Wholly Aromatic Liquid Crystalline Polyester Amide Resin Reflector
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Solution Overview
Problem
Conventional reflector materials, such as polyamide-based resins and wholly aromatic liquid crystalline polyester resins, degrade under high voltage and prolonged exposure to light and heat, leading to reduced reflectance and lifespan in light-emitting devices.
Innovation Solution
A reflector using a wholly aromatic liquid crystalline polyester amide resin compound composed of repeating units derived from hydroxybenzoic acid, hydroxynaphthoic acid, and aminobenzoic acid, without aromatic dicarboxylic acid, combined with a white inorganic filler like titanium oxide, to enhance thermal resistance and maintain reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyamide-based resins are used to manufacture reflectors, then injection molding is efficient and manufacturing is easy, but the resin discolors and decomposes when exposed to light and heat for a long period, reducing reliability and lifespan
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by using wholly aromatic liquid crystalline polyester amide resin instead of polyamide-based resin. This parameter change maintains injection molding efficiency while improving stability under light and heat, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent employs a composite material system combining wholly aromatic liquid crystalline polyester amide resin with specific additives (such as metal acetate catalysts and process aids). This composite approach preserves the manufacturing advantages of injection molding while enhancing the material's resistance to discoloration and decomposition under prolonged light and heat exposure.
2Temperature
If conventional wholly aromatic liquid crystalline polyester resin is used, then thermal resistance is high and micromolding is possible, but the resin cannot form dense structured injection-molded products, causing cracks and reducing initial reflectance
Solution Approach 1:
The patent modifies the resin composition parameters by incorporating specific monomer units (hydroxybenzoic acid, hydroxynaphthoic acid, and aminobenzoic acid) in controlled ratios. This parameter adjustment enables the resin to form dense structured products during injection molding while maintaining high thermal resistance, eliminating cracks and improving surface quality.
Solution Approach 2:
The patent introduces specific catalysts (such as metal acetates) and process additives as intermediaries that facilitate proper molecular arrangement and packing during injection molding. These intermediaries enable the formation of dense structured products with high surface quality while preserving the inherent thermal resistance of the liquid crystalline polyester amide resin.
3Temperature
If conventional wholly aromatic liquid crystalline polyester resin is used in reflectors, then thermal resistance is improved, but reflectance rapidly decreases in the initial stage of reliability evaluation, making brightness unstable
Solution Approach 1:
The patent develops a composite material system combining wholly aromatic liquid crystalline polyester amide resin with specific stabilizing additives and pigment dispersions. This composite formulation maintains high thermal resistance while preventing rapid reflectance decrease, ensuring stable brightness performance in reflectors subjected to prolonged thermal and optical stress.
Solution Approach 2:
The patent converts the potential harm of rapid reflectance decrease into a benefit by incorporating UV-stabilizing agents and antioxidant additives that prevent photodegradation. These additives transform the resin's vulnerability to light exposure into enhanced durability, maintaining reflectance stability while preserving thermal resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reflector with high whiteness and durability, reducing initial reflectance decline and extending the lifespan of light-emitting devices by preventing discoloration and maintaining high emission capability.
Implementation Method 1
The wholly aromatic liquid crystalline polyester amide resin compound further includes a white inorganic filler
Implementation Method 2
a reflector including a wholly aromatic liquid crystalline polyester amide resin compound... provides a reflector with high whiteness and initial reflectance
Implementation Method 3
has high whiteness, initial reflectance of the reflector is less reduced, and discoloration of the reflector caused by light and heat may be prevented
Implementation Method 4
a wholly aromatic liquid crystalline polyester amide resin compound that includes a repeating unit derived from a hydroxybenzoic acid, a repeating unit derived from a hydroxynaphthoic acid, and a repeating unit derived from an aminobenzoic acid
Data Source
AI summary
A reflector and a light-emitting device including the same. The reflector includes a wholly aromatic liquid crystalline polyester amide resin compound that includes a repeating unit derived from a hydroxybenzoic acid, a repeating unit derived from a hydroxynaphthoic acid, and a repeating unit derived from an aminobenzoic acid, but does not include a repeating unit derived from an aromatic dicarboxylic acid, wherein the wholly aromatic liquid crystalline polyester amide resin compound further includes a white inorganic filler.