KR101204883B1 - Polycarbonate Resin Composition with Good warpage and Flame Retardancy - Google Patents

Abstract

The polycarbonate resin composition having excellent bending properties and flame retardancy according to the present invention includes (A) 100 parts by weight of a polycarbonate resin, (B) 1 to 30 parts by weight of a phosphorus-based flame retardant, and (C) a fiber filler having a cross-section ratio of 1.5 or more. 5-100 weight part and 0.05-5 weight part of (D) fluorinated polyolefin resin. The polycarbonate resin composition is not only excellent in bending characteristics and flame retardancy, but also excellent in physical properties such as impact strength, flexural strength, flexural modulus, and heat resistance.

Polycarbonate Resin, Fiber Filler, Cross Section Ratio, Flexural Properties, Heat Resistance

Description

Polycarbonate Resin Composition with Good warpage and Flame Retardancy

Field of invention

The present invention relates to a polycarbonate resin composition excellent in warpage characteristics and flame retardancy. More specifically, the present invention includes a polycarbonate resin, a phosphorus flame retardant and a fiber filler in an appropriate ratio, thereby having excellent bending characteristics and flame retardancy, and not deteriorating mechanical properties and generating no halogen-based harmful gas. It is about.

BACKGROUND OF THE INVENTION

Polycarbonate resin is an engineering plastic with excellent mechanical strength, high heat resistance and transparency, and is used for manufacturing various products such as office automation devices, electrical and electronic products, and building materials.

When reinforcing a filler such as glass fiber in such a polycarbonate resin, while maintaining excellent moldability of the polycarbonate resin, it is possible to improve the tensile strength and flexural strength, particularly exhibits excellent flexural modulus and heat resistance. Therefore, polycarbonate resin reinforced with glass fibers has been used in the production of molded parts such as automobile parts and electrical and electronic products that must be continuously loaded or endure high temperature heat.

However, when the glass fiber is added to most thermoplastic resins, impact resistance is reduced and flame retardancy is lowered compared to before the addition of various problems.

In order to impart flame retardancy to such a resin composition, conventionally, a halogen-based flame retardant and an antimony compound were applied together or a phosphorus-based compound was used. However, when halogen-based flame retardants are used, harmful gases such as hydrogen halides are generated during combustion and processing, and are very harmful to humans. Therefore, the demand for resins containing no halogen-based flame retardants has been rapidly expanded in recent years.

On the other hand, a representative example used as a flame retardant among the phosphorus compounds is a phosphate ester flame retardant. However, in the resin composition using the same, there is a problem in that a so-called "juicing" phenomenon occurs in which the flame retardant moves and deposits on the surface of the molding during molding, and there is also a problem in that the heat resistance of the resin composition is rapidly lowered.

EP 0246620 and 0376616 disclose thermoplastic resin compositions reinforced with glass fibers having a non-circular cross section. However, this composition may have satisfactory strength and toughness, but has a disadvantage in that flame retardancy is reduced.

US Published Patent No. 2007-0149661 discloses a composition consisting of polycarbonate, fiberglass and phosphate based flame retardant. However, since the composition contains a large amount of phosphate ester flame retardant, there is a disadvantage that the degradation of heat resistance, mechanical properties and bending properties are severe.

The present inventors have made efforts to solve the problems of the prior art as a result, by adding a phosphorous flame retardant, a plate-shaped reinforcing fiber and a fluorinated olefin resin in an appropriate ratio, excellent bending properties and flame retardancy, and at the same time mechanical It is to develop a polycarbonate resin composition that does not deteriorate in characteristics and does not generate halogenated harmful gases.

An object of the present invention is to provide a polycarbonate resin composition excellent in bending properties and flame retardancy.

Another object of the present invention is to provide a polycarbonate resin composition having excellent bending properties and flame retardancy, and also excellent physical properties such as impact resistance, heat resistance, and rigidity.

Still another object of the present invention is to provide a polycarbonate resin composition that is excellent in bending characteristics and flame retardancy, and does not discharge harmful halogenated gases harmful to a human body.

