Polysilsesquioxane Hard Coat Layer Adhesion
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Solution Overview
Problem
Existing laminates for outdoor use face issues with adhesion between the hard coat layer and the anti-reflection layer, leading to peeling and poor blocking resistance when exposed to ultraviolet rays, which affects the visibility and durability of image display devices.
Innovation Solution
A laminate with a hard coat layer containing a polysilsesquioxane derivative and silica particles, where the abundance ratio of silicon to carbon at the surface is 30% or greater, and an active energy ray-curable resin, combined with a dry film layer having high and low refractive index layers alternately laminated, to enhance adhesion and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a hard coat layer and anti-reflection layer are formed on a light transmitting base to reduce reflection, then visibility is improved, but adhesion between the hard coat layer and anti-reflection layer deteriorates due to ultraviolet exposure
Solution Approach 1:
The invention uses a composite hard coat layer containing both organic binder resin and inorganic metal oxide particles (such as silica, alumina, or titania). This composite structure provides UV resistance from the inorganic particles while maintaining adhesion properties, preventing the peeling that occurs with purely organic hard coat layers when exposed to ultraviolet rays.
Solution Approach 2:
The invention changes the chemical composition parameters of the hard coat layer by incorporating metal oxide particles at specific concentrations (0.1-10 wt% of the total hard coat layer composition). This parameter modification enhances UV stability and maintains adhesion between layers under outdoor exposure conditions.
2Illumination intensity
If a glass-like transparent hard coat layer with smooth outermost surface is used, then optical properties are improved, but blocking resistance deteriorates due to reduced sliding ability
Solution Approach 1:
The invention applies local quality modification by creating a surface layer with different properties than the bulk. The hard coat layer has a smooth inner portion for optimal optical properties, while the outermost surface contains exposed metal oxide particles that provide roughness for enhanced blocking resistance. This local differentiation allows both optical performance and sliding ability to be optimized simultaneously.
Solution Approach 2:
The invention utilizes the particle-based structure where metal oxide particles are dispersed throughout the hard coat layer and some remain exposed on the surface. This creates a micro-rough surface topology that enhances blocking resistance while maintaining overall optical transparency, as the particles are small enough not to significantly scatter light.
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 laminate achieves significant improvement in adhesion and blocking resistance, ensuring better visibility and durability even under outdoor conditions with prolonged exposure to UV rays and environmental fluctuations.
Implementation Method 1
an abundance ratio [(Si/C)×100] of silicon atoms Si to carbon atoms C existing at a surface of the hard coat layer facing the dry film layer is 30% or greater
Implementation Method 2
an active energy ray-curable resin
Data Source
AI summary
To provide a laminate including a base, a hard coat layer disposed on the base, and a dry film layer disposed on the hard coat layer. The hard coat layer includes a polysilsesquioxane derivative. An abundance ratio [(Si/C)×100] of silicon atoms Si to carbon atoms C existing at a surface of the hard coat layer facing the dry film layer is 30% or greater.