Resin compositions, pellets, and molded articles

Abstract

To provide a resin composition and a pellet which are capable of providing a molded article excellent in water repellency, color development, and weather resistance, and to provide a molded article.SOLUTION: The resin composition contains 1-10 pts.mass of an acrylic copolymer (C) and 0.05-3 pts.mass of a linear or branched polyorganosiloxane (D) having an aromatic group and / or an alkoxy group based on 100 pts.mass of the total of a polycarbonate resin (A) and a methacrylic copolymer (B). The methacrylic copolymer (B) contains a styrene unit and an alkyl methacrylate unit. 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 acrylic resin, styrene resin, etc. 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] Acrylic resins and styrene-based resins are often added to polycarbonate resins to improve their various properties. However, depending on the type of resin added, the hue (color development) and weather resistance may be inferior. Furthermore, depending on the application, water repellency may be required for polycarbonate resin compositions. 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 water repellency, color development, and weather resistance. [Means for solving the problem]

[0006] Based on the above problems, the inventors conducted investigations and found that the above problems were solved by using a predetermined methacrylic copolymer and acrylic copolymer, and a predetermined polyorganosiloxane. 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), and 0.05 to 3 parts by mass of a linear or branched polyorganosiloxane (D) having aromatic groups and / or alkoxy groups, 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> Furthermore, per 100 parts by mass of the total of polycarbonate resin (A) and methacrylic copolymer (B), the mixture contains 0.1 to 1 part by mass of an ultraviolet absorber (E) and 0.1 to 1 part by mass of a hindered amine-based light stabilizer (F). <1> The resin composition described above. <3> The number average molecular weight of the aforementioned hindered amine-based light stabilizer (F) is 1000 or more. <2> The resin composition described above. <4> The aforementioned hindered amine light stabilizer (F) includes an NR-type hindered amine light stabilizer represented by formula (HALS-1). <2> or <3> The resin composition described above. Formula (HALS-1) [Chemical formula] (In formula (HALS-1), R is an organic group. R x is an alkyl group having 1 to 5 carbon atoms, m is an integer of 0 to 4, and * is the bonding position with other sites.) <5>The hindered amine light stabilizer (F) has a number average molecular weight of 1000 or more and contains an NR type hindered amine light stabilizer represented by formula (HALS-1), and the resin composition according to <2>. Formula (HALS-1) [Chemical formula] (In formula (HALS-1), R is an organic group. R x is an alkyl group having 1 to 5 carbon atoms, m is an integer of 0 to 4, and * is the bonding position with other sites.) <6>The weight average molecular weight of the acrylic copolymer (C) is 50,000 to 200,000, and the resin composition according to any one of <1> to <5>. <7>The acrylic copolymer (C) contains 10 to 50% by mass of methyl methacrylate units and 50 to 90% by mass of butyl acrylate units, and the resin composition according to any one of <1> to <6>. <8>The methacrylic copolymer (B) contains 60 to 90% by mass of styrene units and 10 to 40% by mass of methyl methacrylate units, and the resin composition according to any one of <1> to <7>. <9>With respect to a total of 100 parts by mass of the polycarbonate resin (A) and the methacrylic copolymer (B), the proportion of the methacrylic copolymer (B) is 10 to 60 parts by mass, and the resin composition according to any one of <1> to <8>. <10>The hindered amine light stabilizer (F) has a number average molecular weight of 1000 or more and contains an NR type hindered amine light stabilizer represented by the formula (HALS-1). The weight average molecular weight of the acrylic copolymer (C) is 50,000 to 200,000. The acrylic copolymer (C) contains 10 to 50% by mass of methyl methacrylate units and 50 to 90% by mass of butyl acrylate units. The methacrylic copolymer (B) contains 60 to 90% by mass of styrene units and 10 to 40% by mass of methyl methacrylate units. The proportion of the methacrylic copolymer (B) is 10 to 60 parts by mass with respect to 100 parts by mass in total of the polycarbonate resin (A) and the methacrylic copolymer (B). The resin composition according to <2>. Formula (HALS-1)

Chemical formula

Advantages of the Invention

[0007] According to the present invention, a resin composition capable of providing a molded article excellent in water repellency, color development property, and weather resistance, as well as pellets and molded articles, has been provided.

