KR100511054B1 - Thermoplastic Resin Composition - Google Patents

Abstract

The thermoplastic resin composition of the present invention comprises (A) 40 to 95 parts by weight of rubber-modified styrene resin, (B) 5 to 60 parts by weight of polyphenylene ether resin, (C) 100 parts by weight of (A) + (B). 2 to 30 parts by weight of a styrene-acrylonitrile copolymer resin having an acrylonitrile content of 5 to 18% by weight, and (D) polystyrene or rubber-reinforced polystyrene resin 5 to 100 parts by weight of (A) + (B). 50 parts by weight, (E) 5 to 30 parts by weight of a phosphate ester compound, and (F) 100 parts by weight of (A) + (B) to 100 parts by weight of (A) + (B). It consists of 0.01-20 weight part of system compounds.

Description

Thermoplastic Resin Composition

Field of invention

The present invention relates to a thermoplastic resin composition. More specifically, the present invention provides a blend of rubber-modified styrene resin and polyphenylene ether resin, using a styrene copolymer as a compatibilizer, and adding a phosphonate compound to a resin composition to which a phosphate ester compound is applied as a flame retardant. The present invention relates to a resin composition having improved appearance and thermal stability.

Background of the Invention

Rubber modified styrene resins have been widely applied to various applications such as electrical appliances and office equipment because of their good processability, excellent physical properties, particularly impact strength and good appearance. However, since rubber modified styrene resin is combustible, when applied to heat-dissipating products such as personal computers or fax machines, the flame retardancy should be reinforced.

The most widely known flame retardant method is to impart flame retardant properties by applying a halogen-based compound and an antimony-based compound together to the rubber-modified styrene resin. As the halogen-based compound, polybromodiphenyl ether, tetrabromobisphenol A, a brominated substituted epoxy compound, chlorinated polyethylene and the like are mainly used. Antimony trioxide and antimony pentoxide are mainly used as an antimony compound.

The application of halogen and antimony compound together to impart flame retardancy has the advantage of easy flame retardancy and little property deterioration.However, the hydrogen halide gas generated during processing can damage the mold and burn during combustion. The occurrence of such a gas is likely to have a fatal effect on the human body. In particular, polybrominated diphenyl ethers, which are mainly halogen-based flame retardants, have a high possibility of generating very toxic gases such as dioxins and furans during combustion.

As a flame retardant that does not contain halogen, a method of imparting flame retardancy to a resin composition by adding a compound such as phosphorus or nitrogen has been researched. However, the phosphorus compound alone has a disadvantage of lowering the heat resistance of the rubber-modified styrene resin and insufficient flame retardancy. Its application is limited.

In general, rubber-modified styrene resins, particularly acrylonitrile-butadiene-styrene copolymer (ABS) resins, are hardly expected to have a flame retardant effect in a solid phase because almost all parts are decomposed and vaporized during combustion, and thus, there is little char residue. (Journal of Applied Polymer Science, 1998, vol 68, p 1067). Therefore, a high flame retardance can be obtained by adding a char forming agent so that the char can be produced smoothly. Char forming agent forms a three-dimensional carbon chain bond on the surface of the rubber molecule during combustion to effectively form the char to block the entry of oxygen from the outside and prevent the release of fuel from the inside.

Japanese Patent Laid-Open No. 7-48491 discloses a thermoplastic flame retardant resin in which a phosphate ester is applied as a flame retardant to a thermoplastic copolymer resin of a rubbery polymer and an aromatic vinyl monomer, and a phenolic resin in the form of a novolak is added as a char forming agent. However, phenolic resins not only lower the heat resistance of styrene resins, but also have insufficient char forming ability, so that a relatively large amount of phosphate ester and novolak resin must be added to obtain a desired flame retardancy. Has the disadvantage of further lowering.

The present inventors blended polyphenylene ether resin with rubber-modified styrene resin and used it as a basic resin to solve the problems of the existing flame retardant thermoplastic resin, and the styrene-acrylonitrile having an acrylonitrile content of 5 to 18% by weight. A copolymer resin is used as a compatibilizer and an aromatic phosphate ester compound is applied as a flame retardant to prevent mechanical property deterioration of the resin composition and to develop a thermoplastic resin composition having excellent flame retardancy. Patent Application Nos. 99-28442 and 99-28443 And No. 99-28444 (all filed on July 14, 1999), and the addition of polystyrene or rubber-reinforced polystyrene resin to the resin composition that has excellent thermal stability and improved flowability has already been applied for. -57030 (filed Dec. 13, 1999).

