Thermoplastic resin composition and molded article made therefrom

Abstract

The present invention relates to a thermoplastic resin composition and a molded article produced therefrom, the composition comprising, per 100 parts by weight of a base resin comprising (A1) 20 to 40% by weight of a butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer; (A2) 30 to 75% by weight of an aromatic vinyl-vinyl cyanide copolymer; and (B) 5 to 40% by weight of a polyamide resin, (C) 1 to 15 parts by weight of a polyether ester amide block copolymer; and (D) 0.5 to 10 parts by weight of a maleic anhydride-aromatic vinyl-vinyl cyanide copolymer.

Description

[Technical Field]

[0001] The present invention relates to a thermoplastic resin composition and a molded article made therefrom. [Background technology]

[0002] Styrenic resins, such as acrylonitrile-butadiene-styrene copolymer (ABS) resin, are widely used in a variety of applications due to their excellent moldability, mechanical properties, appearance, and secondary processability.

[0003] Molded products made from styrene resins can be widely used in a variety of products that require painting or no painting, such as various interior and exterior materials for automobiles and / or electronic devices.

[0004] Among these, moldings made from styrene resins are sometimes painted as a way to impart aesthetic effects to various interior and exterior materials. While there are no particular limitations on the painting method, electrostatic painting is a commonly used painting method. This type of electrostatic painting involves imparting electrical conductivity to the surface of the molding before painting. To apply electrostatic painting to plastic moldings, which generally have high surface resistance, the surface of the molding must be pre-treated with a conductive primer or other pretreatment.

[0005] Since applying a conductive primer increases the number of processes and manufacturing time, a method has recently been proposed in which a certain level of electrical conductivity is inherent in the molded product itself by further incorporating various conductive materials (e.g., carbon nanotubes) and / or conductivity-enhancing additives into the styrene-based resin.

[0006] However, when a conductive material and / or a conductivity-developing additive is added to a styrene-based resin, the balance of the physical properties of the styrene-based resin may be damaged, resulting in an unexpected deterioration of various physical properties.

[0007] Therefore, there is a current need to develop a thermoplastic resin composition that can maintain a good balance between electrical conductivity and other physical properties. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention provides a thermoplastic resin composition having an excellent balance of electrical conductivity and other physical properties, and a molded article produced from the composition. [Means for solving the problem]

[0009] According to one embodiment, there is provided a thermoplastic resin composition comprising, per 100 parts by weight of a base resin comprising (A1) 20 to 40% by weight of a butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer; (A2) 30 to 75% by weight of an aromatic vinyl-vinyl cyanide copolymer; and (B) 5 to 40% by weight of a polyamide resin, 1 to 15 parts by weight of (C) a polyether ester amide block copolymer; and 0.5 to 10 parts by weight of (D) a maleic anhydride-aromatic vinyl-vinyl cyanide copolymer.

[0010] The (A1) butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer may have a core-shell structure including a core made of a butadiene-based rubber polymer and a shell formed by graft polymerizing an aromatic vinyl compound and a vinyl cyanide compound onto the core.

[0011] The butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer (A1) may have an average particle size of the butadiene-based rubber polymer of 0.2 to 1.0 μm.

[0012] The (A1) butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer may be an acrylonitrile-butadiene-styrene graft copolymer.

[0013] The (A2) aromatic vinyl-vinyl cyanide copolymer can contain, based on 100% by weight, 55 to 80% by weight of a component derived from an aromatic vinyl compound and 20 to 45% by weight of a component derived from a vinyl cyanide compound.

[0014] The aromatic vinyl-cyanide vinyl copolymer (A2) may have a weight average molecular weight of 80,000 to 300,000 g / mol.

[0015] The aromatic vinyl-vinyl cyanide copolymer (A2) may be a styrene-acrylonitrile copolymer.

[0016] The (B) polyamide resin may include polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 4T, polyamide 410, polyamide 510, polyamide 1010, polyamide 1012, polyamide 10T, polyamide 1212, polyamide 12T, polyamide MXD6, or a combination thereof.

