Thermoplastic resin composition and optical component using the same

Abstract

A thermoplastic resin composition that blocks visible light and transmits infrared light. The thermoplastic resin composition contains a thermoplastic resin and a colorant, and when the thermoplastic resin composition has a refractive index of 1.60 or more at a wavelength of 894 nm and a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is more than 0% and not more than 1.00%, and the average transmittance at wavelengths of 840 nm to 940 nm is 80% or more.

Description

[Technical Field]

[0001] The present invention relates to thermoplastic resin compositions, more particularly to thermoplastic resin compositions containing a high refractive index material, and to optical lenses using the thermoplastic resin composition. [Background technology]

[0002] Infrared cameras and infrared sensors visualize the infrared radiation emitted from an object as a change in its temperature, and offer greater operational stability in dark environments compared to detection using visible light. Infrared cameras and infrared sensors are widely used in medical diagnostics, non-destructive testing to detect deterioration in buildings and electrical equipment, night vision cameras in the security sector, and personal authentication such as biometric cameras in ATMs at financial institutions and airports.

[0003] Generally, infrared cameras and infrared sensors incorporate semiconductors such as silicon semiconductors to detect infrared radiation. However, such semiconductors detect not only infrared radiation but also visible light. Therefore, the materials used in lenses for infrared cameras / sensors must have the properties of detecting infrared radiation while simultaneously blocking visible light.

[0004] Conventionally, optical glass or optical resins have been used as materials for optical elements in the optical systems of various cameras, such as cameras, film cameras, and video cameras. Among these, visible light-cutting materials such as bisphenol A polycarbonate are known as optical resins that detect infrared rays and cut visible light, and are used in infrared transmission filters, etc. (Patent Documents 1-3).

[0005] However, thermoplastic resin compositions containing high refractive index materials, and optical lenses using such thermoplastic resin compositions, are not known. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 55-62410 [Patent Document 2] International Publication No. 2015 / 056734 [Patent Document 3] Special Publication No. 62-53801 [Overview of the project] [Problems that the invention aims to solve]

[0007] As a material that cuts visible light and transmits infrared light, there is a need for the development of thermoplastic resin compositions containing high refractive index materials, and optical lenses using such resin compositions. [Means for solving the problem]

[0008] As a result of diligent research, the inventors have developed a thermoplastic resin composition containing a thermoplastic resin and a colorant as an optical lens material that cuts visible light and transmits infrared light, thereby completing the present invention.

[0009] In other words, the present invention includes the following embodiments.

[0010] (1) A thermoplastic resin composition comprising a thermoplastic resin and a colorant, The refractive index at a wavelength of 894 nm is 1.60 or higher. In the thermoplastic resin composition with a thickness of 1 mm, the maximum transmittance in the wavelength range of 380 nm to 630 nm is greater than 0% and less than or equal to 1.00%, and the average transmittance in the wavelength range of 840 nm to 940 nm is 80% or more. Thermoplastic resin composition.

[0011] (2) The thermoplastic resin composition according to (1) above, wherein the thermoplastic resin comprises a resin selected from the group consisting of polycarbonate resin, polyester resin, and polyester carbonate resin.

[0012] (3) The thermoplastic resin contains, as a monomer, a diol compound selected from the group consisting of compounds represented by the following general formula (I), general formula (II), and general formula (III), and is the thermoplastic resin composition according to (2) above.

Chemical formula

Chemical formula

Chemical formula

Chemical formula

[0013] (4) The thermoplastic resin composition according to any one of (1) to (3) above, wherein the colorant comprises at least one of green pigment, red pigment, yellow pigment, and purple pigment.

[0014] (5) The thermoplastic resin composition according to any one of (1) to (3) above, wherein the colorant comprises at least one of anthraquinone pigments, perinone pigments, methine pigments, isoindoline pigments, phthalocyanine pigments, quinacridone pigments, azo pigments, and lake pigments.

[0015] (6) The thermoplastic resin composition according to any one of (1) to (5) above, wherein the thermoplastic resin composition has a thickness of 1 mm and the maximum transmittance in the wavelength range of 380 nm to 630 nm is greater than 0% and 0.8% or less.

[0016] (7) The thermoplastic resin composition according to any one of (1) to (6) above, wherein the thermoplastic resin composition has a thickness of 1 mm and the maximum transmittance in the wavelength range of 380 nm to 630 nm is greater than 0% and 0.5% or less.

[0017] (8) An optical lens comprising the thermoplastic resin composition described in any of (1) to (7) above.

[0018] (9) A lens for an infrared camera comprising any of the thermoplastic resin compositions described in (1) to (7) above.

[0019] (10) A lens for a biometric camera comprising the thermoplastic resin composition described in any of (1) to (7) above. [Effects of the Invention]

[0020] The thermoplastic resin composition containing the high refractive index material of the present invention has infrared transmittance and cuts visible light, thereby reducing noise originating from visible light. Therefore, optical lenses using the thermoplastic resin composition of the present invention can improve the image accuracy of infrared cameras and infrared sensors. Furthermore, by using the thermoplastic resin composition of the present invention in optical lenses, it is possible to increase the power of the optical lenses and reduce the number of lenses. Moreover, compared to methods that cut visible light, such as infrared transmission filters, it is possible to eliminate the need for filters, thus reducing the number of parts and achieving a lower profile. [Modes for carrying out the invention]

[0021] The present invention will be described in detail below.

[0022] 1.Thermoplastic resin composition The present invention provides a thermoplastic resin composition comprising a thermoplastic resin and a colorant.

[0023] (A) Thermoplastic resin In one embodiment of the present invention, the thermoplastic resin that can be used in the thermoplastic resin composition may include, but is not limited to, polycarbonate resin, polyester resin, and polyester carbonate resin. In a preferred embodiment of the present invention, the thermoplastic resin composition is a polycarbonate resin.

