KR20070055051A - Composition of polyester resin - Google Patents

Abstract

The present invention relates to a polyester resin composition having excellent surface gloss and processability, and more specifically, (A) 33 to 75 wt% of polybutylene terephthalate resin (PBT), and (B) polyethylene terephthalate resin (PET) 10 ~ 40% by weight, (C) 8 to 15% by weight of bromine-based flame retardant as the main flame retardant, (D) 2 to 10% by weight of antimony secondary flame retardant, and (E) 0.1 to 2% by weight of heat-resistant fatty acid ester It is related with the polyester resin composition containing 10-60 weight part of (F) inorganic fillers with respect to 100 weight part.

The polyester resin composition according to the present invention includes a mixed resin of polybutylene terephthalate and polyethylene terephthalate, a flame retardant and flame retardant aid imparting flame retardancy, a heat-resistant fatty acid ester that can improve processability, and also has strength, heat resistance And inorganic fillers that impart dimensional stability to improve mechanical strength and heat resistance, as well as surface gloss and processability, which can be suitably used as a case for automobiles, electrical and electronic parts, and microswitch housings for microwave ovens and TVs. Can also be used as.

Surface gloss, processability, polybutylene terephthalate, polyethylene terephthalate, brominated flame retardants, heat-resistant fatty acid esters, inorganic fillers, polyesters.

Description

Polyester resin composition {Composition Of Polyester resin}

The present invention relates to a polyester resin composition having excellent surface gloss and processability, comprising a mixed resin of polybutylene terephthalate and polyethylene terephthalate, a flame retardant and flame retardant aid imparting flame retardancy, and a heat-resistant fatty acid ester capable of improving processability. In addition, by including an inorganic filler that provides strength, heat resistance, and dimensional stability, the mechanical strength and heat resistance as well as surface gloss and processability can be improved at the same time, and can be suitably used as a case for automobile and electric / electronic parts. It relates to a polyester resin composition that can also be used as a microswitch housing such as TV.

In general, polybutylene terephthalate resin (hereinafter referred to as PBT) is widely used in automobiles, electrical and electronic components, etc. because of excellent heat resistance, chemical resistance, electrical properties, mechanical strength, and molding processability. PBT, like other crystalline resins, has an effect of greatly improving mechanical properties and heat resistance, such as tensile strength and flexural strength, by adding inorganic fillers such as glass fibers, talc, mica, and layered silicates. However, when a large amount of inorganic fillers such as glass fiber, talc, mica, and layered silicate were added, the inorganic fillers protruded from the surface of the final molded product, which was very poor in appearance, and thus it was difficult to apply to a molded article requiring a beautiful molded surface.

On the other hand, polyethylene terephthalate resin (hereinafter referred to as PET) is relatively low in releasability and slow in crystallization rate, so that the use of a crystal nucleating agent and a crystallization promoter is required to improve this.

In general, in order to improve the molded article surface of the inorganic filler-reinforced PBT, a technique in which PBT / PET alloy is used by mixing PET having a relatively slow crystallization rate has been used. Such PBT / PET alloys have been commercialized in large quantities by improving the surface properties due to balanced physical properties, crystallization rate control, and the like.

In addition, flame retardancy is strongly required in parts requiring stability against fire. Polyesters including PBT and PET generally have a property of easily burning when exposed to fire, and thus a composition containing a flame retardant is applied. It is becoming. Such PBT is applied to inorganic flame retardants such as antimony trioxide to flame retardants containing decabrodipetylether, brominated polycarbonate oligomers, brominated epoxy oligomers, or brominated polyacrylate organic halogens in applications requiring flame retardancy, including electrical and electronic devices. It has been used as a flame retardant composition made by mixing. However, since the content of the main flame retardant and the auxiliary flame retardant used for the flame retardant is up to 10 to 30% by weight, the content of the main resin is reduced, so that workability is remarkably degraded, thereby making it difficult to obtain a molded article having an excellent appearance.

Conventional techniques that have improved the surface properties of polyester resins known to date include resin compositions for reinforcing glass fibers in blends of PBT and PET to suppress distortion of the molded article, US Pat. No. 4,460,731, strength of PBT and PET blends, Resin composition which suppresses the transesterification reaction which added hardening, glass fiber, and a flame retardant (halogen type compound, an antimony flame retardant adjuvant) <US Patent No. 4,370,438>, and PBT, PET, polycarbonate (PC), and styrene-acrylo The resin composition which contains an inorganic filler with respect to a nitrile (SAN) <Korea Patent Registration No. 10-0431025> etc. is mentioned.

