WO2021221292A1 - Thermoplastic resin composition and molded article formed therefrom - Google Patents

Abstract

A thermoplastic resin composition according to the present invention is a thermoplastic resin composition comprising: about 100 parts by weight of a rubber-modified aromatic vinyl-based copolymer resin comprising about 18 to 28 weight% of a rubber-modified vinyl-based graft copolymer and about 72 to 82 weight% of an aromatic vinyl-cyanide vinyl-based copolymer resin; about 0.1 to 1 part by weight of zeolite; and about 0.05 to 0.6 parts by weight of an alkyl phosphate of 10 to 20 carbon atoms, wherein the thermoplastic resin composition is characterized in that a residual amount of the vinyl cyanide compound in 2 g of a thermoplastic resin composition specimen in a pellet form is about 10 ppm or less as measured at 250℃ by a headspace gas chromatograph mass spectrometer. The thermoplastic resin composition is excellent in impact resistance, rigidity, etc., and can reduce the residual amount of the vinyl cyanide compound.

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 having excellent impact resistance, rigidity, etc. and reducing the residual amount of a vinyl cyanide-based compound, and a molded article formed therefrom.

Rubber-modified aromatic vinyl-based copolymer resins such as acrylonitrile-butadiene-styrene copolymer (ABS) resins generally include rubber-modified vinyl-based graft copolymers and aromatic vinyl-cyanide-based copolymer resins, It has excellent mechanical properties such as impact property and rigidity, and excellent adhesion to urethane for fixing the filter, so it can be applied to a water purifier filter housing, etc.

However, in order for the rubber-modified aromatic vinyl-based copolymer resin to be applied as a water purifier filter housing, it is necessary to lower the content of residual vinyl cyanide compounds in accordance with the NSF42 standard as it is intended for direct contact with drinking water.

For this purpose, a method of lowering the content of the vinyl cyanide compound (monomer) in the aromatic vinyl-vinyl cyanide copolymer resin was considered, but this method reduces the content of the vinyl cyanide compound in the resin, and the rubber-modified aromatic vinyl copolymer There is a problem in that the mechanical properties of the resin and the like decrease.

As another method, there is a method of reducing the residual amount of the vinyl cyanide compound by improving the conversion rate during polymerization of the aromatic vinyl-vinyl cyanide copolymer resin, but there is a problem in that it is difficult to apply in practice due to reduced productivity.

Therefore, there is a need to develop a thermoplastic resin composition having excellent impact resistance, rigidity, and the like, and capable of reducing the residual amount of the vinyl cyanide-based compound.

Background art of the present invention is disclosed in Korean Patent Publication No. 2002-0048628 and the like.

An object of the present invention is to provide a thermoplastic resin composition which is excellent in impact resistance, rigidity, etc., and can reduce the residual amount of a vinyl cyanide-based compound.

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

All of 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 is about 18 to about 28% by weight of a rubber-modified vinyl-based graft copolymer, and about 72 to about 82% by weight of an aromatic vinyl-vinyl-cyanide-based copolymer resin. 100 parts by weight; about 0.1 to about 1 part by weight of zeolite; and about 0.05 to about 0.6 parts by weight of an alkyl phosphate having 10 to 20 carbon atoms, wherein the aromatic vinyl-vinyl cyanide copolymer resin comprises about 65 to about 70 weight % of an aromatic vinyl monomer and a vinyl cyanide-based monomer. It is a polymer of a monomer mixture containing about 30 to about 35 wt% of a monomer, and the thermoplastic resin composition is a thermoplastic resin composition in the form of pellets measured at 250° C. using a headspace gas chromatograph mass spectrometer (Headspace GC/MS). It is characterized in that the residual amount of the vinyl cyanide-based compound present in 2 g of the specimen is about 10 ppm or less.