[0024] In one embodiment of the present invention, the thermoplastic resin that can be used in the thermoplastic resin composition may include, as a monomer, a diol compound selected from the group consisting of compounds represented by the following general formulas (I), (II), and (III).

[0025] [ka] (In general formula (I), R1 to R4 each independently represent a C6 to C20 aryl group, a C2 to C6 alkenyl group, a C1 to C6 alkoxy group, or a C7 to C17 aralkyl group, which may contain a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1 to C6 alkyl group, or a heterocyclic atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom. p, q, r, and s each independently represent integers from 0 to 4. R is [ka] And, Here, i represents an integer from 0 to 10, ii represents an integer from 1 to 10, and iii represents an integer from 1 to 10.

[0026] [ka] (In general formula (II), R6 and R7 are synonymous with R1-R4. n and m represent integers from 0 to 5. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10.

[0027] [ka] (In general formula (III), R8 and R9 are synonymous with R1-R4. a and b represent integers from 0 to 4. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10.

[0028] Specifically, the monomer represented by the above general formula (I) includes 9,9-bis(4-hydroxy-3-ethylphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene, 9,9-bis[4-(2-hydroxyethoxy)-3-methylphenyl]fluorene, 9,9-bis[4-(2-hydroxyethoxy)-3-tert-butylphenyl]fluorene, and 9,9-bis[4- Examples include, but are not limited to, [(2-hydroxyethoxy)-3-isopropylphenyl]fluorene, 9,9-bis[4-(2-hydroxyethoxy)-3-cyclohexylphenyl]fluorene, 9,9-bis[4-(2-hydroxyethoxy)-3-phenylphenyl]fluorene, 4-(9-(4-hydroxyethoxy)phenyl)-9H-fluoren-9-yl)phenol, 2,2'(9H-fluoren-9,9'-diyl)bis(ethane-1-ol), 9H-fluoren-9,9-diyl)dimethanol, etc. These monomers may be used individually or in combination of two or more.

[0029] Among the monomers represented by the above general formula (I), 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene, 9,9-bis[4-(2-hydroxyethoxy)-3-phenylphenyl]fluorene, and 9,9-bis[4-(2-hydroxy)phenyl]fluorene are preferred, and 9,9-bis[4-(2-hydroxyethoxy)-3-phenylphenyl]fluorene are more preferred.

[0030] Specifically, the monomers represented by the above general formula (II) include 2,2'-bis(1-hydroxymethoxy)-1,1'-binaphthalene, 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (also known as "BHEBN"), 2,2'-bis(3-hydroxypropyloxy)-1,1'-binaphthalene, 2,2'-bis(4-hydroxybutoxy)-1,1'-binaphthalene, 2,2'-bis(2-hydroxyethoxy)-6,6'-diphenyl-1,1'-binaphthalene (also known as "BINL-2EO"), and 9,9-bis(6- (2-hydroxyethoxy)naphthalen-2-yl)fluorene (also known as "BNEF"), 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (also known as "BNE"), 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene (also known as "BPEF"), 9,9-bis(4-(2-hydroxyethoxy)-3-phenylphenyl)fluorene (also known as "BPPEF"), 2,2'-bis(2-hydroxyethoxy)-6,6'-di(naphthalen-1-yl)-1,1'-binaphthalene ("DNBINOL") 6,6'-Di-(3-cyanophenyl)-2,2'-Bis(2-hydroxyethoxy)-1,1'-Binaphthalene (also known as "2DNBINOL-2EO"), 2,2'-Bis(2-hydroxyethoxy)-6,6'-Di(phenanthrene-9-yl)-1,1'-Binaphthalene (also known as "9DPNBINOL-2EO"), 6,6'-Di-(3-cyanophenyl)-2,2'-Bis(2-hydroxyethoxy)-1,1'-Binaphthalene (also known as "CN-BNA"), 6,6'-Di-(dibenzo[b,d]furan) -4-yl)-2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (also known as "FUR-BNA"), 6,6'-di-(dibenzo[b,d]thien-4-yl)-2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (also known as "THI-BNA"), 2,2'-bis(2-hydroxyethoxy)-6,6'-di(naphthalene-2-ylethynyl)-1,1'-binaphthalene (also known as "D2NACBHBNA"), 2,2'-bis(2-hydroxyethoxy)-6,6'-di(phenylethynyl)-1,Examples include, but are not limited to, 1'-binaphthalene (also known as "DPACBHBNA"). Among the monomers represented by the above general formula (II), 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene is preferred.

[0031] Examples of monomers represented by the above general formula (III) include, but are not limited to, 9,9-bis[6-(1-hydroxymethoxy)naphthalen-2-yl]fluorene, 9,9-bis[6-(2-hydroxyethoxy)naphthalen-2-yl]fluorene, 9,9-bis[6-(3-hydroxypropoxy)naphthalen-2-yl]fluorene, and 9,9-bis[6-(4-hydroxybutoxy)naphthalen-2-yl]fluorene. Among the monomers represented by the above general formula (III), 9,9-bis[6-(2-hydroxyethoxy)naphthalen-2-yl]fluorene is preferred.

[0032] In one embodiment of the present invention, the thermoplastic resin may be a monopolymer resin made using only one diol compound selected from the group consisting of compounds represented by the above general formulas (I), (II), and (III) as a monomer, or it may be a binary resin made using two types, or a ternary resin made using three types, or a quaternary resin made using four types. Alternatively, in one embodiment of the present invention, the thermoplastic resin may be a blend of two or more resins from the above monopolymer resins, binary resins, ternary resins, and quaternary resins.

