Resin composition and molded article

Abstract

To provide: a resin composition having excellent weather resistance; and a molded article of the resin composition.SOLUTION: A resin composition includes a synthetic resin and a hindered amine compound.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a molded article thereof, and more particularly to a resin composition having excellent weather resistance and a molded article thereof. [Background technology]

[0002] Weather resistance is required for resin compositions used in articles such as automobiles and building materials. As a method for imparting weather resistance to a resin composition, for example, Patent Document 1 listed below proposes a method of adding a weather resistance agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2004-522791 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the weather resistance agent proposed in Patent Document 1 leaves room for further improvement in terms of the effect of improving weather resistance.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a resin composition having excellent weather resistance and a molded article thereof. [Means for solving the problem]

[0006] As a result of extensive investigations aimed at solving the above problems, the present inventors have found that the above problems can be solved by using a hindered amine compound as a weather resistance agent, and have thus completed the present invention.

[0007] That is, the present invention is a resin composition containing a synthetic resin and a hindered amine compound.

[0008] The present invention also relates to a molded article obtained by molding the above resin composition. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a resin composition having excellent weather resistance and a molded article thereof. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail.

[0011] <Resin composition> The resin composition of the present embodiment contains a synthetic resin and a hindered amine compound.

[0012] The resin composition of this embodiment has excellent weather resistance.

[0013] The synthetic resin may be a thermoplastic resin or a thermosetting resin. Examples of thermoplastic resins include crystalline resins such as polyolefin resins, polyamide resins, polyester resins, polyacetal resins, polylactic acid, and polyphenylene sulfide; amorphous resins such as polycarbonate resins, styrene resins, acrylic resins, urethane resins, halogen-containing resins, petroleum resins, coumarone resins, polyvinyl alcohol, polyvinyl acetate, and polyphenylene oxide; and thermoplastic elastomers. Examples of thermosetting resins include phenol resins, urea resins, melamine resins, epoxy resins, unsaturated polyester resins, alkyd resins, and synthetic rubber. One type of synthetic resin may be used alone, or two or more types may be used in combination. The synthetic resin may be a copolymer or a polymer alloy.

[0014] From the viewpoint of improving the mechanical properties of the resin composition, the synthetic resin preferably contains a polycarbonate resin. Examples of polycarbonate resins include aromatic polycarbonate resins made from aromatic diols such as bisphenol A, and aliphatic polycarbonate resins made from aliphatic diols such as alicyclic diols and isosorbide. From the viewpoint of further improving the mechanical properties of the resin composition, the synthetic resin may contain a polymer alloy containing a polycarbonate resin and an acrylonitrile-butadiene-styrene copolymer, or may contain a polymer alloy containing a polycarbonate resin and a polystyrene resin. When the synthetic resin contains a polymer alloy containing a polycarbonate resin and an acrylonitrile-butadiene-styrene copolymer or a polymer alloy containing a polycarbonate resin and a polystyrene resin, the content of the polycarbonate resin in the polymer alloy can be, for example, 20 mass% or more of the entire polymer alloy. From the viewpoint of improving the mechanical properties of the resin composition, the content of the polycarbonate resin in the polymer alloy is preferably 20 to 95 mass% of the entire polymer alloy, more preferably 30 to 90 mass%, and even more preferably 40 to 80 mass%.

[0015] As described above, the resin composition of the present embodiment includes a hindered amine compound. Examples of the hindered amine compound include a polycondensate of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, 1,2,2,6,6-pentamethyl-4-piperidinol, and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, and a polycondensate of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, 2,2,6,6-tetramethyl-4-piperidinol, and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol. Polycondensation polymer of undecane-3,9-diethanol, 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl palmitate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, tetrakis(1,2,2 ,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, bis(2,2,6,6-tetramethyl-4-piperidyl)·di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)-di(tridecyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,4,4-pentamethyl-4-piperidyl)-2-butyl-2-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, 1- Polycondensation products of (2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol and diethyl succinate, polycondensation products of 1,6-bis(2,2,6,6-tetramethyl-4-piperidylamino)hexane and 2,4-dichloro-6-morpholino-s-triazine, polycondensation products of 1,6-bis(2,2,6,6-tetramethyl-4-piperidylamino)hexane and 2,4-dichloro-6-tert-octylamino-s-triazine, polycondensation products of 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidyl)amino)-s-triazin-6-yl]-1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino)-s-triazin-6-yl]-1,5,8-12-tetraazadodecane, 1,6,11-tris[2,4-bis(N-butyl-N-(2,2,6,6-tetramethyl-4-piperidyl)amino-s-triazin-6-ylamino]undecane, 1,6,11-tris[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino-s-triazin-6-ylamino]undecane, 3,9-bis[1, Examples include 1-dimethyl-2-{tris(2,2,6,6-tetramethyl-4-piperidyloxycarbonyl)butylcarbonyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-bis[1,1-dimethyl-2-{tris(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)butylcarbonyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, bis(1-undecyloxy-2,2,6,6-tetramethylpiperidin-4-yl)carbonate, 2,2,6,6-tetramethyl-4-piperidyl hexadecanoate, and 2,2,6,6-tetramethyl-4-piperidyl octadecanoate.

