KR101134014B1 - Flame Retardant Thermoplastic Resin Composition Having Good Scratch Resistance and Impact Strength - Google Patents

Abstract

The thermoplastic resin composition according to the present invention comprises (A) 35 to 90% by weight of polycarbonate resin, (B) 5 to 60% by weight of (meth) acrylate resin, and (C) aromatic vinyl-vinyl cyanide copolymer resin 1 to 1 100 parts by weight of the base resin consisting of 40% by weight, (D) 1 to 50 parts by weight of the flame retardant and (E) 1 to 30 parts by weight of the impact modifier. The thermoplastic resin composition is excellent in scratch resistance and impact strength, and has a high flame retardancy.

Polycarbonate resin, (meth) acrylate resin, aromatic vinyl-vinyl cyanide copolymer resin, impact strength, scratch resistance, flame resistance

Description

Flame Retardant Thermoplastic Resin Composition Having Good Scratch Resistance and Impact Strength}

Field of invention

The present invention relates to a flame retardant thermoplastic resin composition excellent in scratch resistance and impact strength. More specifically, the present invention, by applying the aromatic vinyl-vinyl cyanide copolymer resin to the blend of polycarbonate resin and (meth) acrylate resin, exhibits excellent impact strength while low addition amount of the impact modifier, scratch resistance The present invention relates to a thermoplastic resin composition having excellent properties and flame retardancy.

Background of the Invention

As electric and electronic products become larger, more specialized, and lighter, various characteristics are required for the resins used to manufacture them. In particular, as the exterior performance of exterior materials is more important, the demand for high gloss materials is increasing, and the scratch resistance of the resin itself is evaluated as an important performance. In addition, as the safety of fire has recently emerged as an important issue, the demand for flame retardant resins is also increasing.

As a method that can be used to achieve scratch resistance and flame resistance at the same time, polycarbonate (PC) resin and (meth) acrylate-based resin, preferably polycarbonate resin and polymethyl methacrylate (PMMA) resin alloy).

Polycarbonate resins have excellent mechanical strength, have excellent transparency, thermal stability, self-extinguishing ability, dimensional stability, etc. and are widely used in electric and electronic products and automobile parts. In addition, since the polycarbonate resin is easy to achieve flame retardancy in chemical structure, it is possible to achieve excellent flame retardancy even with a small amount of flame retardant compared to general-purpose polymers. However, since the scratch resistance of the polycarbonate resin itself is not good in and around the pencil hardness B, it is difficult to achieve good scratch resistance with only polycarbonate resin.

On the other hand, in the case of (meth) acrylate-based resins such as PMMA resin, the scratch resistance is very good as the pencil hardness of about 3H, but has a disadvantage that it is very difficult to achieve flame retardancy with conventional flame retardants. Therefore, when blending the polycarbonate resin and the (meth) acrylate-based resin (blend), it is possible to complementally improve the scratch resistance and flame retardant characteristics, which are disadvantages of each.

However, since there is no compatibility between the polycarbonate resin and the (meth) acrylate resin, there is a disadvantage in that they are separated into their respective phases even by melt kneading at a high temperature. In addition, in the blend of the polycarbonate resin and the (meth) acrylate-based resin, a problem that the impact strength is greatly reduced due to the use of the (meth) acrylate-based resin occurs. In order to solve this problem, it is possible to increase the impact strength by using an impact modifier, but there is a disadvantage in that the scratch resistance according to the use of the impact modifier is inferior.

In order to solve the above problems, the present inventors apply an aromatic vinyl-vinyl cyanide copolymer resin to a blend of a polycarbonate resin and a (meth) acrylate resin, thereby providing excellent impact resistance even when the content of the impact modifier is low. The present inventors have developed a thermoplastic resin composition exhibiting excellent scratch resistance and flame retardancy.

An object of the present invention is to provide a thermoplastic resin composition excellent in both flame retardancy and scratch resistance.

