KR20190082073A - Thermoplastic resin composition and molded article using the same - Google Patents

Abstract

The present invention relates to a thermoplastic resin composition comprising, with respect to 100 parts by weight of a basic resin including 50 to 70 wt% of a polycarbonate resin (A-1) and 30 to 50 wt% of a rubber modified vinyl-based copolymer (A-2), 1 to 3 parts by weight of a cross-linking styrene-acrylonitrile copolymer (B) and 1 to 3 parts by weight of a methyl methacrylate-butyl acrylate copolymer (C). The thermoplastic resin composition of the present invention has excellent impact resistance and appearance uniformity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition and a molded article using the thermoplastic resin composition.

A thermoplastic resin composition and a molded article using the same.

Polycarbonate resin is one of the engineering plastics that is widely used in the plastics industry.

The polycarbonate resin has a glass transition temperature (Tg) of about 150 DEG C due to a bulk molecular structure such as bisphenol-A, exhibits a high heat resistance, and the carbonyl group of the carbonate group has high flexibility, And rigidity. It is also an amorphous polymer and has excellent transparency.

In addition, it has excellent impact resistance and compatibility with other resins. However, since polycarbonate resin has a disadvantage of low fluidity, it is often used as an alloy form with various resins in order to complement workability and post-processability do.

 Among these, polycarbonate / acrylonitrile-butadiene-styrene copolymer (PC / ABS) is superior in durability, formability, heat resistance and impact resistance, and is widely used in the fields of electric / electronic, automobile, Is applied to the field.

In recent years, a material having a relatively low gloss characteristic has been demanded in order to realize a luxurious feeling depending on a material application site. However, PC / ABS alloys generally achieve high gloss. As a method for lowering the gloss characteristic, a method of increasing the particle size of the rubbery polymer or applying a quencher or the like has been attempted, but the uniformity of the appearance may be lowered.

Accordingly, there is a need to develop a thermoplastic resin composition which can maintain low light properties and appearance uniformity while maintaining excellent durability, moldability, heat resistance, and impact resistance as compared with conventional PC / ABS alloys.

To provide a thermoplastic resin composition excellent in impact resistance and appearance uniformity and having low light properties, and a molded article using the same.

According to one embodiment, 100 parts by weight of a base resin comprising 50 to 70% by weight of (A-1) a polycarbonate resin and 30 to 50% by weight of a rubber-modified vinyl copolymer (A-2) ) 1 to 3 parts by weight of a crosslinked styrene-acrylonitrile copolymer; And (C) 1 to 3 parts by weight of a methyl methacrylate-butyl acrylate copolymer.

The rubber-modified vinyl copolymer (A-2) is preferably an acrylonitrile-butadiene-styrene graft copolymer having an average particle diameter of 200 nm to 400 nm of the butadiene rubber-like polymer (A-2-1) 2-2) an acrylonitrile-butadiene-styrene copolymer having an average particle diameter of the butadiene rubber-like polymer of 400 nm to 1,000 nm.

The acrylonitrile-butadiene-styrene graft copolymer (A-2-1) may include a core composed of a butadiene rubber-like polymer and a shell formed by graft-polymerizing a styrene-acrylonitrile copolymer to the core. have.

The core may be contained in an amount of 40 to 50% by weight based on 100% by weight of the (A-2-1) acrylonitrile-butadiene-styrene graft copolymer.

The (A-2-2) acrylonitrile-butadiene-styrene copolymer is a copolymer of a core-shell having a core formed of a butadiene-based rubbery polymer and a shell formed by graft-polymerizing a styrene- acrylonitrile copolymer to the core Structure and a styrene-acrylonitrile copolymer continuous phase.

The core may be contained in an amount of 10 to 15% by weight based on 100% by weight of the (A-2-2) acrylonitrile-butadiene-styrene copolymer.

The (B) crosslinkable styrene-acrylonitrile copolymer may have a weight average molecular weight of 1,000,000 g / mol to 9,000,000 g / mol.

The (C) methyl methacrylate-butyl acrylate copolymer may have a weight average molecular weight of 1,000,000 g / mol to 5,000,000 g / mol.

