will be an excessive amount and tend to worsen economic efficiency. Note that one type of phosphorus-based stabilizer may be included, or two or more types may be included in any combination and ratio.

[0084] (Phenol-based stabilizers) The composition of the present invention may contain a phenolic stabilizer. Examples of phenolic stabilizers include hindered phenolic antioxidants. Specific examples 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-hydroxyphenylpropionamide), 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphoate, 3,3',3”,5,5',5”-hexa-tert-butyl-a,a',a”-(mesitylene-2,4,6- Examples include triyl)tri-p-cresol, 4,6-bis(octylthiomethyl)-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.

[0085] 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 phenolic antioxidants include, for example, BASF's "Irganox® 1010" and "Irganox® 1076," and ADEKA's "ADEKA Stab® AO-50" and "ADEKA Stab® AO-60."

[0086] When a phenolic stabilizer is included, the content of the phenolic stabilizer in the composition is preferably 0.01 to 0.5% by mass. More preferably 0.03% by mass or more, even more preferably 0.05% by mass or more, even more preferably 0.07% by mass or more, and even more preferably 0.4% by mass or less, even more preferably 0.3% by mass or less, even more preferably 0.2% by mass or less, and particularly preferably 0.15% by mass or less. By having a phenolic stabilizer content above the lower limit, good antioxidant function can be obtained, and by having a content below the upper limit, a decrease in economic efficiency due to the addition of an excessive amount can be prevented. Note that one type of phenolic stabilizer may be included, or two or more types may be included in any combination and ratio.

[0087] (Release agent) The composition of the present invention may contain a release agent. Examples of release agents include aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, and polysiloxane-based silicone oils.

[0088] Examples of aliphatic carboxylic acids include saturated or unsaturated aliphatic monovalent, divalent, or trivalent carboxylic acids. Here, aliphatic carboxylic acids also include alicyclic carboxylic acids. Among these, preferred aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and more preferably aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid, montanic acid, adipic acid, and azelaic acid.

[0089] As the aliphatic carboxylic acid in the ester of an aliphatic carboxylic acid and an alcohol, for example, the same aliphatic carboxylic acid as described above can be used. On the other hand, as the alcohol, for example, saturated or unsaturated monohydric or polyhydric alcohols can be used. These alcohols may have substituents such as fluorine atoms or aryl groups. Among these, monohydric or polyhydric saturated alcohols with 30 or fewer carbon atoms are preferred, and aliphatic saturated monohydric alcohols or aliphatic saturated polyhydric alcohols with 30 or fewer carbon atoms are more preferred. Here, aliphatic includes alicyclic compounds. Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, and dipentaerythritol.

[0090] Furthermore, the above esters may contain aliphatic carboxylic acids and / or alcohols as impurities. Also, the above esters may be pure substances or mixtures of multiple compounds. Moreover, the aliphatic carboxylic acids and alcohols that combine to form a single ester may be used individually, or two or more may be used in any combination and ratio.

[0091] Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture mainly composed of myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

[0092] Examples of aliphatic hydrocarbons with a number-average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomers having 3 to 12 carbon atoms. Note that alicyclic hydrocarbons are also included as aliphatic hydrocarbons. These hydrocarbons may also be partially oxidized. The number-average molecular weight is preferably 5,000 or less. The aliphatic hydrocarbon may be a single substance, but a mixture of substances with various components and molecular weights can also be used as long as the main component is within the above range.

[0093] Among these, paraffin wax, polyethylene wax, or partially oxided polyethylene wax are preferred, paraffin wax and polyethylene wax are more preferred, and polyethylene wax is particularly preferred.

[0094] The release agent content is preferably 0.1 parts by mass or more, usually 3.0 parts by mass or less, and preferably 2.5 parts by mass or less, per 100 parts by mass of resin (A). A release agent content above the lower limit allows for good release agent effectiveness, while a content below the upper limit tends to reduce gas generation during molding and suppress mold contamination. The release agent may be one type, or two or more types may be included in any combination and ratio.

[0095] [UV absorber] The composition of the present invention may contain an ultraviolet absorber. Examples of ultraviolet absorbers include inorganic ultraviolet absorbers such as cerium oxide and zinc oxide; and organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic acid ester compounds, and hindered amine compounds. Of these, organic ultraviolet absorbers are preferred, and benzotriazole compounds are more preferred. By selecting an organic ultraviolet absorber, good mechanical properties are obtained.

