KR20160038728A

KR20160038728A - Thermoplastic resin composition and molded article using the same

Info

Publication number: KR20160038728A
Application number: KR1020150118246A
Authority: KR
Inventors: 박찬무; 강태곤; 정유진; 임종철; 홍상현
Original assignee: 삼성에스디아이 주식회사
Priority date: 2014-09-30
Filing date: 2015-08-21
Publication date: 2016-04-07
Also published as: TW201612237A; TWI631175B; KR101786192B1

Abstract

One embodiment of the present invention is a colorant composition comprising (A) a polyester resin, (B) an inorganic filler, and (C) a white pigment, wherein at least any one of the inorganic filler (B) and the white pigment (A), (B) and (C) is 0.3 to 5% by weight based on the total weight of the thermoplastic resin composition.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition and a molded article using the thermoplastic resin composition.

The present invention relates to a thermoplastic resin composition and a molded article using the same.

BACKGROUND ART Optical semiconductor devices are devices that convert electric energy into light energy. Typical examples are light emitting diode (LED) devices. The light emitting diode (LED) device can realize various wavelength ranges according to the light emitting material to be used and includes organic LED, inorganic LED, quantum dot LED and the like. This kind of light emitting diode (LED) device has high light conversion efficiency, low energy consumption, semi-permanent life span, and environment-friendly, and is being applied as a light source of a lighting apparatus.

Meanwhile, a lighting device using a light emitting diode (LED) device as a light source includes a light source including a device, a package, a panel, a module, and the like; And an accessory including a reflector, a housing, a light guide plate, a light diffusion plate, and the like. At this time, materials used for these accessories are required to have heat resistance, high reflectance and discoloration resistance.

In recent years, polyester resins having excellent resistance to deformation and discoloration at high temperatures have been used as materials for these accessories. Accordingly, there is an increasing demand for development of a technique for improving the mechanical strength, heat resistance, moldability, and reflectance of a polyester thermoplastic resin used as an accessory material for a light emitting diode illuminator.

A related prior art is Korean Patent Publication No. 2013-0076733.

The present invention can provide a thermoplastic resin composition capable of realizing excellent whiteness, high reflectance, excellent reflectance retention, light stability, heat resistance and discoloration resistance and a molded article using the same.

One embodiment of the present invention is a colorant composition comprising (A) a polyester resin, (B) an inorganic filler, and (C) a white pigment, wherein at least any one of the inorganic filler (B) and the white pigment (A), (B) and (C) is 0.3 to 2% by weight based on the total weight of the thermoplastic resin composition.

Another embodiment of the present invention relates to a molded article produced using the above-mentioned thermoplastic resin composition.

The molded article may be an accessory of a lighting apparatus including an LED element as a light source, and the accessory may include a reflector and a housing.

The present invention relates to a thermoplastic resin composition capable of securing a high reflectance and excellent whiteness and maintaining the high reflectance for a predetermined time to realize excellent light stability, constant temperature and humidity reliability, heat resistance and discoloration resistance, and a molded article produced using the same .

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of an LED illumination with a molded article according to one embodiment of the present invention.

Hereinafter, the thermoplastic resin composition of the present invention will be described in detail. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. In addition, unless otherwise defined in the technical terms and scientific terms used, those having ordinary skill in the art to which the present invention belongs have the same meaning as commonly understood. In the following description, well-known functions and constructions that may unnecessarily obscure the essentials of the present invention will not be described.

One embodiment of the present invention is a colorant composition comprising (A) a polyester resin, (B) an inorganic filler, and (C) a white pigment, wherein at least any one of the inorganic filler (B) and the white pigment (A), (B) and (C) is 0.3 to 2% by weight based on the total weight of the thermoplastic resin composition. Accordingly, by using the inorganic filler surface-treated with a silicone compound or the white pigment treated with a silicone-based surface, the thermoplastic resin of the present invention can improve the interfacial characteristics and miscibility with the matrix resin to realize excellent reflectance and reflectance retention characteristics But also excellent discoloration resistance, whiteness, heat resistance, light stability and constant temperature and humidity reliability can be realized.

Hereinafter, each component will be described in more detail.

(A) a polyester resin

The polyester resin in the thermoplastic resin composition can be used to improve the heat resistance, mechanical properties and impact resistance of a molded article at a high temperature.