The (C) methyl methacrylate-butyl acrylate copolymer may be a copolymer of a monomer mixture containing 60 to 90% by weight of methyl methacrylate and 10 to 40% by weight of butyl acrylate.

Meanwhile, a molded article using the thermoplastic resin composition according to one embodiment can be provided.

The thermoplastic resin composition and the molded article using the thermoplastic resin composition according to one embodiment are excellent in impact resistance and appearance uniformity and can be widely applied to molding various products used in painting and unpainted materials due to their low light properties, And can be usefully used for applications.

1 and 2 show the appearance evaluation standards of a molded product specimen produced using the thermoplastic resin composition according to one embodiment. Fig. 1 shows the appearance of a specimen having "good" appearance uniformity, Fig. 2 shows the appearance uniformity It is an image of the appearance of a Psalm with a surname of "Poor".

Hereinafter, embodiments of the present invention will be described in detail. However, it should be understood that the present invention is not limited thereto, and the present invention is only defined by the appended claims.

In the present invention, unless otherwise stated, the average particle diameter means a volume average diameter, which means a Z-average particle diameter measured using a dynamic light scattering analyzer.

According to one embodiment, 100 parts by weight of a base resin comprising 50 to 70% by weight of a (A-1) polycarbonate resin and 30 to 50% by weight of a rubber-modified vinyl copolymer (A-2) ) 1 to 3 parts by weight of a crosslinked styrene-acrylonitrile copolymer; And (C) 1 to 3 parts by weight of a methyl methacrylate-butyl acrylate copolymer.

Hereinafter, each component contained in the thermoplastic resin composition will be described in detail.

(A) Base resin

(A-1) Polycarbonate resin

The polycarbonate resin is a polyester having a carbonate bond and the kind thereof is not particularly limited, and any polycarbonate resin usable in the resin composition field can be used.

For example, it can be produced by reacting a diphenol represented by the following formula (1) with a compound selected from the group consisting of phosgene, a halogen acid ester, a carbonic ester and a combination thereof.

[Chemical Formula 1]

In Formula 1,

A represents a single bond, a substituted or unsubstituted C1 to C30 alkylene group, a substituted or unsubstituted C2 to C5 alkenylene group, a substituted or unsubstituted C2 to C5 alkylidene group, a substituted or unsubstituted C1 to C30 haloalkyl A substituted or unsubstituted C5 to C6 cycloalkylene group, a substituted or unsubstituted C5 to C6 cycloalkenylene group, a substituted or unsubstituted C5 to C10 cycloalkylidene group, a substituted or unsubstituted C6 to C30 arylene group , A substituted or unsubstituted C1 to C20 alkoxysilyl group, a halogen acid ester group, a carbonate ester group, CO, S and SO ₂ , R ¹ and R ² each independently represent a substituted or unsubstituted A substituted or unsubstituted C6 to C30 aryl group, and n1 and n2 each independently represent an integer of 0 to 4;

The diphenols represented by the above formula (1) may be composed of two or more of them to form a repeating unit of a polycarbonate resin.

Specific examples of the diphenols include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxyphenyl) propane (also referred to as bisphenol- (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis Propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis Bis (3,5-dibromo-4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfoxide, Bis (4-hydroxyphenyl) ketone, and bis (4-hydroxyphenyl) ether. Among the above diphenols, preferred are 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3-methyl- Dimethyl (4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane or 1,1-bis (4-hydroxyphenyl) cyclohexane. More preferably, 2,2-bis (4-hydroxyphenyl) propane can be used.

The polycarbonate resin may be a mixture of copolymers prepared from two or more diphenols.

The polycarbonate resin may be a linear polycarbonate resin, a branched polycarbonate resin, or a polyester carbonate copolymer resin.

A specific example of the linear polycarbonate resin may be a bisphenol-A polycarbonate resin. Specific examples of the branched polycarbonate resin may be a resin prepared by reacting a polyfunctional aromatic compound such as trimellitic anhydride, trimellitic acid and the like with a diphenol and a carbonate. The polyester carbonate copolymer resin may be prepared by reacting a bifunctional carboxylic acid with a diphenol and a carbonate. The carbonate used herein may be a diaryl carbonate such as diphenyl carbonate or ethylene carbonate.