[0016] From the viewpoint of further improving the weather resistance of the resin composition, the hindered amine compound preferably includes a compound having a 1,2,2,6,6-pentamethyl-4-piperidinyl group. Specific examples of the compound having a 1,2,2,6,6-pentamethyl-4-piperidinyl group include 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, a polycondensate of 1,2,2,6,6-pentamethyl-4-piperidinol and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl palmitate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)-di (tridecyl)-1,2,3,4-butanetetracarboxylate, 1,5,8,12-tetrakis[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino)-s-triazin-6-yl]-1,5,8-12-tetraazadodecane, 1,6,11-tris[2,4-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino-s-triazin-6-ylamino]undecane, 3,9-bis[1,1-dimethyl-2-{tris(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)butylcarbonyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, and the like.From the viewpoint of further improving the weather resistance of the resin composition, the hindered amine compound is preferably a small compound selected from the group consisting of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, a polycondensate of 1,2,2,6,6-pentamethyl-4-piperidinol and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, and 1,2,2,6,6-pentamethyl-4-piperidyl palmitate. It is preferable that the polyether ester compound contains at least one of the above-mentioned compounds, and more preferable that the polyether ester compound contains at least one of the above-mentioned compounds selected from the group consisting of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, a polycondensate of 1,2,2,6,6-pentamethyl-4-piperidinol and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, and a mixture of 1,2,2,6,6-pentamethyl-4-piperidyl stearate and 1,2,2,6,6-pentamethyl-4-piperidyl palmitate.

[0017] In the resin composition of this embodiment, the content of the hindered amine compound can be, for example, 0.001 to 10 parts by mass relative to 100 parts by mass of the synthetic resin. From the viewpoints of improving the weather resistance of the resin composition and sufficiently suppressing bloom or bleeding of the hindered amine compound from the resin composition, the content of the hindered amine compound is preferably 0.005 to 5 parts by mass, more preferably 0.01 to 1 part by mass, and even more preferably 0.02 to 0.5 parts by mass relative to 100 parts by mass of the synthetic resin.

[0018] The resin composition of the present embodiment preferably further contains an ultraviolet absorber, which improves the weather resistance of the resin composition.

[0019] Examples of the ultraviolet absorber include benzoate-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, etc. These may be used alone or in combination of two or more.

[0020] Examples of benzoate-based ultraviolet absorbers include phenyl salicylate, resorcinol monobenzoate, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, octyl (3,5-di-tert-butyl-4-hydroxy)benzoate, dodecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, tetradecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, hexadecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, octadecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, and behenyl (3,5-di-tert-butyl-4-hydroxy)benzoate.

[0021] Examples of benzophenone-based ultraviolet absorbers include 2-hydroxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2,2'-dihydroxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-n-octyloxybenzophenone, 2,2'-dihydroxy-4-n-dodecyloxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-di(n-octyloxy)benzophenone, and 2,2'-dihydroxy-4,4'-di(n-dodecyloxy)benzophenone.

[0022] Examples of triazine-based ultraviolet absorbers include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 2-[4,6-di(4-biphenylyl)-1,3,5-triazin-2-yl]-5-(2-ethylhexyloxy)phenol, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, trioctyl-2,2',2"-((1,3,5-triazine-2,4,6-triyl)triazine), and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol. Examples include tris(3-hydroxybenzene-4-,1-diyl)tripropionate), 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine, and 1,12-bis[2-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy]ethyl]dodecanedioate.

[0023] Examples of the benzotriazole-based ultraviolet absorber include 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-dicumylphenyl)benzotriazole, and 2,2'-methylenedianiline. Polyethylene glycol ester of 2-(2-hydroxy-3-tert-butyl-5-carboxyphenyl)benzotriazole, 2-[2-hydroxy-3-(2-acryloyloxyethyl)-5-methylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-methylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]benzotriazole, -tert-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-amyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(3-methacryloyloxypropyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(3-methacryloyloxypropyl)phenyl]-5-chlorobenzotriazole, 2-[2-hydroxy-4-(2-methacryloyloxymethyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxypropyl)phenyl]benzotriazole, and the like.

