KR101311938B1 - Polycarbonate thermoplastic resin composition - Google Patents

Abstract

The present invention relates to a polycarbonate-based thermoplastic resin composition, more specifically, to 100 parts by weight of the polycarbonate-based thermoplastic resin composition, (A) 30 to 80 parts by weight of a polycarbonate resin; (B) 10 to 50 parts by weight of the (meth) acrylic acid alkyl ester copolymer; And (C) 5 to 30 parts by weight of the rubber modified vinyl graft copolymer .

The polycarbonate-based thermoplastic resin composition has excellent weld strength and impact resistance, and excellent balance of physical properties such as fluidity, heat resistance, thermal stability, and workability, and is widely used in electrical and electronic housings, computer housings, and other office equipment requiring complex molding of thin films. Is applicable.

Polycarbonate resin, methacrylic acid alkyl ester copolymer, rubber modified vinyl graft copolymer, vinyl copolymer

Description

Polycarbonate-based thermoplastic resin composition {POLYCARBONATE THERMOPLASTIC RESIN COMPOSITION}

The present invention relates to a polycarbonate-based thermoplastic resin composition, and more particularly, to a polycarbonate-based thermoplastic resin composition having excellent weld strength and shock resistance and excellent balance of physical properties of fluidity, heat resistance, thermal stability and workability.

Blends of polycarbonate / vinyl-based copolymers are resins which are widely used in automobile parts, computer housings or other office equipment as resin mixtures having improved processability while maintaining excellent impact resistance, heat resistance and mechanical strength. However, the blend of the polycarbonate / vinyl copolymer has a disadvantage of showing very low mechanical strength at the weld site generated when molding an injection product having two or more gates due to the low compatibility of the polycarbonate and the vinyl copolymer. .

The formation of weld parts is an inevitable factor in the use of complex types of computers, electronics, housings, and other office equipment.In addition, polycarbonate / vinyl-based aerials are becoming more popular due to the thinning, housing, and multifunctional housings of electrical and electronic products. There is an increasing demand for improved weld strength of coalescing blends.

In general, it is known that the weld strength increases when the viscosity of the blend is lowered by increasing the molecular weight of the polycarbonate in the polycarbonate / vinyl copolymer blend. However, they are complicated due to the low viscosity or when thin film molding, the work should be carried out at a temperature higher than the molding temperature of a typical polycarbonate / vinyl copolymer blend. Increasing the molding temperature has a problem that the effect of the improved weld strength improvement through the viscosity decreases there is a problem in use.

In addition, in order to improve the low compatibility of the polycarbonate and vinyl copolymer, methyl methacrylate-based compatibilizers having moderate compatibility with these two components may be used, but methyl methacrylate-based polycarbonate / vinyl At 250 ° C to 280 ° C, which is a general molding temperature of the system copolymer, there is a problem in that compatibility with polycarbonate is lowered, and moldability decreases when an excessive amount is applied, and thus restrictions on use are provided for the purpose of improving weld strength.

One embodiment of the present invention is to provide a polycarbonate-based thermoplastic resin composition having excellent weld strength and shock resistance, and excellent balance of physical properties of fluidity, heat resistance, thermal stability and workability.

Another embodiment of the present invention is to provide a molded article prepared from the polycarbonate-based thermoplastic resin composition.

However, technical problems to be achieved by the present invention are not limited to the above-mentioned problems, and other technical problems will be clearly understood by those skilled in the art from the following description.

One embodiment of the present invention, based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition, (A) 30 to 80 parts by weight of a polycarbonate resin; (B) 10 to 50 parts by weight of the (meth) acrylic acid alkyl ester copolymer; And (C) it provides a polycarbonate-based thermoplastic resin composition comprising 5 to 30 parts by weight of rubber-modified vinyl-based graft copolymer.

Another embodiment of the present invention provides a molded article prepared from the polycarbonate-based thermoplastic resin composition.

