Photopolymerizable Composition for Optical Members with High Refractive Index
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Solution Overview
Problem
Existing photopolymerizable compositions for forming optical members with high refractive index and low haze face challenges such as limited refractive index range, increased viscosity, decreased processability, and UV stability issues, along with surface curing problems due to oxygen inhibition, which result in higher production costs and reduced light transmittance.
Innovation Solution
A photopolymerizable composition comprising olefinic monomers with photocurable functional groups, metal oxide particles, and an amine compound with both an amine group and a photocurable functional group, which allows for crosslinking and improved surface curing even in air, reducing the need for inert atmospheres and enhancing optical properties like light transmittance and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the refractive index of the resin is increased to improve luminance increase rate, then the luminance increase rate increases, but the viscosity of the monomer composition increases and processability decreases
Solution Approach 1:
The patent uses a composite monomer system comprising multiple types of monomers (cyclic carbonate monomer, cyclic carboxylate monomer, and chain-type carbonate monomer) with different molecular structures and properties. This composite approach allows achieving high refractive index (1.55-1.65) while maintaining low viscosity and good processability, as each monomer component contributes differently to the overall optical and rheological properties of the composition
Solution Approach 2:
The patent systematically adjusts the compositional ratios of different monomers to optimize both refractive index and viscosity. By changing the parameters of monomer selection and their relative amounts, the invention achieves the desired balance between optical performance (high refractive index) and manufacturing ease (low viscosity, good processability)
2Illumination intensity
If the refractive index of the resin is increased to improve luminance increase rate, then the luminance increase rate increases, but UV stability decreases
Solution Approach 1:
The patent employs a composite monomer system where cyclic carbonate monomers and cyclic carboxylate monomers are combined with chain-type carbonate monomers. This composite structure provides both high refractive index and excellent UV stability, as the cyclic structures in the monomers contribute to photostability while maintaining the desired optical properties
Solution Approach 2:
The patent optimizes the compositional parameters to achieve UV stability alongside high refractive index. By carefully selecting and ratioing monomers with different UV resistance characteristics, the invention maintains reliability under UV exposure while achieving the required optical performance for luminance enhancement
3Ease of manufacture
If surface curing is performed in air atmosphere, then production cost is reduced, but surface curing is insufficient due to oxygen inhibition, resulting in increased haze and reduced light transmittance
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating specific monomers (cyclic carbonate monomers and cyclic carboxylate monomers) that are less susceptible to oxygen inhibition. This compositional change enables effective surface curing in air atmosphere, achieving both cost reduction (by avoiding inert gas) and maintaining high surface curing quality with low haze and excellent light transmittance
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 a high refractive index, low haze, and excellent light transmittance while maintaining processability and reducing production costs, contributing to improved display device characteristics.
Implementation Method 1
a photopolymerization initiator
Implementation Method 2
by the action of the amine compound contained in the photopolymerizable composition, the problem of reduced surface curability due to the influence of oxygen can be greatly reduced
Implementation Method 3
metal oxide particles...enables the formation of a cured film satisfying a high refractive index
Data Source
AI summary
The present disclosure relates to a photopolymerizable composition which enables the formation of an optical member that exhibits improved optical properties, including excellent light transmittance, low haze, and high refractive index, an optical member and a display device formed therefrom. The photopolymerizable composition includes at least one olefinic monomer having a photocurable functional group, metal oxide particles, an amine compound having an amine group and a photocurable functional group, and a photopolymerization initiator.