Optical Thermoplastic Resin Composition for Refractive Index-Abbe Balance
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Solution Overview
Problem
Conventional thermoplastic resins, such as polysiloxane polymers, do not easily achieve a balance of high refractive index and Abbe number, which are crucial for optical applications.
Innovation Solution
A thermoplastic resin comprising a silane constituent unit with polycyclic aryl groups and a dihydroxy compound-derived diol constituent unit, where the polycyclic aryl group constitutes at least 30% by mol of the silane units, and specific ratios of fluorene and dinaphthalene constituent units are used to optimize refractive index and Abbe number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermoplastic resins such as polysiloxane polymers are used, then the material is available and processable, but the refractive index and Abbe number cannot be simultaneously optimized for optical applications
Solution Approach 1:
The patent employs composite materials by combining silane constituent units with polycyclic aryl groups (naphthyl, phenanthrenyl, anthryl, pyrenyl groups) and diol constituent units in specific molecular architectures. This composite structure enables simultaneous achievement of high refractive index (1.600-1.730) and appropriate Abbe number (15.0-27.0), resolving the contradiction between optical performance and property balance that plagues conventional polysiloxane polymers.
Solution Approach 2:
The patent applies parameter changes by systematically varying the types and proportions of polycyclic aryl groups (naphthyl, phenanthrenyl, anthryl, pyrenyl) in the silane constituent units, and adjusting the diol constituent unit composition. By changing these molecular parameters within specific ranges, the resin achieves optimized refractive index and Abbe number simultaneously, overcoming the limitation of conventional thermoplastic resins where improving one parameter deteriorates the other.
2Illumination intensity
If thermoplastic resins with high refractive index are designed, then the refractive index is improved, but the Abbe number tends to decrease
Solution Approach 1:
The patent applies local quality by incorporating specific polycyclic aryl groups (naphthyl, phenanthrenyl, anthryl, pyrenyl) at specific positions and proportions in the molecular structure. The silane constituent units with these polycyclic groups are arranged in specific compositions (with diol constituent units) to create local structural characteristics that simultaneously enhance refractive index while maintaining appropriate Abbe number, breaking the inverse relationship observed in conventional resins.
Solution Approach 2:
The patent resolves the refractive index-Abbe number trade-off by changing molecular parameters: introducing polycyclic aryl groups with specific carbon atom counts (10-30 atoms), adjusting their proportions (30% by mol or more of silane units), and selecting specific diol constituent units. These parameter changes enable independent optimization of both refractive index and Abbe number, eliminating the inverse relationship that constrains conventional thermoplastic resins.
Data Source
AI summary
Provided are a thermoplastic resin excellent in terms of properties for optical uses, such as refractive index and chromatic aberration, and a molded article including such thermoplastic resin. This thermoplastic resin has: a silane constituent unit (S) which is a constituent unit represented by general formula (1) and is the —OSi(R1R2)O— moiety; and a diol constituent unit (A) derived from a dihydroxy compound and is represented by M. (In general formula (1), R1 and/or R2 represents an optionally substituted C10-C30 polycyclic aryl group.)