[0017] The polyether ester amide block copolymer (C) may be a reaction mixture of an aminocarboxylic acid, lactam or diamine-dicarboxylic acid salt having 6 or more carbon atoms; a polyalkylene glycol; and a dicarboxylic acid having 4 to 20 carbon atoms.

[0018] In the (D) maleic anhydride-aromatic vinyl-vinyl cyanide copolymer, the aromatic vinyl may include styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, dibromostyrene, or a combination thereof, and the vinyl cyanide may include acrylonitrile, methacrylonitrile, fumaronitrile, or a combination thereof.

[0019] The (D) maleic anhydride-aromatic vinyl-vinyl cyanide copolymer may be a maleic anhydride-styrene-acrylonitrile copolymer.

[0020] The thermoplastic resin composition may further include at least one additive selected from a nucleating agent, a coupling agent, a filler, a plasticizer, a lubricant, a mold release agent, an antibacterial agent, a heat stabilizer, an antioxidant, an ultraviolet stabilizer, a flame retardant, a colorant, and an impact modifier.

[0021] Meanwhile, according to another embodiment, there is provided a molded article made from the above-described thermoplastic resin composition.

[0022] The molded article may have a notched Izod impact strength of 20 to 60 kgf·cm / cm for a ¼″ thick test piece according to ASTM D256.

[0023] The molded product was tested using a surface resistance measuring device (manufacturer: SIMCO-ION, device name: Worksurface Tester ST-4) to determine whether the surface resistance of a 100 mm x 100 mm x 20 mm test piece was 10 12.0 It may be Ω / sq or less.

[0024] The molded article may have a heat distortion temperature (HDT) of 80 to 100°C according to ASTM D648. [Effects of the Invention]

[0025] The thermoplastic resin composition according to one embodiment and a molded article using the same exhibit excellent electrical conductivity and a balance of various physical properties, and therefore can be widely applied to the molding of various products to be used with or without painting, and can be particularly usefully applied to molded articles to be painted that require electrostatic painting. DETAILED DESCRIPTION OF THE INVENTION

[0026] DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the present invention is provided by way of example only and is not intended to limit the scope of the present invention, which is defined solely by the appended claims.

[0027] In the present invention, unless otherwise specified, the average particle size is a volume average diameter, and refers to a Z-average particle size measured using a dynamic light scattering analysis device.

[0028] According to one embodiment, there is provided a thermoplastic resin composition comprising, per 100 parts by weight of a base resin comprising (A1) 20 to 40% by weight of a butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer; (A2) 30 to 75% by weight of an aromatic vinyl-vinyl cyanide copolymer; and (B) 5 to 40% by weight of a polyamide resin, 1 to 15 parts by weight of (C) a polyether ester amide block copolymer; and 0.5 to 10 parts by weight of (D) a maleic anhydride-aromatic vinyl-vinyl cyanide copolymer.

[0029] Each component contained in the thermoplastic resin composition will be specifically described below.

[0030] (A1) Butadiene-based rubber modified aromatic vinyl-vinyl cyanide graft copolymer In one embodiment, the butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer imparts excellent impact resistance to a thermoplastic resin composition. In one embodiment, the butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer may have a core-shell structure in which a core made of a butadiene-based rubber polymer component is formed and a shell is formed by graft polymerization of an aromatic vinyl compound and a vinyl cyanide compound onto the core.

[0031] The butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer according to one embodiment can be prepared by adding an aromatic vinyl compound and a vinyl cyanide compound to a butadiene-based rubber polymer and graft polymerizing the mixture using a conventional polymerization method such as emulsion polymerization or bulk polymerization.

[0032] The butadiene-based rubber polymer is selected from the group consisting of butadiene rubber polymers, butadiene-styrene rubber polymers, butadiene-acrylonitrile rubber polymers, butadiene-acrylate rubber polymers, and mixtures thereof.