However, the flame retardant resin composition includes a phosphate ester compound added for flame retardancy unlike the conventional rubber modified styrene resin, and when the resin composition is used in an injection or extrusion process, the flow of resin due to the addition of a flame retardant Due to the balance problem, the RIB strength of the manufactured articles is lowered and the appearance is lowered.

In order to solve this problem, the present inventors have developed a resin composition in which the phosphonate-based flame retardant is added or used alone to improve the RIB strength, appearance, and thermal stability.

An object of the present invention is to provide a thermoplastic resin composition excellent in mechanical properties, thermal stability and flame retardancy.

Another object of the present invention is to provide a thermoplastic resin composition having improved RIB strength, appearance and thermal stability by adding a phosphonate-based flame retardant.

Still another object of the present invention is to provide a thermoplastic resin composition having excellent heat stability and flame retardancy and improved fluidity by adding polystyrene or rubber-reinforced polystyrene resin.

It is another object of the present invention to provide a thermoplastic resin composition having compatibility with rubber modified styrene resin and polyphenylene ether resin by using styrene-acrylonitrile copolymer resin having controlled acrylonitrile content as a kind of compatibilizer. It is to.

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

Summary of the Invention

The thermoplastic resin composition of the present invention comprises (A) 40 to 95 parts by weight of rubber-modified styrene resin, (B) 5 to 60 parts by weight of polyphenylene ether resin, (C) 100 parts by weight of (A) + (B). 2 to 30 parts by weight of a styrene-acrylonitrile copolymer resin having an acrylonitrile content of 5 to 18% by weight, and (D) polystyrene or rubber-reinforced polystyrene resin 5 to 100 parts by weight of (A) + (B). 50 parts by weight, (E) 5 to 30 parts by weight of a phosphate ester compound, and (F) 100 parts by weight of (A) + (B) to 100 parts by weight of (A) + (B). It consists of 0.01-20 weight part of system compounds.

Hereinafter, each component of the resin composition of the present invention will be described in detail.

(A) Rubber modified styrene resin (ABS resin)

Rubber modified styrene resin refers to a polymer in which a rubber polymer is dispersed in the form of particles in a matrix (continuous phase) made of an aromatic vinyl polymer, and an aromatic vinyl monomer and a vinyl monomer copolymerizable with the aromatic polymer in the presence of a rubber polymer. It is prepared by adding and polymerizing.

Such rubber-modified styrene-based resins can be prepared by known polymerization methods such as emulsion polymerization, suspension polymerization, and bulk polymerization, and are usually produced by mixing and extruding styrene-containing graft copolymer resin and styrene-containing copolymer resin. In the case of bulk polymerization, the rubber-modified styrene-based resin is produced by only one step reaction without producing the styrene-containing graft copolymer resin and the styrene-containing copolymer resin separately, but in any case, the rubber content of the final rubber-modified styrene-based resin component is It is suitable that 5 to 30% by weight based on the entire base resin.

Examples of such resins include acrylonitrile-butadiene-styrene copolymer resins (ABS), acrylonitrile-acryl rubber-styrene copolymer resins (AAS), acrylonitrile-ethylenepropylene rubber-styrene copolymer resins (AES) Etc.

The above resin may be applied to the styrene-containing graft copolymer resin alone or styrene-containing graft copolymer resin and styrene-containing copolymer resin together, preferably in consideration of their compatibility. In the present invention, (a ₁₎ styrene-containing graft copolymer resin are used from 20 to 100% by weight is mixed in, and (a ₂₎ Styrene-containing copolymer resin, 0 to 80% by weight.