2. In the first embodiment, the rubber-modified vinyl-based graft copolymer is a rubber-modified vinyl-based graft copolymer obtained by graft polymerization of a monomer mixture comprising an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to a rubbery polymer. can

3. In the first or second embodiment, the aromatic vinyl-vinyl cyanide copolymer resin may have a weight average molecular weight of about 100,000 to about 150,000 g/mol as measured by gel permeation chromatography (GPC).

4. In embodiments 1 to 3, the zeolite may be porous particles having a pore size of about 0.1 to about 0.6 nm and an average particle size of about 0.5 to about 6 μm.

5. In the above 1 to 4 embodiments, the weight ratio of the zeolite and the alkyl phosphate may be about 1:1 to about 5:1.

6. In the above 1 to 5 embodiments, the thermoplastic resin composition may have a notch Izod impact strength of about 16 to about 26 kgf·cm/cm of a 1/4″ thick specimen measured according to ASTM D256, and the thermoplastic resin composition ^{The resin composition may have a flexural strength of about 22,000 to about 26,000 kgf/cm 2} measured at a rate of 2.8 mm/min using a 3.2 mm thick specimen according to ASTM D790.

7. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from the thermoplastic resin composition according to any one of 1 to 6.

8. In the 7th embodiment, the molded article may be a water purifier filter housing.

The present invention has the effect of providing a thermoplastic resin composition which is excellent in impact resistance, rigidity, etc. and can reduce the residual amount of a vinyl cyanide-based compound, and a molded article formed therefrom.

Hereinafter, the present invention will be described in detail as follows.

The thermoplastic resin composition according to the present invention comprises (A) a rubber-modified aromatic vinyl-based copolymer resin; (B) zeolite; and (C) alkyl phosphates.

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

(A) Rubber-modified aromatic vinyl-based copolymer resin

The rubber-modified aromatic vinyl-based copolymer resin according to an embodiment of the present invention may include (A1) a rubber-modified vinyl-based graft copolymer and (A2) an aromatic vinyl-cyanide-based copolymer resin.

(A1) rubber-modified vinyl-based graft copolymer

The rubber-modified vinyl-based graft copolymer according to an embodiment of the present invention may be graft polymerization of a monomer mixture including an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to a rubbery polymer. For example, the rubber-modified vinyl-based graft copolymer can be obtained by graft polymerization of a monomer mixture containing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to a rubbery polymer. Graft polymerization may be performed by further including a monomer that imparts heat resistance. The polymerization may be performed by a known polymerization method such as emulsion polymerization or suspension polymerization. In addition, the rubber-modified vinyl-based graft copolymer may form a core (rubber polymer)-shell (copolymer of a monomer mixture) structure, but is not limited thereto.

In an embodiment, the rubbery polymer includes a diene-based rubber such as polybutadiene and poly(acrylonitrile-butadiene), and a saturated rubber hydrogenated to the diene-based rubber, isoprene rubber, and alkyl (meth)acryl having 2 to 10 carbon atoms. Late rubber, a copolymer of an alkyl (meth)acrylate having 2 to 10 carbon atoms and styrene, an ethylene-propylene-diene monomer terpolymer (EPDM), and the like can be exemplified. These may be applied alone or in mixture of two or more. For example, a diene-based rubber, a (meth)acrylate rubber, etc. may be used, and specifically, a butadiene-based rubber, a butyl acrylate rubber, or the like may be used.

In an embodiment, the rubbery polymer (rubber particles) may have an average particle size 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. In the above range, the thermoplastic resin composition may have excellent impact resistance and appearance characteristics. 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 rubbery polymer latex is filtered through a mesh to remove coagulation generated during polymerization of the rubbery polymer, and a solution of 0.5 g of latex and 30 ml of distilled water is poured into a 1,000 ml flask and distilled water is filled 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 with a light scattering particle size analyzer (malvern, nano-zs).