The polycarbonate resin may be contained in an amount of 50 wt% to 70 wt%, for example, 55 wt% to 70 wt%, for example, 60 wt% to 70 wt%, based on 100 wt% of the base resin. When the polycarbonate resin is less than 50% by weight, the appearance characteristics are poor. When the polycarbonate resin is more than 70% by weight, the mechanical strength may be lowered.

The polycarbonate resin preferably has a weight average molecular weight of 10,000 g / mol to 200,000 g / mol, for example, 14,000 g / mol to 40,000 g / mol. When the weight average molecular weight of the polycarbonate resin is within the above range, excellent impact resistance and fluidity can be obtained. Further, two or more kinds of polycarbonate resins different in weight average molecular weight or flow index may be mixed and used in order to satisfy desired fluidity.

(A-2) a rubber-modified vinyl copolymer

The rubber-modified vinyl-based copolymer according to one embodiment may include a butadiene-based rubber-like polymer and a vinyl-based copolymer.

The butadiene rubber-like polymer may be selected from the group consisting of a polybutadiene rubber, a butadiene-styrene copolymer rubber, a butadiene-acrylonitrile copolymer rubber, or a combination thereof.

The vinyl-based copolymer may be an aromatic vinyl monomer, an acrylic monomer, or a combination thereof, and a monomer capable of copolymerizing with the aromatic vinyl monomer may further be used.

As the aromatic vinyl monomer, styrene, C1 to C10 alkyl-substituted styrene, halogen-substituted styrene, or a combination thereof may be used. Specific examples of the alkyl-substituted styrene include o-ethylstyrene, m-ethylstyrene, p-ethylstyrene, and -methylstyrene.

The monomer copolymerizable with the aromatic vinyl monomer may be a vinyl cyanide monomer, an acrylic monomer, a heterocyclic monomer, or a combination thereof.

As the vinyl cyanide monomer, acrylonitrile, methacrylonitrile, fumaronitrile, or a combination thereof may be used.

As the acrylic monomer, alkyl (meth) acrylate, (meth) acrylic acid ester, or a combination thereof may be used. Wherein said alkyl means C1 to C10 alkyl. Specific examples of the (meth) acrylic acid alkyl ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate and butyl (meth) acrylate.

The rubber-modified vinyl-based copolymer is contained in an amount of, for example, 30 wt% to 50 wt%, for example, 30 wt% to 45 wt%, for example, 30 wt% to 40 wt% .

When the rubber-modified vinyl copolymer is contained in an amount of less than 30% by weight based on the base resin, there is a problem that the impact resistance of the thermoplastic resin composition is deteriorated. When the vinyl copolymer exceeds 50% by weight, heat resistance is deteriorated.

Specific examples of the rubber-modified vinyl-based copolymer in one embodiment include a core-shell acrylic resin having a core composed of a butadiene-based rubbery polymer and a shell formed by graft-polymerizing a styrene-acrylonitrile copolymer to the core Nitrile-butadiene-styrene graft copolymer (A-2-1).

Another example of the rubber-modified vinyl copolymer includes a core-shell structure dispersed phase comprising a core composed of a butadiene rubber-like polymer and a shell formed by graft-polymerizing a styrene-acrylonitrile copolymer to the core, and a styrene- Acrylonitrile-butadiene-styrene copolymer (A-2-2) containing a nitrile copolymer continuous phase.

The rubber-modified vinyl copolymer may include the acrylonitrile-butadiene-styrene graft copolymer, the acrylonitrile-butadiene-styrene copolymer, or a combination thereof. In one embodiment, the rubber-modified vinyl-based copolymer may comprise the acrylonitrile-butadiene-styrene graft copolymer and the acrylonitrile-butadiene-styrene copolymer.

The acrylonitrile-butadiene-styrene graft copolymer and the acrylonitrile-butadiene-styrene copolymer may have a core-shell structure as described above. The butadiene-based rubbery polymer component constituting the core improves the impact strength particularly at low temperatures, and the shell component can lower the interfacial tension to reduce the size of the rubbery polymer particles in the dispersed phase and improve the adhesion at the interface.

In one embodiment, the acrylonitrile-butadiene-styrene graft copolymer (A-2-1) and the acrylonitrile-butadiene-styrene copolymer (A-2-2) contained in the rubber- Butadiene-based rubbery polymer and the shell forming method.

