Composition, molded body, and lens

Abstract

The present invention provides a composition that exhibits good ultraviolet light blocking properties and good transparency. [Solution] A composition comprising a polycarbonate resin (A), 0.40 to 1.50% by mass of an ultraviolet absorber (B), and 0.00010 to 0.00080% by mass of a dye (C), wherein the ultraviolet absorber (B) has an absorbance of 1.50 or less obtained by subtracting the absorbance of the bisphenol A type polycarbonate resin (i) at 410 nm from the absorbance of the composition (ii) at 410 nm of 99% by mass of bisphenol A type polycarbonate resin (i) and 1% by mass of the ultraviolet absorber (B), and the dye (C) is one or more selected from the group consisting of blue dyes and purple dyes, and when the total light transmittance of the composition with a thickness of 2 mm is measured, the maximum wavelength at which the transmittance is 1% or less in the wavelength range of 380 to 420 nm is 396 nm or higher.

Description

[Technical Field]

[0001] The present invention relates to a composition, and to a molded article and a lens containing the composition. [Background technology]

[0002] The eyes are constantly exposed to damage from sunlight, and it is important to protect them from ultraviolet light up to around 400nm wavelength. Recent research has also revealed that wavelengths closer to the visible light range can damage eye tissue and contribute to conditions such as cataracts. Furthermore, with the widespread use of LED-based devices and lighting, it has been reported that blue light, which is abundant in LED light sources, can also cause eye diseases.

[0003] Generally, polycarbonate resins have excellent mechanical properties, weather resistance, and transparency, and polycarbonate compositions containing UV absorbers are used as transparent UV-absorbing materials for eyeglasses, sunglasses, goggles, and various lighting covers. UV absorbers such as benzophenone-based, benzotriazole-based, triazine-based, and salicylate-based UV absorbers are used (see, for example, Patent Documents 1-2). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 09-291205 [Patent Document 2] Special Publication No. 06-51840 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, the extensive use of UV absorbers to block ultraviolet light can degrade the transparency and hue of polycarbonate resin, posing a challenge, particularly in applications where transparency is required, such as lenses.

[0006] The present invention has been made in view of the above situation, and an object thereof is to provide a composition having good ultraviolet light cutting property and good transparency, and a molded body and a lens containing the composition.

Means for Solving the Problems

[0007] As a result of intensive studies by the present inventors, it has been found that the above problems can be solved by using a composition in which an appropriate type and amount of an ultraviolet absorber and a dye are added to a polycarbonate resin, and the present invention has been completed. That is, the present invention includes the following aspects, and also includes aspects arbitrarily combined with the following aspects.

[0008] <1> A composition comprising a polycarbonate resin (A), 0.40 to 1.50% by mass of an ultraviolet absorber (B), and 0.00010 to 0.00080% by mass of a dye (C), The ultraviolet absorber (B) has a differential absorbance at 410 nm calculated from the following formula (1) of 1.50 or less, The dye (C) is at least one selected from the group consisting of blue dyes and purple dyes, When the total light transmittance of the composition having a thickness of 2 mm is measured, in the wavelength range of 380 to 420 nm, the maximum wavelength at which the transmittance becomes 1% or less is 396 nm or more. [Differential absorbance at 410 nm]=[Absorbance (β)]−[Absorbance (α)] … formula (1) The absorbance (α) is the absorbance at 410 nm in the thickness direction of a molded body obtained by kneading a bisphenol A type polycarbonate resin (i) at an extrusion temperature of 290° C., producing pellets of the resin (i), and processing them into a plate shape with a thickness of 3 mm by injection molding. The absorbance (β) is the absorbance at 410 nm in the thickness direction of a molded body obtained by kneading the resin (i) and the ultraviolet absorber (B) at an extrusion temperature of 290° C., producing pellets of a composition (ii) composed of 99% by mass of the resin (i) and 1% by mass of the ultraviolet absorber (B), and processing them into a plate shape with a thickness of 3 mm by injection molding. <2> The ultraviolet absorber (B) has a benzophenone structure, and the hydrogen atom at the para position of at least one benzene ring in the benzophenone structure is substituent R 1 It is replaced by the R 1 The above is an alkoxy group or hydroxyl group having 1 to 10 carbon atoms. <1> The composition described above. <3> In the ultraviolet absorber (B), the substituent R 1 The alkoxy group has 1 to 8 carbon atoms, and furthermore, at least one of the hydrogen atoms in the ortho position of at least one of the benzene rings is modified with a hydroxyl group, <2> The composition described above. <4> The substituent R 1 The above is a methoxy group <2> or <3> The composition described above. <5> When the total light transmittance of the composition with a thickness of 2 mm is measured, the minimum transmittance in the wavelength range of 460 to 700 nm is 81.0% or more. <1> from <4> A composition as described in any of the following. <6> The dye (C) comprises one or more dyes selected from the group consisting of Solvent Blue 97, Solvent Violet 36, Solvent Blue 104, Disperse Blue 60, Disperse Blue 198, Solvent Violet 13, Disperse Violet 31, Solvent Violet 33, and Solvent Violet 34, wherein the color index of the dye (C) is <1> from <5> A composition as described in any of the following. <7> The aforementioned <1> from <6> A molded article comprising the composition described in any of the above. <8> The aforementioned <7> A lens containing the molded body described above. [Effects of the Invention]

