Molded article manufactured from thermoplastic resin composition

Abstract

The present invention relates to a molded article manufactured from a thermoplastic resin composition comprising a polycarbonate-based polymer, a polysiloxane-polycarbonate copolymer, a polysiloxane-polyester copolymer, and a benzotriazole-based UV stabilizer having a molecular weight equal to or greater than about 1800.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Korean Patent Application No. 10-2023-0112994 filed in the Korean Intellectual Property Office on August 28, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to a molded product made from a thermoplastic resin composition. Background Art

[0003] Engineering plastics are used to replace metals in fields such as machine components and structural materials. Such engineering plastics are used for weight reduction and other purposes in various fields such as interior / exterior parts of automobiles. Among engineering plastics, polycarbonate obtained by polycondensation of aromatic diols (e.g., bisphenol-A) and carbonate precursors (e.g., phosgene) has high transparency and impact resistance as well as excellent mechanical and thermal properties, and is therefore used as engineering plastics in various fields (e.g., for lamp covers, etc.).

[0004] On the other hand, polycarbonate lacks chemical resistance, scratch resistance and weather resistance (especially UV stability). In the past, attempts have been made to reduce these disadvantages by additional processes such as surface treatment and coating, but recently, interest in eco-friendliness is increasing, and the demand for unpainted materials is also increasing due to cost reduction issues. Therefore, it is becoming increasingly difficult to apply previously proposed post-treatments such as surface treatment or coating to improve the physical properties of polycarbonate.

[0005] A method of using silicone and / or montan-based wax has been proposed to improve the scratch resistance of polycarbonate. However, since silicone has a low refractive index, when silicone is used on polycarbonate, optical properties deteriorate. In addition, montan-based wax is easily decomposed due to its low molecular weight, or hardly contributes to improving scratch resistance.

[0006] Furthermore, a method of improving the UV stability of polycarbonate using a radical scavenger (eg, an amine-based radical scavenger) and / or a UV absorber has been proposed, but the radical scavenger decomposes the polycarbonate and the UV absorber decomposes at a processing temperature of the polycarbonate. Summary of the invention

[0007] The present invention aims to solve the above-mentioned problems in the prior art while maintaining the advantages achieved by the prior art.

[0008] Exemplary embodiments of the present invention provide a molded article that can have excellent properties derived from polycarbonate while having excellent scratch resistance and excellent weather resistance (particularly UV stability).

[0009] The technical problems to be solved by the present invention are not limited to the above-mentioned problems, and those skilled in the art to which the present invention belongs will clearly understand any other technical problems not mentioned herein through the following description.

[0010] According to an exemplary embodiment of the present invention, there is provided a molded article made of a thermoplastic resin composition, the thermoplastic resin composition including a polycarbonate-based polymer, a polysiloxane-polycarbonate copolymer, a polysiloxane-polyester copolymer, and a benzotriazole-based UV stabilizer having a molecular weight equal to or greater than about 1,800.

[0011] The polycarbonate-based polymer may be a copolymer containing two or more types of repeating units, a blend of polycarbonate polymers having different repeating units, or a combination thereof.

[0012] The polycarbonate-based polymer may have a weight average molecular weight in a range of about 10,000 g / mol to about 50,000 g / mol.

[0013] The polycarbonate-based polymer may include two or more types of polycarbonate-based polymers having different weight average molecular weights.

[0014] The polysiloxane-polycarbonate copolymer may have a weight average molecular weight in a range of about 15,000 g / mol to about 40,000 g / mol.

[0015] The molar ratio of the polysiloxane repeating unit to the polycarbonate repeating unit in the polysiloxane-polycarbonate copolymer may be in the range of about 0.5:99.5 to about 5:95.

[0016] The polysiloxane-polyester copolymer can be represented by the following Chemical Formula 1:

[0017] [Chemical formula 1]

[0018]

[0019] Where R 1 , R 2 , R 3 and R 4 are each independently an alkylene group having 1 to 5 carbon atoms, and m and n may be integers equal to or greater than 1. The integer ratio of m to n in Chemical Formula 1 may be in the range of about 1:2 to about 2:1. R in Chemical Formula 1 1 and R2 For -(CH 2 ) 3 -, R 3 and R 4 For -(CH 2 ) 5 -, and m and n may be integers equal to or greater than 1, satisfying m:n=about 18:30.

[0020] The benzotriazole-based UV stabilizer may have a molecular weight equal to or less than about 3,000.

[0021] The molded article may not include a benzotriazole-based UV stabilizer having a molecular weight equal to less than about 500.

