KR102181558B1 - Polycarbonate resin composition - Google Patents

Abstract

In the present invention, by including a methyl methacrylate-butadiene copolymer together with a polycarbonate and styrene-acrylonitrile copolymer as an impact modifier, it has excellent light resistance, scratch resistance and mechanical properties, as well as high blackness, and a small amount By further including polybutylene terephthalate of, there is provided a polycarbonate-based resin composition that can further improve light resistance.

Description

Polycarbonate resin composition {POLYCARBONATE RESIN COMPOSITION}

The present invention relates to a polycarbonate resin composition having excellent light resistance, scratch resistance, and mechanical properties, and exhibiting high blackness.

Polycarbonate is a resin prepared by condensation polymerization of an aromatic diol such as bisphenol A and a carbonate precursor such as phosgene, and has excellent mechanical and thermal properties. In particular, it has high impact resistance at room temperature and has excellent dimensional stability. Research is being conducted to realize excellent physical properties by reinforcing polycarbonate with various types of fillers.

Recently, in addition to polycarbonate, a method for improving physical properties by mixing with other resins such as ABS (acrylonitrile-butadiene-styrene-based copolymer) has been developed.

For example, studies on polycarbonate-based resin compositions that improve processability by mixing polycarbonate and ABS (acrylonitrile-butadiene-styrene-based copolymer) are being actively conducted, and these are usually PC/ABS resins or PC/ABS It is called Alloy. PC/ABS material is a thermoplastic resin mixture that improves workability while maintaining high notch impact strength.Since it has relatively high heat resistance, it can be used for various parts of automobiles such as Centerfacia, Air-vent bezel, and Garnish, and housing of computers or other office equipment. It is applied to large-sized injection products that emit a lot of heat. It also has excellent flame retardancy, and its use area is increasing recently.

However, even though the PC/ABS material has excellent mechanical properties such as impact resistance and heat resistance, there is a problem in that surface properties such as light resistance and scratch resistance are inferior.

In addition, in order to improve light resistance and scratch resistance, polycarbonate (PC) and polymethyl methacrylate (PMMA), styrene-acrylonitrile copolymer (SAN), and acrylonitrile-butadiene-styrene copolymer (ABS) were used. There is a way to mix. However, the resin composition prepared by the above method can improve light resistance and scratch resistance by using a PMMA resin, but there is a problem in that heat resistance and impact resistance are inferior, and it is difficult to implement a deep black color.

In addition, there is a method of mixing polycarbonate (PC), styrene-acrylonitrile copolymer (SAN), acrylonitrile-styrene-acrylate copolymer (ASA), and an impact modifier (acrylic or silicone) to improve light resistance. . However, in the case of a general PC/ASA resin composition, light resistance is excellent, but impact resistance is poor and it is difficult to implement a deep black color.

Therefore, it is necessary to develop a new material excellent in all of mechanical properties, light resistance, scratch resistance, and blackness.

Accordingly, an object of the present invention is to provide a polycarbonate resin composition having excellent mechanical properties, light resistance, scratch resistance, and blackness, and a molded article manufactured using the same.

According to an embodiment of the present invention, polycarbonate comprising 60 to 70% by weight of polycarbonate, 20 to 30% by weight of a styrene-acrylonitrile copolymer, and 4 to 10% by weight of a methyl methacrylate-butadiene copolymer It provides a resin composition.

Further, according to another embodiment of the present invention, it provides a molded article comprising the polycarbonate-based resin composition.

The polycarbonate-based resin composition according to an embodiment of the present invention is a methyl methacrylate having a high methyl methacrylate (MMA) content instead of ABS or MBS that is conventionally used as an impact modifier together with a polycarbonate and styrene-acrylonitrile copolymer. By applying the rate-butadiene copolymer and optimizing the content composition ratio of the above components, it is possible to exhibit excellent effects in light resistance, scratch resistance, and mechanical properties, as well as excellent blackness. Further, the polycarbonate resin composition of the present invention can further improve light resistance by further including a small amount of polybutylene terephthalate.

In addition, the polycarbonate-based resin composition exhibits excellent compatibility and may exhibit excellent appearance characteristics when manufacturing a molded article. Accordingly, it can be applied to various fields such as automobiles, OA electronic devices, and electric electronic devices, and is particularly useful for manufacturing various parts of automobiles such as centerfacia, air-vent bezel, and garnish that require improved frictional noise with excellent appearance characteristics. .

