WO2020111551A1 - Thermoplastic resin composition and molded product prepared therefrom - Google Patents

Abstract

A thermoplastic resin composition of the present invention comprises: about 100 parts by weight of a polyester resin; about 15 to about 50 parts by weight of a polyolefin resin; about 30 to about 150 parts by weight of a glass fiber; and about 10 to about 40 parts by weight of a modified olefin-based copolymer, the modified olefin-based copolymer including an epoxy-modified olefin-based copolymer and a maleic anhydride-modified olefin-based copolymer, wherein the weight ratio of the epoxy-modified olefin-based copolymer and the maleic anhydride-modified olefin-based copolymer is about 1 : 0.3 to about 1 : 3. The thermoplastic resin composition is excellent in terms of adhesion to metal, rigidity, and impact resistance and has low permittivity.

Description

Thermoplastic resin composition and molded article produced therefrom

The present invention relates to a thermoplastic resin composition and a molded article produced therefrom. More specifically, the present invention relates to a thermoplastic resin composition having excellent metal bonding properties, rigidity, impact resistance, etc., and having a low dielectric constant, and a molded article manufactured therefrom.

As engineering plastics, polyester resins, copolymers thereof, and blends thereof exhibit useful properties, and are applied to various fields including interior and exterior materials of electrical and electronic products. However, the polyester resin has a problem of slow crystallization rate, low mechanical strength, and poor impact resistance.

In order to solve this, an attempt was made to improve mechanical strength and impact resistance by mixing an additive such as an inorganic filler with a polyester resin. For example, polybutylene terephthalate (PBT) material reinforced with an inorganic filler such as glass fiber is widely used as a housing for automobile parts or mobile phones. However, these materials also have limitations in improving the impact resistance, and there is a fear of deterioration in physical properties due to a decrease in chemical resistance when contacted with an acidic or basic solution.

In addition, when the polyester resin is used for applications such as a housing of a mobile phone, there is a problem in that the dielectric constant is high and deteriorates communication performance. In order to solve this, a method of introducing a polyolefin resin has been introduced, but when a polyester resin and a polyolefin resin are mixed, mechanical properties and metal bonding properties may be deteriorated.

Therefore, there is a need to develop a thermoplastic resin composition having excellent metal bonding properties, rigidity, impact resistance, and a low dielectric constant.

Background art of the present invention is disclosed in Japanese Patent Publication No. 2012-533645 and the like.

An object of the present invention is to provide a thermoplastic resin composition excellent in metal bonding property, rigidity, impact resistance, and the like, and having a low dielectric constant.

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 is about 100 parts by weight of a polyester resin; About 15 to about 50 parts by weight of a polyolefin resin; About 30 to about 150 parts by weight of glass fiber; And about 10 to about 40 parts by weight of the modified olefin-based copolymer, wherein the modified olefin-based copolymer includes an epoxy-modified olefin-based copolymer and a maleic anhydride-modified olefin-based copolymer, and the epoxy-modified olefin-based copolymer and The maleic anhydride-modified olefin-based copolymer has a weight ratio of about 1:0.3 to about 1:3.

2. In the above 1 embodiment, the polyester resin may include one or more of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate and polycyclohexylenedimethylene terephthalate. .

3. In the above 1 or 2 embodiment, the polyester resin may be polybutylene terephthalate.

4. In the above 1 to 3 embodiments, the polyolefin resin may include at least one of polypropylene, polyethylene, and propylene-ethylene copolymer.

5. In the above 1 to 4 embodiments, the epoxy-modified olefin-based copolymer is an epoxy-modified alkylene-alkyl copolymer of an epoxy compound in an olefin-based copolymer in which an alkylene monomer and an alkyl (meth)acrylate monomer are copolymerized. )Acrylate copolymers.

6. In the above 1 to 5 embodiments, the epoxy compound may include one or more of glycidyl (meth)acrylate, allyl glycidyl ether, and 2-methylallyl glycidyl ether.

7. In the above 1 to 6 embodiments, the epoxy-modified olefin-based copolymer is a glycidyl (meth)acrylate-modified ethylene-butyl acrylate copolymer, glycidyl (meth)acrylate-modified ethylene-methyl acrylate copolymer Copolymer, glycidyl (meth) acrylate-modified ethylene-ethyl acrylate copolymer may include at least one.