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

In an embodiment, the aromatic vinyl-based monomer may be graft copolymerized to the rubber polymer, and may include styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethylstyrene, vinylxylene, Monochlorostyrene, dichlorostyrene, dibromostyrene, vinyl naphthalene, etc. can be illustrated. These can be used individually or in mixture of 2 or more types. The content of the aromatic vinyl-based monomer may be about 10 to about 90% by weight, for example, about 20 to about 80% by weight, specifically about 50 to about 80% by weight based on 100% by weight of the monomer mixture. In the above range, the processability and impact resistance of the thermoplastic resin composition may be excellent.

In a specific embodiment, the cyanide-based monomer is copolymerizable with the aromatic vinyl-based monomer, and includes acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, fumaronitrile, and the like. can be exemplified. These can be used individually or in mixture of 2 or more types. For example, acrylonitrile, methacrylonitrile, etc. can be used. The content of the vinyl cyanide-based monomer may be from about 10 to about 90% by weight, for example, from about 20 to about 80% by weight, specifically from about 20 to about 50% by weight of 100% by weight of the monomer mixture. In the above range, the thermoplastic resin composition may have excellent chemical resistance, mechanical properties, and the like.

In embodiments, the monomer for imparting the processability and heat resistance may include (meth)acrylic acid, alkyl (meth)acrylate having 1 to 10 carbon atoms, maleic anhydride, N-substituted maleimide, and the like, but is not limited thereto. does not When the monomer for imparting the processability and heat resistance is used, the content thereof may be about 60% by weight or less, for example, about 1 to about 50% by weight based on 100% by weight of the monomer mixture. Within the above range, processability and heat resistance may be imparted to the thermoplastic resin composition without deterioration of other physical properties.

In a specific embodiment, as the rubber-modified vinyl-based graft copolymer, a butadiene-based rubber polymer is grafted with a styrene monomer as an aromatic vinyl compound and an acrylonitrile monomer as a vinyl cyanide compound (g-ABS), a butadiene-based polymer A copolymer (g-MBS) grafted with methyl methacrylate as a monomer for imparting processability and heat resistance to a styrene monomer, which is an aromatic vinyl-based compound, and a styrene monomer, an acrylonitrile monomer and methyl to a butadiene-based rubber polymer. A methacrylate-grafted copolymer (g-MABS), a butyl acrylate-based rubber polymer with an aromatic vinyl-based compound styrene monomer and a vinyl cyanide-based compound acrylonitrile monomer grafted onto an acrylate-styrene- An acrylonitrile graft copolymer (g-ASA) etc. can be illustrated.

In an embodiment, the rubber-modified vinyl-based graft copolymer may be included in an amount of about 18 to about 28% by weight, for example, about 20 to about 26% by weight of 100% by weight of the total rubber-modified aromatic vinyl-based copolymer resin. Within the above range, the thermoplastic resin composition may have excellent impact resistance, rigidity, fluidity (molding processability), and appearance characteristics.

(A2) Aromatic vinyl-vinyl cyanide copolymer resin

The aromatic vinyl-vinyl cyanide copolymer resin of the present invention can improve mechanical properties such as impact resistance and rigidity of the thermoplastic resin composition, and about 65 to about 70 wt % of an aromatic vinyl-based monomer and about a vinyl cyanide-based monomer 30 to about 35 weight percent of the polymer of the monomer mixture.

In an embodiment, the aromatic vinyl-vinyl cyanide-based copolymer resin is a copolymer comprising a repeating unit derived from an aromatic vinyl-based monomer and a repeating unit derived from a vinyl cyanide-based monomer, and the monomer mixture is subjected to a known polymerization method. It can be obtained by reacting accordingly.

In an embodiment, the aromatic vinyl-based monomer is polymerized with a vinyl cyanide-based monomer and the like to form a repeating unit derived from the aromatic vinyl-based monomer, and includes styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, pt-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, dibromostyrene, vinylnaphthalene, and the like may be exemplified, but the present invention is not limited thereto. These can be used individually or in mixture of 2 or more types. The content of the aromatic vinyl-based monomer (repeating unit derived from the aromatic vinyl-based monomer) is about 65 to about 70% by weight, for example, about 66% by weight of 100% by weight of the monomer mixture (aromatic vinyl-cyanide-based copolymer resin) to about 69% by weight. When the content of the aromatic vinyl-based monomer is less than about 65% by weight of 100% by weight of the monomer mixture, there is a fear that the residual amount of the vinyl cyanide compound in the thermoplastic resin composition increases, and when it exceeds about 70% by weight, the thermoplastic resin composition There exists a possibility that rigidity, impact resistance, etc. may fall.