[0009] The present invention provides a composition that has good ultraviolet light blocking properties and good transparency, as well as a molded article and a lens containing the composition. [Brief explanation of the drawing]

[0010] [Figure 1]This is the difference absorption curve of the UV absorbers (B) and (B-1) used in the example. [Figure 2] These are the transmission spectra of the total light transmittance in the 300-700 nm range for Examples 1, 2, and 5 and Comparative Examples 1-5. [Figure 3] This is an enlarged view of the transmission spectrum in the 380-410 nm region shown in Figure 2. [Figure 4] This is an enlarged view of the transmission spectrum in the 400-700 nm region shown in Figure 2. [Figure 5] These are the transmission spectra of total light transmittance in the 300-700 nm range for Examples 8 and 9 and Comparative Examples 6-8. [Figure 6] This is an enlarged view of the transmission spectrum in the 380-410 nm region shown in Figure 5. [Figure 7] This is an enlarged view of the transmission spectrum in the 400-700 nm region shown in Figure 5. [Modes for carrying out the invention]

[0011] 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.

[0012] <Composition> The present invention relates to a composition comprising a polycarbonate resin (A), 0.40 to 1.50% by mass of an ultraviolet absorber (B), and 0.00010 to 0.00080% by mass of a dye (C), wherein the ultraviolet absorber (B) has a differential absorbance at 410 nm calculated from the following formula (1) of 1.50 or less, and the dye (C) is one or more selected from the group consisting of blue dyes and purple dyes, and when the total light transmittance of the composition with a thickness of 2 mm is measured, the maximum wavelength at which the transmittance is 1% or less in the wavelength range of 380 to 420 nm is 396 nm or higher, wherein the composition (hereinafter sometimes referred to as "the composition of the present invention") is the present invention. [Differential absorbance at 410 nm] = [Absorbance (β)] - [Absorbance (α)] ... Equation (1) The absorbance (α) is the absorbance at 410 nm in the thickness direction of a molded article obtained by kneading a bisphenol A type polycarbonate resin (i) at an extrusion temperature of 290°C to produce pellets of the resin (i), and then processing the resulting molded article into a 3 mm thick plate by injection molding. The absorbance (β) is the absorbance at 410 nm in the thickness direction of a molded article obtained by kneading the resin (i) and the ultraviolet absorber (B) at an extrusion temperature of 290°C to produce pellets of composition (ii) consisting of 99% by mass of the resin (i) and 1% by mass of the ultraviolet absorber (B), and then processing the resulting molded article into a 3 mm thick plate by injection molding.

[0013] This configuration allows for excellent UV light blocking while allowing sufficient visible light to pass through. Furthermore, it suppresses yellowing (YI) and achieves superior transparency in the visible light region.

[0014] In one embodiment, the present invention is a resin composition. In this embodiment, the term "composition" in this specification shall be read as "resin composition".

[0015] The components and other elements constituting the composition of the present invention will be described in detail below.

[0016] [Polycarbonate (PC) resin (A)] The polycarbonate resin (A) contained in the composition of the present invention is a polymer having a basic structure with a carbonate bond represented by the formula: -[-OXOC(=O)-]-. In the formula, X is generally a hydrocarbon, but X with heteroatoms or heterobonds introduced may be used to impart various properties.

[0017] Furthermore, polycarbonate resin (A) 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.

[0018] There are no specific restrictions on the type of polycarbonate resin (A), but examples include polycarbonate polymers obtained by reacting a dihydroxy compound with a carbonate precursor. In this case, polyhydroxy compounds may also 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.

[0019] 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;

[0020] Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl;

[0021] 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;

[0022] 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. kind;

[0023] 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;

[0024] 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;

[0025] 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;

[0026] Dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide;

[0027] Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide;

[0028] Dihydroxydiarylsulfones such as 4,4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; These are some examples.

