Polymerizable Compound for Wide Band Retardation
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Solution Overview
Problem
Existing retardation films in flat panel displays face challenges in achieving uniform conversion of polarized light over a wide wavelength band due to wavelength dispersion, and current polymerizable compounds have issues with high melting points, production costs, and application difficulties in industrial processes.
Innovation Solution
A polymerizable compound represented by a specific formula is used to produce a polymer that, when combined with an initiator, forms an optical film achieving uniform polarized light conversion across a wide wavelength band at a low cost, with a polymerizable composition that includes the compound and an initiator, facilitating the production of an optically anisotropic article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a known retardation film is used to achieve accurate conversion of specific monochromatic light, then 1/4λ or 1/2λ retardation occurs for specific wavelength, but polarized light is converted into colored polarized light and uniform retardation cannot be achieved over the entire wavelength band
Solution Approach 1:
The patent changes the molecular structure parameters of the polymerizable compound by introducing specific chemical groups (formula I structure with R1, R2, R3 definitions) to achieve reverse wavelength dispersion characteristics, enabling uniform retardation across a wide wavelength band from blue to red light
Solution Approach 2:
The patent creates a composite polymerizable composition containing the polymerizable compound of formula (I) combined with specific solvents (cyclic carbonate, carboxylic acid ester, or ketone) to achieve both wide wavelength coverage and uniform retardation properties
2Length of stationary object
If low-molecular-weight polymerizable compounds are applied to reduce the thickness of the retardation film, then film thickness is reduced, but the compounds have high melting points that are not suitable for industrial processes and narrow liquid crystallinity temperature ranges
Solution Approach 1:
The patent modifies the physical parameters of the polymerizable compound by selecting specific solvent types (cyclic carbonate, carboxylic acid ester, or ketone) to lower the melting point and expand the liquid crystallinity temperature range, making the compound suitable for industrial processing while maintaining thin film capability
Solution Approach 2:
The patent introduces specific solvents as intermediaries between the polymerizable compound and the final film structure, using cyclic carbonate, carboxylic acid ester, or ketone solvents to mediate the physical properties and improve processability during industrial manufacturing
3Length of stationary object
If low-molecular-weight polymerizable compounds are used to reduce film thickness, then the thickness is reduced, but solubility in solvents generally used for industrial process is low
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable compound to enhance solubility in industrially relevant solvents, allowing the compound to be processed in thin film form using standard industrial solvent systems
4Reliability
If polymerizable compounds are synthesized by a plurality of steps using expensive reagents, then the desired optical properties are achieved, but the production cost increases
Solution Approach 1:
The patent extracts and eliminates unnecessary synthesis steps and expensive reagents from the production process, providing a simplified synthesis route for the polymerizable compound of formula (I) that maintains optical performance while reducing production costs
Solution Approach 2:
The patent replaces expensive reagents with more economical alternatives in the synthesis process, using cost-effective materials that achieve the same optical properties without requiring multiple expensive synthesis steps
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 enables the production of an optical film that achieves uniform conversion of polarized light over a wide wavelength band at a low cost, suitable for applications such as antireflective films in touch panels and organic electroluminescent devices, with improved performance and reduced production costs.
Implementation Method 1
a polymer obtained by polymerizing a polymerizable compound represented by the following formula (I)
Data Source
AI summary
The invention provides a polymerizable compound represented by formula (I), a polymerizable composition, and a polymer that have a practical low melting point, can be produced at low cost, and can produce an optical film that achieves uniform conversion of polarized light over a wide wavelength band, and an optically anisotropic article. In the formula: Y1-Y6 represent a single bond, -O-, -O-C(=O)-, -C(=O)-O-, or the like; G1 and G2 represent a bivalent aliphatic group, or the like, of C1-20; Z1 and Z2 represent a C2-10 alkenyl group or the like; Ax represents a C2-30 organic group, or the like, having at least one aromatic ring selected from an aromatic hydrocarbon ring and a hetero-aromatic ring; Ay represents a hydrogen atom, a C1-6 alkyl group, or a C2-30 organic group, or the like, having at least one aromatic ring selected from an aromatic hydrocarbon ring and a hetero-aromatic ring; A1 represents a trivalent aromatic group or the like; A2 and A3 represent a bivalent aromatic group or the like; Q1 represents a hydrogen atom, a C1-6 alkyl group, or the like. Ax and Ay may form a ring together.