Resin composition, molded article and method for producing resin composition

Abstract

To provide a resin composition which is excellent in weather resistance, a molded article and a method for producing a resin composition.SOLUTION: A resin composition contains a synthetic resin, and a hindered amine-based light stabilizer.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] In recent years, there has been a demand for materials having high transparency and high light scattering properties as components for automobile bumpers, etc. As such a material, for example, Patent Document 1 below discloses a resin composition containing a light diffusing agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-83660 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the resin composition proposed in Patent Document 1 above has room for further improvement in terms of weather resistance.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a resin composition having excellent weather resistance, a molded article thereof, and a method for producing the resin composition. [Means for solving the problem]

[0006] As a result of intensive investigations aimed at solving the above problems, the present inventors have found that the above problems can be solved by using a hindered amine-based light stabilizer as a weather resistance improver, 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-based light stabilizer.

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

[0009] Furthermore, the present invention is a method for producing a resin composition, which includes a blending step of blending a synthetic resin and a hindered amine-based light stabilizer. Effect of the Invention

[0010] According to the present invention, it is possible to provide a resin composition having excellent weather resistance, a molded article thereof, and a method for producing the resin composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described in detail.

[0012] <Resin composition> The resin composition of the present embodiment contains a synthetic resin and a hindered amine-based light stabilizer.

[0013] The resin composition of the present embodiment has excellent weather resistance.

[0014] The synthetic resin may be a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include crystalline resins such as polyolefin resins, polyamide resins, polyester resins, polyacetal resins, polylactic acid, and polyphenylene sulfide, polycarbonate resins, styrene resins, acrylic resins, urethane resins, halogen-containing resins, petroleum resins, coumarone resins, polyvinyl alcohol, polyvinyl acetate, and polyphenylene oxide, and non-crystalline resins and thermoplastic elastomers. Examples of the thermosetting resin include phenol resins, urea resins, melamine resins, epoxy resins, unsaturated polyester resins, alkyd resins, and synthetic rubber. The synthetic resin may be contained alone or in combination of two or more types. The synthetic resin may be a copolymer or a polymer alloy.

[0015] The synthetic resin is preferably a thermoplastic resin, more preferably a crystalline resin, and further preferably contains a polyolefin-based resin.

[0016] Examples of polyolefin resins include polyethylene resins such as low density polyethylene, linear low density polyethylene, high density polyethylene, crosslinked polyethylene, and ultra-high molecular weight polyethylene, polypropylene (PP) resins such as homopolypropylene, random copolymer polypropylene, block copolymer polypropylene, impact copolymer polypropylene, high impact copolymer polypropylene, and maleic anhydride modified polypropylene, α-olefin polymers such as polybutene-1, cycloolefin polymer, poly-3-methyl-1-butene, poly-3-methyl-1-pentene, and poly-4-methyl-1-pentene, and α-olefin copolymers such as ethylene-methyl methacrylate copolymer and ethylene-vinyl acetate copolymer. From the viewpoint of making the resin composition excellent in heat resistance, the polyolefin resin preferably contains at least one selected from the group consisting of polyethylene resins and polypropylene resins, and more preferably contains a polypropylene resin. The molecular weight, degree of polymerization, density, softening point, proportion of insoluble matter in a solvent, degree of stereoregularity, presence or absence of catalyst residue, types and blending ratios of raw monomers, type of catalyst used in polymerization (e.g., Ziegler catalyst, metallocene catalyst, etc.), etc. of the polyolefin resin are not particularly limited and are selected appropriately.

