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Reflection plate and light emitting device

A technology for light-emitting devices and reflectors, applied in reflectors, lighting devices, components of lighting devices, etc., to achieve the effects of excellent heat resistance and excellent reflectivity

Inactive Publication Date: 2009-09-02
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, although the reflecting plate in JP-A-2004-256673 has a satisfactory reflectance when a relatively small amount of titanium dioxide is added, there may be room for improving the reflectance

Method used

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  • Reflection plate and light emitting device
  • Reflection plate and light emitting device
  • Reflection plate and light emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] In a reactor equipped with a stirrer, torque meter, nitrogen inlet tube, thermometer and reflux condenser, 994.5 g (7.2 mol) of p-hydroxybenzoic acid, 446.9 g (2.4 mol) of 4,4'-bis Hydroxybiphenyl, 299 g (1.8 mol) of terephthalic acid, 99.7 g (0.6 mol) of isophthalic acid and 1347.6 g (13.2 mol) of acetic anhydride, and 0.2 g of 1-methylimidazole were added. After the atmosphere in the reactor was sufficiently replaced with nitrogen and heated to 150°C in 30 minutes under nitrogen flow, the mixture was refluxed for 1 hour while maintaining the temperature.

[0132] 1-Methylimidazole (0.9 g) was added and, thereafter, heated to 320° C. over 2 hours and 50 minutes while distilling off acetic acid and unreacted acetic anhydride produced as by-products. After the reaction was complete, ie after confirming the increase in torque, a prepolymer was obtained.

[0133] The formed prepolymer was cooled to room temperature, ground by a coarse grinder, heated from room temperature...

Embodiment 2-5 and comparative Embodiment 1-6

[0136] The liquid crystal polyester 1 used in Example 1 was mixed with various fillers at the mixing ratio shown in Table 1 to obtain a resin composition. Reflection plate samples have been obtained in the same manner as in Example 1, and various measurements have been performed. The results are shown in Table 1 and Table 2.

[0137] Table 1

[0138]

[0139] Table 2

[0140]

[0141] As shown in Table 1, compared with the sample without the silica-based filler (component (C)) added thereto (see Comparative Examples 1-5), all components (A)-(C ) samples showed higher reflectivity (see Examples 1-5). It was found that although a sample with high reflectance could be obtained by using a large amount of titanium dioxide filler (see Comparative Example 2), the sample had sharply degraded heat resistance when soldered. In the samples containing glass-made fillers (glass beads) used in place of silica-based fillers (see Comparative Examples 3-5), the samples had a higher p...

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PUM

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Abstract

The present invention provides a reflection plate made of a resin composition comprising a liquid crystalline polyester, a titanium oxide filler and a silica-based filler containing 85% by weight or more of silicon oxide, wherein the resin composition contains the titanium oxide filler in the amount of from 5 to 80 parts by weight and the silica-based filler in the amount of from 0.01 to 20 parts by weight on the basis of 100 parts by weight of the liquid crystalline polyester. The reflection plate has an excellent reflectance, especially to light in a visible range, while maintaining excellent heat resistance of the liquid crystalline polyester.

Description

technical field [0001] The present invention relates to a reflective plate excellent in reflectivity and heat resistance, and a light-emitting device using the reflective plate. Background technique [0002] Liquid crystal polyesters have utilized titanium dioxide as a filler to provide a resin composition for producing reflective plates for LED (Light Emitting Diode) lighting devices due to its high molding processability and high heat resistance. [0003] For example, Japanese Unexamined Patent No. (JP-A-) 2007-320996 discloses a resin composition useful in producing reflective plates adjacent to light sources, which composition contains liquid crystals, titanium dioxide and blue coloring substances (blue coloring matter). Also, JP-A-2004-256673 discloses a reflective plate obtainable from a resin composition comprising a liquid crystal polyester having a YI value of 32 or less and titanium dioxide. [0004] It seems that in order to produce a molded article having a ref...

Claims

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Application Information

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IPC IPC(8): G02B1/04G02B5/08F21V7/00F21Y101/02C08L67/00C08K3/22C08K3/36C09K19/38C08K7/02F21V7/22G02B5/02
CPCG02B5/0808
Inventor 斋藤慎太郎岩濑定信原田博史
Owner SUMITOMO CHEM CO LTD
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