KR20130037871A

KR20130037871A - Polymer resin compound with high thermal stability with consistent luminance reliability, reflectors and lighting emitting devices made from the same

Info

Publication number: KR20130037871A
Application number: KR1020110102372A
Authority: KR
Inventors: 이윤응; 이진규
Original assignee: 삼성정밀화학 주식회사
Priority date: 2011-10-07
Filing date: 2011-10-07
Publication date: 2013-04-17

Abstract

PURPOSE: A resin composition for manufacturing semiconductors is provided to prevent the loss of reflectivity and to provide a reflector with excellent lifetime stability. CONSTITUTION: A resin composition for manufacturing a semiconductor comprises a mixed resin a wholly aromatic liquid crystal polymer resin and engineering plastic resin mixed of 1:99-30:70 or 70:30-99:1. The resin composition comprises 10-60 weight% of white inorganic filler, 5-60 weight% of a glass fiber and/or 5-40 weight% of a wollastonite or talc. The white inorganic filler is oxide titanium. The engineering plastic resin is polyamide-based resin, polyphthalamide-based resin, or terephthalate resin.

Description

Resin composition with high thermal stability with consistent luminance reliability, reflectors and lighting emitting devices made from the same}

The present invention relates to a resin composition for producing a reflector having high thermal stability and having improved characteristics of a luminance deterioration phenomenon. The present invention also relates to a reflector and a light emitting device manufactured from the resin composition.

Reflectors used in light emitting devices such as LEDs (light emitting diodes) are required to have a characteristic that the luminance and the whiteness do not decrease when exposed to light or heat for a long time.

Conventionally, the material for manufacturing a reflector has been used polyamide-based resin such as PPA (Polyphthalamide), PA9T that is easy to injection, and recently, terephthalate-based resin such as polycyclohexylenedimethyleneterephthalate (PCT), which has better thermal stability than polyamide-based resin. The use of is being considered. However, in the case of polyamide-based resins, long-term exposure to light or heat, such as power LEDs or Xenons, where high voltage is used, discoloration and decomposition of polymers occur and thus do not function as reflectors, thereby reducing the function and life of the light emitting device. Have. On the other hand, in case of terephthalate resin, it is difficult to process into the desired reflector shape because of poor flow during injection and long cooling speed, and it is discolored due to heat due to its weak heat resistance when applied to power LED, which is emerging as a new trend of light emitting device. It is evaluated that there is a characteristic to become.

On the other hand, the wholly aromatic liquid crystal polymer resin, which is emerging as a new reflector material, has excellent heat resistance, excellent dimensional stability, fluidity during melting, electrical insulation and strength properties, and enables fine molding. It is widely used as a center.

However, in the case of the wholly aromatic liquid crystal polymer resin, the structure of the molded product is not dense and cracks are often generated during the injection, and the initial whiteness, reflectance, and brightness are compared with those of the conventional polyamide resin or terephthalate resin. When exhibits low characteristics. Particularly, the brightness decreases rapidly in the early stages of reliability evaluation, so the brightness and saturation of the screen when used as a reflector of the BLU (back light unit) emitter for TV, which is required for stability against long time light and heat exposure There is a problem that is unstable and difficult to use.

1) JP-P-2003-00409801 2) JP 2004-277539 3) USP 7138667 4) USP 6599768 5) USP 7202505 6) JP 2007-300018 The above-mentioned document 1) uses a polyamide resin to provide a reflecting plate that is excellent in adhesion to sealing resins such as mechanical strength, heat resistance, epoxy resin, etc. of moldings, and has a low light reflectance drop when the resin composition is used as a reflecting plate. It is about. Document 2) discloses a technique of using a liquid crystal polymer polyester as a reflector and using an aromatic diol and an aromatic dicarboxylic acid monomer. Document 3) discloses a technique of applying a wholly aromatic liquid crystal polymer resin to the LED lead frame material. In the document 4), the wholly aromatic liquid crystal polymer resin is used for the power LED device. Document 5) suggests that the wholly aromatic polyester resin can be used as a heat sink or reflector of an LED.