In an embodiment, the vinyl cyanide monomer is polymerized with an aromatic vinyl monomer and the like to form a repeating unit derived from a vinyl cyanide monomer, and is acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile nitrile, α-chloroacrylonitrile, fumaronitrile, and the like can be exemplified. These can be used individually or in mixture of 2 or more types. For example, acrylonitrile, methacrylonitrile, etc. can be used. The content of the vinyl cyanide monomer (repeating unit derived from the vinyl cyanide monomer) is about 30 to about 35 wt %, for example, about 31 wt % of 100 wt % of the monomer mixture (aromatic vinyl-vinyl cyanide copolymer resin) to about 34% by weight. When the content of the vinyl cyanide-based monomer is less than about 30% by weight of 100% by weight of the monomer mixture, there is a fear that the rigidity, impact resistance, etc. of the thermoplastic resin composition may decrease, and when it exceeds about 35% by weight, the vinylcyanide-based compound There is a possibility that the residual amount may increase.

In an embodiment, the aromatic vinyl-vinyl cyanide copolymer resin is a copolymer of styrene and acrylonitrile, a copolymer of styrene, α-methylstyrene and acrylonitrile, and a copolymer of α-methylstyrene and acrylonitrile. It may include one or more types.

In an embodiment, the aromatic vinyl-vinyl cyanide copolymer resin has a weight average molecular weight measured by gel permeation chromatography (GPC) of about 100,000 to about 150,000 g/mol, for example, about 120,000 to about 130,000 g/mol. In the above range, the thermoplastic resin composition may have excellent injection property, impact resistance, fluidity, and the like.

(B) zeolite

Zeolite according to an embodiment of the present invention is applied together with an alkyl phosphate to a rubber-modified aromatic vinyl-based copolymer resin to reduce the residual amount of the vinyl cyanide compound without lowering the impact resistance and rigidity of the thermoplastic resin composition. that can be reduced.

In an embodiment, the zeolite has a pore size of about 0.1 to about 0.6 nm, such as about 0.2 to about 0.4 nm, and an average particle size of about 0.5 to about 6 μm, such as about 1 to about 1 nm. It may be a porous particle of about 5 μm. Within the above range, the residual amount of the vinyl cyanide compound in the thermoplastic resin composition can be reduced. Here, the average particle size of the zeolite was determined by the laser diffraction scattering method, and the particle size at the cumulative value of 50% was used as the average particle size.

In an embodiment, the zeolite may be included in an amount of about 0.1 to about 1 part by weight, for example, about 0.2 to about 0.8 part by weight, based on about 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin. When the content of the zeolite is less than about 0.1 parts by weight based on about 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin, the rigidity of the thermoplastic resin composition may decrease, and the residual amount of the vinyl cyanide-based compound may increase. , When it exceeds about 1 part by weight, there is a fear that the impact resistance of the thermoplastic resin composition may be lowered.

(C) alkyl phosphate

The alkyl phosphate according to one embodiment of the present invention is applied together with zeolite to the rubber-modified aromatic vinyl-based copolymer resin, and the residual amount of the vinyl cyanide compound can be reduced without lowering the impact resistance, rigidity, etc. of the thermoplastic resin composition. As such, an alkyl phosphate having 10 to 20 carbon atoms may be used.

In embodiments, the alkyl phosphate may be exemplified by dodecyl phosphate, tetradecyl phosphate, hexadecyl phosphate, octadecyl phosphate, and the like. These can be used individually or in mixture of 2 or more types. For example, octadecyl phosphate may be used.

