Polyester Carbonate Resin Composition for Stable Optical Lenses
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Solution Overview
Problem
Existing optical resins for lenses suffer from limitations in refractive index, Abbe number balance, heat resistance, birefringence, and dimensional stability, leading to performance issues in optical systems.
Innovation Solution
A polyester carbonate resin composition is developed using specific diol compounds and higher alcohol fatty acid esters, with defined structural units and molar ratios, to enhance properties such as dimensional change rate, water absorption, haze, and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a high refractive index resin is used, then lens size and weight are reduced, but chromatic aberration correction becomes more difficult
Solution Approach 1:
The patent uses a composite lens system combining a negative lens made of cycloolefin polymer (high Abbe number 55-60) and a positive lens made of polycarbonate resin (low Abbe number 25-35). This composite structure enables effective chromatic aberration correction while maintaining the high refractive index benefits for compact lens design.
2Temperature
If polycarbonate resin consisting of bisphenol A is used, then heat resistance is improved, but birefringence increases
Solution Approach 1:
The patent specifies precise parameter ranges for the polycarbonate resin: glass transition temperature of 140-160°C and Abbe number of 25-35. By controlling these parameters, the resin achieves adequate heat resistance while minimizing birefringence effects in the optical lens.
3Reliability
If cycloolefin polymer is used, then Abbe number is improved, but heat resistance decreases
Solution Approach 1:
The patent divides the optical lens into two segments with different material properties: a negative lens segment made of cycloolefin polymer (optimizing Abbe number 55-60) and a positive lens segment made of polycarbonate resin (optimizing heat resistance with Tg 140-160°C). This segmentation allows each segment to excel in its respective optical function.
4Reliability
If polyester carbonate resin with high refractive index is used, then lens power is improved, but dimensional stability deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for the polyester carbonate resin: glass transition temperature of 80-100°C, refractive index of 1.53-1.57, and Abbe number of 30-38. By controlling these parameters, the resin achieves high refractive index for adequate lens power while maintaining acceptable dimensional stability through proper molecular structure design.
Data Source
AI summary
The present invention makes it possible to provide a polyester carbonate resin composition characterized by including: a polyester carbonate resin including a structural unit (A) that is represented by general formula (1), a structural unit (B) that is derived from at least one compound selected from the group consisting of 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,10-decanediol, and 1,12-dodecanediol (C12-diol), and a structural unit (i) that is derived from a dicarboxylic acid or a carboxylic acid diester represented by general formula (I); and a higher alcohol fatty acid ester.