[0029] 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.

[0030] 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;

[0031] 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;

[0032] Glycols such as ethylene glycol, 2,2'-oxydiethanol (i.e., diethylene glycol), triethylene glycol, propylene glycol, and spiroglycol;

[0033] 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;

[0034] 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.

[0035] 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.

[0036] Examples of carbonyl halides include, specifically, phosgene; bischloroformates of dihydroxy compounds; monochloroformates of dihydroxy compounds; and other haloformates.

[0037] 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.

[0038] The method for producing polycarbonate resin (A) 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.

[0039] The polycarbonate resin (A) 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 (A). (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.

[0040] The molecular weight of the polycarbonate resin (A) 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 product 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.

[0041] Furthermore, polycarbonate resin (A) 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.

[0042] For example, in order to improve the appearance and fluidity of the molded product, the polycarbonate resin (A) 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 (A) (including the polycarbonate oligomer).

[0043] 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.

[0044]

number

[0045] 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.

[0046] Furthermore, when the polycarbonate resin (A) contains repeating units that constitute a structure other than the polycarbonate polymer, the polycarbonate resin (A) is preferably a copolymer mainly composed of the polycarbonate polymer, and the proportion of the polycarbonate polymer in the polycarbonate resin (A) 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.

[0047] Furthermore, the polycarbonate resin (A) 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 (A), 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.

[0048] The content of polycarbonate 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 ultraviolet absorber (B) and dye (C) may be the polycarbonate resin (A), and the proportion may be, for example, 99.5999% by mass or less. Generally, when the content of polycarbonate 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.

[0049] [UV Visualizer (B)] The composition of the present invention contains 0.40 to 1.50% by mass of an ultraviolet absorber (B). The ultraviolet absorber (B) contained in the composition of the present invention has the following differential absorbance at 410 nm (hereinafter referred to as "ΔA 410 It may be stated as follows: A material with a value of 1.50 or less is selected. In this way, by including a specific amount of ultraviolet absorber (B) having specific absorption characteristics, it is possible to block ultraviolet light up to around 400 nm while transmitting light of the blue visible light wavelength range, thus resulting in a material with excellent ultraviolet light blocking properties and transparency.

[0050] In this invention, the differential absorbance at 410 nm (△A) is used as an index for evaluating the absorbance of the ultraviolet absorber (B) at 410 nm. 410is adopted. In this specification, ΔA 410 is derived from the difference in absorbance at 410 nm between bisphenol A type polycarbonate resin (i) and composition (ii) consisting of 99% by mass of bisphenol A type polycarbonate resin (i) and 1% by mass of the ultraviolet absorber (B). Specifically, the differential absorbance (ΔA 410 ) at 410 nm is defined as the value calculated from the following formula (1). [Differential absorbance at 410 nm] = [Absorbance (β)] - [Absorbance (α)] … Formula (1)

[0051] Here, the absorbance (α) in formula (1) is obtained as follows. First, the bisphenol A type polycarbonate resin (i) is kneaded at an extrusion temperature of 290 °C to produce pellets of the resin (i). Next, the pellets of the resin (i) are processed into a plate shape with a thickness of 3 mm by injection molding to obtain a molded body of the resin (i). Then, for the molded body of the resin (i), an absorption curve in the thickness direction is measured, and the absorbance at 410 nm is taken as the absorbance (α).

[0052] Also, the absorbance (β) in formula (1) is obtained as follows. First, the resin (i) and the ultraviolet absorber (B) are kneaded at an extrusion temperature of 290 °C to produce pellets of composition (ii) consisting of 99% by mass of the resin (i) and 1% by mass of the ultraviolet absorber (B). Next, the pellets of composition (ii) are processed into a plate shape with a thickness of 3 mm by injection molding to obtain a molded body of composition (ii). Then, for the molded body of composition (ii), an absorption curve in the thickness direction is measured, and the absorbance at​​​​​​​​​​​When the value is below the upper limit mentioned above, the yellowish tint caused by the absorption of blue light can be suppressed, and when it is above the lower limit mentioned above, a composition with good light absorption ability near 400 nm, which is preferable to block, tends to be obtained.

[0054] The difference absorption curve obtained by subtracting the absorption curve of resin (i) from the absorption curve of composition (ii) preferably has a maximum absorption wavelength in the 300-400 nm wavelength range, decreases in absorbance as the wavelength increases from 400-440 nm, and has an absorbance of 1.50 or less in the wavelength range of 410 nm or more. An example is shown in Figure 1.

