WO2023163417A1 - Thermoplastic resin composition and molded product manufactured therefrom - Google Patents

Abstract

A thermoplastic resin composition of the present invention comprises, on the basis of approximately 100 parts by weight of a base material comprising (A) approximately 40-70 wt% of a polyamide resin, (B) approximately 5-25 wt% of a phosphorus-based flame retardant, (C) approximately 20-50 wt% of a glass fiber, and (D) approximately 1-5 wt% of a melamine-based flame retardant, (E) approximately 0.5-3 parts by weight of zinc borate and (F) approximately 0.3-2 parts by weight of magnesium oxide. The thermoplastic resin composition has excellent flame retardancy, impact resistance, external appearance characteristics, mechanical properties and the like.

Description

Thermoplastic resin composition and molded article manufactured therefrom

The present invention relates to a thermoplastic resin composition and a molded article made therefrom.

Thermoplastic resin compositions used in automobile parts or electrical appliances have industry standards for flame retardancy, and excellent electrical insulation and flame retardancy are required. In accordance with recent environmental issues, the supply of electric vehicles is being supported by governments of each country, and accordingly, the demand for electric vehicle batteries is increasing. Although it is important in general electrical appliances, flame retardancy in a thin film of a thermoplastic resin composition is considered important as safety becomes an issue in automotive battery applications. In addition, in order to be used in automobile parts or electrical appliances, mechanical properties such as tensile strength and flexural modulus must be excellent while satisfying the above properties.

Polyamide resins provide excellent heat resistance and formability, so they are useful as thermoplastic resins used in automobile parts or electrical appliances. However, polyamide resins lack flame resistance, so a flame retardant must be added to provide flame retardancy required for specific applications. Bromine-based compounds and antimony-based compounds may be used as the flame retardant, but bromine-based compounds may cause environmental problems when the composition is burned, so when bromine-based compounds and antimony-based compounds are included, their use may be limited. .

Accordingly, in order to improve the flame retardancy of the polyamide resin, a non-brominated flame retardant such as a phosphorus flame retardant is used, but the addition of the flame retardant causes a decrease in heat resistance and impact resistance. In this case, a phenomenon in which the flame retardancy is lowered again occurs. In addition, additives for improving electrical insulation improve electrical properties, but are accompanied by deterioration of physical properties.

In addition, in the case of a phosphorus-based flame retardant, when extruded with a resin, phosphoric acid is generated, which may cause deterioration in appearance characteristics due to gas and single yarn, and there is a problem that the extruder may be corroded.

Therefore, there is a need for a flame retardant polyamide resin composition having excellent flame retardancy, impact resistance, mechanical properties and appearance properties.

An object of the present invention is to provide a thermoplastic resin composition excellent in flame retardancy, impact resistance, appearance characteristics, mechanical properties and the like.

Another object of the present invention is to provide a molded article manufactured from the thermoplastic resin composition.

The above and other objects of the present invention can all be achieved by the present invention described below.

1. One aspect of the present invention relates to a thermoplastic resin composition. The thermoplastic resin composition may include (A) about 40 to about 70% by weight of a polyamide resin; (B) about 5 to about 25% by weight of a phosphorus-based flame retardant; (C) about 20 to about 50 weight percent glass fibers; And (D) based on about 100 parts by weight of the base material including about 1 to about 5% by weight of a melamine-based flame retardant, (E) about 0.5 to about 3 parts by weight of zinc borate; and (F) about 0.3 to about 2 parts by weight of magnesium oxide.

2. In the first embodiment, the polyamide resin (A) is polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 4T, polyamide 410, polyamide 510, polyamide 1010, polyamide 1012, polyamide 10T, polyamide 1212, polyamide 12T, polyamide MXD6, or combinations thereof.

3. In the above 1 or 2 embodiment, the (A) polyamide resin may be polyamide 66.

4. In the above 1 to 3 embodiments, the (B) phosphorus flame retardant is aluminum diethyl phosphinate, triphenyl phosphate, ammonium polyphosphate, resorcinol-di (bis-2,6-dimethylphenyl) phosphate (resorcinol-di (bis-2,6-dimethylphenyl) phosphate), bisphenol A diphenyl phosphate, cyclophosphazene (cyclophosphazene), diethyl phosphite diethyl phosphinate ammonium salt, or a combination thereof.