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

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 polycarbonate resin composition having excellent bending properties and flame retardancy, excellent physical properties such as impact strength, flexural strength, flexural modulus, and heat resistance, and a plastic molded article molded from the polycarbonate resin composition.

The polycarbonate resin composition according to the present invention includes (A) 100 parts by weight of polycarbonate resin, (B) 1 to 30 parts by weight of a phosphorus flame retardant, (C) 5 to 100 parts by weight of a fiber filler having a width / length ratio of 1.5 or more; (D) 0.05-5 weight part of fluorinated polyolefin resins are included.

In an embodiment of the present invention, the phosphorus flame retardant (C) is preferably a (C ₁ ) cyclic phosphazene oligomeric compound, (C ₂ ) phosphate ester compound or a mixture thereof.

In an embodiment of the present invention, the fiber filler (C) is more preferably a ratio of 2 to 8 of the cross section length / length, glass fibers, carbon fibers, aramid fibers, potassium titanate fibers, silicon carbide fibers and mixtures thereof It may be selected from the group consisting of.

In addition, the plastic molded article molded from the polycarbonate resin composition according to the present invention has a flame retardancy measured by the UL 94 vertical test method at a thickness of 1/16 ″ of V-0 or more, a length of 6 inches in width and length, and a thickness of 1 /. When the three edges of the 16-inch thin-film injection specimen are attached to the ground, the other edge is characterized by having a length of 0.01 to 1.0 mm away from the ground.

Hereinafter, the content of the present invention will be described in detail below.

Detailed Description of the Invention

(A) polycarbonate resin

The polycarbonate resin used in the present invention is not particularly limited, and may be prepared by a method known to those skilled in the art or commercially available polycarbonate resin, preferably aromatic polycarbonate resin. Can be used without limitation.

For example, the polycarbonate resin may be prepared by reacting a diphenol compound represented by the following general formula (I) with phosgene, halogen formate or diester carbonate.

(3)

Wherein A ₁ is a single bond, substituted or unsubstituted alkylene having 1 to 5 carbon atoms, substituted or unsubstituted alkylidene having 1 to 5 carbon atoms, substituted or unsubstituted cycloalkylene having 3 to 6 carbon atoms, substituted Or unsubstituted cycloalkylidene having 5 to 6 carbon atoms, CO, S, and SO ₂ . And R ₁ and R ₂ are each independently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 30 carbon atoms, and substituted or unsubstituted aryl having 6 to 30 carbon atoms, and n ₁ and n ₂ are each independently It is an integer of 0-4. Herein, "substituted" means that a hydrogen atom is a halogen group, alkyl having 1 to 30 carbon atoms, haloalkyl having 1 to 30 carbon atoms, aryl having 6 to 30 carbon atoms, heteroaryl having 6 to 30 carbon atoms, alkoxy having 1 to 20 carbon atoms and these Mean substituted by a substituent selected from the group consisting of a combination of.

Specific examples of the compound represented by Formula 3 include 4,4'-dihydroxydiphenyl, 2,2-bis- (4-hydroxyphenyl) -propane, 2,4-bis- (4-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 etc. are mentioned, It is not necessarily limited to this. 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- Preference is given to using hydroxyphenyl) -cyclohexane, more preferably 2,2-bis- (4-hydroxyphenyl) -propane, also called bisphenol-A. The weight average molecular weight (M _w ) of the polycarbonate resin is preferably 10,000 to 200,000 g / mol, more preferably 15,000 to 80,000 g / mol, but is not necessarily limited thereto.

The polycarbonate resin may be used by mixing not only linear polycarbonate resin but also branched polycarbonate resin or linear and branched polycarbonate resin.

Bisphenol A-based polycarbonate resin may be used as the linear polycarbonate resin, but is not necessarily limited thereto. The branched polycarbonate resin preferably adds 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.

The polycarbonate resin may be a homo polycarbonate resin or a copolycarbonate resin, and a blend form of a copolycarbonate resin and a homo polycarbonate resin may also be used. In addition, the polycarbonate resin may be partially or entirely replaced by an aromatic polyester-carbonate resin obtained by polymerizing in the presence of an ester precursor, such as a bifunctional carboxylic acid.