[0096] 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-amyl)-benzotriazole. Examples include azoles, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, and 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol], among which 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol] and 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole are preferred, with 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol] being particularly preferred.

[0097] Examples of compounds other than benzotriazole compounds include, for example, 2,2'-dihydroxy-4-methoxybenzophenone and 2,2'-dihydroxy-4,4'-methoxybenzophenone as benzophenone compounds, and for example, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine as a triazine compound.

[0098] If an ultraviolet absorber is included, the amount is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, per 100 parts by mass of resin (A), and the upper limit is preferably 1.5 parts by mass or less, more preferably 1.0 part by mass or less. Note that one type of ultraviolet absorber may be included, or two or more types may be included in any combination and ratio.

[0099] <Total light transmittance of the composition> The composition of the present invention, when molded to a thickness of 2 mm and its light transmittance is measured, yields the maximum value of total light transmittance (T) for light with wavelengths of 800 nm to 1100 nm. max:800-1100 The ratio is 85% or more. Using such a composition makes it suitable for sensor covers of sensors that utilize light near the wavelength of the maximum total light transmittance.

[0100] The maximum value of the total light transmittance (T max:800-1100 The maximum value of the total light transmittance (T) is preferably 86% or more, more preferably 88% or more, and even more preferably 90% or more, with no particular upper limit. max:800-1100 The higher the value, the better the infrared light is transmitted, and the better the sensitivity of the sensor when used in an infrared sensor cover.

[0101] When the composition of the present invention is molded to a thickness of 2 mm and its light transmittance is measured, the average value of the total light transmittance for light with wavelengths of 450 nm to 700 nm (T ave:450-700 It is preferable that the average value of the total light transmittance (T ave:450-700) is more preferably 3.0% or more, even more preferably 4.0% or more, and more preferably 50% or less, even more preferably 45% or less, particularly preferably 40% or less, and very preferably 35% or less. The average value of the total light transmittance (T ave:450-700 If the value is above the lower limit, it ensures that some of the transmitted light is transmitted, and if it is below the upper limit, it can reduce sensor noise caused by excessive transmission of visible light.

[0102] Furthermore, the total light transmittance (T) for light with wavelengths between 450 nm and 700 nm is also calculated. all:450-700 The total light transmittance (T) is preferably 2.0% to 60%. That is, it is preferable that the total light transmittance in the wavelength range of 450 to 700 nm is 2.0% to 6.0%. all:450-700 A more preferred range is the average value of the total light transmittance (T ave:450-700 ) is the same as the total light transmittance (T all:450-700 When the value of ) is within the above range, it tends to be easier to obtain achromatic compositions.

[0103] Specifically, the total light transmittance can be measured using a spectrophotometer with an integrating sphere, using a 2 mm thick portion of the sample prepared by molding the composition of the present invention into a flat plate-shaped molded body with a thickness of 2 mm in part or in whole. In this specification, the total light transmittance can be measured for visible light, for example, by a method conforming to JIS-K7361-1, and for ultraviolet and infrared light, it can be measured in the same way as for visible light, except that a spectrophotometer corresponding to ultraviolet and infrared wavelengths is used and the irradiated wavelength is ultraviolet or infrared. An example of specific conditions for the measurement method is described in the examples.

[0104] When the composition of the present invention is molded to a thickness of 1 mm, L * C * In the h color space, saturation C * The value is preferably 15.0 or less. *The value is more preferably 14.0 or less, even more preferably 13.5 or less, particularly preferably 13.0 or less, and most preferably 12.0 or less. There is no particular lower limit; lower is preferable, but it is usually 0.0 or higher. (Referring to the saturation C) * If the value is below the above upper limit, a colorless composition can be obtained.

[0105] L * C * In the h color space, saturation C * Specifically, La * b * a in color space * value, b * Using the value, C * ={(a * ) 2 +(b * ) 2 )} (0.5) It is calculated from the formula a. * value, b * The value can be measured using a flat plate-shaped molded body formed from the composition of the present invention, with a thickness of 1 mm in part or in whole, as the measurement sample. The 1 mm thick portion of the sample is used, for example, with a spectroscopic haze meter, in accordance with the method compliant with JIS Z8781-4:2013. An example of specific conditions for the measurement method is described in the examples.

