Ink Composition Adhesion and Curing for Display Devices
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Solution Overview
Problem
Conventional ink compositions for forming light-shielding materials in image display apparatuses lack sufficient substrate adhesion and face challenges in curing due to their inherent light-shielding properties, which hinder long-term use.
Innovation Solution
An ink composition comprising a light-shielding agent, a cationic polymerizable compound with a metallic element-containing compound, a photoacid generator, and a sensitizer, specifically formulated to balance substrate adhesion and light-shielding properties while maintaining curability, with volume concentrations and content ratios optimized for effective curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional ink compositions are used to form light-shielding materials, then light-shielding property is achieved, but substrate adhesion is insufficient
Solution Approach 1:
The patent uses a composite ink composition containing multiple components: a cationic polymerizable compound (base resin), a metallic element-containing compound (adhesion promoter with elements like Si, Al, Ti, Zr, Sn), a photoacid generator, and a sensitizer. This composite formulation achieves both strong substrate adhesion through the metallic element-containing compound and effective light-shielding through the optimized concentration of light-shielding agent (0.3-12% volume concentration), resolving the contradiction between adhesion and light-shielding properties.
2Object-affected harmful factors
If ink compositions with high light-shielding content are used, then light-shielding property is improved, but curability is hindered
Solution Approach 1:
The patent optimizes the concentration parameter of the light-shielding agent to be within 0.3-12% volume concentration relative to total solid content. This parameter optimization ensures sufficient light-shielding property while maintaining adequate light transmission for effective photocuring. Additionally, the inclusion of a sensitizer extends the absorption spectrum of the photoacid generator, enabling curing across a broader wavelength range and improving overall curability despite the presence of light-shielding agents.
3Duration of action of stationary object
If light-shielding materials are formed for long-term use, then durability is improved, but substrate adhesion must be enhanced
Solution Approach 1:
The metallic element-containing compound acts as an intermediary substance that bridges the ink composition and the substrate. These compounds (containing elements such as Si, Al, Ti, Zr, or Sn) form strong chemical bonds with both the substrate surface and the polymerizable compound, creating a robust interface that ensures long-term durability and resistance to peeling or delamination over extended service periods.
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 ink composition achieves a cured product with excellent substrate adhesion and light-shielding properties, ensuring stable performance over time in image display apparatuses, particularly in mitigating light interference between adjacent light-emitting devices.
Implementation Method 1
The ink composition contains a light-shielding agent (A); a cationic polymerizable compound (B); a photoacid generator (C); and a sensitizer (D)... curing of such ink compositions with light is hard to proceed
Data Source
AI summary
An ink composition contains a light-blocking agent (A), a cationically polymerizable compound (B), a photoacid generator (C) and a sensitizer (D). The volume concentration of the light-blocking agent (A) with respect to the total volume of solids in the ink composition is 0.3% to 12%. The cationically polymerizable compound (B) contains a metal element-containing compound (B1) that has a cationically polymerizable group and a hydrolyzable group. The content of the metal element-containing compound (B1) is 5 parts by mass to 80 parts by mass if all the solids in the ink composition are taken as 100 parts by mass. The sensitizer (D) contains a compound (D1) that has an anthracene skeleton.