[0022] The molded article may not contain wax.

[0023] The wax may be a silicone and / or montan-based wax.

[0024] The molded article may not contain a free radical scavenger. The molded article may not contain a UV absorber.

[0025] The thermoplastic resin composition may include about 70 to about 95 parts by weight of the polycarbonate-based polymer.

[0026] The thermoplastic resin composition may include about 70 to about 95 parts by weight of a polycarbonate-based polymer, about 5 to about 30 parts by weight of a polysiloxane-polycarbonate copolymer, about 0.3 to about 1 parts by weight of a polysiloxane-polyester copolymer, and about 2 to about 5 parts by weight of a benzotriazole-based UV stabilizer.

[0027] In some embodiments, a vehicle comprising a molded article is provided.

[0028] In some embodiments, a vehicle roof rack comprising or attached to a molding is provided. The vehicle roof rack may include a light adjacent to the molding such that light from the light is emitted through the molding.

[0029] As discussed, the methods and systems suitably include the use of a controller or processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present invention will become more apparent through the following detailed description in conjunction with the accompanying drawings:

[0031] Figure 1 is a photograph of a molded article produced from the thermoplastic resin composition of Example 1 of the present application. DETAILED DESCRIPTION

[0032] It should be understood that the term "vehicle" or "vehicular" or other similar terms used herein generally include motor vehicles, such as passenger cars including sports utility vehicles (SUVs), buses, trucks, various commercial vehicles; watercraft including various ships and boats; aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). As described herein, a hybrid vehicle is a vehicle with two or more power sources, such as a gasoline-powered vehicle and an electric vehicle.

[0033] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to limit the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are also intended to include plural forms. These terms are only intended to distinguish one component from another component, and these terms do not limit the properties, sequence or order of the components. It should also be understood that when the terms "comprises" and / or "comprising" are used in this specification, the existence of the features, integers, steps, operations, elements and / or components is specified, but the existence or addition of more than one other features, integers, steps, operations, elements, components and / or their groups is not excluded. As used herein, the term "and / or" includes any and all combinations of more than one related listed items. Throughout the specification, unless clearly described to the contrary, the term "comprises" and variations such as "comprises" or "comprising" will be understood to include the elements, but do not exclude any other elements. In addition, the terms "unit", "-er", "-instrument" and "module" described in the specification refer to units for processing at least one function and operation, and can be implemented by hardware components or software components and their combinations.

[0034] Although the exemplary embodiments are described as using multiple units to perform the exemplary processes, it should be understood that the exemplary processes can also be performed by one or more modules. In addition, it should be understood that the term controller / control unit refers to a hardware device that includes a memory and a processor and is specifically programmed to perform the processes described herein. The memory is configured to store the modules, and the processor is specifically configured to execute the modules to perform one or more processes further described below.

[0035] In addition, the control logic of the present invention may be embodied as non-transitory computer readable media on a computer readable medium containing executable program instructions executed by a processor, controller, etc. Examples of computer readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer readable medium may also be distributed in a network coupled computer system so that the computer readable medium is stored and executed in a distributed fashion, such as by a telematics server or a controller area network (CAN).

[0036] Unless otherwise specified or apparent from the context, as used herein, the term "about" is to be understood as being within the normal tolerance of the art, such as within 2 standard deviations of the mean. "About" may be understood as being within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless the context clearly dictates otherwise, all numerical values ​​provided herein are modified by the term "about".

[0037] As used herein, "based" means that the element or constituent is the major component of the composition, preferably comprising at least 50% by weight of the composition.

[0038] Unless otherwise specified herein, “copolymerization” refers to block copolymerization, random copolymerization or graft copolymerization, and “copolymer” refers to block copolymer, random copolymer or graft copolymer.

[0039] Unless otherwise specified herein, weight average molecular weight was measured using Agilent Technologies' 1200 series gel permeation chromatography after dissolving a powder sample in a suitable solvent.

[0040] The present invention provides a molded article made of a thermoplastic resin composition, which comprises (A) a polycarbonate-based polymer; (B) a polysiloxane-polycarbonate copolymer; (C) a polysiloxane-polyester copolymer and (D) a benzotriazole-based UV stabilizer having a molecular weight equal to or greater than 1,800.

[0041] Thermoplastic resin composition (A) polycarbonate-based polymer

[0042] In one embodiment of the present invention, the thermoplastic resin composition may include a polycarbonate-based polymer. The polycarbonate-based polymer is a polyester having a carbonate bond, and its type is not particularly limited. Any available polycarbonate known in the art can be used for the polycarbonate-based polymer.