[0055] Furthermore, it is preferable that the ultraviolet absorber (B) has an absorbance of 4.50 or less at 396 nm, an absorbance of 1.50 or less at 410 nm, and an absorbance of 0.5 or less at 420 nm in the differential absorption curve. It is also preferable that the absorbance at 396 nm is 2.00 or more and the absorbance at 410 nm is 0.50 or more. Such absorbances allow light in the visible light region to pass through effectively.

[0056] Furthermore, in the differential absorption curve, in order to increase the blocking rate of ultraviolet light, the absorbance in the 300-396 nm range is preferably 1.50 or higher, more preferably 2.00 or higher, and even more preferably 2.50 or higher.

[0057] (Structure of UV absorbers) The ultraviolet absorber (B) can be any substance having the above-mentioned absorption properties, but it is preferable to select a benzophenone compound.

[0058] Benzophenone compounds have a benzophenone structure, and at least one hydrogen atom at the para position of the benzene ring in the benzophenone structure is a substituent R 1 It is substituted with substituent R 1Compounds having 1 to 10 carbon atoms, such as an alkoxy group or a hydroxyl group, are preferred. The alkoxy group having 1 to 10 carbon atoms may be unsubstituted or substituted, and may be linear, branched, or cyclic. Specific examples include methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, n-hexyloxy, n-octyloxy, and 2-ethylhexyloxy groups. Note that the benzophenone structure is a structure in which two benzene rings are bonded to the carbon atom of a carbonyl group, and "para position of the benzene ring" refers to the para position relative to the carbonyl group to which the two benzene rings are bonded.

[0059] Substituent R 1 The group is preferably an alkoxy group having 1 to 10 carbon atoms, more preferably an alkoxy group having 1 to 8 carbon atoms, and even more preferably a methoxy group.

[0060] Furthermore, the hydrogen atoms at the para position of both benzene rings in the benzophenone structure are substituents R. 1 If substituted with substituent R 1 These may be the same group or different groups.

[0061] In the benzophenone structure, hydrogen atoms other than the para hydrogen atom of at least one benzene ring may be unsubstituted or substituted, but it is preferable that at least one of the ortho hydrogen atoms of at least one benzene ring in the benzophenone structure is substituted with a hydroxyl group. Note that "ortho position of the benzene ring" refers to the ortho position relative to the carbonyl group to which the two benzene rings are bonded.

[0062] In particular, UV absorber (B) has substituent R 1 Preferably, is an alkoxy group having 1 to 8 carbon atoms, and further preferably, at least one hydrogen atom in the ortho position of at least one benzene ring is substituted with a hydroxyl group, wherein substituent R 1It is more preferable that the group is a methoxy group, and furthermore, at least one of the ortho hydrogen atoms of at least one benzene ring is substituted with a hydroxyl group.

[0063] Specifically, the ultraviolet absorber (B) is preferably a compound represented by the following general formula (I).

[0064] [ka]

[0065] In general formula (I), R 10 R represents a hydrogen atom, an alkoxy group having 1 to 10 carbon atoms, or a hydroxyl group. 11 R represents an alkoxy or hydroxyl group having 1 to 10 carbon atoms. 12 , R 13 , R 14 , R 15 Each of these independently represents either a hydrogen atom or a hydroxyl group. That is, R 10 is a hydrogen atom or the above R 1 Represents R 11 The above R 1 It represents.

[0066] R 10 It is preferably a hydrogen atom or an alkoxy group having 1 to 10 carbon atoms, more preferably a hydrogen atom or an alkoxy group having 1 to 8 carbon atoms, and even more preferably a hydrogen atom or a methoxy group.

[0067] R 11 The group is preferably an alkoxy group having 1 to 10 carbon atoms, more preferably an alkoxy group having 1 to 8 carbon atoms, and even more preferably a methoxy group.

[0068] R 12 , R 13 , R 14 , R 15 At least one of them is preferably a hydroxyl group, R 12 , R 13 , R 14 , R 15It is more preferable that two or more of them are hydroxyl groups, 12 and R 13 At least one of and R 14 and R 15 It is even more preferable that at least one of them is a hydroxyl group.

[0069] Preferred examples of the UV absorber (B) include 2,2′-dihydroxy-4-methoxybenzophenone and 2,2′-dihydroxy-4,4′-methoxybenzophenone.

