WO2019164167A1 - Thermoplastic resin composition and molded article formed therefrom - Google Patents

Abstract

A thermoplastic resin composition of the present invention is characterized by comprising: about 100 parts by weight of a rubber-modified aromatic vinyl-based copolymer resin including about 20 to about 50 wt% of a rubber-modified vinyl-based graft copolymer and about 50 to about 80 wt% of an aromatic vinyl-based copolymer resin; about 1 to about 5 parts by weight of a modified polyolefin including a repeating unit represented by chemical formula 1 and a repeating unit represented by chemical formula 2; and about 5 to about 20 parts by weight of a hollow inorganic filler. The thermoplastic resin composition is excellent in impact resistance, flowability, lightweightness, and the like.

Description

Thermoplastic resin composition and molded article formed therefrom

The present invention relates to a thermoplastic resin composition and a molded article formed therefrom. More specifically, the present invention relates to a thermoplastic resin composition excellent in impact resistance, flowability, light weight, and the like, and a molded article formed therefrom.

As the thermoplastic resin, rubber-modified aromatic vinyl copolymer resins such as acrylonitrile-butadiene-styrene copolymer resin (ABS resin) are excellent in mechanical properties, processability, appearance characteristics, etc. It is widely used as interior / exterior materials for automobiles and exterior materials for construction. In particular, with the recent trend of lightening electrical / electronic products, plastic products using thermoplastic resins are rapidly replacing the areas of glass and metal.

In order to further reduce the weight of the thermoplastic resin composition, a filler of low specific gravity may be applied, or a low specific gravity material such as polypropylene may be applied. In this case, impact resistance, mechanical properties, processability (fluidity), compatibility, etc. There is a problem that property degradation occurs or the weight reduction is not sufficient.

Therefore, there is a need for development of a thermoplastic resin composition having excellent impact resistance, flowability, light weight, balance of physical properties, and the like.

Background art of the present invention is disclosed in the Republic of Korea Patent Publication No. 10-2016-0083518.

An object of the present invention is to provide a thermoplastic resin composition excellent in impact resistance, flowability, light weight and the like.

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

The above and other objects of the present invention can be achieved by the present invention described below.

1. One aspect of the present invention relates to a thermoplastic resin composition. The thermoplastic resin composition may include about 100 parts by weight of a rubber modified aromatic vinyl copolymer resin including about 20 wt% to about 50 wt% of the rubber modified vinyl graft copolymer and about 50 wt% to about 80 wt% of the aromatic vinyl copolymer copolymer resin; About 1 to about 5 parts by weight of a modified polyolefin comprising a repeating unit represented by Formula 1 and a repeating unit represented by Formula 2 below; And about 5 to about 20 parts by weight of the hollow inorganic filler;

[Formula 1]

[Formula 2]

In Formula 2, R ₁ is a hydrogen atom or a methyl group, Y is -COOR ₂ (R ₂ is an alkyl group having 1 to 12 carbon atoms), a glycidyl modified ester group, an arylate group, or a nitrile group (-CN) .

2. In one embodiment, the rubber-modified vinyl graft copolymer may be a graft polymerized monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer in a rubbery polymer.

3. In the above 1 or 2 embodiment, the aromatic vinyl copolymer resin may be a polymer of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.

4. In the embodiments 1 to 3, the modified olefin may include about 50 to about 95 weight% of the repeating unit represented by Formula 1 and about 5 to about 50 weight% of the repeating unit represented by Formula 2 .

5. In the embodiments 1 to 4, the hollow inorganic filler may be spherical hollow glass particles.

6. In the above 1 to 5 embodiments, the weight ratio of the modified polyolefin and the hollow inorganic filler may be about 0.1: 1 to about 0.5: 1.

7. In the above 1 to 6 embodiments, the thermoplastic resin composition may have a notched Izod impact strength of 1/8 "thick specimen measured in accordance with ASTM D256 of about 12 kgf · cm / cm or more.

8. In the above 1 to 7 embodiments, the thermoplastic resin composition may be about 1.5 to about 3.5 g / 10 minutes melt flow index measured at 200 ℃, 5 kgf conditions in accordance with ASTM D1238.

9. In the above embodiments 1 to 8, the thermoplastic resin composition may have a specific gravity of about 1 or less, based on ASTM D792.

10. Another aspect of the present invention relates to a molded article. The molded article is formed from the thermoplastic resin composition according to any one of the above 1 to 9.