[0033] The aromatic vinyl compound is selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, pt-butylstyrene, 2,4-dimethylstyrene, chlorostyrene, vinyltoluene, vinylnaphthalene, and mixtures thereof.

[0034] The vinyl cyanide compound is selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, and mixtures thereof.

[0035] The butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer may have an average particle size of the butadiene-based rubber polymer of, for example, 0.2 to 1.0 μm, for example, 0.2 to 0.8 μm, for example, 0.25 to 0.40 μm. When the above range is satisfied, the thermoplastic resin composition can exhibit excellent impact resistance and appearance properties.

[0036] The butadiene rubber polymer is contained in an amount of 40 to 70% by weight relative to 100% by weight of the butadiene rubber-modified aromatic vinyl-vinyl cyanide graft copolymer, and the weight ratio of the aromatic vinyl compound to the vinyl cyanide compound graft-polymerized onto the core composed of the butadiene rubber polymer component may be 6:4 to 8:2.

[0037] In one embodiment, the butadiene-based rubber modified aromatic vinyl-vinyl cyanide graft copolymer may be an acrylonitrile-butadiene-styrene graft copolymer.

[0038] The butadiene rubber modified aromatic vinyl-vinyl cyanide graft copolymer is contained in an amount of 20 to 40% by weight, for example, 25 to 40% by weight, for example, 25 to 35% by weight, relative to 100% by weight of the base resin.

[0039] If the butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer is present in the base resin in an amount less than 20% by weight, it is difficult to achieve excellent impact resistance, whereas if it exceeds 40% by weight, heat resistance and fluidity may be reduced.

[0040] (A2) Aromatic vinyl-vinyl cyanide copolymer In one embodiment, the aromatic vinyl-vinyl cyanide copolymer can improve the fluidity of the thermoplastic resin composition and maintain the compatibility between the components at a certain level.

[0041] In one embodiment, the aromatic vinyl-vinyl cyanide copolymer may have a weight average molecular weight of 80,000 g / mol or more, for example, 85,000 g / mol or more, for example, 90,000 g / mol or more, and for example, 300,000 g / mol or less, for example, 200,000 g / mol or less, for example, 80,000 to 300,000 g / mol, for example, 80,000 to 200,000 g / mol.

[0042] In the present invention, the weight-average molecular weight is measured by dissolving a powder sample in tetrahydrofuran (THF) and then using Agilent Technologies' 1200 series gel permeation chromatography (GPC) (using polystyrene as a standard).

[0043] In one embodiment, the aromatic vinyl-vinyl cyanide copolymer can be produced by a conventional polymerization method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization of an aromatic vinyl compound and a vinyl cyanide compound.

[0044] The aromatic vinyl compound is selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, pt-butylstyrene, 2,4-dimethylstyrene, chlorostyrene, vinyltoluene, vinylnaphthalene, and mixtures thereof.

[0045] The vinyl cyanide compound is selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, and mixtures thereof.

[0046] The aromatic vinyl-vinyl cyanide copolymer may contain, based on 100% by weight, components derived from the aromatic vinyl compound in an amount of, for example, 55% by weight or more, for example, 60% by weight or more, for example, 65% by weight or more, and for example, 80% by weight or less, for example, 75% by weight or less, for example, 55 to 80% by weight, for example, 60 to 75% by weight.

[0047] Furthermore, the aromatic vinyl-vinyl cyanide copolymer may contain, based on 100% by weight, components derived from the vinyl cyanide compound in an amount of, for example, 20% by weight or more, for example, 25% by weight or more, or for example, 45% by weight or less, for example, 40% by weight or less, for example, 20 to 45% by weight, for example, 25 to 40% by weight.

[0048] In one embodiment, the vinyl aromatic-vinyl cyanide copolymer may be a styrene-acrylonitrile copolymer (SAN).

[0049] In one embodiment, the aromatic vinyl-vinyl cyanide copolymer is contained in an amount of 30 to 75% by weight, for example, 40 to 75% by weight, for example, 45 to 75% by weight, for example, 45 to 70% by weight, for example, 45 to 65% by weight, relative to 100% by weight of the base resin.

