Compact

Abstract

To provide a compact excellent in weatherability.SOLUTION: A compact comprises a base material that is added with an ultraviolet light absorber indicating a long wavelength-side peak P1 at a wavelength longer than 280 nm in an absorption spectrum, and an ultraviolet cured material that contains a component derived from a photopolymerization initiator indicating a short wavelength-side peak P2 at a wavelength shorter than 280 nm in the absorption spectrum. In the absorption spectrum of the ultraviolet light absorber, the short wavelength-side wavelength F1 of the wavelengths indicating the half-width of the long wavelength-side peak P1, is closer to the long wavelength-side than the long wavelength-side wavelength F2 of the wavelengths indicating the half-width of the short wavelength-side peak P2 in the absorption spectrum of the photopolymerization initiator.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a molded article. [Background technology]

[0002] Transparent synthetic resins such as polycarbonate resin (PC) and polymethyl methacrylate resin (PMMA) have excellent transparency, moldability, and mechanical properties, and are therefore used in many fields, such as lenses (translucent covers) for lamps in automobiles and motorcycles, eyeglass lenses, covers for optical sensors, and various liquid crystal panels. However, molded products made of synthetic resins and the like have problems in that their physical properties deteriorate and their appearance changes when exposed to ultraviolet rays from direct sunlight for long periods of time. To prevent such problems, weather resistance is ensured by applying a composition containing an ultraviolet absorber to the surface of the molded product to form a cured product.

[0003] For example, Patent Document 1 discloses an active energy ray-curable resin composition containing an active energy ray-polymerizable compound (A), an ultraviolet absorber (B), and a photopolymerization initiator (C). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-131481 Summary of the Invention [Problem to be solved by the invention]

[0005] However, such active energy ray-curable resin compositions have a problem in that the ultraviolet absorber is consumed by ultraviolet irradiation when the active energy ray-curable resin composition is cured, and the weather resistance of a substrate (molded article) with a cured coating formed by curing the active energy ray-curable resin composition cannot be sufficiently ensured.

[0006] The present invention has been made in view of the above points, and has as its object to provide a molded article having excellent weather resistance. [Means for solving the problem]

[0007] The molded body of the present invention is a substrate to which an ultraviolet absorber that exhibits a long-wavelength peak at wavelengths longer than 280 nm in an absorption spectrum has been added; and an ultraviolet-cured product containing a component derived from a photopolymerization initiator that exhibits a short-wavelength peak at wavelengths shorter than 280 nm in its absorption spectrum, In the absorption spectrum of the ultraviolet absorber, the shorter wavelength among the wavelengths showing the half width of the long wavelength peak is longer than the longer wavelength among the wavelengths showing the half width of the short wavelength peak in the absorption spectrum of the photopolymerization initiator. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a conceptual diagram showing a molded article of the present invention. [Figure 2] 1 is an example of the absorption spectrum of the ultraviolet absorber and initiator used in the present invention. [Figure 3] 1A to 1C are diagrams illustrating a manufacturing process for a molded article of the present invention. [Figure 4] 1 is a table summarizing the compositions of examples and comparative examples of molded articles of the present invention. [Figure 5] 1 is a table summarizing the wavelengths of ultraviolet absorbers and initiators used in examples and comparative examples of the molded article of the present invention. [Figure 6] 1 is a table summarizing the results of comparison between Examples and Comparative Examples of the molded article of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following, preferred embodiments of the present invention will be described, but they may be modified and combined as appropriate. In the following description and accompanying drawings, substantially the same or equivalent parts are designated by the same reference numerals.

[0010] 1 is a conceptual diagram showing a molded article 10 of the present invention, and is a cross-sectional view of the molded article 10. In this embodiment, the molded article 10 is a lens (translucent cover) for an automobile lamp. Note that the molded article 10 is not limited to a lens for an automobile lamp, and may also be used as a lens for vehicle lamps for motorcycles and bicycles, an optical sensor lens, a street lamp lens, a camera lens, etc.

[0011] As shown in FIG. 1, the molded body 10 includes a substrate 11 to which an ultraviolet absorber has been added, and an ultraviolet-cured product 12 (hereinafter referred to as "cured product 12") containing a component derived from a photopolymerization initiator.

[0012] The substrate 11 is a light-transmitting molded body made of polycarbonate resin (PC). Therefore, the substrate 11 transmits light emitted from an optical device (not shown). Note that the substrate 11 may also be made of hydrophobic synthetic resins such as polymethyl methacrylate resin (PMMA) and polyethylene terephthalate (PET), or hydrophobic materials such as glass.

[0013] An ultraviolet absorber is added to the substrate 11. By adding an ultraviolet absorber to the substrate 11, it is possible to ensure the weather resistance of the substrate 11. In particular, it is possible to prevent the deterioration of physical properties and the change in appearance that occur when the substrate is irradiated with ultraviolet rays for a long period of time.

[0014] As shown by the dashed-dotted line in Figure 2, the ultraviolet absorber used has an absorption spectrum that exhibits a long-wavelength peak P1 (peak P1) at wavelengths longer than 280 nm, and the wavelength F1 on the short-wavelength side of the wavelengths exhibiting the half-width of the long-wavelength peak P1 in the ultraviolet absorber's absorption spectrum is longer than the wavelength F2 on the long-wavelength side of the wavelengths exhibiting the half-width of the short-wavelength peak P2 (peak P2) in the absorption spectrum of the photopolymerization initiator. Furthermore, it is preferable to use an ultraviolet absorber whose long-wavelength peak P1 exhibits a wavelength shorter than 380 nm. Here, the full width at half maximum (FWHM) refers to the wavelength width (nm) at half the height of the peak wavelength.