First, the acrylonitrile-butadiene-styrene graft copolymer (A-2-1) is prepared by adding styrene and acrylonitrile to a butadiene-based rubbery polymer and subjecting the mixture to graft copolymerization through emulsion polymerization, bulk polymerization, ≪ / RTI > That is, the acrylonitrile-butadiene-styrene graft copolymer (A-2-1) includes a core composed of a butadiene rubber-like polymer and a shell formed by graft-polymerizing a styrene- acrylonitrile copolymer to the core The core-shell structure of the graft copolymer.

The acrylonitrile-butadiene-styrene graft copolymer (A-2-1) may be prepared by copolymerizing a butadiene-based rubbery polymer having an average particle size of, for example, 200 nm to 400 nm, for example, 200 nm to 350 nm, nm to 350 nm.

The acrylonitrile-butadiene-styrene graft copolymer (A-2-1) may be used in an amount of, for example, 3 wt% to 20 wt%, for example, 5 wt% to 20 wt% , For example from 5% to 15% by weight.

The butadiene rubber polymer may be contained in an amount of 40% by weight to 50% by weight based on 100% by weight of the acrylonitrile-butadiene-styrene graft copolymer (A-2-1). Meanwhile, the shell of the acrylonitrile-butadiene-styrene graft copolymer (A-2-1) may be copolymerized with styrene and acrylonitrile in a weight ratio of 8: 2 to 6: 4.

When the acrylonitrile-butadiene-styrene graft copolymer (A-2-1) is contained in an amount of less than 3% by weight of the base resin, the impact resistance of the thermoplastic resin composition is lowered. There is a problem that the heat resistance is deteriorated.

On the other hand, the acrylonitrile-butadiene-styrene copolymer (A-2-2) comprises a core composed of a butadiene-based rubbery polymer and a shell formed by graft-polymerizing a styrene- acrylonitrile copolymer to the core. - shell structure and a styrene-acrylonitrile copolymer continuous phase.

The acrylonitrile-butadiene styrene copolymer (A-2-2) may be prepared by copolymerizing the butadiene-based rubbery polymer with an average particle size of, for example, 300 nm to 1,000 nm, for example, 400 nm to 1,000 nm, For example from 400 nm to 700 nm, for example from 450 nm to 700 nm, for example from 500 nm to 700 nm.

The acrylonitrile-butadiene-styrene copolymer (A-2-2) is, for example, 10 to 30% by weight, for example, 15 to 30% by weight, based on 100% To 20% by weight to 30% by weight.

The butadiene rubber-like polymer may be contained in an amount of 10 to 15% by weight based on 100% by weight of the acrylonitrile-butadiene-styrene copolymer (A-2-2). The weight average molecular weight of the styrene-acrylonitrile copolymer constituting the continuous phase may be, for example, 150,000 g / mol to 250,000 g / mol, for example, 170,000 g / mol to 230,000 g / mol.

When the acrylonitrile-butadiene-styrene copolymer (A-2-2) is contained in an amount of less than 10% by weight relative to the thermoplastic resin composition, the impact resistance of the thermoplastic resin composition is lowered, and when the thermoplastic resin composition is used, There is a problem that the effect is lowered, and when it is contained in an amount exceeding 30% by weight, heat resistance is deteriorated.

(B) a crosslinked styrene-acrylonitrile copolymer

The crosslinked styrene-acrylonitrile copolymer may be a substance having an ultrahigh molecular weight in which the styrene-acrylonitrile copolymer forms a crosslinking bond. The crosslinked styrene-acrylonitrile copolymer improves the compatibility between the polycarbonate resin and the rubber-modified vinyl copolymer, and improves the extinction effect of the molded article by imparting irregularities to the surface of the molded article during the production of the molded article with the thermoplastic resin composition . Accordingly, it is possible to provide a thermoplastic resin having excellent extrusion moldability and a molded article made of the thermoplastic resin and having improved low light properties.

The crosslinked styrene-acrylonitrile copolymer has a weight average molecular weight of, for example, from 1,000,000 g / mol to 10,000,000 g / mol, such as from 2,000,000 g / mol to 8,000,000 g / mol, such as from 3,000,000 g / g / mol, for example from 3,000,000 g / mol to 10,000,000 g / mol, for example from 4,000,000 g / mol to 6,000,000 g / mol.