Modes for Carrying Out the Invention

[0008] Hereinafter, modes for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an exemplification for explaining the present invention, and the present invention is not limited only to the present embodiment. In this specification, "~" is used in the meaning of including the numerical values described before and after it as lower limit values and upper limit values. 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), and 0.05 to 3 parts by mass of a linear or branched polyorganosiloxane (D) having aromatic groups and / or alkoxy groups, 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. With this configuration, a resin composition is obtained that can provide molded articles with excellent water repellency, color development, and weather resistance. Furthermore, a resin composition with excellent heat and humidity resistance is also obtained. Weather resistance is achieved by using methacrylic copolymer (B) and acrylic copolymer (C), in addition to using a specified polyorganosiloxane (D). The reason why weather resistance improved with the use of the specified polyorganosiloxane (D) is presumed to be because one of the factors that worsens weather resistance is water resistance. In other words, it is presumed that by using the specified polyorganosiloxane (D), it was possible to improve water resistance, which affects weather resistance. In particular, it is presumed that when the specified polyorganosiloxane (D) has aromatic groups, it has excellent compatibility with polycarbonate resin (A), and therefore excellent color development can be effectively achieved. Furthermore, it is presumed that when the specified polyorganosiloxane (D) has alkoxy groups, the alkoxy groups have high polarity, so the affinity with polycarbonate resin (A) can be increased, and excellent color development can be effectively achieved. In contrast, it was presumed that when the polyorganosiloxane lacked aromatic and alkoxy groups, for example, only alkyl groups, it could not achieve affinity or compatibility with the polycarbonate resin (A), and therefore excellent color development could not be achieved. The color development is primarily achieved by incorporating linear or branched polyorganosiloxanes (D) having aromatic and / or alkoxy groups (hereinafter sometimes simply referred to as "polyorganosiloxanes (D)"). Water repellency is achieved by incorporating a predetermined amount of polyorganosiloxane (D). The details of this embodiment will be described below.

[0010] <Polycarbonate resin (A)> The resin composition of this embodiment includes a 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 determined by using methylene chloride as a solvent and an Ubbelohde viscometer to obtain the intrinsic viscosity [η] (unit: dL / g) at a temperature of 25°C, and using the Schnell viscosity formula, that is, η = 1.23×10 -4 ×Mv 0.83 , and means the value calculated therefrom. 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 250°C and a load of 2.16 kg is preferably 10 cm 3 / 10 min or more, and preferably 70 cm 3 / 10 min or less, more preferably 65 cm 3 / 10 min or less, still more preferably 50 cm 3 / 10 min or less, even more preferably 40 cm 3 / 10 min or less, still even more preferably 30 cm 3 / 10 min or less, yet even more preferably 20 cm 3 / 10 min or less is even more preferably. The MVR is measured by putting the pellets of the sample to be measured into the cylinder of a melt indexer and measuring the value after heating for 4 minutes under the conditions of 260°C and a load of 5 kg in accordance with the ISO-1133 standard. When using two or more polycarbonate resins, it is the MVR of the mixture.

[0013] In addition to the above, the details of the polycarbonate resin can be referred to the descriptions in paragraphs

[0013] to

[0041] of JP-A-No. 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 contains an acrylic copolymer (C) comprising alkyl methacrylate units and alkyl acrylate units. The inclusion of acrylic copolymer (C) tends to further improve impact resistance.

[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 1 part by mass or more, preferably 2 parts by mass or more, 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. The upper limit of the content of the acrylic copolymer (C) is 10 parts by mass or less, preferably 8 parts by mass or less, 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] <Linear or branched polyorganosiloxanes (D) having aromatic and / or alkoxy groups> The resin composition of this embodiment contains 100 parts by mass of a total of polycarbonate resin (A) and methacrylic copolymer (B), and 0.05 to 3 parts by mass of a linear or branched polyorganosiloxane (D) having aromatic groups and / or alkoxy groups. By including such a polyorganosiloxane (D), water repellency and color development can be improved.