[0015] Examples of the ultraviolet absorber added to the substrate 11 include triazine-based ultraviolet absorbers such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (peak P1: 340 nm, wavelength F1 on the short wavelength side: 315 nm), 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (peak P1: 357 nm, wavelength F1 on the short wavelength side: 313 nm), and nm), and as a benzotriazole-based ultraviolet absorber, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (peak P1: 347 nm, short wavelength side wavelength F1: 275 nm), 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (peak P1: 320 nm, short wavelength side wavelength F1: 290 nm), etc. can be used.

[0016] The amount of the ultraviolet absorber added to the substrate 11 is preferably 0.2 wt % or more and 1.0 wt % or less with respect to the total amount of the substrate 11. By adding 0.2 wt % or more of the ultraviolet absorber with respect to the total amount of the substrate 11, the weather resistance of the molded body 10 can be further improved.

[0017] In addition to the ultraviolet absorber, various additives such as antioxidants, plasticizers, antistatic agents, nucleating agents, flame retardants, lubricants, impact modifiers, and fluorescent whitening agents may be added to the substrate 11.

[0018] The cured product 12 is formed on a part of the surface of the substrate 11 by curing the ultraviolet-curable composition. Forming the cured product 12 on the surface of the substrate 11 improves the durability of the substrate 11. The cured product 12 may also be formed on the entire surface of the substrate 11.

[0019] The ultraviolet-curable composition contains a polymer compound. Examples of the polymer compound include isobornyl acrylate, trimethylolpropane triacrylate, pentaerythritol (tri / tetra)acrylate (trifunctional), pentaerythritol (tri / tetra)acrylate (tetrafunctional), dipropylene glycol diacrylate, pentaerythritol alkoxytetraacrylate, PO-modified neopentyl glycol diacrylate, pentaerythritol ethoxytetraacrylate, trimethylolpropane ethoxytriacrylate, PEG200 diacrylate, PEG400 diacrylate, ditrimethylolpropane tetraacrylate, 1,6-hexanediol diacrylate, and β-carboxyethyl acrylate. These polymer compounds may be used alone or in combination of two or more.

[0020] A photopolymerization initiator is added as an additive to the ultraviolet-curable composition, meaning that the cured product 12 contains components derived from the photopolymerization initiator.

[0021] The photopolymerization initiator is a radical generator that generates highly active radicals when irradiated with ultraviolet light. These radical species undergo decomposition and react with resin components such as monomers and / or oligomers. This reaction product then reacts with other resin components, causing a chain reaction to proceed. The crosslinking reaction then progresses, increasing the molecular weight and curing the polymer compound to form a cured product 12.

[0022] As the photopolymerization initiator, a photopolymerization initiator can be used that exhibits a short-wavelength peak P2 (peak P2) at a wavelength shorter than 280 nm in its absorption spectrum, as shown by the dotted line in Figure 2, and in which the long-wavelength wavelength F2, among the wavelengths exhibiting the half-width of the short-wavelength peak P2 in the absorption spectrum of the photopolymerization initiator, is shorter than the short-wavelength wavelength F1, among the wavelengths exhibiting the half-width of the long-wavelength peak P1 in the absorption spectrum of the ultraviolet absorber. Furthermore, it is preferable to use a photopolymerization initiator in which the short-wavelength peak P2 exhibits a wavelength longer than 240 nm. Here, the short-wavelength peak P2 refers to the maximum wavelength exhibited by the photopolymerization initiator in its absorption spectrum.

[0023] Examples of photopolymerization initiators added to the ultraviolet-curable composition include 2,2-dimethoxy-2-phenylacetophenone (peak P2: 250 nm, wavelength F2 on the long wavelength side: 265 nm), 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (peak P2: 240 nm, wavelength F2 on the long wavelength side: 250 nm), 1-hydroxycyclohexyl phenyl ketone (peak P2: 240 nm, wavelength F2 on the long wavelength side: 260 nm), 2-hydroxy-2-methyl-1-phenyl Compounds such as 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxymethylpropanone (peak P2: 250 nm, long wavelength F2: 260 nm), 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxymethylpropanone (peak P2: 275 nm, long wavelength F2: 285 nm), and 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (peak P2: 265 nm, long wavelength F2: 270 nm) can be used. These photopolymerization initiators can be used alone or in combination of two or more.

[0024] As described above, the ultraviolet absorber added to the substrate 11 exhibits a long-wavelength peak P1 (peak P1) at wavelengths longer than 280 nm in its absorption spectrum, and the photopolymerization initiator exhibits a short-wavelength peak P2 (peak P2) at wavelengths shorter than 280 nm in its absorption spectrum. Furthermore, in the absorption spectrum of the ultraviolet absorber, the short-wavelength wavelength F1 among the wavelengths exhibiting the half-width of the long-wavelength peak P1 is longer than the long-wavelength wavelength F2 among the wavelengths exhibiting the half-width of the short-wavelength peak P2 in the absorption spectrum of the photopolymerization initiator. Therefore, it is possible to prevent the ultraviolet absorber added to the substrate 11 from being consumed by ultraviolet irradiation when curing the ultraviolet-curable composition. This makes it possible to ensure the remaining amount of ultraviolet absorber in the substrate 11, and form a molded product 10 with excellent weather resistance.

[0025] As the photopolymerization initiator, it is preferable to use an aromatic ketone compound such as 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone, 1-[4-(2-hydroxyethoxyl)-phenyl]-2-hydroxy-methylpropanone, etc. In other words, it is preferable to contain a component derived from an aromatic ketone compound as the photopolymerization initiator in the cured product 12.

[0026] By using an aromatic ketone compound as a photopolymerization initiator, the absorption wavelength of the photopolymerization initiator shifts to the shorter wavelength side, thereby improving the transparency of the cured product 12 and further increasing the amount of UV absorber remaining in the cured product 12.

[0027] The light source of the ultraviolet light to be irradiated onto the photopolymerization initiator can be an LED light source, a high-pressure mercury lamp, a xenon lamp, or a D2 lamp (deuterium lamp). Note that it is preferable to use an LED light source with a wavelength of 250 nm or more and 280 nm or less as the ultraviolet light source.