5. In the above 1 to 4 embodiments, the (B) phosphorus-based flame retardant may be aluminum diethyl phosphinate.

6. In the embodiments 1 to 5, the (C) melamine-based flame retardant is melamine polyphosphate, melamine/ammonium polyphosphate, melamine phosphate, melamine pyrophosphate ( melamine pyrophosphate), or a combination thereof.

7. In the embodiments 1 to 6, the (C) melamine-based flame retardant may be melamine polyphosphate.

8. In embodiments 1 to 6, the weight ratio of (B) the phosphorus-based flame retardant and (D) the melamine-based flame retardant may be about 2:1 to about 15:1.

9. In the embodiments 1 to 8, the thermoplastic resin composition is selected from antibacterial agents, flame retardants, nucleating agents, coupling agents, fillers, plasticizers, impact modifiers, lubricants, release agents, heat stabilizers, antioxidants, UV stabilizers, pigments, and dyes It may further include at least one additive.

10. Another aspect of the invention relates to molded articles. The molded article is prepared from the thermoplastic resin composition of 1 to 9 above.

11. In the 10 embodiments, the molded article may have an Izod impact strength of about 7 kgf cm/cm or more measured according to ASTM D256 for a notched 1/4 inch thick specimen.

12. In the 10th or 11th embodiment, 2 g of the molded article in the form of a pellet was placed in a glass Petri dish having a diameter of 80 mm, covered with a glass plate on top, and then heated on a hot plate at 290 ° C. The gas generation amount measured through the weight increase of the glass plate after heating for 2 hours in a hot plate may be less than about 7,000 ppm.

13. In the embodiments 10 to 12, the molded article may have a flame retardance of V0 or higher as measured according to UL94 standard for a 0.75 mm thick specimen.

The present invention has the effect of providing a thermoplastic resin composition excellent in flame retardancy, impact resistance, appearance characteristics, mechanical properties, etc., and a molded article manufactured therefrom.

Hereinafter, the present invention will be described in detail as follows.

The thermoplastic resin composition according to the present invention includes (A) a polyamide resin; (B) a phosphorus-based flame retardant; (C) glass fibers; (D) a melamine-based flame retardant; (E) zinc borate; and (F) magnesium oxide.

In this specification, unless otherwise specified, "copolymerization" means block copolymerization, random copolymerization, and graft copolymerization, and "copolymer" means block copolymer, random copolymer, and graft copolymer.

Unless otherwise specified in the present specification, the weight average molecular weight is measured by dissolving a powder sample in an appropriate solvent and using Agilent Technologies' 1200 series Gel Permeation Chromatography (GPC) (standard sample is Shodex's polystyrene). used).

In this specification, "a to b" representing a numerical range is defined as "≥a and ≤b".

(A) polyamide resin

In one embodiment, the polyamide resin enables the thermoplastic resin composition to realize excellent mechanical properties.

In one embodiment, various polyamide resins known in the art may be used as the polyamide resin, for example, an aromatic polyamide resin, an aliphatic polyamide resin, or a mixture thereof, and is not particularly limited.

The aromatic polyamide resin is a polyamide resin including an aromatic group in a main chain, and may be a wholly aromatic polyamide resin, a semi-aromatic polyamide resin, or a mixture thereof.

The wholly aromatic polyamide resin refers to a polymer of aromatic diamine and aromatic dicarboxylic acid, and the semi-aromatic polyamide resin includes at least one aromatic unit and at least one non-aromatic unit between amide bonds. do. For example, the semi-aromatic polyamide resin may be a polymer of an aromatic diamine and an aliphatic dicarboxylic acid, or a polymer of an aliphatic diamine and an aromatic dicarboxylic acid.

Meanwhile, the aliphatic polyamide resin refers to a polymer of aliphatic diamine and aliphatic dicarboxylic acid.

Examples of the aromatic diamine include p-xylene diamine and m-xylene diamine, but are not limited thereto. In addition, these may be used alone or in combination of two or more.

Examples of the aromatic dicarboxylic acid include, but are not limited to, phthalic acid, isophthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, and (1,3-phenylenedioxy)diacetic acid. . In addition, these may be used alone or in combination of two or more.

Examples of the aliphatic diamine include, but are not limited to, ethylenediamine, trimethylenediamine, hexamethylenediamine, dodecamethylenediamine, and piperazine. In addition, these may be used alone or in combination of two or more.