However, such a conventional technique cannot simultaneously satisfy surface gloss and processability, and in order to have a beautiful appearance quality, it is necessary to proceed with post-processing such as coating, painting, and deposition on the surface of a molded product. Therefore, there is a problem such as an increase in cost due to the need of such a post-process, a decrease in physical properties due to chemical treatment, a decrease in electrical characteristics.

Accordingly, the present inventors have been researched to solve the above problems, as a result of the mixed resin of polybutylene terephthalate and polyethylene terephthalate, flame retardant and flame retardant aids to impart flame retardant, heat-resistant fatty acid ester that can improve processability The present invention was completed by confirming that a polyester resin composition having excellent surface gloss and processability as well as mechanical strength and heat resistance was prepared by including an inorganic filler that provides strength, heat resistance, and dimensional stability.

Accordingly, an object of the present invention is a polyester resin including a mixed resin of a polybutylene terephthalate and a polyethylene terephthalate, a flame retardant, a flame retardant aid and a heat-resistant fatty acid ester, and an inorganic filler, and having excellent surface gloss and processability. It is to provide a composition.

Further, another object of the present invention is to provide a molded article produced using the polyester resin composition of the present invention.

Polyester resin composition of the present invention for achieving the above object is (A) 33 to 75% by weight of polybutylene terephthalate resin (PBT), (B) 10 to 40 weight of polyethylene terephthalate resin (PET) %, (C) 8 to 15% by weight of bromine-based flame retardant as the main flame retardant, (D) 2 to 10% by weight of antimony secondary flame retardant, and (E) 0.1 to 2% by weight of the heat-resistant fatty acid ester represented by the following formula (1) It is characterized by including 10-60 weight part of (F) inorganic fillers with respect to 100 weight part of resin mixture which consists of.

(In Formula 1, R is a linear aliphatic alkyl group having 8 to 18 carbon atoms)

In the polyester resin composition according to the present invention, the polybutylene terephthalate resin is a polymer of butane-1,4-diol and terephthalic acid or dimethyl terephthalate.

In the polyester resin composition according to the present invention, the polybutylene terephthalate resin is a modified polybutylene terephthalate, butane-1,4-diol and polytetramethylene glycol (PTMG), polyethylene glycol (PEG), or It is characterized by being a copolymer of polypropylene glycol (PPG).

In the polyester resin composition according to the present invention, the polyethylene terephthalate resin is produced by polymerization of a dicarboxylic acid and a diol compound.

In the polyester resin composition according to the present invention, the brominated flame retardant is represented by (C1) brominated polycarbonate oligomer represented by the following formula (2), (C2) brominated epoxy compound represented by the following formula (3), and the following formula (4) (C3) at least one member selected from the group consisting of brominated polyacrylates.

(In Formula 2, X is a bromine atom, i and j are each a positive integer of 1 to 4, n is the average degree of polymerization of 2 to 30, Y and Z are terminal groups,

Y is

또는

,

or

,

Z is

또는

이다)

or

to be)

(In Formula 3, n is an average degree of polymerization of 11 to 50)

(In Formula 4, p is 1 to 5, n is the average degree of polymerization of 10 to 160)

In the polyester resin composition according to the present invention, the antimony-based auxiliary flame retardant is characterized in that the antimony trioxide.

In the polyester resin composition according to the present invention, the inorganic filler is at least one selected from the group consisting of glass fibers, carbon fibers, glass beads, glass flakes, clay, kaolin, talc, mica, calcium carbonate, and barium sulfate. It is done.

Moreover, this invention provides the molded article manufactured using the said polyester resin composition.

Hereinafter, the present invention will be described in more detail.

(A) Polybutylene Terephthalate (PBT) Resin

In the present invention, the polybutylene terephthalate resin (PBT) of component (A) is a polymer polycondensed through direct esterification or transesterification reaction using butane-1,4-diol and terephthalic acid or dimethyl terephthalate as monomers. Melting temperature is 215 ~ 235 ℃, it is possible to use a polymer having an intrinsic viscosity (IV) of 0.75 ~ 1.5dl / g.

Moreover, in this invention, in order to improve the impact resistance of polybutylene terephthalate resin, the modified polybutylene terephthalate resin which modified | denatured the said resin can also be used.

As a manufacturing method of modified polybutylene terephthalate resin, there exist a method of copolymerizing polytetramethylene glycol (PTMG), polyethyleneglycol (PEG), or polypropylene glycol (PPG) at the time of superposition | polymerization.