[0028] By curing the ultraviolet-curable composition by irradiation with deep ultraviolet light having a wavelength of 280 nm or less, the transparency of the cured product 12 can be improved, and the amount of ultraviolet absorber remaining in the cured product 12 can be further increased.

[0029] The remaining amount of the ultraviolet absorber in the substrate 11 is preferably 80% or more, more preferably 85% or more, even more preferably 90% or more, and most preferably 95% or more. The remaining amount of the ultraviolet absorber in the substrate 11 can be determined, for example, by dissolving the coating film in dimethylacetamide and qualitatively and quantitatively measuring the ultraviolet absorber with an NMR device (AvanceCore, manufactured by Bruker).

[0030] The remaining amount of ultraviolet absorber in the substrate 11 is a percentage calculated by dividing the content of ultraviolet absorber remaining in the substrate 11 after forming the cured product 12 by irradiating the ultraviolet-curable composition with ultraviolet rays by the amount of ultraviolet absorber added to the substrate 11 and multiplying the result by 100 (content of ultraviolet absorber remaining in the substrate ÷ amount of ultraviolet absorber added to the substrate × 100).

[0031] It is preferable that an ultraviolet absorber be added as an additive to the ultraviolet-curable composition. By adding an ultraviolet absorber to the ultraviolet-curable composition, the ultraviolet absorber is added to the cured product 12, and the weather resistance of the molded body 10 can be improved. In particular, it is possible to more effectively prevent deterioration in physical properties and changes in appearance that occur due to long-term irradiation with ultraviolet rays.

[0032] The ultraviolet absorber to be added to the ultraviolet-curable composition may be an ultraviolet absorber that exhibits a long-wavelength peak P3 (peak P3) at a wavelength longer than 280 nm in its absorption spectrum, as shown by the two-dot chain line in Figure 2, and in which the short-wavelength wavelength F3 of the wavelengths showing the half-width of the long-wavelength peak in the absorption spectrum of the ultraviolet absorber is longer than the long-wavelength wavelength F2 of the wavelengths showing the half-width of the short-wavelength peak P2 in the absorption spectrum of the photopolymerization initiator. Furthermore, it is preferable to use an ultraviolet absorber in which the long-wavelength peak P3 is shown at a wavelength shorter than 380 nm.

[0033] Examples of the ultraviolet absorber added to the ultraviolet-curable composition include triazine-based ultraviolet absorbers such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (peak P3: 340 nm, short wavelength F3: 315 nm), 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (peak P3: 357 nm, short wavelength F3: 313 nm), 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy) A mixture of 2-hydroxyphenyl-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (peak P3: 320 nm, short wavelength F3: 300 nm), 2-hydroxyphenyl-s-triazine (peak P3: 320 nm, short wavelength F3: 305 nm), and the like can be used as benzotriazole-based ultraviolet absorbers. Examples of such absorbers include 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (peak P3: 347 nm, short wavelength F3: 275 nm), and 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (peak P3: 320 nm, short wavelength F3: 290 nm). The ultraviolet absorber added to the ultraviolet curable composition may be the same as or different from the ultraviolet absorber added to the substrate 11.

[0034] As described above, the ultraviolet absorber added to the ultraviolet-curable composition exhibits a long-wavelength peak P3 (peak P3) at wavelengths longer than 280 nm in its absorption spectrum, while the polymerization initiator exhibits a short-wavelength peak P2 (peak P2) at wavelengths shorter than 280 nm in its absorption spectrum. Furthermore, in the absorption spectrum of the ultraviolet absorber added to the ultraviolet-curable composition, the short-wavelength wavelength F3 among the wavelengths exhibiting the half-width of the long-wavelength peak P3 is longer than the long-wavelength wavelength F2 among the wavelengths exhibiting the half-width of the short-wavelength peak in the absorption spectrum of the photopolymerization initiator. Therefore, the ultraviolet absorber added to the ultraviolet-curable composition can be prevented from being consumed by ultraviolet irradiation when curing the ultraviolet-curable composition. This ensures a sufficient amount of ultraviolet absorber remaining in the cured product 12, allowing for the formation of a molded product 10 with improved weather resistance.

[0035] It is preferable to use a triazine-based compound as the ultraviolet absorber added to the ultraviolet-curable composition.

[0036] By using a triazine-based compound as an ultraviolet absorber to be added to the ultraviolet-curable composition, the absorption region of the ultraviolet absorber shifts to the longer wavelength side, thereby further improving the amount of ultraviolet absorber remaining in the cured product 12.

[0037] The amount of the ultraviolet absorber added to the ultraviolet-curable composition is preferably 0.1 wt% or more and 7.0 wt% or less based on the total amount of the ultraviolet-curable composition. By adding 0.1 wt% or more of the ultraviolet absorber based on the total amount of the ultraviolet-curable composition, the weather resistance of the molded body 10 can be further improved.

[0038] The remaining amount of ultraviolet absorber in molded body 10 is preferably 80% or more, more preferably 85% or more, even more preferably 90% or more, and most preferably 95% or more. The remaining amount of ultraviolet absorber in molded body 10 can be determined, for example, by dissolving the coating film in dimethylacetamide and qualitatively and quantitatively measuring the ultraviolet absorber with an NMR device (AvanceCore, manufactured by Bruker).

[0039] The remaining amount of ultraviolet absorber in the molded body 10 is a percentage calculated by dividing the content of ultraviolet absorber remaining in the molded body 10 after the ultraviolet-curable composition is irradiated with ultraviolet light to form a cured product 12 by the total amount of ultraviolet absorber added to the substrate 11 and the ultraviolet-curable composition, and multiplying the result by 100 (content of ultraviolet absorber remaining in the molded body ÷ total amount of ultraviolet absorber added × 100).

