Resin compositions, pellets, and molded articles

Abstract

To provide a resin composition capable of providing a molded article having excellent impact resistance and weather resistance and to provide a pellet and the molded article.SOLUTION: There is provided a resin composition which comprises 1 to 10 pts.mass of an acrylic copolymer (C), 0.1 to 1.0 pt.mass of an ultraviolet absorber (D) and 0.1 to 1.0 pt.mass of a hindered amine-based light stabilizer (E) based on the total 100 pts.mass of a polycarbonate resin (A) and a methacrylic copolymer (B), wherein the methacrylic copolymer (B) contains a styrene unit and an alkyl methacrylate unit, and the acrylic copolymer (C) contains an alkyl methacrylate unit and an alkyl acrylate unit.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to resin compositions, pellets, and molded articles. In particular, it relates to resin compositions having polycarbonate resin as a main component. [Background technology]

[0002] Polycarbonate resin (PC resin) is a resin with excellent transparency, heat resistance, weather resistance, mechanical properties, and electrical properties, and is widely used in materials for automobiles, aircraft, electrical and electronic equipment, housing materials, medical devices, and other industrial fields. Traditionally, the development of polymer alloys by blending polycarbonate resin with other types of resins has been carried out in a wide range of fields with the aim of further improving the functionality and reducing the cost of materials. For example, in the automotive field, the development of alloys by blending polycarbonate resin with copolymers (styrene-based resins) that have polystyrene or styrene as structural units has been widely carried out and is actually used in automotive exterior materials such as front air dams, pillars, roof rails, spoilers, rear gate garnishes, and door mirror housings.

[0003] Patent documents 1 to 4 describe alloys obtained by compounding polycarbonate resin with styrene-based resin. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2017 / 078273 [Patent Document 2] Japanese Patent Publication No. 2015-078284 [Patent Document 3] Japanese Patent Publication No. 2013-147651 [Patent Document 4] International Publication No. 2021 / 039895 [Overview of the project] [Problems that the invention aims to solve]

[0005] As mentioned above, styrene-based resins are often added to polycarbonate resins to improve their various properties. In particular, styrene-based resins are added to improve the moldability of polycarbonate resins. Here, it is conceivable to use a methacrylic copolymer containing styrene units and alkyl methacrylate units as the styrene-based resin. While the styrene units in a methacrylic copolymer containing styrene units and alkyl methacrylate units improve the compatibility with polycarbonate resin, the impact resistance is not sufficient. Furthermore, in molded articles formed from a resin composition containing a polycarbonate resin as described above and a methacrylic copolymer containing styrene units and alkyl methacrylate units, it is sometimes required to improve the weather resistance of the molded article. The present invention aims to solve these problems and to provide a resin composition, pellets, and molded articles that can provide molded articles with excellent impact resistance and weather resistance. [Means for solving the problem]

[0006] Based on the above problems, the inventors conducted research and found that the above problems can be solved by combining a polycarbonate resin with a methacrylic copolymer containing styrene units and alkyl methacrylate units, along with a predetermined acrylic copolymer, an ultraviolet absorber, and a hindered amine-based light stabilizer. Specifically, the above problem was solved by the following means. <1> A resin composition comprising 100 parts by mass of a total of polycarbonate resin (A) and methacrylic copolymer (B), 1 to 10 parts by mass of acrylic copolymer (C), 0.1 to 1.0 parts by mass of ultraviolet absorber (D), and 0.1 to 1.0 parts by mass of hindered amine-based light stabilizer (E), wherein the methacrylic copolymer (B) contains styrene units and alkyl methacrylate units, and the acrylic copolymer (C) contains alkyl methacrylate units and alkyl acrylate units. <2>The resin composition according to <1>, wherein the number average molecular weight of the hindered amine light stabilizer (E) is 1000 or more. <3>The resin composition according to <1> or <2>, wherein the hindered amine light stabilizer (E) contains an NR-type hindered amine light stabilizer represented by the formula (HALS-1). Formula (HALS-1)

Chemical formula

Chemical formula

Chemical formula

[0007] We have made it possible to provide a resin composition, as well as pellets and molded articles, that offer excellent impact resistance and weather resistance. [Modes for carrying out the invention]

[0008] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). Note that the following embodiment is illustrative for explaining the present invention, and the present invention is not limited to this embodiment. In this specification, "~" is used to mean that the numbers before and after it are included as the lower and upper limits, respectively. In this specification, all physical properties and characteristic values ​​shall be those at 23°C unless otherwise specified. If the measurement methods, etc., described in the standards shown herein differ from year to year, unless otherwise specified, the standards as of January 1, 2022 shall apply.

[0009] The resin composition of this embodiment comprises 100 parts by mass of a total of polycarbonate resin (A) and methacrylic copolymer (B), 1 to 10 parts by mass of acrylic copolymer (C), 0.1 to 1.0 parts by mass of ultraviolet absorber (D), and 0.1 to 1.0 parts by mass of hindered amine-based light stabilizer (E), wherein the methacrylic copolymer (B) contains styrene units and alkyl methacrylate units, and the acrylic copolymer (C) contains alkyl methacrylate units and alkyl acrylate units. By adopting this configuration, a resin composition can be obtained that provides molded products with excellent impact resistance and weather resistance. Furthermore, a resin composition can be obtained that exhibits excellent stability during stagnation molding. In addition, a resin composition can be obtained that provides molded products with excellent color development. Furthermore, a resin composition can be obtained that provides molded products with excellent resistance to humidity and heat.

[0010] <Polycarbonate resin (A)> The polycarbonate resin is not particularly limited as long as it contains a carbonate ester bond-containing -[OR-OC(=O)]- unit in the molecular main chain (where R is a hydrocarbon group, specifically an aliphatic group, an aromatic group, or a group containing both an aliphatic and an aromatic group, and furthermore, a linear or branched structure). In this embodiment, the polycarbonate resin is preferably an aromatic polycarbonate resin, and more preferably a polycarbonate resin having a bisphenol skeleton. By using such a polycarbonate resin, better heat resistance and toughness can be achieved. In this embodiment, in the polycarbonate resin having a bisphenol skeleton, it is preferable that 90 mol% or more of the total constituent units are bisphenol skeleton-containing units, and more preferably that 90 mol% or more of the total constituent units are bisphenol A-derived units.