[0033] In one embodiment of the present invention, the thermoplastic resin may include, as a monomer, other diol compounds other than those selected from the group consisting of compounds represented by the above general formulas (I), (II), and (III). Other diol compounds include, for example, 4,4'-biphenyldiol, bis(4-hydroxyphenyl)methane, bis(2-hydroxyphenyl)methane, 2,4'-dihydroxydiphenylmethane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, 2,4'-dihydroxydiphenylsulfone, bis(2-hydroxyphenyl)sulfone, bis(4-hydroxy-3-methylphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl)diphenylmethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxy-3-methylphenyl)ethane, bis(4-hydroxy-3-methylphenyl) Nyl)methane, 2,2-bis(4-hydroxy-3-t-butylphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)cycloundecane, 1,1-bis(4-hydroxyphenyl)cyclododecane, 2,2-bis(4-hydroxy-3-allylphenyl)propane, 3,3,5-trimethyl-1,1 -Bis(4-hydroxyphenyl)cyclohexane, α,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethyldiphenyl random copolymer siloxane, α,ω-bis[3-(o-hydroxyphenyl)propyl]polydimethylsiloxane, 4,4'-[1,4-phenylenebis(1-methylethylidene)]bisphenol, 4,4'-[1,3-phenylenebis(1-methylethylidene)]bisphenol, adamantane, 2,2-bis(4-hydroxyphenyl)butane, 1,1-Bis(4-hydroxyphenyl)-2-ethylhexane, 1,1-Bis(4-hydroxyphenyl)-2-methylpropane, 2,2-Bis(4-hydroxyphenyl)-4-methylpentane, 1,1-Bis(4-hydroxyphenyl)decane, 1,3-Bis(4-hydroxyphenyl)-5,7-dimethyladamantane, 2,2-Bis(4-(2-hydroxyethoxy)phenyl)propane, 4,4-Bis(2-hydroxyethoxy)biphenyl, 2,2'-( 1,4-phenylene)bis(ethane-1-ol), 2,2'-(1,4-phenylene)bis(methane-1-ol), 2,2'-(1,4-phenylenebis(oxy))bis(ethane-1-ol), 1,1-bis(4-hydroxyphenyl)cyclododecane, 1,1-bis(4-hydroxy-3-methylphenyl)cyclododecane, 1,1-bis(4-hydroxy-3-phenylphenyl)cyclododecane, 1,1-bis(4-hydroxy-3-t-butylphenyl Examples include, but are not limited to, cyclododecane, 1,1-bis(4-hydroxy-3-sec-butylphenyl)cyclododecane, 1,1-bis(4-hydroxy-3-allylphenyl)cyclododecane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)cyclododecane, 1,1-bis(4-hydroxy-3-fluorophenyl)cyclododecane, 1,1-bis(4-hydroxy-3-chlorophenyl)cyclododecane, 1,1-bis(4-hydroxy-3-bromophenyl)cyclododecane, 7-ethyl-1,1-bis(4-hydroxyphenyl)cyclododecane, 5,6-dimethyl-1,1-bis(4-hydroxyphenyl)cyclododecane, pentacyclopentadecanedimethanol, 1,4-cyclohexanedimethanol, 1,3-adamantanedimethanol, decalin-2,6-dimethanol, tricyclodecanedimethanol, fluorene glycol, fluororangeethanol, isosorbide, etc. The other diol compound mentioned above is preferably 2,2-bis(4-hydroxyphenyl)propane.

[0034] In one embodiment of the present invention, when the thermoplastic resin includes a polyester resin and / or a polyester carbonate resin, these resins may include a compound represented by the following general formula (V) as a monomer. [ka] (In general formula (V), R1 and R2 each independently represent a C6-C20 aryl group, a C2-C6 alkenyl group, a C1-C6 alkoxy group, or a C7-C17 aralkyl group, which may contain a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1-C6 alkyl group, or a heterocyclic atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom. a and b represent integers between 0 and 4.

[0035] In one embodiment of the present invention, the thermoplastic resin may include any of the following: a random copolymer structure, a block copolymer structure, or an alternating copolymer structure.

[0036] In one embodiment of the present invention, the polystyrene-equivalent mass average molecular weight (Mw) of the thermoplastic resin may preferably be 20,000 to 200,000. More preferably, the polystyrene-equivalent mass average molecular weight (Mw) of the thermoplastic resin is 25,000 to 120,000, even more preferably 28,000 to 55,000, and particularly preferably 30,000 to 45,000. If the polystyrene-equivalent mass average molecular weight (Mw) of the thermoplastic resin is within the above range, it is possible to prevent the molded article from becoming brittle, to avoid excessively high melt viscosity, to facilitate the removal of the resin after manufacturing, and to further improve fluidity, thereby facilitating injection molding in a molten state.

[0037] In another embodiment of the present invention, a thermoplastic resin composition can be used in the manufacture of optical lenses by blending the thermoplastic resin with other resins. Examples of other resins include, but are not limited to, polyamides, polyacetals, polycarbonates, modified polyphenylene ethers, polyethylene terephthalate, and polybutylene terephthalate.

[0038] (B) Color material The colorant is not particularly limited as long as it can be used in the thermoplastic resin composition of the present invention, and for example, dyes and pigments, organic colorants and inorganic colorants can be used. In one embodiment of the present invention, the colorant that can be used in the thermoplastic resin composition may include at least one of green pigment, red pigment, yellow pigment and purple pigment. In a preferred embodiment, the colorant that can be used in the thermoplastic resin composition includes green pigment, red pigment, yellow pigment and purple pigment.

[0039] In one embodiment of the present invention, the colorant that can be used in the thermoplastic resin composition may include at least one of the following: anthraquinone pigments, perinone pigments, methine pigments, isoindoline pigments, phthalocyanine pigments, quinacridone pigments, azo pigments, and lake pigments.

[0040] Green pigments that can be used in thermoplastic resin compositions include, for example, anthraquinone-based and perinone-based pigments, such as Oil Green 5602 from Arimoto Chemical Industry Co., Ltd., Macrolex Green G from Lanxess, and Oplas Green 533 from Orient Chemical Industry Co., Ltd., but are not limited to these.