[0017] In the resin composition of the present embodiment, the synthetic resin preferably contains an elastomer. In this case, the resin composition has excellent impact resistance. Here, examples of the elastomer include synthetic rubbers such as isoprene rubber, butadiene rubber, acrylonitrile-butadiene copolymer rubber, styrene-butadiene copolymer rubber, fluororubber, and silicone rubber, and thermoplastic elastomers such as polyolefin-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyvinyl chloride-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and polyamide-based thermoplastic elastomers. Among these, thermoplastic elastomers are preferred from the viewpoint of improving the processability of the resin composition and reducing the weight of the molded product obtained by molding the resin composition. In addition, among the thermoplastic elastomers, polyolefin-based thermoplastic elastomers are particularly preferred. In the resin composition of the present embodiment, when the synthetic resin contains an elastomer, the content of the elastomer can be, for example, 5 to 60% by mass of the entire synthetic resin, preferably 10 to 50% by mass, and more preferably 15 to 45% by mass.

[0018] In the resin composition of the present embodiment, the synthetic resin may contain a recycled resin.

[0019] The recycled resin is a resin obtained by crushing a molded product of a synthetic resin for the purpose of reuse. Examples of the recycled resin include post-consumer recycled (PCR) resin, post-industrial recycled (PIR) resin, and in-process crushed recycled (regrind) resin. In the resin composition of the present embodiment, the recycled resin preferably includes at least one selected from the group consisting of PCR high-density polyethylene resin, PIR high-density polyethylene resin, regrind high-density polyethylene resin, PCR linear low-density polyethylene resin, PIR linear low-density polyethylene resin, regrind linear low-density polyethylene resin, PCR low-density polyethylene resin, PIR low-density polyethylene resin, regrind low-density polyethylene resin, PCR polypropylene resin, PIR polypropylene resin, and regrind polypropylene resin, more preferably includes at least one selected from the group consisting of PCR high-density polyethylene resin, PIR high-density polyethylene resin, regrind high-density polyethylene resin, PCR polypropylene resin, PIR polypropylene resin, and regrind polypropylene resin, and even more preferably includes at least one selected from the group consisting of PCR high-density polyethylene resin, PIR high-density polyethylene resin, PCR polypropylene resin, and PIR polypropylene resin.

[0020] In the resin composition of the present embodiment, when the synthetic resin contains a recycled resin, the content of the recycled resin may be, for example, 5% by mass or more of the total synthetic resin. The content of the recycled resin is preferably 5 to 100% by mass, more preferably 10 to 90% by mass, and further preferably 20 to 80% by mass of the total synthetic resin.

[0021] As described above, the resin composition of the present embodiment contains a hindered amine-based light stabilizer. Examples of the hindered amine-based light stabilizer 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, 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, and ... ]Polycondensation product 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 of the 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-piperidylhexadecanoate, 2,2,6,6-tetramethyl-4-piperidyloctadecanoate, and the like are listed.

[0022] The content of the hindered amine light stabilizer may 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 hindered amine light stabilizer from the resin composition, the content of the hindered amine light stabilizer is preferably 0.005 to 5 parts by mass, more preferably 0.01 to 1 part by mass, and further preferably 0.02 to 0.5 parts by mass relative to 100 parts by mass of the synthetic resin.

[0023] The resin composition of the present embodiment preferably further contains a filler, in which case the mechanical properties of the resin composition become excellent.

[0024] Examples of the filler include talc, mica, calcium carbonate, calcium oxide, calcium hydroxide, magnesium carbonate, magnesium hydroxide, magnesium oxide, magnesium sulfate, aluminum hydroxide, barium sulfate, glass powder, glass fiber, clay, dolomite, silica, alumina, potassium titanate whisker, wollastonite, fibrous magnesium oxysulfate, etc., and the particle size (fiber diameter, fiber length, and aspect ratio in the case of fibrous form) can be appropriately selected and used. Among these fillers, talc is particularly preferably used because it has an excellent effect of imparting rigidity and is easily available. In addition, the filler can be surface-treated as necessary.

[0025] When the resin composition of the present embodiment contains a filler, the content of the filler can be, for example, 1 to 50 parts by mass relative to 100 parts by mass of the synthetic resin. From the viewpoint of further improving the mechanical properties of the resin composition, the content of the filler is preferably 2 to 25 parts by mass, more preferably 3 to 20 parts by mass, and further preferably 5 to 15 parts by mass relative to 100 parts by mass of the synthetic resin.