[0011] Furthermore, the viscosity-average molecular weight (Mv) of the polycarbonate resin is preferably 10,000 or more, more preferably 12,000 or more, and even more preferably 15,000 or more. Setting it above the lower limit tends to further improve the durability of the resulting molded product. The upper limit of the viscosity-average molecular weight (Mv) of the polycarbonate resin is preferably 50,000 or less, more preferably 40,000 or less, even more preferably 30,000 or less, and even more preferably 25,000 or less. Setting it below the upper limit tends to further improve the moldability of the molded product. The viscosity-average molecular weight (Mv) is calculated using methylene chloride as the solvent, determining the intrinsic viscosity [η] (unit: dL / g) at 25°C using an Ubbelohde viscometer, and then using Schnell's viscosity formula, i.e., η = 1.23 × 10⁻⁶-4 ×Mv 0.83 means the value calculated from. When using two or more polycarbonate resins, it is the viscosity average molecular weight of the mixture.

[0012] Also, the melt volume rate (MVR) of the polycarbonate resin used in this embodiment at 260°C and a load of 5 kg is 10 cm 3 / 10 min or more is preferable, and 70 cm 3 / 10 min or less is preferable, 65 cm 3 / 10 min or less is more preferable, 50 cm 3 / 10 min or less is further preferable, 40 cm 3 / 10 min or less is even more preferable, 30 cm 3 / 10 min or less is even more preferably, 20 cm 3 / 10 min or less is even more preferably. MVR is measured according to the description of the examples described later. When using two or more polycarbonate resins, it is the MVR of the mixture.

[0013] In addition to the above, details of the polycarbonate resin can be considered in accordance with the descriptions in paragraphs 0013 to 0041 of JP-A-2021-084942, and this content is incorporated herein.

[0014] In the resin composition of this embodiment, the polycarbonate resin content is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, even more preferably 55% by mass or more, and even more preferably 60% by mass or more. Setting it above the lower limit tends to further improve the mechanical strength, heat resistance, and transparency maintenance effect of the polycarbonate resin composition. Furthermore, in the resin composition of this embodiment, the polycarbonate resin content is preferably 90% by mass or less, more preferably 85% by mass or less, even more preferably 80% by mass or less, even more preferably 75% by mass or less, and even more preferably 70% by mass or less. Setting it below the upper limit tends to further improve the good fluidity, low water absorption rate, weather resistance, high hardness, and low specific gravity (lightweight) effect of the polycarbonate resin composition. The resin composition of this embodiment may contain only one type of polycarbonate resin, or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0015] <Methacrylic copolymer (B)> The resin composition of this embodiment contains a methacrylic copolymer (B) comprising styrene units and alkyl methacrylate units. The inclusion of methacrylic copolymer (B) tends to further improve the good fluidity, low water absorption rate, weather resistance, high hardness, and low specific gravity (lightweight) effects of the polycarbonate resin composition. The alkyl group in the alkyl methacrylate unit contained in the methacrylic copolymer (B) is preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, an ethyl group, or a propyl group, and even more preferably a methyl group. In this embodiment, the methacrylic copolymer (B) preferably contains 60% by mass or more of styrene units, more preferably 65% ​​by mass or more, even more preferably 70% by mass or more, even more preferably 75% by mass or more, and preferably 90% by mass or less, and even more preferably 85% by mass or less. On the other hand, the methacrylic copolymer (B) preferably contains 10% by mass or more of alkyl methacrylate units (preferably methyl methacrylate units), more preferably 15% by mass or more, and preferably 40% by mass or less, even more preferably 35% by mass or less, even more preferably 30% by mass or less, and even more preferably 25% by mass or less. In this embodiment, the methacrylic copolymer (B) preferably has a total of styrene units and alkyl methacrylate units (preferably methyl methacrylate units) accounting for 90% by mass or more of all constituent units excluding the terminal groups of the methacrylic copolymer (B), more preferably 95% by mass or more, and even more preferably 97% by mass or more.

[0016] The weight-average molecular weight of the methacrylic copolymer (B) is preferably 50,000 or more, more preferably 100,000 or more, even more preferably 150,000 or more, even more preferably 180,000 or more, and even more preferably 200,000 or more. Setting it above the lower limit tends to further improve the effect of maintaining the mechanical strength of the polycarbonate resin composition. The weight-average molecular weight of the methacrylic copolymer (B) is also preferably 400,000 or less, more preferably 350,000 or less, even more preferably 320,000 or less, even more preferably 300,000 or less, and even more preferably 280,000 or less. Setting it below the upper limit tends to further improve the compatibility with polycarbonate (A) and the effect of maintaining the fluidity of the resin composition. The weight-average molecular weight is a polystyrene-equivalent value measured by GPC (gel permeation chromatography).

[0017] The content of methacrylic copolymer (B) in the resin composition of this embodiment is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, even more preferably 20 parts by mass or more, and even more preferably 25 parts by mass or more, based on 100 parts by mass of the total of polycarbonate resin (A) and methacrylic copolymer (B). Setting the content above the lower limit tends to further improve the good fluidity, low water absorption rate, weather resistance, high hardness, and low specific gravity (lightweight) effects of the resin composition. Furthermore, the upper limit of the content of methacrylic copolymer (B) is preferably 60 parts by mass or less, more preferably 50 parts by mass or less, even more preferably 45 parts by mass or less, even more preferably 40 parts by mass or less, and even more preferably 35 parts by mass or less, based on 100 parts by mass of the total of polycarbonate resin (A) and methacrylic copolymer (B). Setting the content below the upper limit tends to further improve the mechanical strength, heat resistance, and transparency maintenance effect of the resin composition. The resin composition of this embodiment may contain only one type of methacrylic copolymer (B), or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0018] <Acrylic copolymer (C)> The resin composition of this embodiment includes an acrylic copolymer (C) containing alkyl methacrylate units and alkyl acrylate units. The inclusion of the acrylic copolymer (C) tends to further improve impact resistance due to the increased interfacial adhesion strength between the polycarbonate resin (A) and the methacrylic copolymer (B).