Specifically, the polyester-based resin may be a polyester-based compound containing an aromatic ring in the structure of the repeating unit. In this case, the heat resistance and discoloration resistance of the molded article can be excellent. Such a polyester resin may be produced, for example, by condensation polymerization of a dicarboxylic acid component containing an aromatic dicarboxylic acid and a derivative thereof and a diol component having 2 to 20 carbon atoms.

The aromatic dicarboxylic acid component may be, for example, terephthalic acid, isophthalic acid, phthalic acid, and naphthalene dicarboxylic acid. The dicarboxylic acid component may be used singly or in combination of two or more. In one embodiment, terephthalic acid may be used as the dicarboxylic acid component. In this case, the stability of the polyester-based resin is excellent, and the discoloration resistance of the molded product using the polyester-based resin can be further improved.

The diol component is not limited, but includes, for example, alicyclic diols; Or mixtures of alicyclic and non-cyclic diols; Etc. may be used. In this case, the polyester resin may contain an alicyclic structure together with an aromatic ring derived from the dicarboxylic acid component in the structure of the repeating unit. As a result, the polyester-based resin has a low melting temperature, and the moldability of the molded article can be improved.

The alicyclic diol is, for example, 1,4-cyclohexanedimethanol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, cis-1,4-cyclohexanedimethanol, cis- , 2-cyclohexanedimethanol and cis-1,3-cyclohexanedimethanol, and the like can be used. The alicyclic diol component may be used alone or in combination of two or more. In one embodiment, the alicyclic diol component may be 1,4-cyclohexane dimethanol (CHDM). In this case, the moldability and the optical stability of the molded article using the polyester-based resin can be further improved.

The bicyclic diol may be an aliphatic diol not containing an alicyclic ring. The aliphatic diols include, for example, ethylene glycol, butylene glycol, propanol glycol and the like. The aliphatic diol component may be used alone or in combination of two or more. In one embodiment, the aliphatic diol component may use ethylene glycol. In this case, the molded article using the polyester-based resin is excellent in heat resistance and at the same time, the impact resistance can be further improved.

The diol component may comprise from 15% to 100% by weight of an alicyclic diol and from 0% to 85% by weight of an aliphatic diol. In one embodiment, the diol component may be a mixture of 30% to 80% by weight of 1,4-cyclohexane dimethanol and 20% to 70% by weight of ethylene glycol. In this case, the diol component can further improve the heat resistance and impact resistance of the polyester-based resin.

The polyester resin may further include at least one kind of aromatic diol having at least one C ₆ to C ₂₁ or aliphatic diol having C ₃ to C ₈ to modify the polyester resin. In one embodiment, C ₆ to C ₂₁ aromatic diols or C ₃ to C ₈ aliphatic diols may be used in copolymerized state with the polyester-based resin. The content thereof may be 3 mol% or less based on 100 mol% of the total diol component described above. Examples of the C ₆ to C ₂₁ aromatic diols or C ₃ to C ₈ aliphatic diols include propane-1,3-diol, butane-1,4-diol, pentane-1,5-diol, Diol, 3-methylpentane-2,4-diol, 2-methylpentane-1,4-diol, 2,2,4-trimethylpentane-1,3-diol, 2-ethylhexane- , 2,2-bis (3-hydroxyethoxyphenyl) -propane, 2,2-bis- (4 -Hydroxypropoxyphenyl) -propane and the like.

The method for producing the polyester-based resin is not particularly limited and can be produced by a known conventional polycondensation reaction. The polycondensation reaction may be, for example, a direct condensation method of an acid by an ester exchange reaction using a glycol or a lower alkyl ester.

More specifically, the polyester-based resin may be at least one selected from the group consisting of polyethylene terephthalate resin, polytrimethylene terephthalate resin, polybutylene terephthalate resin, polyhexamethylene terephthalate resin, polycyclohexanedimethylene terephthalate resin, Based polyester resin. These polyester resins may be used singly or in combination of two or more kinds.

For example, the polyester-based resin may be a polycyclohexanedimethylene terephthalate (PCT) resin including a unit represented by the following formula (1).

[Chemical Formula 1]

In Formula 1, m is an integer selected from 10 to 500.

In this case, the polyester resin can realize a high reflectance, a reflectance holding property (light stability), a constant temperature and humidity reliability, and a synergistic effect of discoloration resistance on a molded article using the same. The unit represented by the above formula (1) may be, for example, a resin produced by condensation polymerization of terephthalic acid and 1,4-cyclohexanedimethanol.