(B) phosphorus flame retardant

As the phosphorus flame retardant applied to the production of the resin composition according to the present invention, a cyclic phosphazene oligomeric compound (B ₁ ), a phosphate ester compound (B ₂ ) or a mixture thereof may be used.

In an embodiment of the present invention, the phosphorus-based flame retardant (B) is preferably used in an amount of 1 to 30 parts by weight, more preferably 5 to 30 parts by weight, more preferably 5 to 25 parts by weight, based on 100 parts by weight of the polycarbonate resin (A). Even more preferred. When the phosphorus-based flame retardant is used in less than 1 part by weight, flame retardancy may be lowered. When it is used in excess of 30 parts by weight, manufacturing costs may increase, and heat resistance and mechanical properties may be reduced.

(B ₁ ) Cyclic phosphazene oligomeric compound

Cyclic phosphazene oligomeric compound used in the resin composition of the present invention is represented by the structure as shown in the general formula (I), oligomeric compound of the cyclic phosphazene consisting of a linking group (linking group) having -R ₂ -group Or mixtures thereof.

[Formula 1]

Wherein R ₁ is an alkyl group, an aryl group, an alkyl substituted aryl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxyl group, and the alkoxy group or the aryloxy group is substituted with an alkyl group, an aryl group, an amino group or a hydroxyl group, respectively. Can be. k and m are each independently 0 or an integer from 1 to 10. R ₂ is a C ₆ -C ₃₀ dioxyaryl or alkyl substituted C ₆ -C ₃₀ dioxyaryl group derivative. And n is a number average degree of polymerization, the average value of n is 0-3, Preferably it is 0.3-3.

(B ₂ ) phosphate ester compound

The phosphate ester compound used in the present invention is a phosphate ester compound or a mixture of phosphate ester compounds represented by the following formula (2).

[Formula 2]

Wherein R ₃ , R ₄ , R ₆ and R ₇ are each independently a C ₆ to C ₂₀ aryl group or a C ₁ to C ₄ alkyl substituted C ₆ to C ₂₀ aryl group, and R ₅ is C ₆ to C _{It is a 30} aryl group or alkyl-substituted C ₆ ~ C ₃₀ aryl group derivative, L is the number average degree of polymerization, the average value of L is 0-4.

Preferably, R ₃ , R ₄ , R ₆ and R ₇ are phenyl groups, or phenyl groups substituted with alkyl groups such as methyl, ethyl, isopropyl, t-butyl, isobutyl, isoamyl, t-amyl, double phenyl groups or Most preferred are phenyl groups substituted with methyl, ethyl, isopropyl or t-butyl groups.

As the phosphate ester compound, an oligomeric phosphate ester compound derived from a C ₆ to C ₃₀ aryl group or an alkyl substituted C ₆ to C ₃₀ aryl group is preferable. The C ₆ -C ₃₀ aryl group or alkyl substituted C ₆ -C ₃₀ aryl group is preferably derived from resorcinol, hydroquinone, biphenol or bisphenol-A.

That is, the phosphate ester compound (B ₂₎ used in the production of the resin composition of the invention is an aryl phosphate ester induction of the average value of ℓ 0 ~ 4 monomer type or oligomer-type. In an embodiment of the present invention, a phosphate ester compound having an average value of 0, 0, 1, 2, 3 or 4 may be used alone or in a mixed form, in which each component is already mixed when manufactured in a polymerization process. Alternatively, it is also preferable to use a mixture of phosphate ester compounds having different L value prepared separately.

(C) fiber filler

In the present invention, a filler is used to enhance the warpage characteristics, flame retardancy and heat resistance of the resin composition. As the filler, both organic and inorganic fillers may be used. Specific examples of the filler include carbon fiber, glass fiber, aramid, tin potassium carbonate and mixtures thereof, but are not necessarily limited thereto. Among these, glass fiber is preferable.

In an embodiment of the present invention, a plate form specially made of the fiber filler is used. Specifically, as the plate-shaped fiber filler, one having a cross-sectional aspect ratio of 1.5 or more and a length of 2 to 13 mm is used. In this case, the horizontal / vertical ratio of the cross section of the fiber filler having a plate shape is defined as the ratio of the longest diameter (a) and the shortest diameter (length, b) in the cross section of the fiber filler as follows.