When the weight average molecular weight of the cross-linked styrene-acrylonitrile copolymer is out of the above range, compatibility between the polycarbonate resin and the rubber-modified vinyl copolymer may deteriorate and the extrusion moldability may be deteriorated.

The crosslinked styrene-acrylonitrile copolymer is used in an amount of, for example, not more than 20 parts by weight, for example, not less than 0 parts by weight and not more than 18 parts by weight, for example, not less than 0 parts by weight and not more than 15 parts by weight, for example, 0 For example, from 1 part to 10 parts by weight, for example from 1 part by weight to 8 parts by weight, for example from 1 to 5 parts by weight have.

When the content of the crosslinkable styrene-acrylonitrile copolymer is within the above range, the compatibility between the polycarbonate resin and the rubber-modified vinyl copolymer is improved, and the extrusion moldability of the thermoplastic resin according to one embodiment can be improved have.

(C) Methyl methacrylate-butyl acrylate copolymer

The methyl methacrylate-butyl acrylate copolymer improves the compatibility between components constituting the thermoplastic resin composition, so that the molded article can have a uniform appearance at the time of producing the molded article with the thermoplastic resin composition.

The methyl methacrylate-butyl acrylate copolymer may be a copolymer of a monomer mixture containing 60 to 90% by weight of methyl methacrylate and 10 to 40% by weight of butyl acrylate. When the content of the methyl methacrylate and butyl acrylate monomer constituting the methyl methacrylate-butyl acrylate copolymer is in the above range, the compatibility of the polycarbonate resin and the rubber-modified vinyl copolymer can be improved.

The methyl methacrylate-butyl acrylate copolymer may have a weight average molecular weight of 1,000,000 to 5,000,000 g / mol, preferably 1,200,000 to 4,000,000 g / mol, more preferably 1,500,000 to 3,000,000 g / mol . When the weight average molecular weight of the methyl methacrylate-butyl acrylate copolymer is within the above range, the morphology between the constituent components becomes stable without deteriorating the fluidity of the resin composition in the shear rate range during injection molding.

The methyl methacrylate-butyl acrylate copolymer may be included in an amount of 1 to 3 parts by weight, preferably 1 to 2 parts by weight based on 100 parts by weight of the base resin. When the amount of the methyl methacrylate-butyl acrylate copolymer is less than 1 part by weight, the compatibility of the polycarbonate resin with the rubber-modified vinyl copolymer is poor. When the amount is more than 3 parts by weight, .

(D) Other additives

The thermoplastic resin composition may further include additives in accordance with the use thereof. The additive may further include a flame retardant, a lubricant, a plasticizer, a heat stabilizer, an antioxidant, a light stabilizer or a colorant, and may be used in a mixture of two or more kinds depending on the properties of the final molded product.

The flame retardant is a material that reduces combustibility and may be a phosphate compound, a phosphite compound, a phosphonate compound, a polysiloxane, a phosphazene compound, a phosphinate compound or a melamine compound But it is not limited thereto.

The lubricant is a material that lubricates a metal surface contacting with the thermoplastic resin composition during processing / molding / extrusion to aid flow or movement of the thermoplastic resin composition, and a commonly used material can be used.

The plasticizer is a material which increases the flexibility, workability or extensibility of the thermoplastic resin composition, and a commonly used material can be used.

The heat stabilizer is a substance which inhibits thermal decomposition of the thermoplastic resin composition when kneaded or molded at a high temperature, and a commonly used material can be used.

The antioxidant is a substance that prevents the thermoplastic resin composition from being degraded and loss of its inherent properties by inhibiting or blocking the chemical reaction between the thermoplastic resin composition and oxygen. The antioxidant may be a phenol type, phosphite type, thioether type or amine type antioxidant But it is not limited thereto.

The light stabilizer is a substance that inhibits or blocks the loss of color or mechanical properties of the thermoplastic resin composition from ultraviolet rays. Preferably, the light stabilizer is at least one of hindered phenol type, benzophenone type or benzotriazole type light stabilizer But is not limited thereto.

Conventional pigments or dyes may be used as the colorant.