The terms used in the present specification are only used to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprises", "includes" or "have" are intended to designate the existence of a feature, step, component, or combination of the implemented features, one or more other features or steps, It is to be understood that the possibility of the presence or addition of components, or combinations thereof, is not excluded in advance.

The present invention will be described in detail below and exemplify specific embodiments, as various changes can be made and various forms can be obtained. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, a polycarbonate-based resin composition according to a specific embodiment of the present invention and a molded article including the same will be described in more detail.

In the present invention, when preparing a polycarbonate-based resin composition comprising a polycarbonate (PC) and a styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene copolymer (ABS) or By including a certain amount of methyl methacrylate-butadiene copolymer (MB) without using the methyl methacrylate-butadiene-styrene copolymer (MBS), it exhibits high blackness while excellent in both light resistance, impact resistance and mechanical properties. It can provide an effect. In addition, the polycarbonate-based resin composition of the present invention can further improve light resistance by further including a specific small amount of polybutylene terephthalate (PBT). In addition, since the polycarbonate-based resin composition of the present invention is mixed in an optimal composition ratio, it is excellent in compatibility with realization of the above physical properties, and quality characteristics of a molded article can be improved.

Specifically, according to an embodiment of the present invention, comprising 60 to 70% by weight of polycarbonate, 20 to 30% by weight of a styrene-acrylonitrile copolymer, and 4 to 10% by weight of a methyl methacrylate-butadiene copolymer , A polycarbonate-based resin composition may be provided.

The polycarbonate resin composition of the present invention does not contain an ABS resin.

In addition, according to another embodiment of the present invention, the polycarbonate-based resin composition may further include polybutylene terephthalate. Preferably, it may further include 3 to 8% by weight of polybutylene terephthalate based on the total weight of the total resin composition.

Hereinafter, each component will be described in more detail.

(a) polycarbonate

The polycarbonate is a base resin included in the polycarbonate-based resin composition, and more specifically, may be an aromatic polycarbonate prepared by polymerization reaction of an aromatic diol-based compound and a carbonate precursor.

The aromatic diol-based compound for preparing the polycarbonate may be a bisphenol-based compound, specifically bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone , Bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 2,2- Bis(4-hydroxyphenyl)propane (bisphenol A; BPA), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z; BPZ) , 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4 -Hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3-chlorophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2 -Bis(4-hydroxy-3,5-dimethylphenyl)propane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl)diphenylmethane or α,ω -Bis[3-(ο-hydroxyphenyl)propyl]polydimethylsiloxane, and the like, and any one or a mixture of two or more of them may be used.

In addition, the carbonate precursors include dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditolyl carbonate, bis(chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (Diphenyl) carbonate, carbonyl chloride (phosgene), triphosgene, diphosgene, carbonyl bromide, bishaloformate, and the like, and any one or a mixture of two or more of them may be used. Phosgene or phosgene can be used.

More specifically, the polycarbonate may include a repeating unit represented by the following Formula 1 formed by reacting a hydroxy group of an aromatic diol-based compound and a carbonate precursor:

[Formula 1]

In Formula 1,

R ₁ to R ₄ are each independently hydrogen, C1-10 alkyl, C1-10 alkoxy, or halogen,

Z is selected from the group consisting of unsubstituted or phenyl substituted C1-10 alkylene, unsubstituted or C1-10 alkyl substituted C3-15 cycloalkylene, O, S, SO, SO ₂ , and CO do.

More specifically, in Formula 1, R ₁ to R ₄ are each independently hydrogen, methyl, chloro, or bromo, and Z is methylene, ethane-1,1-diyl, propane-2,2-diyl, butane- Straight or branched C1-10 alkylene unsubstituted or substituted with phenyl, such as 2,2-diyl, 1-phenylethane-1,1-diyl, or diphenylmethylene, or O, S, SO, It may be SO ₂ , or CO. More specifically, in Formula 1, Z may be cyclohexane-1,1-diyl, O, S, SO, SO ₂ , or CO.

For example, when bisphenol A and triphosgene are polymerized as a carbonate precursor, the polycarbonate may include a repeating unit represented by the following Formula 1-1:

[Formula 1-1]

In addition, the polycarbonate may have a melt flow index (MFRR) (300°C, 1.2kg) measured according to ASTM D1238 of 2 to 30 g/10min, more specifically 3 to 20 g/10min, and within this range It has excellent processability and excellent balance of properties.

