Transfer Sheet UV Curable Resin Adhesion Optical Laminate
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Solution Overview
Problem
The existing methods for transferring a liquid crystal layer using heat sealing often result in inadequate optical properties due to the elution of uncured material from the liquid crystal layer into the thermoplastic adhesive layer, leading to insufficient adhesiveness between layers.
Innovation Solution
Incorporating an ultraviolet curable resin into the thermoplastic welded layer, which is in direct contact with a block layer containing a (meth)acrylic polymer, to enhance adhesiveness and prevent material elution, while maintaining the optical properties of the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a block layer is provided between the thermoplastic welded layer and the liquid crystal layer to prevent elution, then optical properties are preserved, but adhesiveness between layers becomes insufficient
Solution Approach 1:
The thermoplastic welded layer is formulated as a composite material containing both thermoplastic resin and ultraviolet curable resin. This composite structure enables dual functionality: the thermoplastic resin provides heat-sealing capability while the ultraviolet curable resin forms strong chemical bonds with the (meth)acrylic polymer in the block layer, achieving both optical property preservation and high adhesiveness simultaneously
Solution Approach 2:
The invention changes the chemical composition parameters of the thermoplastic welded layer by incorporating ultraviolet curable resin. This parameter change transforms the layer from a simple thermoplastic material to a composite that can undergo both thermal bonding and UV-induced polymerization, thereby achieving strong adhesion to the block layer while maintaining the barrier function
2Ease of manufacture
If heat sealing is used to transfer the liquid crystal layer, then the transfer process is simple, but uncured material elutes into the thermoplastic adhesive layer causing poor optical properties
Solution Approach 1:
The block layer acts as an intermediary barrier between the liquid crystal layer and the thermoplastic welded layer. It prevents uncured material from eluting into the thermoplastic adhesive layer during heat sealing, while the ultraviolet curable resin in the thermoplastic welded layer forms strong bonds with the block layer, maintaining both process simplicity and optical property integrity
Solution Approach 2:
The invention extracts the harmful elution process by introducing the block layer as a barrier. This separates the heat sealing function from the adhesion function, allowing heat sealing to proceed without material contamination while the UV curable resin provides the necessary bonding strength
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 high adhesiveness between the thermoplastic welded layer and the block layer, ensuring the optical properties of the liquid crystal layer are preserved and maintained during the transfer process, resulting in a robust and functional optical laminate.
Implementation Method 1
the thermoplastic welded layer includes a thermoplastic resin and an ultraviolet curable resin
Implementation Method 2
high adhesiveness between the thermoplastic welded layer and the block layer
Data Source
AI summary
Provided is a transfer sheet of a cured liquid crystal composition layer, which has optical properties as designed while exhibiting high adhesiveness between respective layers and good adhesiveness to a base material. Also provided is an optical laminate including a cured liquid crystal composition layer and a thermoplastic welded layer, which exhibits high adhesiveness between respective layers. A transfer sheet includes a cured liquid crystal composition layer, a block layer including a (meth)acrylic polymer, and a thermoplastic welded layer in this order, the thermoplastic welded layer and the block layer are in direct contact with each other, and the thermoplastic welded layer includes a thermoplastic resin and an ultraviolet curable resin.