[0024] Examples of cyanoacrylate ultraviolet absorbers include ethyl-α-cyano-β,β-diphenylacrylate, 2-ethylhexyl-α-cyano-β,β-diphenylacrylate, methyl-2-cyano-3-methyl-3-(p-methoxyphenyl)acrylate, and pentaerythritol-tetrakis(α-cyano-β,β-diphenylacrylate).

[0025] When the resin composition of the present embodiment contains an ultraviolet absorber, from the viewpoint of further improving the weather resistance of the resin composition, the ultraviolet absorber preferably contains at least one selected from the group consisting of triazine-based compounds, benzophenone-based compounds, and benzotriazole-based compounds, and is preferably selected from the group consisting of 2,2'-methylenebis(4-tert-octyl-6-benzotriazolylphenol), 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexyl)phenyl] ... More preferably, the hydroxybenzophenone further contains at least one selected from the group consisting of 2-hydroxy-4-n-octyloxybenzophenone, 2-[4,6-di(4-biphenylyl)-1,3,5-triazin-2-yl]-5-hexyloxyphenol, 2-[4,6-di(4-octyloxyphenyl)-1,3,5-triazin-2-yl]-5-(2-ethylhexyloxy)phenol, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and 2-hydroxy-4-n-octyloxybenzophenone.

[0026] When the resin composition of this embodiment contains an ultraviolet absorber, the content of the ultraviolet absorber can be, for example, 0.001 to 10 parts by mass relative to 100 parts by mass of the synthetic resin. From the viewpoint of improving the weather resistance of the resin composition and sufficiently suppressing bloom or bleeding of the ultraviolet absorber from the resin composition, the content of the ultraviolet absorber is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass, and even more preferably 0.1 to 2 parts by mass relative to 100 parts by mass of the synthetic resin.

[0027] Furthermore, when the resin composition of this embodiment contains an ultraviolet absorber, the content of the ultraviolet absorber can be, for example, 5 to 20,000 parts by mass relative to 100 parts by mass of the hindered amine compound. From the viewpoint of improving the weather resistance of the resin composition, the content of the ultraviolet absorber is preferably 10 to 10,000 parts by mass, more preferably 100 to 5,000 parts by mass, and even more preferably 200 to 1,000 parts by mass relative to 100 parts by mass of the hindered amine compound.

[0028] The resin composition of this embodiment may further contain additives (hereinafter referred to as "other additives") such as phenolic antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, fatty acid metal salts, lubricants, hydrotalcites, flame retardants, flame retardant aids, fillers, antistatic agents, antifogging agents, fluorescent brighteners, pigments, dyes, etc. The content of the other additives in the resin composition of this embodiment can be set within a range that does not impair the effects of the resin composition of this embodiment, for example.

[0029] The resin composition of this embodiment can be produced, for example, by a method including a blending step of mixing a synthetic resin and a hindered amine compound. The method for mixing the components in the blending step is not particularly limited. Examples include premixing the synthetic resin, hindered amine compound, and, if necessary, the UV absorber and other additives using various mixers such as a tumbler mixer or an FM mixer, followed by melt-kneading using a Banbury mixer, roll mill, Brabender, single-screw kneading extruder, twin-screw kneading extruder, or kneader. The melt-kneading temperature can be, for example, 200°C to 300°C. Alternatively, the resin composition can be produced by premixing the components or by premixing only some of the components, feeding the mixture into an extruder using a feeder, and melt-kneading the mixture. Furthermore, the resin composition can be produced by premixing some of the components, feeding the mixture into an extruder, and melt-kneading the mixture to produce a masterbatch, and then mixing and melt-kneading this masterbatch with the other components.

[0030] <Molded products> The molded article of this embodiment is obtained by molding the above-described resin composition.

[0031] The molded article of this embodiment has excellent weather resistance.

[0032] The method for molding the resin composition is not particularly limited, and examples thereof include extrusion molding, calendar molding, injection molding, roll molding, compression molding, blow molding, and rotational molding.