[0050] If the aromatic vinyl-cyanide vinyl copolymer is less than 30% by weight, the moldability of the thermoplastic resin composition may be reduced, and if it exceeds 75% by weight, the mechanical properties of molded articles using the thermoplastic resin composition may be reduced.

[0051] (B) Polyamide resin In one embodiment, the polyamide resin enables the thermoplastic resin composition to achieve excellent electrical conductivity without excessively adding the block copolymer.

[0052] In one embodiment, the polyamide resin may be any of various polyamide resins known in the art, such as an aromatic polyamide resin, an aliphatic polyamide resin, or a mixture thereof, and is not particularly limited.

[0053] The aromatic polyamide resin is a polyamide containing an aromatic group in the main chain, and may be a wholly aromatic polyamide, a semi-aromatic polyamide, or a mixture thereof.

[0054] The fully aromatic polyamide refers to a polymer of an aromatic diamine and an aromatic dicarboxylic acid, and the semi-aromatic polyamide refers to one containing at least one aromatic unit and one non-aromatic unit between amide bonds. For example, the semi-aromatic polyamide may be a polymer of an aromatic diamine and an aliphatic dicarboxylic acid, or a polymer of an aliphatic diamine and an aromatic dicarboxylic acid.

[0055] On the other hand, the aliphatic polyamide means a polymer of an aliphatic diamine and an aliphatic dicarboxylic acid.

[0056] Examples of the aromatic diamine include, but are not limited to, p-xylenediamine and m-xylenediamine, which may be used alone or in combination of two or more.

[0057] Examples of the aromatic dicarboxylic acid include, but are not limited to, phthalic acid, isophthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, (1,3-phenylenedioxy)diacetic acid, etc. These may be used alone or in combination.

[0058] Examples of the aliphatic diamine include, but are not limited to, ethylenediamine, trimethylenediamine, hexamethylenediamine, todecamethylenediamine, piperazine, etc. These may be used alone or in combination.

[0059] Examples of the aliphatic dicarboxylic acid include, but are not limited to, adipic acid, sebacic acid, succinic acid, glutaric acid, azelaic acid, dodecanedioic acid, dimer acid, cyclohexanedicarboxylic acid, etc. These may be used alone or in combination.

[0060] In one embodiment, the polyamide resin can include polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 4T, polyamide 410, polyamide 510, polyamide 1010, polyamide 1012, polyamide 10T, polyamide 1212, polyamide 12T, polyamide MXD6, or a combination thereof.

[0061] In one embodiment, the polyamide resin may include at least polyamide 6.

[0062] In one embodiment, the polyamide resin is contained in an amount of 5 to 40% by weight, for example, 5 to 35% by weight, for example, 5 to 30% by weight, for example, 5 to 25% by weight, for example, 5 to 20% by weight, relative to 100% by weight of the base resin.

[0063] When the content of the polyamide resin satisfies the above-mentioned range, the thermoplastic resin composition and the molded article produced therefrom can exhibit excellent rigidity, toughness, abrasion resistance, chemical resistance, oil resistance, etc., which are attributable to the polyamide resin.

[0064] On the other hand, if the polyamide resin is less than 5% by weight, the excellent physical properties attributable to the polyamide resin may not be exhibited, and if it exceeds 40% by weight, the mechanical strength and / or heat resistance of the thermoplastic resin composition and molded products using the same may be reduced.

[0065] (C) Polyetheresteramide block copolymer In one embodiment, the polyetheresteramide block copolymers can provide thermoplastic resin compositions and molded articles made therefrom with desired electrical conductivity.

[0066] In addition, the polyetheresteramide block copolymer allows the thermoplastic resin composition and molded articles produced therefrom to exhibit the aforementioned electrical conductivity while maintaining an excellent balance of physical properties.

[0067] In one embodiment, the polyetheresteramide block copolymer can be, for example, a reaction mixture of an aminocarboxylic acid, lactam, or diamine-dicarboxylate having 6 or more carbon atoms; a polyalkylene glycol; and a dicarboxylic acid having 4 to 20 carbon atoms.

