Reactive Silsesquioxane Fluorene Lens Composition
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Solution Overview
Problem
Conventional plastic lenses for high-resolution camera modules lack sufficient heat resistance and dimensional stability during high-temperature processes like solder reflow, and materials with improved refractive index often compromise on transparency and durability.
Innovation Solution
A polymerizable composition combining a reactive silsesquioxane compound obtained by polycondensation of alkoxy silicon compounds with a fluorene compound, which upon curing, provides a high refractive index, excellent heat resistance, and dimensional stability, suppressing cracking and maintaining optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional plastic lens materials are used, then manufacturing and optical properties are maintained, but heat resistance and dimensional stability during solder reflow process deteriorate
Solution Approach 1:
The patent employs a composite material system combining inorganic silsesquioxane units with organic polymer chains. The silsesquoxane segments provide thermal stability and structural rigidity, while the organic portions maintain flexibility and optical properties. This hybrid architecture enables the material to withstand solder reflow temperatures (up to 260°C) without cracking or dimensional changes, resolving the contradiction between heat resistance and reliability.
Solution Approach 2:
The patent modifies the chemical structure parameters of the polymer by incorporating specific silsesquioxane units with controlled molecular weights and crosslinking densities. By adjusting the ratio of inorganic to organic components and controlling the crosslinking degree, the material achieves optimal balance between heat resistance (withstanding 260°C reflow) and dimensional stability (maintaining shape without deformation), thereby resolving the technical contradiction.
2Temperature
If inorganic fine particles such as silica are increased to improve heat resistance, then heat resistance temperature rises, but transparency and refractive index control deteriorate
Solution Approach 1:
Instead of uniformly distributing inorganic particles throughout the matrix, the patent incorporates silsesquioxane units that form localized inorganic-rich domains within the organic polymer matrix. These nanoscale inorganic clusters provide heat resistance locally, while the continuous organic phase maintains overall transparency and optical homogeneity. This local quality approach allows achieving 260°C heat resistance without compromising optical clarity or refractive index control.
Solution Approach 2:
The silsesquioxane-based hybrid material exhibits a controlled porous or network structure at the nanoscale, where inorganic units form a three-dimensional framework with organic linkers. This porous architecture provides high surface area for thermal stability while maintaining light transmission through the material. The controlled porosity prevents particle coagulation that would otherwise scatter light and reduce transparency, thus resolving the contradiction between heat resistance and optical precision.
3Productivity
If liquid curable resin is used for pressing molding to improve productivity, then production efficiency increases, but heat resistance and crack resistance deteriorate
Solution Approach 1:
The patent replaces traditional thermoplastic injection molding with a photo-curing or thermally-curing liquid resin system. The liquid resin is molded in its fluid state and then cured in situ to form the final lens structure. This substitution of the molding mechanism allows for complex three-dimensional lens shapes to be formed directly without subsequent high-temperature processing, thereby maintaining the heat-resistant properties of the silsesquioxane-based material while achieving high production efficiency through direct molding.
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
The cured product exhibits high refractive index, heat resistance, and dimensional stability, making it suitable for high-resolution camera modules, with improved handling and molding capabilities without the need for solvents, ensuring reliability and performance in high-temperature processes.
Implementation Method 1
reactive silsesquoxane compound obtained by polycondensation of an alkoxy silicon compound A of Formula (1) with an alkoxy silicon compound B of Formula (2)
Implementation Method 2
polymerizable composition comprising (a) 100 parts by mass of reactive silsesquoxane compound... (b) 10 to 500 parts by mass of fluorene compound
Data Source
AI summary
A polymerizable composition that is suitable to produce a molded product that can suppress cracking and dimensional change caused by a high-temperature heat history with a high refractive index of a cured product maintained. A polymerizable composition including (a) 100 parts by mass of the specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of the specific fluorene compound, a cured product obtained by the polymerizable composition and a material for a high-refractive index resin lens including the polymerizable composition.