The polyester resin may have a melting point of 200 ° C or higher, 200 ° C to 380 ° C, specifically 220 ° C to 380 ° C, more specifically 260 ° C to 320 ° C or 200 ° C to 300 ° C.

The polyester resin has an intrinsic viscosity [η] (measured by using a mixed solvent of tetrachloroethane: phenol weight ratio = 1: 1 and using a viscosity tube at 35 ° C) in an o-chlorophenol solution at 25 ° C And may be from 0.4 dl / g to 1.5 dl / g, and specifically from 0.5 dl / g to 1.2 dl / g. Within the above range, the molding processability and mechanical properties of the molded article can be improved.

The weight average molecular weight of the polyester resin may range, for example, from 3,000 g / mol to 30,000 g / mol, more specifically from 5,000 g / mol to 20,000 g / mol. Within the above range, the molding processability and mechanical properties of the molded article can be improved.

In the present specification, the weight average molecular weight is measured by dissolving a powder sample in tetrahydrofuran (THF) and then measuring it using Gel Permeation Chromatography (GPC; lient Technologies 1200 series) (column: Shodex LF-804 8.0.1.D. × 300 mm), and a standard sample was polystyrene (Shodex).

The content of the polyester-based resin may be 50% by weight to 80% by weight of the total weight of the thermoplastic resin composition. For example, the content of the polyester resin may be 60% by weight to 70% by weight. Within the above range, the molded article is excellent in heat resistance and mechanical properties, and has excellent molding processability and optical stability.

(B) inorganic filler

The inorganic filler in the thermoplastic composition can improve the strength in combination with other components in the composition, impart a high reflectance to the molded article, and realize excellent light stability and discoloration resistance.

As such an inorganic filler, for example, at least one of carbon-based filler, glass filler, metal filler, metalloid filler, clay, kaolin, talc, mica and wollastonite can be used.

The carbon-based filler may include carbon fiber, graphite, carbon black, and the like.

The glass filler may include glass fibers, glass beads, glass flakes, and the like.

The metal-based filler may include potassium titanate whisker, aluminum borate whisker, calcium whisker and the like.

The metalloid filler may include boron fiber or the like.

In one embodiment, the inorganic filler may be glass fiber. The glass fiber may have a shape of a cross section, specifically a circular shape, an elliptical shape, or a dumbbell shape in which two circular shapes are connected to each other. The glass fiber having a circular shape in cross section may have a section diameter of 5 to 20 탆 and a length of 2 to 5 mm before processing. The glass fiber having an elliptical shape in the cross section may have an aspect ratio of 1.5 to 10 and a length before machining of 2 to 5 mm. In this case, the processability of the thermoplastic resin composition is improved, and the mechanical properties such as tensile strength and impact resistance of the molded article can be further improved.

The inorganic filler may be a surface-treated silicone compound. As a result, the binding force with other components in the composition can be increased and a synergistic effect of physical properties can be realized.

The silicon-based compound may include one or more compounds represented by any one of the following Chemical Formulas (2) to (3).

(2)

R ¹ _x Si (R ² ) _4-x

Wherein R ¹ is an alkoxy group having 1 to 5 carbon atoms and R ² is independently an acrylate group, a methacrylate group, a vinyl group, an alkylamino group, a cyanate group, an isocyanate group, an epoxy group, , A thiol group, a ureido group, a glycidyloxyalkyl group having 1 to 10 carbon atoms, an epoxycycloalkyl group or a carboxyl group having 1 to 10 carbon atoms, and x is an integer of 1 to 3.

The silicon-based compound represented by Formula 2 may be, for example,? - (3,4-epoxycyclohexyl) ethyltrimethoxysilane,? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethylethoxy Silane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane,? -Isocyanatopropyltrimethoxysilane, vinyltriethoxysilane, and 2-aminopropyltriethoxysilane. The silicone compound represented by the general formula (2) may be used singly or in combination of two or more kinds. The organosilane compound represented by Formula 2 may be coated with an inorganic filler and cured by heat, catalyst, or light to form a coating film. The organic silane compound is not particularly limited as long as the inorganic filler can be coated with a silicone compound.