[0033] Specific examples of the molded article of this embodiment include optical parts, machine parts, electric and electronic parts, automobile parts, resin glass, and building materials. More specific examples include office and office equipment such as printers, personal computers, word processors, keyboards, PDAs (personal digital assistants), telephones, copying machines, facsimiles, ECRs (electronic cash registers), calculators, electronic organizers, cards, holders, and stationery; home appliances such as washing machines, refrigerators, vacuum cleaners, microwave ovens, lighting equipment, game consoles, and irons; AV equipment such as TVs, VTRs, video cameras, radio cassette players, tape recorders, minidiscs, CD players, speakers, and liquid crystal displays; electrical and electronic parts and communication equipment such as connectors, relays, capacitors, switches, printed circuit boards, coil bobbins, semiconductor encapsulation materials, LED encapsulation materials, electric wires, cables, transformers, deflection yokes, distribution boards, and clocks; and optical discs, CD discs, and DVD discs. Examples of materials for automobiles, vehicles, ships, aircraft, buildings, housing and construction materials, civil engineering materials, clothing, curtains, sheets, plywood, synthetic fiber boards, carpets, entrance mats, sheets, buckets, hoses, containers, eyeglasses, bags, cases, goggles, skis, rackets, tents, musical instruments and other daily necessities and sporting goods include glasses, convertible tops, armrests, door trim, rear package trays, carpets, mats, sun visors, wheel covers, mattress covers, airbags, insulation materials, hanging handles, hanging handle straps, wire covering materials, electrical insulation materials, paints, coating materials, covering materials, flooring materials, corner walls, carpets, wallpaper, wall coverings, exterior materials, interior materials, roofing materials, deck materials, wall materials, pillar materials, flooring boards, fence materials, frames and moldings, window and door profiles, shingles, paneling, terraces, balconies, soundproofing boards, heat insulating boards, window materials, etc.

[0034] Further embodiments of the present invention include, for example: [1] Synthetic resin and a hindered amine compound; A resin composition comprising: [2] The resin composition according to [1], wherein the synthetic resin comprises a polycarbonate resin. [3] The resin composition according to [1] or [2], wherein the hindered amine compound includes a compound having a 1,2,2,6,6-pentamethyl-4-piperidinyl group. [4] The resin composition according to any one of [1] to [3], further comprising an ultraviolet absorber. [5] The resin composition according to [4], wherein the ultraviolet absorber comprises at least one selected from the group consisting of triazine-based compounds, benzophenone-based compounds, and benzotriazole-based compounds. [6] A molded article obtained by molding the resin composition according to any one of [1] to [5]. [Example]

[0035] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to the following examples in any way.

[0036] The synthetic resins, hindered amine compounds and ultraviolet absorbers used in the present examples are as follows: [Synthetic resin] Synthetic resin-1: Aromatic polycarbonate resin (Iupilon S-3000, manufactured by Mitsubishi Engineering Plastics Corporation) Synthetic resin-2: Aliphatic polycarbonate resin (Mitsubishi Chemical Corporation, Durabio D7340R) Synthetic resin-3: Acrylonitrile-butadiene-styrene copolymer (Santac AT-08, manufactured by Nippon A&L Co., Ltd.) Synthetic resin-4: Polystyrene resin (Idemitsu Kosan Co., Ltd., Zarec SP130) [Hindered amine compounds] HALS-1: Polycondensation product of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester, 1,2,2,6,6-pentamethyl-4-piperidinol, and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol (CAS number: 101357-36-2) (ADEKA Corporation, ADK STAB LA-63P) HALS-2: A 1:1 (mass ratio) mixture of 1,2,2,6,6-pentamethyl-4-piperidinyl stearate and 1,2,2,6,6-pentamethyl-4-piperidinyl palmitate [UV absorber] UVA-1: 2,2'-methylenebis(4-tert-octyl-6-benzotriazolylphenol) (ADEKA Corporation, ADK STAB LA-31G) UVA-2: 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole (ADEKA Adekastab LA-36) UVA-3: 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole (BASF Tinuvin 329) UVA-4: 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol (ADEKA Corporation, Adekastab LA-46) UVA-5: 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (ADEKA Corporation, ADK STAB LA-F70) UVA-6: 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol (BASF Tinuvin 1577) UVA-7: 2-[4,6-di(4-biphenylyl)-1,3,5-triazin-2-yl]-5-(2-ethylhexyloxy)phenol (BASF Tinuvin 1600) UVA-8: 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (Cytec Cyasorb UV-1164) UVA-9: 2-hydroxy-4-n-octyloxybenzophenone (ADEKA Corporation, ADK STAB 1413)