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin composition for manufacturing a reflector, which is a resin composition for use as a reflector material of a light emitting device.

It is also an object of the present invention to provide a reflector and a light emitting device having excellent life stability upon exposure to heat and light for a long time.

The present invention provides a resin composition for manufacturing a reflector, comprising a mixed resin of a wholly aromatic liquid crystal polymer resin and an engineering plastic resin mixed in a weight ratio of 1:99 to 30:70 or 70:30 to 99: 1.

Preferably, the resin composition comprises a white inorganic filler in the range of 10 to 60% by weight.

Preferably, the white inorganic filler is titanium oxide.

Preferably, the resin composition comprises a glass fiber in the range of 5 to 60% by weight.

Preferably, the resin composition comprises talc or wollastonite in the range of 5 to 40% by weight.

Preferably, the wholly aromatic liquid crystal polymer resin is at least one aromatic selected from the group consisting of aromatic diols, aromatic diamines, aromatic hydroxyamines, aromatic dicarboxylic acids, aromatic hydroxy carboxylic acids and aromatic amino carboxylic acids. It is synthesize | combined from the polycondensation reaction of a compound monomer.

Preferably, the aromatic compound includes a form in which substituted or unsubstituted phenylene, biphenylene, naphthalene or two phenylenes are connected by carbon or non-carbon elements.

Preferably, the engineering plastic resin is a polyamide resin, polyphthalamide resin or terephthalate resin.

The present invention provides a reflector, which is produced from the resin composition.

The present invention provides a light emitting device comprising the reflector.

According to the present invention, there is provided a resin composition for manufacturing a reflector of a light emitting device, which has high thermal stability and exhibits improved characteristics of reduced luminance. Therefore, the reflector prepared from the resin composition of the present invention shows little change in reflectance even when exposed to heat and light for a long time. In addition, the reflector also exhibits a high initial reflectance.

The present invention is a resin composition for manufacturing a light-emitting device reflector having excellent thermal stability and improved brightness deterioration, it is a wholly aromatic liquid crystal polymer resin and engineering plastic mixed in a weight ratio of 1:99 to 30:70 or 70:30 to 99: 1 The resin composition characterized by including the mixed resin of resin.

The present invention uses a mixed resin containing a wholly aromatic liquid crystal polymer resin and an engineering plastic resin as a resin composition for manufacturing a reflector, which is generated by heat when used for a long time, which is a problem of polyamide-based resin and terephthalate-based resin, which has been used as a material for manufacturing a reflector. It improves the discoloration problem and productivity problem due to the decrease of fluidity and delay of cooling speed, minimizes the change of reflectance which occurs in the existing wholly aromatic liquid-crystalline polymer resin when exposed to heat or light for a long time, and improves the brightness deterioration phenomenon. This is to solve the problem of sudden drop in luminance at the beginning.

The wholly aromatic liquid crystal polymer resin which is one component of the mixed resin included in the resin composition of the present invention may be prepared through the following steps:

(a) synthesizing the prepolymer of the wholly aromatic liquid crystal polymer resin by polycondensing at least two aromatic compound monomers, and

(b) synthesizing the wholly aromatic liquid crystal polymer resin by solid-phase polycondensation of the prepolymer;

In step (a), a polycondensation reaction between at least one aromatic compound selected from the group consisting of aromatic diols, aromatic diamines and aromatic hydroxyamines and aromatic dicarboxylic acids occurs. In the present invention, polycondensation reaction of aromatic hydroxy carboxylic acid or aromatic amino carboxylic acid may be used, or these may be additionally used together with the diol, diamine or hydroxyamine and dicarboxylic acid to cause condensation polymerization. have.

The reaction of step (a) may be carried out by a solution condensation polymerization method or bulk condensation polymerization method.

In addition, in step (a), the monomers are pretreated with a chemical agent such as an acylating agent (particularly an acetylating agent) to increase the reactivity (ie, in the form of an acylated monomer) in order to promote the polycondensation reaction. Can be used.