(3)

R ³ _n (SiO _{(4-n) / 2} ) _m

In Formula 3, R ³ is each independently selected from the group consisting of hydrogen, an unsubstituted alkyl group, a vinyl substituted alkyl group, an aryl substituted alkyl group, an alkyl substituted alkoxy group, an alkoxy substituted alkylaryldiiyl group, N is 2 to 3, and m is an integer of 2 to 200. [

The silicon-based compound represented by Formula 3 may be polydimethylsiloxane, vinylphenylmethyl-terminated dimethylsiloxane, divinylmethyl-terminated polydimethylsiloxane, and the like, but is not limited thereto. The silicone compound represented by the general formula (3) may be used singly or in combination of two or more kinds. The silicone compound represented by Formula 3 is not particularly limited as long as the silicone compound can coat the inorganic filler.

When the thermoplastic resin composition contains an inorganic filler surface-treated with a silicone compound, the content of silicon is 0.2 wt% to 17 wt%, specifically 0.3 wt% to 10 wt% based on the inorganic filler, more specifically, 0.4% to 1.0% by weight. The content of silicon is measured using a conventional element analyzer, and in the present specification, the content of silicon has the above meaning.

When the total weight of the thermoplastic resin composition is based on the total weight of the thermoplastic resin composition, the content of silicon may be 0.3 wt% to 2 wt%, for example, 0.4 wt% to 1.0 wt%. When the above-mentioned range is satisfied, the desired effect of the present invention can be achieved.

The content of the inorganic filler may be 5 wt% to 30 wt% with respect to the total weight of the composition. More specifically from 10% to 25% by weight. Within the above range, the molded article is excellent in the mechanical property and color discoloration synergistic effect, is excellent in flowability and moldability, and can be improved in light stability and optical efficiency.

(C) a white pigment

The white pigment in the thermoplastic resin composition is included for the purpose of improving high reflectance and discoloration resistance. The white pigment is not limited as long as it is a white pigment well known in the art. For example, the white pigment may be at least one of titanium oxide, zinc oxide, zinc sulfide, zinc white, zinc sulfate, barium sulfate, calcium carbonate, alumina and mixtures thereof. In one embodiment, the white pigment may be titanium oxide. The crystal structure of the titanium oxide is not particularly limited, and rutile type or anatase type is stable when exposed to high temperature for a long period of time, and the decrease in reflectance can be effectively prevented.

In the present invention, the white pigment may be a surface-treated silicone compound. Thus, in combination with other components in the composition, mechanical properties such as strength and the like, as well as physical properties such as light stability and discoloration resistance can be realized.

When a white pigment surface-treated with the silicone compound is used, the inorganic filler in the composition may be surface-treated with a silicone compound or not surface-treated.

Specifically, at least one of the components of the white pigment and the inorganic filler in the thermoplastic resin composition is surface-treated with a silicone compound, which is advantageous in realizing a synergistic effect of physical properties.

In one embodiment, the thermoplastic resin composition of the present invention may have a silicon content of 0.3 wt% to 2 wt%, for example, 0.4 wt% to 1.0 wt% based on the total weight. When the above-mentioned range is satisfied, the desired effect of the present invention can be achieved.

In another embodiment, the thermoplastic resin composition of the present invention has a silicon content of 0.3 wt% to 2 wt%, for example, 0.4 wt% or more, based on the total weight of (A), (B) 1.0% by weight. When the above-mentioned range is satisfied, the desired effect of the present invention can be achieved.

The content of silicon may be in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the white pigment based on the white pigment.

The silicone compound, which is a surface treatment agent for the white pigment, is the same as the surface treatment of the inorganic filler, and thus a duplicated description thereof will be omitted.

The particle size of the white pigment may be 0.01 탆 to 2.0 탆, specifically 0.05 탆 to 0.7 탆.

The white pigment may include 5% by weight to 30% by weight of the total weight of the resin composition. More specifically from 10% by weight to 25% by weight. Within the above range, the molded article is excellent in the reflectance and reflectance maintaining effect, and the impact resistance and the mechanical strength can be further improved.

(D) Additive

The present invention may further include conventional additives depending on the application within a range not to impair the desired effect. Examples of the additives include antimicrobial agents, heat stabilizers, antioxidants, mold release agents, light stabilizers, surfactants, coupling agents, plasticizers, compatibilizers, lubricants, antistatic agents, flame retardants, flame retardant aids, antifoulants, endurance agents, ultraviolet absorbers, And one or more additives in the mixture.

Examples of the antioxidant include phenols, amines, sulfur, and the like. Examples of the heat stabilizer include a lactone compound, a hydroquinone, a copper halide, and an iodine compound. Examples of the flame retardant include bromine, chlorine, phosphorus, and antimony.