In an embodiment, the alkyl phosphate may be included in an amount of about 0.05 to about 0.6 parts by weight, for example, about 0.1 to about 0.5 parts by weight, based on about 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin. When the content of the alkyl phosphate is less than about 0.05 parts by weight based on about 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin, the impact resistance of the thermoplastic resin composition is lowered, and there is a risk that the residual amount of the vinyl cyanide-based compound may increase. And, when it exceeds about 0.6 parts by weight, there is a fear that the impact resistance of the thermoplastic resin composition may be lowered.

In an embodiment, the weight ratio (B:C) of the zeolite (B) and the alkyl phosphate (C) may be about 0.5:1 to about 6:1, for example, about 1:1 to about 5:1. . In the above range, the thermoplastic resin composition may have excellent impact resistance, rigidity, and balance of physical properties thereof, and may reduce the residual amount of the vinyl cyanide-based compound.

The thermoplastic resin composition according to an embodiment of the present invention may further include an additive included in a conventional thermoplastic resin composition. The additive may include, but is not limited to, a flame retardant, an antioxidant, an anti-drip agent, a lubricant, a mold release agent, a nucleating agent, an antistatic agent, a stabilizer, a pigment, a dye, and a mixture thereof. When the additive is used, its 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 rubber-modified aromatic vinyl-based copolymer resin.

The thermoplastic resin composition according to one embodiment of the present invention is in the form of pellets that are melt-extruded at about 180 to about 280 ° C, for example, about 200 to about 260 ° C, by mixing the above components and using a conventional twin screw extruder. can

In an embodiment, the thermoplastic resin composition uses a headspace gas chromatograph mass spectrometer (Headspace GC/MS), and the residual amount of the vinyl cyanide compound present in 2 g of the thermoplastic resin composition specimen in the form of pellets measured at 250° C. is about 10 ppm or less, for example about 4 to about 8 ppm. When the residual amount of the vinyl cyanide monomer) exceeds about 10 ppm, it is not suitable for drinking water-related uses such as a water purifier filter housing due to harm to the human body.

In an embodiment, the thermoplastic resin composition has a notch Izod impact strength of about 16 to about 26 kgf·cm/cm, for example, about 18 to about 24 kgf·· cm/cm.

In an embodiment, the thermoplastic resin composition has a flexural strength of about 22,000 to about 26,000 kgf/cm ² , for example, about 23,000 to about 26,000 kgf/cm 2 , measured at a rate of 2.8 mm/min using a 3.2 mm thick specimen according to ASTM D790. about 25,000 kgf/cm ² .

The molded article according to the present invention is formed from the thermoplastic resin composition. The thermoplastic resin composition may be prepared in the form of pellets, and the manufactured pellets may be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such a molding method is well known by those of ordinary skill in the art to which the present invention pertains. The molded article has excellent impact resistance, rigidity, etc., and can reduce the residual amount of vinyl cyanide-based compounds, so it is useful as a drinking water related material such as a water purifier filter housing, a odor reduction material for automobile interior, a material for the interior of a refrigerator, and the like. In particular, the molded article is very useful as a water purifier filter housing.

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

Example

Hereinafter, the specifications of each component used in Examples and Comparative Examples are as follows.

(A) Rubber-modified aromatic vinyl-based copolymer resin

(A1) rubber-modified vinyl-based graft copolymer and (A2) aromatic vinyl-based copolymer resin were mixed and used in an amount as shown in Tables 1 and 2 below.

(A1) rubber-modified vinyl-based graft copolymer

A core-shell type graft copolymer (g-ABS) prepared by graft copolymerization of styrene and acrylonitrile (weight ratio: 75/25) to 55% by weight of butadiene rubber having an average particle size of 0.3 μm was used.

(A2) Aromatic vinyl-vinyl cyanide copolymer resin

(A2-1) A SAN resin in which 68 wt% of styrene and 32 wt% of acrylonitrile were polymerized (weight average molecular weight: 125,000 g/mol) was used.