[0040] In addition to the photopolymerization initiator and the ultraviolet absorber, the ultraviolet-curable composition may contain various additives such as an antibacterial agent, an antifungal agent, an antifoaming agent, an antioxidant, an antistatic agent, and a polymerization inhibitor.

[0041] Examples of antibacterial agents include captan, carbendazim, quinomethionate, chlorothalonil, clozolinate, cyprodinil, epoxiconazole, famoxadone, fenarimol, fenbuconazole, fenfuram, fenpiclonil, azoxystrobin, benalaxyl, benomyl, bitertanol, fluazinam, fludioxonil, fluorimide, fluquinconazole, flusulfamide, flutolanil, folpet, Hexachlorobenzene, hexaconazole, ipoconazole, iprodione, kresoxim methyl, manzeb, maneb, mepanipyrim, mepronil, metconazole, metiram, phthalide, procymidone, propineb, quintozene, tecnazene, thifluzamide, thiophenate methyl, thiram, tolclofos methyl, tolylfluanid, triadimefon, triadimenol, triazoxide, triforine, etc. can be used. Inorganic antibacterial agents can also be used, for example, silver, copper, zinc, tin, lead, gold, etc. Furthermore, synthetic antibacterial agents can also be used, for example, polyhexamethylene hyguanide, hydrochloride, benzethonium chloride, alkylpolyaminoethylglycine, benzisothiazoline, etc.

[0042] Examples of the antifungal agent that can be used include sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, p-hydroxybenzoic acid ethyl ester, 1,2-benzisothiazolin-3-one and salts thereof.

[0043] Examples of the defoaming agent that can be used include fatty acid salts, liquid fatty oil sulfates, higher alcohol sulfates, fatty alcohol phosphates, fatty acid amide sulfonates, sulfonates of dibasic fatty acid esters, alkylarylsulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, acrylic polymers, vinyl polymers, and organopolysiloxanes.

[0044] Examples of antioxidants that can be used include phenolic antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants. Examples of phenolic antioxidants that can be used include 2,6-di-tert-butyl-p-cresol, stearyl β-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate, and 1,3,5-trimethyl-2,4,6-tris(3',5'-di-tert-butyl-4-hydroxybenzyl)benzene. Examples of phosphorus-based antioxidants that can be used include tris(2,4-di-tert-butylphenyl)phosphite, diphenylmono(2-ethylhexyl)phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-2-ethylhexylphosphite, distearyl pentaerythritol diphosphite, and tri(mononylphenyl)phosphite. Examples of sulfur-based antioxidants that can be used include dilauryl-3,3'-thiodipropionate and pentaerythritol tetrakis(3-laurylthiopropionate).

[0045] Examples of the antistatic agent that can be used include various cationic antistatic agents having cationic groups such as primary to tertiary amino groups, quaternary ammonium salts, and pyridinium salts; anionic antistatic agents having anionic groups such as sulfonate groups, sulfate ester groups, phosphate ester groups, and phosphonate groups; amphoteric antistatic agents such as amino acid-based and amino sulfate-based; nonionic antistatic agents such as amino alcohol-based, glycerin-based, and polyethylene glycol-based; and polymeric antistatic agents obtained by increasing the molecular weight of the above-mentioned antistatic agents.

[0046] A polymerization inhibitor may be added to prevent the double bond from reacting. Examples of the polymerization inhibitor include hydroquinone (HQ), hydroquinone monomethyl ether (MEHQ), 2,6-di-t-butyl-4-methylphenol (BHT), t-butylcatechol (TBC), and phenol or naphthol derivatives such as 4-methoxy-1-naphthol, phenothiazine derivatives, and nitrosamine salts.

[0047] A method for producing a molded body 10 including a substrate 11 to which an ultraviolet absorber has been added and a cured product 12 containing a component derived from a photopolymerization initiator will be described with reference to FIG.

[0048] First, a UV absorber was added to polycarbonate resin (PC), and the resulting mixture was melt-kneaded and injection-molded to form a substrate 11 (STEP 1). Next, the substrate 11 to be coated was fixed to a coating jig (STEP 2). Next, a UV-curable composition containing a photopolymerization initiator was applied to the surface of the substrate 11 using a coating gun to a uniform thickness of less than 10 μm (STEP 3). The UV-curable composition was irradiated with UV light of 250 nm to 280 nm (STEP 4). Next, the UV-curable composition was cured on the surface of the substrate 11 to form a cured product 12 (STEP 5). As described above, a molded product 10 can be produced, comprising a substrate 11 containing a UV absorber and a cured product 12 containing a component derived from the photopolymerization initiator.

[0049] When applying the ultraviolet-curable composition to the surface of the substrate 11, the composition may be applied to a part of the surface of the substrate 11, or may be applied to the entire surface of the substrate 11. The method for applying the ultraviolet-curable composition is not limited to using a paint gun, and application methods using an inkjet or a dispenser may also be used. [Example]

[0050] The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to these examples. Fig. 4 summarizes the compositions of examples and comparative examples of the molded article 10 of the present invention. Fig. 5 also summarizes the wavelengths of the ultraviolet absorbers and initiators used in the examples and comparative examples of the molded article 10 of the present invention.

[0051] Example 1 Polycarbonate resin (product name: Iupilon H-3000UR, Mitsubishi Engineering Plastics) was melt-mixed with 0.05 wt% of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, ADEKA Corporation) as a UV absorber. After melt-mixing, the mixture was injection molded to obtain a 150 mm x 100 mm, 3.0 mm thick substrate. Next, 97 parts by weight of isobornyl acrylate (product name: IBOA-B, Daicel-Allnex Corporation) as a polymer compound and 3 parts by weight of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, IGM Resins BV) as a photopolymerization initiator were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 1 comprising the substrate and the cured product.

