Liquid Crystalline Coating Liquid Crystal Removal
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Solution Overview
Problem
Existing methods for producing optically anisotropic films using lyotropic liquid crystalline compounds often result in films with low transparency due to the presence of fine crystals, which are caused by impurities in the coating liquid.
Innovation Solution
A method involving a heating step, a depositing step where the treatment liquid is cooled to below 40°C to precipitate impurities as a deposit, and a removing step using filtration or centrifugation to eliminate these deposits, ensuring the coating liquid is free from fine crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lyotropic liquid crystalline compound containing impurity is used to produce coating liquid, then the manufacturing cost is reduced and ease of manufacture is improved, but fine crystals are formed in the coating liquid which deteriorates the transparency of the optically anisotropic film
Solution Approach 1:
The invention applies preliminary action by performing a heating treatment before film formation to prevent fine crystal formation. The treatment liquid containing the lyotropic liquid crystalline compound and impurity is heated to a specific temperature range (40-100°C) for a predetermined period (0.5-120 minutes) before casting, which eliminates the harmful effect of impurities on transparency while maintaining manufacturing simplicity
Solution Approach 2:
The invention changes the temperature parameter of the treatment liquid to resolve the contradiction. By controlling the heating temperature (40-100°C) and time (0.5-120 minutes), the impurities are prevented from forming fine crystals during coating liquid preparation, thereby maintaining film transparency without requiring high-purity raw materials
2Manufacturing precision
If the coating liquid is cooled to below 40°C after heating, then the deposit is formed and can be removed, but the processing time is increased
Solution Approach 1:
The invention utilizes phase transition by cooling the treatment liquid from the heating temperature down to below 40°C after heating. This temperature change causes the deposit to form from the treatment liquid, allowing for easy removal and achieving high transparency without excessive time loss, as the phase transition occurs naturally during controlled cooling
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
This approach produces a liquid crystalline coating liquid that substantially lacks fine crystals, resulting in optically anisotropic films with improved transparency.
Implementation Method 1
a heating step of heating a treatment liquid containing a lyotropic liquid crystalline compound containing an impurity, and a solvent
Implementation Method 2
a depositing step of depositing a deposit by cooling the treatment liquid after the heating step to a temperature lower than 40° C.
Implementation Method 3
a lyotropic liquid crystalline compound forms a supramolecular associated body in the coating liquid, and the coating liquid exhibits a liquid crystal phase by this associated body
Data Source
AI summary
The present invention provides a method of producing a liquid crystalline coating liquid that substantially does not contain a fine crystal. The method of producing a liquid crystalline coating liquid of the present invention contains a heating step of heating a treatment liquid containing a lyotropic liquid crystalline compound containing an impurity, and a solvent, a depositing step of depositing a deposit by cooling the treatment liquid after the heating step to a temperature lower than 40° C., and a removing step of removing the deposit from the treatment liquid.