8. In the above 1 to 7 embodiments, the maleic anhydride-modified olefin-based copolymer is a maleic anhydride-modified alkylene-α-olefin copolymer obtained by graft copolymerizing maleic anhydride with an alkylene-α-olefin copolymer. It can contain.

9. In the above 1 to 8 embodiments, the maleic anhydride-modified olefin-based copolymer may include at least one of maleic anhydride-modified ethylene-butene copolymer and maleic anhydride-modified ethylene-octene copolymer.

10. In the above 1 to 9 embodiments, the thermoplastic resin composition may have a metal bonding force measured according to ISO 19095 of about 20 to about 50 MPa.

11. In the above 1 to 10 embodiments, the thermoplastic resin composition may have a tensile strength of about 1,000 to about 2,000 kgf/cm ² of a 3.2 mm thick specimen measured under 5 mm/min conditions according to ASTM D638.

12. In the above 1 to 11 embodiments, the thermoplastic resin composition may have a notched Izod impact strength of about 10 to about 30 kgf·cm/cm of a thickness 1/8” specimen measured according to ASTM D256.

13. In the above 1 to 12 embodiments, the thermoplastic resin composition may have a dielectric constant of 2.5 mm × 50 mm × 90 mm sized specimen measured at 3.1 GHz, in accordance with IEC 60250, of about 3.8 or less.

14. Another aspect of the 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 13.

The present invention has the effect of the invention to provide a thermoplastic resin composition excellent in metal bonding property, rigidity, impact resistance, and the like, and having a low dielectric constant and a molded article formed therefrom.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin composition according to the present invention includes (A) a polyester resin; (B) polyolefin resins; (C) glass fibers; And (D) a modified olefin-based copolymer.

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

(A) Polyester resin

As the polyester resin of the present invention, a polyester resin used in a common thermoplastic resin composition can be used. For example, the polyester resin is a dicarboxylic acid component, terephthalic acid (TPA), isophthalic acid (IPA), 1,2-naphthalene dicarboxylic acid, 1,4-naphthalene dicar Carboxylic acid, 1,5-naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, 1,7-naphthalene dicarboxylic acid, 1,8-naphthalene dicarboxylic acid, 2,3-naphthalene dicarboxylic acid Aromatic dicarboxylic acids such as carboxylic acid, 2,6-naphthalene dicarboxylic acid and 2,7-naphthalenedicarboxylic acid, dimethyl terephthalate (DMT), dimethyl isophthalate, dimethyl- 1,2-naphthalate, dimethyl-1,5-naphthalate, dimethyl-1,7-naphthalate, dimethyl-1,7-naphthalate, dimethyl-1,8-naphthalate, dimethyl-2,3-na Aromatic dicarboxylates such as phthalate, dimethyl-2,6-naphthalate, and dimethyl-2,7-naphthalate, and other diol components, such as ethylene glycol, 1,2-propylene glycol, and 1,3-propylene Glycol, 2,2-dimethyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,5-pentanediol, 1,6-hexanediol, cyclic alkyl It can be obtained by polycondensing Ren diol or the like.

In an embodiment, the polyester resin is polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) and polytrimethylene terephthalate (PTT), polycyclohexylenedimethylene terephthalate ( PCT).

In an embodiment, the polyester resin is a resin in which at least about 10% by weight of polyethylene terephthalate and at least about 90% by weight of polybutylene terephthalate are mixed, for example, polybutylene terephthalate, or polyethylene terephthalate about 1 to It may be a resin mixed with about 10% by weight and about 90 to about 99% by weight of polybutylene terephthalate. In the above range, the impact resistance of the thermoplastic resin composition, appearance characteristics, metal bonding (metal bonding strength), and the like may be excellent.

In an embodiment, the polyester resin of the present invention has an intrinsic viscosity [η] measured using an o-chlorophenol solvent at 25° C. of about 0.5 to about 1.5 dl/g, for example about 0.6 to about 1.3 dl/ It can be g. In the above range, the mechanical properties and the like of the thermoplastic resin composition may be excellent.

(B) Polyolefin resin

The polyolefin resin of the present invention can improve the fluidity, chemical resistance, low specific gravity, and the like of the thermoplastic resin composition, and lower the dielectric constant, and a conventional polyolefin resin can be used. For example, polyethylene such as low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylate copolymer , Polyethylene-based resins such as mixtures thereof; Polypropylene-based resins such as polypropylene, propylene-ethylene copolymer, propylene-1-butene copolymer, and mixtures thereof; Polymers crosslinking them; A blend comprising polyisobutene; Combinations of these and the like can be used. Specifically, polypropylene, polyethylene, propylene-ethylene copolymer, and combinations thereof can be used.