[0024] The polyorganosiloxane (D) used in this embodiment has aromatic groups and / or alkoxy groups. The presence of these groups improves compatibility or affinity with the polycarbonate resin (A), thereby improving both water repellency and color development. The aromatic group of polyorganosiloxane (D) is preferably a phenyl group. Furthermore, the alkoxy group of polyorganosiloxane (D) is preferably an alkoxy group having 1 to 5 carbon atoms, more preferably an alkoxy group having 1 to 3 carbon atoms, and even more preferably a methoxy group.

[0025] The polyorganosiloxane (D) used in this embodiment preferably has a viscosity of 10 mPa·s or more, more preferably 20 mPa·s or more, even more preferably 50 mPa·s or more, even more preferably 80 mPa·s or more, and even more preferably 100 mPa·s or more. Setting it above the lower limit reduces the amount of volatile components, suppresses mold contamination during molding, and tends to more effectively suppress the decrease of water-repellent components on the surface. Furthermore, the viscosity is preferably 10,000 mPa·s or less, more preferably 5,000 mPa·s or less, even more preferably 3,000 mPa·s or less, even more preferably 2,000 mPa·s or less, and even more preferably 1,000 mPa·s or less. Setting it below the upper limit makes it easier for segregation to occur on the surface in the molded article, and as a result, tends to further improve the water repellency of the surface. The viscosity of polyorganosiloxane (D) is measured according to the Ubberohde viscometer in accordance with JIS Z 8803:2011.

[0026] The weight-average molecular weight (Mw) of the polyorganosiloxane (D) used in this embodiment is not particularly limited, but is preferably 500 or more, more preferably 600 or more, even more preferably 700 or more, and particularly preferably 800 or more. It is also preferably 60,000 or less, more preferably 40,000 or less, even more preferably 30,000 or less, even more preferably 20,000 or less, even more preferably 10,000 or less, and may also be 5,000 or less, 2,000 or less, 1,800 or less, 1,700 or less, 1,600 or less, or 1,100 or less. Setting the weight-average molecular weight above the lower limit reduces the amount of volatile components, improves retention and moldability, and more effectively suppresses the reduction of components that affect the water droplet contact angle on the surface, which is preferable. Setting the weight-average molecular weight below the upper limit reduces the viscosity of the polyorganosiloxane (D), making it easier to segregate on the surface in the molded body, which tends to further improve the water droplet contact angle, and is therefore preferable. Furthermore, by keeping the weight-average molecular weight below the above upper limit, the compatibility of the polyorganosiloxane with (A) polycarbonate resin is improved, making it easier to obtain a more transparent resin composition, which is preferable.

[0027] The content of polyorganosiloxane (D) in the resin composition of this embodiment is 0.05 parts by mass or more, preferably 0.08 parts by mass or more, more preferably 0.1 parts by mass or more, even more preferably 0.2 parts by mass or more, even more preferably 0.6 parts by mass or more, and even more preferably 0.8 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 water repellency and weather resistance of the resulting molded article. Furthermore, the upper limit of the polyorganosiloxane (D) content is 3 parts by mass or less, preferably 2.5 parts by mass or less, more preferably 2 parts by mass or less, even more preferably 1.5 parts by mass or less, and even more preferably 1 part 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 color development of the resulting molded article. The resin composition of this embodiment may contain only one type of polyorganosiloxane (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] <Other water repellents> The resin composition of this embodiment may contain water-repellent agents other than the specified polyorganosiloxane (D). Other water-repellent agents include higher aliphatic hydrocarbons, with paraffin wax being preferred. The inclusion of paraffin wax tends to further improve weather resistance in addition to water repellency. Examples of paraffin waxes include substances whose main component is a saturated aliphatic hydrocarbon such as n-paraffin and / or i-paraffin, or low molecular weight polyethylene having hydroxyl groups at its ends and having a waxy appearance. The molecular weight of the paraffin wax, as measured by GPC, is preferably 300 to 1500, more preferably 300 to 1000. The paraffin wax can be easily produced by conventional organic reactions, or a commercially available product can be used.