Another object of the present invention is to apply an aromatic vinyl-vinyl cyanide copolymer resin to a blend of a polycarbonate resin and a (meth) acrylate-based resin, thereby improving the impact strength without deteriorating the scratch resistance. It is to provide.

Still another object of the present invention is to provide a flame retardant thermoplastic resin composition having low impact reinforcing agent content while exhibiting high impact resistance and excellent flame resistance and scratch resistance.

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

Summary of the Invention

The present invention provides a thermoplastic resin composition having excellent impact strength even when the content of the impact modifier is low, preventing the deterioration of scratch resistance, and having excellent flame resistance, and a plastic molded article made of the thermoplastic resin composition.

The thermoplastic resin composition according to the present invention comprises (A) 35 to 90% by weight of polycarbonate resin, (B) 5 to 60% by weight of (meth) acrylate resin, and (C) aromatic vinyl-vinyl cyanide copolymer resin 1 to 1 100 parts by weight of the base resin consisting of 40% by weight, (D) 1 to 50 parts by weight of the flame retardant and (E) 1 to 30 parts by weight of the impact modifier.

In an embodiment of the present invention, the content of the impact modifier (E) is preferably 1 to 10 parts by weight.

In an embodiment of the present invention, the (meth) acrylate-based resin (B) is preferably a polymer of 50 to 100% by weight of alkyl methacrylate having 1 to 4 carbon atoms and 0 to 50% by weight of a monomer copolymerizable therewith.

In an embodiment of the present invention, the aromatic vinyl-vinyl cyanide copolymer resin (C) preferably comprises 50 to 95% by weight of an aromatic vinyl monomer and 5 to 50% by weight of a vinyl cyanide monomer.

In an embodiment of the present invention, the flame retardant (D) is preferably a phosphorus flame retardant, halogen flame retardant or a mixture thereof.

In an embodiment of the present invention, the impact modifier (E) is preferably a rubber modified graft copolymer or an olefin copolymer.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Detailed Description of the Invention

(A) polycarbonate resin

In the thermoplastic resin composition according to the present invention, a polycarbonate resin prepared by a method known to those skilled in the art or a commercially available polycarbonate resin, preferably an aromatic polycarbonate may be used without limitation.

For example, the polycarbonate resin may be prepared by reacting a diphenol compound represented by Formula 1 with phosgene, halogen formate, or carbonic acid diester.

[Formula 1]

Wherein A represents a single bond, C ₁ -C ₅ alkylene, C ₁ -C ₅ alkylidene, C ₅ -C ₆ cycloalkylidene, -S- or -SO _2- .

Specific examples of the diphenol compound represented by Formula 1 include 4,4'-dihydroxydiphenyl, 2,2-bis- (4-hydroxyphenyl) -propane, 2,4-bis- (4-hydroxy Hydroxyphenyl) -2-methylbutane, 1,1-bis- (4-hydroxyphenyl) -cyclohexane, 2,2-bis- (3-chloro-4-hydroxyphenyl) -propane, 2,2- Bis- (3,5-dichloro-4-hydroxyphenyl) -propane; and the like, but are not necessarily limited thereto. In addition, as the diphenol compound, compounds such as hydroquinone and resorcinol may be used. Among them, 2,2-bis- (4-hydroxyphenyl) -propane, 2,2-bis- (3,5-dichloro-4-hydroxyphenyl) -propane or 1,1-bis- (4- Bisphenols, such as hydroxyphenyl) -cyclohexane, are preferable, and 2, 2-bis- (4-hydroxyphenyl) propane also called bisphenol-A is more preferable. The weight average molecular weight of the polycarbonate resin used in the present invention (M _w) is preferably 10,000 to 200,000, more preferably 15,000 to 80,000.

As the polycarbonate resin, a linear polycarbonate resin, a branched polycarbonate resin, or a mixture of linear and branched polycarbonate resins may be used without limitation.