[0052] Example 2 Polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics) was mixed with 0.1 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) as a UV absorber. The mixture was melt-kneaded and injection-molded to obtain a 150 mm x 100 mm, 3.0 mm thick substrate. Next, 98 parts by weight of trimethylolpropane triacrylate (product name: TMPTA, manufactured by Daicel-Allnex Corporation) as a polymer compound and 2 parts by weight of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 2 comprising the substrate and the cured product.

[0053] Example 3 0.15 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 50 parts by weight of pentaerythritol (tri / tetra)acrylate (trifunctional) (product name: PETRA, manufactured by Daicel-Allnex Corporation) and 47 parts by weight of dipropylene glycol diacrylate (product name: DPGDA, manufactured by Daicel-Allnex Corporation) as polymer compounds, and 3 parts by weight of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) as a photopolymerization initiator were added to a 300 mL separable flask equipped with a stirring blade. This mixture was stirred at room temperature for 30 minutes to obtain 100 parts by weight of a UV-curable composition. Next, the UV-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the UV-curable composition was irradiated with 365 nm UV light emitted from a high-pressure mercury lamp to obtain a molded article of Example 3 comprising a substrate and a cured product.

[0054] Example 4 0.05 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 97.95 parts by mass of pentaerythritol alkoxytetraacrylate (product name: EBECRYL 40, manufactured by Daicel-Allnex Corporation) as a polymer compound, 2 parts by mass of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.05 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product names: Tinuvin 400, manufactured by BASF Japan Ltd.) as ultraviolet absorbers were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 4 comprising a substrate and a cured product.

[0055] Example 5 0.1 wt% of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 95.92 parts by mass of PO-modified neopentyl glycol diacrylate (product name: EBECRYL 145, manufactured by Daicel-Allnex Corporation) as a polymer compound, 4 parts by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.08 parts by mass of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405, manufactured by BASF Japan Ltd.) as a UV absorber were added to a 300 mL separable flask equipped with a stirring blade. This mixture was stirred at room temperature for 30 minutes to obtain 100 parts by mass of a UV-curable composition. Next, the UV-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the UV-curable composition was irradiated with 365 nm UV light emitted from a high-pressure mercury lamp to obtain a molded article of Example 5 comprising a substrate and a cured product.

[0056] Example 6 0.1 wt% of 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (product name: Adeka STAB LA-24, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, into a 300 mL separable flask equipped with a stirring blade were added 50 parts by mass of pentaerythritol (tri / tetra)acrylate (tetrafunctional) (product name: PETA, manufactured by Daicel-Allnex Corporation) and 44.95 parts by mass of pentaerythritol ethoxytetraacrylate (product name: EBECRYL 50, manufactured by Daicel-Allnex Corporation) as polymer compounds, 3 parts by mass of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) and 2 parts by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as photopolymerization initiators, and 0.05 parts by mass of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405, manufactured by BASF Japan Ltd.) as an ultraviolet absorber. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 6 comprising a substrate and a cured product.

[0057] Example 7 0.2 wt% of 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (product name: Adeka STAB LA-31RG / Adeka STAB LA-31G, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 96.95 parts by mass of trimethylolpropane ethoxy triacrylate (product name: EBECRYL 160S, manufactured by Daicel-Allnex Corporation) as a polymer compound, 3 parts by mass of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.05 parts by mass of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405, manufactured by BASF Japan Ltd.) as a UV absorber were added to a 300 mL separable flask equipped with a stirring blade. This mixture was stirred at room temperature for 30 minutes to obtain 100 parts by mass of a UV-curable composition. Next, the UV-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the UV-curable composition was irradiated with 365 nm UV light emitted from a high-pressure mercury lamp to obtain a molded article of Example 7 comprising a substrate and a cured product.

[0058] Example 8 0.5 wt% of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 95.92 parts by mass of PEG200 diacrylate (product name: PEG200DA, manufactured by Daicel-Allnex Corporation) as a polymer compound, 4 parts by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.08 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product names: Tinuvin 400) as ultraviolet absorbers. (manufactured by BASF Japan Ltd.) was added. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 8 comprising a substrate and a cured product.

[0059] Example 9 1 wt% of 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (product name: Adeka STAB LA-24, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 94.94 parts by mass of PEG400 diacrylate (product name: PEG400DA, manufactured by Daicel Allnex Corporation) as a polymer compound, 4 parts by mass of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) as a photopolymerization initiator, and 1 part by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator. BASF Japan Ltd.) and 0.06 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product name: Tinuvin 400, manufactured by BASF Japan Ltd.) as an ultraviolet absorber were added. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 9 comprising a substrate and a cured product.

[0060] Example 10 0.8 wt% of 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (product name: Adeka STAB LA-24, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 97.5 parts by mass of trimethylolpropane ethoxy triacrylate (product name: EBECRYL 160S, manufactured by Daicel-Allnex Corporation) as a polymer compound, 2 parts by mass of 2,2-dimethoxy-2-phenylacetophenone (product name: Omnirad 651, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.5 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product names: Tinuvin 400, manufactured by BASF Japan Ltd.) as ultraviolet absorbers were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 10 comprising the substrate and the cured product.

[0061] Example 11 0.9 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 22 parts by mass of PO-modified neopentyl glycol diacrylate (product name: EBECRYL 145, manufactured by Daicel-Allnex Corporation) and 70 parts by mass of ditrimethylolpropane tetraacrylate (product name: EBECRYL 1140, manufactured by Daicel-Allnex Corporation) were added to a 300 mL separable flask equipped with a stirring blade. As a polymer compound, 3 parts by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator, and 5 parts by mass of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405, manufactured by BASF Japan Ltd.) as a UV absorber were added. This mixture was stirred at room temperature for 30 minutes to obtain 100 parts by mass of a UV-curable composition. Next, an ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp, thereby obtaining a molded article of Example 11 comprising a substrate and a cured product.