[0019] The alkyl group in the alkyl methacrylate unit contained in the acrylic copolymer (C) is preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, an ethyl group, or a propyl group, and even more preferably a methyl group. The alkyl group in the alkyl acrylate unit contained in the acrylic copolymer (C) is preferably an alkyl group having 2 to 8 carbon atoms, more preferably an alkyl group having 3 to 6 carbon atoms, more preferably a propyl group, a butyl group, or a pentyl group, and even more preferably a butyl group.

[0020] In this embodiment, the acrylic copolymer (C) preferably contains 10% by mass or more of alkyl methacrylate units (preferably methyl methacrylate units), more preferably 15% by mass or more, preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 35% by mass or less, even more preferably 30% by mass or less, and even more preferably 25% by mass or less. On the other hand, the acrylic copolymer (C) preferably contains 50% by mass or more of alkyl acrylate units (preferably butyl acrylate units), more preferably 60% by mass or more, even more preferably 65% ​​by mass or more, even more preferably 70% by mass or more, even more preferably 75% by mass or more, and preferably 90% by mass or less, and more preferably 85% by mass or less. In this embodiment, the acrylic copolymer (C) preferably has a total of alkyl methacrylate units (preferably methyl methacrylate units) and alkyl acrylate units (preferably butyl acrylate units) accounting for 90% by mass or more of the total constituent units of the acrylic copolymer (C) excluding the terminal groups, more preferably 95% by mass or more, and even more preferably 97% by mass or more.

[0021] The weight-average molecular weight of the acrylic copolymer (C) is preferably 50,000 or more, more preferably 60,000 or more, even more preferably 70,000 or more, even more preferably 80,000 or more, and even more preferably 90,000 or more. Setting it above the lower limit tends to further improve the effect of maintaining the mechanical strength of the polycarbonate resin composition. The weight-average molecular weight of the acrylic copolymer (C) is also preferably 200,000 or less, more preferably 180,000 or less, even more preferably 160,000 or less, even more preferably 140,000 or less, and even more preferably 120,000 or less. Setting it below the upper limit tends to further improve the compatibility between the polycarbonate resin (A) and the methacrylic copolymer (B) and the effect of maintaining the transparency of the polycarbonate resin composition. The weight-average molecular weight is a polystyrene-equivalent value measured by GPC (gel permeation chromatography).

[0022] The content of the acrylic copolymer (C) in the resin composition of this embodiment is preferably 1 part by mass or more, more preferably 2 parts by mass or more, even more preferably 2.5 parts by mass or more, even more preferably 3 parts by mass or more, and even more preferably 3.5 parts by mass or more, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). Setting the content above the lower limit tends to further improve the impact resistance of the resin composition. Furthermore, the upper limit of the content of the acrylic copolymer (C) is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 7 parts by mass or less, even more preferably 6 parts by mass or less, and even more preferably 5 parts by mass or less, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). Setting the content below the upper limit tends to further improve the maintenance effect of the mechanical strength, heat resistance, and low water absorption of the resin composition. The resin composition of this embodiment may contain only one type of acrylic copolymer (C), or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0023] <UV absorber (D)> The resin composition of this embodiment contains an ultraviolet absorber (D) in a ratio of 0.1 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). By including the ultraviolet absorber (D), a molded product with excellent weather resistance can be obtained. Examples of UV absorbers (D) include benzotriazole-based UV absorbers, benzophenone-based UV absorbers, benzoate-based UV absorbers, hindered amine-based UV absorbers, and triazine-based UV absorbers, with a preference for containing a benzotriazole-based UV absorber. Benzotriazole-based UV absorbers include 2-(2-hydroxy-5-t-octylphenyl)-2H-benzotriazole, 2-(3-t-butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole, 2-[5-chloro(2H)-benzotriazole-2-yl]-4-methyl-6-(t-butyl)phenol, 2,4-di-tert-butyl-6-(5-chlorobenzotriazole-2-yl)phenol, (2-[5-chloro(2H)-benzotriazole-2-yl]-4,6-di(tert-pentyl)phenol), and 3-[3-tert-butyl-5-(5 [-chloro-2H-benzotriazol-2-yl)-4-hydroxyphenyl]octylpropionate, 2-(3-t-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methylphenol, 2-(2H-benzotriazol-2-yl)-p-cresol, 2-[(2H)-benzotriazol-2-yl]-4,6-bis-(1-methyl-1-phenylethyl)phenol, 2,2'-methylenebis[6-(benzotriazol-2-yl)-4-t-octylphenol], etc. are preferred.

[0024] In this embodiment, an ultraviolet absorber represented by the following formula (UV) is preferred. Formula (UV) [ka] (In formula (UV), R 1 R is an alkyl group having 4 to 20 carbon atoms. 2 (This is a hydrogen atom or an organic group.)

[0025] R 1 R may be a linear, branched, or cyclic alkyl group, but a branched alkyl group is preferred. 1 The number of carbon atoms constituting the compound is preferably 5 or more, more preferably 6 or more, even more preferably 7 or more, and preferably 15 or less, and more preferably 10 or less. 1 It is preferable that it is a t-octyl group. R 2 is a hydrogen atom or an organic group, more preferably an organic group containing a hydrogen atom or a benzotriazole ring, and even more preferably an organic group containing a benzotriazole ring. The organic group containing a benzotriazole ring is more preferably an organic group containing an octylphenylbenzotriazole ring, and even more preferably a group containing a structure represented by the following formula (UV-1). Formula (UV-1) [ka] (In formula (UV-1), R 1 is an alkyl group having 4 to 20 carbon atoms. L is a single or divalent linking group, and * indicates the bond position with formula (UV). In formula (UV-1), R 1 R in equation (UV) 1 This is synonymous with the same, and the preferred range is also the same. L is preferably a single bond or 1 to 10 alkylene groups, and more preferably a single bond or a methylene group.