[0026] The resin composition of the present embodiment preferably further contains a light dispersant, in which case the resin composition has excellent light scattering properties.

[0027] The light scattering agent is not particularly limited as long as it is a material that scatters light. Specific examples of the light scattering agent include, for example, zinc oxide, titanium oxide, silver, barium sulfate, zinc sulfide, white lead, antimony oxide, and cerium oxide. From the viewpoint of further improving the light scattering property of the resin composition, it is preferable that the light scattering agent contains at least one selected from the group consisting of zinc oxide and titanium oxide, and more preferably contains zinc oxide. In addition, from the viewpoint of further improving the light scattering property of the resin composition, it is preferable that the light scattering agent contains at least one selected from the group consisting of ultrafine zinc oxide and ultrafine titanium oxide, and more preferably contains ultrafine zinc oxide.

[0028] When the resin composition of the present embodiment contains a light dispersing agent, the content of the light dispersing agent can be, for example, 1 to 50 parts by mass relative to 100 parts by mass of the synthetic resin. From the viewpoint of further improving the light scattering property of the resin composition, the content of the light dispersing agent is preferably 0.1 to 20 parts by mass, more preferably 0.5 to 10 parts by mass, and further preferably 1 to 5 parts by mass relative to 100 parts by mass of the synthetic resin.

[0029] The resin composition of the present embodiment may further contain an ultraviolet absorbing agent. In this case, the resin composition has even better weather resistance. Examples of the ultraviolet absorbing agent include benzoate-based ultraviolet absorbing agents, benzophenone-based ultraviolet absorbing agents, triazine-based ultraviolet absorbing agents, benzotriazole-based ultraviolet absorbing agents, and cyanoacrylate-based ultraviolet absorbing agents. These may be used alone or in combination of two or more.

[0030] Examples of the 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, behenyl (3,5-di-tert-butyl-4-hydroxy)benzoate, and 2,4-di-tert-butylphenyl (3,5-di-tert-butyl-4-hydroxy)benzoate.

[0031] Examples of the 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.

[0032] 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-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine. 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, 1,12-bis[2-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy]ethyl]dodecanedioate, and the like.

[0033] Examples of the benzotriazole-based ultraviolet absorbers 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'-methylenediphenyl. (4-tert-octyl-6-benzotriazolylphenol), 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 -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, 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.

[0034] 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).

[0035] When the resin composition of the present 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 further preferably 0.1 to 2 parts by mass relative to 100 parts by mass of the synthetic resin.

[0036] The resin composition of the present embodiment may further contain a nucleating agent. In this case, the resin composition has excellent mechanical properties. Examples of the nucleating agent include compounds that promote the crystallization of synthetic resins. Specific examples of the nucleating agent include sodium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate, lithium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate, dihydroxyaluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate, and hydroxyaluminum. Metal salts of aromatic phosphates such as bis[2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate], metal salts of carboxylic acids such as sodium benzoate, aluminum 4-tert-butylbenzoate, sodium adipate, disodium bicyclo[2.2.1]heptane-2,3-dicarboxylate, and calcium cyclohexane-1,2-dicarboxylate, dibenzylidene sorbitol, bis(methylbenzylidene)sorbitol, bis(3,4-dimethylbenzylidene)sorbitol, and bis(p-ethylbenzyl) sorbitol. and polyol derivatives such as N,N',N"-tris[2-methylcyclohexyl]-1,2,3-propanetricarboxamide, N,N',N"-tricyclohexyl-1,3,5-benzenetricarboxamide, N,N'-dicyclohexylnaphthalenedicarboxamide, and 1,3,5-tri(dimethylisopropylamino)benzene. From the viewpoint of improving the mechanical properties of the resin composition of this embodiment, the nucleating agent preferably contains an aromatic phosphate metal salt, more preferably contains at least one selected from the group consisting of sodium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate and lithium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate, and even more preferably contains sodium 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate.