[0062] Example 12 1 wt% of 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (product name: Adeka STAB LA-31RG / Adeka STAB LA-31G, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 90 parts by mass of 1,6-hexanediol diacrylate (product name: HDDA, manufactured by Daicel Allnex Corporation) as a polymer compound, 3 parts by mass of 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (product name: Omnirad 369, manufactured by IGM Resins BV) as a photopolymerization initiator, and 3 parts by mass of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405) as an ultraviolet absorber. BASF Japan Ltd.) and 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and 4 parts by mass of 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product name: Tinuvin 400, BASF Japan Ltd.) were added. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 12 comprising a substrate and a cured product.

[0063] Example 13 0.9 wt% of 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (product name: Adeka STAB LA-31RG / Adeka STAB LA-31G, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 92 parts by weight of β-carboxyethyl acrylate (product name: β-CEA, manufactured by Daicel-Allnex Corporation) as a polymer compound, 3 parts by weight of 1-hydroxycyclohexyl phenyl ketone (product name: Omnirad 184, manufactured by IGM Resins BV) as a photopolymerization initiator, and 5 parts by weight of 2-hydroxyphenyl-s-triazine (product name: Tinuvin 405, manufactured by BASF Japan Ltd.) as a UV absorber were added to a 300 mL separable flask equipped with a stirring blade. This mixture was stirred at room temperature for 30 minutes to obtain 100 parts by weight of a UV-curable composition. Next, the UV-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the UV-curable composition was irradiated with 365 nm UV light emitted from a high-pressure mercury lamp to obtain a molded article of Example 13 comprising a substrate and a cured product.

[0064] Example 14 1 wt% of 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (product name: Adeka STAB LA-24, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 90 parts by mass of 1,6-hexanediol diacrylate (product name: HDDA, manufactured by Daicel-Allnex Corporation) and 90 parts by mass of β-carboxyethyl acrylate (product name: β-CEA, manufactured by Daicel-Allnex Corporation) as polymer compounds, and 4 parts by mass of 2-hydroxy-2-methyl-1-phenylpropanone (product name: Omnirad 1173 IGM Resins) as a photopolymerization initiator. BASF Japan Ltd.) and 6 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product name: Tinuvin 400, manufactured by BASF Japan Ltd.) were added as ultraviolet absorbers. The mixture was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 14 comprising a substrate and a cured product.

[0065] Example 15 1 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 20 parts by mass of PEG400 diacrylate (product name: PEG400DA, manufactured by Daicel-Allnex Corporation) and 68 parts by mass of pentaerythritol ethoxytetraacrylate (product name: EBECRYL 50, manufactured by Daicel-Allnex Corporation) as polymer compounds, and 5 parts by mass of 1-[4-(2-hydroxyethoxyl)-phenyl]-2-hydroxymethylpropanone (product name: Omnirad 2959 IGM Resins) as a photopolymerization initiator. BASF Japan Ltd.) and 7 parts by mass of 2-[4-[(2-hydroxy-3-dodecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-((2-hydroxy-3-tridecyloxypropyl)-oxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (product name: Tinuvin 400, manufactured by BASF Japan Ltd.) were added as ultraviolet absorbers. The mixture was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 15 comprising a substrate and a cured product.

[0066] Example 16 1 wt% of 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (product name: Adeka STAB LA-24, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 90 parts by weight of ditrimethylolpropane tetraacrylate (product name: EBECRYL 1140, manufactured by Daicel-Allnex Corporation) as a polymer compound, 4 parts by weight of 1-hydroxycyclohexyl phenyl ketone (product name: Omnirad 184, manufactured by IGM Resins BV) as a photopolymerization initiator, and 6 parts by weight of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, manufactured by ADEKA Corporation) as a UV absorber were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by weight of a UV-curable composition. Next, an ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp, thereby obtaining a molded article of Example 16 comprising a substrate and a cured product.

[0067] Example 17 1 wt% of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 89 parts by mass of 1,6-hexanediol diacrylate (product name: HDDA, manufactured by Daicel-Allnex Corporation) as a polymer compound, 3 parts by mass of 2-hydroxy-2-methyl-1-phenylpropanone (product name: Omnirad 1173, manufactured by IGM Resins BV) and 2 parts by mass of 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (product name: Omnirad 127, manufactured by IGM Resins BV) as photopolymerization initiators, and 6 parts by mass of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) as an ultraviolet absorber. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp to obtain a molded article of Example 17 comprising a substrate and a cured product.

[0068] Example 18 1 wt% of 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (product name: Adeka STAB LA-31RG / Adeka STAB LA-31G, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, 90 parts by mass of dipropylene glycol diacrylate (product name: DPGDA, manufactured by Daicel-Allnex Corporation) as a polymer compound, 3 parts by mass of 1-[4-(2-hydroxyethoxyl)-phenyl]-2-hydroxymethylpropanone (product name: Omnirad 2959, manufactured by IGM Resins BV) as a photopolymerization initiator, and 7 parts by mass of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA Corporation) as a UV absorber were added to a 300 mL separable flask equipped with a stirring blade. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of a UV-curable composition. Next, an ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp, thereby obtaining a molded article of Example 18 comprising a substrate and a cured product.

[0069] Example 19 1 wt% of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics). After melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 90 parts by mass of pentaerythritol (tri / tetra)acrylate (tetrafunctional) (product name: PETA, manufactured by Daicel-Allnex Corporation) as a polymer compound, 3 parts by mass of 1-hydroxycyclohexyl phenyl ketone (product name: Omnirad 184, manufactured by IGM Resins BV) as a photopolymerization initiator, and 3 parts by mass of 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (product name: Adeka STAB LA-F70, manufactured by ADEKA CORPORATION) and 4 parts by mass of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (product name: Adeka STAB LA-46, manufactured by ADEKA CORPORATION) as ultraviolet absorbers. This was stirred at room temperature for 30 minutes to obtain 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of the substrate to a uniform thickness of less than 10 μm, and ultraviolet rays of 250 nm or more and 280 nm or less emitted from an LED light source were irradiated onto the ultraviolet-curable composition to obtain a molded article of Example 19 comprising the substrate and the cured product.