The present invention has the effect of the invention of providing a thermoplastic resin composition excellent in impact resistance, flowability, light weight and the like and a molded article formed therefrom.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin composition according to the present invention is (A) rubber-modified aromatic vinyl copolymer resin; (B) modified polyolefins; And (C) a hollow inorganic filler.

In the present specification, "a to b" indicating a numerical range is defined as "≥a and <b".

(A) Rubber Modified Aromatic Vinyl Copolymer Resin

The rubber modified aromatic vinyl copolymer resin of the present invention may include (A1) rubber modified vinyl graft copolymer and (A2) aromatic vinyl copolymer resin.

(A1) rubber-modified vinyl-based graft copolymer

Rubber-modified vinyl graft copolymer according to an embodiment of the present invention may be a graft polymerized monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer in the rubber polymer. For example, the rubber-modified vinyl graft copolymer may be obtained by graft polymerization of a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer in a rubbery polymer, and, if necessary, processability and The monomer which gives heat resistance can be further included and graft-polymerized. The polymerization may be carried out by known polymerization methods such as emulsion polymerization and suspension polymerization. In addition, the rubber-modified vinyl graft copolymer may form a core (rubber polymer) -shell (copolymer of monomer mixture) structure, but is not limited thereto.

In an embodiment, the rubbery polymer may be a diene rubber such as polybutadiene, poly (styrene-butadiene), poly (acrylonitrile-butadiene), or a saturated rubber hydrogenated to the diene rubber, isoprene rubber, C 2 to C 10 alkyl (meth) acrylate rubbers, copolymers of alkyl (meth) acrylates having 2 to 10 carbon atoms and styrene, ethylene-propylene-diene monomer terpolymers (EPDM), and the like. These can be applied individually or in mixture of 2 or more types. For example, a diene rubber, (meth) acrylate rubber, etc. can be used, Specifically, butadiene rubber, butyl acrylate rubber, etc. can be used.

In embodiments, the rubbery polymer (rubber particles) has an average particle size (D50) measured by particle size analyzer of about 0.05 to about 6 μm, for example about 0.15 to about 4 μm, specifically about 0.25 to about 3.5 μm Can be. In the above range, the thermoplastic resin composition may be excellent in impact resistance, appearance characteristics, and the like. Here, the average particle size (z-average) of the rubbery polymer (rubber particles) may be measured using a light scattering method in a latex state. Specifically, the rubber polymer latex is filtered through a mesh to remove coagulum generated during the polymerization of the rubber polymer, and 0.5 g of latex and 30 ml of distilled water are poured into a 1,000 ml flask and filled with distilled water to prepare a sample. 10 ml of the sample is transferred to a quartz cell, and the average particle size of the rubbery polymer can be measured by a light scattering particle size analyzer (nano-zs, Malvern).

In embodiments, the content of the rubbery polymer may be about 20 to about 70% by weight, for example about 25 to about 60% by weight of the total 100% by weight of the rubber-modified vinyl-based graft copolymer, the monomer mixture (aromatic The vinyl monomer and the vinyl cyanide monomer) may be about 30 to about 80 wt%, for example about 40 to about 75 wt%, of 100 wt% of the total rubber-modified vinyl graft copolymer. In the above range, the thermoplastic resin composition may be excellent in impact resistance, appearance characteristics, and the like.

In an embodiment, the aromatic vinyl monomer may be graft copolymerized to the rubbery polymer, styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethyl styrene, vinyl xylene, Monochlorostyrene, dichlorostyrene, dibromostyrene, vinylnaphthalene, etc. can be illustrated. These may be used alone or in combination of two or more thereof. The aromatic vinyl monomer may be included in an amount of about 10 wt% to about 90 wt%, for example, about 40 wt% to about 90 wt% in 100 wt% of the monomer mixture. In the above range, the processability, impact resistance, and the like of the thermoplastic resin composition may be excellent.

In one embodiment, the vinyl cyanide monomer is copolymerizable with the aromatic vinyl system, and may include acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, fumaronitrile, and the like. It can be illustrated. These may be used alone or in combination of two or more thereof. For example, acrylonitrile, methacrylonitrile, etc. can be used. The content of the vinyl cyanide monomer may be about 10 wt% to about 90 wt%, for example about 10 wt% to about 60 wt%, in 100 wt% of the monomer mixture. In the above range, the thermoplastic resin composition may have excellent chemical resistance, mechanical properties, and the like.