Bisphenol A-based polycarbonate resin may be used as the linear polycarbonate resin, but is not necessarily limited thereto. The branched polycarbonate resin preferably contains 0.05 to 2 mol% of tri- or more polyfunctional compounds, such as compounds having trivalent or more phenol groups, based on the total amount of the diphenol compounds used for the polymerization. It can be prepared by addition.

In an embodiment of the present invention, the polycarbonate resin (A) together with the (meth) acrylate resin (B) and the aromatic vinyl-vinyl cyanide copolymer resin (C) constitute a base resin, the entire base resin It is used in the range of 35 to 90% by weight, preferably 45 to 85% by weight, more preferably 50 to 75% by weight based on the weight. Since the polycarbonate resin (A) facilitates imparting flame retardancy, when applied at less than 35% by weight, flame retardancy and mechanical strength decrease, and when applied at more than 90% by weight, scratch resistance is improved. It's hard to expect

(B) (meth) acrylate type resin

The (meth) acrylate resin used in the present invention is a homopolymer or copolymer of alkyl (meth) acrylate, preferably a homopolymer or copolymer of alkyl methacrylate having 1 to 4 carbon atoms.

Specifically, the (meth) acrylate resin is a polymer of 50 to 100% by weight of alkyl methacrylate having 1 to 4 carbon atoms and 0 to 50% by weight of a monomer copolymerizable therewith. When the content of the alkyl methacrylate having 1 to 4 carbon atoms is less than 50% by weight, the transparency and mechanical strength of the polymerized (meth) acrylate resin may be lowered, which is not preferable.

The alkyl methacrylate having 1 to 4 carbon atoms is an alkyl methacrylate in which the alkyl group contains 1 to 4 carbon atoms, for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, iso-propyl Methacrylate, n-butyl methacrylate, and the like. Of these, methyl methacrylate (MMA) is most preferred.

The monomer copolymerizable with the alkyl methacrylate having 1 to 4 carbon atoms is not particularly limited, and preferably a single functional unsaturated monomer is used. Methacrylate monomers including, for example, ethyl methacrylate, propyl methacrylate, butyl methacrylate, benzyl methacrylate, phenyl methacrylate and glycidyl methacrylate; Acrylate monomers including methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate and 2-ethylhexyl acrylate; Unsaturated carboxylic acids including acrylic acid and methacrylic acid; Acid anhydrides including maleic anhydride; Nitrile monomers including acrylonitrile and methacrylonitrile; Styrene-based monomers including styrene and α-methylstyrene may be used, and these may be applied alone or in mixture of two or more thereof.

In the preparation of the (meth) acrylate-based resin, chain transfer agents and antioxidants may be used to control molecular weight and thermal stability, and the amount of each used varies depending on the type, but is 0.02 based on 100 parts by weight of the total monomers. To 10 parts by weight is preferred.

The polymerization method of the said (meth) acrylate type resin is not specifically limited. For example, it can be prepared according to the bulk polymerization, emulsion polymerization, suspension polymerization method, it can be easily carried out by those of ordinary skill in the art.

The (meth) acrylate resin (B) is used in 5 to 60% by weight, preferably 10 to 50% by weight, more preferably 15 to 40% by weight based on the total weight of the base resin. When the content of the (meth) acrylate resin is less than 5% by weight, it is difficult to impart scratch resistance, and when it exceeds 60% by weight, the flame retardancy is very low, and it is particularly difficult to achieve flame retardancy with a phosphorus flame retardant. .

(C) Aromatic vinyl-vinyl cyanide copolymer resin

In the thermoplastic resin composition according to the present invention, the (meth) acrylate-based resin (B) constituting a part of the base resin is excellent in scratch resistance but has a disadvantage of low impact strength. In order to prevent such a drop in impact strength, a method of adding an impact modifier to a resin composition is generally used.

