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Molded reflectors for light-emitting diode assemblies

A reflector and molding technology, which is applied in the direction of reflectors, electrical components, electric solid devices, etc., can solve the problem of resin whiteness index reduction and achieve the effect of improving molding performance

Inactive Publication Date: 2015-09-09
TICONA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yellowing reduces the whiteness index of the resin
Yellowing is especially a problem for blue-emitting LEDs because yellow surfaces tend to absorb light in the blue wavelength range

Method used

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  • Molded reflectors for light-emitting diode assemblies
  • Molded reflectors for light-emitting diode assemblies
  • Molded reflectors for light-emitting diode assemblies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] The following examples are given below by way of illustration and not by way of limitation.

[0101] Table 1 below lists various compositions prepared by melt compounding the components shown in the table using a 32 mm twin screw extruder operating at about 300°C, using a screw speed of about 300 rpm and about 320 °C - a melt temperature of about 330 °C. After leaving the extruder, the composition is cooled and pelletized.

[0102] For each composition, the melt viscosity of pellet samples was determined using a capillary rheometer at 305°C and a shear rate of 1000 / s. A lower melt viscosity generally indicates that the composition fills the mold better.

[0103] The composition was molded into ISO tensile bars according to ISO method 527-1 / 2 using a mold temperature of approximately 120°C. The tensile properties of the samples were determined using the test methods described above. Charpy impact strength is measured according to ISO Test179.

[0104] The reflectanc...

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PUM

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Abstract

Polymer compositions are described that are well suited for producing reflectors for light-emitting devices, such as light-emitting diodes. In one particular embodiment, the polymer composition contains a polymer resin, a white pigment, a silicone compound, and a nucleating agent. The polymer resin may comprise, for instance, a poly(1,4-cyclohexanedimethanol terephthalate). In accordance with the present disclosure, the composition also contains at least one silicone compound and at least one nucleating agent. The silicone compound and nucleating agent have been found to improve the molding processability and reflectance stability of the polymer composition.

Description

Background of the invention [0001] Light emitting diodes, commonly referred to as LEDs, are gaining popularity as light sources for many and different applications. The demand for LEDs has grown rapidly, especially in the past five years. LEDs are used as light sources in many applications due to their many advantages over conventional light sources. LEDs typically consume significantly less power than incandescent and other light sources, require low voltages to operate, are resistant to mechanical vibration, require low maintenance, and generate minimal heat in operation. As a result, LEDs are replacing incandescent and other light sources in many applications and gaining applications, for example as traffic signals, large area displays, interior and exterior lighting, mobile phone displays, digital clock displays, displays for consumer instruments, flashlights, etc. [0002] LEDs generally include light emitting diodes mounted on a substrate, which are electrically connec...

Claims

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Application Information

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IPC IPC(8): C08L67/02H01L33/50H01L33/60F21V7/22
CPCH01L2224/48247H01L33/60C08L67/02H01L2933/0058F21V7/22C08K3/22C08K5/0083C08K5/098C08K7/14C08L83/00C08K3/013H01L2224/48095
Inventor B·卢
Owner TICONA LLC
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