[0070] (Percentage of UV absorber) The content of the ultraviolet absorber (B) in the composition of the present invention is 0.40 to 1.50% by mass. The content of the ultraviolet absorber (B) is preferably 0.50% by mass or more, more preferably 0.60% by mass or more, and even more preferably 0.70% by mass or more. Furthermore, the content is preferably 1.40% by mass or less, more preferably 1.30% by mass or less, and even more preferably 1.20% by mass or less. When the content of the ultraviolet absorber (B) is above the lower limit, it is easier to obtain a composition with good ultraviolet light blocking properties. Furthermore, when the content of the ultraviolet absorber (B) is below the upper limit, it is easier to obtain a composition with suppressed yellowing and good transparency.

[0071] [Dye (C)] The composition of the present invention contains 0.00010 to 0.00080% by mass of dye (C). The dye (C) contained in the composition of the present invention is one or more selected from the group consisting of blue dyes and purple dyes. In this way, by including a specific amount of a specific dye (C), it is possible to suppress yellowness (YI) and obtain a composition with excellent transparency.

[0072] In one embodiment, the blue dye and the purple dye are dyes that have a maximum wavelength in the range of 430 to 670 nm when their absorbance is determined. The blue dye or the purple dye preferably has a maximum wavelength in the range of 490 to 670 nm, and more preferably has a maximum wavelength in the range of 530 to 670 nm. The absorbance of a blue or purple dye can be determined, for example, in the same way as the absorbance of the ultraviolet absorber described above, by subtracting the absorption curve of the resin from the absorption curve of the resin composition obtained by kneading the dye and the resin (the differential absorbance).

[0073] In one embodiment, the blue dye is preferably one or more dyes selected from the group consisting of SolventBlue97, SolventBlue104, DisperseBlue60, and DisperseBlue198, with a color index. Furthermore, in one embodiment, the purple dye is preferably one or more dyes selected from the group consisting of SolventViolet36, SolventViolet13, DisperseViolet31, SolventViolet33, and SolventViolet34, with a color index of SolventViolet36.

[0074] In certain embodiments, the blue or purple dye is preferably an anthraquinone-based dye, such as MACROLEX® BLUE RR or MACROLEX® Violet 3R.

[0075] (Dye ratio) The content of dye (C) in the composition of the present invention is 0.00010 to 0.00080% by mass (i.e., 1.0 ppm to 8.0 ppm by mass). When the content of dye (C) is 0.00010% by mass or more, yellowing can be suppressed, and when it is 0.00080% by mass or less, it is easier to obtain a composition with good transparency. From the above viewpoint, the content of dye (C) is preferably 0.00015% by mass or more, more preferably 0.00020% by mass or more, even more preferably 0.00025% by mass or more, particularly preferably 0.00030% by mass or more, also preferably 0.00070% by mass or less, more preferably 0.00060% by mass or less, and even more preferably 0.00050% by mass or less.

[0076] [Other ingredients] The composition of the present invention may contain resins other than polycarbonate resin (A) and other additives other than ultraviolet absorbers (B) and dyes (C), to the extent that the objectives of the present invention can be achieved.

[0077] Examples of resins other than polycarbonate resin (A) include thermoplastic resins such as polystyrene and polyester. These other resins may be blended one or more in any combination and ratio.

[0078] Other additives may include, for example, stabilizers, release agents, antioxidants, fluorescent whitening agents, pigments, dyes other than dye (C), flame retardants, impact modifiers, antistatic agents, plasticizers, and compatibilizers. These additives may be blended one or more in any combination and ratio.

[0079] (Stabilizer) The composition of the present invention preferably contains 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.

[0080] (Phosphorus stabilizer) The composition of the present invention may contain a phosphorus-based stabilizer. The inclusion of a phosphorus-based stabilizer further improves the hue of the composition and enhances its heat resistance to discoloration. 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 2B 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.

[0081] 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. 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. 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. 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. 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.

[0082] 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.

[0083] Among such phosphite compounds, aromatic phosphite compounds represented by the following general formula (II) or (III) are more preferred because they effectively enhance the heat resistance and color change properties of the composition of the present invention.

[0084] [ka]

[0085] In formula (II), R 20 , R 21 and R 22 These may be the same or different, and each represents an aryl group with 6 to 30 carbon atoms.

[0086] [ka]

[0087] In formula (III), R 23 and R 24 These may be the same or different, and each represents an aryl group with 6 to 30 carbon atoms.

[0088] Among the phosphite compounds represented by the above formula (II), triphenyl phosphite, tris(mononylphenyl) phosphite, and tris(2,4-di-tert-butylphenyl) phosphite are preferred, with tris(2,4-di-tert-butylphenyl) phosphite being more preferred.