[0037] When the resin composition of the present embodiment contains a nucleating agent, the content of the nucleating agent 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 mechanical properties of the resin composition and sufficiently suppressing the occurrence of blooming and migration of the nucleating agent, the content of the nucleating agent is preferably 0.005 to 5 parts by mass, more preferably 0.01 to 3 parts by mass, even more preferably 0.02 to 1 part by mass, and even more preferably 0.05 to 0.5 parts by mass relative to 100 parts by mass of the synthetic resin.

[0038] The resin composition of the present embodiment may further contain a colorant. Examples of the colorant include a pigment, a dye, and a resin master batch containing these.

[0039] Specific examples of pigments include Pigment Red 1, 2, 3, 9, 10, 17, 22, 23, 31, 38, 41, 48, 49, 88, 90, 97, 112, 119, 122, 123, 144, 149, 166, 168, 169, 170, 171, 177, 179, 180, 184, 185, 192, 200, 202, 209, 215, and 216. , 217, 220, 223, 224, 226, 227, 228, 240, 254; Pigment Orange 13, 31, 34, 36, 38, 43, 46, 48, 49, 51, 52, 55, 59, 60, 61, 62, 64, 65, 71; Pigment Yellow 1, 3, 12, 13, 14, 16, 17, 20, 24, 55, 60, 73, 81, 83, 86 , 93, 95, 97, 98, 100, 109, 110, 113, 114, 117, 120, 125, 126, 127, 129, 137, 138, 139, 147, 148, 150, 151, 152, 153, 154, 166, 168, 175, 180, 185; Pigment Green 7, 10, 36; Pigment Blue 15, 15:1, 15:2 , 15:3, 15:4, 15:5, 15:6, 22, 24, 29, 56, 60, 61, 62, 64; Pigment Violet 1, 15, 19, 23, 27, 29, 30, 32, 37, 40, 50, white pigment, carbon black, dark gray pigment, gray pigment, beige pigment, light beige pigment, light gray pigment, green pigment, etc.

[0040] Specific examples of dyes include azo dyes, anthraquinone dyes, indigoid dyes, triarylmethane dyes, xanthene dyes, alizarin dyes, acridine dyes, stilbene dyes, thiazole dyes, naphthol dyes, quinoline dyes, nitro dyes, indamine dyes, oxazine dyes, phthalocyanine dyes, and cyanine dyes.

[0041] When the resin composition of the present embodiment contains a colorant, the content of the colorant can be, for example, 0.00001 to 1 part by mass relative to 100 parts by mass of the resin. The content of the colorant is preferably 0.0001 to 0.1 parts by mass, more preferably 0.0005 to 0.05 parts by mass, and more preferably 0.001 to 0.03 parts by mass relative to 100 parts by mass of the resin.

[0042] The resin composition of the present embodiment may further contain additives such as phenol-based antioxidants, phosphorus-based antioxidants, thioether-based antioxidants, fatty acid metal salts, lubricants, hydrotalcites, flame retardants, flame retardant assistants, antistatic agents, antifogging agents, fluorescent brighteners, etc., as necessary. The content of the other additives in the resin composition of the present embodiment may be within a range that does not impair the effect of the resin composition of the present embodiment.

[0043] <Method of producing resin composition> The method for producing the resin composition of the present embodiment includes a blending step of blending a synthetic resin and a hindered amine-based light stabilizer.

[0044] According to the method for producing a resin composition of the present embodiment, a resin composition having excellent weather resistance can be produced.

