Liquid Crystal Composition to Suppress Precipitation During Alignment Fixing
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Solution Overview
Problem
Existing liquid crystal compositions suffer from poor precipitability of liquid crystal compounds, which affects the performance and stability of optical films and image display devices.
Innovation Solution
A liquid crystal composition comprising a first liquid crystal compound with a polymerizable group at both terminals and a second liquid crystal compound with a different structure at one terminal, both having a maximal absorption wavelength of 280 to 420 nm, is used to suppress precipitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid crystal composition containing a compound with polymerizable groups is used, then the liquid crystal compound can be fixed in place, but the precipitability of the liquid crystal compound increases
Solution Approach 1:
The patent changes the chemical structure parameters of the liquid crystal compounds by introducing specific terminal groups (carboxyl, hydroxyl, or amino groups) that can form hydrogen bonds. This structural modification allows the compounds to maintain liquid crystal properties while reducing precipitability during polymerization, thus resolving the contradiction between fixing stability and compositional stability.
Solution Approach 2:
The patent uses composite liquid crystal compounds that combine polymerizable groups with terminal groups capable of hydrogen bonding. This composite structure enables both polymerization for fixation and hydrogen bonding for preventing precipitation, simultaneously achieving reliability improvement and precipitability suppression.
2Stability of the object's composition
If the liquid crystal compound structure is modified to improve precipitability, then the alignment properties may be compromised
Solution Approach 1:
The patent applies local quality by introducing terminal groups (carboxyl, hydroxyl, or amino groups) at specific locations (terminals) of the liquid crystal molecules. These localized modifications enable hydrogen bonding at the molecular level without disrupting the overall molecular structure and alignment properties, thus improving precipitability while maintaining alignment precision.
3Reliability
If polymerization is performed to fix the liquid crystal alignment, then the liquid crystal compound may precipitate during the process
Solution Approach 1:
The patent employs preliminary action by establishing hydrogen bonding interactions between liquid crystal compounds before polymerization occurs. This pre-established intermolecular bonding network maintains composition homogeneity and prevents precipitation during the subsequent polymerization process, ensuring both fixed alignment and compositional 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 composition effectively reduces precipitability, leading to improved stability and performance of liquid crystal cured layers, optical films, and image display devices.
Implementation Method 1
both the first liquid crystal compound and the second liquid crystal compound have a maximal absorption wavelength in a wavelength range of 280 to 420 nm
Data Source
AI summary
An object of the present invention is to provide a liquid crystal composition in which precipitability of a liquid crystal compound is suppressed, a liquid crystal compound, a liquid crystal cured layer, an optical film, a polarizing plate, and an image display device. The liquid crystal composition of the present invention contains a first liquid crystal compound represented by Formula (1) and a second liquid crystal compound represented by Formula (2), in which both the first liquid crystal compound and the second liquid crystal compound have a maximal absorption wavelength in a wavelength range of 280 to 420 nm.