In addition, the polycarbonate may have a density measured according to ASTM D792 of 0.8 to 1.5 g/cm 3, more specifically 1.0 to 1.3 g/cm 3. Within the above range, the impact strength is excellent and the fluidity is good, so that excellent workability can be obtained.

In addition, the polycarbonate may have a weight average molecular weight (Mw) of 20,000 to 60,000 g/mol, and excellent workability can be obtained due to excellent impact strength and good fluidity within the above range.

The above-described polycarbonate may be directly synthesized according to a well-known synthesis method of a general aromatic polycarbonate, or commercially available aromatic polycarbonate may be obtained and used.

In addition, the polycarbonate may be included in an amount of 60 to 70% by weight, more specifically 65 to 70% by weight, based on the total weight of the resin composition. When included in the above content range, the heat resistance and impact strength of the resin composition may be improved. That is, when the content of the polycarbonate is 60% by weight or less, there is a problem that heat resistance and impact strength are deteriorated, and when it is 70% by weight or more, there is a problem that the moldability is deteriorated.

(b) styrene-acrylonitrile copolymer

The styrene-acrylonitrile copolymer is a copolymer resin in which a styrene-based monomer and acrylonitrile are grafted, and exhibits excellent characteristics of transparency, gloss, impact resistance, and chemical resistance.

In addition, the styrene-based monomer may be styrene, α-methylstyrene, or p-methylstyrene, but the type is not limited. In addition, the styrene-based monomer and acrylonitrile may be included in a weight ratio of 50:50 to 20:80, and may be directly synthesized according to a generally well-known synthesis method, or commercially available products may be obtained and used.

In addition, the styrene-acrylonitrile copolymer may have a melt index (MI) of 5 to 20 g/10min, measured at 230°C with a load of 3.8 kg according to ASTM D1238, and has excellent processability and balance of properties within this range. Has an excellent effect.

In addition, the styrene-acrylonitrile copolymer may have a weight average molecular weight (Mw) of 130,000 to 150,000 g/mol, and within the above range, the impact strength is excellent and fluidity is good, so that excellent processability can be obtained.

The styrene-acrylonitrile copolymer may be included in an amount of 20 to 30% by weight, more specifically 20 to 25% by weight, based on the total weight of the polycarbonate-based resin composition. When the content of the styrene-acrylonitrile copolymer is 20% by weight or less, there is a problem that the moldability is deteriorated, and when it is 30% by weight or more, there is a problem that the impact strength is decreased. In addition, when the content of the styrene-acrylonitrile copolymer is 20 to 25% by weight, it can be optimized to simultaneously improve moldability and impact strength.

(c) methyl methacrylate-butadiene copolymer

The methyl methacrylate-butadiene copolymer (MB) is an impact modifier used in place of the existing ABS or MBS. By specifying the content of each component at an optimal composition ratio, light resistance, scratch resistance, and mechanical properties are improved, while deeper It is possible to implement black color, so it has an effect that can be applied to various fields.

The methyl methacrylate-butadiene copolymer is a copolymer resin in which methyl methacrylate is grafted onto a butadiene rubbery polymer exhibiting impact resistance and heat resistance.

The butadiene rubber polymer is not limited in its composition, but diene-based rubbers such as polybutadiene, polystyrene-butadiene, and polyacrylonitrile-butadiene; And saturated rubber obtained by adding hydrogen to the diene rubber. Acrylic rubbers such as C1-C8 alkyl acrylate, polybutylacrylate, and ethylhexyl acrylate; Isoprene rubber; Chloroprene rubber; Ethylene-Propylene (EPM) rubber; And one or more selected from the group consisting of ethylene-propylene-diene (EPDM) rubber may be used, and among them, polybutadiene rubber may be used.

The methyl methacrylate-butadiene copolymer may include 20 to 40% by weight or 20 to 30% by weight of methyl methacrylate (MMA) with respect to the entire copolymer. When the content of methyl methacrylate in the copolymer is 20% by weight or less, there is a problem in that light resistance and scratch resistance are inferior, and when it is 40% by weight or more, there is a problem that impact strength is inferior. In addition, when the methyl methacrylate content is 20 to 30% by weight in the methyl methacrylate-butadiene copolymer, better light resistance, scratch resistance, and impact strength may be improved.

In addition, the methyl methacrylate-butadiene copolymer may be directly synthesized according to a generally well-known synthesis method, or a commercially available product having the methyl methacrylate content may be obtained and used.