The content of the polybutylene terephthalate resin is preferably 33 to 75% by weight of the total resin mixture. This is because when the content of the polybutylene terephthalate resin is less than 33% by weight, it is difficult to expect the improvement of the heat resistance according to the addition of the inorganic filler, and when the content of the resin exceeds 75%, the surface gloss is greatly reduced. .

(B) polyethylene terephthalate (PET) resin

In the present invention, the polyethylene terephthalate (PET) resin of component (B) is prepared by polymerization of dicarboxylic acid and diol compound.

Examples of the polycarboxylic acid compound include terephthalic acid, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 4,4'-biphenyl dicarboxylic acid, 4,4'-dibenzyldacarboxylic acid, and the like.

As the dicarboxylic acid compound for producing the polyethylene terephthalate resin of the present invention, terephthalic acid, isophthalic acid or a mixture thereof is preferable.

Examples of the diol component include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 1,2-cyclo Hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, neopentyl glycol, 2,2,4,4-tetramethyl-1,3-cyclo Butanediol and the like.

Ethylene glycol is preferable as the diol component for producing the polyethylene terephthalate resin of the present invention.

The content of the polyethylene terephthalate resin is used in an amount of 10 to 40% by weight of the total resin mixture. When the content of the polyethylene terephthalate resin is less than 10% by weight, the effect of lowering the crystallization rate of the polybutylene terephthalate resin is insignificant, and there is no effect of improving the surface gloss, and the content of the resin exceeds 40% by weight. This is because the speed is delayed, resulting in poor releasability.

(C) main flame retardant

(C1) brominated polycarbonate oligomer

In the present invention, the brominated flame retardant (C1) brominated polycarbonate oligomer, which is the main flame retardant of component (C), is represented by the following formula (2), and a compound having a bromine content of about 20% by weight or more is preferable. This is because a bromine content of less than 20% by weight makes it difficult to obtain a satisfactory flame retardant effect.

[Formula 2]

(In Formula 2, X is a bromine atom, i and j are each a positive integer of 1 to 4, n is the average degree of polymerization of 2 to 30, Y and Z are terminal groups,

Y is

또는

,

or

,

Z is

또는

이다)

or

to be)

The brominated polycarbonate oligomer flame retardant is preferably added to 8 to 15% by weight of the total resin mixture. This is because it is difficult to expect a flame retardant effect when the content of the brominated polycarbonate oligomer flame retardant is less than 8% by weight, and when the content of the flame retardant exceeds 15% by weight, it is easy to decompose or cause a defect of a molded product. .

(C2) brominated epoxy compound

The brominated flame retardant (C2) in the brominated flame retardant as the main flame retardant of component (C) in the present invention is a polytetrabrom bisphenol A epoxy compound represented by the following general formula (3).

[Formula 3]

(In Formula 3, n is an average degree of polymerization of 11 to 50)

The brominated epoxy compound is a tetrabrombisphenol A diglycidyl ether obtained by reacting tetrabrombisphenol A with epichlorohydrin. It can be obtained by mixing to the equivalent, and heating to 100 to 250 ° C in the presence of a basic catalyst, sodium hydroxide, lithium hydroxide, tributylamine and the like.

The average polymerization degree (n) of such a brominated epoxy compound is 11-50. This means that when the average degree of polymerization of the brominated epoxy compound is less than 11, the epoxy equivalent of the brominated epoxy compound increases, making it difficult to suppress a decrease in moldability due to reaction with the polyester, and when the average degree of polymerization of the compound exceeds 50. This is because the fluidity of polyester falls.

(C3) brominated polyacrylate

The brominated flame retardant (C3) in the brominated flame retardant which is the main flame retardant of component (C) in the present invention is represented by the following general formula (4) and is a polymer of brominated benzyl acrylate or brominated benzyl methacrylate.

[Formula 4]

(In Formula 4, p is 1 to 5, n is the average degree of polymerization of 10 to 160)

Specific examples of such brominated polyacrylates include polypentabrombenzyl acrylate, polytetrabrombenzyl acrylate, polytribrombenzyl acrylate, polypentabrombenzyl methacrylate, and the like. As the acrylate, polypentabrombenzyl acrylate is preferable.

Such brominated polyacrylate may be copolymerized with a small amount of other vinyl monomers, and their copolymerization ratio is preferably 10 mol% or less.