[0068] In one embodiment, examples of the aminocarboxylic acid, lactam, or diamine-dicarboxylate having 6 or more carbon atoms include aminocarboxylic acids such as ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopelargonic acid, ω-aminocapric acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid; lactams such as ε-caprolactam, enantholactam, capryllactam, and laurolactam; and diamine-dicarboxylates such as hexamethylenediamine-adipic acid and hexamethylenediamine-isophthalic acid. For example, salts of 12-aminododecanoic acid, ε-caprolactam, and hexamethylenediamine-adipic acid can be used.

[0069] In one embodiment, examples of the polyalkylene glycol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol, block or random copolymers of ethylene glycol and propylene glycol, copolymers of ethylene glycol and tetrahydrofuran, etc. For example, polyethylene glycol, copolymers of ethylene glycol and propylene glycol, etc. can be used.

[0070] In one embodiment, examples of the dicarboxylic acid having 4 to 20 carbon atoms include terephthalic acid, 1,4-cyclohexanedicarboxylic acid, sebacic acid, adipic acid, and dodecanedioic acid.

[0071] In one embodiment, the bond between the aminocarboxylic acid, lactam or diamine-dicarboxylate having 6 or more carbon atoms and the polyalkylene glycol may be an ester bond, the bond between the aminocarboxylic acid, lactam or diamine-dicarboxylate having 6 or more carbon atoms and the dicarboxylic acid having 4 to 20 carbon atoms may be an amide bond, and the bond between the polyalkylene glycol and the dicarboxylic acid having 4 to 20 carbon atoms may be an ester bond.

[0072] In one embodiment, the polyetheresteramide block copolymer can be produced by a known synthesis method, for example, the synthesis method disclosed in Japanese Patent Publication No. 56-045419 and Japanese Patent Application Laid-Open No. 55-133424.

[0073] In one embodiment, the polyetheresteramide block copolymer may contain 10 to 95 wt % of polyetherester blocks, which may provide excellent electrical conductivity and heat resistance of the thermoplastic resin composition.

[0074] In one embodiment, the polyetheresteramide block copolymer is included in an amount of 1 to 15 parts by weight, for example, 2 to 10 parts by weight, based on 100 parts by weight of the base resin. When the content of the polyetheresteramide block copolymer satisfies the above range, the thermoplastic resin composition and molded articles produced therefrom can maintain an excellent balance of physical properties while also exhibiting excellent electrical conductivity.

[0075] (D) Maleic anhydride-aromatic vinyl-vinyl cyanide copolymer In one embodiment, the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer can maintain an appropriate balance of physical properties of the thermoplastic resin composition and molded articles produced therefrom. Specifically, the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer can maintain excellent physical properties (e.g., impact resistance, heat resistance, etc.) that may be reduced by adding the polyetheresteramide block copolymer.

[0076] In one embodiment, the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer can be produced by a conventional polymerization method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization of maleic anhydride, an aromatic vinyl compound, and a vinyl cyanide compound.

[0077] The aromatic vinyl compound may be selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, pt-butylstyrene, 2,4-dimethylstyrene, chlorostyrene, vinyltoluene, vinylnaphthalene, and mixtures thereof, and may be preferably styrene.

[0078] The vinyl cyanide compound may be selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, and mixtures thereof, and preferably acrylonitrile.

[0079] The copolymerization form of the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer is not particularly limited, and the component derived from maleic anhydride, the component derived from the aromatic vinyl compound, and the component derived from the vinyl cyanide compound may be in the form of an alternating copolymer, a random copolymer, or a block copolymer, or the component derived from maleic anhydride may be graft copolymerized onto a main chain in which the component derived from the aromatic vinyl compound and the component derived from the vinyl cyanide compound are copolymerized.

[0080] In one embodiment, the maleic anhydride-vinyl aromatic-vinyl cyanide copolymer may be a maleic anhydride-styrene-acrylonitrile copolymer.