In addition, the methyl methacrylate-butadiene copolymer may have a weight average molecular weight (Mw) of 200,000 to 300,000 g/mol, and has excellent impact strength and good fluidity within the above range, thereby obtaining excellent processability.

The methyl methacrylate-butadiene copolymer may be included in an amount of 4 to 10% by weight, more specifically 4 to 8% by weight, based on the total weight of the polycarbonate-based resin composition. When the content of the methyl methacrylate-butadiene copolymer is 4% by weight or less, there is a problem that the impact strength is lowered, and when it is 10% by weight or more, there is a problem that the moldability is lowered and heat resistance is poor. In addition, when the content of the methyl methacrylate-butadiene copolymer is 4 to 8% by weight, it can be optimized to simultaneously improve moldability and heat resistance.

(d) polybutylene terephthalate

Further, the polycarbonate-based resin composition of the present invention can further improve light resistance by further including a small amount of polybutylene terephthalate (PBT) resin.

The polybutylene terephthalate is a polyester resin excellent in chemical resistance, heat aging resistance (maintains good mechanical properties even at high temperatures), mechanical properties, and electrical insulation.

However, if the content is included in an excessive amount, it may be problematic when used as a connector material around an automobile engine that requires high-temperature heat resistance due to insufficient impact resistance and heat resistance, so it is recommended to appropriately control the content.

Preferably, the polycarbonate-based resin composition of the present invention may further contain 3 to 8% by weight of polybutylene terephthalate, more preferably 3 to 5% by weight, based on the total weight of the total resin composition. When the content of the polybutylene terephthalate is 3% by weight or less, the effect of improving light resistance is deteriorated, and when the content of the polybutylene terephthalate is less than 8% by weight, there is a problem that the thermal deformation temperature and impact strength physical properties are significantly decreased. In addition, when the content of the polybutylene terephthalate is 3 to 5% by weight, it can be optimized to simultaneously improve light resistance, heat deflection temperature, and impact strength properties.

The polybutylene terephthalate is a polymer obtained by condensation polymerization through a direct esterification reaction or transesterification reaction using 1,4-butanediol and terephthalic acid or dimethyl terephthalate as monomers. In addition, the polybutylene terephthalate may be directly synthesized according to a generally well-known synthesis method or may be used by obtaining a commercially available product.

The polybutylene terephthalate may have an intrinsic viscosity of 0.8 to 1.2 or 0.98 to 1.02 dl/g.

(e) Other additives

The polycarbonate-based resin composition according to an embodiment of the present invention may further include one or more additives such as a heat stabilizer, an inorganic filler, a lubricant, a UV stabilizer, an antioxidant, a dye, a pigment, and a colorant, if necessary. have.

The content of the additive may be appropriately adjusted with respect to the total weight of the total resin composition in the polycarbonate-based resin composition of the present invention, and for example, may be included in an amount of 0.1 to 5 parts by weight based on the total weight of the total resin composition.

The antioxidant may include a phenolic antioxidant, a phosphite antioxidant, or a thioether antioxidant, and any one or a mixture of two or more of them may be used. Among these, at least one of a phenol-based antioxidant and a phosphite-based antioxidant may be used in consideration of excellent compatibility with the constituents of the polycarbonate-based resin composition and the effect of improving mechanical properties.

As the phenolic antioxidant, tetrakis methylene 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methane, 1,3,5-tris-(4-t-butyl-3 -Hydroxy-2,6-dimethylbenzel)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione and 1,3,5-tris-(3,5 -Di-t-butyl-4-hydroxybenzyl)-s-triazine-2,4,6-(1H,3H,5H)-trione, etc., and other commercially available IR1076 (Ciba Geigy Priest), etc. may be used. In addition, as the phosphite-based antioxidant, trisnonylphenylphosphite, tris-(2,4-di-tert-butylphenyl)phosphite, or bis(2,4-di-tert-butylphenyl)pentaeryth Lithol diphosphite, etc. may be mentioned, and other commercially available IF 168 (manufactured by BASF) and the like may be used.

In addition, the inorganic filler may include metal powder, glass fiber, carbon black, carbon fiber, clay, mica, talc, wollastonite, or mica, and any one or a mixture of two or more of them Can be used. Among them, carbon black, carbon fiber, or glass fiber may be used as the inorganic filler in consideration of excellent compatibility with the constituents of the polycarbonate resin composition and the effect of improving mechanical properties. The inorganic filler may be included in an amount of 0.1 to 10 parts by weight, more specifically 3 to 8 parts by weight, based on 100 parts by weight of the total content of polycarbonate and styrene resin in the polycarbonate-based resin composition. When included in the above content range, it may exhibit a better mechanical property improvement effect.

