Thermoplastic resin composition and molded article produced therefrom

Abstract

The thermoplastic resin composition of the present invention is characterized by comprising about 100 parts by weight of a polypropylene resin having a melt flow index (MI) of about 5 g / 10 min to about 80 g / 10 min measured according to ASTM D1238 at 230°C and a load of 2.16 kg; about 0.5 parts by weight to about 10 parts by weight of a polyolefin resin having a melt flow index (MI) of about 150 g / 10 min to about 1,000 g / 10 min measured according to ASTM D1238 at 230°C and a load of 2.16 kg; about 5 parts by weight to about 15 parts by weight of a bromine compound having a melting point (Tm) of about 100°C to about 150°C; about 1 part by weight to about 8 parts by weight of an antimony compound; about 0.5 parts by weight to about 5 parts by weight of a radical former; and about 0.2 parts by weight to about 5 parts by weight of a phosphorus-based heat stabilizer. The thermoplastic resin composition is excellent in flame retardancy, glossiness, whiteness, blooming resistance, and the balance of these physical properties.

Description

[Technical Field]

[0001] The present invention relates to a thermoplastic resin composition and a molded article produced therefrom. More specifically, the present invention relates to a thermoplastic resin composition having excellent flame retardancy, gloss, whiteness, blooming resistance, and a balance of these physical properties, and to a molded article produced therefrom. [Background technology]

[0002] Polypropylene resin is a material that is widely used in fields such as automobiles, building materials, and electrical components due to its excellent properties such as light weight and flexibility. However, due to its chemical structure, polypropylene resin has flammable properties, so various organic or inorganic flame retardants are added in combination to impart flame retardant properties.

[0003] To use polypropylene products as exterior materials, the product may require high gloss, but if a flame retardant with a high melting point (Tm) is used, gloss may decrease. Also, if a flame retardant with a low melting point (Tm) is used, the gloss problem is solved, but thermal stability and color fastness may decrease during processing such as extrusion and injection, and blooming may occur if left for a long period of time.

[0004] As a result, attempts have been made to improve flame retardancy, gloss (appearance characteristics), discoloration resistance, etc. by applying melt-type flame retardants, flame retardant auxiliaries, hydroxylamine-based heat stabilizers, etc., but these methods also have the risk of blooming occurring due to the high content of flame retardants.

[0005] Therefore, there is a need to develop a thermoplastic resin composition that is excellent in flame retardancy, gloss, whiteness, blooming resistance, and a balance of these physical properties.

[0006] The background art of the present invention is disclosed in Korean Patent No. 10-0801823 and the like. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a thermoplastic resin composition which is excellent in flame retardancy, gloss, whiteness, blooming resistance, and a balance of these physical properties.

[0008] Another object of the present invention is to provide a molded article formed from the thermoplastic resin composition.

[0009] The above and other objects of the present invention can all be achieved by the present invention described below. [Means for solving the problem]

[0010] 1. One aspect of the present invention relates to a thermoplastic resin composition, comprising: about 100 parts by weight of a polypropylene resin having a melt flow index (MI) of about 5 g / 10 min to about 80 g / 10 min, measured according to ASTM D1238 at 230°C under a load of 2.16 kg; about 0.5 to about 10 parts by weight of a polyolefin resin having a melt flow index (MI) of about 150 g / 10 min to about 1,000 g / 10 min, measured according to ASTM D1238 at 230°C under a load of 2.16 kg; about 5 to about 15 parts by weight of a bromine compound having a melting point (Tm) of about 100°C to about 150°C; about 1 to about 8 parts by weight of an antimony compound; about 0.5 to about 5 parts by weight of a radical former; and about 0.2 to about 5 parts by weight of a phosphorus-based heat stabilizer.

[0011] 2. In the specific example of the above item 1, the polypropylene resin having a melt flow index (MI) of about 5 g / 10 min to about 80 g / 10 min can contain an ethylene-propylene block copolymer.

[0012] 3. In the specific example of 1 or 2 above, the ethylene-propylene block copolymer may contain about 20% to about 60% by weight of ethylene and about 40% to about 80% by weight of propylene.