[0089] Among the phosphite compounds 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.

[0090] Among phosphite compounds, aromatic phosphite compounds represented by the above formula (III) are more preferred because they have superior hue.

[0091] Specifically, examples include "ADEKA Stab® 1178" and "ADEKA Stab® 2112" from ADEKA Corporation, "JP-351," "JP-360," and "JP-3CP" from Johoku Chemical Industry Co., Ltd., and "Irgafos® 168" from BASF Corporation.

[0092] 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 hue and heat discoloration resistance may be insufficient, and if it exceeds 0.5% by mass, the heat discoloration resistance may worsen or the moist heat stability may decrease. Note that one type of phosphorus-based stabilizer may be included, or two or more types may be included in any combination and ratio.

[0093] (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.

[0094] 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."

[0095] 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. When the content of the phenolic stabilizer is above the lower limit, good antioxidant function can be obtained, and when it is below the upper limit, sufficient antioxidant ability can be obtained without adversely affecting the overall composition. Note that one type of phenolic stabilizer may be included, or two or more types may be included in any combination and ratio.

[0096] <Total light transmittance of the composition> The composition of the present invention preferably blocks ultraviolet light, and from this viewpoint, when the total light transmittance of the composition with a thickness of 2 mm is measured, the maximum wavelength at which the transmittance is 1% or less in the wavelength range of 380 to 420 nm is 396 nm or higher.

[0097] The total light transmittance can be measured using a spectrophotometer with an integrating sphere, with a flat molded product of the composition of the present invention, molded to a thickness of 2 mm, as the measurement sample. The total light transmittance can be measured, for example, by a method conforming to JIS-K7361-1, and an example of specific conditions for the measurement method is as described in the examples.

[0098] The composition of the present invention, when molded as a flat plate with a thickness of 2 mm, yields a transmittance curve (transmittance spectrum) when the total light transmittance in the range of 300 to 700 nm is measured. This curve has a wavelength range on the low wavelength side where the transmittance is 1% or less (i.e., a wavelength range where the transmittance does not exceed 1%) and a wavelength range on the long wavelength side where the transmittance is 78% or more (see Figures 2 to 7). In particular, when considering the wavelength range of 380 to 420 nm, the transmittance on the short wavelength side, at least below 396 nm, is 1% or less, indicating good ultraviolet light blocking.

[0099] In the wavelength range of 380 to 420 nm, the maximum wavelength in the wavelength range with transmittance of 1% or less is preferably 396 to 410 nm, and more preferably 397 to 410 nm. The maximum wavelength in the wavelength range with transmittance of 1% or less may also be 397 nm or higher, 398 nm or higher, 399 nm or higher, 400 nm or higher, 401 nm or higher, 402 nm or higher, 403 nm or higher, 404 nm or higher, or 405 nm or higher.

[0100] Furthermore, in the transmittance curve, the transmittance in the wavelength range of 380 nm or less is preferably 0.80% or less, more preferably 0.50% or less, and even more preferably 0.30% or less.

[0101] In the aforementioned transmittance curve, the transmittance at 400 nm is preferably 5.0% or less, more preferably 2.0% or less, and even more preferably 1.0% or less.

[0102] In the aforementioned transmittance curve, the transmittance at 440 nm is preferably 78.0% or higher, the transmittance at 445 nm is preferably 80.0% or higher, and the transmittance at 450 nm is preferably 85.0% or higher.

[0103] <Total light transmittance of the component in the visible light region> To ensure excellent transparency, when the total light transmittance of a 2 mm thick composition is measured, the minimum value of the total light transmittance in the wavelength range of 460 to 700 nm is usually 81.0% or higher, preferably 85.0% or higher, more preferably 85.6% or higher, and even more preferably 86.0%. There is no particular upper limit; higher is better, and ideally it is 100%.

[0104] <Composition HAZE> In order to ensure excellent transparency, the composition of the present invention preferably has a haze of 1.00 or less, more preferably 0.95 or less, and even more preferably 0.90 or less, for a thickness of 2 mm.

[0105] <Yellowness Index (YI) of the composition> To ensure excellent transparency, the composition of the present invention is preferably as low as possible in a 2 mm thick composition. The preferred YI value varies depending on the type of resin, but generally, 15.0 or less is preferred, 14.0 or less is more preferred, 13.5 or less is even more preferred, 13.0 or less is even more preferred, 12.5 or less is particularly preferred, and 12.0 or less is especially preferred.