Examples of the lubricant include mineral oil, hydrocarbons, fatty acids, alcohols, fatty acid esters, fatty acid amides, metal soaps, natural waxes, silicones, and the like, and any one or a mixture of two or more thereof may be used.

The additives can be appropriately mixed while mixing the components for forming the composition, and by including one or more additives in the polycarbonate-based resin composition, one or more types of the polycarbonate-based resin composition and the molded article manufactured therefrom Additive properties can be given.

In addition, according to another embodiment of the present invention, a molded article including the polycarbonate-based resin composition may be provided.

The polycarbonate-based resin composition according to an embodiment of the present invention having the above composition exhibits excellent light resistance, scratch resistance, and blackness, as well as improving mechanical properties such as impact resistance, so that a deep black color can be realized. It can provide an effect.

Accordingly, even a molded article manufactured using the resin composition has excellent appearance as well as excellent mechanical properties and can implement a deep black color. Therefore, the molded article using the polycarbonate resin composition can be applied to various fields such as automobiles, OA electronic devices, and electric electronic devices, especially when applied to various parts of automobiles such as centerfacia, air-vent bezel, and garnish. , Can improve scratch resistance.

It is an article obtained by molding the molded article by a method such as extrusion, injection or casting using the above-described polycarbonate resin composition as a raw material. The molding method and conditions may be appropriately selected and adjusted according to the type of the molded article. For example, the molded article may be prepared by mixing and extrusion molding the polycarbonate-based resin composition into pellets, and then drying the pellets and then injecting them.

As the molded article is formed from the polycarbonate-based resin composition, friction noise decreases and has excellent appearance characteristics, and may be automobiles, OA electronic devices, electric electronic devices, etc., and in particular, centerfacia, air vent bezel ( Air-vent bezel), Garnish, etc. may be automobile parts.

Hereinafter, preferred embodiments are presented to aid understanding of the invention. However, the following examples are only for illustrating the present invention, and the present invention is not limited thereto.

Materials used in the following Examples and Comparative Examples are as follows:

1. Polycarbonate resin (PC) (LG PC, 1300-15), melt index 15 g/10 min (ASTM D1238, 300℃, 1.2 Kgf)

2. Acrylonitrile-butadiene-styrene copolymer (ABS) (LG ABS, DP270E)

3. Acrylonitrile-Styrene Copolymer (SAN) (LG SAN, 80HF)

4. Methyl methacrylate-butadiene-styrene copolymer (MBS) (LG MBS EM500)

5. Methyl methacrylate-butadiene-copolymer (MB) (LG MB EM520)

6. Acrylonitrile-styrene-acrylate copolymer (ASA) (LG ASA SA927)

7. Polymethylmethacrylate (PMMA) (LG PMMA, IH830)

8. Silicone impact modifier (MRC, S2001)

9. Polybutylene terephthalate (PBT) (Changchun PBT, 1100-211M)

10. Additive: 1% by weight of a mixture of 0.4% by weight of a heat stabilizer, 0.3% by weight of a lubricant, and 0.3% by weight of a UV stabilizer is used

Examples 1 to 3 and Comparative Examples 1 to 7

After mixing with a super mixer using the components and contents shown in Table 1 below, melt-kneading was performed at a temperature range of 220 to 280°C using a twin-screw extruder. After pelletizing through extrusion processing, dried at 100° C. for 2 hours or more, and injection-molded to prepare a specimen. The prepared specimens were allowed to stand at room temperature for 1 day and then used for evaluation of physical properties in the following experimental examples. In Table 1, the content unit is% by weight.

division Example Comparative example One 2 3 One 2 3 4 5 6 7 PC 70 70 66 70 70 70 70 50 70 70 SAN 23 21 23 23 23 23 23 23 26 17 Shock
Reinforcement
MB 6 8 6 3 12 ABS 6 6 MBS 6 Silicone 2 ASA 6 4 PMMA 20 PBT 4 additive One One One One One One One One One One Total (Unit: wt%) 100 100 100 100 100 100 100 100 100 100

Experimental example: property evaluation

For the polycarbonate-based resin compositions prepared in the Examples and Comparative Examples, physical property evaluation was performed in the following manner, and the results are shown in Table 2 below.