[0081] The maleic anhydride-aromatic vinyl-vinyl cyanide copolymer may contain, based on 100% by weight, 0.5 to 30% by weight of a component derived from the maleic anhydride, 50 to 90% by weight of a component derived from the aromatic vinyl compound, and 5 to 40% by weight of a component derived from the vinyl cyanide compound. When these ranges are satisfied, the thermoplastic resin composition and molded articles produced therefrom may exhibit excellent impact resistance and / or heat resistance.

[0082] In one embodiment, the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer is contained in an amount of 0.5 to 10 parts by weight, for example, 0.5 to 9 parts by weight, for example, 0.5 to 8 parts by weight, for example, 1 to 8 parts by weight, for example, 1 to 7 parts by weight, for example, 1 to 6 parts by weight, or for example, 1 to 5 parts by weight, relative to 100 parts by weight of the base resin.

[0083] When the content of the maleic anhydride-aromatic vinyl-vinyl cyanide copolymer satisfies the above-mentioned range, the thermoplastic resin composition and molded articles produced therefrom can maintain an excellent balance of physical properties while simultaneously exhibiting excellent electrical conductivity.

[0084] (E) Other additives In addition to the components (A) to (D), the thermoplastic resin composition according to one embodiment may further include one or more additives required to balance the various physical properties under the condition of maintaining an excellent balance between electrical conductivity and other physical properties, or depending on the end use of the thermoplastic resin composition.

[0085] Specifically, the additives that can be used include nucleating agents, coupling agents, fillers, plasticizers, lubricants, mold release agents, antibacterial agents, heat stabilizers, antioxidants, ultraviolet stabilizers, flame retardants, colorants, and impact modifiers, and these can be used alone or in combination of two or more.

[0086] These additives are appropriately included within a range that does not impair the physical properties of the thermoplastic resin composition, and specifically, are included in an amount of 20 parts by weight or less per 100 parts by weight of the base resin, but are not limited to this amount.

[0087] The thermoplastic resin composition according to the present invention can be produced by a known method for producing a thermoplastic resin composition.

[0088] For example, the thermoplastic resin composition according to the present invention can be prepared in the form of pellets by simultaneously mixing the components of the present invention with other additives and then melt-kneading them in an extruder.

[0089] A molded article according to one embodiment of the present invention can be produced from the thermoplastic resin composition described above.

[0090] In one embodiment, the molded article may have a notched Izod impact strength of ¼” thick test specimen according to ASTM D256 of 20 to 60 kgf·cm / cm, for example, 20 to 50 kgf·cm / cm, for example, 20 to 40 kgf·cm / cm, for example, 20 to 35 kgf·cm / cm.

[0091] In one embodiment, the molded article has a surface resistance of 100 mm x 100 mm x 20 mm measured using a surface resistance measuring device (manufacturer: SIMCO-ION, device name: Worksurface Tester ST-4). 12 Ω / sq or less, e.g., 10 11.9 Ω / sq or less, e.g., 10 11.8 Ω / sq or less, e.g., 10 11.7 Ω / sq or less, e.g., 10 11.6 It may be Ω / sq or less.

[0092] In one embodiment, the molded article may have a heat distortion temperature (HDT) according to ASTM D648 of 80 to 100°C, for example, 80 to 95°C, for example, 80 to 90°C.

[0093] As described above, the thermoplastic resin composition has excellent impact resistance, electrical conductivity, and heat resistance, and is therefore widely applicable to various products that can be used with or without painting, and is particularly useful for moldings that require electrostatic painting.

[0094] The present invention will be described in more detail below through examples and comparative examples. However, the following examples and comparative examples are for illustrative purposes only and are not intended to limit the present invention.

[0095] Examples 1 to 4 and Comparative Examples 1 to 7 The thermoplastic resin compositions of Examples 1 to 4 and Comparative Examples 1 to 7 were produced using the component content ratios shown in Table 1 below.