However, impact modifiers reduce flame retardancy It causes side effects that lower the inherent scratch resistance of the resin composition. Therefore, it is preferable to use a small amount of impact modifier as much as possible. Especially in the case of a resin composition applied as an exterior material of electrical and electronic products where scratch resistance is important, it is important to reduce the addition amount of the impact modifier as much as possible.

In order to solve this problem, the present invention uses an aromatic vinyl-vinyl cyanide copolymer resin. The aromatic vinyl-vinyl cyanide copolymer resin has excellent compatibility with blends of polycarbonate resins and (meth) acrylate resins compared to impact modifiers, and can improve the impact strength that is insufficient without degrading scratch resistance. have. Accordingly, the resin composition of the present invention to which the aromatic vinyl-vinyl cyanide copolymer resin is added exhibits excellent impact resistance even when the content of the impact modifier is low, and does not reduce scratch resistance.

The aromatic vinyl cyanide copolymer used in the present invention is prepared by copolymerizing an aromatic vinyl monomer and a vinyl cyanide monomer. At this time, it may be prepared by copolymerizing together with the addition of a monomer that selectively gives properties such as workability and heat resistance.

Examples of the aromatic vinyl monomers include styrene, α-methylstyrene, β-methyl styrene, p-methyl styrene, para t-butyl styrene, ethyl styrene, vinyl xylene, monochlorostyrene, dichlorostyrene, dibromostyrene, and vinyl naphthalene. And the like, but are not necessarily limited thereto. These can be used individually or in mixture of 2 or more types. Of these, styrene is most preferred. The content of the aromatic vinyl monomer is preferably 50 to 95% by weight of the total weight of the aromatic vinyl-vinyl cyanide copolymer resin (C).

As the vinyl cyanide monomer, acrylonitrile, methacrylonitrile, ethacrylonitrile, or the like may be used, but is not necessarily limited thereto. These can be used individually or in mixture of 2 or more types. The vinyl cyanide monomer is preferably used at 5 to 50% by weight of the total weight of the aromatic vinyl-vinyl cyanide copolymer resin (C).

Examples of the monomer for imparting properties such as processability and heat resistance include acrylic acid, methacrylic acid, maleic anhydride, N-substituted maleade, and mixtures thereof, but are not necessarily limited thereto. The monomer is preferably used in 0 to 30% by weight of the total weight of the aromatic vinyl cyanide vinyl copolymer resin (C).

In an embodiment of the present invention, the aromatic vinyl-vinyl cyanide copolymer resin (C) is 1 to 40% by weight, preferably 1 to 20% by weight, more preferably 3 to 15% based on the total weight of the base resin. Used in weight percent.

When the content of the aromatic vinyl-vinyl cyanide copolymer resin is less than 1% by weight, it is difficult to reduce the amount of impact modifier due to a slight increase in impact resistance, and when it exceeds 40% by weight, scratch resistance may be deteriorated. not. In particular, when the aromatic vinyl cyanide copolymer resin (C) is used in an amount of 1 to 20% by weight, excellent scratch resistance, impact strength, and fluidity can be obtained.

(D) flame retardant

The flame retardant used in the present invention is not particularly limited. Preferably, a phosphorus flame retardant, a halogen flame retardant or a mixture thereof may be applied, and it is more preferable to use a double phosphorus flame retardant.

The phosphorus-based flame retardant means a flame retardant containing a common phosphorus, for example, phosphate, phosphonate, phosphonate, phosphinate, phosphine oxide (Phosphine Oxide), phosphazene (Phosphazene) and metal salts thereof may be applied, but are not necessarily limited thereto.

As the halogen-based flame retardant, a halogen-based compound which may serve as a flame retardant may be used without limitation. For example, decabromo diphenyl ether, decabromo diphenyl ethane, tetrabromo bisphenol-A, tetrabromo bisphenol-A epoxy oligomer, octabromo trimethylphenyl indane, ethylene-bis-tetrabromophthalimide And halogen-based flame retardants such as tris (tribromophenol) triazine and polystyrene bromide can be used. In particular, the halogen-based flame retardant is preferably a halogen-based compound capable of melting at a normal processing temperature, more specifically a halogen-based compound having a melting point or softening point at 250 ° C or lower.