Next, for the solid phase polycondensation reaction of the step (b) it is subjected to condensation polymerization while providing heat to the prepared prepolymer. Such a heat providing method includes a method using a heating plate, a method using hot air, or a method using a high temperature fluid. In addition, the purge or vacuum using an inert gas to remove the by-products generated during the solid state polycondensation reaction can be carried out.

The wholly aromatic liquid crystal polymer resin may contain various repeating units in the polymer chain as follows according to the aromatic compound monomer used in the polymerization reaction:

(1) repeating units derived from aromatic diols:

[-O-Ar-O-]

(2) repeating units derived from aromatic diamines:

[-HN-Ar-NH-]

(3) repeating units derived from aromatic hydroxyamines:

[-HN-Ar-O-]

(4) repeating units derived from aromatic dicarboxylic acids:

[-OC-Ar-CO-]

(5) repeating units derived from aromatic hydroxy carboxylic acids:

[-O-Ar-CO-]

(6) repeating units derived from aromatic amino carboxylic acids:

[-HN-Ar-CO-]

Ar in the repeating units of Formulas (1) to (6) may be a form in which substituted or unsubstituted phenylene, biphenylene, naphthalene or two phenylenes are connected by carbon or non-carbon elements.

Next, the engineering plastic resin which is another component of the mixed resin contained in the resin composition of this invention is heat-resistant polyamide resin, such as PA46 and PA66; Polyphthalamide resins such as PA6T, PA6I, PA6T / PA6I, PA9T, PA10T, PA11T and PA12T; Or terephthalate resins such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET) and polycyclohexadimethanol terephthalate (PCT).

The engineering plastic resin is for the purpose of improving the whiteness and strength of the resin composition of the present invention, improving adhesion to the metal or encapsulation material used as the lead frame and the silicon or epoxy material, and improving the brightness deterioration phenomenon. Used.

As the engineering plastic resin, the polyamide-based, polyphthalamide-based and terephthalate-based resins may be used alone or in combination. In this case, the mixing ratio of the wholly aromatic liquid crystal polymer resin and the engineering plastic resin in the mixed resin is preferably used by mixing in a weight ratio of 1:99 to 30:70 or 70:30 to 99: 1.

When polyamide-based or polyphthalamide-based resin is used in an amount of 30 to 70% by weight based on the total weight of the mixed resin, phase separation occurs between the polyamide-based or polyphthalamide-based resin and the wholly aromatic liquid crystal polymer resin, resulting in unmolding during injection. This is because there are no variations and the effect of improving desired characteristics such as whiteness, reflectance, heat resistance and luminance does not occur.

In addition, when terephthalate-based resin is used in an amount of 30 to 70% by weight based on the total weight of the mixed resin, the mixing process and the injection process of the resin are not smooth due to the flow difference with the wholly aromatic liquid crystal polymer resin, This is because product defects occur due to air bubbles generated on the surface of the product.

Next, the resin composition of the present invention may include a white inorganic filler. The white inorganic filler serves to increase the whiteness of the resin composition to improve the reflection function of the reflector prepared from the resin composition. Titanium oxide, for example titanium dioxide, may be used as the white inorganic filler. In addition, silica or alumina-based compounds (for example, SiO ₂ , Al ₂ O ₃ ) and the like to have a dispersibility, oxidizing properties, durability, anti-oxidation function or the surface by hydrophobic or hydrophilic surface treatment composition Adhesion with resin can be improved.

The white inorganic filler is preferably used in an amount of 10 to 60% by weight based on the resin composition of the present invention. When the content of the white inorganic filler is used in less than 10% by weight relative to the resin composition, it does not affect the improvement of the whiteness of the injection molded article, and when it exceeds 60% by weight, the effect of improving the whiteness of the injection molded article is insufficient, and the tensile strength and the bending are relatively high. The loss of strength increases sharply.