In embodiments, the polyolefin resin may have a weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of about 10,000 to about 400,000 g/mol, for example, about 15,000 to about 350,000 g/mol. The mechanical strength, molding processability, etc. of the thermoplastic resin composition in the above range may be excellent, and the dielectric constant may be lowered.

In an embodiment, the polyolefin resin may be included in an amount of about 15 to about 50 parts by weight, for example, about 20 to about 45 parts by weight, specifically about 25 to about 40 parts by weight with respect to about 100 parts by weight of the polyester resin . When the content of the polyolefin resin is less than about 15 parts by weight with respect to about 100 parts by weight of the polyester resin, the dielectric constant of the thermoplastic resin composition may increase, and when it exceeds about 50 parts by weight, impact resistance of the thermoplastic resin composition , Stiffness, metal bonding properties, etc. may be deteriorated.

(C) fiberglass

The glass fiber of the present invention is capable of improving mechanical properties such as rigidity of the thermoplastic resin composition, and glass fibers used in conventional thermoplastic resin compositions can be used.

In an embodiment, the glass fiber may be in the form of a fiber, it may have a cross-section of various shapes such as circular, oval, rectangular. For example, it may be desirable in terms of mechanical properties to use fibrous glass fibers of circular and/or rectangular cross-section.

In an embodiment, the glass fiber of the circular cross section may have a cross section diameter of about 5 to about 20 μm and a length of about 2 to about 20 mm before processing, wherein the glass fiber of the rectangular cross section has an aspect ratio of the cross section (long diameter of the cross section/ The short diameter of the cross section) may be about 1.5 to about 10, the short diameter may be about 2 to about 10 μm, and the length before processing may be about 2 to about 20 mm. In the above range, the stiffness and processability of the thermoplastic resin composition may be improved.

In an embodiment, the glass fiber may be treated with a conventional surface treatment agent.

In an embodiment, the glass fiber may be included in an amount of about 30 to about 150 parts by weight, for example, about 35 to about 130 parts by weight, specifically about 40 to about 100 parts by weight based on about 100 parts by weight of the polyester resin. . When the content of the glass fiber is less than about 30 parts by weight with respect to about 100 parts by weight of the polyester resin, there is a fear that the stiffness, impact resistance, etc. of the thermoplastic resin composition is lowered, and when it exceeds about 150 parts by weight, the thermoplastic resin There is a possibility that the workability, appearance characteristics, and the like of the composition are lowered.

(D) Modified olefin copolymer

The modified olefin-based copolymer of the present invention is capable of improving impact resistance, stiffness, and the like, and lowering the dielectric constant without deteriorating the metal bonding property of the thermoplastic resin composition, (D1) epoxy-modified olefin-based copolymer and (D2) male Acid anhydride-modified olefin-based copolymers.

(D1) Epoxy-modified olefin-based copolymer

The epoxy-modified olefin-based copolymer according to an embodiment of the present invention is a reactive olefin-based copolymer obtained by copolymerizing an epoxy compound, which is a reactive functional group, with an olefin-based copolymer, and is applied together with a maleic anhydride-modified olefin-based copolymer to provide a thermoplastic resin. It is possible to improve the impact resistance and rigidity of the composition.

In an embodiment, the epoxy compound may include glycidyl (meth)acrylate, allylglycidyl ether, 2-methylallylglycidyl ether, mixtures thereof, and the like.

In an embodiment, the epoxy-modified olefin-based copolymer may be a copolymer of the epoxy compound to an olefin-based copolymer in which an alkylene monomer and an alkyl (meth)acrylate monomer are copolymerized. As the alkylene monomer, alkylene having 2 to 10 carbon atoms may be used, for example, ethylene, propylene, isopropylene, butylene, isobutylene, octene, combinations thereof, and the like. As the alkyl (meth)acrylate monomer, an alkyl (meth)acrylate having 1 to 8 carbon atoms may be used, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, combinations thereof, and the like can be used.

In an embodiment, the epoxy-modified olefin-based copolymer may include a glycidyl (meth)acrylate-modified ethylene-butyl acrylate copolymer (glycidyl (meth)acrylate modified ethylene-butyl acrylate copolymer).