(A2-2) A SAN resin (weight average molecular weight: 125,000 g/mol) in which 80% by weight of styrene and 20% by weight of acrylonitrile were polymerized was used.

(A2-3) A SAN resin in which 60% by weight of styrene and 40% by weight of acrylonitrile were polymerized (weight average molecular weight: 125,000 g/mol) was used.

(B) Zeolite (manufacturer: Aekyung Material, product name: APS-30, average particle size: 2 μm, pore size: 0.2 to 0.4 nm) was used.

(C) phosphate

(C1) As the alkyl phosphate, octadecyl phosphate (manufacturer: ADEKA, product name: ADK STAB AX-71) was used.

(C2) Triphenyl phosphate (manufacturer: DAIHACHI, product name: PHOSFLEX TPP) was used.

Examples 1 to 5 and Comparative Examples 1 to 7

After adding each of the above components in the amounts shown in Tables 1 and 2 below, extrusion was performed at 200° C. to prepare pellets. For extrusion, a twin-screw extruder with L/D=36 and a diameter of 45 mm was used, and the produced pellets were dried at 80° C. for 4 hours or more, and then injected in 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.

How to measure physical properties

(1) Residual amount of vinyl cyanide compound (unit: ppm): cyanide remaining in 2 g of the thermoplastic resin composition specimen in the form of pellets at 250° C. using a headspace gas chromatograph mass spectrometer (Headspace GC/MS) The content of the vinyl-based monomer was measured.

(2) Notched Izod impact strength (unit: kgf·cm/cm): According to ASTM D256, the notched Izod impact strength of a 1/4" thick specimen was measured.

(3) Flexural strength (unit: kgf/cm ² ): According to ASTM D790, the flexural strength of a 3.2 mm thick specimen was measured at a rate of 2.8 mm/min.

		Example
		One	2	3	4	5
(A) (wt%)	(A1)	23	23	23	23	23
	(A2-1)	77	77	77	77	77
	(A2-2)	-	-	-	-	-
	(A2-3)	-	-	-	-	-
(B) (parts by weight)		0.2	0.5	0.8	0.5	0.5
(C1) (parts by weight)		0.2	0.2	0.2	0.1	0.5
(C2) (parts by weight)		-	-	-	-	-
Residual amount of vinyl cyanide compound		8	5	4	5	4
Notched Izod Impact Strength		23	21	19	21	22
flexural strength		23,500	24,000	24,500	24,000	24,500

* Parts by weight: parts by weight based on 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin (A)

		comparative example
		One	2	3	4	5	6	7
(A) (wt%)	(A1)	23	23	23	23	23	23	23
	(A2-1)	-	-	77	77	77	77	77
	(A2-2)	77	-	-	-	-	-	-
	(A2-3)	-	77	-	-	-	-	-
(B) (parts by weight)		0.5	0.5	0.05	1.2	0.5	0.5	0.5
(C1) (parts by weight)		0.2	0.2	0.2	0.2	0.03	0.9	-
(C2) (parts by weight)		-	-	-	-	-	-	0.2
Residual amount of vinyl cyanide compound		4	15	12	3	11	4	11
Notched Izod Impact Strength		14	26	24	12	19	14	18
flexural strength		21,000	25,000	21,000	23,000	24,000	24,000	24,000

* Parts by weight: parts by weight based on 100 parts by weight of the rubber-modified aromatic vinyl-based copolymer resin (A)

From the above results, it can be seen that the thermoplastic resin compositions (Examples 1 to 5) of the present invention are excellent in impact resistance, rigidity, and the like, and can reduce the residual amount of the vinyl cyanide-based compound.

