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Polyester resin composition for reflectors of light emitting devices and molded article using same

A technology of polyester resin and composition, applied in the field of polyester resin composition, can solve the problems of reduced whiteness, yellowing and the like

Active Publication Date: 2014-07-09
LOTTE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the highly heat-resistant modified polyester resin is used as an LED reflector, yellowing occurs due to the continuous irradiation of the light source
Yellowing causes reduction in whiteness

Method used

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  • Polyester resin composition for reflectors of light emitting devices and molded article using same
  • Polyester resin composition for reflectors of light emitting devices and molded article using same
  • Polyester resin composition for reflectors of light emitting devices and molded article using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3 and comparative example 1 to 5

[0133] Each component was added in the amount given in Table 1 and melted / kneaded in a twin-screw melt extruder heated to 240°C to 350°C to prepare pellets. The pellets thus obtained were dried at a temperature of 120°C for more than 5 hours, and then samples for evaluation of material properties were manufactured using a screw-type injection device heated to 240°C to 330°C.

[0134] As shown in Table 1, the amount of each component is expressed as parts by weight based on 100 parts by weight of (A) and (B).

[0135] [Table 1]

[0136]

[0137] (Unit: parts by weight)

[0138] The properties of the samples obtained based on the components in Table 1 above were evaluated and the results are shown in Table 2.

[0139] Evaluation methods for material properties

[0140] (1) Heat resistance (HDT): According to ASTM D648, the heat resistance was evaluated by measuring the heat distortion temperature (HDT) lai of a sample having a ...

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Abstract

The present invention provides a polyester resin composition for reflectors of light emitting devices and a molded article using the same. The polyester resin composition includes: (A) a polyester resin having a crystallization temperature of about 200 DEG C to about 400 DEG C; (B) a polyester resin having a crystallization temperature of about 100 DEG C to less than about 200 DEG C; (C) a white pigment; (D) a filler; (E) a nucleating agent; and (F) a chain extender. The polyester resin composition can have superior heat resistance, impact resistance, cooling efficiency, reflectivity, yellowing resistance, and / or fluidity. The polyester resin composition is suitable for reflectors of light emitting devices.

Description

technical field [0001] The present invention relates to polyester resin compositions and molded articles using the same. More specifically, the present invention relates to a polyester resin composition that can have excellent heat resistance, impact resistance, cooling efficiency, reflectivity, yellowing resistance, and / or fluidity and can be suitable for a reflector of a light emitting device and Molded articles made using it. Background technique [0002] Recently, polyester-based resins have been used to prepare parts for light-emitting diodes (hereinafter "LEDs"). Due to their excellent energy efficiency and long lifetime, LEDs are rapidly replacing existing light sources. Polyester-based resins can be used for reflectors, reflector cups, scramblers, housings, etc. as LED components. [0003] LEDs generally include a semiconductor portion that emits light, wires, a reflector as a housing, and a transparent encapsulant that encapsulates the semiconductor portion. Ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K13/04C08K7/14C08K5/098C08K3/22C08K5/1515
CPCC08K3/22C08K5/098C08K7/14C08L67/02C08L2205/02C08G63/16C08L67/00C08L67/03
Inventor 李相和李炫虎白寅杰洪尚铉林钟喆
Owner LOTTE ADVANCED MATERIALS CO LTD
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