The flame retardant (D) is used in 1 to 50 parts by weight, preferably 5 to 30 parts by weight, more preferably 10 to 25 parts by weight based on 100 parts by weight of the base resin. When the content of the flame retardant is less than 1 part by weight, it is difficult to obtain a flame retardant effect, and when it exceeds 50 parts by weight, physical properties such as impact strength may be significantly reduced.

(F) impact modifier

In the thermoplastic resin composition according to the present invention, the aromatic vinyl-vinyl cyanide copolymer resin (C) improves the impact strength, but by itself it is difficult to achieve a high level of impact resistance. Therefore, the resin composition of the present invention further includes an impact modifier to further improve impact resistance. However, the resin composition of the present invention exhibits high impact resistance while having a lower content of the impact modifier than a conventional resin composition, and prevents scratch resistance from deteriorating as the amount of the impact modifier is reduced.

In an embodiment of the present invention, the impact modifier is 1 to 30 parts by weight, preferably 1 to 20 parts by weight, more preferably 1 to 10 parts by weight, even more preferably 1 to 1 part by weight based on 100 parts by weight of the base resin. 7 parts by weight is used. When the impact modifier is used in less than 1 part by weight, the effect of impact reinforcement is lowered, and when used in excess of 30 parts by weight, scratch resistance And flame retardancy may be lowered. In particular, the resin composition of the present invention exhibits excellent impact strength and scratch resistance even if the content of the impact modifier does not exceed 10 parts by weight.

As the impact modifier, a rubber modified graft copolymer or an olefin copolymer may be used.

The rubber modified graft copolymer may be prepared by graft polymerization of a graft copolymerizable monomer in a rubbery polymer, and the rubber content of the rubber modified graft copolymer is preferably 20 to 80 wt%.

The rubbery polymer may be at least one selected from the group consisting of diene rubber, acrylate rubber and silicone rubber. Specifically, butadiene is used as the typical monomer in the diene rubber, isoprene may be applied. As the acrylate rubber, monomers such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, hexyl methacrylate and 2-ethylhexyl methacrylate are used. do. The silicone rubber may be prepared from cyclosiloxane, and examples of the cyclosiloxane include hexamethyl cyclotrisiloxane, octamethyl cyclotetrasiloxane, decamethyl cyclopentasiloxane, dodecamethyl cyclohexasiloxane, trimethyltriphenyl cyclotrisiloxane, Tetramethyltetraphenyl cyclotetrosiloxane, octaphenyl cyclotetrasiloxane, mixtures thereof, and the like. In addition, polyolefin type rubbers, such as ethylene / propylene rubber and ethylene-propylene-diene terpolymer (EPDM), can be used.

Examples of the monomer capable of graft copolymerization with the rubbery polymer include styrene monomers including styrene, α-methylstyrene, and alkyl-substituted styrene; Nitrile monomers including acrylonitrile and methacrylonitrile; (Meth) acrylate monomers including methyl methacrylate and methyl acrylate; Acid anhydrides including maleic anhydride; Alkyl or phenyl nucleosubstituted maleimide and the like can be used, but are not necessarily limited thereto. These may be used alone or in mixture of two or more.

In an embodiment of the present invention, the thermoplastic resin composition may further include an additive according to each use. As the additive, an antidripping agent such as polytetrafluoroethylene, an antioxidant, a plasticizer, a heat stabilizer, a light stabilizer, a compatibilizer, a weather stabilizer, a pigment, a dye, an inorganic additive, and the like may be used, but are not necessarily limited thereto. These can be used individually or in mixture of 2 or more types. The additive is used in 30 parts by weight or less, preferably 0.0001 to 30 parts by weight based on 100 parts by weight of the base resin.