[0070] Comparative Example 1 0.05 wt% of [2-hydroxy-4-(octyloxy)phenyl](phenyl)methadone (product name: Adekastab 1413, manufactured by ADEKA Corporation) was added as an ultraviolet absorber to polycarbonate resin (product name: Iupilon H-3000UR, manufactured by Mitsubishi Engineering Plastics), and after melt-kneading, the mixture was injection-molded to obtain a substrate measuring 150 mm x 100 mm and 3.0 mm thick. Next, a 300 mL separable flask equipped with a stirring blade was charged with 95.95 parts by mass of PO-modified neopentyl glycol diacrylate (product name: EBECRYL 145, manufactured by Daicel-Allnex Corporation) as a polymer compound, 4 parts by mass of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (product name: Omnirad 819, manufactured by IGM Resins BV) as a photopolymerization initiator, and 0.05 parts by mass of a mixture of 80% β-[3-(2-H-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl]-propionic acid-poly(ethylene glycol) 300-ester, 38% bis{β-[3-(2-H-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl]-propionic acid}-poly(ethylene glycol) 300-ester, and 12% polyethylene glycol (product name: Tinuvin) as an ultraviolet absorber. 1130 (manufactured by BASF Japan Ltd.) was added. This was stirred at room temperature for 30 minutes, yielding 100 parts by mass of an ultraviolet-curable composition. Next, the ultraviolet-curable composition was applied to the surface of a substrate to a uniform film thickness of less than 10 μm, and the ultraviolet-curable composition was irradiated with 365 nm ultraviolet light emitted from a high-pressure mercury lamp, yielding a molded article of Comparative Example 1 comprising a substrate and a cured product.

[0071] 5, the molded article of Comparative Example 1, unlike the Examples, is a molded article comprising a substrate to which an ultraviolet absorber whose absorption spectrum shows a peak at a wavelength shorter than 280 nm (275 nm) has been added, and a cured product containing the ultraviolet absorber whose absorption spectrum shows a peak at a wavelength shorter than 280 nm (270 nm) and a component derived from a photopolymerization initiator whose absorption spectrum shows a peak at a wavelength longer than 280 nm (300 nm). Furthermore, the ultraviolet absorber added to the substrate has a shorter wavelength of 300 nm among the wavelengths showing the half width of the long-wavelength peak in its absorption spectrum, the ultraviolet absorber added to the cured product has a shorter wavelength of 290 nm among the wavelengths showing the half width of the long-wavelength peak in its absorption spectrum, and the photopolymerization initiator has a longer wavelength of 325 nm among the wavelengths showing the half width of the short-wavelength peak in its absorption spectrum. Therefore, in the absorption spectrum of the ultraviolet absorber, the shorter wavelength among the wavelengths showing the half width of the long wavelength peak is shorter than the longer wavelength among the wavelengths showing the half width of the short wavelength peak in the absorption spectrum of the photopolymerization initiator.

[0072] (Weather resistance evaluation) The molded articles of Examples 1 to 19 and Comparative Example 1 were each placed in a Super UV Tester (device name: SUV-W161, manufactured by Iwasaki Electric) for 700 hours, and their weather resistance was evaluated on a five-level scale of A to E. The evaluation was graded as follows: A: a decrease in peel strength at the coating film-substrate interface of less than 3% and a change in yellowness index ΔT i from the initial value of less than 0.5%; B: a decrease in peel strength at the coating film-substrate interface of 3% to less than 5% and a change in yellowness index ΔYI from the initial value of 0.5% to less than 0.7%; C: a decrease in peel strength at the coating film-substrate interface of 5% to less than 7% and a change in yellowness index ΔYI from the initial value of 0.7% to less than 1.0%; D: a decrease in peel strength at the coating film-substrate interface of 7% to less than 10% and a change in yellowness index ΔYI from the initial value of 1.0% to less than 1.2%; and E: a decrease in peel strength at the coating film-substrate interface of 10% or more and a change in yellowness index ΔYI from the initial value of 1.2% or more. Figure 6 summarizes the weather resistance evaluation results for Examples 1 to 19 and Comparative Example 1.

[0073] (Transparency Assessment) The molded articles of Examples 1 to 19 and Comparative Example 1 were evaluated for transparency on a 5-point scale (A to E) by measuring the change in diffuse light transmittance (ΔH) from the initial state according to JIS K 7136. A spectroscopic haze meter (device name: SH7000, manufactured by Nippon Denshoku Industries Co., Ltd.) was used as the measuring device. The evaluation was performed as follows: A when the change in diffuse light transmittance (ΔH) from the initial state was less than 0.5%, B when it was 0.5% or more and less than 0.7%, C when it was 0.7% or more and less than 1.0%, D when it was 1.0% or more and less than 1.2%, and E when it was 1.2% or more. FIG. 6 shows the transparency evaluation results for Examples 1 to 19 and Comparative Example 1.

[0074] (Evaluation of remaining amount of ultraviolet absorber) The coating film of each of the molded articles of Examples 1 to 19 and Comparative Example 1 was dissolved in dimethylacetamide, and the remaining amount of UV absorber was evaluated using an NMR apparatus (AvanceCore, manufactured by Bruker) for qualitative and quantitative measurement using a 5-point scale (A to E). The remaining amount of UV absorber was evaluated as A if it was 95% or more, B if it was 90% or more but less than 95%, C if it was 85% or more but less than 90%, D if it was 80% or more but less than 85%, and E if it was less than 80%. FIG. 6 shows a summary of the evaluation results of the remaining amount of UV absorber for Examples 1 to 19 and Comparative Example 1.