[0026] In addition to the above, the ultraviolet absorber (D) used in this embodiment may be one of those described in paragraph 0051 of Japanese Patent Application Publication No. 2021-041614 and paragraph 0053 of Japanese Patent Application Publication No. 2020-158596, and the contents of these are incorporated herein.

[0027] In the resin composition of this embodiment, the content of the ultraviolet absorber (D) is preferably 0.1 parts by mass or more, and more preferably 0.2 parts by mass or more, per 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). Setting it above the lower limit tends to further improve the weather resistance of the resulting molded product. Furthermore, the content of the ultraviolet absorber (D) is preferably 1.0 part by mass or less, more preferably 0.8 parts by mass or less, more preferably 0.6 parts by mass or less, even more preferably 0.5 parts by mass or less, and even more preferably 0.4 parts by mass or less, per 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). Setting it below the upper limit tends to further improve the weather resistance of the resulting molded product without reducing the initial hue, mechanical properties, and heat resistance. In particular, setting it to 0.2 parts by mass or more per 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B) tends to significantly improve the effect of maintaining moisture and heat resistance. The resin composition of this embodiment may contain only one type of ultraviolet absorber (D), or it may contain two or more types. When it contains two or more types, it is preferable that the total amount is within the above range.

[0028] <Hindered amine-based light stabilizer (E)> The resin composition of this embodiment contains a hindered amine-based light stabilizer (E) in a ratio of 0.1 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). By using the hindered amine-based light stabilizer (E), it is possible to provide molded products with excellent weather resistance.

[0029] The hindered amine-based light stabilizer (E) used in this embodiment may be a low-molecular-weight compound or a high-molecular-weight compound, but a high-molecular-weight compound is preferred. The number-average molecular weight of the hindered amine-based light stabilizer (E) used in this embodiment is preferably 1000 or more, more preferably 1500 or more, even more preferably 2000 or more, and even more preferably 2500 or more. By setting it above the lower limit, the concentration of the reaction site tends to be relatively lower compared to the case of a low-molecular-weight compound, and the probability of attacking the carbonate bonds of the polycarbonate resin can be reduced. As a result, retention stability, impact resistance, humidity and heat resistance, etc., can be improved. The number-average molecular weight of the hindered amine-based light stabilizer (E) used in this embodiment is also preferably 10000 or less, and more preferably 5000 or less. By setting it below the upper limit, compatibility with the resin component tends to be further improved. The number-average molecular weight is the polystyrene equivalent value measured by GPC (gel permeation chromatography).

[0030] The hindered amine-based light stabilizer used in this embodiment may be any of the NH type, N-Me type, or N-OR type shown below. [ka] Here, R is an organic group. x is an alkyl group having 1 to 5 carbon atoms, preferably a methyl group, and m is an integer from 0 to 4, preferably 0 or 1. Also, * indicates the bond position with other sites.

[0031] In this embodiment, the hindered amine light stabilizer (E) is more preferably an NR-type hindered amine light stabilizer represented by formula (HALS-1). By using the NR type, the alkalinity becomes closer to neutral compared to the NH type, making it less likely for the carbonate bonds of the polycarbonate resin to be hydrolyzed. As a result, the degradation of the polycarbonate resin can be effectively suppressed and various performance characteristics can be improved. Formula (HALS-1) [ka] (In formula (HALS-1), R is an organic group. x (where m is an alkyl group with 1 to 5 carbon atoms, m is an integer from 0 to 4, and * indicates the bonding position with other sites.)

[0032] The hindered amine light stabilizer (E) used in this embodiment is more preferably an NR-type hindered amine light stabilizer represented by formula (HALS-2). Formula (HALS-2) [ka] (In formula (HALS-2), L represents an organic group, T represents a terminal group, and n is a number between 10 and 200.) L is an alkylene group having 1 to 10 carbon atoms, or a group consisting of one or more alkylene groups having 1 to 10 carbon atoms and one or more -O- and / or -C(=O)- groups. T is a terminal group and is preferably an *-O- hydrocarbon group, where * is the bonding site with L. The hydrocarbon group is preferably an alkyl group having 1 to 10 carbon atoms, or a phenyl group.

[0033] The content of the hindered amine-based light stabilizer (E) in the resin composition of this embodiment is preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, and may be 0.4 parts by mass or more, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). Setting it above the lower limit tends to further improve the weather resistance of the resin composition. Furthermore, the content of the hindered amine-based light stabilizer (E) in the resin composition of this embodiment is preferably 1.0 part by mass or less, more preferably 0.9 parts by mass or less, more preferably 0.8 parts by mass or less, even more preferably 0.7 parts by mass or less, and depending on the application, it is even more preferably 0.6 parts by mass or less, and even more preferably 0.5 parts by mass or less. Setting it below the upper limit tends to further improve the effect of maintaining the moisture heat resistance and heat retention stability of the resin composition. The resin composition of this embodiment may contain only one type of hindered amine-based light stabilizer (E), or it may contain two or more types. When two or more types are included, it is preferable that the total amount is within the above range.