Examples of the aliphatic dicarboxylic acid include adipic acid, sebacic acid, succinic acid, glutaric acid, azelaic acid, dodecanedioic acid, dimer acid, cyclohexanedicarboxylic acid, and the like, but are not limited thereto no. In addition, these may be used alone or in combination of two or more.

In one embodiment, the polyamide resin is polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 4T, polyamide amide 410, polyamide 510, polyamide 1010, polyamide 1012, polyamide 10T, polyamide 1212, polyamide 12T, polyamide MXD6, or combinations thereof.

In one embodiment, the polyamide resin may be polyamide 66.

In one embodiment, the polyamide resin may be included in about 40 to about 70% by weight, for example, about 50 to about 70% by weight, for example, about 50 to about 60% by weight, based on 100% by weight of the base material. there is.

When the content of the polyamide resin satisfies the aforementioned range, the thermoplastic resin composition and molded articles manufactured therefrom may exhibit excellent mechanical properties due to the polyamide resin.

(B) phosphorus flame retardant

In one embodiment, the phosphorus-based flame retardant reinforces the basic flame retardancy of the thermoplastic resin composition to realize a high level of flame retardancy.

As the phosphorus-based flame retardant usable in one embodiment, a conventional phosphorus-based flame retardant used to reinforce flame retardancy of a thermoplastic resin composition may be used. For example, phosphate compounds, phosphonate compounds, phosphinate compounds, phosphine oxide compounds, phosphazene compounds, metal salts thereof, and the like can be used. . The phosphorus-based flame retardants may be used alone or in combination of two or more.

Specifically, the phosphorus-based flame retardant is aluminum diethyl phosphinate, triphenyl phosphate, ammonium polyphosphate, resorcinol-di (bis-2,6-dimethylphenyl) phosphate (resorcinol-di(bis-2,6-dimethylphenyl) phosphate), bisphenol A diphenyl phosphate, cyclophosphazene, diethyl phosphinate ammonium salt, or Combinations of these may be included.

In one embodiment, the phosphorus-based flame retardant may be aluminum diethyl phosphinate.

The phosphorus-based flame retardant is about 5 to about 25% by weight, for example about 5 to about 20% by weight, for example about 10 to about 20% by weight, for example about 10 to about 15% by weight, based on 100% by weight of the base material. may be included in weight percent. When the content of the phosphorus-based flame retardant satisfies the aforementioned range, the thermoplastic resin composition and molded articles manufactured therefrom may maintain excellent moldability and flame retardancy and excellent mechanical properties.

(C) glass fiber

In one embodiment, glass fiber (GF) may serve to improve flame retardancy as well as improve mechanical properties such as tensile strength of the thermoplastic resin composition.

Glass fibers usable in one embodiment may be glass fibers used in conventional thermoplastic resin compositions.

The diameter of the glass fiber may be about 1 to about 20 μm, for example about 1 to about 15 μm, for example about 1 to about 10 μm, for example about 1 to about 5 μm, but Not limited.

The average length of the glass fibers before processing may be about 10 mm or less, for example about 1 to about 8 mm, for example about 1 to about 5 mm, for example about 1 to about 3 mm, but Not limited.

When the average diameter and average length of the glass fibers are within the above ranges, mechanical properties of the thermoplastic resin composition including the glass fibers may be excellent.

The glass fiber may be circular, elliptical, rectangular, or dumbbell-shaped in cross section, and two or more types having different cross-sectional shapes, diameters, lengths, etc. may be mixed and used.

Meanwhile, in order to improve bonding between the glass fiber and the thermoplastic resin, the surface of the glass fiber may be surface-treated with a predetermined material, and the fluidity and impact resistance of the thermoplastic resin composition may vary depending on the type of surface treatment agent.

As the surface treatment agent, a silane-based compound, an epoxy-based compound, or a urethane-based compound may be used, and surface treatment agents that are commonly commercialized and used may be used without limitation.

In one embodiment, the glass fiber may be included in about 20 to about 50% by weight, for example, about 30 to about 40% by weight, for example, about 30 to about 35% by weight, based on 100% by weight of the base material. . When the content of the glass fiber satisfies the aforementioned range, the thermoplastic resin composition and molded articles manufactured therefrom may exhibit excellent mechanical properties.