[0013] 4. In the specific examples 1 to 3 above, the ethylene-propylene block copolymer may contain about 60% by weight to about 95% by weight of a propylene homopolymer and about 5% by weight to about 40% by weight of an ethylene-propylene copolymer as a rubber component.

[0014] 5. In the specific examples of 1 to 4 above, the polyolefin resin having a melt flow index (MI) of about 150 g / 10 min to about 1,000 g / 10 min can include one or more of low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene.

[0015] 6. In the specific examples of 1 to 5 above, the bromine compound may include one or more of 2,2-bis(3,5-dibromo-4-(2,3-dibromopropoxy)phenyl)propane and octabromobisphenol-S.

[0016] 7. In the specific examples 1 to 6 above, the antimony compound may include one or more of antimony trioxide and antimony pentoxide.

[0017] 8. In the specific examples of 1 to 7 above, the radical former may include one or more of 2,3-dimethyl-2,3-diphenylbutane and 2,2-bis(hydroxymethyl)-1,3-propanediol.

[0018] 9. In the specific examples of 1 to 8, the phosphorus-based heat stabilizer may include one or more of octadecane-1-ol phosphate, sodium phosphate, and sodium pyrophosphate.

[0019] 10. In the above embodiments 1 to 9, the thermoplastic resin composition may have a flame retardancy of V-0 for a 0.8 mm thick injection specimen measured according to the UL-94 vertical test method.

[0020] 11. In the above specific examples 1 to 10, the thermoplastic resin composition may have a gloss of about 70% to about 95% on a 3.2 mm thick specimen measured at a 60° angle according to ASTM D523.

[0021] 12. In the specific examples 1 to 11 above, the thermoplastic resin composition may have an L value of about 90 to about 98 on a 3.2 mm thick specimen measured with a color difference meter according to ASTM E1164.

[0022] 13. Another aspect of the present invention relates to a molded article, characterized in that the molded article is formed from the thermoplastic resin composition according to any one of 1 to 12 above. [Effects of the Invention]

[0023] The present invention has the effect of providing a thermoplastic resin composition having excellent flame retardancy, gloss, whiteness, blooming resistance, and a balance of these physical properties, and a molded article formed therefrom. DETAILED DESCRIPTION OF THE INVENTION

[0024] [Best Mode for Carrying Out the Invention] The present invention will be described in detail below.

[0025] The thermoplastic resin composition of the present invention comprises: (A) a polypropylene resin having a melt flow index (MI) of about 5 g / 10 min to about 80 g / 10 min; (B) a polyolefin resin having a melt flow index (MI) of about 150 g / 10 min to about 1,000 g / 10 min; (C) a bromine compound having a melting point (Tm) of about 100°C to about 150°C; (D) an antimony compound; (E) a radical former; and (F) a phosphorus-based heat stabilizer.

[0026] In this specification, the numerical range "a to b" is defined as "≧a and ≦b".

[0027] (A) Polypropylene resin with a melt flow index (MI) of approximately 5 g / 10 min to approximately 80 g / 10 min The polypropylene resin of the present invention can improve the impact resistance, rigidity, moldability, etc. of a thermoplastic resin composition, and can be a polypropylene resin having a melt-flow index (MI) of about 5 g / 10 min to about 80 g / 10 min, for example about 5 g / 10 min to about 50 g / 10 min, measured according to ASTM D1238 at 230°C and a load of 2.16 kg. If the melt-flow index (MI) of the polypropylene resin is less than about 5 g / 10 min, the flowability, flame retardancy, etc. of the thermoplastic resin composition (molded article) may be reduced, while if it exceeds about 80 g / 10 min, the impact resistance, rigidity, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0028] In a specific example, the polypropylene resin may be an ethylene-propylene block copolymer (block polypropylene) that is commonly used in thermoplastic resin compositions. For example, the ethylene-propylene block copolymer may be a resin obtained by stepwise polymerization of a propylene homopolymer portion and an ethylene-propylene copolymer portion in a reactor.

[0029] In a specific example, the ethylene-propylene block copolymer may contain about 20% by weight to about 60% by weight, e.g., about 30% by weight to about 50% by weight, of ethylene and about 40% by weight to about 80% by weight, e.g., about 50% by weight to about 70% by weight of propylene. Within this range, the thermoplastic resin composition may have excellent moldability, impact resistance, etc.

