Cyclic Olefin Copolymer Optical Component High Temperature Stability
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Solution Overview
Problem
Optical components made from cyclic olefin-based copolymers experience a change in refractive index and deterioration of optical performance when exposed to high temperature environments for extended periods.
Innovation Solution
An optical component comprising a cyclic olefin-based copolymer with specific constitutional units derived from olefins, cyclic olefins, and a controlled content ratio, which maintains a high refractive index and prevents refractive index changes even in high temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic olefin-based copolymer is used for optical components, then excellent optical properties and mechanical properties are achieved, but the refractive index changes and optical performance deteriorates upon exposure to high temperature environments for long periods
Solution Approach 1:
The invention changes the chemical composition parameters of the copolymer by controlling the content of constitutional units derived from specific cyclic olefins (Formula II and Formula III) and olefins (Formula I). By adjusting these compositional parameters to specific ranges, the patent achieves both high refractive index and resistance to refractive index changes under high temperature conditions.
Solution Approach 2:
The invention creates a composite copolymer structure combining multiple types of constitutional units: cyclic olefin units (Formula II) for high refractive index, additional cyclic olefin units (Formula III) for heat resistance, and olefin units (Formula I) for mechanical properties. This composite approach allows the material to simultaneously achieve optical performance, heat resistance, and stability.
2Strength
If the content of constitutional unit (a) derived from olefin is increased, then mechanical properties are improved, but refractive index and optical performance deteriorate
Solution Approach 1:
The invention optimizes the parameter of constitutional unit (a) content to be within a specific range (5-50 mol%). This parameter control ensures that mechanical properties are maintained through adequate olefin content while optical performance is preserved by limiting excessive olefin content that would reduce refractive index.
Solution Approach 2:
The invention assigns different functional roles to different constitutional units within the copolymer: cyclic olefin units (Formula II) primarily contribute to high refractive index, while olefin units (Formula I) contribute to mechanical properties. This functional differentiation allows each component to optimize its local contribution without compromising the other.
3Temperature
If the glass transition point is increased to improve heat resistance, then stability in high temperature environments is improved, but processing difficulty may increase
Solution Approach 1:
The invention adjusts the glass transition point parameter to a specific range (105°C to 165°C) through compositional control. This optimized parameter range achieves sufficient heat resistance for high temperature applications while maintaining processability during manufacturing, avoiding the trade-off between heat resistance and ease of manufacture.
Data Source
AI summary
Provided is an optical component including a cyclic olefin-based copolymer (A), in which the cyclic olefin-based copolymer (A) has a constitutional unit (a) derived from at least one olefin represented by the following general formula (I), a constitutional unit (b) derived from at least one cyclic olefin represented by the following general formula (II), and a constitutional unit (c) derived from at least one cyclic olefin represented by the following general formula (III), and the content of the constitutional unit (a) is equal to or less than 50 mol % in a case where the total content of the constitutional unit (a), the constitutional unit (b), and the constitutional unit (c) is taken as 100 mol %.