[0034] In the resin composition of this embodiment, the mass ratio of the ultraviolet absorber (D) to the hindered amine light stabilizer (E), (D) / (E), is preferably 3 or less, more preferably 2.5 or less, even more preferably 2.3 or less, even more preferably 2 or less, even more preferably 1.5 or less, even more preferably 1.2 or less, even more preferably 1 or less, even more preferably 0.8 or less, and even more preferably 0.6 or less. Setting it below the upper limit tends to further improve the balance between the amount of photodegraded products (radicals) generated from the ultraviolet absorber (D) during ultraviolet irradiation and the amount of radicals absorbed by the hindered amine light stabilizer (E). The lower limit of (D) / (E) is preferably 0.1 or more, more preferably 0.2 or more, even more preferably 0.3 or more, and even more preferably 0.4 or more. Setting it above the lower limit tends to further improve the effect of maintaining the radical absorption by the hindered amine light stabilizer (E). In this embodiment, it is particularly preferable that the content of the ultraviolet absorber (D) is 0.2 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B), and that the mass ratio of the ultraviolet absorber (D) to the hindered amine-based light stabilizer (E), (D) / (E), is 1.2 or less. Furthermore, it is even more preferable that the hindered amine-based light stabilizer (E) has a number average molecular weight of 1000 or more and includes an NR-type hindered amine-based light stabilizer represented by formula (HALS-1). With such a configuration, the effects of the present invention tend to be exhibited more effectively.

[0035] <Other ingredients> The resin composition of this embodiment may contain other components as needed, as long as they do not significantly impair the desired physical properties. Examples of other components include various resin additives. Examples of resin additives include stabilizers (heat stabilizers, antioxidants, etc.), mold release agents, colorants (dyes, pigments), antistatic agents, flame retardants, flame retardant enhancers, antifogging agents, antiblocking agents, flow improvers, plasticizers, dispersants, and antibacterial agents. The resin additive may contain only one type, or two or more types in any combination and ratio. For antistatic agents, refer to paragraphs 0063 to 0067 of Japanese Patent Publication No. 2016-216534, and these contents are incorporated herein by reference. For flame retardants, refer to paragraphs 0068 to 0075 of Japanese Patent Publication No. 2016-216534, and these contents are incorporated herein by reference.

[0036] Examples of stabilizers include heat stabilizers and antioxidants. Other examples of stabilizers include phenolic, amine, phosphorus, and thioether-based stabilizers. In this embodiment, a phosphorus-based heat stabilizer (G) and / or a phenolic antioxidant (H) are preferred.

[0037] <<Phosphorus-based heat stabilizer (G)>> The resin composition of this embodiment preferably contains a phosphorus-based heat stabilizer (G). Any known phosphorus-based heat stabilizer (G) can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphate; acidic pyrophosphate metal salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and calcium acidic pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; and organic phosphate compounds, organic phosphite compounds, and organic phosphonite compounds, with organic phosphite compounds being particularly preferred.

[0038] Examples of organic phosphite compounds include triphenyl phosphite, tris(mononylphenyl) phosphite, tris(mononyl / dinonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, and 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite. Examples of such organic phosphite compounds include, for example, "ADEKA Stab (registered trademark; hereinafter the same) 1178," "ADEKA Stab 2112," and "ADEKA Stab HP-10" manufactured by ADEKA Corporation, "JP-351," "JP-360," and "JP-3CP" manufactured by Johoku Chemical Industry Co., Ltd., and "Irgaphos (registered trademark; hereinafter the same) 168" manufactured by BASF.

[0039] The content of the phosphorus-based heat stabilizer (G) in the resin composition of this embodiment is usually 0.001 parts by mass or more, preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and usually 1 part by mass or less, preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). By setting the content of the phosphorus-based heat stabilizer (G) within the above range, the effect of adding the heat stabilizer is more effectively exhibited. The resin composition of this embodiment may contain only one type of phosphorus-based heat stabilizer (G), or it may contain two or more types. When two or more types are included, it is preferable that the total amount is within the above range.

[0040] <<Phenol-based antioxidant (H)>> The resin composition of this embodiment preferably contains a phenolic antioxidant (H), and a hindered phenolic antioxidant is preferably used. Specific examples of hindered phenol antioxidants include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide], 2,4-dimethyl-6-(1-methylpentadecyl)phenol, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphate, 4,6-bis(octyl) Examples include ruthiomethyl)-o-cresol, ethylenebis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-ylamino)phenol, and 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate.

[0041] Among these, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate are preferred. Specific examples of such hindered phenol antioxidants include, for example, BASF's "Irganox (registered trademark; hereinafter the same) 1010" and "Irganox 1076," and ADEKA's "ADEKA Stab AO-50" and "ADEKA Stab AO-60."

[0042] The content of the phenolic antioxidant (H) (preferably a hindered phenolic antioxidant) in the resin composition of this embodiment is usually 0.001 parts by mass or more, preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and usually 1 part by mass or less, preferably 0.5 parts by mass or less, more preferably 0.3 parts by mass or less, per 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). By setting the content of the phenolic antioxidant (H) within the above range, the effect of adding the phenolic antioxidant (H) is more effectively exhibited. The resin composition of this embodiment may contain only one type of phenolic antioxidant (H), or it may contain two or more types. When two or more types are included, it is preferable that the total amount is within the above range.

[0043] Furthermore, in the resin composition of this embodiment, the mass ratio of phosphorus-based heat stabilizer (G) to phenol-based antioxidant (H), i.e., phosphorus-based heat stabilizer (G) / phenol-based antioxidant (H), is preferably 0.1 to 1.0, and more preferably 0.3 to 0.8. By setting the ratio within this range, the photodegradation of the resulting molded product can be more effectively suppressed. In particular, the phenol-based antioxidant (H) can neutralize peroxides derived from the phosphorus-based heat stabilizer (G).

[0044] In this embodiment, the mass ratio of the ultraviolet absorber (D) to the phenolic antioxidant (H), i.e., ultraviolet absorber (D) / phenolic antioxidant (H), is preferably 3 to 25, and more preferably 3 to 10. By setting the ratio within this range, the photodegradation of the resulting molded product can be suppressed more effectively. The phenolic antioxidant (H) assists the function of the hindered amine light stabilizer (E), and by adjusting this mass ratio as described above, its function can be made to exert more effectively.