In addition, the resin composition for manufacturing a light-emitting device reflector of the present invention may further include an inorganic material such as glass fiber, wollastonite, talc. The inorganic material serves to improve mechanical strength without lowering the reflecting function of the reflector. In particular, wollastonite and talc are used to solve the problems of surface roughness, weighing during injection, and reduced adhesion with other materials, which may be caused by the use of glass fibers or rapid cooling of the resin.

Glass fiber is preferably used in an amount of 5 to 60% by weight based on the resin composition. When glass fiber is used in an amount of less than 5% by weight with respect to the resin composition, the strands are frequently cut during processing, so that the compound yield is low, and there is no supporting force to support the structure of the injection molded product during injection. It is unstable, and the phenomenon of low tensile strength and flexural strength occurs. On the other hand, when the content exceeds 60% by weight, the injection molded article is excessively elastic due to excessive elastic modulus, and thus, unmolding may occur due to the crushing phenomenon caused by poor dispersibility of glass fibers in the injection molded article. The strength of the product is not constant. In addition, the glass fiber protrudes out of the injection molded product, the surface is not smooth, and the adhesion to the mixed resin is reduced.

Wollastonite or talc is preferably used in an amount of 5 to 40% by weight based on the resin composition. When wollastonite or talc is used in an amount of less than 5% by weight with respect to the resin composition, the surface and strength improvement effect due to the addition of wollastonite during processing is insignificant, and when it exceeds 40% by weight, extrusion of the resin composition has an effect of improving the surface during injection. Cutting of the strand frequently occurs, resulting in lower yields.

The resin composition for manufacturing the light-emitting device reflector of the present invention may be prepared by mixing and mixing the inorganic materials such as the wholly aromatic liquid crystal polymer resin, the engineering plastic resin, the white inorganic filler, and the glass fiber in a predetermined ratio, followed by melt kneading and drying. A batch kneader, a twin screw extruder or a mixing roll may be used for melt kneading the mixture. In addition, for smooth melt kneading, a lubricant such as a fluoro lubricant may be used during melt kneading.

In addition, the resin composition of the present invention may be injection molded into various types of reflectors such as circular, plates, cups or lampshades having a thickness of 0.1 mm to 100 mm using an injection molding machine of a pressure control method or a speed control method. In this injection molding, the resin composition may be insert injected into the frame, or may be injected alone. The reflector manufactured as described above may be used in various light emitting devices such as a light emitting diode (LED).

The invention will be described in detail through the following examples. However, this is to facilitate the understanding of the invention, and therefore the present invention should not be considered as being limited thereto.

Manufacturing example 1-1: Wholly aromatic Preparation of Liquid Crystal Polymer Resin

Parahydroxy benzoic acid in a 10 liter batch reactor with temperature control

3.018 kg, hydroxy naphthalene acid 1.300 kg and 0.3 g of potassium acetate as a catalyst were added and nitrogen gas was injected to make the internal space of the reactor inactive, and then 3.024 kg of acetic anhydride was further added to the reactor. The reactor temperature was then raised to 150 ° C. over 30 minutes and acetylated alcohol functional groups of the monomers at this temperature for 2 hours. Subsequently, the reaction temperature was raised to 320 ° C. over 5 hours and 20 minutes while removing the acetic acid generated in the acetylation reaction, and then maintained for 20 minutes to prepare a wholly aromatic liquid crystal polyester prepolymer by a polycondensation reaction of the monomers. Further acetic acid is produced as a byproduct in the preparation of the prepolymer, which is also removed continuously during the prepolymer preparation together with the acetic acid produced in the acetylation reaction.

Next, the prepolymer was recovered from the reactor and cooled and solidified.

Thereafter, the prepolymer was pulverized to an average particle diameter of 1 mm, and then 3 kg of the pulverized prepolymer was introduced into a rotary kiln reactor having a capacity of 10 liters, and nitrogen was continuously flowed at a flow rate of 1 Nm 3 / hour to 1 to 200 ° C. at a weight loss start temperature. After heating up over time, it heated up again over 6 hours to 290 degreeC, and maintained for 5 hours, and prepared the wholly aromatic liquid-crystal polymer resin. Subsequently, the reactor was cooled to room temperature over 1 hour, and then the wholly aromatic liquid crystal polymer resin was recovered from the reactor.