[0106] In one embodiment, when the composition of the present invention is molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance (T) for light with wavelengths of 800 nm to 1100 nm is measured. all:800-1100 The composition (hereinafter referred to as "composition (α)") may be one in which the total light transmittance (T) is 85% or more. all:800-1100 The percentage is preferably 86% or more, more preferably 88% or more, and even more preferably 90% or more, with no particular upper limit. A preferred form of the total light transmittance and its average value for light with wavelengths of 450 nm to 700 nm of composition (α) is the total light transmittance (T all:450-700 ), the average value of the total light transmittance (T ave:450-700 It is the same as ). Composition (α) is suitable as a sensor with a target wavelength of 800 nm to 1100 nm or 800 nm to 900 nm.

[0107] In another embodiment, when the composition of the present invention is molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance (T) for light with wavelengths of 700 nm to 800 nm is measured. all:700-800 ) is 60% or less, and the total light transmittance (T) for light with wavelengths of 900nm to 1100nm is 60% or less. all:900-1100 The composition may be one in which ) makes up 85% or more (hereinafter referred to as "composition (β)"). The total light transmittance (T) of composition (β) all:900-1100 The percentage is preferably 86% or more, more preferably 88% or more, and even more preferably 90% or more, with no particular upper limit. The total light transmittance (T) of composition (β) all:700-800 The percentage of the active ingredient is preferably 60% or less, more preferably 50% or less, even more preferably 40% or less, and also preferably 2.0% or more, more preferably 5.0% or more, and even more preferably 8.0% or more. A preferred form of the total light transmittance of composition (β) for light with wavelengths of 450 nm to 700 nm and its average value is the total light transmittance (T all:450-700 ), the average value of the total light transmittance (T ave:450-700 It is the same as ). Composition (β) is suitable as a sensor with a target wavelength of 900 nm to 1100 nm.

[0108] In another embodiment, when the composition of the present invention is molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance (T) for light with wavelengths of 700 nm to 900 nm is measured. all:700-900 ) is 60% or less, and the total light transmittance (T) for light with wavelengths of 1000 nm to 1100 nm is 60% or less. all:1000-1100 The composition may be one in which ) makes up 85% or more (hereinafter referred to as "composition (γ)"). The total light transmittance (T) of composition (γ) all:1000-1100The percentage is preferably 86% or more, more preferably 88% or more, and even more preferably 90% or more, with no particular upper limit. The total light transmittance (T) of composition (γ) all:700-900 The percentage of the active ingredient is preferably 60% or less, more preferably 50% or less, even more preferably 40% or less, and also preferably 2.0% or more, more preferably 5.0% or more, and even more preferably 8.0% or more. A preferred form of the total light transmittance of composition (γ) for light with wavelengths of 450 nm to 700 nm and its average value is the total light transmittance (T all:450-700 ), the average value of the total light transmittance (T ave:450-700 It is the same as ). Composition (γ) is suitable as a sensor with a target wavelength of 1000 nm to 1100 nm.

[0109] <Method for producing the composition> There are no limitations on the method of producing the composition of the present invention, and a wide range of known methods for producing polycarbonate compositions can be employed. For example, a method may be used in which a resin (A) containing polycarbonate resin (a1), a colorant (B), an infrared absorber (C) and other components, which are optionally added, are pre-mixed using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, braver, single-screw extruder, twin-screw extruder, or kneader. When a colorant (B) is added, it is generally added in the form of a masterbatch that has been pre-mixed with the resin (A) containing polycarbonate resin (a1). The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0110] The composition of the present invention can typically be pelletized and then molded using various molding methods to produce various molded articles. Alternatively, the resin, which is melt-kneaded in an extruder, can be directly molded into an article without going through the pellet stage.