Other specific details of embodiments of the present invention are included in the following detailed description.

The polycarbonate-based thermoplastic resin composition according to the present invention has excellent weld strength and shock resistance, and has excellent balance of physical properties such as fluidity, heat resistance, heat stability, and workability. It is widely applicable to equipment and the like.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, by which the present invention is not limited and the present invention is defined only by the scope of the claims to be described later.

Unless stated otherwise in the specification, a substituted alkyl group, a substituted alkylene group, a substituted alkylidene group, a substituted cycloalkylene group, a substituted cycloalkylidene group, a substituted aryl group, and a substituted arylene group are each independently Alkyl group, alkylene group, alkyl substituted with halogen group, alkyl group of 1 to 30 carbon atoms, haloalkyl group of 1 to 30 carbon atoms, aryl group of 6 to 30 carbon atoms, heteroaryl group of 2 to 30 carbon atoms, alkoxy group of 1 to 20 carbon atoms It means a lidene group, a cycloalkylene group, a cycloalkylidene group, an aryl group, and an arylene group.

Polycarbonate-based thermoplastic resin composition according to an embodiment of the present invention, based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition, (A) 30 to 80 parts by weight of a polycarbonate resin; (B) 10 to 50 parts by weight of the (meth) acrylic acid alkyl ester copolymer; And (C) 5 to 30 parts by weight of the rubber modified vinyl graft copolymer.

Hereinafter, each component included in the polycarbonate-based thermoplastic resin composition according to the exemplary embodiment of the present invention will be described in detail.

(A) Polycarbonate resin

The polycarbonate resin may be prepared by reacting a diphenol represented by Formula 1 with a compound selected from the group consisting of phosgene, halogen formate, carbonic acid diester, and combinations thereof.

[Formula 1]

(In the formula 1,

A is a single bond, a substituted or unsubstituted C1-C5 alkylene group, a substituted or unsubstituted C1-C5 alkylidene group, a substituted or unsubstituted C3-C6 cycloalkylene group, substituted or unsubstituted A cycloalkylidene group having 5 to 6 carbon atoms, CO, S, and SO ₂ ;

Each R ₁ and each R ₂ are each independently a substituent selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 30 carbon atoms,

n ₁ and n ₂ are each independently an integer of 0 to 4.)

Examples of the diphenols represented by Formula 1 include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis- (4-hydroxyphenyl) -propane, and 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, and the like, among which 2,2-bis- (4-hydroxyphenyl) -propane called bisphenol-A is used. Good to do.

The polycarbonate resin preferably has a weight average molecular weight (Mw) of 10,000 kPa to 200,000 g / mol, more preferably 15,000 kPa to 80,000 g / mol. When the weight average molecular weight of the polycarbonate resin has the above range, it is possible to secure excellent impact strength and workability.

In addition, the polycarbonate resin may be a branched chain, preferably 0.05 to 2 mol% of a tri-polyfunctional compound or more polyfunctional compounds, such as trivalent phenol, based on the total amount of diphenols used for polymerization. It can be prepared by adding a compound having a group or more phenol group.

As the polycarbonate resin, both homo polycarbonates, copolycarbonates, or blends thereof may be used.

The polycarbonate resin can also be used in part or in whole by an aromatic polyester-carbonate resin obtained by polymerization in the presence of an ester precursor, such as a bifunctional carboxylic acid.

The polycarbonate resin may be included in an amount of 30 to 80 parts by weight, preferably 45 to 75 parts by weight, based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition. When polycarbonate resin is contained in the said range, it is preferable at the point of the excellent balance of heat resistance, "shock resistance", and moldability.

(B) (meth) acrylic acid alkyl ester copolymer

The (meth) acrylic acid alkyl ester copolymer is composed of a terpolymer of (b1) (meth) acrylic acid alkyl ester monomer, (b2) aromatic vinyl monomer, and (b3) unsaturated nitrile monomer.

