Liquid Crystal Composition Reducing Haze in Optically Anisotropic Films
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Solution Overview
Problem
Existing liquid crystal compositions used in optically anisotropic films face challenges in achieving uniform alignment, leading to haze and cissing issues when laminated, which affect the viewability and optical properties of the films.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by formulas (1) and (2), which include fluoroalkyl groups and polymerizable groups, is used to promote alignment and reduce haze, while suppressing cissing during lamination by optimizing the surface energy and alignment of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a liquid crystal composition containing a compound of primarily a discotic core and a long-chain fluorinated alkyl group is used to form an optically anisotropic film, then the liquid crystal molecules can be uniformly aligned by alignment regulation on the air interface side, but cissing occurs when these films are laminated due to low surface energy
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (carboxyl groups or their derivatives) at particular positions on the discotic core structure. This creates localized regions with different surface energy characteristics - the fluorinated alkyl groups provide low surface energy for alignment while the carboxyl groups provide high surface energy for adhesion, allowing both alignment uniformity and lamination compatibility to be achieved simultaneously
Solution Approach 2:
The patent creates a composite molecular structure combining two previously incompatible functional groups: fluorinated alkyl groups (for alignment regulation) and carboxyl groups or their derivatives (for high surface energy and adhesion). This composite structure at the molecular level enables the liquid crystal composition to simultaneously achieve uniform alignment and prevent cissing during lamination
2Productivity
If existing liquid crystal compositions are used to form optically anisotropic films, then the films can be produced, but haze occurs due to non-uniform alignment of liquid crystal molecules causing scattering of light
Solution Approach 1:
The patent changes the chemical parameters of the liquid crystal composition by introducing compounds with specific molecular structures (discotic cores with fluorinated alkyl groups and carboxyl groups). These parameter changes at the molecular level lead to improved alignment regulation and reduced light scattering, thereby reducing haze while maintaining film production efficiency
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 effectively reduces haze and prevents cissing in laminated films, enhancing the viewability and optical properties of optically anisotropic films, making them suitable for various applications including optical members and heat shield films.
Implementation Method 1
the liquid crystal molecules are aligned by an alignment process on the support
Implementation Method 2
The non-uniform alignment of liquid crystal molecules causes scattering of light
Implementation Method 3
techniques have been developed that uniformly align liquid crystal molecules by an alignment regulation provided also on the air interface side
Implementation Method 4
the first layer has a low surface energy, and cissing occurs when these films are laminated
Data Source
AI summary
A liquid crystal composition containing a liquid crystal molecule, a compound represented by the formula (1), and a compound represented by the formula (2) can provide a film with a reduced haze.