Polymerizable Compound for Uniform Polarized Light Conversion
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Solution Overview
Problem
Existing polymerizable compounds for producing retardation films have issues with reverse wavelength dispersion, high melting points, low solubility in industrial solvents, and high production costs, making it difficult to achieve uniform conversion of polarized light over a wide wavelength band.
Innovation Solution
A polymerizable compound represented by a specific formula, which includes a trivalent benzene or naphthalene ring group, and divalent aliphatic groups, is used to produce a polymerizable composition that can be polymerized with an initiator, resulting in a liquid crystalline polymer suitable for producing optically anisotropic articles with uniform polarized light conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If low-molecular-weight polymerizable compounds are used to reduce film thickness, then the retardation film thickness can be reduced, but reverse wavelength dispersion is insufficient and production cost increases
Solution Approach 1:
The patent modifies the molecular structure of polymerizable compounds by introducing specific groups ( Formula (I) with parameters x, y, z, and R1-R6) to change the wavelength dispersion characteristics. This structural parameter change enables reverse wavelength dispersion while maintaining low molecular weight and low melting point properties, resolving the contradiction between film thickness reduction and dispersion quality.
2Length of stationary object
If low-molecular-weight polymerizable compounds are used to reduce film thickness, then the retardation film thickness can be reduced, but production cost increases due to multi-step synthesis using expensive reagents
Solution Approach 1:
The patent extracts and eliminates the need for expensive reagents and multi-step synthesis processes by providing a direct synthesis method using readily available starting materials. The invention achieves the desired polymerizable compound structure through simplified reaction pathways, removing the harmful factor of high production cost while maintaining the benefit of reduced film thickness.
3Ease of manufacture
If existing polymerizable compounds are used, then film application is possible, but melting point is high and solubility in industrial solvents is low
Solution Approach 1:
The patent changes the physical parameters (melting point and solubility) by modifying the chemical structure of the polymerizable compound. The specific molecular structure defined in Formula (I) with adjustable parameters enables low melting point and high solubility in industrial solvents, while still allowing film application. This resolves the contradiction between ease of manufacture and temperature characteristics.
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 method allows for the production of optically anisotropic articles that achieve uniform conversion of polarized light over a wide wavelength band at a low cost, with improved solubility and processing characteristics.
Implementation Method 1
a polymerizable composition that includes the polymerizable compound and an initiator
Implementation Method 2
liquid crystalline polymer suitable for producing optically anisotropic articles with uniform polarized light conversion
Implementation Method 3
optically anisotropic articles that achieve uniform conversion of polarized light
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to: a hydrazine compound represented by formula (3), wherein Ax and Ay have the meanings indicated in claims 1 to 5; a method for producing an optically anisotropic article by (i) obtaining a polymerizable compound by reacting the hydrazine compound with a carbonyl compound, (ii) forming an alignment film on a substrate, and (iii) forming a liquid crystal layer on the alignment film using the polymer obtained by polymerizing the polymerizable compound or a polymerizable composition including the polymerizable compound and an initiator; and a method for producing a polymerizable compound represented by formula (I), by reacting the hydrazine compound with a carbonyl compound represented by formula (4). The film thus obtained has a low melting point, excellent solubility, is capable of being manufactured at low cost, and capable of uniform polarized light conversion across a broad wavelength region.