[0096] In Table 1, (A1), (A2), and (B) are components contained in the base resin and are expressed in weight percent based on the total weight of the base resin, while (C) and (D) are components added to the base resin and are expressed in parts by weight relative to 100 parts by weight of the base resin.

[0097] The components listed in Table 1 were dry-mixed and continuously fed quantitatively into the feed section of a twin-screw extruder (L / D = 44, diameter = 45 mm) for melting and kneading. Next, the thermoplastic resin composition pelletized by the twin-screw extruder was dried at about 80°C for about 4 hours, and then test pieces for evaluating physical properties were produced using a 120-ton injection molding machine with a cylinder temperature of about 240°C and a mold temperature of about 60°C.

[0098] [Table 1]

[0099] The explanation for each component listed in Table 1 is as follows.

[0100] (A1) Butadiene-based rubber modified aromatic vinyl-vinyl cyanide graft copolymer Acrylonitrile-butadiene-styrene graft copolymer (Lotte Chemical Co.) with a core (average particle size: approximately 0.25 μm) made of butadiene rubber polymer (approximately 58% by weight) and a shell formed by graft polymerizing acrylonitrile and styrene (weight ratio of acrylonitrile:styrene = approximately 2.5: approximately 7.5) onto the core. (A2) Aromatic vinyl-vinyl cyanide copolymer Styrene-acrylonitrile copolymer with a weight-average molecular weight of approximately 110,000 g / mol, copolymerized from a monomer mixture containing approximately 28% by weight of acrylonitrile and approximately 72% by weight of styrene (Lotte Chemical Co.) (B) Polyamide resin Polyamide 6 resin (KP Chem Tech, EN-300) with a melting point of approximately 223°C and a relative viscosity of approximately 2.3 (C) Polyetheresteramide block copolymer Polyamide 6-polyethylene oxide block copolymer (PA6-b-PE0) (Sanyo, PELECTRON AS) (D) Maleic anhydride-aromatic vinyl-vinyl cyanide copolymer Maleic anhydride-styrene-acrylonitrile copolymer (Sunny FC, SAM-010) Experimental Example The results of the experiment are shown in Table 2 below.

[0101] (1) Surface resistance (unit: Ω / sq): The surface resistance of a 100 mm x 100 mm x 20 mm test piece was measured using a surface resistance measuring device (manufacturer: SIMCO-ION, device name: Worksurface Tester ST-4).

[0102] (2) Heat resistance (unit: °C): Heat distortion temperature (HDT) was measured according to ASTM D648.

[0103] (3) Impact resistance Type-I (unit: kgf·cm / cm): Notched Izod impact strength was measured for 1 / 4" thick test specimens according to ASTM D256.

[0104] (4) Impact Resistance Type-II (unit: N): The impact strength of the boss of a boss-shaped test piece (outer diameter of protrusion: 6 mm, inner diameter of protrusion: 3.5 mm, height of protrusion: 20 mm) was measured using the following experimental method. Specifically, an impact was applied to the side of the protrusion of the boss-shaped test piece with an impact hammer of approximately 420 g, and the impact energy with which the impact hammer struck the protrusion of the test piece was set to 1.8 J.

[0105] [Table 2]

[0106] From Tables 1 and 2, it can be seen that by using optimal amounts of butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer, aromatic vinyl-vinyl cyanide copolymer, polyamide resin, polyetheresteramide block copolymer, and maleic anhydride-aromatic vinyl-vinyl cyanide copolymer as in Examples 1 to 4, it is possible to provide thermoplastic resin compositions and molded articles using the same that exhibit superior electrical conductivity, impact resistance, and heat resistance compared to the comparative examples.

[0107] Although the present invention has been described above through preferred embodiments, it will be readily understood by those skilled in the art that the present invention is not limited thereto, and that various modifications and variations are possible without departing from the concept and scope of the claims set forth below.