[0043] In one embodiment of the present invention, the polycarbonate-based polymer may refer to a homopolymer composed of polycarbonate repeating units, a copolymer containing polycarbonate repeating units, and a blend containing a homopolymer and / or a copolymer. However, in this article, the polycarbonate-based polymer refers to a polymer that does not correspond to the (B) polysiloxane-polycarbonate copolymer to be described later.

[0044] The polycarbonate-based polymer may include a repeating unit obtained from at least one selected from the group consisting of diphenol, phosgene, halogenacid ester, and carbonate.

[0045] Specific examples of diphenols may include hydroquinone, resorcinol, 4,4'-dihydroxybiphenyl, 2,2-bis(4-hydroxyphenyl)propane (also known as 'bisphenol-A'), 2,4-bis(4-hydroxyphenyl)-2-methylbutane, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(3-chloro-4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)ketone, bis(4-hydroxyphenyl)ether, and the like. Among the above examples of diphenols, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane or 1,1-bis(4-hydroxyphenyl)cyclohexane can be used. More preferably, 2,2-bis(4-hydroxyphenyl)propane can be used.

[0046] As the polycarbonate-based polymer, a linear polycarbonate-based polymer, a branched polycarbonate-based polymer, a polyester-carbonate copolymer, or the like can be used.

[0047] Specific examples of linear polycarbonate-based polymers may include bisphenol-A based polycarbonates. Specific examples of branched polycarbonate-based polymers may include polymers prepared by reacting polyfunctional aromatic compounds such as trimellitic anhydride and trimellitic acid with diphenols and carbonates. Polyester carbonate copolymers may be prepared by reacting difunctional carboxylic acids with diphenols and carbonates, and the carbonate used herein may be a diaryl carbonate, such as diphenyl carbonate or ethylene carbonate.

[0048] In one embodiment of the present invention, the polycarbonate-based polymer can be a polycarbonate copolymer containing two or more types of repeating units, a blend of polycarbonate polymers with different repeating units, or a combination thereof. The blend of polycarbonate polymers with different repeating units herein can be a mixture of a homopolymer and / or a copolymer with different repeating units.

[0049] In one embodiment of the present invention, the weight average molecular weight of the polycarbonate-based polymer may be in the range of 10000 to 50000 g / mol, 14000 to 40000 g / mol, or 18000 to 30000 g / mol. When the weight average molecular weight of the polycarbonate-based polymer satisfies the above range, the thermoplastic resin composition may have excellent fluidity, and the impact resistance of a molded article made from the thermoplastic resin composition may be improved.

[0050] In one embodiment of the present invention, the polycarbonate-based polymer may include two or more types of polycarbonate-based polymers having different weight average molecular weights. In this case, the thermoplastic resin composition may have excellent fluidity and the weather resistance of a molded article made from the thermoplastic resin composition may be improved.

[0051] The content of the polycarbonate-based polymer may be in the range of 70 to 95 parts by weight, 75 to 93 parts by weight, or 80 to 91 parts by weight relative to 5 to 30 parts by weight of the polysiloxane-polycarbonate polymer. When the content of the polycarbonate-based polymer satisfies the above range, the moldability of the thermoplastic resin composition may be improved, and the impact resistance of a molded article made from the thermoplastic resin composition may be improved.

[0052] (B) Polysiloxane-polycarbonate copolymer

[0053] In one embodiment of the invention, thermoplastic resin composition can include polysiloxane-polycarbonate copolymer.Polysiloxane-polycarbonate copolymer can have improved impact strength (for example, low temperature impact strength, surface impact strength, etc.) and excellent chemical resistance while maintaining the excellent mechanical properties derived from polycarbonate.The type of polysiloxane-polycarbonate copolymer is not particularly limited.The known siloxane compounds and carbonate compounds available in the prior art can be copolymerized and used as polysiloxane-polycarbonate copolymer, or commercially available materials can be used as polysiloxane-polycarbonate copolymer.

[0054] The polysiloxane-polycarbonate copolymer may be prepared by polymerizing diphenol, at least one selected from the group consisting of phosgene, halogen ester and carbonate, and a siloxane-based monomer. Here, the detailed description of the diphenol is the same as the above description.

[0055] The siloxane monomer may be at least one selected from the group consisting of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcycloheptasiloxane, dodecamethylcycloheptasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, and octaphenylcyclotetrasiloxane.

