Polyester composition for LED reflective plates, LED reflective plate, and light emitting device equipped with said reflective plate

Abstract

Provided is a polyester composition for LED reflective plates that includes a polyester (A), titanium oxide (B), a phenolic antioxidant (C), and a phosphorus-based antioxidant (D). The polyester (A) has a structural unit derived from a dicarboxylic acid that includes at least 50 mol% of terephthalic acid and a structural unit derived from a diol that includes at least 50 mol% of 1,4-cyclohexanedimethanol. The phosphorus-based antioxidant (D) includes at least three of the group represented by formula (1) in the molecule thereof. Relative to 100 parts by mass of the polyester (A), the content of the titanium oxide (B) is 20-90 parts by mass, and the content of the phenolic antioxidant (C) is 0.1-0.8 parts by mass. The content of the phosphorus-based antioxidant (D) satisfies formula (I). Also provided are an LED reflective plate comprising the composition and a light emitting device equipped with the reflective plate. Formula (I): 0.20< / =mass ratio [component (C) / component (D)]< / =5.00.

Description

technical field [0001] The invention relates to a polyester composition for an LED reflector. Specifically, it relates to a polyester composition for LED reflectors having high light reflectance and capable of maintaining high light reflectance even after exposure to heat and light, an LED reflector comprising the composition, and a light-emitting device including the reflector . Background technique [0002] Light-emitting diodes (hereinafter also referred to as "LEDs") have many advantages such as low power consumption and long life compared with conventional white light lamps and fluorescent lamps, so they are used in various fields. They are used in mobile phone displays, personal Small electrical and electronic products such as backlights for LCD panels of computers and LCD TVs. [0003] LED packages are generally composed of LEDs, lead frames, reflectors that double as housings, and sealing members that seal semiconductor light-emitting elements. As LED reflectors, p...

AI Technical Summary

Problems solved by technology

[0004] However, reflectors using polymer materials have the following problems: the light reflectance decreases due to heat in the manufacturing process of the LED package, and the light reflectance decreases due to the use environment such as ultraviolet irradiation.

[0008] However, the light reflectance and the maintenance of high light reflectance after exposure to the manufacturing process of the LED package, heat in the use environment, and light are still insufficient, and further improvement is sought.

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