[0106] <L*, b* of the composition> To ensure excellent transparency, the composition of the present invention preferably has an L* value of 90 or higher and a b* value of 10.5 or lower in the CIE1976 (L*a*b*) color space for a 2 mm thick composition. More preferably, the L* value is 92 or higher, even more preferably 93 or higher, and particularly preferably 95 or higher. More preferably, the b* value is 10.0 or lower, even more preferably 9.5 or lower, and particularly preferably 9.0 or lower.

[0107] <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 used. For example, a method may be used in which polycarbonate resin (A), ultraviolet absorber (B), dye (C), and other components to be added as needed are pre-mixed using various mixers such as a tumbler or Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, bravender, single-screw extruder, twin-screw extruder, or kneader. In addition, the dye (C) is generally added in the form of a masterbatch that has been pre-mixed with the polycarbonate resin (A). The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0108] The composition of the present invention can be used to produce various molded products by molding pellets obtained by pelletizing the above-described composition using various molding methods. Alternatively, molded products can be produced by directly molding a resin that has been melt-kneaded in an extruder, without going through the pellet stage.

[0109] <Molded products> Molded articles obtained from the composition of the present invention can more effectively absorb and block ultraviolet light, have no problems with gas generation during molding, and possess various excellent mechanical and thermal properties of polycarbonate resin. Therefore, molded articles containing the composition of the present invention can be widely and suitably used in applications where degradation by ultraviolet light is a concern, such as sheets, films, general merchandise, home appliance parts, automobile parts, building materials, and hollow containers. More specifically, preferred applications include eyeglass lenses, sunglass lenses, goggles (for skiing, etc.), safety glasses, lenses for protective faces; roof panels for arcades, indoor swimming pools, carports, sunroofs, etc.; signal lights; sound barriers; automobile side windows; rear windows; solar cell housings; and street light covers. [Examples]

[0110] 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.

[0111] 1.Raw materials The ingredients listed in Table 1 were used as raw materials.

[0112] [Table 1]

[0113] 2. Differential absorbance of UV absorber (B) at 410 nm (△A 410 ) Test specimen 1:A-1:B-1 = 99:1 (W / W) Test specimen 2: A-1: ​​B-2 = 99:1 (W / W) Test specimen 3:A-1:B-3 = 99:1 (W / W) Test specimen 4: A-1 only

[0114] The above components were mixed in a tumbler for 20 minutes according to the above proportions. Then, the mixture was melt-kneaded using a twin-screw extruder (Shibaura Machinery Co., Ltd. "TEM-26SS") at a cylinder temperature of 290°C and a discharge rate of 25 kg / h, and the composition was obtained by strand cutting. The obtained pellets were dried at 100°C for 5 hours in a hot air circulation dryer. Then, using an injection molding machine (Shibaura Machinery Co., Ltd. "EC50SXII") at the same temperature as the extrusion temperature and a mold temperature of 70°C, flat test pieces 1 to 4 with an area of ​​90 × 60 mm and a thickness of 3 mm were obtained.

[0115] The absorption curves of test specimens 1-4 were measured under the following measurement conditions, and the absorbance at 410 nm was determined. • Equipment: UV-Vis-Near-Infrared Spectrophotometer (Shimadzu Corporation "UV-3100PC") • Measurement range: 300-800nm ​​in 2nm increments.

[0116] △A of B-1~B-3 410 Calculation: The values ​​obtained by subtracting the absorbance of test piece 4 at a wavelength of 410 nm from the absorbance of test pieces 1 to 3 at a wavelength of 410 nm are used to determine the ΔA of B-1 to B-3, respectively. 410 This was done. △A of B-1 410 It is 1.36, and △A of B-2 410 It is 1.24, and △A of B-3 410The value was 1.79.

[0117] Furthermore, Figure 1 shows the differential absorption curve of B-1, which is obtained by subtracting the absorbance of test specimen 4 at each wavelength from the absorbance of test specimen 1 at each wavelength.

[0118] 3. Manufacturing of the composition 3.1. Extrusion 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 the cylinder temperature and discharge rate of 25 kg / h as shown in the table, and the composition pellets were obtained by strand cutting.

[0119] 3.2. Molding The obtained pellets were dried at 100°C for 5 hours in a hot air circulation dryer. Then, using an injection molding machine (Shibaura Machine Co., Ltd. "EC50SXII"), stepped flat test pieces with an area of ​​90 × 60 mm and thicknesses of 1 mm, 2 mm, and 3 mm were obtained at the same temperature as the extrusion temperature and a mold temperature of 70°C.

