Triazine Ring Polymer for High Refractive Index Thin Films
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Solution Overview
Problem
Existing materials used in electronic device applications, such as liquid-crystal displays and touch panels, are inadequate in terms of refractive index, particularly for forming fine patterns and maintaining transparency, with most having a refractive index below 1.7, which limits their suitability for high-definition displays and transparent electrode visibility.
Innovation Solution
A triazine ring-containing polymer with arylamino groups on side chains and carboxyl groups on the main or side chains is developed, allowing for the formation of thin films with high refractive index and transparency, enabling the creation of fine patterns through masking, light exposure, and curing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If existing materials with refractive index below 1.7 are used, then transparency is maintained, but the refractive index is insufficient for high-definition displays and transparent electrode visibility
Solution Approach 1:
The patent modifies the chemical structure of the polymer by introducing specific aromatic rings (naphthalene, anthracene, phenanthrene) and heterocyclic groups into the recurring units, thereby changing the optical parameters to achieve a refractive index of 1.7 or higher while maintaining fine pattern formability through the polymer's molecular design
Solution Approach 2:
The patent creates a composite polymer structure combining triazine rings with aromatic rings and heterocyclic groups in specific recurring units, achieving a synergistic effect that simultaneously provides high refractive index and excellent fine pattern formability that neither component could achieve alone
2Volume of stationary object
If the refractive index is increased above 1.7, then visibility in touch panels is improved, but transparency is compromised
Solution Approach 1:
The patent optimizes the chemical composition of the polymer by selecting specific aromatic rings and heterocyclic groups with appropriate electron densities and molecular polarizabilities, achieving a refractive index of 1.7 or higher while maintaining high transparency through careful control of the polymer's optical parameters
Solution Approach 2:
The patent introduces specific functional groups and aromatic structures at strategic positions within the polymer chain to locally enhance the refractive index while maintaining overall transparency, allowing different regions of the polymer structure to contribute differently to the optical properties
3Ease of manufacture
If polymer structures are simplified for ease of manufacture, then production is easier, but fine pattern formability is reduced
Solution Approach 1:
The patent designs recurring units with specific molecular weights, functional group distributions, and chain architectures that balance ease of polymerization with the ability to form fine patterns, optimizing the chemical parameters to achieve both manufacturability and precision
Solution Approach 2:
The patent divides the polymer structure into distinct recurring units with specific functions, allowing each segment to contribute to either ease of manufacture or fine pattern formability, with the overall polymer achieving both properties through the coordinated arrangement of these segments
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 polymer achieves high refractive index and transparency, enabling its use in electronic devices like liquid-crystal displays, touch panels, and organic EL displays, improving visibility and durability by forming thin films with high heat resistance and low volume shrinkage.
Implementation Method 1
polymers containing recurring units which have a triazine ring and an aromatic ring possess a high refractive index and are able, with the polymer alone, to achieve a high heat resistance, high transparency, high refractive index
Implementation Method 2
a crosslinking agent and/or a photocuring catalyst may be used in combination with the triazine ring-containing polymer of the invention
Data Source
AI summary
It is possible to obtain a thin film that can form a minute pattern and that has a high index of refraction by using a polymer containing a triazine ring and containing a repeating unit structure represented for example by formula (22) or (26).