[0030] In a specific example, the ethylene-propylene block copolymer may contain about 60% to about 95% by weight, e.g., about 70% to about 90% by weight, of a propylene homopolymer in the continuous phase (matrix), and about 5% to about 40% by weight, e.g., about 10% to about 30% by weight, of an ethylene-propylene copolymer in the dispersed phase rubber component. Within this range, the thermoplastic resin composition may have excellent rigidity, impact resistance, and the like.

[0031] (B) Polyolefin resin with a melt flow index (MI) of approximately 150 g / 10 min to approximately 1,000 g / 10 min In one embodiment of the present invention, the polyolefin resin can be used in combination with a bromine compound, an antimony compound, a radical former, a phosphorus-based heat stabilizer, or the like to improve the flame retardancy, gloss, whiteness, blooming resistance, and balance of these physical properties of a thermoplastic resin composition containing the polypropylene resin. The polyolefin resin has a melt flow index (MI) of about 150 g / 10 min to about 1,000 g / 10 min, e.g., about 150 g / 10 min to about 500 g / 10 min, as measured according to ASTM D1238 at 230°C and a load of 2.16 kg. If the melt flow index (MI) of the polyolefin resin is less than about 150 g / 10 min, the gloss and flame retardancy of the thermoplastic resin composition (molded article) may be reduced. If the MI exceeds about 1,000 g / 10 min, the impact resistance and rigidity of the thermoplastic resin composition (molded article) may be reduced.

[0032] In specific examples, the polyolefin resin may include low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, or a combination thereof.

[0033] In a specific example, the polyolefin resin may be included in an amount of about 0.5 to about 10 parts by weight, for example, about 1 to about 9 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the polyolefin resin is less than about 0.5 parts by weight, the gloss, whiteness, etc. of the thermoplastic resin composition (molded article) may be reduced, and if it exceeds about 10 parts by weight, the flame retardancy, impact resistance, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0034] (C) Bromine compounds with a melting point (Tm) of approximately 100°C to approximately 150°C A bromine compound according to one embodiment of the present invention can be used together with the polyolefin resin, antimony compound, radical former, phosphorus-based heat stabilizer, etc. to improve the flame retardancy, gloss, whiteness, blooming resistance, and balance of these physical properties of a thermoplastic resin composition containing the polypropylene resin. A bromine compound (bromine-based flame retardant) having a melting point (Tm) of about 100°C to about 150°C, for example, about 110°C to about 140°C, can be used. If the melting point (Tm) of the bromine compound is less than about 100°C, the processability and flame retardancy of the thermoplastic resin composition (molded article) may be reduced, while if it exceeds about 150°C, the flame retardancy, gloss and / or whiteness of the thermoplastic resin composition (molded article) may be reduced.

[0035] In a specific example, the bromine compound can include 2,2-bis(3,5-dibromo-4-(2,3-dibromopropoxy)phenyl)propane, octabromobisphenol-S, or a combination thereof.

[0036] In a specific example, the bromine compound may be contained in an amount of about 5 parts by weight to about 15 parts by weight, for example, about 6 parts by weight to about 14 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the bromine compound is less than about 5 parts by weight, the flame retardancy of the thermoplastic resin composition (molded article) may be reduced, and if it exceeds about 15 parts by weight, the blooming resistance, impact resistance, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0037] (D) Antimony compounds The antimony compound according to one embodiment of the present invention can be used together with the polyolefin resin, a bromine compound, a radical former, a phosphorus-based heat stabilizer, etc. to improve the flame retardancy, glossiness, whiteness, blooming resistance, and balance of these physical properties of the thermoplastic resin composition containing the polypropylene resin, and an antimony compound (antimony-based flame retardant auxiliary) used in a typical flame-retardant thermoplastic resin composition can be used.

[0038] In specific examples, the antimony compound can include antimony trioxide, antimony pentoxide, or a combination thereof.