Claims

1. A thermoplastic resin composition, The thermoplastic resin composition is (A1) 20 to 40% by weight of a butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer; (A2) 30 to 75% by weight of an aromatic vinyl-vinyl cyanide copolymer; and (B) 5 to 40% by weight of a polyamide resin; For 100 parts by weight of a base resin containing (C) 1 to 15 parts by weight of a polyether ester amide block copolymer; and (D) 0.5 to 10 parts by weight of maleic anhydride-aromatic vinyl-vinyl cyanide copolymer Including, The (A1) butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer is obtained by graft polymerizing an aromatic vinyl compound and a vinyl cyanide compound onto a butadiene-based rubber polymer, A molded article produced from the thermoplastic resin composition has a notched Izod impact strength of 20 to 60 kgf cm / cm for a 1 / 4" (=0.635 cm) thick test piece according to ASTM D256, The molded article produced from the thermoplastic resin composition was measured using a surface resistance measuring device (manufacturer: SIMCO-ION, device name: Worksurface Tester ST-4) on a 100 mm x 100 mm x 20 mm test piece, and the surface resistance was measured to be 10 １２．０ Ω / sq or less, A molded article produced from the thermoplastic resin composition has a heat distortion temperature (HDT) according to ASTM D648 of 80 to 100°C. Thermoplastic resin composition.

2. The (A1) butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer is a core made of a butadiene-based rubber polymer; 2. The thermoplastic resin composition according to claim 1, which has a core-shell structure comprising a shell formed by graft polymerizing an aromatic vinyl compound and a vinyl cyanide compound onto the core.

3. 3. The thermoplastic resin composition according to claim 1, wherein the butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer (A1) has an average particle size of the rubber polymer of 0.2 to 1.0 μm.

4. The thermoplastic resin composition according to any one of claims 1 to 3, wherein the butadiene-based rubber-modified aromatic vinyl-vinyl cyanide graft copolymer (A1) is an acrylonitrile-butadiene-styrene copolymer obtained by graft polymerizing styrene and acrylonitrile onto a butadiene rubber polymer.

5. The thermoplastic resin composition according to any one of claims 1 to 4, wherein the aromatic vinyl-vinyl cyanide copolymer (A2) comprises, based on 100% by weight, 55 to 80% by weight of a component derived from an aromatic vinyl compound and 20 to 45% by weight of a component derived from a vinyl cyanide compound.

6. The thermoplastic resin composition according to any one of claims 1 to 5, wherein the aromatic vinyl-cyanide vinyl copolymer (A2) has a weight average molecular weight of 80,000 to 300,000 g / mol.

7. The thermoplastic resin composition according to any one of claims 1 to 6, wherein the aromatic vinyl-vinyl cyanide copolymer (A2) is a styrene-acrylonitrile copolymer.

8. The thermoplastic resin composition according to any one of claims 1 to 7, wherein the (B) polyamide resin comprises polyamide 6, polyamide 66, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 4T, polyamide 410, polyamide 510, polyamide 1010, polyamide 1012, polyamide 10T, polyamide 1212, polyamide 12T, polyamide MXD6, or a combination thereof.

9. The thermoplastic resin composition according to any one of claims 1 to 8, wherein the polyetheresteramide block copolymer is a reaction mixture of an aminocarboxylic acid, lactam, or diamine-dicarboxylate having 6 or more carbon atoms; a polyalkylene glycol; and a dicarboxylic acid having 4 to 20 carbon atoms.

10. The thermoplastic resin composition according to any one of claims 1 to 9, wherein the (D) maleic anhydride-aromatic vinyl-cyanide vinyl copolymer is a maleic anhydride-styrene-acrylonitrile copolymer.

11. The thermoplastic resin composition according to any one of claims 1 to 10, further comprising at least one additive selected from the group consisting of a nucleating agent, a coupling agent, a filler, a plasticizer, a lubricant, a mold release agent, an antibacterial agent, a heat stabilizer, an antioxidant, an ultraviolet stabilizer, a flame retardant, a colorant, and an impact modifier.

12. A molded article produced from the thermoplastic resin composition according to any one of claims 1 to 11.

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