In a specific example, monomers for imparting processability and heat resistance may include, but are not limited to, (meth) acrylic acid, maleic anhydride, N-substituted maleimide, and the like. When using the monomer for imparting the processability and heat resistance, the content may be 15% by weight or less, for example 0.1 to 10% by weight of 100% by weight of the monomer mixture. In the above range, processability and heat resistance can be imparted to the thermoplastic resin composition without deteriorating other physical properties.

In one embodiment, the rubber-modified vinyl graft copolymer is a copolymer in which a styrene monomer, which is an aromatic vinyl compound, and an acrylonitrile monomer, which is a vinyl cyanide compound, are grafted to a butadiene rubber polymer, and butyl acryl. An acrylate-styrene-acrylonitrile graft copolymer (g-ASA) which is a copolymer in which the styrene monomer which is an aromatic vinyl type compound, and the acrylonitrile monomer which is a vinyl cyanide compound is grafted to a latex rubbery polymer can be illustrated. have.

In embodiments, the rubber-modified vinyl graft copolymer is about 20 to about 50 weight in 100% by weight of the total rubber-modified aromatic vinyl copolymer resin (rubber modified vinyl graft copolymer and aromatic vinyl copolymer resin) %, For example from about 25 to about 45% by weight. When the rubber-modified vinyl graft copolymer is less than about 20% by weight in 100% by weight of the total rubber-modified aromatic vinyl-based copolymer resin, impact resistance, light weight, etc. of the thermoplastic resin composition may be lowered, and about 50% by weight. When exceeding%, there exists a possibility that fluidity | liquidity, an external appearance characteristic, etc. may fall.

(A2) aromatic vinyl copolymer resin

The aromatic vinyl copolymer resin according to one embodiment of the present invention may be an aromatic vinyl copolymer resin used in a conventional rubber-modified vinyl copolymer resin. For example, the aromatic vinyl copolymer resin may be a polymer of a monomer mixture including an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.

In an embodiment, the aromatic vinyl copolymer resin may be obtained by mixing an aromatic vinyl monomer and a monomer copolymerizable with an aromatic vinyl monomer, and then polymerizing them, and the polymerization may be emulsion polymerization, suspension polymerization, bulk polymerization, or the like. It can be carried out by a known polymerization method of.

In embodiments, the aromatic vinyl monomers include styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethyl styrene, vinyl xylene, monochlorostyrene, dichlorostyrene, dibromostyrene , Vinylnaphthalene and the like can be used. These can be applied individually or in mixture of 2 or more types. The content of the aromatic vinyl monomer may be about 20 to about 90 wt%, for example about 30 to about 80 wt%, of 100 wt% of the total aromatic vinyl copolymer resin. In the above range, the impact resistance, fluidity, and the like of the thermoplastic resin composition may be excellent.

In a specific embodiment, as the monomer copolymerizable with the aromatic vinyl monomer, for example, acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, fumaronitrile, and the like. Vinyl cyanide monomers; (Meth) acrylic acid, maleic anhydride, N-substituted maleimide, etc. can be used, and can be used individually or in mixture of 2 or more types. The content of the monomer copolymerizable with the aromatic vinyl monomer may be about 10 wt% to about 80 wt%, for example, about 20 wt% to about 70 wt% of the total 100 wt% of the aromatic vinyl copolymer copolymer resin. In the above range, the impact resistance, fluidity, and the like of the thermoplastic resin composition may be excellent.

In embodiments, the aromatic vinyl copolymer resin has a weight average molecular weight (Mw) of about 50,000 to about 300,000 g / mol, for example, about 90,000 to about 150,000 g / mol, measured by gel permeation chromatography (GPC). Can be. In the above range, the mechanical strength, moldability, and the like of the thermoplastic resin composition may be excellent.

In embodiments, the aromatic vinyl copolymer resin may be included in about 50 to about 80% by weight, for example about 55 to about 75% by weight of 100% by weight of the total rubber-modified aromatic vinyl copolymer resin. When the aromatic vinyl copolymer resin is less than about 50% by weight in 100% by weight of the total rubber-modified aromatic vinyl copolymer resin, there is a fear that the fluidity, appearance characteristics, etc. of the thermoplastic resin composition may be lowered, and exceed about 80% by weight. If it does, there exists a possibility that impact resistance, light weight, etc. may fall.