[0039] In a specific example, the antimony compound may be contained in an amount of about 1 part by weight to about 8 parts by weight, for example, about 2 parts by weight to about 7 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the antimony compound is less than about 1 part by weight, the flame retardancy of the thermoplastic resin composition (molded article) may be reduced, and if it exceeds about 8 parts by weight, the gloss, impact resistance, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0040] In a specific example, the weight ratio (C:D) of the bromine compound (C) to the antimony compound (D) may be about 1:0.1 to about 1:1, for example, about 1:0.2 to about 1:0.9. Within this range, the flame retardancy, impact resistance, etc. of the thermoplastic resin composition (molded article) may be more excellent. (E) Radical former The radical former according to one embodiment of the present invention is applied together with the polyolefin resin, a bromine compound, an antimony compound, a phosphorus-based heat stabilizer, etc., and can improve the flame retardancy, glossiness, whiteness, blooming resistance, and balance of these physical properties of the thermoplastic resin composition containing the polypropylene resin. Radical formers used in ordinary thermoplastic resin compositions can be used.

[0041] In a specific example, the radical former can include 2,3-dimethyl-2,3-diphenylbutane, 2,2-bis(hydroxy-methyl)-1,3-propanediol, or a combination thereof.

[0042] In a specific example, the radical former may be included in an amount of about 0.5 parts by weight to about 5 parts by weight, for example, about 0.7 parts by weight to about 4 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the radical former is less than about 0.5 parts by weight, the flame retardancy of the thermoplastic resin composition (molded article) may be reduced, whereas if it exceeds about 5 parts by weight, the flame retardancy, whiteness, processability, impact resistance, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0043] (F) Phosphorus-based heat stabilizer The phosphorus-based heat stabilizer according to one embodiment of the present invention is used together with the polyolefin resin, a bromine compound, an antimony compound, a radical former, etc., to improve the flame retardancy, gloss, whiteness, blooming resistance, and balance of these physical properties of the thermoplastic resin composition containing the polypropylene resin. A phosphorus-based heat stabilizer containing phosphoric acid can be used.

[0044] In a specific example, the phosphorus-based heat stabilizer may include octadecan-1-ol, phosphoric acid, sodium phosphate, sodium pyrophosphate, or a combination thereof.

[0045] In a specific example, the phosphorus-based heat stabilizer may be included in an amount of about 0.2 to about 5 parts by weight, for example, about 0.5 to about 4 parts by weight, relative to about 100 parts by weight of the polypropylene resin. If the content of the phosphorus-based heat stabilizer is less than about 0.2 parts by weight, the whiteness and impact resistance of the thermoplastic resin composition (molded article) may be reduced, while if it exceeds about 5 parts by weight, the flame retardancy, processability, rigidity, etc. of the thermoplastic resin composition (molded article) may be reduced.

[0046] The thermoplastic resin composition according to one embodiment of the present invention may further contain additives commonly found in thermoplastic resin compositions. Examples of such additives include, but are not limited to, antioxidants, anti-dripping agents, lubricants, release agents, nucleating agents, antistatic agents, stabilizers, pigments, dyes, and mixtures thereof. When such additives are used, their content may be about 0.001 to about 40 parts by weight, for example, about 0.1 to about 5 parts by weight, per about 100 parts by weight of the polypropylene resin.

[0047] The thermoplastic resin composition according to one embodiment of the present invention can be in the form of pellets obtained by mixing the above-mentioned components and melt-extruding them at about 120°C to about 280°C, for example, about 180°C to about 220°C, using a conventional twin-screw extruder.

[0048] In a specific example, the thermoplastic resin composition may have a flame retardancy of V-0 for a 0.8 mm thick injection specimen measured according to the UL-94 vertical test method.

[0049] In a specific example, the thermoplastic resin composition may have a gloss of about 70% to about 95%, for example, about 72% to about 90%, on a 3.2 mm thick specimen measured at a 60° angle according to ASTM D523.

[0050] In a specific example, the thermoplastic resin composition may have an L value of about 90 to about 98, for example, about 91 to about 97, when measured using a color difference meter on a 3.2 mm thick specimen according to ASTM E1164.