(a ₁ ) Styrene-containing graft copolymer resin

Examples of the rubber used for the graft copolymer resin include diene rubbers such as polybutadiene, poly (styrene-butadiene) and poly (acrylonitrile-butadiene); Saturated rubber hydrogenated to the diene rubber; Acrylic rubbers such as isoprene rubber, chloroprene rubber and butyl polyacrylate; And ethylene-propylene-diene monomer terpolymer (EPDM) and the like, in particular, diene rubber is preferred, and more preferably butadiene rubber is suitable.

As the aromatic vinyl monomer in the graft polymerizable monomer mixture, styrene, α-methyl styrene, p-methyl styrene, and the like may be used. Among these, styrene is most preferable, and a monomer copolymerizable with the aromatic vinyl monomer may be used. Apply at least one of them. Preferable monomers include vinyl cyanide compounds such as acrylonitrile and unsaturated nitrile compounds such as methacrylonitrile.

Among the graft copolymer resins, rubber accounts for 10 to 60% by weight, and the components of the monomers grafted to the rubber are 50 to 82% by weight of aromatic vinyl monomers such as styrene, and vinyl cyanide or Unsaturated nitrile monomers are added at 18 to 50% by weight and graft copolymerized.

In addition, graft polymerization may be optionally performed by adding monomers such as acrylic acid, methacrylic acid, maleic anhydride, N-substituted maleimide, and the like to impart properties such as workability and heat resistance. The amount added is 40% by weight or less based on the graft resin as a whole.

In consideration of the impact strength and appearance in preparing the styrene-containing graft copolymer, the average size of the rubber particles is suitably in the range of 0.1 to 4 μm.

(a ₂ ) Styrene-containing copolymer resin

The styrene-containing copolymer resin is prepared according to the monomer ratio and compatibility of the graft copolymer resin prepared in the above composition except for rubber, and the components thereof are as follows. The styrene-containing copolymer resin is a resin obtained by copolymerizing an aromatic vinyl monomer and at least one monomer copolymerizable therewith.

As the aromatic vinyl monomer to be copolymerized, styrene, α-methyl styrene, p-methyl styrene and the like may be added. Of these, styrene is most preferred, and the weight ratio of the aromatic vinyl monomer in the components of the copolymer resin is 50 to 82% by weight. Corresponds to One or more monomers copolymerizable with the aromatic vinyl monomers may be introduced and applied thereto. As the monomer to be introduced, vinyl cyanide-based compounds such as acrylonitrile and unsaturated nitrile-based compounds such as methacrylonitrile are preferable, and 18 to 50% by weight of all components of the copolymer are introduced. Optionally, monomers such as acrylic acid, methacrylic acid, maleic anhydride, N-substituted maleimide and the like may be added and copolymerized at 40 wt% or less.

Rubber modified styrene resin (A) in the present invention is 20 to 100 weight of styrene-containing graft copolymer resin (a ₁ ) having a content of vinyl cyanide compound such as acrylonitrile 18 to 50% by weight, excluding the rubber component % And 0 to 80% by weight of a styrene-containing copolymer resin (a ₂ ) having a content of vinyl cyanide compound such as acrylonitrile of 18 to 50% by weight.

The rubber modified styrene resin (A) forms a basic resin together with the polyphenylene ether resin (B) described below, and the rubber modified styrene resin (A) constitutes 40 to 95 parts by weight of the basic resin, and The phenylene ether resin (B) constitutes 5 to 60 parts by weight.

(B) polyphenylene ether resin

The polyphenylene ether-based resin is added to the rubber-reinforced styrene resin itself because it is insufficient in flame retardancy and low in rigidity and heat resistance, it is used as a base resin. Such compounds include poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl-1,4-phenylene) ether, poly (2,6-dipropyl-1, 4-phenylene) ether, poly (2-methyl-6-ethyl-1,4-phenylene) ether, poly (2-methyl-6-propyl-1,4-phenylene) ether, poly (2-ethyl -6-propyl-1,4-phenylene) ether, poly (2,6-diphenyl-1,4-phenylene) ether, poly (2,6-dimethyl-1,4-phenylene) ether and poly Copolymer of (2,3,6-trimethyl-1,4-phenylene) ether and poly (2,6-dimethyl-1,4-phenylene) ether and poly (2,3,5-triethyl- Copolymers of 1,4-phenylene) ether. Preferably a copolymer of poly (2,6-dimethyl-1,4-phenylene) ether and poly (2,3,6-trimethyl-1,4-phenylene) ether, and poly (2,6-dimethyl -1,4-phenylene) ether is used, more preferably poly (2,6-dimethyl-1,4-phenylene) ether.

