Fluorene-Based Polycarbonate Resin for Clear Optical Molding
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Solution Overview
Problem
Existing polycarbonate resins have low refractive indices and poor heat stability when blended with sulfur-containing compounds, leading to decreased transparency and compatibility issues.
Innovation Solution
A compound represented by Formula (1) is polymerized to produce a polycarbonate resin with high refractive index and excellent transparency, using specific aromatic groups and reaction conditions to enhance heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a sulfur-containing compound is blended with fluorene-containing polyester to improve refractive index, then refractive index is improved, but heat stability is lowered and transparency may decrease
Solution Approach 1:
The invention changes the chemical structure parameters of the polyester by introducing specific aromatic diol components with fluorene rings and controlling the ratio of aromatic diol to dicarboxylic acid (0.3-2.0 mol/mol) to achieve high refractive index while maintaining heat stability. This resolves the contradiction by optimizing molecular structure rather than simple blending.
Solution Approach 2:
The invention creates a composite polyester structure combining fluorene-containing aromatic diol with specific dicarboxylic acids (terephthalic acid, isophthalic acid, or 2,6-naphthalenedicarboxylic acid) to achieve both high refractive index and heat stability, avoiding the problems of simple blending approaches.
2Illumination intensity
If sulfur-containing compound is blended with fluorene-containing polyester to improve refractive index, then refractive index is improved, but compatibility of components is poor leading to decreased transparency
Solution Approach 1:
The invention achieves homogeneous integration of fluorene-containing aromatic diol with dicarboxylic acid components through controlled polycondensation, ensuring uniform molecular distribution and excellent transparency while maintaining high refractive index, eliminating phase separation issues of blending methods.
3Reliability
If optical glass is used for optical lens, then heat resistance, transparency, dimensional stability, and chemical resistance are excellent, but material cost is high, molding processability is poor, and productivity is low
Solution Approach 1:
The invention replaces expensive optical glass with a cost-effective polyester resin that can be processed by injection molding, achieving mass production capability while maintaining excellent heat resistance and optical properties through carefully selected aromatic diol and dicarboxylic acid components.
Solution Approach 2:
The invention changes the material from inorganic glass to organic polyester by controlling the molecular structure through specific monomer selection, enabling injection molding processing while maintaining heat resistance through the aromatic fluorene structure and optimized composition ratios.
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 resulting polycarbonate resin achieves high refractive index and transparency, suitable for optical molded articles, with improved heat resistance and moldability.
Implementation Method 1
a resin obtained by polymerization of the compound
Data Source
AI summary
Provided is a compound represented by General Formula (1) in General Formula (1), Ar1 and Ar2 independently represent a group selected from the following Formulae, where, R1 to R6 each represent a hydrogen atom, a hydrocarbon group, or a heteroatom-containing hydrocarbon group, A1 to A5 and B1 to B5 each represent a hydrogen atom, a hydrocarbon group, or a heteroatom-containing hydrocarbon group, at least one of A1 to A5 is a -Y1-Ar3 group, at least one of B1 to B5 is a -Y2-Ar4 group, Y1 and Y2 each represent a single bond or a linking group, Ar3 and Ar4 each represent an aromatic group, X1 to X4 each are -O-, -S-, -NR'-, or -C(Me)2-, Z1 to Z4 each represent a hydrocarbon atom, a hydrocarbon group, or a heteroatom-containing hydrocarbon group, R' represents a hydrogen atom, a hydrocarbon group, or a heteroatom-containing hydrocarbon group, and o and p each represent an integer of 1 to 4.