(D) Melamine-based flame retardant

In one embodiment, the thermoplastic resin composition includes (D) a melamine-based flame retardant, and the (D) melamine-based flame retardant is used together with (B) a phosphorus-based flame retardant to reinforce the flame retardancy of the thermoplastic resin composition to achieve a high level of flame retardancy. make it come true

The (D) melamine-based flame retardant may be included in about 1 to about 5% by weight, for example, about 1 to about 4% by weight, for example, about 1 to about 3% by weight, based on 100% by weight of the base material. .

The melamine-based flame retardant usable in one embodiment may include a conventional melamine-based flame retardant used to reinforce flame retardancy of a thermoplastic resin composition.

Specifically, the melamine-based flame retardant includes melamine polyphosphate, melamine/ammonium polyphosphate, melamine phosphate, melamine pyrophosphate, or a combination thereof can do.

In one embodiment, the melamine-based flame retardant may be melamine polyphosphate.

When the (B) phosphorus-based flame retardant and (D) melamine-based flame retardant are included together, their weight ratio may be about 2:1 to about 15:1. Specifically, the weight ratio of the (B) phosphorus-based flame retardant and (D) melamine-based flame retardant is about 2:1 to about 10:1, about 2:1 to about 5:1, or about 3:1 to about 5:1 can Within the above weight ratio range, flame retardancy of the thermoplastic resin composition and molded articles manufactured therefrom may be further improved.

(E) Zinc borate

In one embodiment, zinc borate (ZnB) may impart excellent flame retardancy to the thermoplastic resin composition.

The zinc borate may be included in about 0.5 to about 3 parts by weight, for example, about 0.5 to about 2 parts by weight, for example, about 0.5 to about 1 part by weight, based on about 100 parts by weight of the base material. In the range of parts by weight, flame retardancy, impact resistance, and appearance characteristics of the thermoplastic resin composition and molded articles prepared therefrom may be excellent.

(F) magnesium oxide

In one embodiment, magnesium oxide (MgO) can significantly reduce the amount of gas generated due to the use of a phosphorus-based flame retardant. Accordingly, the thermoplastic resin composition according to one embodiment and a molded article manufactured therefrom may have excellent appearance characteristics.

In one embodiment, magnesium oxide may be included in about 0.3 to about 2 parts by weight, for example, about 0.3 to about 1.5 parts by weight, for example, about 0.3 to about 1 part by weight, based on about 100 parts by weight of the base material. In the range of parts by weight, the impact resistance, mechanical properties and appearance of the thermoplastic resin composition and molded products manufactured therefrom can be excellently maintained.

(G) additives

In addition to the components (A) to (F), the thermoplastic resin composition according to an embodiment can exhibit excellent mechanical properties, flame retardancy, and appearance characteristics, while balancing each physical property, or the final use of the thermoplastic resin composition. According to the necessary one or more additives may be further included.

Specifically, as the additives, antibacterial agents, nucleating agents, coupling agents, fillers, plasticizers, lubricants, release agents, heat stabilizers, antioxidants, UV stabilizers, pigments, dyes, etc. may be used, and these may be used alone or in combination of two or more. .

These additives may be appropriately included within a range that does not impair the physical properties of the thermoplastic resin composition, for example, about 20 parts by weight or less based on about 100 parts by weight of the base material, but is not limited thereto.

Meanwhile, the thermoplastic resin composition according to one embodiment may be mixed with other resins or other rubber components and used together.

Meanwhile, another embodiment provides a molded article manufactured using the thermoplastic resin composition according to the embodiment. The molded article may be manufactured by various methods known in the art, such as injection molding and extrusion molding, using the thermoplastic resin composition.

The molded article may have an Izod impact strength of about 7 kgf·cm/cm or more measured according to ASTM D256 standard for a notched 1/4 inch thick specimen.

The molded article may have a tensile strength of about 1,500 kgf/cm ² or more when measured under a tensile speed condition of 5 mm/min according to ASTM D638 standard for a 3.2 mm thick specimen.

The molded article was prepared by putting about 2 g of the molded article in the form of a pellet into a glass Petri dish having a diameter of about 80 mm, covering the top with a glass plate, and then heating it on a hot plate at 290 ° C. for 2 hours. The gas generation amount measured through the weight increase of the glass plate after processing may be less than about 7,000 ppm.

On the other hand, the molded article according to one embodiment may have a flame retardance of V0 or higher measured according to the UL94 standard for a 0.75 mm thick specimen.

Hereinafter, the present invention will be described in more detail through examples, but these examples are only for the purpose of explanation and should not be construed as limiting the present invention.