[0056] In one embodiment of the present invention, the weight average molecular weight of the polysiloxane-polycarbonate copolymer may be in the range of 15000 g / mol to 40000 g / mol, 20000 g / mol to 35000 g / mol, or 23000 g / mol to 30000 g / mol. When the weight average molecular weight of the polysiloxane-polycarbonate copolymer satisfies the above range, the processability and plasticity of the thermoplastic resin composition may be improved, and the impact resistance and chemical resistance of the molded article manufactured from the thermoplastic resin composition may be excellent.

[0057] In one embodiment of the present invention, the molar ratio of the polysiloxane repeating unit and the polycarbonate repeating unit in the polysiloxane-polycarbonate copolymer may be in the range of 0.5:99.5 to 5:95, 0.8:99.2 to 4:96, or 1:99 to 3:97. When the molar ratio satisfies the above range, the impact resistance of the molded article manufactured from the thermoplastic resin composition may be excellent.

[0058] The content of the polysiloxane-polycarbonate copolymer may be in the range of 5 to 30 parts by weight, 7 to 25 parts by weight, or 9 to 23 parts by weight relative to 70 to 95 parts by weight of the polycarbonate-based polymer. When the content of the polysiloxane-polycarbonate copolymer satisfies the above range, the impact resistance, transmittance, and weather resistance of a molded article made of the thermoplastic resin composition may be improved.

[0059] (C) Polysiloxane-Polyester Copolymer

[0060] In one embodiment of the present invention, the thermoplastic resin composition may include a polysiloxane-polyester copolymer. The polysiloxane-polyester copolymer can improve the scratch resistance of a molded article made from the thermoplastic resin composition. The type of the polysiloxane-polyester copolymer is not particularly limited. Silicone compounds and ester compounds known in the art can be copolymerized and used as the polysiloxane-polyester copolymer, or commercially available materials can be used as the polysiloxane-polyester copolymer.

[0061] In one embodiment of the present invention, the polysiloxane-polyester copolymer may be represented by Chemical Formula 1 below.

[0062] [Chemical formula 1]

[0063]

[0064] (In Chemical Formula 1, R 1 , R 2 , R 3 and R 4 Each is independently an alkylene group having 1 to 5 carbon atoms, and m and n are integers equal to or greater than 1.)

[0065] In one embodiment of the present invention, the integer ratio of m to n in Chemical Formula 1 may be in the range of 1:2 to 2:1 or 6:10 to 10:6. When the integer ratio of m to n satisfies the above range, a molded article made of the thermoplastic resin composition may have excellent transparency and scratch resistance.

[0066] In one embodiment of the present invention, R in the above chemical formula 1 1 and R 2 Can be -(CH 2 ) 3 -, R 3 and R 4 Can be -(CH 2 ) 5 -, and m and n may be integers equal to or greater than 1, satisfying that m:n is approximately 18:30.

[0067] The content of the polysiloxane-polyester copolymer may be in the range of 0.3 to 1 part by weight or 0.4 to 1.3 parts by weight relative to 70 to 95 parts by weight of the polycarbonate-based polymer. When the content of the polysiloxane-polyester copolymer satisfies the above range, the scratch resistance, impact resistance, transmittance and weather resistance of a molded article made of the thermoplastic resin composition may be improved.

[0068] (D) Benzotriazole-based UV stabilizer

[0069] In one embodiment of the present invention, the thermoplastic resin composition may contain a benzotriazole-based UV stabilizer. The benzotriazole-based UV stabilizer can improve the weather resistance and thermal stability of the molded product manufactured from the thermoplastic resin composition. The type of the benzotriazole-based UV stabilizer is not particularly limited as long as the molecular weight range described later is met. The benzotriazole-based compounds available and known in the art can be modified and used as benzotriazole-based UV stabilizers, or commercially available materials can be used as benzotriazole-based UV stabilizers.

[0070] In one embodiment of the present invention, the benzotriazole-based UV stabilizer may have a molecular weight in the range of 1800 to 3000 or 1900 to 2500. When the molecular weight of the benzotriazole-based UV stabilizer satisfies the above range, the thermoplastic resin composition may have excellent thermal stability, thereby reducing volatility, and the weather resistance of a molded article made of the thermoplastic resin composition may be improved.

[0071] The content of the benzotriazole-based UV stabilizer may be in the range of 2 to 5 parts by weight or 2.5 to 4 parts by weight relative to 70 to 95 parts by weight of the polycarbonate-based polymer. When the content of the benzotriazole-based UV stabilizer satisfies the above range, the impact resistance and weather resistance of a molded article manufactured from the thermoplastic resin composition may be excellent.