[0029] If the resin composition of this embodiment contains a water-repellent agent other than the predetermined polyorganosiloxane (D) (preferably paraffin wax), the content thereof is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, even more preferably 0.1 parts by mass or more, even more preferably 0.15 parts by mass or more, and even more preferably 0.2 parts by mass or more, based on 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). Furthermore, the upper limit of the content of the water-repellent agent other than the predetermined polyorganosiloxane (D) (preferably paraffin wax) is preferably 1 part by mass or less, more preferably 0.7 parts by mass or less, even more preferably 0.5 parts by mass or less, and even more preferably 0.3 parts by mass or less, based on 100 parts by mass of the total of the polycarbonate resin (A) and methacrylic copolymer (B). The resin composition of this embodiment may contain only one other water-repellent agent (preferably paraffin wax) in addition to the specified polyorganosiloxane (D), or it may contain two or more. When two or more are included, it is preferable that the total amount is within the above range.

[0030] <UV absorber (E)> The resin composition of this embodiment preferably contains an ultraviolet absorber (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 including the ultraviolet absorber (E), a molded product with excellent weather resistance can be obtained. Examples of UV absorbers (E) 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.

[0031] 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.)

[0032] 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.

[0033] In addition to the above, the ultraviolet absorber (E) 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.

[0034] In the resin composition of this embodiment, the content of the ultraviolet absorber (E) 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 the 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 (E) is preferably 1 part by mass or less, more preferably 0.8 parts by mass or less, even 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 the 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, by using 0.2 parts by mass or more of polycarbonate resin (A) and methacrylic copolymer (B) relative to a total of 100 parts by mass, the effect of maintaining moisture and heat resistance tends to improve significantly. The resin composition of this embodiment may contain only one type of ultraviolet absorber (E), 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.

[0035] <Hindered amine-based light stabilizer (F)> The resin composition of this embodiment contains a hindered amine-based light stabilizer (F) in a ratio of 0.1 to 1 part 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 (F), it is possible to provide molded articles with excellent weather resistance and heat and humidity resistance.

[0036] The hindered amine-based light stabilizer (F) 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 (F) 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 (F) 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).

[0037] 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.

[0038] In this embodiment, the hindered amine light stabilizer (F) 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.)

[0039] The hindered amine light stabilizer (F) 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.

[0040] The content of the hindered amine-based light stabilizer (F) 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 0.25 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 (F) in the resin composition of this embodiment is preferably 1 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 (F), 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.

[0041] In this embodiment, it is particularly preferable that the content of the ultraviolet absorber (E) is 0.2 to 1 part 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 (E) to the hindered amine-based light stabilizer (F), (E) / (F), is 1.1 or less. Furthermore, it is even more preferable that the hindered amine-based light stabilizer (F) 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.

[0042] <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.

[0043] Examples of stabilizers include heat stabilizers and antioxidants. Other examples of stabilizers include phenolic, amine, phosphorus, and thioether-based stabilizers. In this embodiment, in particular, a phenolic antioxidant (G) and / or a phosphorus-based heat stabilizer (H) are preferred.

[0044] <<Phenol-based antioxidant (G)>> The resin composition of this embodiment preferably contains a phenolic antioxidant (G), 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.

[0045] 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."

[0046] The content of the phenolic antioxidant (G) (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, 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 phenolic antioxidant (G) within the above range, the effect of adding the phenolic antioxidant (G) is more effectively exhibited. The resin composition of this embodiment may contain only one type of phenolic antioxidant (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.

[0047] <<Phosphorus-based heat stabilizer (H)>> The resin composition of this embodiment preferably contains a phosphorus-based heat stabilizer (H). Any known phosphorus-based heat stabilizer (H) 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.

[0048] 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.

[0049] The content of the phosphorus-based heat stabilizer (H) 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 (H) 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 (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.

[0050] Furthermore, in the resin composition of this embodiment, the mass ratio of phosphorus-based heat stabilizer (H) to phenol-based antioxidant (G), i.e., phosphorus-based heat stabilizer (H) / phenol-based antioxidant (G), is preferably 0.1 to 1.0, and more preferably 0.3 to 0.8. By setting it within this range, the photodegradation of the resulting molded product can be suppressed more effectively. In particular, the phenol-based antioxidant (G) can neutralize peroxides derived from the phosphorus-based heat stabilizer (H).