[0045] The method of mixing each component in the compounding step is not particularly limited, and examples thereof include a method of premixing synthetic resin, hindered amine light stabilizer, and, if necessary, filler, light dispersant, ultraviolet absorber, nucleating agent, colorant, and other additives using various mixers such as a tumbler mixer or FM mixer, and then melt-kneading using a Banbury mixer, roll mill, Brabender, single-screw kneading extruder, twin-screw kneading extruder, kneader, etc. Here, the temperature of melt-kneading can be, for example, 200°C to 300°C. In addition, the resin composition may be produced by not premixing each component, or by premixing only a portion of the components, feeding the mixture to an extruder using a feeder, and melt-kneading the mixture. Furthermore, a master batch may be produced by premixing a portion of the components and feeding the mixture to an extruder and melt-kneading the mixture, and the resin composition may be produced by mixing the master batch with other components and melt-kneading the mixture.

[0046] <Molded products> The molded article of the present embodiment is obtained by molding the above-mentioned resin composition.

[0047] The molded article of this embodiment has excellent weather resistance.

[0048] 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.

[0049] Specific examples of the molded article of the present 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, copiers, 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, minidisks, 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; optical disks, CD disks, DVD disks, and other electrical and electronic parts and communication equipment. Examples of the materials used in automobiles, vehicles, ships, aircraft, buildings, housing and construction materials, civil engineering materials, clothing, curtains, sheets, plywood, synthetic fiber boards, rugs, entrance mats, sheets, buckets, hoses, containers, glasses, bags, cases, goggles, skis, rackets, tents, musical instruments and other daily necessities and sporting goods include: Particularly suitable examples of the molded article of this embodiment include automobile parts such as bumpers, chassis, bodies, lampshades, and light guide tubes.

[0050] The total light transmittance of the molded article of this embodiment can be, for example, 1 to 100%. From the viewpoint of making the molded article excellent in light scattering property, the total light transmittance of the molded article is preferably 10 to 90%, more preferably 30 to 80%, and further preferably 40 to 70%. Here, the total light transmittance is measured in accordance with the provisions of ISO 13468.

[0051] Further embodiments of the present invention include, for example: [1] A resin composition comprising a synthetic resin and a hindered amine-based light stabilizer. [2] The resin composition according to [1], wherein the synthetic resin comprises a polyolefin-based resin. [3] The resin composition according to [1] or [2], wherein the synthetic resin contains an elastomer. [4] The resin composition according to any one of [1] to [3], further comprising a filler. [5] The resin composition according to any one of [1] to [4], further comprising a light dispersing agent. [6] A molded article obtained by molding the resin composition according to any one of [1] to [5]. [7] The molded product according to [6], having a total light transmittance of 40 to 70%. [8] A method for producing a resin composition, comprising a blending step of blending a synthetic resin and a hindered amine-based light stabilizer. EXAMPLES