The thermoplastic resin composition according to the present invention can be produced by a known method for producing a resin composition. For example, the components of the present invention and other additives may be mixed at the same time and then melt-extruded in an extruder to produce pellets or chips.

Since the thermoplastic resin composition of the present invention has high impact strength and does not deteriorate scratch resistance and has excellent flame retardancy, it can be used for molding various products. In particular, electric and electronic devices such as TVs, audio, mobile phones, digital cameras, navigation, washing machines, computers, monitors, MP3s, video players, CD players, washing machines, and office automation equipment that require high flame resistance, scratch resistance, and impact resistance It can be widely used for manufacturing the housing.

There is no particular limitation on the method of molding the plastic molded article using the thermoplastic resin composition according to the present invention. For example, an extrusion, injection, or casting molding method may be applied. The molding can be easily carried out by those skilled in the art.

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

Example

The specifications of each component used in the following Examples and Comparative Examples are as follows.

(A) polycarbonate resin

Panlite L-1225 Grade from Teijin, Japan, was used.

(B) (meth) acrylate type resin

IH830 Grade, a polymethylmethacrylate resin manufactured by LG MMA, was used.

(C) Aromatic vinyl-vinyl cyanide copolymer resin

HR-5330 Grade, a styrene-acrylonitrile copolymer resin (SAN) manufactured by Cheil Industries, was used.

(D) flame retardant

As the phosphorus flame retardant, CR-741, a bisphenol A diphosphate manufactured by Daihachi Chemical, Japan, was used.

(E) Impact modifier

Metablen C223-A Grade, a methyl methacrylate-butadiene-ethyl acrylate copolymer manufactured by MRC, was used.

(F) polystyrene resin

HF-2660S Grade, a general purpose polystyrene resin (GPPS) manufactured by Cheil Industries, was used.

(G) anti-drip agent (PTFE: Polytetrafluoroethylene)

Teflon (trade name) 7AJ of Dupont, USA was used.

Examples 1-2 and Comparative Examples 1-5

After mixing the components in the content as shown in Table 1 below, by extrusion in a temperature range of 220 ~ 260 ℃ in a conventional twin screw extruder to prepare a pellet. The prepared pellets were dried at 80 ° C. for 3 hours and then injected into an 8 oz injection machine at a molding temperature of 250 ° C. and a mold temperature of 60 ° C. to prepare specimens.

Physical properties of the specimens prepared in Examples and Comparative Examples were evaluated according to the following methods, and the results are shown in Table 1 below.

(1) Izod impact strength: A 1/8 "thick specimen was measured according to ASTM D-256 standard (kgf · cm / cm).

(2) Flame retardant: Flame retardancy was measured according to the UL 94 V flame retardant regulations for 2.0 mm thick specimens.

(3) Pencil hardness: After 10 hours × 10 cm 2 specimen was left for 48 hours at 23 ℃, 50% relative humidity, the pencil hardness was measured according to JIS K 5401. The scratch resistance is evaluated as 3B, 2B, B, HB, F, H, 2H, 3H, etc. according to the pencil hardness result. The higher the H value, the better the scratch resistance. The higher the B value, the lower the scratch resistance. It means to be.

As shown in Table 1, Examples 1 and 2 in which a flame retardant was applied to a base resin consisting of a polycarbonate resin, a (meth) acrylate resin, and an aromatic vinyl-vinyl cyanide copolymer resin were excellent in flame retardancy, In spite of the low content, it shows high impact strength and keeps scratch resistance.

On the other hand, Comparative Examples 1 and 5 having the same composition as Examples 1 and 2, respectively, except that the aromatic vinyl-vinyl cyanide copolymer resin was not applied, were found to have a very low impact strength. It was confirmed that the aromatic vinyl-cyanide copolymer resin improves the impact strength without degrading the scratch resistance.