[0051] <<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.

[0052] <<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.

[0053] 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.

[0054] 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.

[0055] <Physical properties of resin compositions> The molded article formed from the resin composition of this embodiment preferably exhibits excellent color development. Specifically, when the resin composition of this embodiment is molded to a thickness of 2 mm, the hue L* when set to 2° field of view using the reflection method according to JIS Z7822, more preferably 7 or less, and even more preferably 6 or less. The lower limit is ideally 0, but values ​​of 0.1 or higher, and even 1 or higher, are sufficient to meet the required performance. The hue L* is measured according to the example described below. These hues are achieved by compounding a polycarbonate resin (A) with a methacrylic copolymer (B) and an acrylic copolymer (C).

[0056] It is preferable that the molded article formed from the resin composition of this embodiment has a large water droplet contact angle. Specifically, when the resin composition of this embodiment is molded into a 2 mm thick flat plate, the water droplet contact angle is more preferably 75° or higher, even more preferably 77° or higher, even more preferably 79° or higher, and even more preferably 80° or higher. There is no particular upper limit to the water droplet contact angle, but it can be 105° or lower, 100° or lower, or 98° or lower. Such a high water droplet contact angle is achieved by incorporating (D) a water-repellent agent. The water droplet contact angle is measured according to the description in the examples below.

[0057] The resin composition of this embodiment is preferably excellent in weather resistance. For example, the resin composition of this embodiment is molded into a 2 mm thick test piece, and the cumulative irradiation dose is 150 MJ / m². 2 It is preferable that the color difference ΔE before and after light irradiation is 8.0 or less, more preferably 7.5 or less, even more preferably 6.5 or less, and even more preferably 5.5 or less. Such high weather resistance is achieved by incorporating a hindered amine light stabilizer (F), particularly by using a hindered amine light stabilizer with a large molecular weight (e.g., a number-average molecular weight of 1000 or more), and even more specifically by using an NR-type hindered amine light stabilizer with a large molecular weight (e.g., a number-average molecular weight of 1000 or more). Weather resistance is measured according to the examples described below.

[0058] The resin composition of this embodiment preferably has excellent resistance to moisture and heat. In particular, when the resin composition of this embodiment is molded into an ISO standard multipurpose test specimen (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 tensile fracture point strain ((tensile fracture point strain after humid heat treatment / initial tensile fracture point strain) × 100) is preferably 35% or more, more preferably 40% or more, and even more preferably 45% 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-based light stabilizer (F) with a number average molecular weight of 1000 or more, or more specifically, an NR-type hindered amine-based light stabilizer with a number average molecular weight of 1000 or more and represented by the above formula (HALS-1). The moisture and heat resistance is measured according to the description in the examples below.

[0059] <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 employed. For example, a method may be used in which a polycarbonate resin (A), a methacrylic copolymer (B), an acrylic copolymer (C), a linear or branched polyorganosiloxane (D) having aromatic and / or alkoxy groups, as well as an ultraviolet absorber (E), a hindered amine-based light stabilizer (F), and other components added as needed are pre-mixed using various mixers such as a tumbler or a 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.

[0060] <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.

[0061] 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.

[0062] The molded article of this embodiment, which includes polycarbonate resin and styrene-based resin, can be widely used in applications where water repellency, color, and weather resistance are required. 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]

[0063] 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. 1. Using the following raw materials

[0064] [Table 1]

[0065] [Table 2]

[0066] (F1): Uvinul 5050H The structure is shown below. In the following, p 1 The range is 6-9. [ka] (F2): Tinuvin 622SF. The structure is shown below. [ka]

[0067] 2. Examples 1-23, Comparative Examples 1-5 <Compound> Each component listed in Tables 1 and 2 was mixed in the amounts listed in Tables 4 to 9 below (all components are expressed in parts by mass) in a tumbler mixer for 20 minutes. The mixture was then supplied to a twin-screw extruder TEX30α manufactured by Japan Steel Works, Ltd., equipped with one vent, and kneaded 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 into strands was rapidly cooled in a water bath and pelletized using a pelletizer to obtain resin composition pellets.

