Transparent Molded Body Antireflective Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antireflective coatings struggle with achieving a balance between antifouling properties, scratch resistance, and effective reflectivity, often requiring multiple layers or specific surface structures that are difficult to control, and may not adequately address soiling or decomposition issues.
Innovation Solution
A transparent molded body with a fine uneven structure formed by an active energy ray-curable resin, featuring a specific composition of polyfunctional (meth)acrylate units, hydrophilic (meth)acrylate units, and monofunctional monomer units, which provides a water contact angle of ≤25° and a modulus of elasticity ≥200 MPa, enhancing antifouling and scratch resistance while maintaining effective antireflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fine uneven structure is formed on the surface to reduce refractive index and reflectivity, then antireflective performance is improved, but antifouling property deteriorates due to high surface energy
Solution Approach 1:
The patent changes the surface energy parameter by incorporating fluorine-containing compounds into the resin composition, which reduces surface energy from typically high values to below 20 mN/m. This parameter change enables the surface to exhibit antifouling properties while maintaining the fine uneven structure for antireflective performance
Solution Approach 2:
The patent uses a composite resin composition containing fluorine-containing compounds mixed with the base resin (polymerizable monomer or oligomer). This composite material combines the structural benefits of the fine uneven structure with the low surface energy properties of fluorine compounds, achieving both antireflective and antifouling functions simultaneously
2Ease of operation
If surface energy is reduced to improve antifouling property, then ease of cleaning is improved, but scratch resistance deteriorates
Solution Approach 1:
The patent optimizes the concentration parameter of fluorine-containing compounds to a specific range (0.1-10 parts by weight per 100 parts resin). This controlled parameter change achieves sufficient surface energy reduction for antifouling while preventing excessive softening that would compromise scratch resistance
Solution Approach 2:
The patent creates local quality differentiation where the fluorine-containing compounds concentrate at the surface region to provide antifouling properties, while the bulk resin composition maintains its structural integrity and hardness for scratch resistance. The surface layer has different chemical composition than the interior
3Illumination intensity
If multiple layers are laminated to reduce reflectivity, then antireflective performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions (antireflective coating and antifouling coating) into a single integrated layer. By incorporating fluorine-containing compounds directly into the resin composition that forms the uneven structure, the patent eliminates the need for separate lamination steps, reducing device complexity while maintaining antireflective performance
Solution Approach 2:
The patent creates a universal coating material that simultaneously provides antireflective properties (through the fine uneven structure) and antifouling properties (through fluorine-containing compounds). This multi-functional material eliminates the need for multiple specialized layers
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 achieves excellent antifouling properties, scratch resistance, and antireflectivity with a simple, controlled surface structure, effectively reducing reflectivity and facilitating easy cleaning, suitable for applications like antireflective films and optical articles.
Implementation Method 1
an active energy ray-curable composition is formed on at least one surface of the transparent substrate, wherein the active energy ray-curable composition includes a polymerizable monomer or a polymerizable oligomer
Implementation Method 2
the uneven structure has a gap between the adjacent convex portions that is equal to or less than the wavelength of visible light
Implementation Method 3
the water contact angle of the surface of the uneven layer is equal to or less than 25°
Data Source
AI summary
The present transparent molded body is a transparent molded body including a transparent substrate and an uneven layer composed of a cured product of an active energy ray-curable composition formed on at least one surface of the transparent substrate, wherein the uneven layer has an uneven structure having a gap between the adjacent convex portions equal to or less than the wavelength of a visible light, the water contact angle of the surface of the uneven layer is equal to or less than 25°, and the modulus of elasticity of the surface of the uneven layer is equal to or more than 200 MPa.