Manufacturing example 1-2: Wholly aromatic Preparation of Liquid Crystal Polymer Resin

In a 100 liter batch reactor with temperature control, 22.2 kg para hydroxy benzoic acid (UENO Fine Chemirals), 9.6 kg biphenol (Songwon), 6.9 kg terephthalic acid (Samsung Petrochemical) and isophthalic acid (Perstorp) 2.2 kg was added and nitrogen gas was injected to make the inner space of the reactor inactive, and then 39 kg of acetic anhydride (CELANESE) was further added to the reactor. Thereafter, the reactor temperature was raised to 150 ° C. over 30 minutes, and then the alcohol group (hydroxy group) of the monomers was acetylated for 3 hours at this temperature.

Subsequently, the temperature of the reactor was raised to 330 ° C. over 6 hours while removing the acetic acid generated in the acetylation reaction, thereby preparing a wholly aromatic liquid crystal polyester prepolymer by the polycondensation reaction of the monomers. Acetic acid is further generated as a by-product during the preparation of the prepolymer, and the acetic acid is continuously removed during the preparation of the prepolymer similarly to the acetic acid produced in the acetylation reaction.

After completion of the reaction, the prepolymer was recovered from the reactor and cooled and solidified. Thereafter, the prepolymer was pulverized to an average particle diameter of 1 mm, 20 kg of the pulverized prepolymer was introduced into a rotary kiln reactor having a capacity of 100 liters, and nitrogen was continuously flowed at a flow rate of 1 Nm 3 / hour, followed by a weight loss start temperature of 200 ° C. in 1 hour. After heating up over, it heated up again to 320 degreeC over 10 hours, and maintained for 3 hours, and prepared the wholly aromatic liquid-crystal polymer resin.

Subsequently, after cooling the reactor to room temperature over 1 hour, the wholly aromatic liquid crystal polymer resin was recovered from the reactor.

Manufacturing example 2-1: Manufacture of Engineering Plastic Resins

Into a temperature controlled 1.0 liter reactor, 194.2 g (1.0 mol) of dimethyl terephthalate (TPDM), 216.2 g (1.5 mol) of 1,4-cyclohexanedimethanol (CHDM) and nitrogen gas were added to the reactor. After making the inert state, 0.3 g of a polymerization Ti catalyst tetrabutoxytitanium (Ti (OC ₄ H ₉ ) ₄ ) was added to the reactor.

The reactor temperature was raised from room temperature to 230 ° C. over 90 minutes and then held at that temperature for 1 hour. The reactor internal temperature was raised to 300 ° C. over 1 hour while the methanol produced by the transesterification reaction was then maintained at this temperature for 1 hour. Thereafter, the inside of the reactor was decompressed under vacuum (1.0 Torr or less) while maintaining the internal temperature at 300 ° C., followed by the polycondensation reaction for 5 hours. Excess 1,4-cyclohexanedimethanol (CHDM) was removed to give polycyclohexanedimethyl terephthalate (PCT).

Comparative example One

The wholly aromatic liquid crystal polymer resin prepared in Preparation Example 1-1, with a length distribution of 100 to 300 µm, an average length of 150 µm, and a glass fiber having a diameter of 10 ± 1 µm (Seongjin Fibar, MF150W-AC) and UV Titanium oxide (Dupont T-Pure R-105) coated with stable alumina, silica, and hydrophobic organic compounds was mixed in a ratio of 5: 1: 4 by weight, using a batch mixer (product of the first industrial machine). Mix for a minute. After drying at 130 ° C. for more than 4 hours in an oven drier (Asung PLANT product), the water content was lowered to 200 wt.ppm or less, and then 10 kg per hour using a twin screw extruder (Collin product, L / D: 40, diameter: 25 mm). Melt kneading while quantitatively feeding at a feed rate of gave a wholly aromatic liquid crystal polymer resin composition. In order to remove the gas and by-products generated during the melt kneading, one open vent and one vacuum vent are installed in barrels 3 and 7 of the twin screw extruder, respectively. The resin composition thus prepared was pelletized after cooling and water removal using a cooling facility (Sewon M-Tech product, mesh conveyor belt). Subsequently, the pellets of the resin composition prepared above were dried and mixed for 2 hours using an automatic dryer (product of the first industrial machine).