* Aspect ratio of cross section = a / b

Conventionally, as a fiber filler for reinforcing thermoplastic resin, it has a predetermined length, for example, 3-6 mm in length, has a circular cross section, and has a horizontal / vertical ratio of about 1, and a diameter of 10 to 20 cross sections. A glass fiber of 탆 was used. However, in the embodiment of the present invention, the warpage characteristics and flame retardancy of the resin composition by using a fiber filler having a cross-sectional ratio of 1.5 or more in cross section, preferably, a plate-shaped fiber filler having a cross-sectional ratio of 2-8 in cross section. , Heat resistance and the like can be improved.

On the other hand, the surface of the fiber filler is preferably used by coating at least one surface improving agent selected from urethane or epoxy in order to increase the surface bonding strength with the thermoplastic resin.

In an embodiment of the present invention, the fiber filler is preferably used in the range of 5 to 100 parts by weight, and more preferably 30 to 90 parts by weight based on 100 parts by weight of the polycarbonate resin (A). When the amount of the fiber filler is less than 5 parts by weight, mechanical stiffness such as bending property and flexural strength may be lowered. When the amount of the fiber filler is more than 100 parts by weight, flame retardancy and impact resistance may be lowered.

(D) fluorinated polyolefin resin

Specific examples of the fluorinated polyolefin resin used in the resin composition of the present invention include polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene / vinylidene fluoride copolymer, tetrafluoroethylene / hexafluoropropylene Copolymers, ethylene / tetrafluoroethylene copolymers, and the like, but are not necessarily limited thereto. These may be used alone or in combination of two or more.

When the fluorinated polyolefin resin is mixed and extruded together with the other constituents of the present invention, a fibrillary network is formed in the resin to lower the melt viscosity of the resin during combustion, and increase the shrinkage rate so that the drop of the resin is increased. Prevent the phenomenon.

The fluorinated polyolefin resin used in the preparation of the resin composition of the present invention can be produced using a known polymerization method. For example, in an aqueous medium containing a free radical forming catalyst such as sodium, potassium or ammonium peroxydi sulfate at a pressure of 7-71 kg / cm 2 and a temperature of 0-200 ° C., preferably 20-100 ° C. Can be prepared.

The fluorinated polyolefin-based resin may be used in an emulsion state or a powder state. When the fluorinated polyolefin-based resin in the emulsion state is used, the dispersibility in the entire resin composition is good, but the manufacturing process is complicated. Therefore, even if it is a powder state, if it can disperse | distribute suitably in the whole resin composition and can form a fibrous network, it is preferable to use in powder state.

Fluorinated polyolefin-based resins which can be preferably used in the preparation of the resin composition of the present invention include polytetrafluoroethylene having a particle size of 0.05 to 1,000 µm and specific gravity of 1.2 to 2.3 g / cm 3.

In an embodiment of the present invention, the content of the fluorinated polyolefin resin is preferably 0.05 to 5 parts by weight based on 100 parts by weight of the polycarbonate resin (A). When the content of the fluorinated polyolefin-based resin is less than 0.05 parts by weight, flame retardancy is lowered, and when it exceeds 5 parts by weight, mechanical properties may be lowered, which is not preferable.

The polycarbonate resin composition according to the present invention may further include an additive according to each use. As the additive, UV stabilizers, fluorescent brighteners, lubricants, mold release agents, nucleating agents, antistatic agents, stabilizers, inorganic additives, pigments, dyes and the like may be used, but are not necessarily limited thereto. These may be used alone or in combination of two or more.

The release agent may be a fluorine-containing polymer, silicone oil, a metal salt of stearyl acid, a metal salt of mon carbonate, a montanic acid ester wax or a polyethylene wax, and the nucleating agent may be talc or clay. In addition, the inorganic additive may be used silica, clay, calcium carbonate, calcium sulfate or glass beads. The additive is suitably used in an amount of 30 parts by weight or less, preferably 0.0001 to 30 parts by weight, based on 100 parts by weight of the polycarbonate resin (A).