[0072] Molding

[0073] The molded article of the present invention is manufactured by molding the above-mentioned thermoplastic resin composition. The thermoplastic resin composition can be prepared in the form of pellets, and the prepared pellets can be manufactured into various molded articles by various molding methods such as injection molding, extrusion molding, vacuum molding and casting molding. Here, there is no particular limitation on the molding method of the thermoplastic resin composition, and various known molding methods can be applied.

[0074] The molded article of the present invention may have excellent physical properties (e.g., impact resistance, scratch resistance, transparency, and weather resistance) derived from the polycarbonate-based polymer, polysiloxane-polycarbonate copolymer, polysiloxane-polyester copolymer, and benzotriazole-based UV stabilizer contained in the above-mentioned thermoplastic resin composition. In one example, the benzotriazole-based UV stabilizer may have a molecular weight equal to or greater than 1800. In this case, the molded article manufactured from the thermoplastic resin composition may have excellent weather resistance (particularly UV stability). (A) [Example]

[0075] Hereinafter, the present invention is described in more detail by way of examples. However, such examples are only intended to help understand the present invention, and the scope of the present invention is not limited to such examples in any way.

[0076] Examples 1 to 7 and Comparative Examples 1 to 4

[0077] Each of Examples 1 to 7 and Comparative Examples 1 to 4, which are thermoplastic resin compositions according to the present invention, was prepared by mixing the components shown in Table 1 below with each other to form a mixture and extrusion-molding the mixture to be formed in the form of pellets. Next, the prepared pellets were dried and then injection-molded to produce a molded article. The components used herein are shown in Table 2.

[0078] [Table 1]

[0079] [Table 2]

[0080] Experimental example

[0081] Measurement method Impact resistance: Notched Izod impact strength was measured at room temperature based on the evaluation method specified in ISO 180 1A.

[0082] ◎ (Excellent): Impact strength equal to or greater than 12 kJ / m 2

[0083] △(Normal): Impact strength equal to or greater than 10kJ / m 2 And less than 12kJ / m 2

[0084] X (Insufficient): Impact strength less than 10 kJ / m 2 Scratch resistance: Using Ericshen evaluation equipment, scratching was performed in a grid pattern under the conditions of 20 scratches at a load of 10 N and a scratching speed of 1000 mm / min, and the presence or absence of scratches was determined with the naked eye.

[0085] Not present: No scratches visible to naked eye

[0086] Presence: Scratches can be detected with naked eyes Transparency: Based on the method of ASTM D1003, the transmittance of a sample with a thickness of 3 mm was measured at room temperature.

[0087] ◎ (Excellent): Transmittance equal to or greater than 80%

[0088] △ (normal): Transmittance is equal to or greater than 50% and less than 80%

[0089] X (insufficient): Transmittance is less than 50% Weather resistance: Cut as Figure 1 The molded article shown (1200 mm x 25 mm x 3 mm) was irradiated with 2500 kJ under SAE J2527. The color change (ΔE) was then measured using a BYK solid spectrophotometer with a D65 light source and BYK 45 / 0 geometry.

[0090] ◎(Excellent): Color change (△E) less than 3

[0091] △(Normal): Color change (△E) is equal to or greater than 3 and less than 6

[0092] X (deficient): Color change (△E) equal to or greater than 6

[0093] Measurement results

[0094] In one embodiment, the evaluation result values ​​measured using the above test method are shown in Table 3 below.

[0095] [Table 3] Impact resistance Scratch resistance transparency Weather resistance Example 1 ◎ Does not exist ◎ ◎ Example 2 ◎ Does not exist ◎ ◎ Example 3 ◎ Does not exist ◎ ◎ Example 4 ◎ Does not exist ◎ △ Example 5 ◎ Does not exist ◎ △ Example 6 ◎ Does not exist △ X Example 7 X Does not exist ◎ ◎ Comparative Example 1 X Does not exist X X Comparative Example 2 △ exist ◎ ◎ Comparative Example 3 △ exist ◎ ◎ Comparative Example 4 △ Does not exist ◎ X

[0096] According to Table 3, the compounds in Examples 1 to 3 are excellent in impact resistance, scratch resistance, transparency, and weather resistance. Example 4 has slightly insufficient weather resistance due to containing a slightly small amount of a benzotriazole-based UV stabilizer. Example 5 has slightly insufficient weather resistance due to using one type of polycarbonate-based polymer. Example 6 has slightly insufficient transparency and insufficient weather resistance due to excessive use of polysiloxane-polyester. In addition, Example 7 has slightly insufficient impact resistance due to excessive use of a benzotriazole-based UV stabilizer.