[0052] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0053] The synthetic resins, hindered amine light stabilizers, fillers, light dispersants, ultraviolet absorbers and nucleating agents used in the present examples are as follows. [Synthetic resin] Synthetic resin-1: Homopolypropylene, manufactured by Prime Polymer Co., Ltd., product name "Prime Polypro J107G" Synthetic resin-2: Impact copolymer polypropylene, manufactured by Prime Polymer, product name "Prime Polypro J707G" Synthetic resin-3: Thermoplastic elastomer, manufactured by Mitsui Chemicals, product name "Tafmer PN-20300" Synthetic resin-4: Thermoplastic elastomer, manufactured by Dow Chemical Company, product name "Engage 8842" [Hindered amine light stabilizers] HALS-1: ADEKA, product name "ADEKA STAB LA-77Y" HALS-2: ADEKA, product name "ADEKA STAB LA-72" HALS-3: ADEKA, product name "ADEKA STAB LA-57" HALS-4: ADEKA, product name "ADEKA STAB LA-52" HALS-5: A mixture of 2,2,6,6-tetramethyl-4-piperidyl stearate and 2,2,6,6-tetramethyl-4-piperidyl palmitate HALS-6: ADEKA, product name "ADEKA STAB LA-63P" HALS-7: ADEKA, product name "ADEKA STAB LA-81" HALS-8: Mixture of 1,2,2,6,6-pentamethyl-4-piperidyl stearate and 1,2,2,6,6-pentamethyl-4-piperidyl palmitate HALS-9: ADEKA, product name "ADEKA STAB LA-40MP" HALS-10: ADEKA, product name "ADEKA STAB LA-402AF" HALS-11: ADEKA, product name "ADEKA STAB LA-502XP" HALS-12: ADEKA, product name "ADEKA STAB LA-704AF" [Filler] Filler-1: Talc, manufactured by Matsumura Sangyo Co., Ltd., product name "Crown Talc P" Filler-2: Talc, manufactured by Nippon Talc Co., Ltd., product name "Microace P-8" [Light dispersing agent] Light dispersion agent-1: Ultrafine zinc oxide, manufactured by Ishihara Sangyo Kaisha, Ltd., product name "FZO-50" [Ultraviolet absorber] UV absorber-1: Hexadecyl (3,5-di-tert-butyl-4-hydroxy)benzoate UV absorber-2: 2,4-di-tert-butylphenyl (3,5-di-tert-butyl-4-hydroxy)benzoate UV absorber-3: ADEKA Corporation, product name "ADEKA STAB LA-36" UV absorber-4: ADEKA Corporation, product name "ADEKA STAB LA-31" UV absorber-5: ADEKA Corporation, product name "ADEKA STAB LA-24" UV absorber-6: ADEKA Corporation, product name "ADEKA STAB LA-29" UV absorber-7: ADEKA Corporation, product name "ADEKA STAB LA-32" UV absorber-8: ADEKA Corporation, product name "ADEKA STAB LA-46" UV absorber-9: ADEKA Corporation, product name "ADEKA STAB LA-F70" UV absorber-10: ADEKA Corporation, product name "ADEKA STAB 1413" [Nucleating agent] Nucleating agent-1: ADEKA Corporation, product name "ADEKA STAB NA-11" Nucleating agent-2: ADEKA Corporation, product name "ADEKA STAB NA-21" Nucleating agent-3: ADEKA Corporation, product name "ADEKA STAB NA-27" Nucleating agent-4: ADEKA Corporation, product name "ADEKA STAB NA-71"

[0054] (Examples 1 to 1664) The synthetic resins, hindered amine-based light stabilizers, fillers, light dispersants, ultraviolet absorbers and nucleating agents shown in Tables 1 to 208 were blended in the amounts shown in Tables 1 to 208, 0.05 parts by mass of a phenol-based antioxidant (tetrakis[methylene-3-(3',5'-tert-butyl-4'-hydroxyphenyl)propionate]methane), 0.1 parts by mass of a phosphorus-based antioxidant (tris(2,4-di-tert-butylphenyl)phosphite), and 0.05 parts by mass of a fatty acid metal salt (calcium stearate) were blended, and then mixed for 30 minutes using a rocking mixer (RM-150 manufactured by Aichi Electric Co., Ltd.). The resulting mixture was melt-kneaded using a twin-screw extruder (TEX-28V manufactured by Japan Steel Works, Ltd.) under processing conditions of a resin temperature of 230°C and a screw speed of 150 rpm, and then granulated to obtain a pellet-shaped resin composition. In Tables 1 to 208, the unit of blending amount is parts by mass.

[0055] (Examples 1665 to 3328) In addition, except that 0.025 parts by mass of carbon black was added as a colorant, synthetic resin, hindered amine-based light stabilizer, filler, light dispersant, UV absorber, nucleating agent, phenol-based antioxidant, phosphorus-based antioxidant and fatty acid metal salt were added in the same amounts as in Examples 1 to 1664, and then mixed, melt-kneaded and granulated under the same conditions as in Examples 1 to 1664 to obtain a pellet-shaped resin composition.