The additive may be included in an amount of 0.1 to 15 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 thermoplastic resin composition.

For example, the thermoplastic resin composition according to the present invention can be produced in the form of pellets by mixing the constituents of the present invention and other additives simultaneously, followed by melt-kneading in an extruder.

The molded article according to one embodiment of the present invention can be produced from the above-mentioned thermoplastic resin composition. The thermoplastic resin composition is excellent in chemical resistance, heat resistance and impact resistance, is excellent in moldability and can be applied to any molded article requiring resistance to chemicals. When the composition is used for automobile interior materials, The appearance can be realized.

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

Examples 1 to 2 and Comparative Examples 1 to 5

The polycarbonate resin compositions of Examples 1 to 2 and Comparative Examples 1 to 5 were produced in accordance with the component content ratios described in Table 1 below.

In Table 1, the constituent elements constituting the base resin are represented by weight% based on the total weight of the base resin, and the crosslinked styrene-acrylonitrile copolymer and methyl methacrylate-butyl acrylate copolymer In the case of coalescence, it is expressed in parts by weight with respect to 100 parts by weight of the base resin.

On the other hand, in the comparative examples in Table 1, the styrene-acrylonitrile copolymer (E) is contained in the base resin and is expressed as% by weight based on the total weight of the base resin. (F) Crosslinked polymethyl methacrylate resin Is added to the base resin and expressed in parts by weight with respect to 100 parts by weight of the base resin.

The components listed in Table 1 were dry-mixed and melted / kneaded by continuously feeding them quantitatively to a feeding section of a biaxial extruder (L / D = 38,? = 45 mm). The pelletized thermoplastic resin composition was then dried at about 100 ° C for about 2 hours and then dried by using a 6 oz injection molding machine having a cylinder temperature of about 260 ° C and a mold temperature of about 60 ° C, A specimen for appearance evaluation having a length x thickness of 140 mm x 200 mm x 2.6 mm was injection-molded.

division Example
One Example
2 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Comparative Example
5 (A-1) 65 65 65 65 65 65 65 (A-2-1) 10 10 10 10 10 10 10 (A-2-2) 25 25 0 25 25 25 25 (B) 2 One 0 0 0 One 2 (C) 2 2 0 0 0 0 0 (E) 0 0 25 0 0 0 0 (F) 0 0 0 0 2 0 0

The configurations shown in Table 1 are as follows.

(A) Base resin

(A-1) Polycarbonate resin

Polycarbonate resin having a weight average molecular weight of about 24,000 g / mol (Lotte high-tech material)

(A-2) a rubber-modified vinyl copolymer

(A-2-1) Acrylonitrile-butadiene-styrene graft copolymer

Acrylonitrile-butadiene-styrene graft copolymer (Lotte High-Tech Material) having an average particle size of about 250 nm and a polybutadiene rubber content of about 45% by weight,

(A-2-2) Acrylonitrile-butadiene-styrene copolymer

The polybutadiene rubber core contained in the dispersed phase had an average particle diameter of about 500 nm, a content of polybutadiene rubber core of about 15% by weight, and a styrene-acrylonitrile copolymer having a continuous phase had a weight average molecular weight of about 200,000 g / mol Acrylonitrile-butadiene-styrene copolymer (Lotte high-tech material)

(B) a crosslinked styrene-acrylonitrile copolymer

A crosslinked styrene-acrylonitrile copolymer having a weight average molecular weight of about 5,000,000 g / mol (Chemtura)

(C) Methyl methacrylate-butyl acrylate copolymer

Methyl methacrylate-butyl acrylate copolymer (K-125P, Dow Chemical) having a weight average molecular weight of about 2,000,000 g / mol,

(E) styrene-acrylonitrile copolymer (SAN)

A non-crosslinked styrene-acrylonitrile copolymer having a weight average molecular weight of about 100,000 g / mol (Lotte High-Tech Material)

(F) Crosslinkable polymethylmethacrylate (PMMA) resin

A bead-shaped crosslinked polymethyl methacrylate resin having an average particle diameter of about 5 탆 (Lotte High-Tech Material)

Experimental Example

The experimental results are shown in Table 2 below.

