Polyester Carbonate Resin for Optical Components
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Solution Overview
Problem
Existing optical materials, such as polycarbonate copolymers with a perhydroxydimethanonaphthalene skeleton, have limitations in strength and optical properties, while high Abbe number polycarbonate resins face challenges in moldability and productivity.
Innovation Solution
A polyester carbonate resin with specific constituent units, including a combination of constituent units (I), (II), and (III), is developed, offering improved glass transition temperature, moldability, and optical properties like low specific gravity and reduced photoelastic coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polycarbonate copolymer with perhydroxydimethanonaphthalene skeleton is used, then optical transparency is achieved, but strength is reduced due to low position of dihydroxymethyl group
Solution Approach 1:
The patent changes the chemical structure parameters by introducing constituent unit (I) with specific R1-R3 groups (hydrogen, methyl, or ethyl) at defined positions, which modifies the molecular arrangement to enhance strength while preserving optical properties through controlled structural parameters
Solution Approach 2:
The patent creates a composite resin system by combining multiple constituent units (I), (II), and (III) in specific ratios, where unit (I) provides strength enhancement while units (II) and (III) maintain optical transparency, achieving a balance between mechanical and optical properties
2Reliability
If polycarbonate resin with high Abbe number is used, then optical dispersion is improved, but moldability and productivity are reduced
Solution Approach 1:
The patent adjusts the chemical composition parameters by controlling the ratio of constituent units (I)/(II) and the specific R1-R3 groups, which modifies the resin's processing characteristics to improve moldability while maintaining high Abbe number through controlled molecular structure
Solution Approach 2:
The patent introduces local structural variations through different R1-R3 configurations in constituent unit (I), which locally enhances optical properties in specific regions of the polymer chain while maintaining overall processability through the balanced composition of all three constituent units
3Reliability
If conventional optical materials are used, then optical clarity is achieved, but material cost increases and productivity decreases
Solution Approach 1:
The patent optimizes the molecular weight distribution and composition ratios of constituent units to achieve optimal balance between optical clarity and processing speed, enabling faster production cycles while maintaining high optical quality through controlled polymerization parameters
Solution Approach 2:
The patent creates a simplified molecular structure model with three constituent units that replicates the essential optical properties of expensive optical glasses at lower cost, achieving cost reduction while maintaining productivity through easier processing characteristics
Data Source
AI summary
Provided is a polyester carbonate resin having a constituent unit (I) represented by the following general formula (1), a constituent unit (II) represented by the following general formula (2), and a constituent unit (III) represented by the following general formula (3):wherein, in the above formula (1), R1 to R3 each independently represent a hydrogen atom, a methyl group or an ethyl group, and in the above formula (2), Q represents a divalent linking group.