In an embodiment, the epoxy-modified olefin-based copolymer has a flow-flow index (Melt-flow index) measured in accordance with ASTM D1238, 190°C, 2.16 kg condition, from about 1 to about 50 g/10 min, for example About 2 to about 25 g/10 minutes.

(D2) Maleic anhydride modified olefin copolymer

Maleic anhydride-modified olefin-based copolymer according to an embodiment of the present invention is a reactive olefin-based copolymer obtained by graft copolymerizing maleic anhydride as a reactive functional group with an olefin-based copolymer, and epoxy-modified olefin-based copolymer It is applied together with the coalescence to improve the impact resistance and chemical resistance of the thermoplastic resin composition.

In an embodiment, the maleic anhydride-modified olefin-based copolymer may be a graft copolymerization of maleic anhydride to an olefin-based copolymer in which two or more alkylene monomers are copolymerized. As the alkylene monomer, alkylene having 2 to 10 carbon atoms may be used, for example, ethylene, propylene, isopropylene, butylene, isobutylene, octene, combinations thereof, and the like.

In an embodiment, the maleic anhydride-modified olefin-based copolymer may include maleic anhydride-modified ethylene-α-olefin copolymer obtained by graft copolymerizing maleic anhydride with an alkylene-α-olefin copolymer.

In an embodiment, the maleic anhydride modified olefin-based copolymer may include maleic anhydride modified ethylene-butene copolymer.

In an embodiment, the maleic anhydride-modified olefin-based copolymer has a flow-flow index (Melt-flow index) of about 0.5 to about 20 g/10 min, measured under conditions of 190° C. and 2.16 kg, according to ASTM D1238. For example, it may be about 1 to about 10 g/10 minutes.

In embodiments, the modified olefin-based copolymer is about 10 to about 40 parts by weight, for example about 15 to about 35 parts by weight, specifically about 20 to about 30 parts by weight, based on about 100 parts by weight of the polyester resin Can be included. When the content of the modified olefin-based copolymer is less than about 10 parts by weight with respect to about 100 parts by weight of the polyester resin, there is a fear that the impact resistance, stiffness, metal bonding properties, etc. of the thermoplastic resin composition may decrease, and about 40 parts by weight When exceeded, there is a concern that the processability, appearance characteristics, and the like of the thermoplastic resin composition may be deteriorated.

In an embodiment, the weight ratio (D1:D2) of the epoxy-modified olefin-based copolymer (D1) and the maleic anhydride-modified olefin-based copolymer (D2) is about 1:0.3 to about 1:3, for example about 1 : 0.5 to about 1: 2, specifically about 1: 0.5 to about 1: 1.5. When the weight ratio is less than about 1: 0.3 or more than about 1: 3, there is a fear that the impact resistance, stiffness, and metal bonding properties of the thermoplastic resin composition are lowered.

In an embodiment, the weight ratio (C:D) of the glass fiber and the modified olefin-based copolymer may be about 2:1 to about 4:1. In the above range, impact resistance, rigidity, and the like of the thermoplastic resin composition may be more excellent.

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 additives may include, but are not limited to, flame retardants, antioxidants, anti-dropping agents, lubricants, release agents, nucleating agents, antistatic 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 with respect to about 100 parts by weight of the polyester resin.

The thermoplastic resin composition according to one embodiment of the present invention is a pellet form in which the above components are mixed 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 an embodiment, the thermoplastic resin composition may have a metal bonding force measured according to ISO 19095 of about 20 to about 50 MPa, for example, about 25 to about 35 MPa.

In an embodiment, the thermoplastic resin composition according to ASTM D638, tensile strength of a specimen having a thickness of 3.2 mm measured at a condition of 5 mm/min is about 1,000 to about 2,000 kgf/cm ² , for example, about 1,100 to about 1,700 kgf /cm ² .

In an embodiment, the thermoplastic resin composition has a notched Izod impact strength of a thickness 1/8" specimen measured according to ASTM D256 of about 10 to about 30 kgfcm/cm, for example, about 12 to about 20 kgfcm It can be /cm.

In an embodiment, the thermoplastic resin composition may have a dielectric constant of 2.5 mm×50 mm×90 mm sized specimen measured at 3.1 GHz, based on IEC 60250, of about 3.8 or less, for example, about 2.9 to about 3.6.