[0075] As is clear from Figure 6, Examples 1 to 19 are molded articles comprising a substrate to which an ultraviolet absorber has been added, the absorption spectrum of which shows a long-wavelength peak P1 (Peak P1) at wavelengths longer than 280 nm, and an ultraviolet-cured product containing a component derived from a photopolymerization initiator, the absorption spectrum of which shows a short-wavelength peak P2 (Peak P2) at wavelengths shorter than 280 nm, and in which the wavelength F1 on the short-wavelength side of the wavelengths showing the half-width of the long-wavelength peak P1 in the absorption spectrum of the ultraviolet absorber is longer than the wavelength F2 on the long-wavelength side of the wavelengths showing the half-width of the short-wavelength peak P2 in the absorption spectrum of the photopolymerization initiator.It is clear that Examples 1 to 19 can ensure excellent weather resistance supported by the remaining amount of ultraviolet absorber, as well as excellent transparency.

[0076] From the results of Examples 3 to 19, it is clear that better weather resistance can be ensured when an ultraviolet absorber that exhibits a long-wavelength peak P3 (peak P3) at a wavelength longer than 280 nm in its absorption spectrum, and in which the short-wavelength wavelength F3 among the wavelengths exhibiting the half-width of the long-wavelength peak P3 in the absorption spectrum of the ultraviolet absorber, is longer than the long-wavelength wavelength F2 among the wavelengths exhibiting the half-width of the short-wavelength peak P2 in the absorption spectrum of the photopolymerization initiator, is applied to an ultraviolet-cured product.

[0077] Furthermore, in Examples 7 to 19, the evaluation results of the weather resistance were B or higher, which shows that better weather resistance can be ensured by adding 0.2 wt % or more of an ultraviolet absorber to the substrate.

[0078] Furthermore, in Examples 10 to 19, the weather resistance evaluation results were B or higher, which shows that better weather resistance can be ensured by adding 0.5 wt% or more of an ultraviolet absorber to the ultraviolet-cured product.

[0079] Furthermore, in Examples 13 to 19, the evaluation results for transparency were B or higher, and the evaluation results for the remaining amount of ultraviolet absorber were C or higher. This shows that by using an aromatic ketone compound as a photopolymerization initiator, it is possible to ensure better transparency and further improve the remaining amount of ultraviolet absorber.

[0080] Furthermore, in Examples 16 to 19, the evaluation results for the remaining amount of ultraviolet absorber were B or higher, which shows that the remaining amount of ultraviolet absorber can be further improved by using an ultraviolet absorber composed of a triazine compound as the ultraviolet absorber to be added to the ultraviolet-cured product.

[0081] Furthermore, in Example 19, the evaluation result of the remaining amount of ultraviolet absorber was A, which shows that the remaining amount of ultraviolet absorber can be further improved by using an LED light source with a wavelength of 250 nm or more and 280 nm or less as a curing method (forming method) for the ultraviolet-cured product.

[0082] In contrast, in Comparative Example 1, the weather resistance evaluation showed a peel strength reduction rate of 10% or more at the coating film-substrate interface and a yellowness index change ΔYI of 1.2% or more from the initial stage, indicating that sufficient weather resistance was not ensured. Furthermore, the transparency evaluation showed a change in diffuse light transmittance (ΔH) of 1.2% or more from the initial stage, indicating that sufficient transparency was not ensured. Furthermore, the remaining amount of UV absorber was evaluated, indicating that the remaining amount was less than 80%, indicating that a sufficient amount of UV absorber was not ensured.

[0083] As described above, according to the molded article and the method for producing the same of the present invention, excellent weather resistance can be ensured. [Explanation of symbols]

[0084] 10 Molded body 11 Base material 12 Ultraviolet cured product

Claims

1. a substrate to which an ultraviolet absorber that exhibits a long-wavelength peak at wavelengths longer than 280 nm in an absorption spectrum has been added; and an ultraviolet-cured product containing a component derived from a photopolymerization initiator that exhibits a short-wavelength peak at a wavelength shorter than 280 nm in an absorption spectrum, a molded product, in which, in the absorption spectrum of the ultraviolet absorber, a wavelength on the shorter wavelength side among wavelengths showing a half width of the long wavelength side peak is longer than a wavelength on the longer wavelength side among wavelengths showing a half width of the short wavelength side peak in the absorption spectrum of the photopolymerization initiator.

2. The molded article according to claim 1, The ultraviolet-cured product contains an ultraviolet absorber that exhibits a long-wavelength peak at wavelengths longer than 280 nm in its absorption spectrum, A molded product in which, in the absorption spectrum of the ultraviolet absorber added to the ultraviolet-cured product, the shorter wavelength among the wavelengths showing the half width of the long wavelength peak is longer than the longer wavelength among the wavelengths showing the half width of the short wavelength peak in the absorption spectrum of the photopolymerization initiator.

3. The molded article according to claim 1, The amount of the ultraviolet absorber added is 0.2 wt % or more and 1.0 wt % or less based on the total amount of the base material.

4. The molded article according to claim 2, A molded product, wherein the amount of the ultraviolet absorber added to the ultraviolet cured product is 0.5 wt % or more and 7.0 wt % or less based on the total amount of the ultraviolet cured product.

5. The molded article according to claim 1, The molded article contains a component derived from an aromatic ketone compound, wherein the component derived from the photopolymerization initiator is a component derived from an aromatic ketone compound.

6. The molded article according to claim 2, The molded article wherein the ultraviolet absorber added to the ultraviolet cured product is a triazine-based compound.

7. The molded article according to claim 1, A molded article in which the amount of the ultraviolet absorber remaining in the substrate is 80% or more.

8. The molded article according to claim 2, A molded article in which the remaining amount of the ultraviolet absorber in the molded article is 80% or more.

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