[0111] <Molded body> The molded articles obtained from the composition of the present invention effectively block visible light and have high transmittance at 940 nm, making them suitable for use as infrared sensor components in the automotive, office automation equipment, home appliance, and electrical / electronic fields. For example, they can be used in products such as: monitoring stores, houses, facilities, train stations, and airports; access control and personal authentication; disaster prevention purposes such as monitoring road disasters (landslides, etc.), dam water levels, and active volcanoes; traffic flow monitoring, automatic speed enforcement devices, and automatic license plate recognition devices; in the automotive field, driver face orientation recognition, occupant monitoring devices, driver monitoring devices, 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. In particular, the molded article of the present invention can be suitably used as a component for an infrared sensor that utilizes infrared light in the 800nm ​​to 1100nm range. [Examples]

[0112] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples unless its essence is changed.

[0113] 1. Raw Materials: The ingredients listed in Table 1 were used as raw materials.

[0114] [Table 1]

[0115] <Examples 1-12, Comparative Example 1> 2.1. Preparation of the composition Each component listed in Table 1 was blended in the proportions shown in Tables 2 and 3 below, mixed in a tumbler for 20 minutes, and then melt-kneaded using a twin-screw extruder (Shibaura Machinery Co., Ltd. "TEM-26SS") at 280°C and a discharge rate of 25 kg / h. The mixture was then cut into strands to obtain pellets of the compositions according to Examples 1 to 12 and Comparative Example 1.

[0116] 2.2. Molding Each of the obtained pellets was dried at 120°C for 5 hours in a hot air circulating dryer. Then, using an injection molding machine (Shibaura Machinery Co., Ltd. "EC50SXII"), stepped, flat test pieces were obtained with an extrusion temperature of 290°C and a mold temperature of 80°C, each having an area of ​​90 × 60 mm and thicknesses of 1 mm, 2 mm, and 3 mm.

[0117] <Comparative Example 2> A flat test piece according to Comparative Example 2 was obtained in the same manner as in Example 1, except that pellets of the polycarbonate resin composition "Xantar(registered trademark) KH3310UR / 75FQNS" manufactured by Mitsubishi Chemical Corporation were used instead of the pellets obtained in the production of the composition described in 2.1 above.

[0118] <Comparative Example 3> A flat test piece according to Comparative Example 3 was obtained in the same manner as in Example 1, except that pellets of the polycarbonate resin composition "Xantar(registered trademark) KH3310UR / 75KMNS" manufactured by Mitsubishi Chemical Corporation were used instead of the pellets obtained in the production of the composition described in 2.1 above.

[0119] [Table 2]

[0120] [Table 3]

[0121] 3. Evaluation 3.1. Measurement of Optical Properties In the 2 mm thick portions of the test specimens obtained from the production of each of the above compositions, the total light transmittance at wavelengths from 300 nm to 2000 nm was measured in 2 nm increments using an ultraviolet-visible-near-infrared spectrophotometer (Shimadzu Corporation "UV-3100PC"). Figures 1 to 5 show the transmission spectra in the range of 350 to 1100 nm. Figures 6 to 10 show the transmission spectra in the range of 400 to 800 nm. Furthermore, Tables 4 and 5 show the total light transmittance for light at 450 nm, 550 nm, 650 nm, 700 nm, 750 nm, 800 nm, 900 nm, 1000 nm, and 1100 nm. In addition, the average value of the total light transmittance in the range of 450 nm to 700 nm is shown in Tables 4 and 5 as the "Visible Light Average" item of the total light transmittance.

[0122] 3.2. Evaluation of Noise Blocking Performance Using test specimens from each example and comparative example, the ability to block noise when used as an infrared sensor cover was evaluated by the following method. In the 2mm thick section, materials with a total light transmittance of 700nm wavelength light, which can be a source of noise, were evaluated as "×" if greater than 60%, "△" if greater than 40% but less than or equal to 60%, and "○" if less than or equal to 40%. The results are shown in Tables 4 and 5.

[0123] 3.3. Evaluation of Visible Light Transmittance For each example and comparative example, the 2mm thick portion of the test specimen was visually inspected to see if the back side of the molded body was visible. Those where the back side was visible were rated "○", those where it was difficult to see were rated "△", and those where the back side was not visible were rated "×". The results are shown in Tables 4 and 5.