The molded article according to the present invention is formed from the thermoplastic resin composition. The thermoplastic resin composition may be manufactured in a pellet form, and the manufactured 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 to which this invention pertains. The molded article is excellent in metal bonding property, rigidity, impact resistance, etc., and has a low dielectric constant, and is useful as a metal bonding material for portable devices such as housings for electric and electronic products and smartphones.

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

Example

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

(A) Polyester resin

Polybutylene terephthalate (PBT, manufacturer: China National BlueStar) having an intrinsic viscosity [η] of 1.3 dl/g measured using an o-chloro phenol solvent at 25°C was used.

(B) Polyolefin resin

A polypropylene resin (manufacturer: Lotte Chemical) having a weight average molecular weight (Mw) of 248,600 g/mol was used.

(C) fiberglass

A glass fiber (manufacturer: Nitto Boseki) of a rectangular cross section having a short diameter of 7 µm, an aspect ratio of 4 in cross section, and a length of 3 mm before processing was used.

(D) Modified olefin copolymer

(D1) Epoxy-modified olefin-based copolymer

Glycidyl methacrylate modified ethylene-butyl acrylate copolymer (manufacturer: DuPont, product name: Elvaroy PTW) was used.

(D2) Maleic anhydride modified olefin copolymer

A maleic anhydride-modified ethylene-butene copolymer (manufacturer: Mitsui Chemicals, product name: Tafmer A6040) was used.

(D3) Modified olefin-based copolymer

Ethylene-methyl acrylate copolymer (manufacturer: DuPont, product name: Elvaroy AC 1224) was used.

Examples 1 to 4 and Comparative Examples 1 to 7

After adding each component to the contents as described in Tables 1 and 2, pellets were prepared by extruding at 260°C. Extrusion was performed using a twin-screw extruder with a L/D=44 and a diameter of 45 mm, and the prepared pellets were dried at 80°C for 4 hours or more, followed by injection molding in a 6 oz injection machine (molding temperature 270°C, mold temperature: 120°C). Specimens were prepared. The physical properties of the prepared specimens were evaluated in the following manner, and the results are shown in Tables 1 and 2 below.

Method for measuring properties

(1) Metal bonding strength (unit: MPa): According to ISO 19095, the bonding strength was measured after bonding the metal specimen and the thermoplastic resin composition specimen. Here, the metal specimen used was an aluminum specimen with TRI surface treatment of Geo Nation Co. to facilitate bonding with the resin composition specimen. In addition, the metal and thermoplastic resin composition specimens used were 1.2 cm × 4 cm × 0.3 cm in size, and 1.2 cm × 0.3 cm cross-sections were attached to each other to measure bonding strength.

(2) Tensile strength (unit: kgf/cm ² ): According to ASTM D638, tensile strength (TS) of a 3.2 mm thick specimen under 5 mm/min was measured.

(3) Flexural modulus (unit: kgf/cm2): According to ASTM D790, flexural modulus (FM) of a 6.4 mm thick specimen was measured at a rate of 2.8 mm/min.

(4) Notched Izod Impact Strength (Unit: kgf·cm/cm): Notched Izod impact strength of a 1/8" thick specimen was measured according to ASTM D256.

(5) Dielectric constant: According to IEC 60250, the dielectric constant of a 2.5 mm × 50 mm × 90 mm size specimen at 3.1 GHz was measured.

	Example
	One	2	3	4
(A) (parts by weight)	100	100	100	100
(B) (parts by weight)	40	33	25	25
(C) (parts by weight)	40	67	100	100
(D1) (parts by weight)	10	11	12.5	12.5
(D2) (parts by weight)	10	11	12.5	18.8
(D3) (parts by weight)	-	-	-	-
Metal bonding power	29	30	30	31
The tensile strength	1150	1380	1510	1600
Flexural modulus	77000	99900	122000	12000
Notched Izod Impact Strength	13.5	14.0	14.2	14.5
permittivity	3.1	3.3	3.5	3.5

	Comparative example
	One	2	3	4	5	6	7
(A) (parts by weight)	100	100	100	100	100	100	100
(B) (parts by weight)	-	33	33	33	33	33	33
(C) (parts by weight)	67	67	67	67	67	67	67
(D1) (parts by weight)	11	22	-	17	5	-	11
(D2) (parts by weight)	11	-	22	5	17	11	-
(D3) (parts by weight)	-	-	-	-	-	11	11
Metal bonding power	23	18	12	19	18	11	16
The tensile strength	1330	1210	850	1180	940	970	1290
Flexural modulus	99400	95400	75700	84800	91000	81000	94300
Notched Izod Impact Strength	12.3	13.1	7.3	12.8	13.0	7.8	10.9
permittivity	4.0	3.5	3.4	3.5	3.5	3.4	3.8

From the above results, it can be seen that the thermoplastic resin composition of the present invention has excellent metal bonding properties (metal bonding strength), rigidity (tensile strength, flexural modulus), impact resistance (notched Izod impact strength), and dielectric constant of 3.8 or less.