[0045] <<Release agent (I)>> The resin composition of this embodiment may contain a mold release agent (I). Examples of release agents (I) include aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, polysiloxane-based silicone oils, ketone waxes, and light amides. Aliphatic carboxylic acids, salts of aliphatic carboxylic acids, and esters of aliphatic carboxylic acids and alcohols are preferred, and salts of aliphatic carboxylic acids are more preferred. Details of the release agent (I) can be found in paragraphs 0055 to 0061 of Japanese Patent Publication No. 2018-095706, and these contents are incorporated herein by reference. If the resin composition of this embodiment contains a release agent (I), its content is preferably 0.05 to 3% by mass, more preferably 0.1 to 0.8% by mass, and even more preferably 0.1 to 0.6% by mass, in the resin composition. The resin composition of this embodiment may contain only one type of release agent (I), or it may contain two or more types. When two or more types are included, it is preferable that the total amount is within the above range.

[0046] <<Coloring agent (J)>> The resin composition of this embodiment may also contain a colorant (J) (dye and / or pigment). Examples of colorants (J) that may be used in this embodiment include inorganic pigments such as titanium dioxide and carbon black, organic dyes, and organic pigments.

[0047] Examples of inorganic pigments include sulfide pigments such as carbon black, cadmium red, and cadmium yellow; silicate pigments such as ultramarine; oxide pigments such as zinc oxide, iron oxide, chromium oxide, iron black, titanium yellow, zinc-iron brown, titanium cobalt green, cobalt green, cobalt blue, copper-chromium black, and copper-iron black; chromic acid pigments such as lead yellow and molybdate orange; and ferrocyanate pigments such as Prussian blue. Examples of organic pigments and dyes include phthalocyanine dyes or pigments such as copper phthalocyanine blue and copper phthalocyanine green; azo dyes or pigments such as nickel azo yellow; condensed polycyclic dyes or pigments such as thioindigo, perinone, perylene, quinacridone, dioxazine, isoindolinone, and quinophthalone; and anthraquinone, heterocyclic, and methyl dyes or pigments.

[0048] In this embodiment, the content of the colorant (J) in the resin composition is preferably 0.01 parts by mass or more, and more preferably 0.1 parts by mass or more, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). Furthermore, the content of the colorant (J) is preferably 5.0 parts by mass or less, more preferably 3.0 parts by mass or less, and even more preferably 2.0 parts by mass or less, based on 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). The aforementioned resin composition may contain only one colorant (J), or it may contain two or more colorants (J). If it contains two or more colorants, it is preferable that the total amount is within the above range.

[0049] <Physical properties of resin compositions> The melt volume rate (MVR) of the resin composition of this embodiment at 260°C and a load of 5 kg is 20 cm³. 3 It is preferable that it be 10 minutes or longer, and also 40 cm 3 Preferably 10 minutes or less, 35cm 3 It is more preferable that the time is 10 minutes or less. The MVR is measured according to the example described below.

[0050] The resin composition of this embodiment is preferably excellent in terms of retention stability. Specifically, the melt volume rate (MVR) of the resin composition of this embodiment at 260°C and a load of 5 kg after being left standing for 20 minutes is preferably less than 12%, preferably less than 10%, more preferably 7% or less, and even more preferably less than 5% compared to the case without standing. The lower limit of the above value is ideally 0%, but 0.1% or more is practical. Such standing stability can be achieved, for example, by using a hindered amine-based light stabilizer with a large molecular weight (for example, a number average molecular weight of 1000 or more).

[0051] The resin composition of this embodiment is preferably excellent in weather resistance. For example, if the resin composition of this embodiment is molded into a 2 mm thick test piece and the integrated irradiation dose in the wavelength range of 300-400 nm is 150 MJ / m², 2 It is preferable that the color difference ΔE before and after light irradiation is less than 10, more preferably 8.0 or less, and even more preferably 5.0 or less. Such high weather resistance is achieved by incorporating hindered amine light stabilizers, particularly by using hindered amine light stabilizers with a large molecular weight (e.g., a number-average molecular weight of 1000 or more), and even more specifically by using NR-type hindered amine light stabilizers with a large molecular weight (e.g., a number-average molecular weight of 1000 or more).

[0052] The resin composition of this embodiment preferably has excellent resistance to moisture and heat. In particular, in this embodiment, hydrolysis of the polycarbonate resin is effectively suppressed, and high impact resistance can be maintained even after moisture and heat resistance testing. In particular, when the resin composition of this embodiment is molded into an ISO standard multipurpose test piece (ISO 3167 type A) and left to stand for 125 hours in a humid heat environment of 80°C and 95% relative humidity, the retention rate of the notched Charpy strength according to ISO 179 ((Charpy impact strength after being placed in a humid heat environment / initial Charpy impact strength) × 100) is preferably 40% or more, more preferably 60% or more, and even more preferably 70% or more. The upper limit of the retention rate is ideally 100%, but 99% or less is practical. Such high impact resistance after humid heat treatment is achieved by using a hindered amine light stabilizer (E) with a number average molecular weight of 1000 or more, or more specifically, an NR-type hindered amine light stabilizer with a number average molecular weight of 1000 or more and represented by the above formula (HALS-1).

[0053] <Method for producing resin compositions> There are no limitations on the manufacturing method of the resin composition of this embodiment, and a wide range of known methods for manufacturing resin compositions can be used. For example, a method may be used in which polycarbonate resin (A), methacrylic copolymer (B), acrylic copolymer (C), ultraviolet absorber (D), hindered amine light stabilizer (E), and other components that may be added as needed are pre-mixed using various mixers such as a tumbler or Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, braver, single-screw extruder, twin-screw extruder, or kneader. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C. Furthermore, the colorant (J) may be incorporated as a masterbatch. When the colorant (J) is made into a masterbatch, styrene resin is preferred. In the masterbatch of the colorant (J), the concentration of the colorant (J) is preferably 10 to 50% by mass.

