Hard Coating Composition for Plastic Film Curling and Cracking
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Solution Overview
Problem
Existing plastic film coatings struggle to achieve high hardness and impact resistance without experiencing curling, warping, or cracking, making them unsuitable as alternatives to glass in mobile appliances and display windows.
Innovation Solution
A coating composition comprising a tri- to hexafunctional acrylate-based monomer, a thermosetting prepolymer composition, a photoinitiator, and inorganic fine particles, which are crosslinked to form a hard and durable plastic film that is resistant to curling and cracking, while maintaining high processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the hard coating layer is increased to improve surface hardness, then the surface hardness becomes higher, but the hard coating layer becomes more prone to setting shrinkage which leads to wrinkling or curling with the concomitant production of cracks or exfoliations
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by incorporating specific monomers (acrylonitrile, vinylidene fluoride, vinyl fluoride) and controlling their ratios. This chemical parameter change enables the coating to achieve high hardness while maintaining flexibility and resistance to setting shrinkage, thereby preventing cracks and exfoliations even at increased thicknesses.
Solution Approach 2:
The patent creates a composite coating layer by combining multiple polymers with different properties - specifically incorporating acrylonitrile-based, vinylidene fluoride-based, and vinyl fluoride-based polymers in specific ratios. This composite structure provides both hardness and flexibility, resolving the contradiction between achieving high surface hardness and preventing coating integrity issues.
2Strength
If the thickness of the hard coating layer is increased to ensure sufficient surface hardness as an alternative to glass, then the surface hardness becomes sufficient, but the coating becomes more prone to curling and warping
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating flexible monomer units (vinylidene fluoride, vinyl fluoride) in controlled amounts. This changes the physical parameters of the coating to include improved flexibility and reduced thermal expansion, preventing curling and warping even when the coating thickness is increased to provide glass-like hardness.
Solution Approach 2:
The patent develops a composite polymer structure combining rigid and flexible components. The acrylonitrile-based polymer provides hardness while the vinylidene fluoride and vinyl fluoride components provide flexibility and dimensional stability, preventing curling and warping in thick coating layers.
3Weight of moving object
If a plastic film composition is used to achieve light weight and impact resistance, then the mobile appliance becomes lighter and more durable, but the hardness is insufficient to substitute for glass panels
Solution Approach 1:
The patent changes the chemical composition parameters of the plastic film by incorporating high-hardness monomers (acrylonitrile, vinylidene fluoride, vinyl fluoride) in optimized ratios. This parameter change enables the plastic film to achieve glass-like hardness while maintaining the inherent advantages of plastic - light weight and impact resistance.
Solution Approach 2:
The patent creates a composite plastic film structure combining multiple polymer types with complementary properties. The acrylonitrile-based polymer contributes hardness, while the vinylidene fluoride and vinyl fluoride polymers contribute flexibility and impact resistance, achieving a balance that substitutes for glass.
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 solution results in a plastic film with enhanced hardness, impact resistance, and scratch resistance, suitable for use in mobile appliances and display windows, offering high transparency and durability, and can withstand significant physical stress without cracking.
Implementation Method 1
a tri- to hexafunctional acrylate-based monomer, a thermosetting prepolymer composition, a photoinitiator
Data Source
AI summary
The present invention relates to a coating composition. More particularly, the present invention relates to a composition capable of forming a plastic film which exhibits high hardness and excellent processability. According to the coating composition of the present invention, a plastic film with the rare occurrence of curling and high hardness can be provided.