Phase-Separated Optical Film for Stable Light Scattering
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Solution Overview
Problem
Existing compositions with high-refractive-index particles face challenges in achieving both storage stability and effective light scattering properties due to particle settling and high visible light transmittance, limiting their ability to block visible light effectively.
Innovation Solution
A composition comprising particles with a refractive index of 2.0 or more and an average primary particle diameter of 200 nm or less, combined with a film-forming component including multiple resins or resin and polymerizable monomers, which forms a phase-separated structure upon heating, reducing light transmittance and enhancing light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particles with large particle size and high refractive index are used to improve light scattering properties, then light scattering properties are improved, but particles settle during storage due to large specific gravity
Solution Approach 1:
The patent changes the particle size parameter to 200 nm or less while maintaining high refractive index (2.0 or more), transforming the particles from a settling-prone state to a suspension-stable state through nanoscale reduction
Solution Approach 2:
The patent creates a composite system combining ultrafine high-refractive-index particles with specifically selected resin components that provide both dispersion stability and phase separation capability, achieving simultaneous storage stability and light scattering function
2Reliability
If a light scattering sheet with high visible light transmittance is used, then light scattering properties are improved, but it cannot effectively block visible light
Solution Approach 1:
The patent optimizes the particle concentration and size distribution parameters to achieve a balance where light scattering is maximized while visible light transmittance is reduced to 80% or less, enabling effective light blocking
Solution Approach 2:
The patent creates a phase-separated structure where particles are concentrated in specific phases, creating local regions of high light scattering density that effectively block visible light while maintaining overall film functionality
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 composition achieves good storage stability and excellent light scattering properties by preventing particle settling and optimizing light transmission, allowing for efficient light scattering and reduced angle dependence.
Implementation Method 1
a film which appropriately blocks visible light and has high light scattering properties
Implementation Method 2
particles having a refractive index of 2.0 or more
Data Source
Figure 1~2
AI summary
Provided are a composition including particles having a refractive index of 2.0 or more and an average primary particle diameter of 200 nm or less, a film-forming component including at least one selected from a resin or a polymerizable monomer, and a solvent, in which the film-forming component includes two or more kinds of resins, or includes one or more kinds of resins and one or more kinds of polymerizable monomers, and in a case where a film having a thickness of 4 µm is formed by heating the composition at 200°C for 5 minutes, a maximum value of a light transmittance of the film in a wavelength range of 400 to 1000 nm is 80% or less, and a phase-separated structure between a first phase including the particles and a second phase with a lower content of the particles than the first phase is formed in the film; a film formed of the composition; and an optical sensor.