The (meth) acrylic acid alkyl ester copolymer according to one embodiment of the present invention is based on 100 parts by weight of the (meth) acrylic acid alkyl ester copolymer (b1) 40 to 80 parts by weight of the (meth) acrylic acid alkyl ester monomer and ( b2) 10 to 30 parts by weight of an aromatic vinyl monomer is initially added to the reactor at a time for preliminary polymerization, and (b3) 2 to 50 parts by weight of unsaturated nitrile monomer is continuously or several times divided into several portions to perform polymerization. It can be prepared by the method of completion.

Specifically, the (b1) (meth) acrylic acid alkyl ester monomer, (b2) aromatic vinyl monomer, initiator, deionized water as a solvent, and dispersant, dispersion aid, and molecular weight regulator as other additives are initially added to the reactor at one time. After stirring sufficiently, the temperature is raised to copolymerize. Subsequently, the (b3) unsaturated nitrile monomer is continuously added or continuously divided into the prepolymer of the (b1) (meth) acrylic acid alkyl ester monomer and the (b2) aromatic vinyl monomer to complete copolymerization.

As the (b1) (meth) acrylic acid alkyl ester monomer, a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 10 carbon atoms is used, and specifically, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and the like. May be used, and preferably methyl methacrylate may be used.

The aromatic vinyl monomers (b2) include styrene; C1-C8 alkyl substituted styrene, such as o-ethyl styrene, m-ethyl styrene, p-ethyl styrene, (alpha) -methyl styrene, etc. can be used.

Acrylonitrile, methacrylonitrile, ethacrylonitrile, etc. can be used as said (b3) unsaturated nitrile-type monomer. The unsaturated nitrile monomer is added in an amount of 2 to 50 parts by weight, preferably 2 to 30 parts by weight, based on 100 parts by weight of the (meth) acrylic acid alkyl ester copolymer.

In addition, a general peroxide or azobis-based initiator may be used as the initiator, and specifically, but may be used azeobis isobutyronitrile, benzoyl peroxide, and the like.

In the copolymerization, other additives such as a dispersant, a dispersion aid, and a molecular weight regulator may be further used to improve copolymerization efficiency.

The dispersant may be a metal phosphate series such as tricalcium phosphate or trisodium phosphate, or a polymer system such as polyvinyl alcohol or polyvinylpyrrolidone.

As the dispersion aid, both water-soluble and oil-soluble dispersion aids may be used, and typically, carboxylic acid-based polymers may be used.

Moreover, tertiary mercaptan etc. can be used as said molecular weight regulator.

The (meth) acrylic acid alkyl ester copolymer may be used alone or in the form of a mixture of two or more thereof.

The (meth) acrylic acid alkyl ester copolymer according to one embodiment of the present invention is included in an amount of 10 to 50 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition. When the (meth) acrylic acid alkyl ester copolymer is included in the above range, it is preferable in view of excellent balance of scratch resistance and impact resistance.

(C) a rubber-modified vinyl-based graft copolymer

The rubber-modified vinyl-based graft copolymer serves as an impact reinforcing material in the resin composition, and the rubber-modified vinyl-based graft copolymer is (c ₁ ) 5 to 95% by weight of a vinyl monomer (c ₂ ) It is prepared by graft copolymerization to 5 to 95% by weight of the polymer.

The vinyl monomer (c ₁ ) is (c ₁₁ ) alkyl substituted styrene having 1 to 8 carbon atoms, methacrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms, such as styrene, halogen substituted styrene, or α-methylstyrene, 50 to 95% by weight of the first vinyl monomer selected from the group consisting of acrylic acid alkyl esters having alkyl groups having 1 to 8 carbon atoms, and mixtures thereof, (c ₁₂ ) acrylonitrile, methacrylonitrile, 1 carbon atom Methacrylic acid alkyl esters having alkyl groups of 8 to 8, acrylic acid alkyl esters having alkyl groups of 1 to 8 carbon atoms, maleic anhydride, alkyl N-substituted maleimides having 1 to 4 carbon atoms, phenyl N-substituted maleimides and their It consists of 5 to 50% by weight of the second vinyl monomer selected from the group consisting of a mixture.