Examples 1 to 3 and Comparative Examples 1 to 7

The thermoplastic resin compositions of Examples 1 to 3 and Comparative Examples 1 to 7 were prepared according to the component content ratios shown in Table 1 below, respectively.

After mixing the components listed in Table 1 and quantitatively and continuously introduced into the supply part of a twin-screw extruder (L/D = 36, Φ = 45 mm) set at a barrel temperature of about 290 ° C, extruding / kneading the thermoplastic resin composition in the form of pellets was manufactured. Then, after drying the thermoplastic resin composition pellets at about 80 ° C. for about 4 hours, a cylinder temperature of about 280 ° C. and a mold temperature of about 80 ° C. were set using a 6 oz injection molding machine, and a specimen for measuring physical properties was prepared. The measured physical properties are shown in Tables 2 and 3 below.

In Table 1, the content of each of (A), (B), (C) and (D) is a weight% value expressed as a percentage of the weight of each component when the sum of their total weight is 100% by weight And, the contents of components (E) and (F) are relative parts by weight when the sum of the total weights of (A), (B), (C), and (D) is 100 parts by weight.

division	Example			comparative example
	One	2	3	One	2	3	4	5	6	7
(A)	52	52	52	52	52	52	52	52	52	52
(B)	10	10	10	13	10	10	10	10	10	7
(C)	35	35	35	35	35	35	35	35	35	35
(D)	3	3	3	-	3	3	3	3	3	6
(E)	One	One	One	One	One	One	One	-	5	One
(F)	0.3	0.5	1.0	0.3	-	3.0	5.0	0.3	0.3	0.3

A description of each component described in Table 1 is as follows.

(A) polyamide resin

Asahi Kasei Corporation's polyamide 66 resin (product name: Leona ^TM 1200) was used.

(B) phosphorus flame retardant

Chempia's aluminum diethylphosphinate (product name: FR-133L) was used.

(C) glass fiber

Glass fiber (product name: ECS03T-251H) manufactured by Nippon Electric Glass, which has a circular cross section, a diameter of about 10 μm, and an average length before processing of about 3 mm, and which has been surface-treated with a urethane-based compound, was used.

(D) Melamine-based flame retardant

Chempia's melamine polyphosphate (product name: MPP-D) was used.

(E) Zinc borate

U.S. Borax's zinc borate (product name: Firebrake® 500) was used.

(F) magnesium oxide

Magnesium oxide (product name: Kyowamag 150) from Kyowa Chemical Industry was used.

Property evaluation

The experimental results are shown in Tables 2 and 3 below.

(1) Impact resistance (unit: kgf cm/cm)

Izod impact strength was measured according to the ASTM D256 standard for a 1/4 inch thick specimen having a notch.

(2) Mechanical properties (tensile strength) (unit: kgf/cm ² )

Tensile strength of a 3.2 mm thick specimen was measured at a tensile speed of 5 mm/min according to the ASTM D638 standard.

(3) Mechanical properties (flexural modulus) (unit: kgf/cm ² )

The flexural modulus was measured for a 6.4 mm thick specimen under a crosshead speed condition of 2.8 mm/min according to ASTM D790 standard.

(4) Heat resistance (Unit: ℃)

Heat deflection temperature (HDT) was measured under a load condition of 1.86 MPa according to ASTM D648.

(5) Fogging test (unit: ppm)

About 2 g of a sample of the thermoplastic resin composition in pellet form was placed in a glass Petri dish with a diameter of about 80 mm, the top was covered with a glass plate, and then heated on a hot plate at 290 ° C. for 2 hours. After dividing the increase in weight of the glass plate by the weight of the initial sample, gas generation was measured. It was judged that the appearance characteristics were excellent as the amount of gas generation was small.

(6) Flame retardancy (unit: flame retardant grade)

For 0.75 mm thick specimens, flame retardancy was evaluated according to the vertical test method of the UL94 standard.

division	Example			comparative example
	One	2	3	One	2
impact strength	7.9	8.1	8.2	8.3	7.3
tensile strength	1,530	1,580	1,588	1,521	1,490
Flexural modulus	2,400	2,412	2,350	2,328	2,320
heat deflection temperature	235	236	234	235	234
gas generation	6,979	6,659	6,850	5,838	10,107
flame retardant rating	V0	V0	V0	Fail	V0

division	comparative example
	3	4	5	6	7
impact strength	6.8	5.3	8.2	5.6	7.8
tensile strength	1,500	1,438	1,524	1,573	1,510
Flexural modulus	2,340	2,248	2,418	2,438	2,348
heat deflection temperature	237	238	234	237	234
gas generation	6,890	6,483	8,083	6,183	8,873
flame retardant rating	V0	V0	Fail	V0	Fail