[0124] As can be seen from Tables 4 and 5, the test specimens for Examples 1 to 12 all achieved both noise suppression and visible light transmission, but the test specimens for Comparative Examples 1 to 3 were found to fail to satisfy either visible light transmission or noise suppression.

[0125] 3.4. Evaluation of Color In the 1 mm thick portion of the test specimens for Examples 1 to 12, La was measured using a spectroscopic haze meter (SH 7000, manufactured by Nippon Denshoku Industries Co., Ltd.). * b * a in color space * value, b * Identify the value, LC * C in h color space * The value is {(a* ) 2 +(b * ) 2 )} (0.5) This was determined from the value of C * Colors with a value of 15.0 or less were classified as "achromatic," and those with a value greater than 15.0 were classified as "chromatic." The results are shown in Tables 4 and 5.

[0126] [Table 4]

[0127] [Table 5]

[0128] In each example, the test specimens transmitted infrared light well, and the total light transmittance for light with wavelengths between 450 nm and 700 nm was neither too high nor too low. This demonstrates that a composition can be provided that partially transmits visible light and reduces infrared noise. Furthermore, it can be seen that Examples 5 to 12 satisfy the above conditions and are also achromatic.

[0129] As described above, the present invention provides a composition that has good light transmittance in the wavelength band used in infrared sensors, partially transmits visible light, and effectively suppresses noise, as well as a molded article containing the composition and an optical filter for infrared sensors.

Claims

1. The composition comprises a resin (A) and a coloring agent (B). The aforementioned resin (A) contains 50% by mass or more of polycarbonate resin (a1), The coloring agent (B) comprises at least a green coloring agent (b1), a red coloring agent (b2), and a blue and / or purple coloring agent (b3). The content of the coloring agent (B) is 50 ppm parts by mass or more and 500 ppm parts by mass or less per 1.0 part by mass of the resin (A). A composition in which, when molded to a thickness of 2 mm and its light transmittance is measured, the maximum value of the total light transmittance for light with wavelengths of 800 nm to 1100 nm is 85% or more.

2. The content of the red coloring agent (b2) is 0.50 parts by mass or more and 3.5 parts by mass or less per 1.0 part by mass of the green coloring agent (b1). The composition according to claim 1, wherein the content of the blue and / or purple coloring agent (b3) is 0.20 parts by mass or more and 2.5 parts by mass or less per 1.0 part by mass of the green coloring agent (b1).

3. The coloring agent (B) further comprises a yellow coloring agent (b4), The composition according to claim 1, wherein the content of the yellow coloring agent (b4) is 0.02 parts by mass or more and 2.0 parts by mass or less per 1.0 part by mass of the green coloring agent (b1).

4. The composition according to claim 1, wherein the content of the green coloring agent (b1) is 10 ppm parts by mass or more and 200 ppm parts by mass or less per 1.0 part by mass of resin (A) contained in the composition.

5. The composition according to claim 1, wherein the coloring agent (B) further comprises an orange-colored coloring agent (b5).

6. The composition according to claim 1, wherein when molded to a thickness of 2 mm and its light transmittance is measured, the average value of the total light transmittance for light with wavelengths of 450 nm to 700 nm is 2.0% to 60%.

7. The composition according to claim 1, wherein when molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with a wavelength of 450 nm to 700 nm is 2.0% to 60%.

8. When molded to a thickness of 1 mm, L * C * In the h color space, the saturation C * The composition according to claim 1, wherein the value is 15.0 or less.

9. The composition according to claim 1, further comprising an infrared absorber (C).

10. The composition according to claim 1, wherein when molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with wavelengths of 800 nm to 1100 nm is 85% or more.

11. The composition according to claim 1, wherein, when molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with a wavelength of 700 nm to 800 nm is 60% or less, and the total light transmittance for light with a wavelength of 900 nm to 1100 nm is 85% or more.

12. The composition according to claim 1, wherein, when molded to a thickness of 2 mm and its light transmittance is measured, the total light transmittance for light with a wavelength of 700 nm to 900 nm is 60% or less, and the total light transmittance for light with a wavelength of 1000 nm to 1100 nm is 85% or more.

13. A molded article comprising the composition according to any one of claims 1 to 12.

14. An optical filter for an infrared sensor, comprising the molded body described in claim 13.

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