[0041] Examples of red pigments that can be used in thermoplastic resin compositions include perinone-based and anthraquinone-based pigments, such as Oil Red 5303, Fluorescent Red DR-345, Plast Red 8355, 8360, 8365, 8370, D-54, DR-426N, and DR-427N from Arimoto Chemical Industry Co., Ltd., and MacrolexRedA and MacrolexRedEG from Lanxess Co., Ltd., but are not limited to these.

[0042] Examples of yellow pigments that can be used in thermoplastic resin compositions include methine-based, anthraquinone-based, and perinone-based pigments, such as Oil Yellow 5001, Plast Yellow 8000, 8005, 8040, 8050, and 8070 from Arimoto Chemical Industry Co., Ltd., and Macrolex Yellow 6G from Lanxess Co., Ltd., but are not limited to these.

[0043] Examples of purple pigments that can be used in thermoplastic resin compositions include anthraquinone-based and perinone-based pigments, such as Plast Violet 8840, 8850, and 8855 from Arimoto Chemical Industry Co., Ltd., and MacrolexViolet3R from Lanxess, but are not limited to these.

[0044] (C) Other ingredients In one embodiment of the present invention, the thermoplastic resin composition may include an antioxidant and a mold release agent as additives.

[0045] Antioxidants include triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert- Examples include butyl-4-hydroxybenzyl)benzene, N,N-hexamethylenebis(3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5-di-tert-butyl-4-hydroxybenzylphosphonate-diethyl ester, tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, and 3,9-bis{1,1-dimethyl-2-[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}-2,4,8,10-tetraoxaspiro(5,5)undecane.

[0046] The content of the antioxidant is preferably 0.50% by mass or less in the thermoplastic resin composition, more preferably 0.10 to 0.40% by mass, and particularly preferably 0.20 to 0.40% by mass.

[0047] As a mold release agent, it is preferable that 90% or more by mass consists of an ester of an alcohol and a fatty acid. Specifically, examples of esters of alcohol and fatty acids include esters of monohydric alcohols and fatty acids, and partial or total esters of polyhydric alcohols and fatty acids. As the above monohydric alcohol and fatty acid ester, an ester of a monohydric alcohol having 1 to 20 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms is preferred. Furthermore, as the partial or total ester of polyhydric alcohol and fatty acid, a partial or total ester of a polyhydric alcohol having 1 to 25 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms is preferred.

[0048] Specifically, examples of esters between monohydric alcohols and saturated fatty acids include stearyl stearate, palmityl palmitate, butyl stearate, methyl laurate, and isopropyl palmitate. Examples of partial or total esters between polyhydric alcohols and saturated fatty acids include monoglyceride stearate, diglyceride stearate, triglyceride stearate, monosorbite stearate, monoglyceride behenic acid, monoglyceride capric acid, monoglyceride laurate, pentaerythritol monostearate, pentaerythritol tetrastearate, pentaerythritol tetrapelargonate, propylene glycol monostearate, biphenyl biphenate, sorbitan monostearate, 2-ethylhexyl stearate, and total or partial esters of dipentaerythritol such as dipentaerythritol hexastearate.

[0049] The content of the mold release agent is preferably 0.50% by mass or less in the thermoplastic resin composition, more preferably 0.01 to 0.10% by mass, and particularly preferably 0.03 to 0.05% by mass.

[0050] Furthermore, the thermoplastic resin composition of the present invention may also contain other additives such as processing stabilizers, ultraviolet absorbers, flow modifiers, crystal nucleating agents, strengthening agents, dyes, antistatic agents, bluing agents, and antibacterial agents.

[0051] (D) Impurities The thermoplastic resin of the present invention may contain impurities such as phenol generated during production and unreacted monomers such as diols and diester carbonates. The phenol content in the thermoplastic resin is preferably 0.1 to 3000 ppm, more preferably 0.1 to 2000 ppm, and particularly preferably 1 to 1000 ppm, 1 to 800 ppm, 1 to 500 ppm, or 1 to 300 ppm. The diol content in the thermoplastic resin is preferably 0.1 to 5000 ppm, more preferably 1 to 3000 ppm, even more preferably 1 to 1000 ppm, and particularly preferably 1 to 500 ppm. The diester carbonate content in the thermoplastic resin is preferably 0.1 to 1000 ppm, more preferably 0.1 to 500 ppm, and particularly preferably 1 to 100 ppm. By adjusting the amounts of phenol and diester carbonate contained in the thermoplastic resin, a resin with properties suitable for the purpose can be obtained. The content of phenol and diester carbonate can be adjusted as needed by changing the polycondensation conditions and equipment. It can also be adjusted by changing the conditions of the extrusion process after polycondensation.

[0052] If the phenol or diester carbonate content exceeds the above range, problems such as reduced strength and odor generation in the resulting resin molded article may occur. On the other hand, if the phenol or diester carbonate content falls below the above range, there is a risk that the plasticity during resin melting will decrease.

[0053] 2. Method for producing thermoplastic resin compositions In one embodiment of the present invention, a thermoplastic resin can be produced according to the method described in WO2018 / 016516. Specifically, it can be produced by reacting a diol compound selected from the group consisting of compounds represented by the following general formulas (I), (II), and (III) with a carbonate precursor such as a diester carbonate, under heating, and further under atmospheric pressure or reduced pressure, in the presence or absence of a basic compound catalyst and / or a transesterification catalyst, by melt polycondensation. The method for producing the thermoplastic resin composition of the present invention is not limited to the above method. [ka] (In general formula (I), R1 to R4 each independently represent a C6 to C20 aryl group, a C2 to C6 alkenyl group, a C1 to C6 alkoxy group, or a C7 to C17 aralkyl group, which may contain a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1 to C6 alkyl group, or a heterocyclic atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom. p, q, r, and s each independently represent integers from 0 to 4. R is [ka] And, Here, i represents an integer from 0 to 10, ii represents an integer from 1 to 10, and iii represents an integer from 1 to 10. [ka] (In general formula (II), R6 and R7 are synonymous with R1-R4. n and m represent integers from 0 to 5. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10. [ka] (In general formula (III), R8 and R9 are synonymous with R1-R4. a and b represent integers from 0 to 4. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10.

