Anti-Reflection Film Single Coating Phase Separation
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Solution Overview
Problem
Current anti-reflection film manufacturing processes are complex and result in weak interfacial adhesion between layers, leading to delamination issues and reduced effectiveness due to the need for multiple coating and curing steps in the wet method.
Innovation Solution
An anti-reflection film comprising a high refractive index layer with crosslinked nano silica particles and a low refractive index layer with hollow silica particles coated with a fluorine-based compound, allowing for phase separation and chemical bonding between layers via a single coating process, enhancing scratch resistance and anti-reflection effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wet method is used to manufacture anti-reflection film with multiple layers, then the manufacturing cost is reduced, but the manufacturing process becomes complicated and interfacial adhesion becomes weak
Solution Approach 1:
The patent combines multiple coating layers (hard coat layer, high refractive index layer, and low refractive index layer) into a single integrated coating composition. This composition contains polymer resin, inorganic oxide fine particles for refractive index control, and a surfactant that directs phase separation during drying. The single coating process eliminates the need for separate coating and curing steps for each layer, simplifying the manufacturing process while maintaining low cost.
Solution Approach 2:
The patent uses a surfactant to control the phase separation behavior of the coating composition during the drying process. By adjusting the surfactant concentration and selecting appropriate types, the composition automatically separates into distinct phases with different refractive indices and functional properties. This parameter control enables complex multi-layer structures to form from a single homogeneous coating application.
2Ease of manufacture
If the wet method is used to manufacture anti-reflection film with multiple layers, then the manufacturing cost is reduced, but interfacial adhesion becomes weak leading to delamination
Solution Approach 1:
The patent merges multiple functional layers into a single crosslinked polymer matrix. The polymer resin forms a continuous phase that binds all components together, while the inorganic oxide fine particles are dispersed throughout this matrix. The surfactant-directed phase separation creates regions with different properties, but all regions remain chemically bonded through the crosslinked polymer network, eliminating delamination issues.
Solution Approach 2:
The patent creates a composite material system where organic polymer resin and inorganic oxide particles are combined in a single coating layer. The polymer provides the continuous matrix and adhesion, while the inorganic particles provide refractive index control and hardness. The surfactant facilitates uniform dispersion and bonding between the organic and inorganic phases, creating a cohesive composite structure with superior interfacial adhesion.
3Reliability
If the dry method is used to manufacture anti-reflection film, then strong interfacial adhesion is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces the mechanical/physical deposition processes of the dry method (such as sputtering or vapor deposition) with a chemical solution-based wet coating method. The coating composition contains pre-formed polymer resin and inorganic particles that are applied as a liquid solution, then cured to form the final layer. This substitution achieves comparable or superior adhesion through chemical bonding while dramatically reducing equipment cost and manufacturing complexity.
Solution Approach 2:
The patent uses a composite coating composition that integrates the functions of multiple separate dry-deposited layers into a single wet-coated layer. The polymer resin matrix provides adhesion similar to or better than dry methods, while the dispersed inorganic oxide particles provide the required refractive index properties. This composite approach eliminates the need for expensive vacuum deposition equipment while achieving the desired performance.
4Device complexity
If phase separation is not smoothly achieved by coating, then manufacturing process is simplified, but deteriorated function as each layer still exists
Solution Approach 1:
The patent carefully controls the parameters of the coating composition, including polymer resin molecular weight and type, inorganic oxide particle size and distribution, and surfactant concentration and structure. These parameter optimizations ensure that phase separation occurs smoothly and predictably during the drying process, creating distinct functional regions with the desired properties. The surfactant concentration is specifically tuned to promote appropriate phase separation without causing defects.
Solution Approach 2:
The surfactant acts as an intermediary that mediates the phase separation process. It reduces surface tension and promotes uniform dispersion of inorganic particles in the polymer matrix during coating. During drying, the surfactant directs the phase separation to form the desired layered structure, ensuring that each phase develops the correct functional properties. This intermediary control prevents defects and ensures high manufacturing precision.
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 simplifies the manufacturing process, improves interfacial adhesion, and achieves excellent scratch resistance and anti-reflection performance by forming chemically bonded layers with controlled refractive indices through a single coating step.
Implementation Method 1
The photocurable composition contains a compound having at least two photopolymerizable groups
Implementation Method 2
a low refractive index layer having a lower refractive index than the substrate
Implementation Method 3
a silane coupling agent having in at least one photopolymerizable group
Data Source
AI summary
Disclosed is an anti-reflection film comprising a high refractive index layer comprising a first binder including a crosslinked polymer of a multifunctional (meth)acrylate compound, and nano silica particles dispersed in the first binder; and a low refractive index layer laminated on the high refractive index layer, and comprising a second binder including a crosslinked copolymer of a multifunctional (meth)acrylate compound and a fluorine-based (meth)acrylate compound, and hollow silica particles and hollow silica particles coated with a fluorine-based compound on the surface, which are dispersed in the second binder. Also disclosed is a method for manufacturing the anti-reflection film using a composition that is separated into at least two layers by phase separation after single layer coating by a more simplified process.