The methacrylic acid alkyl esters or acrylic acid alkyl esters are alkyl esters having 1 to 8 carbon atoms obtained from monohydryl alcohols containing 1 to 8 carbon atoms. Specific examples thereof include methacrylic acid methyl ester, methacrylic acid ethyl ester, acrylic acid ethyl ester, acrylic acid methyl ester or methacrylic acid propyl ester. Of these, methacrylic acid methyl ester is most preferred.

The rubbery polymer (c ₂ ) is butadiene rubber, acrylic rubber, ethylene / propylene rubber, styrene / butadiene rubber, acrylonitrile / butadiene rubber, isoprene rubber, ethylene-propylene-diene terpolymer (EPDM), polyorganosiloxane / Polyalkylmethacrylate rubber composites, and mixtures thereof.

Preferred examples of the rubber-modified vinyl-based graft copolymers include graft copolymers of butadiene rubber, acrylic rubber or styrene / butadiene rubber in the form of a mixture of styrene, acrylonitrile and optionally (meth) acrylic acid alkyl ester monomers. Can be mentioned. Further preferred examples of the rubber-modified vinyl-based graft copolymers include those obtained by graft copolymerization of a monomer of (meth) acrylic acid methyl ester to butadiene rubber, acrylic rubber, or styrene / butadiene rubber, and most preferably ABS (acrylonitrile-butadiene-styrene) is a graft copolymer.

In preparing the graft copolymer, the average particle diameter of the rubbery polymer is preferably 0.05 kPa to 4 µm in order to improve impact strength and surface properties of the molded product.

The rubber-modified vinyl-based graft copolymer is well known to those skilled in the art, and any of emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization may be used. As a preferable production method, the vinyl monomer is introduced into the presence of a rubbery polymer, and then emulsion polymerization or bulk polymerization is carried out using a polymerization initiator.

The rubber-modified vinyl-based graft copolymer may be included in an amount of 5 to 30 parts by weight based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition, preferably 5 to 20 parts by weight. When the rubber-modified vinyl-based graft copolymer is included in the above range, it is preferable in view of excellent balance of impact resistance, modulus and heat resistance.

(D) a vinyl-based copolymer

The thermoplastic resin composition according to the embodiment of the present invention may further include a vinyl copolymer together with the components (A) to (C).

The vinyl copolymer may include (d ₁ ) alkyl substituted styrenes having 1 to 4 carbon atoms such as styrene and α-methyl styrene, halogen substituted styrenes, methacrylic acid alkyl esters having alkyl groups having 1 to 8 carbon atoms, and 1 to 8 carbon atoms. 50 to 95% by weight of a first vinyl monomer selected from the group consisting of acrylic acid alkyl esters having an alkyl group, and mixtures thereof; And (d ₂ ) acrylonitrile, methacrylonitrile, methacrylic acid alkyl esters having alkyl groups of 1 to 8 carbon atoms, acrylic acid alkyl esters having alkyl groups of 1 to 8 carbon atoms, maleic anhydride and 1 to 4 carbon atoms. It can be prepared by copolymerizing 5 to 50% by weight of a second vinyl monomer selected from the group consisting of alkyl groups or phenyl N-substituted maleimides, and mixtures thereof.

The methacrylic acid alkyl esters or acrylic acid alkyl esters are esters obtained from monohydryl alcohols containing 1 to 8 carbon atoms. As these specific examples, methacrylic acid methyl ester, methacrylic acid ethyl ester, methacrylic acid propyl ester, acrylic acid ethyl ester, acrylic acid methyl ester, etc. are mentioned.