Although the polymerization degree of polyphenylene ether is not specifically limited, It is preferable that the intrinsic viscosity measured in the chloroform solvent at 25 degreeC is 0.2-0.8 in consideration of the thermal stability and workability of a resin composition.

(C) Styrene-acrylonitrile copolymer resin having an acrylonitrile content of 5-18 wt%

The styrene-acrylonitrile copolymer resin is a polymer added to improve the compatibility between the rubber-modified styrene resin (A) and the polyphenylene ether resin (B) used as the base resin. Among the components (C) used in the present invention, the content of styrene except for the rubber part is 82 to 95% by weight and the content of acrylonitrile is 5 to 18% by weight. The polymerization method of the styrene-acrylonitrile copolymer may be prepared by applying emulsification, suspension, bulk polymerization, etc., and a suitable weight average molecular weight is 50,000 to 200,000.

Further monomers copolymerizable with the styrene-acrylonitrile include methacrylate or phenylmaleimide, and styrene may be replaced with α-methyl styrene to improve heat resistance.

The amount of the styrene-acrylonitrile copolymer is added in order to improve the compatibility of the blend of the rubber-modified styrene resin (A) and the polyphenylene ether resin, and the base resin (A) + (B) 100 weight It can be applied in the range of 2 to 30 parts by weight relative to the part.

If the styrene-acrylonitrile copolymer is not added, the compatibility of the rubber-modified styrene-based resin with the blend of polyphenylene ether resin cannot be improved, and thus the mechanical strength is drastically lowered, so that practical application of the product is difficult.

(D) polystyrene or rubber-reinforced polystyrene resin

Polystyrene or rubber-reinforced polystyrene resin (D) can be prepared using conventional bulk polymerization, suspension polymerization, emulsion polymerization or a mixture thereof. The resin may be selected from the group consisting of butadiene-type rubbers, isoprene-type rubbers, copolymers of butadiene and styrene, alkyl acrylate rubbers, and the like. The resin may be prepared by adding to 100 parts by weight and thermally polymerizing in the presence of benzoyl peroxide, t-butyl hydroperoxide, acetyl peroxide, cumene hydroperoxide, or the like without an initiator. The resin (D) may be used alone or mixed with each other, a polystyrene resin and a rubber-reinforced polystyrene resin having no rubber content.

The polystyrene or rubber-reinforced polystyrene resin (D) may be applied 5 to 50 parts by weight based on 100 parts by weight of the base resin (A) + (B).

(E) Phosphate Ester Compound

Phosphate esters that can be used in the present invention are compounds having the following structural formula (1):

(Formula 1)

In the above structural formula (1) of R _1, R ₂ and R ₃ are independently hydrogen or an alkyl group of C ₁ ~C ₄ to each other, X is a C ₆ ~C ₂₀ aryl group or a substituted C ₆ ~C ₂₀ alkyl group As an aryl group, it is derived from dialcohols, such as resorcinol, hydroquinol, bisphenol-A, bisphenol-S, and the value of N is 0-4.

When N is 0, the compound corresponding to Structural Formula (1) is triphenyl phosphate, tricresyl phosphate, trigyrenyl phosphate, tri (2,6-dimethylphenyl) phosphate, and tri (2,4,6-tri Methylphenyl) phosphate, tri (2,4-dibutylbutylphenyl) phosphate, tri (2,6-dibutylbutylphenyl) phosphate, and the like, when N is 1, resorcinolbis (diphenyl) phosphate, res Sosinolbis (2,6-dimethylphenyl) phosphate, Resorcinolbis (2,4-dibutylbutylphenyl) phosphate, Hydroquinolbis (2,6-dimethylphenyl) phosphate, Hydroquinolbis (2,4- Dietary butylphenyl) phosphate and the like. In addition, the phosphate ester compound (E) may be applied to each independently or in a mixture.

The said phosphate ester compound (E) comprises 5-30 weight part with respect to 100 weight part of base resins (A) + (B).