(B) modified polyolefin

The modified polyolefin of the present invention can be applied together with the hollow inorganic filler to improve impact resistance, light weight, flowability, and the like of the thermoplastic resin composition. Cylyl modified ester group, arylate group, nitrile group, etc.). For example, a modified polyolefin including a repeating unit represented by the following Chemical Formula 1 and a repeating unit represented by the following Chemical Formula 2 may be used.

[Formula 1]

[Formula 2]

In Formula 2, R ₁ is a hydrogen atom or a methyl group, Y is -COOR ₂ (R ₂ is an alkyl group having 1 to 12 carbon atoms), a glycidyl modified ester group, an arylate group, or a nitrile group (-CN) .

In embodiments, the modified polyolefin may be prepared by polymerizing olefin and at least one compound of alkyl (meth) acrylate, ethylenically unsaturated group-containing modified ester, ethylenically unsaturated group-containing arylate and acrylonitrile. For example, the modified polyolefin manufactured by superposing | polymerizing an olefin and alkyl (meth) acrylate can be applied.

In embodiments, the modified olefin is about 50 to about 95% by weight of the repeating unit represented by Formula 1, for example about 70 to about 93% by weight and about 5 to about 50% by weight of the repeating unit represented by Formula 2 For example, about 7 to about 30% by weight. Impact resistance, fluidity (molding processability), compatibility of the thermoplastic resin composition in the above range may be excellent.

In an embodiment, the modified polyolefin may be in the form of a copolymer of random, block, multiblock, or a combination thereof.

In embodiments, the modified polyolefin has a melt flow index of about 0.01 to about 40 g / 10 minutes, for example about 0.1 to about 10 g / 10 minutes, measured at 190 ° C., 2.16 kgf, according to ASTM D1238. Can be.

In embodiments, the modified polyolefin may be included in an amount of about 1 to about 5 parts by weight, for example about 2 to about 4 parts by weight, based on about 100 parts by weight of the rubber-modified aromatic vinyl copolymer resin. When the content of the modified polyolefin is less than about 1 part by weight, the impact resistance and the like of the thermoplastic resin composition may be lowered. When the content of the modified polyolefin is greater than about 5 parts by weight, the lightweight, mechanical properties, etc. of the thermoplastic resin composition may be lowered. have.

(C) hollow inorganic filler

The hollow inorganic filler according to one embodiment of the present invention is a hollow inorganic filler that is commonly used, and may be applied together with a modified polyolefin to improve impact resistance, light weight, flowability, and the like of the thermoplastic resin composition.

In embodiments, the hollow inorganic filler may be spherical hollow glass particles (glass bubble). The glass constituting the hollow glass particles includes soda-lime borosilicate glass containing silicon dioxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), sodium oxide (Na ₂ O), calcium oxide (CaO), and the like. borosilicate glass) may be used, and one or two or more glasses may be used.

In embodiments, the hollow inorganic filler may have a specific gravity of about 0.46 to about 0.6, a breaking strength of about 15,500 to about 30,000 psi, and a particle diameter of about 10 to about 60 μm. In addition, the hollow inorganic filler may be a surface treated with a coupling agent or the like, but is not limited thereto.

In an embodiment, the hollow inorganic filler may be included in an amount of about 5 to about 20 parts by weight, for example about 8 to about 15 parts by weight, based on about 100 parts by weight of the rubber-modified aromatic vinyl copolymer resin. When the content of the hollow inorganic filler is less than about 5 parts by weight, there is a fear that the light weight and the like of the thermoplastic resin composition may be lowered. When the content of the hollow inorganic filler is greater than about 20 parts by weight, impact resistance, fluidity, and the like may be lowered.

In an embodiment, the weight ratio (B) :( C) of the modified polyolefin (B) and the hollow inorganic filler (C) is about 0.1: 1 to about 0.5: 1, for example about 0.2: 1 to about 0.4 May be one. In the above range, the impact resistance, light weight, flowability, balance of physical properties of the thermoplastic resin composition, etc. may be more excellent.

The thermoplastic resin composition according to one embodiment of the present invention may further include an additive included in a conventional thermoplastic resin composition. Examples of the additives include, but are not limited to, flame retardants, antioxidants, anti drip agents, lubricants, mold release agents, nucleating agents, stabilizers, pigments, dyes, mixtures thereof, and the like. When using the additive, the content may be about 0.001 to about 40 parts by weight, for example about 0.1 to about 10 parts by weight, based on about 100 parts by weight of the thermoplastic resin.

