Light Curable Adhesive Layer Bonding Window Member
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Solution Overview
Problem
Existing methods for fabricating window members fail to prevent the polymer film from separating from the transparent substrate, particularly due to insufficient adhesion, which can lead to detachment under impact.
Innovation Solution
A method involving a light curable adhesive layer with a storage modulus greater than 103 Pa before curing and greater than 106 Pa after curing, composed of an acrylic copolymer and UV curable compounds, is used to securely bond a transparent substrate to a polymer film, along with a deposition layer and light blocking layer, to enhance adhesion and prevent separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional adhesive is used to couple the polymer film with the transparent substrate, then the adhesive can be easily applied, but the adhesion strength is insufficient and the polymer film separates under impact
Solution Approach 1:
The patent changes the physical and chemical parameters of the adhesive by using a two-component system that undergoes polymerization reaction. The adhesive transitions from a liquid state with low viscosity (easy application) to a solid state with high cross-linked density (high strength). This parameter transformation resolves the contradiction between ease of application and adhesion strength.
Solution Approach 2:
The patent employs a composite adhesive system consisting of two distinct components: a base resin component and a hardener component. These components work synergistically to create a cross-linked polymer network that provides both ease of application (in uncured state) and superior adhesion strength (after curing), thereby resolving the technical contradiction.
2Strength
If the adhesive is made very strong to prevent separation, then adhesion improves, but the adhesive becomes difficult to apply and may damage the substrate
Solution Approach 1:
The patent applies the adhesive in its uncured, low-viscosity state before the substrate and polymer film are fully assembled. This preliminary application allows easy coating and positioning. Subsequently, the adhesive is cured to develop high strength, thus resolving the contradiction between ease of application and coupling strength.
Solution Approach 2:
The patent creates a dynamic adhesive system that changes its properties over time. Initially, the adhesive remains in a flexible, low-viscosity state for easy application. After curing, it transforms into a rigid, high-strength bond. This temporal dynamic property resolution allows the adhesive to satisfy both ease of manufacture and high coupling strength requirements.
3Strength
If a thick adhesive layer is used to ensure sufficient bonding, then adhesion area increases, but the adhesive layer becomes prone to defects and separation
Solution Approach 1:
The patent uses a release film as a template or copying layer to transfer the precise outline and pattern of the substrate to the adhesive layer. This ensures the adhesive is applied only where needed, in a thin uniform layer, eliminating the need for thick adhesive applications and preventing defects associated with thick layers.
Solution Approach 2:
The patent applies the adhesive in a localized, controlled manner using the release film as a guide. Instead of applying a thick uniform layer across the entire surface, the adhesive is precisely deposited only in the required bonding areas, achieving both sufficient bonding strength and manufacturing precision through localized quality control.
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 method effectively prevents the polymer film from separating from the transparent substrate, ensuring robust coupling and improved durability against external impacts.
Implementation Method 1
disposing a light curable adhesive layer on a surface of the transparent polymer film, disposing a transparent substrate on the light curable adhesive layer, and curing the light curable adhesive layer by light irradiation
Data Source
AI summary
A method for fabricating window member may include preparing a transparent polymer film, disposing a light curable adhesive layer on a surface of the transparent polymer film, disposing a transparent substrate on the light curable adhesive layer, the transparent substrate including a transmitting region and a non-transmitting region, and curing the light curable adhesive layer by light irradiation. The light curable adhesive layer may include a transparent adhesive. A storage modulus of the transparent adhesive may be greater than or equal to about 103 Pa to less than about 106 Pa at room temperature before curing, and greater than or equal to about 106 Pa at room temperature after curing.