Polymerizable Liquid Crystal Compound for Optically Anisotropic Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optically anisotropic films formed using polymerizable liquid crystal compounds often suffer from deteriorated reciprocal wavelength dispersion and moisture-heat resistance, particularly under high temperature and humidity conditions.
Innovation Solution
A polymerizable liquid crystal compound with a Clog P value of 4.3 or more but less than 7.0, featuring an aromatic ring as the reciprocal wavelength dispersion expressing portion and cyclohexane rings linked via a single bond in the major axis direction, improves both reciprocal wavelength dispersion and moisture-heat resistance of the optically anisotropic film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cycloalkylene skeleton is used for connection between the minor axis skeleton and major axis, then molecular design is simplified, but the reciprocal wavelength dispersion and moisture-heat resistance of the optically anisotropic film deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters by replacing the cycloalkylene skeleton with an aromatic ring containing specific substituents (Formula Ar-2). This structural parameter change simultaneously improves reciprocal wavelength dispersion and moisture-heat resistance while maintaining manageable molecular design through defined substituent options.
Solution Approach 2:
The patent creates a composite molecular structure combining an aromatic ring core (Formula Ar-2) with specific substituent groups (Z1-Z6, R1-R6). This composite structure integrates the optical properties of the aromatic ring with the functional properties of the substituents, achieving both reciprocal wavelength dispersion and moisture-heat resistance.
2Ease of manufacture
If conventional polymerizable liquid crystal compounds are used, then manufacturing is straightforward, but the optically anisotropic film shows deteriorated reciprocal wavelength dispersion under varying wavelengths
Solution Approach 1:
The patent modifies the molecular structure parameters by introducing an aromatic ring with specific substituent patterns (Formula Ar-2) and controlling the Clog P value of the group represented by Ar. This parameter optimization enables accurate wavelength conversion across a wide range while maintaining ease of manufacture through standard polymerization processes.
3Reliability
If the optically anisotropic film is exposed to high temperature and humidity, then environmental testing is completed, but the birefringence index changes and performance deteriorates
Solution Approach 1:
The patent optimizes the hydrophobicity parameter by controlling the Clog P value of the aromatic ring group (Formula Ar) to be within a specific range. This parameter control enhances moisture-heat resistance and maintains birefringence index stability under high temperature and humidity conditions.
Solution Approach 2:
The patent designs a composite molecular structure with an aromatic ring core and hydrophobic substituent groups (Z1-Z6, R1-R6) that work together to resist moisture penetration. This composite structure maintains composition stability and birefringence index under environmental stress.
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 solution enhances the reciprocal wavelength dispersion and moisture-heat resistance of the optically anisotropic film, maintaining its performance and stability under varying environmental conditions.
Implementation Method 1
A polymerizable compound exhibiting reciprocal wavelength dispersion enables, for example, conversion of accurate light ray wavelengths over a wide wavelength range
Implementation Method 2
the birefringence index of an optically anisotropic film formed changes
Data Source
AI summary
The present invention has an object to provide a polymerizable liquid crystal compound used for formation of an optically anisotropic film having excellent reciprocal wavelength dispersion and moisture-heat resistance, a polymerizable liquid crystal composition, an optically anisotropic film, an optical film, a polarizing plate, and an image display device. The polymerizable liquid crystal compound of the present invention is a polymerizable liquid crystal compound represented by Formula (1), in which a Clog P value of a group represented by Ar in Formula (1) is 4.3 or more and less than 7.0.