On the other hand, in the case of Comparative Example 1 without using a polyolefin resin, it can be seen that the dielectric constant is high, and only one type of modified olefin-based copolymer is used, or when applied outside the weight ratio range of the present invention (Comparative Examples 2 and 3) , 4 and 5), it can be seen that the metal bonding property is lowered, and in particular, when only maleic anhydride modified olefin copolymer (D2) is applied (Comparative Example 3), in addition to the metal bonding property, stiffness, impact resistance, etc. are lowered. Able to know. When applying the modified olefin-based copolymer (D3) instead of the epoxy-modified olefin-based copolymer (D1) of the present invention (Comparative Example 6), it can be seen that the metal bonding strength, rigidity, impact resistance, etc. were lowered, and the present invention When the modified olefin-based copolymer (D3) was applied instead of the maleic anhydride-modified olefin-based copolymer (D2) (Comparative Example 7), it was found that the metal bonding strength and the like were lowered and the dielectric constant was increased.

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 considered to be included in the scope of the present invention.

Claims (14)

1. About 100 parts by weight of a polyester resin;

   About 15 to about 50 parts by weight of a polyolefin resin;

   About 30 to about 150 parts by weight of glass fiber; And

   Modified olefin-based copolymer containing about 10 to about 40 parts by weight,

   The modified olefin-based copolymer includes an epoxy-modified olefin-based copolymer and a maleic anhydride-modified olefin-based copolymer, and the weight ratio of the epoxy-modified olefin-based copolymer and the maleic anhydride-modified olefin-based copolymer is about 1: 0.3. To about 1: 3, characterized in that the thermoplastic resin composition.
2. The method of claim 1, wherein the polyester resin is polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate and polycyclohexylene dimethylene terephthalate, characterized in that it comprises at least one of Thermoplastic resin composition.
3. The thermoplastic resin composition according to claim 1, wherein the polyester resin is polybutylene terephthalate.
4. The method of claim 1, wherein the polyolefin resin is a thermoplastic resin composition comprising at least one of polypropylene, polyethylene, propylene-ethylene copolymer.
5. The epoxy-modified olefin-based copolymer of claim 1, wherein the epoxy-modified olefin-based copolymer is an epoxy-modified alkylene-alkyl (meth)acrylate copolymerized with an olefin-based copolymer of an alkylene monomer and an alkyl (meth)acrylate monomer. A thermoplastic resin composition comprising a coalescence.
6. The epoxy resin composition of claim 5, wherein the epoxy compound comprises at least one of glycidyl (meth)acrylate, allyl glycidyl ether, and 2-methylallyl glycidyl ether.
7. The thermoplastic resin composition according to claim 1, wherein the epoxy-modified olefin-based copolymer comprises a glycidyl (meth)acrylate-modified ethylene-butyl acrylate copolymer.
8. The method of claim 1, wherein the maleic anhydride-modified olefin-based copolymer comprises a maleic anhydride-modified alkylene-α-olefin copolymer grafted with maleic anhydride to an alkylene-α-olefin copolymer. Thermoplastic resin composition.
9. The thermoplastic resin composition of claim 1, wherein the maleic anhydride-modified olefin-based copolymer comprises maleic anhydride-modified ethylene-butene copolymer.
10. The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition has a metal bonding strength measured in accordance with ISO 19095 of about 20 to about 50 MPa.
11. The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a tensile strength of about 1,000 to about 2,000 kgf/cm ² of a 3.2 mm thick specimen measured under a condition of 5 mm/min according to ASTM D638. .
12. The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a notched Izod impact strength of about 10 to about 30 kgf·cm/cm of a thickness 1/8” specimen measured according to ASTM D256.
13. The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a dielectric constant of 2.5 mm × 50 mm × 90 mm sized specimen measured at 3.1 GHz of about 3.8 or less based on IEC 60250.
14. A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 13.