[0054] In one embodiment of the present invention, a thermoplastic resin composition can be produced by melt-kneading the thermoplastic resin produced as described above with a colorant. The thermoplastic resin of the present invention can be obtained as pellets by mixing in a tumbler, melt-kneading using a twin-screw extruder or the like, and then cutting strands, but is not limited to this method.

[0055] 3. Physical properties of thermoplastic resin compositions The thermoplastic resin composition of the present invention, which is a high refractive index material with added colorants, cuts visible light and transmits infrared light. Therefore, by using the thermoplastic resin composition of the present invention in an optical lens for an infrared camera / sensor, noise originating from visible light can be effectively reduced.

[0056] (A) Refractive index (nD) In one embodiment of the present invention, the thermoplastic resin composition may have a refractive index of 1.60 or higher at a wavelength of 894 nm and 23°C. The refractive index of the thermoplastic resin composition of the present invention at a wavelength of 894 nm is preferably 1.61 to 1.71, more preferably 1.62 to 1.70, and particularly preferably 1.64 to 1.68. The thermoplastic resin composition of the present invention has a high refractive index and is suitable as an optical lens material. The refractive index can be measured using a V-block refractometer (PR-2, manufactured by Carl Zeiss Jena) in accordance with JIS B7071-2.

[0057] (B) Transmittance In one embodiment of the present invention, when the thermoplastic resin composition has a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is more than 0% and 1.00% or less, and the average transmittance at wavelengths of 840 nm to 940 nm may be 80% or more. When the thermoplastic resin composition of the present invention has a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is preferably more than 0% and 0.8%, more preferably more than 0% and 0.5%, and even more preferably 0.1% or less. Furthermore, when the thermoplastic resin composition of the present invention has a thickness of 1 mm, the average transmittance at wavelengths of 840 nm to 940 nm is preferably 85% or more, more preferably 90% or more, and particularly preferably 99% or more. If the maximum transmittance at wavelengths of 380 nm to 630 nm and the average transmittance at wavelengths of 840 nm to 940 nm are within the above ranges, noise originating from visible light can be efficiently reduced, and image accuracy can be improved at measurement wavelengths by infrared cameras and infrared sensors. Furthermore, in a preferred embodiment of the present invention, the transmittance at a wavelength of 720 nm may be 50% or less, and the transmittance at a wavelength of 780 nm may be 50% or more. The transmittance at a wavelength of 720 nm is more preferably 40% or less, and even more preferably 35% or less. The transmittance at a wavelength of 780 nm is more preferably 60% or more, and even more preferably 70% or more. The transmittance can be measured in accordance with JIS K7105 for a 1 mm thick portion of a stepped flat test piece using a spectrophotometer (Hitachi High-Technologies Corporation "U-4100").

[0058] (C) Glass transition temperature (Tg) In one embodiment of the present invention, the glass transition temperature (Tg) of the thermoplastic resin composition is 90 to 180°C, more preferably 95 to 175°C, even more preferably 100 to 170°C, even more preferably 130 to 170°C, and particularly preferably 135 to 150°C. A glass transition temperature (Tg) within the above range is advantageous for injection molding. A Tg lower than 90°C is undesirable because it narrows the usable temperature range. A Tg exceeding 180°C is also undesirable because it increases the melting temperature of the resin, making decomposition and discoloration more likely. If the glass transition temperature of the resin is too high, the difference between the mold temperature and the resin glass transition temperature becomes large in general-purpose mold temperature controllers. Therefore, in applications where strict surface accuracy is required for the product, the use of a resin with an excessively high glass transition temperature is difficult and undesirable. Furthermore, from the viewpoint of moldability and heat resistance, the lower limit of Tg is preferably 130°C, more preferably 135°C, and the upper limit of Tg is preferably 160°C, more preferably 150°C.

[0059] (D) Other characteristics The thermoplastic resin composition of the present invention has high resistance to humidity and heat. This resistance can be evaluated by performing a "PCT test" (pressure cooker test) on an optical molded article obtained using the thermoplastic resin composition and measuring the total light transmittance of the optical molded article after the test. The PCT test can be performed by holding an injection-molded article with a diameter of 50 mm and a thickness of 3 mm under conditions of 120°C, 0.2 MPa, 100% RH, and 20 hours. The thermoplastic resin composition of the present invention has a total light transmittance of 60% or more after the PCT test, preferably 70% or more, more preferably 75% or more, even more preferably 80% or more, and particularly preferably 85% or more. A total light transmittance of 60% or more indicates that the composition has higher resistance to humidity and heat than conventional polycarbonate resins.

[0060] The b-value of the thermoplastic resin composition of the present invention is preferably 5 or less. A smaller b-value indicates less yellowing and better hue.

[0061] The amount of residual phenol in the thermoplastic resin composition of the present invention is preferably 500 ppm or less, more preferably 300 ppm or less, and even more preferably 50 ppm or less.

[0062] The amount of residual diphenyl carbonate (DPC) contained in the thermoplastic resin composition of the present invention is preferably 200 ppm or less, more preferably 100 ppm or less, and even more preferably 50 ppm or less.

[0063] 4. Optical lenses The optical lens of the present invention can be obtained by injection molding the thermoplastic resin composition of the present invention described above into a lens shape using an injection molding machine or an injection compression molding machine. In one embodiment of the present invention, the optical lens can be manufactured according to the method described in WO2018 / 016516. The molding conditions for injection molding are not particularly limited, but the molding temperature is preferably 180 to 300°C, more preferably 180 to 290°C. The injection pressure is preferably 50 to 1700 kg / cm². 2 That is the case.

[0064] In order to minimize the inclusion of foreign matter in the optical lens, the molding environment must naturally be a low-dust environment, preferably class 1000 or lower, and more preferably class 100 or lower.