[0056] (Examples 3329 to 4992) In addition, synthetic resin, hindered amine-based light stabilizer, filler, light dispersant, UV absorber, nucleating agent, phenol-based antioxidant, phosphorus-based antioxidant and fatty acid metal salt were blended in the same amounts as in Examples 1 to 1664, except that 0.002 parts by mass of Pigment Blue 29 was blended as a colorant.Then, the mixture was mixed, melt-kneaded and granulated under the same conditions as in Examples 1 to 1664 to obtain a pellet-shaped resin composition.

[0057] <Characteristics evaluation> The resin compositions of Examples 1 to 1664 were dried at 80°C for 8 hours, and then injection molded using an injection molding machine (EC-100-2A manufactured by Toshiba Machine Co., Ltd.) under conditions of a resin temperature of 230°C and a mold temperature of 40°C to prepare plate-shaped test pieces with a thickness of 2 mm. The test pieces were introduced into a weather resistance tester (Ametek Co., Ltd. xenon weather meter, Atlas Ci4000), and weather resistance tests were performed under conditions specified in ISO4892-2. Here, the glossiness (gloss value) of each test piece before and during the weather resistance test was measured, and the time (h) from the start of the test until the glossiness of the test piece became 80% or less of the glossiness before the weather resistance test was measured as the "80% gloss retention time". Here, the glossiness of the test piece was measured using a gloss meter (VG-2000 manufactured by Nippon Denshoku Kogyo Co., Ltd.) at a measurement angle of 60°. Here, as a control sample, a weather resistance test was carried out under the same conditions as for each of the examples, except that the hindered amine light stabilizer was not blended, and the 80% gloss retention time was measured. As a result, it was revealed that the resin compositions of Examples 1 to 1664 had a longer 80% gloss retention time than the respective control samples, and had excellent weather resistance. Therefore, in Tables 1 to 208, the column for weather resistance is also marked with "○". The 80% gloss retention time was also measured under the same conditions as above for the resin compositions of Examples 1665 to 4992. As a result, it was revealed that the resin compositions of Examples 1665 to 4992 had a longer 80% gloss retention time than the respective control samples, and thus had excellent weather resistance.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061]

Table 4

[0062]

Table 5

[0063]

Table 6

[0064]

Table 7

[0065]

Table 8

[0066]

Table 9

[0067]

Table 10

[0068]

Table 11

[0069]

Table 12

[0070]

Table 13

[0071]

Table 14

[0072]

Table 15

[0073]

Table 16

[0074]

Table 17

[0075]

Table 18

[0076]

Table 19

[0077]

Table 20

[0078]

Table 21

[0079]

Table 22

[0080]

Table 23

[0081]

Table 24

[0082]

Table 25

[0083]

Table 26

[0084]

Table 27

[0085]

Table 28

[0086]

Table 29

[0087]

Table 30

[0088]

Table 31

[0089]

Table 32

[0090]

Table 33

[0091]

Table 34

[0092]

Table 35

[0093]

Table 36

[0094]

Table 37

[0095]

Table 38

[0096]

Table 39

[0097]

Table 40

[0098]

Table 41

[0099]

Table 42

[0100]

Table 43

[0101]

Table 44

[0102]

Table 45

[0103]

Table 46

[0104]

Table 47

[0105]

Table 48

[0106]

Table 49

[0107]

Table 50

[0108]

Table 51

[0109]

Table 52

[0110]

Table 53

[0111]

Table 54

[0112]

Table 55

[0113]

Table 56

[0114]

Table 57

[0115]

Table 58

[0116]

Table 59

[0117]

Table 60

[0118]

Table 61

[0119]

Table 62

[0120]

Table 63

[0121]

Table 64

[0122]

Table 65

[0123]

Table 66

[0124]

Table 67

[0125]

Table 68

[0126]

Table 69

[0127]

Table 70

[0128]

Table 71

[0129]

Table 72

[0130]

Table 73

[0131]

Table 74

[0132]

Table 75

[0133]

Table 76

[0134]

Table 77

[0135]