[0054] <Molded products> The molded articles of this embodiment are formed from the resin composition or pellets of this embodiment. The above-mentioned resin composition (for example, pellets) is molded into molded articles by various molding methods. That is, the molded articles of this embodiment are molded from the resin composition of this embodiment. There are no particular restrictions on the shape of the molded articles, and they can be appropriately selected according to the use and purpose of the molded articles. Examples include film-shaped, rod-shaped, cylindrical, annular, circular, elliptical, polygonal, irregularly shaped, hollow, frame-shaped, box-shaped, panel-shaped, button-shaped, etc.

[0055] The method for molding the molded product is not particularly limited, and conventionally known molding methods can be employed. Examples include injection molding, injection compression molding, extrusion molding, shape extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating) molding, rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding. In particular, the resin composition of this embodiment is suitable for molded products obtained by injection molding, injection compression molding, and extrusion molding. However, it goes without saying that the resin composition of this embodiment is not limited to molded products obtained by these methods.

[0056] The molded article of this embodiment, which includes polycarbonate resin and styrene resin, can be widely used in applications requiring high weather resistance, moisture resistance, and retention stability. Specifically, it is preferably used in electrical and electronic equipment / components, office automation equipment / components, information terminal equipment / components, machine parts, home appliances, vehicle parts (automobile interior and exterior), building materials, various containers, leisure goods and miscellaneous goods, lighting equipment, etc. In particular, it is preferably used in exterior materials for automobiles, such as front air dams, pillars, roof rails, spoilers, rear gate garnishes, and door mirror housings. [Examples]

[0057] The present invention will be described in more detail below with reference to examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate, as long as they do not depart from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. If the measuring instruments used in the examples are difficult to obtain due to discontinuation or other reasons, measurements can be taken using other instruments with equivalent performance.

[0058] 1.Raw materials The following ingredients were used. [Table 1]

[0059] The polycarbonate resin MVR was placed inside the sample pellet to be measured in the melt indexer cylinder, and the value was measured after heating for 4 minutes at 260°C under a load of 5 kg, in accordance with ISO-1133 standards.

[0060] [Table 2]

[0061] (E1): Uvinul 5050H The structure is shown below. In the following, p 1 The range is 6-9. [ka] (E2): Tinuvin PA144. The structure is shown below. [ka] (E3): Tinuvin 622SF. The structure is shown below. [ka]

[0062] 2. Examples 1-13, Comparative Examples 1-4 <Compound> The components described in Tables 1 and 2 were mixed in the amounts (all in parts by mass) described in Tables 4 to 7 for 20 minutes using a tumbler mixer, and then supplied to a twin-screw extruder TEX30α manufactured by Japan Steel Works, Ltd. equipped with 1 vent. Kneading was carried out under the conditions of a screw rotation speed of 250 rpm, a discharge rate of 40 kg / hour, and a barrel temperature of 260°C. The molten resin composition extruded in a strand shape was rapidly cooled in a water tank and pelletized using a pelletizer to obtain pellets of the resin composition.

[0063] <MVR(1) and Retained MVR(2)> Into the cylinder of the melt indexer, put inside the pellets of the sample to be measured, and in accordance with the ISO-1133 standard, at 260°C and a load of 5 kg, the MVR value (MVR(1)) after heating for 4 minutes and the MVR value of the same sample after heating for 20 minutes (retained MVR(2)) were measured. Also, the increase value of the retained MVR(2) with respect to the above MVR(1) (retained MVR(2) - MVR(1)) was calculated. Furthermore, the increase rate (%) from the above MVR(1) was calculated in accordance with the following formula. Increase rate (%) = [(retained MVR(2) - MVR(1)) / MVR(1)] × 100

[0064] <Impact resistance> After drying the pellets obtained above at 120°C for 5 hours, using an injection molding machine NEX140III manufactured by Nissei Plastic Industrial Co., Ltd., injection molding was carried out at a cylinder temperature of 260°C and a mold temperature of 80°C to mold an ISO standard multipurpose test piece (ISO 3167 typeA). The ISO standard multipurpose test piece (ISO 3167 typeA) obtained by the above method was notch processed using a notching machine (Toyoseiki Co., Ltd. "Notching Tool A-4 type") with a single-tooth V cutter (45°, R = 0.25 mm), a notch rotation speed of 300 rpm, and a notch cutting number of 3 times, and at the same time, the central part was cut out by 80 mm using a slicer. The Charpy impact strength of the obtained notched Charpy test piece was measured in accordance with ISO 179 (unit: kJ / m 2 ) The measurement was carried out using a Charpy impact tester DG-CB manufactured by Toyoseiki at a measurement temperature of 23°C.

[0065] <Color development (initial hue / blackness L*)> The pellets obtained above were dried at 120°C for 5 hours, and then injection molded using a Shibaura Machine Co., Ltd. EC50SXII injection molding machine at a cylinder temperature of 260°C, with stepped molds of 1mm / 2mm / 3mm thickness, and a mold temperature of 80°C to form a three-tiered plate (60mm x 100mm) with thicknesses of 1mm / 2mm / 3mm. A spectrophotometer SE6000 manufactured by Nippon Denshoku Industries Co., Ltd. was used, set to the reflection method, C light source, and 2° field of view, and measurements were taken at the center of the 2 mm thick plate obtained above.