From Table 1, Table 2 and Table 3, it can be confirmed that the thermoplastic resin compositions of Examples are excellent in physical properties such as impact strength, tensile strength, flexural modulus, etc., as well as flame retardancy and appearance characteristics, compared to the thermoplastic resin compositions of Comparative Examples. can

In particular, it can be seen that Comparative Example 2, which does not contain magnesium oxide, has a significantly higher amount of gas generation than Examples. From this, it can be seen that by including magnesium oxide in the thermoplastic resin composition, it is possible to manufacture a molded article having excellent appearance characteristics by significantly reducing the amount of gas generated during manufacture of the molded article.

So far, the present invention has been looked at mainly through embodiments. Those skilled in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

Claims (13)

1. (A) about 40 to about 70 weight percent of a polyamide resin;

   (B) about 5 to about 25% by weight of a phosphorus-based flame retardant;

   (C) about 20 to about 50 weight percent glass fibers; and

   (D) with respect to about 100 parts by weight of a base material containing about 1 to about 5% by weight of a melamine-based flame retardant,

   (E) about 0.5 to about 3 parts by weight of zinc borate; and

   (F) A thermoplastic resin composition comprising about 0.3 to about 2 parts by weight of magnesium oxide.
2. The method of claim 1, wherein the (A) polyamide resin is polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, Polyamide 4T, Polyamide 410, Polyamide 510, Polyamide 1010, Polyamide 1012, Polyamide 10T, Polyamide 1212, Polyamide 12T, Polyamide MXD6, or a combination thereof. .
3. The thermoplastic resin composition according to claim 1 or 2, wherein the polyamide resin (A) is polyamide 66.
4. The method of any one of claims 1 to 3, wherein (B) the phosphorus-based flame retardant is aluminum diethyl phosphinate, triphenyl phosphate, ammonium polyphosphate, Resorcinol-di (bis-2,6-dimethylphenyl) phosphate, bisphenol A diphenyl phosphate, cyclophosphazene, A thermoplastic resin composition comprising diethyl phosphinate ammonium salt, or a combination thereof.
5. The thermoplastic resin composition according to any one of claims 1 to 4, wherein (B) the phosphorus-based flame retardant is aluminum diethyl phosphinate.
6. The method of any one of claims 1 to 5, wherein the (D) melamine-based flame retardant is melamine polyphosphate, melamine/ammonium polyphosphate, melamine phosphate, melamine Pyrophosphate (melamine pyrophosphate), or a thermoplastic resin composition comprising a combination thereof.
7. The thermoplastic resin composition according to any one of claims 1 to 6, wherein (C) the melamine-based flame retardant is melamine polyphosphate.
8. The thermoplastic resin composition according to any one of claims 1 to 7, wherein the weight ratio of (B) the phosphorus-based flame retardant and (D) the melamine-based flame retardant is from about 2:1 to about 15:1.
9. The method of any one of claims 1 to 8, wherein the thermoplastic resin composition is an antibacterial agent, a flame retardant, a nucleating agent, a coupling agent, a filler, a plasticizer, an impact modifier, a lubricant, a release agent, a heat stabilizer, an antioxidant, a UV stabilizer, a pigment, A thermoplastic resin composition further comprising at least one additive selected from dyes.
10. A molded article characterized in that it is produced from the thermoplastic resin composition according to any one of claims 1 to 9.
11. 11. The molded article according to claim 10, wherein the molded article has an Izod impact strength of about 7 kgf·cm/cm or more, measured according to ASTM D256, for a notched 1/4 inch thick specimen.
12. The molded article according to claim 10 or 11, wherein 2 g of the molded article in the form of pellets is placed in a glass Petri dish having a diameter of 80 mm, the top is covered with a glass plate, and then heated on a hot plate at 290 ° C. A molded article characterized in that the amount of gas generated is less than about 7,000 ppm measured through the weight increase of the glass plate after heating on a hot plate for 2 hours.
13. The molded article according to any one of claims 10 to 12, wherein the molded article has a flame retardancy of V0 or more measured according to UL94 standard for a 0.75 mm thick specimen.