Aromatic Polycarbonate Light Guide Plate Thin Wall Molding
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Solution Overview
Problem
Conventional light guide plates made from aromatic polycarbonate resin materials fail to achieve the desired thin thickness and large size due to inadequate fluidity, thermal stability, and moldability, resulting in poor practical value and reduced luminance.
Innovation Solution
Aromatic polycarbonate resin composition with a viscosity-average molecular weight of 13,000 to 15,000 and a weight-average to number-average molecular weight ratio of 1.5 to 2.7, blended with a stabilizer and releasing agent, is used to produce a light guide plate with enhanced mechanical strength, transfer property, and light transmittance, allowing for molding into thin thicknesses of up to 0.44 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional resin materials (PMMA) are used for light guide plates, then ease of manufacture is maintained, but thermal stability deteriorates under high temperature exposure
Solution Approach 1:
The patent changes the chemical composition parameters of the resin material by using aromatic polycarbonate resin with specifically controlled molecular weight (Mv = 10,000 to 30,000) and molecular weight distribution (Mw/Mn = 1.5 to 2.7), transforming the material from conventional PMMA to a high-temperature resistant aromatic polycarbonate that maintains manufacturability while improving thermal stability
Solution Approach 2:
The patent creates a composite resin composition by blending aromatic polycarbonate resin with specific additives including stabilizers (0.01-5 wt%), releasing agents (0.01-5 wt%), and nucleating agents (0.01-5 wt%), forming a composite material that combines the thermal stability of aromatic polycarbonate with the functional benefits of additives to maintain ease of manufacture
2Length of moving object
If light guide plate thickness is reduced below 0.7 mm to meet thin display requirements, then the thickness parameter is improved, but fluidity and moldability deteriorate making cavity filling difficult
Solution Approach 1:
The patent changes the molecular weight parameters of the aromatic polycarbonate resin to a specific range (Mv = 10,000 to 30,000, Mw/Mn = 1.5 to 2.7), which optimizes the fluidity and moldability of the resin, enabling successful injection molding of light guide plates with thicknesses below 0.7 mm while maintaining ease of manufacture
Solution Approach 2:
The patent applies local quality by adding specific functional additives at controlled concentrations: stabilizers (0.01-5 wt%) for thermal stability, releasing agents (0.01-5 wt%) for mold release, and nucleating agents (0.01-5 wt%) for crystallization control, creating localized improvements in specific properties while maintaining overall fluidity for thin plate manufacturing
3Productivity
If molding temperature is increased to produce thin and large-size light guide plates, then productivity is improved, but thermal stability and releasability deteriorate causing material degradation
Solution Approach 1:
The patent applies beforehand cushioning by incorporating stabilizers (0.01-5 wt%) into the resin composition before molding, which preemptively protect the aromatic polycarbonate resin from thermal degradation during high-temperature molding processes, allowing increased productivity without sacrificing thermal stability
Solution Approach 2:
The patent uses releasing agents (0.01-5 wt%) as intermediaries between the molten resin and the mold cavity, facilitating smooth ejection of thin light guide plates at high molding temperatures without causing material degradation or sticking, thereby improving productivity while maintaining thermal stability
Data Source
Figure 1~3
AI summary
There is provided an aromatic polycarbonate resin composition exhibiting excellent mechanical strength, transfer property, light transmittance, thermal stability and moldability which is capable of being molded into thin-wall products and large-size products, as well as a light guide plate produced from the resin composition. The present invention relates to an aromatic polycarbonate resin composition for light guide plates, comprising an aromatic polycarbonate resin having a viscosity-average molecular weight of 13,000 to 15,000, and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 1.5 to 2.7 in terms of polystyrene as measured by gel permeation chromatography; and a stabilizer and a releasing agent blended in the aromatic polycarbonate resin, as well as a light guide plate produced from the resin composition.