[0066] <Weather resistance> The pellets obtained above were dried at 120°C for 5 hours, and then injection molded using a Shibaura Machine Co., Ltd. EC50SXII injection molding machine at a cylinder temperature of 260°C, with stepped molds of 1mm / 2mm / 3mm thickness, and a mold temperature of 80°C to form a three-tiered plate (60mm x 100mm) with thicknesses of 1mm / 2mm / 3mm. The three-tiered plates with thicknesses of 1 mm / 2 mm / 3 mm obtained by the method described above were subjected to weathering treatment using a xenon weatherometer under the following weather resistance test conditions, and the hue before and after weathering treatment was measured at the cumulative irradiation dose in the wavelength range of 300-400 nm, and the color difference ΔE was determined. * They were compared. <<Weather Resistance Test Conditions>> [Table 3]

[0067] <Heat and moisture resistance> The notched Charpy impact specimens described above were subjected to moist heat treatment for 125, 250, 375, and 500 hours in an environment of 80°C and 95% relative humidity, and the Charpy impact strength was measured in the same manner as above (unit: kJ / m). 2 The Charpy impact strength test was conducted in accordance with ISO 179. The measurements were performed using a Toyo Seiki Charpy impact tester DG-CB at a measurement temperature of 23°C. Moisture heat resistance was evaluated by comparing the Charpy impact strength before and after moist heat treatment. Specifically, the retention rate of the Charpy impact strength after moist heat treatment relative to the initial Charpy impact strength was calculated according to the following formula. Retention rate (%) = (Charpy impact strength after moist heat treatment / Initial Charpy impact strength) × 100

[0068] [Table 4]

[0069] [Table 5]

[0070] [Table 6]

[0071] [Table 7]

[0072] As is clear from the above results, the resin composition of this embodiment yielded a resin composition capable of providing molded articles with excellent impact resistance and weather resistance. In particular, a resin composition with excellent stability during stagnation molding was obtained. Furthermore, by using a polymer compound as the hindered amine light stabilizer (E) (Examples 1-12), molded articles with even better weather resistance were obtained. Furthermore, by using an NR-type hindered amine light stabilizer (E) (Examples 7-12), molded articles with even more remarkably excellent weather resistance were obtained. In contrast, when the methacrylic copolymer (B) does not contain styrene units and alkyl methacrylate units, it exhibits inferior impact resistance (Comparative Examples 1 and 3) and poor weather resistance (ΔE, particularly 150 MJ / m²). 2 ) was inferior (Comparative Examples 2-4).

Claims

1. For a total of 100 parts by mass of polycarbonate resin (A) and methacrylic copolymer (B), 1 to 10 parts by mass of acrylic copolymer (C), UV absorber (D) 0.1 to 1.0 parts by mass, 0.1 to 1.0 parts by mass of hindered amine-based light stabilizer (E) and Includes, The methacrylic copolymer (B) comprises styrene units and alkyl methacrylate units, The acrylic copolymer (C) contains 10 to 50% by mass of methyl methacrylate units and 50 to 90% by mass of butyl acrylate units. Resin composition.

2. The resin composition according to claim 1, wherein the number average molecular weight of the hindered amine-based light stabilizer (E) is 1000 or more.

3. The resin composition according to claim 1, wherein the hindered amine light stabilizer (E) comprises an NR-type hindered amine light stabilizer represented by formula (HALS-1). Formula (HALS-1) 【Chemistry 1】 (In formula (HALS-1), R is an organic group. ｘ (where m is an alkyl group having 1 to 5 carbon atoms, m is an integer from 0 to 4, and * indicates the bonding position with other sites.)

4. The resin composition according to claim 1, wherein the hindered amine-based light stabilizer (E) has a number average molecular weight of 1000 or more and includes an NR-type hindered amine-based light stabilizer represented by formula (HALS-1). Formula (HALS-1) 【Chemistry 2】 (In formula (HALS-1), R is an organic group. ｘ (where m is an alkyl group having 1 to 5 carbon atoms, m is an integer from 0 to 4, and * indicates the bonding position with other sites.)

5. The resin composition according to claim 4, wherein the amount of the ultraviolet absorber (D) is 0.2 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B).

6. The resin composition according to claim 4, wherein the mass ratio of the ultraviolet absorber (D) to the hindered amine-based light stabilizer (E), (D) / (E), is 1.2 or less.

7. The amount of the ultraviolet absorber (D) is 0.2 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). The resin composition according to claim 4, wherein the mass ratio of the ultraviolet absorber (D) to the hindered amine-based light stabilizer (E), (D) / (E), is 1.2 or less.

8. The resin composition according to claim 1, wherein the weight-average molecular weight of the acrylic copolymer (C) is 50,000 to 200,000.

9. The resin composition according to claim 1, wherein the methacrylic copolymer (B) comprises 60 to 90% by mass of styrene units and 10 to 40% by mass of methyl methacrylate units.

10. The resin composition according to claim 1, wherein the proportion of methacrylic copolymer (B) is 10 to 60 parts by mass with respect to a total of 100 parts by mass of the polycarbonate resin (A) and methacrylic copolymer (B).

11. The aforementioned hindered amine-based light stabilizer (E) has a number average molecular weight of 1000 or more and includes an NR-type hindered amine-based light stabilizer represented by formula (HALS-1). The amount of the ultraviolet absorber (D) is 0.2 to 1.0 parts by mass per 100 parts by mass of the total of the polycarbonate resin (A) and the methacrylic copolymer (B). The mass ratio of the ultraviolet absorber (D) to the hindered amine-based light stabilizer (E), (D) / (E), is 1.2 or less. The weight-average molecular weight of the acrylic copolymer (C) is 50,000 to 200,000. The methacrylic copolymer (B) contains 60 to 90% by mass of styrene units and 10 to 40% by mass of methyl methacrylate units. The resin composition according to claim 1, wherein the proportion of methacrylic copolymer (B) is 10 to 60 parts by mass with respect to a total of 100 parts by mass of the polycarbonate resin (A) and methacrylic copolymer (B). Formula (HALS-1) 【Transformation 3】 (In formula (HALS-1), R is an organic group. ｘ (where m is an alkyl group having 1 to 5 carbon atoms, m is an integer from 0 to 4, and * indicates the bonding position with other sites.)

12. Pellets of the resin composition according to any one of claims 1 to 11.

13. A molded article formed from the resin composition according to any one of claims 1 to 11.

14. A molded article formed from the pellets described in claim 12.

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