[0065] The optical lens of the present invention is preferably implemented in the form of an aspherical lens as needed. Since an aspherical lens can substantially eliminate spherical aberration with a single lens, there is no need to eliminate spherical aberration by combining multiple spherical lenses, which enables weight reduction and a reduction in production costs. Therefore, aspherical lenses are particularly useful as camera lenses among optical lenses. The astigmatism of the aspherical lens is preferably 0 to 15 mλ, and more preferably 0 to 10 mλ.

[0066] The thickness of the optical lens of the present invention can be set over a wide range depending on the application and is not particularly limited, but is preferably 0.01 to 30 mm, more preferably 0.1 to 15 mm. The surface of the optical lens of the present invention may be provided with a coating layer, such as an anti-reflective layer or a hard coat layer, as needed. The anti-reflective layer may be a single layer or a multilayer layer, and may be organic or inorganic, but is preferably inorganic. Specifically, examples include oxides or fluorides such as silicon dioxide, aluminum oxide, zirconium oxide, titanium oxide, cerium oxide, magnesium oxide, and magnesium fluoride. Of these, silicon dioxide and zirconium oxide are more preferred, and a combination of silicon dioxide and zirconium oxide is even more preferred. Furthermore, there are no particular limitations on the combination of single-layer / multilayer anti-reflective layers, their components, and thicknesses, but a two-layer or three-layer configuration is preferred, and a three-layer configuration is particularly preferred. Furthermore, the anti-reflective layer as a whole should be formed to a thickness of 0.00017 to 3.3% of the thickness of the optical lens, specifically 0.05 to 3 μm, and particularly preferably 1 to 2 μm.

[0067] In one embodiment of the present invention, the optical lens may be a lens for an infrared camera. In a preferred embodiment of the present invention, the optical lens is a lens for a biometric camera. [Examples]

[0068] The present invention will be described below using examples, but it is not intended that the present invention is limited to these examples.

[0069] (1) Transmittance After drying the thermoplastic resin composition pellets at 120°C for 5 hours in a hot air circulation dryer, two stepped flat test specimens measuring 40 mm in width and 80 mm in length with thicknesses of 1 mm and 2 mm were molded using an injection molding machine (FANUC ROBOSHOT S-2000i30A) under the conditions of resin temperature 260°C, mold temperature 130°C, and molding cycle of 30 seconds. In accordance with JIS K7105, the transmittance of the 1 mm thick portion of the stepped flat test specimen was measured using a spectrophotometer (Hitachi High-Technologies Corporation "U-4100"). The maximum transmittance value in the wavelength range of 380 nm to 630 nm is the maximum value among 250 data points obtained by measuring transmittance at 1 nm intervals in the wavelength range of 380 nm to 630 nm. The average transmittance at wavelengths of 840nm to 940nm is the average of 100 data points obtained by measuring transmittance at 1nm intervals within the wavelength range of 840nm to 940nm.

[0070] (2) Refractive index (nD) Pellets of thermoplastic resin or thermoplastic resin composition were dried at 120°C for 5 hours in a hot air circulation dryer. Then, flat test specimens measuring 40 mm wide x 40 mm long and 3 mm thick were molded using an injection molding machine (FANUC ROBOSHOT S-2000i30A) under the conditions of resin temperature 260°C, mold temperature 130°C, and molding cycle 30 seconds. The refractive index was measured using a V-block refractometer (Carl Zeiss Jena "PR-2") in accordance with JIS B7071-2.

[0071] (3) Abbe number (ν) The Abbe number (ν) of the thermoplastic resin is preferably 24 or less, more preferably 22 or less, and even more preferably 20 or less. The Abbe number can be calculated from the refractive indices at wavelengths of 486 nm, 589 nm, and 656 nm at 23°C using the following formula. The refractive indices at wavelengths of 486 nm, 589 nm, and 656 nm can be measured for a 0.1 mm thick film using an Abbe refractometer according to the method of JIS-K-7142. ν = (nD-1) / (nF-nC) nD: Refractive index at a wavelength of 589 nm nC: Refractive index at a wavelength of 656 nm nF: Refractive index at a wavelength of 486 nm

[0072] (4) Polystyrene-based mass-average molecular weight (Mw) A calibration curve was created using gel permeation chromatography (GPC) with tetrahydrofuran as the developing solvent and standard polystyrene of known molecular weight (molecular weight distribution = 1). Based on this calibration curve, Mw was calculated from the GPC retention time.

[0073] (5) Glass transition temperature (Tg) Measurements were taken using a differential thermal scanning calorimetry (DSC) analyzer in accordance with JIS K7121-1987. A Hitachi High-Tech Science X-DSC7000 DSC analyzer was used. The heating rate was 10°C per minute.

[0074] (6) Total light transmittance For measuring the b-values ​​described below, a 3mm thick plate made of thermoplastic resin was prepared and measured using a SE2000 spectrophotometer manufactured by Nippon Denshoku Industries, Ltd., according to the method of JIS-K-7361-1.

[0075] (7) b value The manufactured resin was vacuum-dried at 120°C for 4 hours, and then injection-molded using an injection molding machine (FANUC ROBOSHOT α-S30iA) at a cylinder temperature of 270°C and a mold temperature Tg-10°C to obtain a disc-shaped test plate with a diameter of 50 mm and a thickness of 3 mm. The b-value was measured using this plate in accordance with JIS K7105. A smaller b-value indicates less yellowness and better hue. A SE2000 spectrophotometer manufactured by Nippon Denshoku Industries, Ltd. was used to measure the molded plate.

