Laminate with Optimized Adhesive Elastic Modulus for Bending Resistance
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Solution Overview
Problem
Existing laminates with cured liquid crystal layers lack sufficient bending resistance, often resulting in cracking due to inadequate strain management between the liquid crystal layer and the adhesive layer.
Innovation Solution
A laminate structure comprising a substrate, an adhesive layer, and a first cured liquid crystal layer, where the storage elastic moduli of the substrate, adhesive layer, and liquid crystal layer are optimized to satisfy E1≥E3>E2, with E2 ranging from 1.0×10^5 Pa to 1.0×10^9 Pa, enhancing bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the liquid crystal layer is made rigid to maintain structural integrity, then strength is improved, but bending resistance deteriorates causing cracking
Solution Approach 1:
The patent applies parameter changes by precisely controlling the storage elastic modulus of the adhesive layer (E2) to be 1.0×10^5 Pa to 1.0×10^9 Pa, and establishing the relationship E1≥E3>E2 between the substrate, liquid crystal layer, and adhesive layer. This parameter optimization allows the laminate to maintain structural integrity while achieving excellent bending resistance by preventing strain concentration at the liquid crystal layer-adhesive layer interface.
2Strength
If the adhesive layer has high elastic modulus to strengthen bonding, then strength is improved, but strain management deteriorates leading to cracking
Solution Approach 1:
The patent resolves this contradiction by changing the elastic modulus parameter of the adhesive layer to a specific range (1.0×10^5 Pa to 1.0×10^9 Pa). This optimized parameter allows the adhesive layer to provide sufficient bonding strength while simultaneously managing strain effectively during bending, preventing crack initiation and propagation at the interface.
Solution Approach 2:
The patent employs composite materials by creating a laminate structure with three distinct layers (substrate, liquid crystal layer, and adhesive layer) having specific elastic modulus relationships (E1≥E3>E2). This composite structure combines the strength of the substrate and liquid crystal layer with the strain-managing properties of the optimally designed adhesive layer, achieving both bonding strength and strain management.
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 optimized laminate exhibits improved bending resistance by minimizing strain differences between the liquid crystal layer and the adhesive layer, thereby preventing cracking and ensuring structural integrity.
Implementation Method 1
a first cured liquid crystal layer that is formed by curing a liquid crystal layer containing a cholesteric liquid crystal compound... the laminate has at least one reflection band having a maximal value of a reflectivity in a wavelength range of 300 nm or more and 900 nm or less
Data Source
AI summary
Provided are a laminate including, in the following order: a substrate, an adhesive layer, and a first cured liquid crystal layer that is formed by curing a liquid crystal layer containing a cholesteric liquid crystal compound, in which a storage elastic modulus E1 of the substrate at 25° C., a storage elastic modulus E2 of the adhesive layer at 25° C., and a storage elastic modulus E3 of the first cured liquid crystal layer at 25° C. satisfy E1≥E3>E2, and the E2 is 1.0×105 Pa to 1.0×109 Pa; and a manufacturing method of the same, as well as a decorative film, an article, a decorative panel, and a display device that use the laminate.