Ink-Jet Coating Composition for High-Refractive-Index Films
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Solution Overview
Problem
Ink-jet coating technologies face challenges with solvents eroding the coater head and limitations in viscosity and surface tension, which hinder the formation of high-refractive-index films with desired properties for electronic devices.
Innovation Solution
A film-forming composition using a triazine ring-containing polymer dissolved in a glycol dialkyl ether-type solvent with a high proportion, combined with glycol monoalkyl ether-type and glycol-type solvents, to achieve stable droplet ejection and high-refractive-index film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic solvents are used in ink-jet coating, then high refractive index and transparency can be achieved, but the coater head is eroded and droplet ejection is unstable
Solution Approach 1:
The patent changes the chemical composition parameters of the solvent system by incorporating glycol dialkyl ether-type solvents (more than 50 wt%) and glycol monoalkyl ether-type solvents in specific proportions. This parameter modification allows the solvent to dissolve the triazine ring-containing polymer while being gentle enough on the coater head, thus resolving the contradiction between achieving high refractive index films and preventing head erosion
Solution Approach 2:
The patent creates a composite solvent system combining multiple glycol ether-type solvents (glycol dialkyl ether-type + glycol monoalkyl ether-type) with a triazine ring-containing polymer. This composite formulation achieves both the desired film properties (high refractive index, transparency) and compatibility with ink-jet coating equipment, eliminating the harmful erosion effect while maintaining film quality
2Reliability
If composition viscosity and surface tension are adjusted for stable droplet ejection, then coating reliability improves, but film formation quality may be compromised
Solution Approach 1:
The patent optimizes the viscosity and surface tension parameters of the composition by carefully controlling the ratio of glycol dialkyl ether-type solvent to glycol monoalkyl ether-type solvent. This parameter adjustment ensures stable droplet ejection from the ink-jet head while simultaneously achieving high-quality film formation with high refractive index and transparency, resolving the contradiction between ejection stability and film quality
3Object-affected harmful factors
If high proportion of glycol dialkyl ether-type solvent is used, then coater head erosion is prevented, but polymer solubility may be reduced
Solution Approach 1:
The patent creates a composite solvent system where glycol dialkyl ether-type solvent (more than 50 wt%) is combined with glycol monoalkyl ether-type solvent in specific proportions. This composite formulation maintains excellent polymer solubility while using a high proportion of the gentler glycol dialkyl ether-type solvent, thus preventing head erosion without sacrificing solubility
Solution Approach 2:
The glycol monoalkyl ether-type solvent acts as an intermediary that enhances the overall solvating power of the mixture. By adding this intermediary component, the system can use a high proportion of glycol dialkyl ether-type solvent (which prevents head erosion) while still achieving complete polymer dissolution through the synergistic effect of the combined solvents
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 prevents coater head erosion, enables effective droplet ejection, and produces films with high heat resistance, refractive index, and low volume shrinkage, suitable for electronic devices and optical materials.
Implementation Method 1
by using, as the solvent for dissolving a triazine ring-containing polymer, an organic solvent that contains a given proportion of a glycol dialkyl ether-type solvent
Data Source
AI summary
A film-forming composition for ink-jet coating which comprises: a triazine-ring-containing polymer including, for example, the repeating unit structure represented by the following formula [3]; and an organic solvent comprising more than 50 mass % solvent based on a glycol dialkyl ether. The composition is less apt to corrode the heads of ink-jet coating devices, and droplets thereof are satisfactorily ejected in ink-jet coating. Therefore, with the composition, it is possible to easily produce a high-refractive-index film according to a desired pattern through pattern printing by an ink-jet coating device.