The average degree of polymerization (n) of the brominated polyacrylate is 20 to 160. This is because when the average degree of polymerization of the brominated polyacrylate is less than 20, the heat resistance of the polyester is lowered, and when the average degree of polymerization is more than 160, the fluidity of the polyester is lowered.

The main flame retardant may be one or more flame retardants selected from the group consisting of (C1) brominated polycarbonate oligomers, (C2) brominated epoxy compounds, and (C3) brominated polyacrylates.

(D) antimony secondary flame retardant

In the present invention, the antimony secondary flame retardant of component (D) is a flame retardant aid, the content of which is 2 to 10% by weight of the total resin mixture, and antimony trioxide is preferred. When the content of the antimony-based auxiliary flame retardant is less than 2% by weight, the effect as an auxiliary flame retardant is not sufficiently exhibited. When the content of the antimony-based auxiliary flame retardant is more than 10% by weight, the mechanical properties of the resin composition are deteriorated.

The antimony trioxide may have a purity of 98% or more, a particle diameter of 0.1 to 5 μm, more preferably a particle diameter of 0.5 to 3 μm.

(E) Heat resistant fatty acid ester

In the present invention, the heat-resistant fatty acid ester of component (E) is used to impart high fluidity and surface properties to the polyester resin composition.

The heat-resistant fatty acid ester improves the compatibility between the polybutylene terephthalate and polyethylene terephthalate components, uniformly disperses the main flame retardant, flame retardant aids and inorganic fillers to be described below, greatly improves the fluidity of the inorganic fillers It serves to suppress surface protruding.

Heat-resistant fatty acid esters suitable for the present invention are fatty acid esters derived from bisphenol A, represented by the following general formula (1).

[Formula 1]

(In Formula 1, R is a linear aliphatic alkyl group having 8 to 18 carbon atoms)

The heat-resistant fatty acid ester is preferably added in 0.1 to 2% by weight of the total resin mixture. This is because if the content of the heat-resistant fatty acid ester is less than 0.1% by weight, there is little effect on improving the fluidity, and when the content is more than 2% by weight, mechanical properties are lowered and gas is easily generated during molding.

(F) inorganic filler

In the present invention, the inorganic filler of component (F) is used for improvement of heat resistance and dimensional stability, and such inorganic filler is representative of glass fiber, and glass fiber of chopped strand of ordinary short fiber length. May be used, and a coupling agent may be used to increase adhesion with the resin.

Other inorganic fillers that can be used are at least one selected from the group consisting of carbon fiber, glass beads, glass flakes, clay, kaolin, talc, mica, calcium carbonate, and barium sulfate.

The inorganic filler is 10 to 60 parts by weight based on 100 parts by weight of the total resin mixture. This is because if the content of the inorganic filler is less than 10 parts by weight, the effect on the heat resistance and mechanical properties improvement due to the addition of the inorganic filler is insignificant, and if it exceeds 60 parts by weight, the surface gloss is greatly reduced.

On the other hand, the resin composition of the present invention may further include an additive for various purposes, the kind and content thereof is according to those skilled in the art. For example, reinforcing and nucleating agents to improve mechanical properties, lubricants and anti-separation agents to improve surface properties, flame retardants to improve chemical properties, dyes to improve aesthetic properties, deodorants and deodorants, to improve processing properties It may further include a fluidizing agent, a release agent and the like.

That is, the resin composition of the present invention is a lubricant, antioxidant, light stabilizer, hydrolysis stabilizer, release agent, pigment, dye, antistatic agent, conductivity giving agent, magnetic imparting agent, crosslinking agent, antibacterial agent, processing aid, anti-friction agent, reinforcing agent, It may further include one or more additives selected from the group consisting of nucleating agents, anti-separation agents, deodorants, deodorants, fluidizing agents, mold release agents, antiwear agents and coupling agents.

The method for producing the resin composition of the present invention by kneading and extruding with a twin screw melt kneading extruder at a temperature of 240 ~ 280 ℃ by a commonly used blending method to produce a pellet for molding, the pellet at 100 ~ 120 ℃ 4 hours After hot-air drying, it is manufactured by molding with an injection molding machine.

As described above, the resin composition and the molded article using the same according to the present invention have excellent fluidity and surface gloss, and can be suitably used for parts such as connectors, sockets, and fuse cases for automobiles and electrical and electronic applications. It can also be used as a microswitch housing.

