Laminate Adhesiveness via Hansen Solubility Parameter Matching
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Solution Overview
Problem
The adhesiveness between polarizing films and barrier layers in image display devices deteriorates due to high alignment degrees of dichroic substances, leading to reduced durability and moisture-heat resistance.
Innovation Solution
A laminate configuration where the barrier layer and light absorption anisotropic film have a specific relationship in Hansen solubility parameters, with the barrier layer containing a polymerizable compound and the film containing a dichroic substance, improving adhesiveness by ensuring the compound from the barrier layer penetrates into the film, thereby reducing brittleness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is provided adjacent to the polarizing film to improve durability, then durability and moisture-heat resistance are improved, but adhesiveness between the barrier layer and the polarizing film deteriorates when the dichroic substance has a high alignment degree
Solution Approach 1:
The patent applies parameter changes by controlling the alignment degree of the dichroic substance within a specific range (0.85 or less) and adjusting the Hansen solubility parameters of the barrier layer and polarizing film materials. By modifying these parameters, the patent achieves both high durability (through the barrier layer) and sufficient adhesiveness (through controlled alignment degree and material compatibility), resolving the contradiction between durability improvement and adhesiveness deterioration.
2Measurement precision
If the alignment degree of the dichroic substance is increased to improve polarization performance, then optical performance is improved, but adhesiveness between the polarizing film and barrier layer deteriorates
Solution Approach 1:
The patent optimizes the alignment degree parameter to be 0.85 or less, balancing polarization performance with adhesiveness. This parameter control ensures that the dichroic substance maintains sufficient alignment for effective light absorption while preventing excessive alignment that would cause adhesiveness deterioration. The patent also adjusts the Hansen solubility parameters of the materials to ensure compatibility and maintain adhesiveness across the acceptable alignment degree range.
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 improved adhesiveness enhances the durability and moisture-heat resistance of the laminate, maintaining excellent performance in image display devices.
Implementation Method 1
adhesiveness between the barrier layer and the light absorption anisotropic film is improved, when a relationship between a highest content of a compound A1 contained in the barrier layer A and a highest content of a compound B1 contained in the light absorption anisotropic film B satisfies a relationship in which a value of distance calculated from Hansen solubility parameters
Data Source
AI summary
A laminate is provided having excellent adhesiveness between a light absorption anisotropic film and a barrier layer, a manufacturing method of the laminate, and an image display device using the laminate. A laminate having: a barrier layer A; and a light absorption anisotropic film B, in which the barrier layer A is adjacently provided on the light absorption anisotropic film B, a relationship between a highest content of a compound A1 contained in the barrier layer A and a highest content of a compound B1 contained in the light absorption anisotropic film B satisfies a relationship in which a value of distance calculated from Hansen solubility parameters and represented by Formula (I) is within a range of 0.0 to 5.0, and the light absorption anisotropic film B contains a component same as the compound A1.distance={4×(δD(B1)−δD(A1))2+(δP(B1)−δP(A1))2+(δH(B1)−δH(A1))2}0.5 (I)