The vinyl copolymer may be produced as a by-product in the preparation of the rubber-modified vinyl graft copolymer, and in particular, a chain transfer agent used for grafting an excess monomer mixture to a small amount of rubbery polymer or as a molecular weight control agent. This can occur more often when the chain transfer agent is used in excess.

However, the content of the vinyl copolymer used in the preparation of the resin composition according to the embodiment of the present invention does not include the by-product of the rubber-modified vinyl graft copolymer.

The vinyl copolymers include monomer mixtures of styrene, acrylonitrile,, and optionally methacrylic acid methyl ester; monomer mixtures of α-methylstyrene, acrylonitrile, and optionally methacrylic acid methyl ester; Or those prepared from monomer mixtures of styrene, α-methylstyrene, acrylonitrile, and optionally methacrylic acid methyl ester can be preferably used.

The vinyl copolymer may be prepared by emulsion polymerization, suspension polymerization, solution polymerization or bulk polymerization, and it is preferable to use a weight average molecular weight of 15,000 to 300,000 g / mol.

Other preferred vinyl copolymers include methacrylic acid methyl ester polymers prepared from a monomer mixture of methacrylic acid methyl ester monomers and optionally acrylic acid methyl esters or acrylic acid ethyl esters. The vinyl copolymer may be prepared by emulsion polymerization, suspension polymerization, solution polymerization or bulk polymerization, and it is preferable to use a weight average molecular weight of 20,000 to 250,000 g / mol.

Another preferred vinyl copolymer is a copolymer of styrene and maleic anhydride, which can be prepared using a continuous bulk polymerization method and a solution polymerization method. The composition ratio of the styrene and maleic anhydride can be varied in a wide range, preferably, the content of maleic anhydride is 5 to 50% by weight relative to the vinyl copolymer. The molecular weight of the styrene and maleic anhydride copolymer may also be used in a wide range, but may be preferably used having a weight average molecular weight of 20,000 to 200,000 g / mol, it may be preferably used intrinsic viscosity of 0.3 to 0.9.

As the styrene monomer substituted with an alkyl group having 1 to 4 carbon atoms which can be used in the production of the vinyl copolymer, p-methylstyrene, vinyltoluene, 2,4-dimethylstyrene, etc. may be preferably used in addition to α-methylstyrene.

The vinyl copolymer may be used alone or in the form of a mixture of two or more thereof.

The vinyl copolymer may be included in the range of 0 to 50 parts by weight, preferably 1 to 50 parts by weight, and more preferably 5 to 30 parts by weight based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition. When the vinyl copolymer is included in the above range, impact resistance is improved.

(E) Other additives

Polycarbonate-based thermoplastic resin composition according to an embodiment of the present invention is a flame retardant, flame retardant aid, lubricant, mold release agent, nucleating agent, antistatic agent, stabilizer, organic-inorganic reinforcement, pigments, dyes, etc. in addition to the above components Other additives may be further included.

The releasing agent may be a fluorine-containing polymer, a silicone oil, a metal salt of stearic acid, a metal salt of montanic acid, a montanic acid ester wax or a polyethylene wax, and the nucleating agent may be talc or clay.

The other additives may be used in the range of 40 parts by weight or less, preferably 0.1 to 20 parts by weight based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition.

The polycarbonate-based thermoplastic resin composition having the composition as described above may be prepared by a known method for preparing a resin composition, for example, the components and other additives are mixed at the same time, and then melt-extruded in an extruder to form pellets. can do.

The thermoplastic resin composition may be used for molding a variety of products, and in particular, it is widely applicable to electrical and electronic housings, computer housings, and other office equipment, which require complicated molding of thin films.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited by the following examples.

[Example]

(A) polycarbonate resin, (B) (meth) acrylic acid alkyl ester copolymer, (C) rubber modified vinyl graft copolymer, and (D) vinyl copolymer used in the following Examples and Comparative Examples The specification is as follows.

(A) Polycarbonate resin

A polycarbonate of bisphenol A type having a weight average molecular weight (Mw) of 25,000 g / mol was used.

