Resin Composition for LED Reflective Plates
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Solution Overview
Problem
Resin compositions used for reflective plates in LED light-emitting devices face a trade-off between achieving high reflectance and maintaining mechanical strength, particularly impact strength, as increasing the amount of high reflectance fillers like titanium oxide can lead to deterioration in mechanical properties.
Innovation Solution
A resin composition comprising liquid-crystalline polyester and a titanium oxide filler with a volume average particle diameter of 0.27 to 0.4 μm, used in specific proportions to balance reflectance and mechanical strength, allowing for high reflectance while maintaining excellent impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the charging amount of high reflectance imparting agent (titanium oxide) is increased to improve reflectance, then reflectance is improved, but mechanical strength (impact strength) deteriorates
Solution Approach 1:
The invention changes the particle size parameter of titanium oxide from conventional fine particles to specific range (0.27-0.4 μm), and controls the content parameter within 5-110 parts by mass per 100 parts of liquid-crystalline polyester. This parameter optimization allows achieving high reflectance while maintaining impact strength, resolving the contradiction between reflectance improvement and mechanical strength deterioration.
Solution Approach 2:
The invention creates a composite material system combining liquid-crystalline polyester with specifically sized titanium oxide particles. This composite structure enables the titanium oxide to function as a reflectance imparting agent while the controlled particle size and content ratio ensure the mechanical strength is preserved, solving the trade-off between optical performance and mechanical properties.
2Illumination intensity
If the charging amount of high reflectance imparting agent is increased to improve reflectance, then reflectance is improved, but the reflective plate becomes possibly damaged in production process
Solution Approach 1:
By changing the particle size parameter to 0.27-0.4 μm and controlling content within 5-110 parts by mass per 100 parts of polymer, the invention ensures the reflective plate maintains sufficient damage resistance during production while achieving high reflectance. This parameter control prevents the plate from being too fragile despite high filler content.
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 resin composition achieves a reflective plate with high visible light reflectance and sufficient mechanical strength, enabling the production of light-emitting devices with improved brightness and durability.
Implementation Method 1
a high reflectance is required for achieving excellent brightness of the light-emitting device or the like
Data Source
AI summary
The present invention provides a resin composition comprising the component (A) liquid-crystalline polyester, and the component (B) a titanium oxide filler having a volume average particle diameter of 0.27 to 0.4 μm, wherein the component (B) is contained in an amount of from 5 to 110 parts by mass relative to 100 parts by mass of the component (A); a reflective plate of the resin composition, and a light-emitting device having the reflective plate. According to the resin composition of the present invention, it is possible to obtain a reflective plate exhibiting high reflectance of a visible light while keeping excellent mechanical strength of the liquid-crystalline polyester. Also, a light-emitting device excellent in characteristics such as brightness can be obtained using the reflective plate.