The polycarbonate 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 chips or pellets.

The polycarbonate resin composition of the present invention is excellent in flexural properties and flame retardancy, and excellent in mechanical properties such as impact strength, flexural strength, and national modulus of elasticity, and can be used for molding various products with high heat resistance. In particular, it is suitable for the manufacture of electric / electronic products and automobile parts requiring high flame retardancy and mechanical properties.

There is no particular limitation on the method of molding the plastic molded article using the polycarbonate resin composition according to the present invention, and for example, extrusion, injection, or casting may be applied. In addition, the molding method can be easily carried out by those skilled in the art to which the present invention belongs.

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 specification of each component used in the following Examples and Comparative Examples is as follows.

(A) polycarbonate resin

A polycarbonate resin of bisphenol-A type having a weight average molecular weight of 25,000 g / mol was used.

(B) phosphorus flame retardant

(B ₁ ) Cyclic phosphazene oligomeric compound

The phosphazene (SPS-100) of Otsuka, Japan was used.

(B ₂ ) phosphate ester compound

CR-741 from Daihachi, Japan, which is a bisphenol-A derived oligomeric phosphate ester compound, was used.

(C) fiber filler

(C ₁ ) plate filler

Nittobo glass fiber CSG 3PA-820 having a cross-sectional diameter of 28 μm and a cross-sectional longitudinal diameter of 7 μm having a cross-sectional ratio of 4 in length and 3 mm in length was used.

(C ₂ ) round filler

The glass fiber P952 of Vetrotex, which has a circular / vertical ratio of about 1, a length of 3 mm and a diameter of 10 μm, has a circular shape.

(D) fluorinated polyolefin resin

TEFLON (trade name) CFP 614A of Dupont, USA was used.

Example  1-7 and Comparative Example  1-5

After mixing the components according to the content shown in Table 1, and melted and kneaded in a twin screw melt extruder heated to 240 ~ 300 ℃ to prepare a resin composition in the chip state. The chip thus obtained was dried at a temperature of 130 ° C. for at least 5 hours, and then a specimen for measuring flame retardancy and a specimen for evaluation of mechanical properties were prepared using a screw injection machine heated to 240˜300 ° C.

With respect to the specimen obtained in the composition as shown in Table 1, flame retardancy, impact strength, flexural strength, flexural modulus, heat deflection temperature (HDT) and bending characteristics were evaluated in the following manner, and the results are shown in Table 2 below. .

Property evaluation method

(1) Flame retardancy: The specimens of 1/16 "thickness were measured by UL-94 vertical test method.

(2) Impact strength: measured in accordance with ASTM D256 for a 1/8 "thick specimen, and measured in kgf · cm / cm.

(3) Flexural strength: measured in accordance with ASTM D790 for a 1/4 "thick specimen, the unit is kgf / ㎠.

(4) Flexural modulus: measured in accordance with ASTM D790 for a 1/4 "thick specimen, the unit is kgf / ㎠.

(5) Heat deflection temperature (HDT): measured according to ASTM D648 (1/4 ", 18.5 kgf / ㎠, 120 ℃ / hr) standards.

(6) Flexural characteristics: When three corners of a thin-walled injection specimen having a length of 6 inches and a length of 1/16 inch were attached to the ground, the length of the other edge was measured from the ground and measured in mm. .

As shown in Table 2, it can be seen that the polycarbonate resin compositions of Examples 1 to 7 according to the present invention have excellent mechanical properties such as impact strength, flexural strength and flexural modulus, but also excellent flame retardancy and flexural characteristics.

On the other hand, Comparative Example 1, which does not use the phosphorus-based flame retardant (B), has a very low flame retardancy, and Comparative Example 2, which does not use the plate-shaped fiber filler (C ₁ ) having a cross-sectional ratio of 1.5 or more in cross section, is warped. Properties, heat resistance and flexural modulus were lowered. And instead of the plate-shaped fiber filler (C ₁ ) having a cross-sectional ratio of 1.5 or more in cross section, Comparative Examples 4 to 5 using a circular fiber filler (C ₂ ) having a cross-sectional ratio of about 1 has a warpage characteristic and The flame retardance fell. In addition, in Comparative Example 3 in which the plate-shaped fiber filler (C ₁ ) having a cross-sectional ratio of 1.5 or more in cross section outside the scope of the present invention, flame resistance and impact resistance were lowered.