(B) (meth) acrylic acid alkyl ester copolymer

50 parts by weight of methyl methacrylate monomer, 20 parts by weight of styrene monomer, 0.2 parts by weight of azobisisobutyronitrile, 0.5 parts by weight of tricalcium phosphate, 0.01 parts by weight of Ethapol 1000 (Akzo nobel) as a dispersing aid, tertiary mercaptan 0.2 weight part and 200 weight part of deionized water were put into a closed reactor, and the temperature was raised to 70 degreeC with sufficient stirring, and superposition | polymerization was started. After heating to 70 ° C., 30 parts by weight of acrylonitrile monomer was continuously added to the reactor over 3 hours. The polymerization temperature was continuously heated to 90 ° C. over 3 hours to polymerize, and then heated to 100 ° C. The reaction was terminated by maintaining the temperature at 100 ° C. for 60 minutes and then lowering the temperature. The resulting methacrylic acid alkyl ester copolymer was washed and dried to obtain white beads.

(C) a rubber-modified vinyl-based graft copolymer

Butadiene rubber latex was added so that the butadiene content was 58 parts by weight based on the total amount of monomers, and 31 parts by weight of styrene, 11 parts by weight of acrylonitrile, and 150 parts by weight of deionized water were added to prepare a reaction product. 1.0 parts by weight of potassium oleate, 0.4 parts by weight of cumene hydroperoxide, and 0.3 parts by weight of t-dodecyl mercaptan chain transfer agent were added to the reactants, and reacted while maintaining at 75 ° C. for 5 hours for ABS (acrylonitrile-butadiene-styrene). ) Graft copolymer was prepared.

A 1% sulfuric acid solution was added to the copolymer latex, solidified and dried to prepare a rubber-modified vinyl graft copolymer resin having a core-shell form having an average particle diameter of 0.3 μm in powder form.

(D) a vinyl-based copolymer

71 parts by weight of styrene, 29 parts by weight of acrylonitrile, and 120 parts by weight of deionized water were mixed to prepare a reaction product, and 0.17 parts by weight of azobisisobutyronitrile, 0.4 part by weight of t-dodecyl mercaptan chain transfer agent, and After adding 0.5 parts by weight of tricalcium phosphate was suspended polymerization at 75 ℃ for 5 hours to prepare a styrene-acrylonitrile (SAN) copolymer copolymer resin. The copolymer was washed with water, dehydrated and dried to prepare a SAN copolymer resin in powder form.

Examples 1 to 3

To the composition of each component shown in Table 1, the antioxidant Iganox 1076 (Ciba Specialty Co.) was added and mixed in a conventional mixer, and the nozzle temperature was 260 ° C using a twin screw extruder having L / D = 35 and Φ = 45 mm. After extrusion under the condition of, an extrudate was prepared in pellet form. The prepared pellets were dried at 80 ° C. for at least 5 hours before injection molding.

Specimens for measuring physical properties were prepared using a 10 oz injection machine at an injection temperature of 250 ° C., and specimens for measuring weld strength were prepared using a 10 oz injection machine at an injection temperature of 250 ° C.

Comparative Example 1

Except that in Example 1, 5 parts by weight of the (B) (meth) acrylic acid alkyl ester copolymer, (C) 20 parts by weight of the rubber-modified vinyl copolymer, and 25 parts by weight of the vinyl copolymer (D) were used. A specimen was prepared in the same manner as in Example 1.

Comparative Example 2

Except that (B) 55 parts by weight of the (meth) acrylic acid alkyl ester copolymer, (C) 5 parts by weight of the rubber-modified vinyl copolymer, and (D) the vinyl copolymer were not used. A specimen was prepared in the same manner as in Example 1.

Comparative Example 3

In Example 1, without using the (B) (meth) acrylic acid alkyl ester copolymer, (A) 75 parts by weight of polycarbonate resin, (C) 10 parts by weight of rubber modified vinyl copolymer, and (D) vinyl A specimen was prepared in the same manner as in Example 1 except that 15 parts by weight of the copolymer was used.

