Core-Shell Nanoparticles for Photochromic Lens Compatibility
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Solution Overview
Problem
The integration of photochromic dyes into polymeric substrates for optical articles is challenging due to matrix compatibility issues, leading to performance reductions, and existing encapsulation methods complicate manufacturing and may damage the dyes, especially in ophthalmic lenses requiring high transparency and mechanical strength.
Innovation Solution
The development of core-shell nanoparticles with a mineral shell, where the photochromic compound is encapsulated in a nanoparticle core formed during polymerization, which is then dispersed in a transparent polymer matrix, ensuring chemical protection and compatibility without altering the optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If photochromic dyes are directly embedded in polymeric substrate, then manufacturing process is simplified, but matrix compatibility issues arise leading to performance reduction
Solution Approach 1:
The patent introduces a compatibilizer as an intermediary substance between the photochromic dye and the polymeric substrate. The compatibilizer has dual affinity: it interacts with both the dye molecules and the polymer matrix, thereby improving dispersion and stability of the dye within the substrate without requiring complex manufacturing processes. This resolves the contradiction by maintaining manufacturing simplicity while enhancing dye performance through the mediating作用 of the compatibilizer.
2Reliability
If encapsulation methods are used to protect photochromic dyes, then chemical protection is provided, but manufacturing process becomes complex and may damage dyes
Solution Approach 1:
The patent extracts the protective function from complex encapsulation structures and concentrates it into a small-molecule compatibilizer. Instead of using multi-layer encapsulation shells or complex nanoparticle structures, the compatibilizer provides the necessary chemical protection and stabilization through molecular-level interactions. This extracts the essential protective function while eliminating the manufacturing complexity associated with traditional encapsulation methods.
3Reliability
If matrix is designed for optimal dye performance with extended linear domains, then dye compatibility improves, but thermo-mechanical performance of substrate decreases
Solution Approach 1:
The patent applies local quality by concentrating the compatibility-enhancing features in the compatibilizer molecules rather than requiring the entire polymer matrix to have extended linear domains. The compatibilizer provides localized interaction zones that facilitate dye compatibility, while the bulk polymer matrix maintains its original thermo-mechanical properties. This resolves the contradiction by providing dye compatibility locally through the compatibilizer without compromising the overall structural performance of the substrate.
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
This approach simplifies the manufacturing process, maintains the integrity of the photochromic compound, and provides a transparent polymer matrix with enhanced mechanical properties, allowing for controlled stabilization and distribution of photochromic agents, thus addressing the challenges of matrix compatibility and performance.
Implementation Method 1
The core of core shell nanoparticles results from polymerization of a composition comprising nanoparticle core precursors and at least one photochromic compound
Implementation Method 2
a given photochromic dye is to be combined with a preexisting technology
Data Source
AI summary
An ophthalmic lens comprising a transparent polymer matrix and core shell nanoparticles which are dispersed in the transparent polymer matrix, wherein the core of core shell nanoparticles results from polymerization of a composition comprising nanoparticle core precursors and at least one photochromic compound, and the shell of core shell nanoparticles comprises a mineral compound.