Table 78

[0136]

Table 79

[0137]

Table 80

[0138]

Table 81

[0139]

Table 82

[0140]

Table 83

[0141]

Table 84

[0142]

Table 85

[0143]

Table 86

[0144]

Table 87

[0145]

Table 88

[0146]

Table 89

[0147]

Table 90

[0148]

Table 91

[0149]

Table 92

[0150]

Table 93

[0151]

Table 94

[0152]

Table 95

[0153]

Table 96

[0154]

Table 97

[0155]

Table 98

[0156]

Table 99

[0157]

Table 100

[0158]

Table 101

[0159]

Table 102

[0160]

Table 103

[0161]

Table 104

[0162]

Table 105

[0163]

Table 106

[0164]

Table 107

[0165]

Table 108

[0166]

Table 109

[0167]

Table 110

[0168]

Table 111

[0169]

Table 112

[0170]

Table 113

[0171]

Table 114

[0172]

Table 115

[0173]

Table 116

[0174]

Table 117

[0175]

Table 118

[0176]

Table 119

[0177]

Table 120

[0178]

Table 121

[0179]

Table 122

[0180]

Table 123

[0181]

Table 124

[0182]

Table 125

[0183]

Table 126

[0184]

Table 127

[0185]

Table 128

[0186]

Table 129

[0187]

Table 130

[0188]

Table 131

[0189]

Table 132

[0190]

Table 133

[0191]

Table 134

[0192]

Table 135

[0193]

Table 136

[0194]

Table 137

[0195]

Table 138

[0196]

Table 139

[0197]

Table 140

[0198]

Table 141

[0199]

Table 142

[0200]

Table 143

[0201]

Table 144

[0202]

Table 145

[0203]

Table 146

[0204]

Table 147

[0205]

Table 148

[0206]

Table 149

[0207]

Table 150

[0208]

Table 151

[0209]

Table 152

[0210]

Table 153

[0211]

Table 154

[0212]

Table 155

[0213]

Table 156

[0214]

Table 157

[0215]

Table 158

[0216]

Table 159

[0217]

Table 160

[0218]

Table 161

[0219]

Table 162

[0220]

Table 163

[0221]

Table 164

[0222]

Table 165

[0223]

Table 166

[0224]

Table 167

[0225]

Table 168

[0226]

Table 169

[0227]

Table 170

[0228]

Table 171

[0229]

Table 172

[0230]

Table 173

[0231]

Table 174

[0232]

Table 175

[0233]

Table 176

[0234]

Table 177

[0235]

Table 178

[0236]

Table 179

[0237]

Table 180

[0238]

Table 181

[0239]

Table 182

[0240]

Table 183

[0241]

Table 184

[0242]

Table 185

[0243]

Table 186

[0244]

Table 187

[0245]

Table 188

[0246]

Table 189

[0247]

Table 190

[0248]

Table 191

[0249]

Table 192

[0250]

Table 193

[0251]

Table 194

[0252]

Table 195

[0253]

Table 196

[0254]

Table 197

[0255]

Table 198

[0256]

Table 199

[0257]

Table 200

[0258] [Table 201]

[0259] [Table 202]

[0260] [Table 203]

[0261] [Table 204]

[0262] [Table 205]

[0263] [Table 206]

[0264] [Table 207]

[0265] [Table 208]

[0266] From the above, it was confirmed that the resin composition of the present invention has excellent weather resistance.

Claims

1. A resin composition comprising a synthetic resin and a hindered amine-based light stabilizer.

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

3. The resin composition according to claim 1 , wherein the synthetic resin comprises an elastomer.

4. The resin composition according to claim 1 , further comprising a filler.

5. The resin composition according to claim 1 , further comprising a light dispersing agent.

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

7. The molded article according to claim 6, having a total light transmittance of 40 to 70%.

8. A method for producing a resin composition, comprising a blending step of blending a synthetic resin and a hindered amine-based light stabilizer.

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