[Table 1]

After the specimens prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were allowed to stand at 23 ° C. and 50% relative humidity for 48 hours, physical properties were evaluated in the following manner. The results are shown in Table 2 below.

(1) Izod impact strength: Izod impact strength (1/8 "notch, kgf · cm / cm) was measured according to ASTM D256.

(2) Weld Impact Strength: After forming a weld in the center of the specimen through both side gates, the Izod impact strength (1/8 ", kgf cm / cm) was measured according to ASTM D256.

(3) Flow index: measured at 250 ℃, 10kg conditions in accordance with ASTM D1238.

[Table 2]

As shown in Table 2, in the case of the polycarbonate-based thermoplastic resin composition prepared in Examples 1 to 3 it can be seen that the weld strength and the Izod impact strength is excellent. In addition, it can be seen from Example 3 that even if the ratio of the polycarbonate and the (meth) acrylic acid alkyl ester copolymer is changed, the weld strength is still excellent. However, in Comparative Example 1 in which the (B) (meth) acrylic acid alkyl ester copolymer was applied lower than the range of the present invention, sufficient weld strength did not appear, and (B) Comparative Example 2 in which the (meth) acrylic acid alkyl ester copolymer was applied in excess. It can be seen that the Izod impact strength is much lowered. In addition, in Comparative Example 3 (B) (meth) acrylic acid alkyl ester copolymer is not applied, the Izod impact strength is excellent, but it can be seen that the weld strength is very low.

The present invention is not limited to the above embodiments, but may be manufactured in various forms, and a person skilled in the art to which the present invention pertains has another specific form without changing the technical spirit or essential features of the present invention. It can be understood that this can be implemented. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (6)

Based on 100 parts by weight of the polycarbonate-based thermoplastic resin composition, (A) 30 to 80 parts by weight of a polycarbonate resin; (B) 10 to 50 parts by weight of the (meth) acrylic acid alkyl ester copolymer; And (C) 5 to 30 parts by weight of rubber-modified vinyl-based graft copolymer, The (B) (meth) acrylic acid alkyl ester copolymer is 40 to 60 parts by weight of the (meth) acrylic acid alkyl ester monomer and 10 to 30% by weight of the aromatic vinyl monomer based on 100 parts by weight of the (meth) acrylic acid alkyl ester copolymer. And a polycarbonate-based thermoplastic resin composition which is a terpolymer of 30 to 50 parts by weight of an unsaturated nitrile monomer. delete The method of claim 1, The (C) rubber-modified vinyl-based graft copolymer is a polycarbonate-based thermoplastic resin composition prepared by graft polymerization of 5 to 95% by weight of a vinyl monomer to 5 to 95% by weight of a rubbery polymer. (A) 30 to 80 parts by weight of a polycarbonate resin; (B) 10 to 50 parts by weight of the (meth) acrylic acid alkyl ester copolymer; And (C) 100 parts by weight of the polycarbonate-based thermoplastic resin composition consisting of 5 to 30 parts by weight of the rubber-modified vinyl-based graft copolymer One or more additives selected from flame retardants, flame retardant aids, lubricants, mold release agents, nucleating agents, antistatic agents, stabilizers, organic and inorganic reinforcements, pigments, and dyes are added in an amount of up to 40 parts by weight, The (B) (meth) acrylic acid alkyl ester copolymer is 40 to 60 parts by weight of the (meth) acrylic acid alkyl ester monomer and 10 to 30% by weight of the aromatic vinyl monomer based on 100 parts by weight of the (meth) acrylic acid alkyl ester copolymer. And a polycarbonate-based thermoplastic resin composition which is a terpolymer of 30 to 50 parts by weight of an unsaturated nitrile monomer. delete A molded article prepared from the polycarbonate-based thermoplastic resin composition according to any one of claims 1, 3, and 4.