[0051] The molded article according to the present invention is formed from the thermoplastic resin composition. The antibacterial thermoplastic resin composition can be prepared in the form of pellets, and the prepared pellets can be manufactured into various molded articles (products) using various molding methods, such as injection molding, extrusion molding, vacuum molding, and casting molding. These molding methods are well known to those skilled in the art. The molded article has excellent flame retardancy, gloss, whiteness, blooming resistance, and a good balance of these physical properties, making it useful as an interior / exterior material for electrical and electronic products, building materials, etc.

[0052] [Mode for carrying out the invention] The present invention will be described in more detail below with reference to examples. However, these examples are merely for illustrative purposes and should not be construed as limiting the present invention.

[0053] Example The specifications of the components used in the examples and comparative examples are as follows:

[0054] (A) Polypropylene resin An ethylene-propylene block copolymer (manufacturer: Lotte Chemical, product name: JH-370A, melt-flow index (MI): 28 g / 10 min) was used.

[0055] (B) Polyolefin resin (B1) Polypropylene (manufacturer: Polymile, product name: HP5021, melt-flow index (MI): 325 g / 10 min) was used.

[0056] (B2) Polypropylene (manufacturer: Lotte Chemical, product name: JSS-395N, melt-flow index (MI): 100 g / 10 min) was used.

[0057] (C) Bromine compound (C1) 2,2-bis(3,5-dibromo-4-(2,3-dibromopropoxy)phenyl)propane (BDDP, manufactured by Shandong Brother SCI. & TECH., product name: XZ-6800, melting point (Tm): 110°C) was used.

[0058] (C2) Octabromobisphenol-S (OBBS, manufacturer: Danxia Chemical, product name: DXFR-920, melting point (Tm): 118°C) was used.

[0059] (C3) Decabromodiphenyl ether (DBDPE, manufacturer: ALBEMARLE, product name: SAYTEX8010, melting point (Tm): 352°C) was used.

[0060] (D) Antimony compounds Antimony trioxide (Sb2O3, manufacturer: Ilson Antimony, product name: ANTIS W) was used.

[0061] (E) Radical former 2,3-Dimethyl-2,3-diphenylbutane (manufacturer: WUXI ZHUFENG FINE CHEMICAL, product name: Dicumene) was used.

[0062] (F) Phosphorus-based heat stabilizer Octadecan-1-ol phosphoric acid (manufacturer: WELLCHEM, product name: PAOE) was used.

[0063] Examples 1 to 14 and Comparative Examples 1 to 17 Each component was added in the amounts shown in Tables 1, 2, 3, and 4 below, and then extruded at 200°C to produce pellets. A twin-screw extruder with an L / D of 36 and a diameter of 45 mm was used for extrusion, and the produced pellets were dried at 80°C for at least 4 hours and then extruded into a 6oz injector (molding temperature: 260°C, mold temperature: 60°C) to produce specimens. The physical properties of the produced specimens were evaluated using the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

[0064] Measurement methods for physical properties (1) Flame retardancy: The flame retardancy of a 0.8 mm thick injection specimen was measured according to the UL-94 vertical test method.

[0065] (2) Glossiness (unit: %): The glossiness of a 3.2 mm thick test piece was measured at an angle of 60° according to ASTM D523.

[0066] (3) Whiteness: According to ASTM E1164, the L value of a 3.2 mm thick specimen was measured using a color difference meter (manufacturer: KONICA MINOLTA, device name: CM-3700d).

[0067] (4) Evaluation of blooming resistance: After leaving a test piece measuring 100 mm x 100 mm x 3.2 mm at 70°C for 72 hours, the occurrence of blooming on the test piece surface was checked with the naked eye (○: not occurred, ×: occurred).

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] [Table 4]

[0072] From the above results, it is clear that the thermoplastic resin composition of the present invention is excellent in flame retardancy, gloss, whiteness, blooming resistance, and the balance of these physical properties.