Hereinafter, the present invention will be described in more detail by describing preferred embodiments of the present invention, and comparative examples and experimental examples for comparison thereto. However, the present invention is not limited to the following Examples and Experimental Examples, and various forms of embodiments can be implemented within the scope of the appended claims, and only the following examples are provided in the art to complete the present disclosure. It is intended to facilitate the practice of the invention to those skilled in the art.

[Examples 1 to 6 and Comparative Examples 1 to 3]

The raw materials were well mixed with a Henschel mixer with the composition components and contents shown in Table 1 (Examples 1 to 6) and Table 2 (Comparative Examples 1 to 3), and then uniformly dispersed, and then L / D = 40, f = Extruded at a temperature of 240 ~ 280 ℃ by a twin screw melt kneading extruder of 25mm in the form of pellets, hot air dried at 100 ~ 120 ℃ for 4 hours, and injection molded at a temperature of 240 ~ 280 ℃ to mold the specimen Example 1 To 6 and Comparative Examples 1 to 3 to prepare a resin composition. Glass fibers were side fed through the midpoint of the extruder.

Composition ingredient (content) Example One 2 3 4 5 6 PBT (% by weight) 67 67 67 67.7 45 65 PET (% by weight) 17 17 17 17 39 14 Brominated Polycarbonate Oligomer (C1) (% by weight) 10 4 - 10 10 - Brominated Epoxy Oligomer (C2) (wt%) - - 10 - - - Brominated Polyacrylate (C3) (wt%) - 6 - - - 13 Antimony Trioxide (wt%) 5 5 5 5 5 7 Heat-resistant fatty acid ester (% by weight) One One One 0.3 One One Fiberglass (parts by weight) 40 40 40 40 40 20

Composition ingredient (content) Comparative example One 2 3 PBT (% by weight) 67 84 35 PET (% by weight) 18 - 50 Brominated Polycarbonate Oligomer (C1) (% by weight) 10 10 - Brominated Epoxy Oligomer (C2) (wt%) - - 10 Brominated Polyacrylate (C3) (wt%) - - - Antimony Trioxide (wt%) 5 5 5 Heat-resistant fatty acid ester (% by weight) - One - Fiberglass (parts by weight) 40 40 40

The material used in the present Example and the comparative example was as follows.

(A) Polybutylene terephthalate resin (PBT): Polymerized using butane-1,4-diol and dimethyl terephthalate, intrinsic viscosity 1.2 dl / g (25 DEG C, phenol / tetrachloroethane 50/50 In solution).

(B) Polyethylene terephthalate resin (PET): It was polymerized with terephthalic acid and ethylene glycol, and had an intrinsic viscosity of 0.80 dl / g (at 25 ° C. in a phenol / tetrachloroethane 50/50 solution).

(C) Lead flame retardant:

(C1) Brominated polycarbonate oligomer: BC-58 from Great Lakes, (C2) Brominated epoxy compound: F2300H from Dead Bromine Group (DSBG), (C3) Brominated polyacrylate: Dead Sea Bromine group FR1025 from (DSBG).

(D) Antimony secondary flame retardant: ANTIW-W of Ilsung Antimony Co., Ltd. as antimony trioxide.

(E) Heat resistant fatty acid ester: MKP-407A from Takemoto Oil & Fat.

(F) Inorganic filler: NITTOBO's 183F

Experimental Example 1

The physical properties of each specimen prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were measured by the following method, and the results are shown in Table 3 below.

(1) Tensile strength and tensile elongation: It evaluated based on ASTMD638.

(2) Heat deflection temperature (HDT): evaluated under a load of 18.6kgf / cm ² in accordance with ASTM D648.

(3) Impact strength: It was evaluated according to ASTM D256 (1/8 inch thickness, Notched Izod).

(4) Flame retardancy: Based on the UL94 test method, it was evaluated at a thickness of 1.6mm.

(5) Flowability (flow length): In order to measure the flow length with a test piece having a width of 1 cm and a thickness of 1 mm, it was molded in an injection molding machine under the following conditions and the flow rate of the composition was evaluated. Cylinder temperature: 260 ℃, Injection pressure: 750kg / cm ² , Mold temperature: 60 ℃

(6) Surface glossiness (Gloss): Glossiness was measured by a gloss meter (60 degrees) according to ASTM D523.

(7) Appearance: A 3 mm thick specimen was injection molded, and it was visually determined whether the glass fiber protruded from the surface.

(8) Mold release: Mold release was determined during continuous injection molding.