(F) phosphonate compounds

Phosphonate-based compounds that can be used in the present invention have the following structural formula (2):

(Formula 2)

In formula (2), R ₁ and R ₂ are each independently an alkyl group or an aryl group of C ₄ to C ₁₂ , and C ₈ H ₁₉ is a representative compound thereof.

The phosphonate compound (F) is used in an amount of 0.01 to 20 parts by weight based on 100 parts by weight of the base resin (A) + (B).

In the method for producing the thermoplastic resin composition of the present invention, an antidripping agent, an impact modifier, an inorganic additive, a heat stabilizer, an antioxidant, a light stabilizer, a pigment, and a dye may be added according to each use. The inorganic additives added may include asbestos, glass fibers, talc, ceramics, sulfates, and the like, which may be used within a range of 50 parts by weight based on 100 parts by weight of the base resin (A) + (B) of the present invention.

The invention can be better understood by the following examples, which are intended for purposes of illustration of the invention and are not intended to suggest protection scope defined by the appended claims.

Example

(A) rubber modified styrene resins, (B) polyphenylene ether resins, and (C) styrene-acrylonitrile having an acrylonitrile content of 5 to 18% by weight, used in the resin compositions of the following Examples and Comparative Examples. Preparation and specification of a nitrile copolymer, (D) polystyrene or rubber reinforced polystyrene resin, (E) phosphate ester type compound, and (F) phosphonate type compound are as follows.

(A) Rubber modified styrene resin

The rubber-modified styrene-based resin is prepared by mixing the styrene-acrylonitrile-containing graft copolymer resin (a ₁ ) and the styrene-acrylonitrile-containing copolymer resin (a ₂ ) prepared in the following Table 1 contents. It became.

(a ₁ ) Styrene-acrylonitrile-containing graft copolymer resin

36 parts by weight of styrene, 14 parts by weight of acrylonitrile and 150 parts by weight of deionized water are added to 50 parts by weight of butadiene rubber latex, 1.0 part by weight of potassium oleate, 0.4 part by weight of cumene hydroperoxide, 0.2 parts by weight of mercaptan-based chain transfer agent, 0.4 parts by weight of glucose, 0.01 parts by weight of iron sulfate hydrate, and 0.3 parts by weight of sodium pyrophosphate sodium salt were maintained at 75 ° C. for 5 hours, and the reaction was completed to prepare graft ABS latex. To the solid content of the resin, sulfuric acid was added to 0.4 part by weight and coagulated to prepare a styrene-acrylonitrile-containing graft copolymer resin (g-ABS) powder.

(a ₂ ) Styrene-acrylonitrile-containing copolymer resin (AN content 25%)

To 75 parts by weight of styrene and 25 parts by weight of acrylonitrile, 120 parts by weight of deionized water, 0.15 parts by weight of azobisisobutyronitrile, 0.4 parts by weight of tricalcium phosphate, and 0.2 parts by weight of mercaptan-based chain transfer agent were added, and the mixture was cooled to room temperature to 80 ° C. The copolymer resin (SAN) having an acrylonitrile content of 25% by weight was prepared by increasing the temperature for 90 minutes and maintaining the temperature for 180 minutes. It was washed with water, dehydrated and dried to prepare a SAN powder. The weight average molecular weight of the synthesized styrene-acrylonitrile-containing copolymer resin was about 160,000 to 200,000.

(B) polyphenylene ether resin (PPE resin)

Poly (2,6-dimethyl-1,4-phenylene) ether (trade name P-402) from Asahi Kasei of Japan was used, and the particle size was in the form of a powder having an average particle diameter of several μm.

(C) Styrene-acrylonitrile copolymer resin (AN content 13% SAN)

Styrene is 87 parts by weight acrylonitrile is 13 parts by weight, 120 parts by weight of deionized water, 0.1 part by weight of azobisisobutyronitrile and 1,1'-di (tertiarybutylperoxy) -3,3 ', 5- 0.2 parts by weight of trimethylcyclohexane, 0.4 part of tricalcium phosphate and 0.2 part of mercaptan-based chain transfer agent were added, and the temperature was raised from room temperature to 80 ° C. for 90 minutes, maintained at this temperature for 150 minutes, and then heated up to 95 ° C. and maintained for 120 minutes. A copolymer resin (SAN) having an acrylonitrile content of 13% was prepared. It is washed with water, dehydrated and dried to prepare a SAN powder. The weight average molecular weight of the synthesized styrene-acrylonitrile-containing copolymer resin was about 100,000 to 140,000.