[0073] When the polyolefin resin of the present invention is used in an amount less than the range of the present invention (Comparative Example 1), gloss and other properties decrease. When the amount exceeds the range of the present invention (Comparative Example 2), flame retardancy and other properties decrease. When polypropylene (B2) having a melt flow index (MI) below the range of the present invention is used instead of the polyolefin resin of the present invention (Comparative Example 3), gloss and other properties decrease. When the bromine compound of the present invention is used in an amount less than the range of the present invention (Comparative Examples 4, 5, and 7), flame retardancy and other properties decrease. When the bromine compound of the present invention is used in an amount greater than the range of the present invention (Comparative Examples 6 and 8), blooming resistance and other properties decrease. When decabromodiphenyl ether (C3) having a melting point (Tm) exceeding the range of the present invention is used instead of the bromine compound of the present invention (Comparative Examples 9, 10, and 11), flame retardancy, gloss, and / or whiteness decrease depending on the content. It was found that when the antimony compound of the present invention was applied in an amount less than the range of the present invention (Comparative Example 12), flame retardancy, etc. was reduced, and when it was applied in an amount exceeding the range of the present invention (Comparative Example 13), gloss, etc. was reduced. It was found that when the radical former of the present invention was applied in an amount less than the range of the present invention (Comparative Example 14), flame retardancy, etc. was reduced, and when it was applied in an amount exceeding the range of the present invention (Comparative Example 15), flame retardancy, whiteness, etc. was reduced. It was also found that when the phosphorus-based heat stabilizer of the present invention was applied in an amount less than the range of the present invention (Comparative Example 16), whiteness, etc. was reduced, and when it was applied in an amount exceeding the range of the present invention (Comparative Example 17), flame retardancy, etc. was reduced.

[0074] The present invention has been described above with reference to the preferred embodiments. Those skilled in the art will understand that the present invention can be embodied in various modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is defined by the claims, not the foregoing description, and all variations within the scope of equivalents thereto should be construed as being within the scope of the present invention.

Claims

1. 100 parts by weight of an ethylene-propylene block copolymer having a melt flow index (MI) of 5 g / 10 min to 80 g / 10 min, measured according to ASTM D1238 at 230°C under a load of 2.16 kg; 0.5 parts by weight to 10 parts by weight of polypropylene having a melt flow index (MI) of 150 g / 10 min to 1,000 g / 10 min, measured according to ASTM D1238 at 230°C under a load of 2.16 kg; 5 to 15 parts by weight of one or more bromine compounds selected from the group consisting of 2,2-bis(3,5-dibromo-4-(2,3-dibromopropoxy)phenyl)propane and octabromobisphenol-S; 1 to 8 parts by weight of an antimony compound; 0.5 to 5 parts by weight of one or more radical formers selected from the group consisting of 2,3-dimethyl-2,3-diphenylbutane and 2,2-bis(hydroxymethyl)-1,3-propanediol; and 0.2 parts by weight to 5 parts by weight of a phosphorus-based heat stabilizer; A thermoplastic resin composition characterized in that the flame retardancy of a 0.8 mm thick injection test piece measured according to the UL-94 vertical test method is V-0.

2. The thermoplastic resin composition described in claim 1, characterized in that the ethylene-propylene block copolymer comprises a resin in which a propylene homopolymer portion and an ethylene-propylene copolymer portion are polymerized in stages in a reactor.

3. 2. The thermoplastic resin composition according to claim 1, wherein the ethylene-propylene block copolymer contains 20% to 60% by weight of groups derived from ethylene and 40% to 80% by weight of groups derived from propylene.

4. The thermoplastic resin composition according to claim 1 or 2, characterized in that the ethylene-propylene block copolymer contains 60% by weight to 95% by weight of a propylene homopolymer portion and 5% by weight to 40% by weight of an ethylene-propylene copolymer portion of a rubber component.

5. 5. The thermoplastic resin composition according to claim 1, wherein the antimony compound comprises at least one of antimony trioxide and antimony pentoxide.

6. The thermoplastic resin composition according to any one of claims 1 to 5, wherein the phosphorus-based heat stabilizer comprises at least one of octadecane-1-ol phosphate, sodium phosphate, and sodium pyrophosphate.

7. The thermoplastic resin composition according to any one of claims 1 to 6, characterized in that the gloss of a 3.2 mm thick test piece measured at an angle of 60° according to ASTM D523 is 70% to 95%.

8. The thermoplastic resin composition according to any one of claims 1 to 7, characterized in that the L value of a 3.2 mm thick test piece measured with a color difference meter according to ASTM E1164 is 90 to 98.

9. A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 8.

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