The prepared resin composition was dried at 130 ° C. for at least 4 hours using an oven dryer (made by Azant PLANT) to lower the water content to 200 wt.ppm or less, and was then 0.3 mm thick using an electric injection machine (Sodick, TR30EH2). A 2 mm rectangular (50 x 50 mm) plate-shaped reflector was prepared.

Comparative example 2

A resin composition was prepared in the same manner as in Comparative Example 1, except that the wholly aromatic liquid crystal polymer resin prepared in Preparation Example 1-2 was used in place of the wholly aromatic liquid crystal polymer resin prepared in Preparation Example 1-1.

In addition, a plate-shaped reflector was manufactured in the same manner as in Comparative Example 1.

Comparative example 3

A plate-like reflector of the same type as in Comparative Example 1 was prepared from New Japan Petrochemical's wholly aromatic liquid crystal polymer resin compound CX-1111 commonly used as a material for producing a reflector.

Comparative example 4

The same type of plate-like reflector as in Comparative Example 1 was prepared from polyamide resin compound 9T (TA112) manufactured by Kuraray Co., Ltd., which is commercially available as a material for preparing a reflector.

Comparative example 5

A plate-like reflector of the same type as in Comparative Example 1 was prepared from a polycyclohexylenedimethylene terephthalate resin compound TE-4007 manufactured by Tychonas Co., Ltd. as a material for producing a reflector.

Example One

Polycyclohexylenedimethylene terephthalate resin prepared in Preparation Example 2-1, wholly aromatic liquid crystal polymer resin prepared in Preparation Example 1-1, length distribution of 100 ~ 300㎛, average length of about 150㎛ and diameter 10 5: 1: 1 by weight of glass fibers (Sungjin Fibar, MF150W-AC) with UV stability and UV-stable alumina and silica, titanium oxide coated with a hydrophobic organic compound (Dupont T-Pure R-105) A resin composition for producing a reflector was prepared in the same manner as in Comparative Example 1, except that the mixture was mixed at a ratio of 3: 3 for 30 minutes using a batch mixer (product of the first industrial machine).

Example 2

A resin composition for producing a reflector was manufactured in the same manner as in Example 1, except that the wholly aromatic liquid crystal polymer resin of Preparation Example 1-2 was used instead of the wholly aromatic liquid crystal polymer resin of Preparation Example 1-1.

Reflector performance evaluation

(Thermal stability evaluation)

100 samples per reflector prepared in Examples and Comparative Examples were measured with a colorimeter (Konica Minolta, CM-3700d) to measure the reflectance of the reflector immediately after injection, and then maintained at a temperature of 200 ° C. PLANT product) and reflector samples were measured every 20 hours from immediately after injection to 200 hours to evaluate the thermal stability.

The smaller the change in reflectance with time, the higher the thermal stability. That is, by measuring the reflectance of 100 samples per reflector at a wavelength interval of 10 nm over a wavelength range of 360 nm to 740 nm using a color difference meter, the average value for each wavelength of these samples is obtained, and the standard of reflectance commonly used The value at 550 nm is expressed as the reflectance of each reflector.

The measured reflectances are summarized in Table 1 below.

Standard deviation≤0.05%

Referring to Table 1, the reflector using a mixture of the wholly aromatic liquid crystal polymer resin and the engineering plastic resin of Examples 1 to 2 has a high initial reflectance and thermal stability compared to Comparative Examples 1 to 2, which are reflectors made only of the liquid crystal polymer resin Also found to be equal or superior.