(D) polystyrene or rubber-reinforced polystyrene resin

(d ₁ ) Polystyrene (GPPS)

 Cheil Industries Co., Ltd. GPPS [brand name HF-2680] was used.

(d ₂ ) Rubber reinforced styrene resin (HIPS)

 Cheil Industries Co., Ltd., a rubber-reinforced styrene resin (trade name HG-1760S) was used.

(E) Phosphate Ester Compound

Triphenyl phosphate having a melting point of 48 ° C. was used.

(F) phosphonate compounds

Dioctylphosphonate was used as a liquid material at room temperature.

Each of the components was prepared in the resin composition of Examples 1 to 3 and Comparative Example 1 in the composition shown in Table 1.

Item Comparative Example 1 Example 1 Example 2 Example 3 Ingredients (parts by weight) (A) (a ₁ ) 38 38 38 38 (a ₂ ) 24 24 24 24 (B) 38 38 38 38 (C) 10 10 10 10 (D) (d ₁ ) 20 20 - 10 (d ₂ ) - - 20 10 (E) 17 11 11 11 (F) - 6 6 6

The resin compositions of Examples 1 to 3 and Comparative Example 1 were added in the amounts shown in Table 1 and extruded in a conventional twin screw extruder in the range of 200 to 280 ° C. to prepare pellets.

The prepared pellets were dried at 80 ° C. for 3 hours, and then injected into a 6 Oz injection machine under conditions of a molding temperature of 220 to 280 ° C. and a mold temperature of 40 to 80 ° C. to prepare a physical specimen. The prepared specimens were measured for Izod impact strength (1/8 "notch, kgf · cm / cm) in accordance with ASTM D-256, and the bucket softening temperature at 1 kg load was measured in accordance with ASTM D-1525. The melt flow index (g / 10 min) was measured at 10 ° C. and 220 kg by ASTM D-1238, and the flame retardancy was measured according to the UL 94 VB flame retardancy standard. 120mm × 180mm × 3mm sized plate specimen with 25mm RIB of 1mm thickness 20mm away from mold gate under conditions of molding temperature 220 ~ 280 ℃ and mold temperature 40 ~ 80 ℃ in injection machine Appearance is the incidence rate of defective products that cannot be used normally due to flow marks and black lines by injecting the back of a 15 inch monitor at a molding temperature of 210 to 270 ℃ and a mold temperature of 50 to 80 ℃ in an 850 ton injection machine. In addition, the thermal stability is 10 Oz injection The dichroism of the molded articles of 100 mm × 130 mm × 3 mm size after injection for 30 minutes at the molding temperature of 210 to 270 ° C. and the mold temperature of 40 to 80 ° C. was expressed as the difference from the standard chromaticity of each pellet. Physical property measurement results are shown in Table 2 below.

Item Comparative Example 1 Example 1 Example 2 Example 3 Properties Izod impact strength (1/8 '' notch, kgfcm / cm) (ASTM D-256) 28 30 29 28 VST (ASTM D-1525) 96 95 96 94 Melt Flow Index (g / 10min) (ASTM D-1238) 35 34 36 36 Flame retardant (1/10 '', UL 94 VB) V-1 V-1 V-1 V-1 RIB strength 33 48 44 46 Exterior(%) 3% 1.6% 1.2% 1.5% Thermal Stability (ΔE) 3.7 1.5 2.0 1.7

In Comparative Example 1, a polystyrene resin (d ₁ ) was applied, and a phosphonate compound (F) was not applied, and in Examples 1 to 3, all of the phosphonate compound (F) was added. Polystyrene resin (d ₁ ) was applied, and in Example 2, rubber-reinforced polystyrene resin (d ₂ ) was applied, and in Example 3, polystyrene resin and rubber-reinforced polystyrene resin were used together.