The thermoplastic resin composition according to an embodiment of the present invention may be in the form of pellets mixed with the components and melt-extruded at about 200 to about 280 ° C, for example, about 220 to about 250 ° C, using a conventional twin screw extruder. Can be.

In embodiments, the thermoplastic resin composition has a notched Izod impact strength of at least about 12 kgf · cm / cm, for example about 13 to about 25 kgf · cm / cm, of a 1/8 ”thick specimen measured according to ASTM D256. Can be.

In an embodiment, the thermoplastic resin composition has a melt flow index of about 1.5 to about 3.5 g / 10 minutes, for example about 1.8 to about 3.0 g / 10 minutes, measured at 200 ° C. and 5 kgf, based on ASTM D1238. Can be.

In an embodiment, the thermoplastic resin composition may have a specific gravity of about 1 or less, for example, about 0.92 to about 0.99, based on ASTM D792.

The molded article according to the present invention is formed from the thermoplastic resin composition. The thermoplastic resin composition may be prepared in a pellet form, and the prepared pellet may be manufactured into various molded products (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known by those skilled in the art. Since the molded article is excellent in impact resistance, fluidity, light weight, balance of physical properties, and the like, it is useful as an interior / exterior material of a lightweight electric / electronic product that can be mounted by a consumer.

Hereinafter, the present invention will be described in more detail with reference to examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example

Hereinafter, the specification of each component used in the Example and the comparative example is as follows.

(A) Rubber Modified Aromatic Vinyl Copolymer Resin

The following (A1) rubber modified vinyl graft copolymer and (A2) aromatic vinyl copolymer resin were mixed and used.

(A1) rubber-modified vinyl-based graft copolymer

58-wt% butadiene rubber (average particle size: 310 nm) was used g-ABS graft copolymerized with 42 wt% styrene and acrylonitrile (weight ratio 75/25).

(A2) aromatic vinyl copolymer resin

SAN resin (weight average molecular weight: 100,000 g / mol) polymerized with 71.5% by weight of styrene and 28.5% by weight of acrylonitrile was used.

(B) modified polyolefin

(B1) Ethylene / methylacrylate copolymer (manufacturer: Dupont, product name: Elvaloy AC1330) was used.

(B2) maleic anhydride-modified polyolefin (MAH-grafted Ethylene-1-butene copolymer, manufactured by Mitsui chemical, product name: Tafmer MH7020) was used.

(C) weapon filler

As the hollow inorganic filler (C1), glass bubbles (manufacturer: 3M, product name: IM16K) were used.

(C2) Glass fiber (manufacturer: NEG, product name: T351 / R) was used.

(D) impact modifier

(D1) Silicone-containing copolymer A copolymer having a core-shell structure (manufacturer: Kaneka, product name: M-210) was used.

(D2) Acrylate copolymer A copolymer having a core-shell structure (manufacturer: MRC, product name: Metablen S-RK-200) was used.

Example  1 to 4 and Comparative example  1 to 8

Each of the components was added in an amount as described in Tables 1 and 2, followed by extrusion at 230 ° C. to prepare pellets. Extrusion was performed using a twin screw extruder having a diameter of L / D = 36 and 45 mm, and the prepared pellets were dried at 80 ° C. for at least 2 hours, and then injected into a specimen at a 6 Oz injection machine (molding temperature 230 ° C., mold temperature: 60 ° C.). Was prepared. The physical properties of the prepared specimens were evaluated by the following method, and the results are shown in Tables 1 and 2 below.

Property measurement method

(1) Impact Resistance Evaluation: According to ASTM D256, the notched Izod impact strength (unit: kgf · cm / cm) of the 1/8 ”thick specimen was measured.

(2) Flowability evaluation: According to ASTM D1238, the melt flow index (MI, unit: g / 10 min) was measured at 200 ° C and 5 kgf conditions.

(3) Specific gravity: Specific gravity was measured according to ASTM D792.