(1) Gloss (GU): The glossiness of the appearance of the specimen was measured by setting the measurement angle to 60 ° in accordance with ASTM D523.

 (2) Impact resistance (kgf * cm / cm): Notched Izod impact strength was measured at room temperature according to ASTM D256 for 1/8 "thick specimens.

(3) Appearance: Appearance of the surface of the specimen for evaluation of appearance having a width of 140 mm x 200 mm x 2.6 mm was visually evaluated. The test specimens having excellent appearance uniformity with no flow mark on the surface of the specimen were evaluated as "good", and flow marks were observed, and specimens having poor appearance uniformity were evaluated as "poor".

1 and 2 show the appearance evaluation standards of a molded product specimen produced using the thermoplastic resin composition according to one embodiment. Fig. 1 shows the appearance of a specimen having "good" appearance uniformity, Fig. 2 shows the appearance uniformity It is an image of the appearance of a Psalm with a surname of "Poor". The portion where the flow mark was observed in the specimen having the appearance uniformity of "defective" was emphasized by the dotted line.

Example
One Example
2 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Comparative Example
5 Glossiness 23 27 48 36 29 27 23 Impact resistance 57 57 57 57 47 57 57 Exterior Good Good Good Bad Good Bad Bad

It can be seen from Tables 1 to 2 and Figs. 1 to 2 that the polycarbonate resin, the rubber-modified vinyl copolymer, the crosslinked styrene-acrylonitrile copolymer, and the methyl methacrylate-butyl acrylate copolymer It can be seen that a homogeneous thermoplastic resin composition having excellent appearance can be realized while ensuring low light properties and excellent impact resistance.

While the present invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes and modifications may be made without departing from the spirit and scope of the following claims. Those skilled in the art will readily understand.

Claims (10)

(A-1) 50 to 70% by weight of a polycarbonate resin, and
(A-2) 100 parts by weight of a base resin containing 30 to 50% by weight of a rubber-modified vinyl copolymer,
(B) 1 to 3 parts by weight of a crosslinked styrene-acrylonitrile copolymer; And
(C) 1 to 3 parts by weight of a methyl methacrylate-butyl acrylate copolymer
And a thermoplastic resin composition. The method of claim 1,
The rubber-modified vinyl copolymer (A-2)
(A-2-1) an acrylonitrile-butadiene-styrene graft copolymer having an average particle diameter of 200 nm to 400 nm of a butadiene rubber-like polymer, and (A-2-2) a butadiene rubber- wherein the thermoplastic resin composition comprises an acrylonitrile-butadiene-styrene copolymer. 3. The method of claim 2,
The acrylonitrile-butadiene-styrene graft copolymer (A-2-1)
A core made of a butadiene-based rubbery polymer, and
And a shell formed by graft-polymerizing a styrene-acrylonitrile copolymer on the core. 4. The method of claim 3,
Wherein the core is contained in an amount of 40 to 50% by weight based on 100% by weight of the (A-2-1) acrylonitrile-butadiene-styrene graft copolymer. 3. The method of claim 2,
The acrylonitrile-butadiene-styrene copolymer (A-2-2)
A core made of a butadiene-based rubbery polymer, and
A thermoplastic resin composition comprising a dispersed phase of a core-shell structure and a styrene-acrylonitrile copolymer continuous phase comprising a shell formed by graft-polymerizing a styrene-acrylonitrile copolymer onto the core. The method of claim 5,
Wherein the core is contained in an amount of 10 to 15% by weight based on 100% by weight of the (A-2-2) acrylonitrile-butadiene-styrene copolymer. The method of claim 1,
The crosslinked styrene-acrylonitrile copolymer (B) has a weight average molecular weight of 1,000,000 g / mol to 10,000,000 g / mol. The method of claim 1,
The thermoplastic resin composition of (C) the methyl methacrylate-butyl acrylate copolymer has a weight average molecular weight of 1,000,000 g / mol to 5,000,000 g / mol. The method of claim 1,
Wherein the methyl methacrylate-butyl acrylate copolymer (C) is a copolymer of a monomer mixture comprising 60% by weight to 90% by weight of methyl methacrylate and 10% by weight to 40% by weight of butyl acrylate. A molded article using the thermoplastic resin composition according to any one of claims 1 to 9.

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