On the other hand, in the case of Comparative Example 2 in which the content of the impact modifier was increased compared to Comparative Example 1, it was found that the impact strength is improved, but scratch resistance and flame retardancy are significantly reduced. In addition, when increasing the content of the flame retardant (Comparative Example 3), the impact resistance was further lowered.

In addition, in the case of Comparative Example 4 in which the polystyrene resin was applied instead of the aromatic vinyl-vinyl cyanide copolymer resin, it was confirmed that not only the effect of improving the impact strength was small but also the scratch resistance and the flame retardancy were reduced.

The present invention applies an aromatic vinyl-vinyl cyanide copolymer resin to a blend of a polycarbonate resin and a (meth) acrylate-based resin, thereby exhibiting excellent impact resistance with a low addition amount of the impact modifier and reducing the scratch resistance. It has the effect of the invention which prevents and provides the thermoplastic resin composition which has the outstanding flame retardance.

Simple modifications and variations of the present invention can be easily made 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 (10)

Basic resin 100 consisting of 35 to 90% by weight of polycarbonate resin, 5 to 60% by weight of (B) (meth) acrylate resin, and 1 to 40% by weight of (C) aromatic vinyl-vinyl cyanide copolymer resin. Parts by weight; (D) 1 to 50 parts by weight of a flame retardant; And (E) 1 to 30 parts by weight of the impact modifier; Flame retardant thermoplastic resin composition excellent in scratch resistance and impact strength comprising a. The method of claim 1, wherein the impact modifier (E) is a thermoplastic resin composition, characterized in that 1 to 10 parts by weight. The thermoplastic resin according to claim 1, wherein the (meth) acrylate resin (B) is a polymer of 50 to 100% by weight of alkyl methacrylate having 1 to 4 carbon atoms and 0 to 50% by weight of a monomer copolymerizable therewith. Resin composition. 4. The methacrylate monomers according to claim 3, wherein the copolymerizable monomers include ethyl methacrylate, propyl methacrylate, butyl methacrylate, benzyl methacrylate, phenyl methacrylate and glycidyl methacrylate. ; Acrylate monomers including methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate and 2-ethylhexyl acrylate; Unsaturated carboxylic acids including acrylic acid and methacrylic acid; Acid anhydrides including maleic anhydride; Nitrile monomers including acrylonitrile and methacrylonitrile; Styrene monomers including styrene and α-methylstyrene; And mixtures thereof. The thermoplastic resin composition of claim 1, wherein the aromatic vinyl-vinyl cyanide copolymer resin (C) comprises 50 to 95 wt% of an aromatic vinyl monomer and 5 to 50 wt% of a vinyl cyanide monomer. The thermoplastic resin composition of claim 1, wherein the flame retardant (D) is a phosphorus flame retardant, a halogen flame retardant, or a mixture thereof. The thermoplastic resin composition of claim 1, wherein the impact modifier (E) is a rubber-modified graft copolymer or an olefin copolymer. The rubber-modified graft copolymer according to claim 7, wherein the rubber-modified graft copolymer comprises styrene, α-methylstyrene and alkyl-substituted styrene in at least one rubbery polymer selected from the group consisting of diene rubber, acrylate rubber and silicone rubber. Styrene monomers; Nitrile monomers including acrylonitrile and methacrylonitrile; (Meth) acrylate monomers including methyl methacrylate and methyl acrylate; Acid anhydrides including maleic anhydride; A thermoplastic resin composition prepared by graft polymerization of a monomer selected from the group consisting of alkyl or phenyl nucleosubstituted maleimide and mixtures thereof. The method of claim 1, further comprising an additive selected from the group consisting of anti-dripping agents, antioxidants, plasticizers, thermal stabilizers, light stabilizers, compatibilizers, weather stabilizers, pigments, dyes, inorganic additives and mixtures thereof. Thermoplastic resin composition. A plastic molded article molded from the thermoplastic resin composition according to any one of claims 1 to 9.