[0097] On the other hand, Comparative Example 1 does not contain a polysiloxane-polycarbonate copolymer and is inferior in impact resistance, transparency and weather resistance. Comparative Example 2 does not contain a polysiloxane-polyester copolymer, so it has insufficient impact resistance and insufficient scratch resistance. Comparative Example 3 does not contain a polysiloxane-polyester copolymer but contains wax, so it has insufficient impact resistance and insufficient scratch resistance. Comparative Example 4 uses a benzotriazole-based UV stabilizer having a molecular weight of less than 1,800, so it has insufficient impact resistance and weather resistance.

[0098] The molded articles made from the thermoplastic resin composition of the present invention can have excellent impact resistance, scratch resistance and weather resistance (especially UV stability), can show high transparency, and can be used for interior / exterior parts of vehicles, electrical parts, electronic parts, etc. where such properties are required.

[0099] Although the present invention has been described above with reference to exemplary embodiments and the accompanying drawings, the present invention is not limited thereto and various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as claimed in the appended claims.

Claims

1. A molded article made from a thermoplastic resin composition, comprising: Polycarbonate-based polymers; Polysiloxane-polycarbonate copolymer; polysiloxane-polyester copolymer; and Benzotriazole based UV stabilizers having a molecular weight equal to or greater than about 1800. 2 . The molded article according to claim 1 , wherein the polycarbonate-based polymer is a copolymer comprising two or more types of repeating units, a blend of polycarbonate polymers having different repeating units, or a combination thereof. 3 . The molded article of claim 1 , wherein the polycarbonate-based polymer has a weight average molecular weight in a range of about 10,000 g / mol to about 50,000 g / mol. 4 . The molded article according to claim 1 , wherein the polycarbonate-based polymer comprises two or more types of polycarbonate-based polymers having different weight average molecular weights. 5 . The molded article of claim 1 , wherein the polysiloxane-polycarbonate copolymer has a weight average molecular weight in the range of about 15,000 g / mol to about 40,000 g / mol. 6 . The molded article according to claim 1 , wherein a molar ratio of the polysiloxane repeating unit to the polycarbonate repeating unit in the polysiloxane-polycarbonate copolymer is in the range of about 0.5:99.5 to about 5:

95.

7. The molded article according to claim 1, wherein the polysiloxane-polyester copolymer is represented by the following Chemical Formula 1: [Chemical formula 1] wherein R1, R2, R3 and R4 are each independently an alkylene group having 1 to 5 carbon atoms, and m and n are integers equal to or greater than 1. 8 . The molded article according to claim 7 , wherein an integer ratio of m to n in Chemical Formula 1 is in the range of about 1:2 to about 2:

1.

9. The molded article according to claim 7, wherein R1 and R2 in Chemical Formula 1 are -(CH2)3-, R3 and R4 are -(CH2)5-, and m and n are integers equal to or greater than 1, satisfying m:n of about 18:

30.

10. The molded article of claim 1, wherein the benzotriazole-based UV stabilizer has a molecular weight of about 3,000 or less.

11. The molded article of claim 1, wherein the molded article does not contain a benzotriazole-based UV stabilizer having a molecular weight of about 500 or less.

12. The molded article according to claim 1, wherein the molded article does not contain wax.

13. The molded article according to claim 12, wherein the wax is a silicone resin and / or a montan-based wax.

14. The molded article according to claim 1, wherein the molded article does not contain a radical scavenger.

15. The molded article according to claim 1, wherein the molded article does not contain a UV absorber.

16. The molded article of claim 1, wherein the thermoplastic resin composition comprises about 70 to about 95 parts by weight of the polycarbonate-based polymer.

17. The molded article according to claim 1, wherein the thermoplastic resin composition comprises about 70 to about 95 parts by weight of the polycarbonate-based polymer, about 5 to about 30 parts by weight of the polysiloxane-polycarbonate copolymer, about 0.3 to about 1 part by weight of the polysiloxane-polyester copolymer, and about 2 to about 5 parts by weight of the benzotriazole-based UV stabilizer.

18. A vehicle comprising the molded article according to claim 1.

19. A roof rack comprising or attached to the molded article of claim 1.

20. The roof rack of claim 19, further comprising a light adjacent to the molding such that light from the light is emitted through the molding.

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