The additive may be appropriately contained within a range that does not impair the physical properties of the polyester resin composition, and specifically may be included in an amount of 20 parts by weight or less based on 100 parts by weight of the total composition, more specifically 0.1 part by weight To 15 parts by weight.

The thermoplastic resin composition of the present invention can be produced by a known method. For example, each component and additive are mixed with a Henschel mixer, a V blender, a tumbler blender, a ribbon blender, etc., and melt-extruded at a temperature of 150 ° C to 350 ° C using a single screw extruder or a twin screw extruder to produce a pellet can do. More specifically, extrusion molding was carried out at a temperature of 250 ° C. to 310 ° C. using a twin-screw extruder having L / D = 29 and φ = 36 mm at a screw rotation speed of 300 rpm to 600 rpm and a self-feed rate of 60 kg / hr to 600 kg / To form pellets. The prepared pellets were dried at 80 ° C. for 4 hours or more and injected into the specimen.

Another embodiment of the present invention can provide a molded article capable of improving the reflectance characteristics, particularly the reflectance holding property at high temperature, by molding the above-mentioned thermoplastic resin composition and realizing discoloration resistance. Using the above-described thermoplastic resin composition, a molded article can be produced by various processes such as injection molding, double injection molding, blow molding, extrusion molding, and thermoforming.

The molded product may have a reflectance difference of less than 8% expressed by the following formula (1).

Reflectance difference (%) = | (F1 - F0) |

In the above formula (1), F0 is the initial reflectance of the molded article, and F1 is the reflectance measured after irradiating the molded article with light at a wavelength of 450 nm for 480 hours in a constant temperature and humidity oven under the conditions of 170 deg.

The molded product may have a difference in yellowness represented by the following formula (2) to be 4.5 or less.

Yellowness difference (%) = | (YI1 - YI0) |

In the formula (2), YI0 is an initial yellowness degree of the molded article, and YI1 is a yellowness degree measured after leaving the molded article at 170 DEG C for 480 hours.

The molded article produced from the thermoplastic resin composition of the present invention has high reflectance, excellent reflectance holding property, and discoloration resistance, and specifically, can be used as an accessory of a lighting apparatus including an LED element as a light source. More specifically, the accessory may include a reflector or a housing. 1 is a cross-sectional view of a lighting device (hereinafter LED lighting) including an exemplary LED device of the present invention. Referring to this, the LED lighting comprises an LED package 2 including an LED photoelectric element 6 and a lead 5 connected to the electrode surface of the photoelectric element, a substrate 3 on which the LED package is fixed, And a reflector 1 which is formed of a thermoplastic resin and surrounds the light source of the photoelectric device.

The above-mentioned thermoplastic resin composition can be applied to the reflector 1 of LED lighting. In this case, the reflector 1 is excellent in whiteness, reflectance, reflectance retention characteristics, constant temperature and humidity reliability, and heat resistance, so that the light utilization factor of the LED illumination can be increased and the durability can be improved.

The molded article made of the thermoplastic resin composition is not limited as long as it is used for reflecting other light. For example, it can be used as a reflector for light emitting devices such as various electrical and electronic parts, indoor and outdoor lighting, automobile lighting, and display devices.

Example

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples.

The specifications of each component used in the following examples and comparative examples are as follows.

(A) a polyester resin

PCT Polyester PURATAN (TM) 0302 (melting temperature 290) manufactured by SK chemical was used.

(B1) Inorganic filler 1

A glass fiber of KCC made by surface treatment with siloxane and vinylsilane compound was used.

(B2) Inorganic filler 2

CS-A glass fiber of KCC surface-treated with a siloxane-based compound was used.

(B3) Inorganic filler 3

CS-B glass fibers of KCC, which had been surface-treated with siloxane and aminosilane compounds, were used.

(B4) Inorganic filler 4

910 glass fiber of Owens Corning Inc., surface-treated with an epoxy compound, was used.

(C1) White pigment 1

Titanium oxide (TiO ₂ ) 2233 of KRONOS (USA) surface-treated with a silicon compound was used.

(C2) White pigment 2

Titanium oxide (TiO ₂ ) R105 of Dupont (USA), which was surface-treated with a silicon compound, was used.