The present invention is excellent in flame retardancy and flexural properties, excellent mechanical properties such as impact strength, flexural strength and flexural modulus, and is environmentally friendly because it does not emit halogen-based gas, and is suitable for the manufacture of electric / electronic products and automobile parts. It has the effect of providing the resin composition.

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 (9)

(A) 100 parts by weight of polycarbonate resin; (B) 1 to 15 parts by weight of a phosphorus flame retardant; (C) 5 to 100 parts by weight of the fiber filler having a cross-sectional ratio of 1.5 or more in cross section; And 0.05 to 5 parts by weight of (D) fluorinated polyolefin resin; Including, The phosphorus flame retardant (B) is a cyclic phosphazene oligomer compound (B ₁ ) represented by the following formula ( ₁ ), Flexural characteristics and flame retardancy characterized by the fact that when the three corners of a thin-walled injection specimen having a width of 6 inches and a thickness of 1/16 inch are attached to the ground, the other edge thereof is 0.01 to 0.4 mm or less away from the ground. This excellent polycarbonate resin composition: [Formula 1]

(Wherein R ₁ is an alkyl group, an aryl group, an alkyl substituted aryl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group or a hydroxyl group, respectively, and the alkoxy group or aryloxy group is an alkyl group, an aryl group, an amino group, or a hydroxyl group) Can be substituted; k and m are each independently an integer from 0 to 10; R ₂ is a C ₆ ~ C ₃₀ dioxyaryl or alkyl substituted C ₆ ~ C ₃₀ dioxyaryl group derivative; n is a number average As the degree of polymerization, the average value of n is 0 to 3.) The polycarbonate resin composition according to claim 1, wherein the phosphorus flame retardant (B) further comprises a phosphate ester compound (B ₂ ). The polycarbonate resin composition of claim 2, wherein the phosphate ester compound (B ₂ ) is represented by the following Chemical Formula 2: [Formula 2]

Wherein R ₃ , R ₄ , R ₆ and R ₇ are each independently a C ₆ to C ₂₀ aryl group or an alkyl substituted C ₆ to C ₂₀ aryl group; R ₅ is a C ₆ to C ₃₀ aryl group or alkyl substitution Is a C ₆ to C ₃₀ aryl group derivative; L is the number average degree of polymerization, and the average value of L is 0 to 3.) The polycarbonate resin composition according to claim 1, wherein the fiber filler (C) has a width / length ratio of 1.5 to 8 in cross section. The polycarbonate resin composition according to claim 1, wherein the fiber filler (C) is selected from the group consisting of glass fibers, carbon fibers, aramid fibers, potassium titanate fibers, silicon carbide fibers and mixtures thereof. The method of claim 1, wherein the fluorinated polyolefin resin (D) is polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene / vinylidene fluoride copolymer, tetrafluoroethylene / hexafluoropropylene air Polycarbonate resin composition, characterized in that it is selected from the group consisting of copolymers, ethylene / tetrafluoroethylene copolymers and mixtures thereof. The method of claim 1, wherein the resin composition further comprises an additive selected from the group consisting of UV stabilizers, optical brighteners, lubricants, brothers, nucleating agents, antistatic agents, stabilizers, inorganic additives, pigments, dyes and mixtures thereof. A polycarbonate resin composition characterized by the above. A plastic molded article molded from the polycarbonate resin composition according to any one of claims 1 to 7. The thin film injection specimen of claim 8, wherein the molded article has a flame retardancy measured by a UL 94 vertical test method at a thickness of 1/16 ″, V-0 or more, a length of 6 inches in length and length, and 1/16 inch in thickness. Plastic molded article, characterized in that the length of the other edge is 0.01 ~ 0.4 ㎜ away from the ground when the three corners of the.