Polycarbonate Resin Composition for Light Guide Plates
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Solution Overview
Problem
Polycarbonate resin compositions used in light guide plates for liquid crystal display devices suffer from lower light transmittance compared to PMMA, leading to reduced brightness, and existing resin compositions fail to meet the requirements for modern light guide plates.
Innovation Solution
A polycarbonate resin composition incorporating a tetramethylene glycol derivative and a phosphite compound, specifically formulated to maintain heat resistance and mechanical strength while enhancing light transmittance, is developed. The composition includes a polycarbonate resin, a tetramethylene glycol derivative represented by the formula HO(C4H8O)m(C3H6O)nH, and a phosphite compound, with specific weight ratios to achieve high light transmittance and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polycarbonate resin is used as light guide plate material, then heat resistance and mechanical strength are improved, but light transmittance deteriorates
Solution Approach 1:
The patent uses a composite resin composition containing polycarbonate resin (A), tetramethylene glycol derivative (B), and phosphite compound (C). This composite approach combines the heat resistance and mechanical strength of polycarbonate with additives that improve light transmittance, achieving both durability and optical performance in the light guide plate.
2Temperature
If polycarbonate resin is used as light guide plate material, then heat resistance is improved, but light transmittance deteriorates
Solution Approach 1:
The patent uses a composite resin composition containing polycarbonate resin (A), tetramethylene glycol derivative (B), and phosphite compound (C). This composite approach combines the heat resistance and mechanical strength of polycarbonate with additives that improve light transmittance, achieving both durability and optical performance in the light guide plate.
3Productivity
If high temperature molding is performed, then productivity is improved, but hue stability deteriorates
Solution Approach 1:
The patent incorporates phosphite compound (C) as a stabilizer in the resin composition before molding. This preliminary action prevents oxidation and degradation during high-temperature molding, maintaining hue stability even when high productivity molding conditions are used.
Solution Approach 2:
The patent optimizes the chemical composition parameters by adding tetramethylene glycol derivative (B) and phosphite compound (C) in specific amounts (0.005-5.0 parts by weight per 100 parts of polycarbonate resin). These parameter changes enable the material to maintain stability under high-temperature molding conditions while allowing high productivity processing.
4Illumination intensity
If light transmittance is improved by adding materials, then brightness is improved, but mechanical properties may deteriorate
Solution Approach 1:
The patent optimizes the composition parameters by adding tetramethylene glycol derivative (B) and phosphite compound (C) in specific small amounts (0.005-5.0 parts by weight per 100 parts of polycarbonate resin). This controlled parameter change improves light transmittance and brightness while maintaining the mechanical strength inherent to polycarbonate resin.
Data Source
AI summary
A polycarbonate resin composition includes: a polycarbonate resin (A); a tetramethylene glycol derivative (B) represented by general formula (1): HO(C4H8O)m(C3H6O)nH (wherein m and n independently represent an integer of 4 to 60, and m + n represents an integer of 20 to 90); and a phosphite compound (C), an amount of the tetramethylene glycol derivative (B) is 0.005 to 5.0 parts by weight per 100 parts by weight of the polycarbonate resin (A), and an amount of the phosphite compound (C) is 0.005 to 5.0 parts by weight per 100 parts by weight of the polycarbonate resin (A). An optical molded article is obtained by molding the polycarbonate resin composition.