[0076] (8) Amount of residual phenol and residual diphenyl carbonate (DPC) 1.0 g of polycarbonate resin was accurately weighed and dissolved in 10 ml of dichloromethane. The resin was then gradually added to 100 ml of methanol while stirring to reprecipitate it. After thorough stirring, the precipitate was filtered off, and the filtrate was concentrated using an evaporator. 1.0 g of standard substance solution was accurately weighed and added to the resulting solid. A further 1 g of chloroform was added to dilute the solution, and the resulting solution was quantified by GC-MS. Standard substance solution: 200 ppm chloroform solution of 2,4,6-trimethylphenol Measuring device (GC-MS): Agilent HP6890 / 5973MSD Column: Capillary column DB-5MS, 30m x 0.25mm ID, film thickness 0.5μm Heating conditions: 50°C (hold for 5 minutes) to 300°C (hold for 15 minutes), 10°C / min Injection port temperature: 300℃, injection volume: 1.0 μl (split ratio 25) Ionization method: EI method Carrier gas: He, 1.0 ml / min Aux temperature: 300℃ Mass scan range: 33-700

[0077] (9) Remaining BHEBN amount and remaining BPPEF amount 0.5 g of weighed polycarbonate resin was dissolved in 50 ml of tetrahydrofuran (THF) to prepare the sample solution. A calibration curve was created using pure samples of each compound as standards, and 2 μL of the sample solution was quantified by LC-MS under the following measurement conditions. The detection limit under these conditions is 0.01 ppm. Other residual monomers besides residual BHEBN and residual BPPEF can be measured in the same manner. LC-MS measurement conditions: Measuring device (LC part): Agilent Infinity 1260 LC System Column: ZORBAX Eclipse XDB-18, and guard cartridge Mobile phase: A: 0.01 mol / L ammonium acetate aqueous solution B: 0.01 mol / L ammonium acetate in methanol solution C:THF Mobile phase gradient program: [Table 1] Flow rate: 0.3ml / min Column temperature: 45℃ Detector: UV (225nm) Measurement equipment (MS part): Agilent 6120 single quad LCMS System Ionization source: ESI Polarity: Positive Fragmenter: 100V Dry gas: 10 L / min, 350℃ Nebulizer: 50 psi Capillary voltage: 3000V Measured ions: BHEBN: Ion species = [M+NH4]-, m / z = 392.1 BPPEF: Ion species = [M+NH4]-, m / z = 608.3

[0078] <Manufacturing of thermoplastic resin compositions> [Production example 1] Thermoplastic resin A (high refractive index material) The raw materials are 8.0 kg (14.85 mol) of 9,9-bis[6-(2-hydroxyethoxy)naphthalene-2-yl]fluorene (also known as "BNEF"), 7.5 kg (20.03 mol) of 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (also known as "BHEBN"), 7.5 kg (12.70 mol) of 9,9-bis[4-(2-hydroxyethoxy)-3-phenylphenyl]fluorene (also known as "BPPEF"), 10.5 kg (49.02 mol) of diphenyl carbonate (also known as "DPC"), and 2.5 × 10 -2 16 ml of mol / liter sodium bicarbonate solution (4.0 × 10⁻⁶) -4 For every mole, i.e., 1 mole of dihydroxy compounds, 8.4 × 10 -6The molal (molar) was placed in a 50L reactor equipped with a stirrer and distillation apparatus, and heated to 180°C under a nitrogen atmosphere of 760 mmHg. Complete dissolution of the raw materials was confirmed 30 minutes after the start of heating, and stirring was then carried out under the same conditions for 120 minutes. Subsequently, the pressure was adjusted to 200 mmHg, and the temperature was increased to 200°C at a rate of 60°C / hr. At this time, the start of distillation of the by-product phenol was confirmed. The reaction was then carried out while maintaining the temperature at 200°C for 20 minutes. Furthermore, the temperature was increased to 230°C at a rate of 75°C / hr, and 10 minutes after the end of the heating, the pressure was reduced to 1 mmHg or less over 2 hours while maintaining the temperature at that temperature. Subsequently, the temperature was increased to 245°C at a rate of 60°C / hr, and stirring was carried out for a further 40 minutes. After the reaction was complete, nitrogen was introduced into the reactor to return to atmospheric pressure, and the resulting thermoplastic resin was pelletized and removed. The obtained resin had a polystyrene-based mass-average molecular weight (Mw) of 32,000 and a glass transition temperature (Tg) of 142°C. [ka]

[0079] [Manufacturing example 2] Thermoplastic resin B (high refractive index material) The raw materials are 20.86 kg (47.56 mol) of 9,9-bis[4-(2-hydroxyethoxy)-phenyl]fluorene (also known as "BPEF"), 10.5 kg (49.02 mol) of DPC, and 2.5 × 10 -2 16 ml of mol / liter sodium bicarbonate solution (4.0 × 10⁻⁶) -4 For every mole, i.e., 1 mole of dihydroxy compounds, 8.4 × 10 -6 A thermoplastic resin was obtained in the same manner as in Example 1, except that a molar mass was used. The obtained resin had a polystyrene-equivalent mass-average molecular weight (Mw) of 31,000 and a glass transition temperature (Tg) of 145°C. [ka]

[0080] [Manufacturing example 3] Thermoplastic resin C (high refractive index material) As raw materials, 18.15 kg (41.39 mol) of BPEF, 1.41 kg (6.18 mol) of 2,2'-bis(4-hydroxyphenyl)propane (also referred to as "BPA"), 10.5 kg (49.02 mol) of DPC, and 16 milliliters (4.0×10 -2 mol) of a 2.5×10 molar / liter aqueous sodium hydrogen carbonate solution were used. Except for this, a thermoplastic resin was obtained in the same manner as in Example 1. The polystyrene-reduced mass average molecular weight (Mw) of the obtained resin was 31,000, and the glass transition temperature (Tg) was 145°C. -4 mol, that is, 8.4×10 -6 mol) based on a total of 1 mol of the dihydroxy compound.