[0037] (Examples 1 to 672 and Comparative Examples 1 to 6) The synthetic resins, hindered amine compounds, and UV absorbers shown in Tables 1 to 56 were blended in the amounts shown in Tables 1 to 56 and mixed for 30 minutes using a rocking mixer. The blends were then melt-kneaded and granulated using a twin-screw extruder (TEX28V, manufactured by The Japan Steel Works, Ltd.) at a screw speed of 150 rpm and a melt temperature of 280°C, yielding pellets of the resin compositions of Examples 1 to 672 and Comparative Examples 1 to 6. The resulting resin composition pellets were dried at 120°C under a reduced pressure of 4 kPa for 5 hours and then injection-molded at a resin temperature of 280°C and a mold temperature of 50°C to produce 2 mm-thick plate-shaped test specimens. These test specimens were then loaded into a weathering tester (Ametek Co., Ltd., xenon weather meter, Atlas Ci4000) and subjected to weathering tests under the conditions specified in ISO 4892-2. The gloss (gloss value) of each test piece was measured before and during the weather resistance test. The time (h) from the start of the test until the gloss of the test piece became 80% or less of the gloss before the weather resistance test was measured as the "80% gloss retention time," which was used as an index of weather resistance. The gloss of the test piece was measured using a gloss meter (VG-2000, manufactured by Nippon Denshoku Industries Co., Ltd.) at a measurement angle of 60°. In Tables 1 to 56, the unit of the amount of each component is parts by mass.

[0038] [Table 1]

[0039] [Table 2]

[0040] [Table 3]

[0041] [Table 4]

[0042] [Table 5]

[0043]

Table 6

[0044]

Table 7

[0045]

Table 8

[0046]

Table 9

[0047]

Table 10

[0048]

Table 11

[0049]

Table 12

[0050]

Table 13

[0051]

Table 14

[0052]

Table 15

[0053] Table 16

[0054] Table 17

[0055] Table 18

[0056] Table 19

[0057] Table 20

[0058] Table 21

[0059] Table 22

[0060] Table 23

[0061] Table 24

[0062] Table 25

[0063] Table 26

[0064] Table 27

[0065] Table 28

[0066] Table 29

[0067]

Table 30

[0068] Table 31

[0069] Table 32

[0070] Table 33

[0071] Table 34

[0072] Table 35

[0073] Table 36

[0074] Table 37

[0075] Table 38

[0076] Table 39

[0077] Table 40

[0078] Table 41

[0079] Table 42

[0080] Table 43

[0081] Table 44

[0082] Table 45

[0083] Table 46

[0084] [Table 47]

[0085] [Table 48]

[0086] [Table 49]

[0087] [Table 50]

[0088] [Table 51]

[0089] [Table 52]

[0090] [Table 53]

[0091] [Table 54]

[0092] [Table 55]

[0093] [Table 56]

[0094] As a result of the above measurements, the following became clear. (1) The 80% gloss retention time of Examples 1 to 4 and Examples 25 to 132 is longer than the 80% gloss retention time of Comparative Example 1. (2) The 80% gloss retention time of Examples 5 to 8 and Examples 133 to 240 is longer than the 80% gloss retention time of Comparative Example 2. (3) The 80% gloss retention time of Examples 9 to 12 and Examples 241 to 348 is longer than the 80% gloss retention time of Comparative Example 3. (4) The 80% gloss retention time of Examples 13 to 16 and Examples 349 to 456 is longer than the 80% gloss retention time of Comparative Example 4. (5) The 80% gloss retention time of Examples 17 to 20 and Examples 457 to 564 is longer than the 80% gloss retention time of Comparative Example 5. (6) The 80% gloss retention time of Examples 21 to 24 and Examples 565 to 672 is longer than the 80% gloss retention time of Comparative Example 6. From the above (1) to (6), it was found that the resin compositions of Examples 1 to 672 had excellent weather resistance. Therefore, in Tables 1 to 56, Examples 1 to 672 are marked with "Good" in the weather resistance column.

[0095] From the above, it was confirmed that the resin composition of the present invention has excellent weather resistance.

Claims

1. Synthetic resin and a hindered amine compound; A resin composition comprising:

2. The resin composition according to claim 1 , wherein the synthetic resin comprises a polycarbonate resin.

3. 2. The resin composition according to claim 1, wherein the hindered amine compound comprises a compound having a 1,2,2,6,6-pentamethyl-4-piperidinyl group.

4. The resin composition according to claim 1, further comprising an ultraviolet absorber.

5. 5. The resin composition according to claim 4, wherein the ultraviolet absorber comprises at least one selected from the group consisting of triazine-based compounds, benzophenone-based compounds, and benzotriazole-based compounds.

6. A molded article obtained by molding the resin composition according to any one of claims 1 to 5.

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