Liquid Crystal Copolymer Alignment Uniformity
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Solution Overview
Problem
Existing liquid crystal compositions used for forming light absorption anisotropic films often suffer from insufficient plane shape uniformity due to repelling issues, despite achieving high alignment degrees, when high-molecular weight liquid crystal compounds are used.
Innovation Solution
A liquid crystal composition comprising a high-molecular weight liquid crystal compound blended with a dichroic substance, where the high-molecular weight liquid crystal compound contains repeating units (1) and (2), with repeating unit (1) making up 90% or more and repeating unit (2) 10% or less of the total content, forming a copolymer with specific structural components that enhance alignment and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high-molecular weight liquid crystal compound is used to form a light absorption anisotropic film, then a high alignment degree is achieved, but the liquid crystal composition is repelled on the base material causing insufficient plane shape uniformity
Solution Approach 1:
The patent modifies the chemical structure parameters of the high-molecular weight liquid crystal compound by introducing specific repeating units with defined molecular weights and structures. This changes the interaction parameters between the liquid crystal compound and the base material, reducing repulsion while maintaining alignment properties.
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining the high-molecular weight liquid crystal compound with specific additives or modifiers that mediate the interaction between the compound and the base material. This composite approach maintains the high alignment degree while improving plane shape uniformity by reducing repulsion.
2Stability of the object's composition
If a high-molecular weight liquid crystal compound with specific repeating units is used, then plane shape uniformity is improved, but the alignment degree may be compromised
Solution Approach 1:
The patent optimizes the structural parameters of the repeating units, specifically controlling the molecular weight ranges and chemical structures to maintain optimal interaction with the base material. This parameter optimization ensures both plane shape uniformity and high alignment degree are achieved simultaneously.
Solution Approach 2:
The patent introduces specific local structural features in the repeating units that provide different functions: some regions enhance plane shape uniformity while other regions maintain alignment properties. This local differentiation allows both requirements to be satisfied within the same material system.
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 composition achieves a light absorption anisotropic film with excellent plane shape uniformity and high alignment degree, improving the formation process and properties of such films.
Implementation Method 1
a light absorption anisotropic film having a high alignment degree can be formed
Implementation Method 2
iodine has been widely used as a dichroic substance in these polarizing plates
Implementation Method 3
a light absorption anisotropic film that is excellent plane shape uniformity and has a high alignment degree can be formed
Data Source
AI summary
The present invention provides a liquid crystal composition with which a light absorption anisotropic film excellent in plane shape uniformity with a high alignment degree can be formed, a method of producing same, a light absorption anisotropic film, a laminate, and an image display device. The liquid crystal composition contains a high-molecular weight liquid crystal compound, and a dichroic substance, where the composition is a copolymer containing 90% by mass or more of a repeating unit (1) of Formula (1) and 10% by mass or less of a repeating unit (2) of Formula (2). In Formulae (1) and (2), P1 to P3 represent main chains, L1 to L3 represent a single bond or divalent linking group, P2 to SP3 represent a single bond or spacer group (SP1), M1 to M3 represent mesogenic groups, T1 represents a terminal group, and n and m are integers of 0 or 1.