Polymerizable Liquid Crystal Composition for Homeotropic Alignment
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Solution Overview
Problem
Existing polymerizable liquid crystal compositions face challenges in achieving stable, uniform homeotropic alignment and good adhesion to substrates without surface treatment, particularly on glass and plastic substrates, with issues related to storage stability and alignment uniformity.
Innovation Solution
A polymerizable liquid crystal composition incorporating acrylate, epoxy, and bisphenol fluorene compounds, which improves adhesion and storage stability, allowing for uniform homeotropic alignment on various substrates without the need for special alignment films or surface treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymerizable liquid crystal composition is used to achieve homeotropic alignment on glass or plastic substrates, then adhesion property is improved, but storage stability of the solution deteriorates due to increased viscosity
Solution Approach 1:
The patent modifies the chemical structure of the liquid crystal compound by introducing specific functional groups (cyano, fluoro, chloro substituents) and controlling molecular weight and purity parameters to achieve both good adhesion and storage stability without requiring additional additives
Solution Approach 2:
The patent uses a composite approach by combining the liquid crystal compound with specific additives (surfactant, polymerization initiator, UV absorber, antioxidant) in controlled amounts to achieve both adhesion and storage stability simultaneously
2Ease of manufacture
If a polymerizable liquid crystal composition is used to achieve homeotropic alignment without alignment film, then ease of manufacture is improved, but manufacturing precision of alignment uniformity deteriorates
Solution Approach 1:
The liquid crystal compound performs self-alignment function through its molecular structure and interaction with the substrate, eliminating the need for separate alignment films and achieving uniform homeotropic alignment automatically
Solution Approach 2:
The patent optimizes parameters such as molecular weight, purity (90% or more), and chemical structure (cyano, fluoro, chloro substituents) to ensure uniform alignment without requiring additional alignment films or surface treatments
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 ensures excellent storage stability, uniform homeotropic alignment, and enhanced adhesion to substrates, enabling the formation of high-quality liquid crystal films suitable for optical compensation applications.
Implementation Method 1
A polymerizable compound having a liquid crystal phase provides a polymer having such a function as optical compensation through polymerization. This is because the alignment of the liquid crystal molecules is fixed by polymerization.
Data Source
AI summary
Such a polymerizable liquid crystal composition is to be provided that is excellent in stability in a solution state, shows good coating property on a supporting substrate, and has a uniform homeotropic alignment property. The polymerizable liquid crystal composition contains an acrylate compound, an epoxy compound and a bisphenol fluorene compound. The polymerizable liquid crystal composition contains a compound selected from a group of compounds represented by formulae (1-1) and (1-2) as a component (A), a compound selected from a group of compounds represented by formula (2) as a component (B), a compound selected from a group of compounds represented by formulae (3-1) to (3-3) as a component (C) and a compound selected from a group of compounds represented by formulae (4-1A), (4-1B), (4-2), (4-3), (4-4) and (4-5) as a component (D), and may optionally contain a compound selected from a group of compounds represented by formulae (5-1) and (5-2) as a component (E). The bisphenol fluorene compound is effective for controlling a uniform homeotropic alignment of the polymerizable liquid crystal composition.