[0120] [Table 2]

[0121] [Table 3]

[0122] 4. Evaluation 4.1. Measurement of Optical Properties Chromaticity (YI, L*, a*, b*) and HAZE value were measured in a 2 mm thick section of the test specimen obtained from the production of the above-described composition using a spectroscopic haze meter (SH 7000, manufactured by Nippon Denshoku Industries Co., Ltd.). In addition, the total light transmittance at wavelengths of 300 nm to 700 nm was measured using an ultraviolet-visible-near-infrared spectrophotometer (UV-3100PC, manufactured by Shimadzu Corporation). Tables 2 and 3 show the chromaticity, HAZE value, minimum total light transmittance in the wavelength range of 460 nm to 700 nm, and the maximum wavelength (cut wavelength) in the wavelength range of 380 nm to 420 nm where the transmittance does not exceed 1%. Furthermore, Figure 2 shows the transmission spectra of total light transmittance in the 300-700 nm range for Examples 1, 2, and 5 and Comparative Examples 1-5, Figure 3 shows an enlarged view of the 380-410 nm range of the transmission spectrum in Figure 2, and Figure 4 shows an enlarged view of the 400-700 nm range of the transmission spectrum in Figure 2. Figure 5 shows the transmission spectra of total light transmittance in the 300-700 nm range for Examples 8 and 9 and Comparative Examples 6-8, Figure 6 shows an enlarged view of the 380-410 nm range of the transmission spectrum in Figure 5, and Figure 7 shows an enlarged view of the 400-700 nm range of the transmission spectrum in Figure 5.

[0123] As shown in Tables 2 and 3, the compositions of the examples exhibit excellent ultraviolet light blocking properties and transparency in the visible light region, and also have good hue, as evidenced by the lower YI compared to the comparative examples.

Claims

1. Polycarbonate resin (A) and 0.40 to 1.50% by mass of ultraviolet absorber (B), A composition comprising 0.00010 to 0.00080% by mass of dye (C), The ultraviolet absorber (B) has a differential absorbance at 410 nm of 1.50 or less, calculated from the following formula (1). The aforementioned dye (C) is one or more selected from the group consisting of blue dyes and purple dyes. A composition having a thickness of 2 mm, wherein when the total light transmittance of the composition is measured, the maximum wavelength at which the transmittance is 1% or less in the wavelength range of 380 to 420 nm is 396 nm or greater. [Differential absorbance at 410 nm] = [Absorbance (β)] - [Absorbance (α)] ...Equation (1) The absorbance (α) is the absorbance at 410 nm in the thickness direction of a molded body obtained by kneading a bisphenol A type polycarbonate resin (i) at an extrusion temperature of 290°C to produce pellets of the resin (i), and then processing the resulting molded body into a 3 mm thick plate by injection molding. The absorbance (β) is the absorbance at 410 nm in the thickness direction of a molded body obtained by kneading the resin (i) and the ultraviolet absorber (B) at an extrusion temperature of 290°C to produce pellets of composition (ii) consisting of 99% by mass of the resin (i) and 1% by mass of the ultraviolet absorber (B), and then processing the resulting molded body into a plate shape with a thickness of 3 mm by injection molding.

2. The ultraviolet absorber (B) has a benzophenone structure, and the hydrogen atom at the para position of at least one benzene ring in the benzophenone structure is substituent R. 1 It is replaced by the R 1 The composition according to claim 1, wherein is an alkoxy group or hydroxyl group having 1 to 10 carbon atoms.

3. In the ultraviolet absorber (B), the substituent R 1 This is an alkoxy group having 1 to 8 carbon atoms. Furthermore, the composition according to claim 2, wherein at least one of the ortho hydrogen atoms of at least one of the benzene rings is modified with a hydroxyl group.

4. The substituent R 1 The composition according to claim 2, wherein is a methoxy group.

5. The composition according to claim 1, wherein when the total light transmittance of the composition with a thickness of 2 mm is measured, the minimum transmittance in the wavelength range of 460 to 700 nm is 81.0% or more.

6. The composition according to claim 1, wherein the dye (C) comprises one or more dyes selected from the group consisting of Solvent Blue 97, Solvent Violet 36, Solvent Blue 104, Disperse Blue 60, Disperse Blue 198, Solvent Violet 13, Disperse Violet 31, Solvent Violet 33, and Solvent Violet 34, with a color index of Solvent Violet 34.

7. A molded article comprising the composition according to any one of claims 1 to 6.

8. A lens comprising the molded body described in claim 7.

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