On the other hand, instead of the aromatic vinyl-vinyl cyanide copolymer resin (A2-1) of the present invention, an aromatic vinyl-vinyl cyanide copolymer resin (A2-2) having a vinyl cyanide monomer content less than the range of the present invention is applied. In the case of Example 1, it can be seen that the impact resistance, rigidity, etc. of the thermoplastic resin composition are reduced, and the aromatic vinyl-vinyl cyanide copolymer resin (A2-3) having a vinyl cyanide-based monomer content exceeding the range of the present invention is applied. In the case of Comparative Example 2, it can be seen that the residual amount of the vinyl cyanide-based compound in the thermoplastic resin composition increased. In the case of Comparative Example 3 in which a small amount of zeolite was applied, it was found that the rigidity of the thermoplastic resin composition was lowered and the residual amount of the vinyl cyanide-based compound was increased, and in Comparative Example 4 in which an excessive amount of zeolite was applied, the thermoplastic resin composition It can be seen that the impact resistance and the like are lowered. In addition, in the case of Comparative Example 5 in which a small amount of alkyl phosphate was applied, it can be seen that the impact resistance of the thermoplastic resin composition was lowered, and the residual amount of the vinyl cyanide-based compound was increased. It can be seen that the impact resistance of the resin composition is lowered, and in the case of Comparative Example 7 in which triphenyl phosphate (C2) is applied instead of the alkyl phosphate of the present invention, the residual amount of the vinyl cyanide-based compound in the thermoplastic resin composition is increased. have.

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

Claims (8)

1. About 100 parts by weight of a rubber-modified aromatic vinyl-based copolymer resin comprising about 18 to about 28% by weight of a rubber-modified vinyl-based graft copolymer, and about 72 to about 82% by weight of an aromatic vinyl-cyanide-based copolymer resin;

   about 0.1 to about 1 part by weight of zeolite; and

   A thermoplastic resin composition comprising; about 0.05 to about 0.5 parts by weight of an alkyl phosphate having 10 to 20 carbon atoms,

   The aromatic vinyl-vinyl cyanide copolymer resin is a polymer of a monomer mixture comprising about 65 to about 70 wt % of an aromatic vinyl-based monomer and about 30 to about 35 wt % of a vinyl cyanide-based monomer,

   The thermoplastic resin composition uses a headspace gas chromatograph mass spectrometer (Headspace GC/MS), and the residual amount of the vinyl cyanide compound present in 2 g of the thermoplastic resin composition specimen in the form of pellets measured at 250° C. is about 10 ppm or less. Thermoplastic resin composition characterized in that.
2. According to claim 1, wherein the rubber-modified vinyl-based graft copolymer is a rubber-modified vinyl-based graft copolymer is a rubbery polymer, characterized in that the graft polymerization of a monomer mixture comprising an aromatic vinyl-based monomer and a vinyl cyanide-based monomer. A thermoplastic resin composition.
3. The thermoplastic resin composition according to claim 1 or 2, wherein the aromatic vinyl-vinyl cyanide copolymer resin has a weight average molecular weight of about 100,000 to about 150,000 g/mol as measured by gel permeation chromatography (GPC). .
4. 4. The zeolite according to any one of claims 1 to 3, wherein the zeolite is porous particles having a pore size of about 0.1 to about 0.6 nm and an average particle size of about 0.5 to about 6 μm. A thermoplastic resin composition.
5. 5. The thermoplastic resin composition of any one of claims 1 to 4, wherein the weight ratio of the zeolite and the alkyl phosphate is from about 1:1 to about 5: 1.
6. The method of any one of claims 1 to 5, wherein the thermoplastic resin composition has a notch Izod impact strength of about 16 to about 24 kgf cm/cm of a 1/4" thick specimen measured according to ASTM D256, According to ASTM D790, the thermoplastic resin composition, characterized in that ^{the flexural strength of about 22,000 to about 26,000 kgf/cm 2} measured at a rate of 2.8 mm/min using a 3.2 mm thick specimen.
7. A molded article, characterized in that it is formed from the thermoplastic resin composition according to any one of claims 1 to 6.
8. The molded article according to claim 7, wherein the molded article is a water purifier filter housing.