Polymerizable Composition for Low Birefringence Optical Films
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Solution Overview
Problem
Existing optical films using polymerizable compounds with liquid crystallinity lack control over birefringence and wavelength selectivity due to unconsidered combinations of polymerizable compounds, particularly those containing trans-1,4-cyclohexylene and phenylene groups.
Innovation Solution
A polymerizable composition comprising at least two types of compounds with trans-1,4-cyclohexylene and phenylene groups, where the ratio of these groups is controlled to achieve specific birefringence and wavelength selectivity, forming films with low birefringence and high reflection wavelength selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two or more types of polymerizable compounds are combined to obtain necessary birefringence or reflection properties, then the optical properties can be adjusted, but the combination ratio and control methods were not considered in the related art
Solution Approach 1:
The patent applies parameter changes by controlling the ratio of trans-1,4-cyclohexylene groups to phenylene groups in the polymerizable compounds. By adjusting this specific structural parameter ratio (0.2 to 0.8), the invention achieves precise control over birefringence and reflection wavelength selectivity without needing to experiment with numerous compound combinations, thus resolving the contradiction between manufacturing precision and device complexity.
2Manufacturing precision
If polymerizable compounds with liquid crystallinity are used to prepare optical films, then optical properties can be obtained, but the wavelength selectivity and birefringence control are insufficient
Solution Approach 1:
The invention changes the structural parameter ratio of trans-1,4-cyclohexylene groups to phenylene groups (0.2 to 0.8) in the polymerizable compounds to achieve high wavelength selectivity and controlled birefringence. This parameter control ensures consistent optical properties while achieving the desired wavelength selectivity, resolving the contradiction between manufacturing precision and reliability.
3Manufacturing precision
If a film with low birefringence is obtained by using non-liquid crystalline compounds, then reflection selectivity improves, but liquid crystallinity control is lost
Solution Approach 1:
The patent uses composite materials by combining liquid crystalline polymerizable compounds with non-liquid crystalline polymerizable compounds in specific ratios. The liquid crystalline compound provides the necessary liquid crystallinity and optical alignment, while the non-liquid crystalline compound with trans-1,4-cyclohexylene groups contributes to low birefringence and high reflection selectivity. This composite approach resolves the contradiction between reflection selectivity and liquid crystallinity stability.
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 controlled composition enables the production of films with low birefringence and high wavelength selectivity, suitable for applications such as phase difference films and reflection films, while maintaining excellent liquid crystallinity and optical properties.
Implementation Method 1
a polymerizable compound having liquid crystallinity
Implementation Method 2
The birefringence of the polymerizable compound is one of properties closely associated with the optical properties of an optical film to be obtained
Implementation Method 3
it is possible to obtain a reflection film having high selectivity in a reflection wavelength range with a film which is formed by using a polymerizable compound having low birefringence and by immobilizing a cholesteric liquid crystalline phase
Data Source
AI summary
The present invention provides a polymerizable composition containing at least two types of polymerizable compounds represented by Formula (I),in the formula, A represents a phenylene group or a trans-1,4-cyclohexylene group, L represents —OC(═O)—, —OC(═O)O—, and the like, m represents 3 to 12, Sp1 and Sp2 represent a linking group, and Q1 and Q2 represent a polymerizable group, and the like, in which in a case where a number obtained by dividing the number of trans-1,4-cyclohexylene groups by m is set to mc, mc's for the two types of polymerizable compounds are different from each other, at least one of the two types of the polymerizable compounds satisfies 0.5<mc<0.7, and at least the other of the two types of the polymerizable compounds satisfies 0.5<mc; and a polymerizable compound in which m in Formula (I) is 6 to 12. It is possible to provide a film such as a low birefringence phase difference film or a reflection film having high selectivity in a reflection wavelength range by using the polymerizable composition.