In addition, Examples 1 to 2 were excellent in initial reflectance and similar to or superior in thermal stability compared to the reflector manufacturing material CX-1111, which is generally used in Comparative Example 3, and was evaluated as a polyamide resin compound of Comparative Example 4. Compared with 9T (TA112), the initial reflectance was evaluated to be low, but the thermal stability over time when exposed to heat was evaluated as being very good, compared with the polycyclohexylenedimethylene terephthalate resin compound TE-4007 of Comparative Example 5. It was evaluated that the initial reflectance and thermal stability were excellent.

(Evaluation of brightness fall)

100 samples per reflector prepared in Examples and Comparative Examples were taken and the reflectance of each reflector sample immediately after injection was measured using the same measuring apparatus as the evaluation of thermal stability, and then sealed with Xenon light. The reflectance was measured every 20 hours from immediately after injection to 200 hours in order to evaluate the decrease in luminance. The smaller the change in reflectance with time, the better the improvement effect on the decrease in luminance.

That is, by measuring the reflectance of 100 samples per reflector at a wavelength interval of 10 nm over a wavelength range of 360 nm to 740 nm using a color difference meter, the average value for each wavelength of these samples is obtained, and the standard of reflectance commonly used The value at 550 nm is expressed as the reflectance of each reflector.

The measured reflectances are summarized in Table 2 below.

Standard deviation≤0.1%

Referring to Table 2, the reflector using a mixture of the wholly aromatic liquid-crystalline polymer resin and the engineering plastic resin of Examples 1 to 2 is that the brightness reduction phenomenon is improved compared to Comparative Examples 1 to 2, which is a reflector made only of the liquid crystal polymer resin appear. The reflectors of Comparative Examples 1 and 2 showed a tendency that the reflectance decreased with the passage of time after exposure to light and reached a maximum at the 140 hr point. However, the reflectors of Examples 1 and 2 exhibited such a decrease in reflectance. Did not appear.

In addition, Examples 1 to 2 were excellent in initial reflectance and excellent in light stability compared to the reflector manufacturing material CX-1111, which is generally used in Comparative Example 3, and the characteristics of light in Comparative Example 4 Compared with the excellent polyamide resin compound 9T (TA112), the decrease in the reflectance was evaluated to be improved compared to the initial reflectance, and the initial reflectance and luminance compared with the polycyclohexylenedimethylene terephthalate resin compound TE-4007 of Comparative Example 5 All of the degradations were evaluated to be improved.

Claims

A resin composition for manufacturing a reflector, comprising a mixed resin of a wholly aromatic liquid crystal polymer resin and an engineering plastic resin mixed in a weight ratio of 1:99 to 30:70 or 70:30 to 99: 1.

In claim 1,
The resin composition is a resin composition for producing a reflector, characterized in that it comprises a white inorganic filler in the range of 10 to 60% by weight.

In claim 2,
Said white inorganic filler is titanium oxide, The resin composition for manufacturing a reflector characterized by the above-mentioned.

In claim 1,
The resin composition is a resin composition for producing a reflector, characterized in that it comprises a glass fiber in the range of 5 to 60% by weight.

In claim 1,
The resin composition is a resin composition for producing a reflector, characterized in that it comprises talc or wollastonite in the range of 5 to 40% by weight.

In claim 1,
The wholly aromatic liquid-crystalline polymer resin is at least one aromatic compound monomer selected from the group consisting of aromatic diols, aromatic diamines, aromatic hydroxyamines, aromatic dicarboxylic acids, aromatic hydroxy carboxylic acids and aromatic amino carboxylic acids. It is synthesize | combined from polycondensation reaction, The resin composition for reflector manufacture characterized by the above-mentioned.

The method of claim 6,
The aromatic compound is a resin composition for manufacturing a reflector, characterized in that the substituted or unsubstituted phenylene, biphenylene, naphthalene or two phenylene is a form connected by carbon or non-carbon elements.

In claim 1,
The engineering plastic resin is a resin composition for manufacturing a reflector, characterized in that the polyamide resin, polyphthalamide resin or terephthalate resin.

It is manufactured from the resin composition of any one of Claims 1-8, The reflector characterized by the above-mentioned.

A light emitting device comprising the reflector of claim 9.