Properties Example Comparative example One 2 3 4 5 6 One 2 3 Tensile Strength (kgf / cm ² ) 1,320 1,300 1,330 1,320 1,330 1,320 1,330 1,280 1,320 Tensile Elongation (%) 2.3 2.5 2.5 2.4 2.7 2.4 2.5 2.7 2.4 Impact Strength (1/8 ", kgf cm / cm) 8.6 8.8 9.1 8.4 9.3 8.2 8.4 8.2 8.2 Heat Deflection Temperature (℃) 203 202 203 202 205 196 202 200 206 Flame Retardant (UL94, 1.6mm) V-0 V-0 V-0 V-0 V-0 V-0 V-0 V-0 V-0 Fluidity (flow length) (cm) 16 20 12 12 18 24 8 7 6 Surface glossiness (%) 87 90 88 86 87 88 64 58 83 Exterior Good Good Good Good Good Good Bad Bad Good Dysplasia Good Good Good Good Good Good Good Good Bad

As shown in Table 3, the polyester composition of Examples 1 to 6 according to the present invention, Comparative Example 2, which does not contain a heat-resistant fatty acid ester, or Comparative Example 2 using polybutylene terephthalate (PBT) alone It can be seen that the surface gloss and fluidity are excellent while maintaining physical properties such as tensile strength, impact strength, heat deformation temperature, and the like. In addition, in Example 4, even if a small amount of the heat-resistant fatty acid ester can be seen that the effect is sufficiently exhibited.

On the other hand, Comparative Example 3 having a polyethylphene terephthalate (PET) content of 50% by weight has a good surface gloss, but the content of polyethylene terephthalate is too high, poor releasability, it was difficult to continuous injection molding.

As described above, the polyester resin composition according to the present invention includes a mixed resin of polybutylene terephthalate and polyethylene terephthalate, a flame retardant imparting flame retardancy and a flame retardant aid, while being heat-resistant fatty acid that can improve processability By including an ester and an inorganic filler that provides strength, heat resistance and dimensional stability, the mechanical strength and heat resistance as well as surface gloss and processability are simultaneously improved, making it suitable for use in automobile and electrical / electronic parts cases. It can also be used as a microswitch housing for microwave ovens, TVs and the like.

Claims (8)

(A) 33-75 weight% of polybutylene terephthalate resins (PBT), (B) 10-40 weight% of polyethylene terephthalate resins (PET), (C) 8-15 weight% of brominated flame retardants as a main flame retardant, ( D) 2 to 10% by weight of the antimony auxiliary flame retardant, and (E) 10 to 60% by weight of (F) an inorganic filler, based on 100 parts by weight of the resin mixture composed of 0.1 to 2% by weight of the heat-resistant fatty acid ester represented by the following general formula (1): A polyester resin composition comprising a part. [Formula 1]

(In Formula 1, R is a linear aliphatic alkyl group having 8 to 18 carbon atoms) The polyester resin composition according to claim 1, wherein the polybutylene terephthalate resin is a polymer of butane-1,4-diol and terephthalic acid or dimethyl terephthalate. The method of claim 1, wherein the polybutylene terephthalate resin is a modified polybutylene terephthalate, butane-1,4-diol and polytetramethylene glycol (PTMG), polyethylene glycol (PEG), or polypropylene glycol (PPG A polyester resin composition, characterized in that the copolymer. The polyester resin composition of claim 1, wherein the polyethylene terephthalate resin is prepared by polymerization of a dicarboxylic acid and a diol compound. The brominated flame retardant according to claim 1, wherein the brominated flame retardant is (C1) brominated polycarbonate oligomer represented by the following formula (2), (C2) brominated epoxy compound represented by the following formula (3), and (C3) brominated poly represented by the following formula (4) Polyester resin composition, characterized in that at least one selected from the group consisting of acrylates. [Formula 2]

(In Formula 2, X is a bromine atom, i and j are each a positive integer of 1 to 4, n is the average degree of polymerization of 2 to 30, Y and Z are terminal groups, Y is

or

, Z is

or

to be) [Formula 3]

(In Formula 3, n is an average degree of polymerization of 11 to 50) [Formula 4]

(In Formula 4, p is 1 to 5, n is the average degree of polymerization of 10 to 160) The polyester resin composition according to claim 1, wherein the antimony-based auxiliary flame retardant is antimony trioxide. The method of claim 1, wherein the inorganic filler is a polyester resin, characterized in that at least one selected from the group consisting of glass fibers, carbon fibers, glass beads, glass flakes, clay, kaolin, talc, mica, calcium carbonate, and barium sulfate. Composition. A molded article manufactured using the polyester resin composition according to claim 1.