Chemical formula

[0081] [Production Example 4] Thermoplastic resin E (high refractive material) As raw materials, 4.53 kg (12.1 mol) of BHEBN, 8.72 kg (14.8 mol) of BPPEF, 5.99 kg (27.9 mol) of DPC, and 16 milliliters (4.0×10 -2 mol) of a 2.5×10 molar / liter aqueous sodium hydrogen carbonate solution were used. Except for this, a thermoplastic resin was obtained in the same manner as in Example 1. The polystyrene-reduced mass average molecular weight (Mw) of the obtained resin was 32,000, and the glass transition temperature (Tg) was 140°C. -4 mol, that is, 8.4×10 -6 mol) based on a total of 1 mol of the dihydroxy compound.

Chemical formula

[0082] Thermoplastic resin D (general thermoplastic resin) As the thermoplastic resin D, Iupilon S-3000 (a homopolymer resin of BPA) manufactured by Mitsubishi Engineering-Plastics Corporation was used.

[0083] <Manufacture of thermoplastic resin composition> [Examples 1 to 8] Thermoplastic resin, green pigment, red pigment, yellow pigment, and purple pigment were blended in the proportions (parts by mass) shown in Table 2, mixed in a tumbler for 20 minutes, and then melt-kneaded at a cylinder temperature of 260°C using a twin-screw extruder (TEX30α, manufactured by Japan Steel Works), and pellets of the thermoplastic resin composition were obtained by strand cutting.

[0084] [Comparative Example 1] Comparative Example 1 was a thermoplastic resin composition that used thermoplastic resin A, a high refractive index material, and did not contain a colorant (Table 2).

[0085] [Comparative Example 2] Comparative Example 2 was a thermoplastic resin composition in which thermoplastic resin A, a high refractive index material, was used as the thermoplastic resin, and carbon black was included as the colorant (Table 2).

[0086] [Comparative Example 3] Comparative Example 3 was a thermoplastic resin composition using thermoplastic resin D, a common thermoplastic resin, and containing green pigment, red pigment, yellow pigment, and purple pigment (Table 2).

[0087] For the thermoplastic resin compositions obtained in Examples 1-8 and Comparative Examples 1-3, the refractive index at a wavelength of 894 nm, the maximum transmittance (in %) at wavelengths of 380 nm to 630 nm, the transmittance (in %) at a wavelength of 720 nm, the transmittance (in %) at a wavelength of 780 nm, and the average transmittance (in %) at wavelengths of 840 nm to 940 nm were measured for a thickness of 1 mm and are shown in Table 2.

[0088] [Table 2]

[0089] As shown in Table 2, the thermoplastic resin composition of the present invention, which includes a high refractive index material and a colorant, can detect infrared rays and effectively cut visible light. Therefore, by using the thermoplastic resin composition of the present invention in optical lenses for infrared cameras / sensors, noise originating from visible light can be reduced and image accuracy can be improved.

Claims

1. An optical component comprising a thermoplastic resin composition, The thermoplastic resin composition Thermoplastic resin and Colorants and The thermoplastic resin composition has a refractive index of 1.60 or higher at a wavelength of 894 nm. In a test specimen of the thermoplastic resin composition with a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is greater than 0% and 1.00% or less, and the average transmittance at wavelengths of 840 nm to 940 nm is 80% or more. The thermoplastic resin includes, as a monomer, a compound selected from the group consisting of compounds represented by the following general formulas (I), (II), (III), and (V): The optical component is for use as an optical lens. Optical components. 【Chemistry 1】 (In general formula (I), R １ ~R ４ Each of these independently represents a C6-C20 aryl group, a C2-C6 alkenyl group, a C1-C6 alkoxy group, or a C7-C17 aralkyl group, which may contain a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1-C6 alkyl group, or a heterocyclic atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom. p, q, r, and s each independently represent integers from 0 to 4. R is, 【Chemistry 2】 And, Here, i represents an integer from 0 to 10, ii represents an integer from 1 to 10, and iii represents an integer from 1 to 10. 【Transformation 3】 (In general formula (II), R ６ and R ７ is R １ ~R ４ It is synonymous with, n and m represent integers from 0 to 5. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10. 【Chemistry 4】 (In general formula (III), R ８ and R ９ is R １ ~R ４ is synonymous with a and b represent integers from 0 to 4. Y represents an alkylene group with 1 to 5 carbon atoms. n1 and n2 each independently represent integers between 0 and 10. 【Transformation 5】 (In general formula (V), R １ and R ２ Each of these independently represents a C6-C20 aryl group, a C2-C6 alkenyl group, a C1-C6 alkoxy group, or a C7-C17 aralkyl group, which may contain a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1-C6 alkyl group, or a heterocyclic atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom. a and b represent integers between 0 and 4.

2. The optical member according to claim 1, wherein the thermoplastic resin includes a resin selected from the group consisting of polycarbonate resin, polyester resin, and polyester carbonate resin.

3. The optical member according to claim 1 or 2, wherein the colorant comprises at least one of a green pigment, a red pigment, a yellow pigment, and a purple pigment.

4. The optical member according to claim 1 or 2, wherein the colorant comprises at least one of anthraquinone pigments, perinone pigments, methine pigments, isoindoline pigments, phthalocyanine pigments, quinacridone pigments, azo pigments, and lake pigments.

5. The optical member according to any one of claims 1 to 4, wherein in a test piece of the thermoplastic resin composition with a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is greater than 0% and less than or equal to 0.8%.

6. The optical member according to any one of claims 1 to 5, wherein in a test piece of the thermoplastic resin composition with a thickness of 1 mm, the maximum transmittance at wavelengths of 380 nm to 630 nm is greater than 0% and less than or equal to 0.5%.

7. The optical component according to any one of claims 1 to 6, wherein the optical lens is a lens for an infrared camera.

8. The optical component according to claim 7, wherein the optical lens is a lens for a biometric authentication camera.

9. An optical lens made from an optical component described in any one of claims 1 to 6.

10. A lens for an infrared camera, made from an optical component as described in any one of claims 1 to 6.

11. A lens for a biometric authentication camera, made from an optical component according to any one of claims 1 to 6.

Images