1) Melt Index: Measured at 250°C, 2.16kg load according to ASTM D1238.

2) Tensile strength: Measured according to ASTM D638.

3) Flexural strength: It was measured according to ASTM D790.

4) Flexural modulus: Measured according to ASTM D790.

5) Izod strength (23°C, -10°C): Izod strength at each temperature was measured according to ASTM D256.

6) HDT (°C): It was measured according to ASTM D648.

7) Scratch resistance (ΔL): It was measured using the Ericshen test.

8) Color (L*): Lightness value L* was measured using a colormeter device.

<Color evaluation criteria>

The lower the L*, the darker black color

Light resistance (ΔE): It was measured based on SAE J1885 (700KJ).

division Example Comparative example One 2 3 One 2 3 4 5 6 7 Melt index
(g/10min) 4.5 4.1 4.8 4.6 4.8 5.0 5.0 5.3 5.2 3.7 Tensile strength (MPa) 55 52 55 54 53 55 54 54 57 49 Flexural strength (MPa) 84 82 84 84 83 84 83 84 86 78 Flexural modulus (MPa) 2,230 2,120 2,250 2,180 2,150 2,200 2,180 2,230 2,350 1,830 Izod strength
(23℃, J/m) 440 440 440 450 440 420 430 380 450 480 Izod strength (-10℃, J/m) 290 340 280 298 293 170 190 180 160 350 HDT(℃) 113 111 112 113 112 114 114 105 115 106 Scratch resistance (ΔL) ¹⁾ 4.5 3.5 4.5 6.2 8.3 5.8 5.8 2.3 6.5 3.7 Color (L*) ²⁾ 5.3 5.5 5.0 6.0 5.0 8.2 9.0 7.0 4.8 7.1 Light fastness (ΔE) ³⁾ 0.7 0.8 0.4 1.0 3.2 0.4 0.5 1.3 0.4 3.8 week)
1) Ericshen test: The lower the ΔL value, the better the scratch resistance.
2) L*: lightness value, the lower the value, the better the black feeling
3) Color color change

Through the results of Table 2, the carbonate-based resin compositions of Examples 1 to 3 having a resin composition according to the present invention exhibited mechanical properties equal to or higher than the results of Comparative Examples 1 to 7, and in particular, scratch resistance, black Both degrees and light resistance showed improved effects.

On the other hand, Comparative Examples 1 to 7 had poor scratch resistance, blackness, and light resistance, even though they had excellent mechanical properties. In particular, in the case of Comparative Example 2, light resistance and scratch resistance were decreased by using an ABS resin as an impact modifier, and in Comparative Example 5, light resistance and scratch resistance were improved by adding PMMA, but it was difficult to implement a deep black color and heat resistance and impact resistance. This was bad.

Claims (9)

60 to 70% by weight of polycarbonate,
20 to 30% by weight of a styrene-acrylonitrile copolymer, and
Methyl methacrylate-butadiene copolymer 4 to 10% by weight
Containing a polycarbonate resin composition.
The method of claim 1,
The methyl methacrylate-butadiene copolymer is a polycarbonate-based resin composition comprising 20 to 40% by weight of methyl methacrylate based on the total copolymer.
The method of claim 1,
The polycarbonate is an aromatic polycarbonate prepared by polymerization of an aromatic diol-based compound and a carbonate precursor, a polycarbonate-based resin composition.
The method of claim 1,
The polycarbonate has a melt flow index (MFRR) (300°C, 1.2kg) of 10 to 50 g/10min measured according to ASTM D1238, and a density of 0.8 to 1.5 g/cm 3 measured according to ASTM D792. System resin composition.
The method of claim 1,
The styrene-acrylonitrile copolymer has a melt index (MI) of 10 to 30 g/10min measured at 230° C. with a load of 3.8 kg according to ASTM D1238, a polycarbonate-based resin composition.
The method of claim 1,
Polycarbonate-based resin composition further comprising 3 to 8% by weight of polybutylene terephthalate based on the total weight of the total resin composition.
The method of claim 6,
The polybutylene terephthalate has an intrinsic viscosity of 0.8 to 1.2 dl/g, a polycarbonate resin composition.
The method of claim 1,
The polycarbonate-based resin composition further comprises at least one additive selected from the group consisting of a heat stabilizer, an inorganic filler, a lubricant, a UV stabilizer, an antioxidant, a dye, a pigment, and a colorant.
A molded article comprising the polycarbonate resin composition of any one of claims 1 to 8.