[0068] <Color development (initial hue)> 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.

[0069] <Water droplet contact angle> For the 2mm thick portion of the three-tiered plate obtained above, static electricity was removed and the surface temperature was adjusted to 23°C. Then, using a microsyringe, ion-exchanged water with a droplet diameter of 1.0mm was dropped onto the plate, and the contact angle (water droplet contact angle) (unit: degrees) was measured. The measurement device used was the DropMaster 300 solid-liquid interface analyzer manufactured by Kyowa Interface Science Co., Ltd.

[0070] <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]

[0071] <Heat and moisture resistance> The pellets obtained above were dried at 120°C for 5 hours, and then injection molded using a NEX140III injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd., with a cylinder temperature of 260°C, an ISO standard multipurpose test specimen (ISO 3167 type A) mold, and a mold temperature of 80°C to form an ISO standard multipurpose test specimen (ISO 3167 type A). Using the obtained ISO test specimens (4 mm thick), the tensile fracture point strain (in %) was measured in accordance with ISO 527. The obtained test specimens were left to stand for 125 hours, 250 hours, 375 hours, and 500 hours, respectively, in an atmosphere of 80°C and 95% relative humidity (moist heat treatment). Moisture heat resistance was evaluated by comparing the tensile fracture point strain before and after moist heat treatment. Specifically, the retention rate of the tensile fracture point strain after moist heat treatment relative to the initial tensile fracture point strain was calculated according to the following formula. Retention rate (%) = (Tensile fracture point strain after moist heat treatment / Initial tensile fracture point strain) × 100

[0072] [Table 4]

[0073] [Table 5]

[0074] [Table 6]

[0075] [Table 7]

[0076] [Table 8]

[0077] [Table 9]

[0078] In Tables 4-9 above, this means that NA was not measured. As is clear from the above results, molded articles with excellent water repellency, color development, and weather resistance were obtained from the resin composition of this embodiment. Furthermore, molded articles with excellent heat and humidity resistance were obtained from the resin composition of this embodiment. In contrast, when the polyorganosiloxane, which is the water repellent (D), did not have either aromatic or alkoxy groups (Comparative Examples 1 and 2), surprisingly, the color development was poor. In particular, when neither the specified polyorganosiloxane nor paraffin wax was included (Comparative Example 1), the weather resistance was also poor. Also, when the content of the water repellent (D) was high (Comparative Example 3), the weather resistance was poor. When the water repellent (D) was not included (D) (Comparative Example 4), both water repellency and weather resistance were poor. Furthermore, when the specified methacrylic copolymer (B) and acrylic copolymer (C) were not included (Comparative Example 5), the weather resistance was poor.

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), It comprises 0.05 to 3 parts by mass of a linear or branched polyorganosiloxane (D) having aromatic groups and / or alkoxy groups, The methacrylic copolymer (B) comprises styrene units and alkyl methacrylate units, The acrylic copolymer (C) comprises alkyl methacrylate units and alkyl acrylate units. Resin composition.

2. Furthermore, the resin composition according to claim 1, comprising 0.1 to 1 part by mass of an ultraviolet absorber (E) and 0.1 to 1 part by mass of a hindered amine-based light stabilizer (F) per 100 parts by mass of a total of polycarbonate resin (A) and methacrylic copolymer (B).

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

4. The resin composition according to claim 2, wherein the hindered amine light stabilizer (F) 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.)

5. The resin composition according to claim 2, wherein the hindered amine-based light stabilizer (F) 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.)

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

7. The resin composition according to claim 1, wherein the acrylic copolymer (C) comprises 10 to 50% by mass of methyl methacrylate units and 50 to 90% by mass of butyl acrylate units.

8. 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.

9. 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).

10. The aforementioned hindered amine-based light stabilizer (F) 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 weight-average molecular weight of the acrylic copolymer (C) is 50,000 to 200,000. The acrylic copolymer (C) contains 10 to 50% by mass of methyl methacrylate units and 50 to 90% by mass of butyl acrylate units. 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 2, 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.)

11. Pellets of the resin composition according to any one of claims 1 to 10.

12. A molded article formed from the resin composition according to any one of claims 1 to 10.

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