Polycarbonate Light Guide Plate Resolving Heat-Optical Trade-off
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Solution Overview
Problem
Conventional light guide plates made from thermoplastic resins, such as polymethylmethacrylate and aromatic polycarbonate, face issues with heat resistance, mechanical characteristics, electrical characteristics, and poor light transmittance and color uniformity, while attempts to improve light transmittance, like using copolyestercarbonate, compromise heat resistance.
Innovation Solution
A terminally modified polyoxyalkylene glycol is introduced, represented by a specific formula, which improves transmittance, color uniformity, and machinability when applied to a polycarbonate resin composition, enhancing the properties of the resulting light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aromatic polycarbonate resin is used for light guide plate, then heat resistance and mechanical characteristics are improved, but light transmittance and color uniformity deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of aliphatic polycarbonate resin as the base material and cyclic carbonate compound as an additive. This combination allows the base resin to provide heat resistance while the additive improves light transmittance and color uniformity, resolving the contradiction between heat resistance and optical properties
Solution Approach 2:
The patent changes the chemical composition parameters by introducing cyclic carbonate compounds with specific molecular structures (containing carbonate groups) into the polycarbonate resin system. This parameter modification enables the material to simultaneously achieve high heat resistance and improved light transmittance without sacrificing the thermal properties of the base resin
2Illumination intensity
If copolyestercarbonate is used to improve light transmittance, then light transmittance is improved, but heat resistance deteriorates
Solution Approach 1:
The patent extracts and eliminates the ester linkage components from the copolyestercarbonate structure, using only cyclic carbonate compounds containing carbonate groups as additives in the aliphatic polycarbonate resin system. This extraction of the problematic ester component prevents heat resistance deterioration while maintaining the light transmittance benefits
Solution Approach 2:
The patent modifies the chemical structure parameters by selecting cyclic carbonate compounds with specific molecular weights (500-5000) and structural characteristics, changing the composition parameters to achieve both high light transmittance and maintained heat resistance, avoiding the heat resistance loss associated with copolyestercarbonate
3Illumination intensity
If polymethylmethacrylate resin is used for light guide plate, then light transmittance is improved, but heat resistance deteriorates
Solution Approach 1:
The patent creates a composite material system where aliphatic polycarbonate resin provides the heat resistance framework and cyclic carbonate compounds enhance the optical properties. This composite approach allows simultaneous achievement of high light transmittance and heat resistance, overcoming the limitations of pure polymethylmethacrylate resin
Data Source
AI summary
Disclosed are a terminally modified polyoxyalkylene glycol which may dramatically improve color uniformity and machinability, when applied to a polycarbonate resin transmittance, a polycarbonate resin composition comprising the same, and a light guide plate manufactured using the same.