Hard Coating Composition for Mobile Displays
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Solution Overview
Problem
Conventional hard coating films for mobile device displays lack sufficient impact resistance and optical properties, with thick coatings prone to cracking and shrinkage issues, and existing solutions like Korean Patent Application Publication No. 2010-0041992 offer insufficient strength to replace glass panels.
Innovation Solution
A hard coating composition comprising mono- to hexa-functional acrylate monomers, photocurable elastic polymers, and photoinitiators, which can be solvent-free, forming a hard coating film with high impact resistance, scratch resistance, and transparency by photocuring, suitable for use as a substitute for glass in display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the hard coating layer is increased to improve surface hardness, then surface hardness is improved, but the coating becomes more prone to setting shrinkage, wrinkling, curling, and cracking
Solution Approach 1:
The invention changes the chemical composition parameters of the coating system by introducing specific oligomers with hydroxyl groups and polyisocyanates, which fundamentally alter the curing mechanism and crosslinking density, allowing high hardness without the defects associated with thick conventional coatings
Solution Approach 2:
The invention creates a composite coating system combining multiple components (oligomers, polyisocyanates, solvents) that work synergistically to achieve both high surface hardness and coating integrity, where each component contributes specific properties that prevent the shrinkage and cracking issues in conventional thick coatings
2Reliability
If a hard coating film is made thin to avoid setting shrinkage and cracking, then coating integrity is improved, but surface hardness becomes insufficient
Solution Approach 1:
The invention changes the chemical parameters by using high-reactivity polyisocyanates and specific oligomer combinations that enable rapid crosslinking and high crosslinking density, achieving glass-level hardness in thin coatings that would otherwise be too thin to provide sufficient protection
3Object-affected harmful factors
If a hard coating composition is made solvent-free to improve environmental performance, then environmental compatibility is improved, but viscosity increases making processing difficult
Solution Approach 1:
The invention changes the physical parameters of the composition by carefully selecting oligomers with appropriate molecular weights and functional group densities, controlling the viscosity to remain within processable ranges even without solvents, while maintaining the environmental benefits of a solvent-free formulation
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 hard coating film exhibits excellent impact resistance, scratch resistance, and transparency, capable of withstanding significant external impacts and scratches, and maintaining optical clarity, making it a viable substitute for glass in mobile device displays.
Implementation Method 1
a hard coating composition, including: a mono- to hexa-functional acrylate monomer; a photocurable elastic polymer; a photoinitiator
Data Source
AI summary
Disclosed herein is a hard coating composition used in forming a hard coating film exhibiting high hardness and excellent properties. The hard coating composition can be used to prepare a hard coating film exhibiting high impact resistance, high scratch resistance and high transparency and having excellent processability.