Example 1

The thermoplastic resin composition was prepared by dry blending the polyester resin, glass fiber and white pigment as shown in the following Table 1, and then, using a twin screw extruder having a diameter of? = 450 mm, Lt; RTI ID = 0.0 > 350 C < / RTI > The dried pellets were dried at 100 ° C. for 4 hours or more, and then plate-like specimens were injected, and the properties of the pellets were evaluated. The results are shown in Table 1.

Example 2

The procedure of Example 1 was repeated except that inorganic filler 1 (B1) was used in Example 1 and inorganic filler 2 (B2) was used.

Example 3

The procedure of Example 1 was repeated except that inorganic filler 3 (B3) was replaced with inorganic filler 2 (B2) in Example 1.

Example 4

The procedure of Example 1 was repeated except that the white pigment 1 (C1) was replaced with the white pigment 2 (C2) in Example 1.

Comparative Example 1

The procedure of Example 1 was repeated except that inorganic filler 1 (B1) was used in Example 1, and inorganic filler 4 (B4) was used.

&Lt; Method for measuring physical properties &

(1) Reflectance

The plate-like specimens prepared in Examples and Comparative Examples were measured for reflectance at a wavelength of 450 nm. As a reflectance meter, 3600 CIE Lab. Of KONICA MINOLTA HOLDINGS, INC. Was used.

The initial reflectance (SCI, specular component included) was measured and the reflectance after 140 hours, 220 hours and 480 hours of irradiation in a constant temperature and humidity oven at 170 ° C and 85% relative humidity was measured to evaluate the decrease in reflectance.

Further, the reflectance difference value was calculated based on the above measured values according to the following formula (1).

Reflectance difference (%) = | (F1 - F0) |

(2) Yellow index (YI)

Minolta 3600D according to ASTM D1925 CIE Lab. Using a colorimeter, the yellowness of 2.5 mm thick specimens was measured. The initial degree of yellowness was measured and the LED light source having a wavelength of 460 nm was allowed to stand for 140 hours, 220 hours and 480 hours in a constant temperature and humidity oven at 170 캜 and 85% relative humidity, and then the degree of yellowness was evaluated by measuring yellowness.

Further, the yellow difference value was calculated based on the above measured value according to the following formula (2).

Yellowness difference (%) = | (YI1 - YI0) |

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 (A) Polyester 60 60 60 60 60 (B1) Inorganic filler 1 20 - - 20 - (B2) Inorganic filler 2 - 20 - - - (B3) Inorganic filler 3 - - 20 - - (B4) Inorganic filler 4 - - - - 20 (C1) White pigment 1 20 20 20 - 20 (C2) White pigment 2 - - - 20 - The Si content in the total resin composition 0.48 0.48 0.50 0.70 0.20 The reflectance evaluation result (450 nm) Early 100 100 100 100 100 140hr 98.1 97.3 97.4 97.9 96.6 220hr 97.4 96.7 96.8 97.3 95.7 480 hr 93.6 93.5 93.3 93.4 92.2 | (F1 - F0) | 6.4 6.5 6.7 6.6 7.8 Yellowness evaluation results of the specimen (170 ° C) Early 4.1 3.9 4.0 4.0 4.0 140hr 6.0 5.7 5.9 5.8 6.3 220hr 6.4 6.2 6.3 6.3 6.9 480 hr 8.6 8.3 8.6 8.4 9.2 | (YI1 - YI0) | 4.5 4.4 4.6 4.4 5.2

As can be seen from the above Table 1, Examples 1 to 4 according to the present invention have significantly improved reflectance retention characteristics and yellowness after 480 hours in comparison with Comparative Example 1. Specifically, in Examples 1 to 4, the reflection retention ratio was 93.3% or more, whereas Comparative Example 1 was reduced to 92.2%. In addition, in the examples, the yellowness degree showed the lowest value of 8.3, while the comparative example 1 showed a significant difference up to 9.2. That is, the thermoplastic resin composition according to the present invention includes a glass fiber surface-treated with a silicone compound to improve the compatibility between the components in the composition, thereby realizing a physical property-enhancing effect. On the other hand, in Comparative Example 1, And the reflection retention and yellowness were lower than those of the Examples. Thus, it was confirmed that the molded article using the thermoplastic resin according to the present invention can realize high reflectance and excellent optical stability and discoloration resistance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

1: Reflector or housing
2: Electrode or package
3: substrate
4: Sealing resin or blank
5: Wire or lead
6: Photoelectric element (LED)

Claims

(A) a polyester resin, (B) an inorganic filler, and (C) a white pigment,
Wherein at least one of the inorganic filler (B) and the white pigment (C) is surface-treated with a silicone compound,
Wherein the content of silicon is 0.3% by weight to 2% by weight based on the total weight of the components (A), (B) and (C).