		Example
		One	2	3	4
(A) (% by weight)	(A1)	40	40	40	40
	(A2)	60	60	60	60
(B1) (parts by weight)		2	4	3	3
(B2) (parts by weight)		-	-	-	-
(C1) (parts by weight)		10	10	8	15
(C2) (parts by weight)		-	-	-	-
(D1) (parts by weight)		-	-	-	-
(D2) (parts by weight)		-	-	-	-
Notch Izod Impact Strength		14.6	18.7	21.1	13.1
Flow Flow Index		1.8	2.0	2.8	1.8
importance		0.95	0.94	0.97	0.92

* Parts by weight: parts by weight based on 100 parts by weight of the base resin (A)

		Comparative example
		One	2	3	4	5	6	7	8
(A) (% by weight)	(A1)	15	60	40	40	40	40	40	40
	(A2)	85	40	60	60	60	60	60	60
(B1) (parts by weight)		3	3	3	3	-	-	-	3
(B2) (parts by weight)		-	-	-	-	-	-	3	-
(C1) (parts by weight)		10	10	4	21	10	10	10	-
(C2) (parts by weight)		-	-	-	-	-	-	-	10
(D1) (parts by weight)		-	-	-	-	3		-	-
(D2) (parts by weight)		-	-	-	-		3	-	-
Notch Izod Impact Strength		8.2	26.1	24.7	10.8	11.8	11.4	11.3	6.5
Flow Flow Index		3.2	0.8	3.3	0.7	2.0	1.9	2.3	1.2
importance		0.98	0.92	1.00	0.90	0.94	0.94	0.95	1.13

* Parts by weight: parts by weight based on 100 parts by weight of the base resin (A)

From the above results, it can be seen that the thermoplastic resin composition of the present invention is all excellent in impact resistance, fluidity, light weight, and the like.

On the other hand, in Comparative Example 1 in which a small amount of rubber-modified vinyl graft copolymer is applied, impact resistance, light weight, etc. are deteriorated, and in Comparative Example 2 in which an excessive amount of rubber-modified vinyl graft copolymer is applied, fluidity is increased. It can be seen that the deterioration and the like, in the case of Comparative Example 3 to which a small amount of the hollow inorganic filler is applied, the lightness and the like is deteriorated. It can be seen that, in the case of Comparative Examples 5 and 6 to which the impact modifiers (D1) and (D2) were applied instead of the modified polyolefin of the present invention, it can be seen that the impact resistance is lowered. In addition, in the case of Comparative Example 7 in which maleic anhydride-modified polyolefin was applied instead of the modified polyolefin of the present invention, impact resistance was lowered. In the case of Comparative Example 8 in which glass fiber was applied instead of hollow inorganic filler, It can be seen that impact, fluidity and the like are deteriorated.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (10)

1. About 100 parts by weight of a rubber modified aromatic vinyl copolymer resin comprising about 20 to about 50 wt% of the rubber modified vinyl graft copolymer and about 50 to about 80 wt% of the aromatic vinyl copolymer resin;

   About 1 to about 5 parts by weight of a modified polyolefin comprising a repeating unit represented by Formula 1 and a repeating unit represented by Formula 2 below; And

   About 5 to about 20 parts by weight of the hollow inorganic filler; thermoplastic resin composition comprising:

   [Formula 1]

   

   [Formula 2]

   

   In Formula 2, R ₁ is a hydrogen atom or a methyl group, Y is -COOR ₂ (R ₂ is an alkyl group having 1 to 12 carbon atoms), a glycidyl modified ester group, an arylate group, or a nitrile group (-CN) .
2. The thermoplastic resin composition of claim 1, wherein the rubber-modified vinyl graft copolymer is a graft polymerized monomer mixture including an aromatic vinyl monomer and a vinyl cyanide monomer in a rubbery polymer.
3. The thermoplastic resin composition according to claim 1 or 2, wherein the aromatic vinyl copolymer resin is a polymer of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.
4. The method according to any one of claims 1 to 3, wherein the modified olefin is about 50 to about 95% by weight of the repeating unit represented by Formula 1 and about 5 to about 50% by weight of the repeating unit represented by Formula 2 Thermoplastic resin composition comprising a.
5. The thermoplastic resin composition according to any one of claims 1 to 4, wherein the hollow inorganic filler is a spherical hollow glass particle.
6. 6. The thermoplastic resin composition of claim 1, wherein the weight ratio of the modified polyolefin and the hollow inorganic filler is about 0.1: 1 to about 0.5: 1. 7.
7. 7. The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition has a notched Izod impact strength of at least about 12 kgf · cm / cm, measured in accordance with ASTM D256. Thermoplastic resin composition.
8. 8. The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition has a melt flow index of about 1.5 to about 3.5 g / 10 minutes, measured at 200 ° C. and 5 kgf, based on ASTM D1238. 9. Thermoplastic resin composition.
9. The thermoplastic resin composition according to any one of claims 1 to 8, wherein the thermoplastic resin composition has a specific gravity measured based on ASTM D792 of about 1 or less.
10. A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 9.