Looking at the measurement results of the physical properties of Table 2, it can be seen that compared to Comparative Example 1 without the phosphonate-based compound (F), RIB strength and appearance is significantly improved in Examples 1 to 3 to which the compound is applied. The thermal stability is also excellent. In particular, in the case of Example 1 to which polystyrene (d ₁ ) was applied, the thermal stability was good, and in Example 2 to which rubber-reinforced polystyrene resin (d ₂ ) was applied, the appearance was further improved. In the case of Example 3 in which the polystyrene and the rubber-reinforced polystyrene resin were applied together, the RIB strength, appearance, and thermal stability were all good. As can be seen from the measurement results of the physical properties of Comparative Example 1 of Table 2, when the phosphonate-based compound is not applied, it can be confirmed that RIB strength, appearance, and thermal stability are significantly low.

The thermoplastic resin composition of the present invention improves compatibility by adding a styrene-acrylonitrile copolymer having an acrylonitrile content of 5 to 18% by weight to a rubber-modified styrene resin and a polyphenylene ether resin. A polystyrene or rubber-reinforced polystyrene resin is added, and a phosphate ester compound is applied to improve flame retardancy, and in particular, a phosphonate-based flame retardant is added to have an RIB strength, appearance, and thermal stability.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (8)

(A) (a ₁₎ excluding the rubber portion and the styrene-containing graft copolymer resin 20-100% by weight of the amount of acrylonitrile 18-50% by weight, and (a ₂₎ is an acrylonitrile content of 18-50% by weight 40 to 95 parts by weight of a rubber-modified styrene resin composed of 0 to 80% by weight of phosphorus styrene-containing copolymer resin; (B) 5 to 60 parts by weight of polyphenylene ether resin; (C) 2 to 30 parts by weight of a styrene-acrylonitrile copolymer resin having an acrylonitrile content of 5 to 18% by weight based on 100 parts by weight of (A) + (B); (D) 5 to 50 parts by weight of polystyrene or rubber-reinforced polystyrene resin based on 100 parts by weight of (A) + (B); (E) 5 to 30 parts by weight of the phosphate ester compound based on 100 parts by weight of the above (A) + (B); And (F) 0.01 to 20 parts by weight of the phosphonate compound based on 100 parts by weight of the above (A) + (B); A thermoplastic resin composition, characterized in that consisting of. The thermoplastic resin composition according to claim 1, wherein the content of rubber in the components of the styrene-containing graft copolymer resin (a ₁ ) is 10 to 60 wt% based on the graft copolymer resin. According to claim 1, The styrene-containing graft copolymer resin (a ₁ ) is a monomer selected from acrylic acid, methacrylic acid, maleic anhydride and N- substituted maleimide 40 wt% or less with respect to the styrene-containing graft copolymer resin The styrene-containing copolymer resin (a ₂ ) is prepared by adding a monomer selected from acrylic acid, methacrylic acid, maleic anhydride and N-substituted maleimide to 40% by weight or less with respect to the styrene-containing copolymer resin. Thermoplastic resin composition characterized in that it is prepared. The thermoplastic resin composition according to claim 1, wherein the styrene-acrylonitrile copolymer resin (C) is further copolymerized with methacrylate or phenylmaleimide. The thermoplastic resin composition of claim 1, wherein the phosphate ester compound (E) has the following formula: Wherein R ₁ , R ₂ and R ₃ are each independently hydrogen or an alkyl group of C _{1 to} C ₄ ; X is a C ₆ -C ₂₀ aryl group substituted with a C ₆ -C ₂₀ aryl group or an alkyl group and is derived from a dialcohol of resorcinol, hydroquinol, bisphenol-A, or bisphenol-S; And the value N ranges from 0 to 4. The thermoplastic resin composition according to claim 5, wherein the phosphate ester compound (E) is at least two or more phosphate ester compounds having different values of N. The thermoplastic resin composition according to claim 1, wherein the phosphonate compound (F) has the following structural formula: Wherein R ₁ and R ₂ are each independently a C ₄ to C ₁₂ alkyl or aryl group. The thermoplastic resin composition of claim 1, further comprising an dripping inhibitor, an impact modifier, an inorganic additive, a heat stabilizer, an antioxidant, a light stabilizer, a pigment, and / or a dye.