The method according to claim 1,
Wherein the polyester resin comprises a unit represented by the following formula (1): < EMI ID =
[Chemical Formula 1]

In Formula 1, m is an integer selected from 10 to 500.

The method according to claim 1,
Wherein the polyester resin (A) has a melting point of 200 占 폚 to 380 占 폚.

The method of claim 3,
Wherein the polyester resin (A) has a melting point of 200 占 폚 to 300 占 폚.

The method according to claim 1,
Wherein the silicone-based compound comprises at least one compound represented by any one of the following Chemical Formulas (2) to (3):
(2)
R ¹ _x Si (R ² ) _4-x
In Formula 2, R ¹ is an alkoxy group having 1 to 5 carbon atoms, and each R ² is independently an acrylate group, a methacrylate group, a vinyl group, an alkylamino group, a cyanate group, an isocyanate group, an epoxy group, A thiol group, a ureido group, a glycidyloxyalkyl group having 1 to 10 carbon atoms, an epoxycycloalkyl group having 1 to 10 carbon atoms or a carboxyl group, and x is an integer of 1 to 3;
(3)
R ³ _n (SiO _{(4-n) / 2} ) _m
In Formula 3, R ³ is each independently selected from the group consisting of hydrogen, an unsubstituted alkyl group, a vinyl substituted alkyl group, an aryl substituted alkyl group, an alkyl substituted alkoxy group, an alkoxy substituted alkylaryldiiyl group, N is from 2 to 3, and m is from 2 to 200.

6. The method of claim 5,
The silicon-based compound may be at least one selected from the group consisting of? - (3,4-epoxycyclohexyl) ethyltrimethoxysilane,? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethylethoxysilane, 2- Epoxycyclohexyl) ethyltriethoxysilane,? -Isocyanatopropyltrimethoxysilane, vinyltriethoxysilane, 2-aminopropyltriethoxysilane, polydimethylsiloxane, vinylphenylmethyl terminated dimethylsiloxane and di Vinyl methyl-terminated polydimethylsiloxane.

The method according to claim 1,
Wherein the composition comprises (A) 50 to 80% by weight of a polyester resin, (B) 5 to 30% by weight of an inorganic filler, and (C) 5 to 30% by weight of a white pigment.

The method according to claim 1,
(B) a thermoplastic resin composition comprising at least one of a carbon-based filler, a glass filler, a metal-based filler, a metalloid filler, clay, kaolin, talc, mica and wollastonite.

The method according to claim 1,
(C) the white pigment comprises at least one of titanium oxide, zinc oxide, zinc sulfide, zinc white, zinc sulfate, barium sulfate, calcium carbonate, alumina and mixtures thereof.

The method according to claim 1,
The composition may be in the form of an antimicrobial agent, a heat stabilizer, an antioxidant, a releasing agent, a light stabilizer, a surfactant, a coupling agent, a plasticizer, a compatibilizer, a lubricant, an antistatic agent, a flame retardant, Wherein the thermoplastic resin composition further comprises at least one additive in a mixture of the thermoplastic resin composition and the thermoplastic resin composition.

A molded article produced from the composition of any one of claims 1 to 10.

12. The method of claim 11,
Wherein the molded article has a reflectance difference of less than 8% expressed by the following formula (1)
<Formula 1>
Reflectance difference (%) = | (F1 - F0) |
In the above formula (1), F0 is the initial reflectance of the molded article, and F1 is the reflectance measured after irradiating the molded article with light at a wavelength of 450 nm for 480 hours in a constant temperature and humidity oven under the conditions of 170 deg.

12. The method of claim 11,
Wherein the molded article has a difference in yellowness represented by the following formula (2): 4.5 or less:
<Formula 2>
Yellowness difference (%) = | (YI1 - YI0) |
In the formula (2), YI0 is an initial yellowness degree of the molded article, and YI1 is a yellowness degree measured after leaving the molded article at 170 DEG C for 480 hours.

12. The method of claim 11,
Wherein the molded article is an accessory of a luminaire comprising an LED element as a light source, the accessory comprising a reflector or a housing.