Optical retardation film and method of production thereof
a technology of optical retardation film and liquid crystal display, which is applied in the direction of layered products, chemistry apparatus and processes, synthetic resin layered products, etc., can solve the problems of oblique viewing angle contrast ratio decrease, polarizers become uncrossed, and affect the quality of liquid crystal displays
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example 1
[0053]This example describes synthesis of a rigid rod-like macromolecule of the general structural formula (I), wherein R1 is CH3, M is Cs and k is equal to n.
[0054]
[0055]30 g 4,4′-Diaminobiphenyl-2,2′-disulfonic acid was mixed with 300 ml pyridine. 60 ml of acetyl chloride was added to the mixture with stirring and the resulting reaction mass agitated for 2 hrs at 35-45° C. Then it was filtered, the filter cake was rinsed with 50 ml of pyridine and then washed with 1200 ml of ethanol. The obtained alcohol wet solid was dried at 60° C. Yield of 4,4′-bis(acetylamino)biphenyl-2,2′-disulfonic acid pyridinium salt is 95%.
[0056]12.6 g 4,4′-bis(acetylamino)biphenyl-2,2′-disulfonic acid pyridinium salt was mixed with 200 ml DMF. 3.4 g sodium hydride (60% dispersion in oil) was added. The reaction mass was agitated 16 hrs at room temperature. 7.6 ml methyl iodide was added and the reaction mass was stirred 16 hrs at room temperature. Then the volatile components of the reaction mixture were...
example 2
[0059]This example describes synthesis of a rigid rod-like macromolecule comprising n organic units of the first type having general structural formula I
[0060]
[0061]k organic units of the second type having general structural formula II
[0062]
[0063]wherein n is in the range from 0 to 10,000, and k is in the range from 0 to 10,000, sum n+k≧10, R1 is H, R2 is CH3, M is Cs. 4,4′-bis[methylamino]biphenyl-2,2′-disulfonic acid is obtained as described in Example 1. 0.8 g of 4,4′-bis[methylamino]biphenyl-2,2′-disulfonic acid, 0.72 g of 4,4′-bis[methylamino]biphenyl-2,2′-disulfonic acid and 3.29 g cesium bicarbonate were mixed with 6 ml water. This solution is stirred with IKA UltraTurrax T25 at 5 000 rpm for 2 min. 4.0 ml of toluene is added to the solution with stirring at 20 000 rpm for 5 sec. Then solution of 0.92 g terephthaloyl chloride in 2.0 ml of toluene is added to the mixture at 20000 rpm for 5 sec. The emulsion of polymer is stirred for 5 min.
[0064]The obtained foam plastic mass ...
example 3
[0068]This example describes preparation of a solid optical retardation layer of negative C-type from a solution of a rigid rod-like macromolecule according to the present invention.
[0069]2 g of organic compound produced as described in Example 2 was dissolved in 100 g of de-ionized water (conductivity ˜5 μSm / cm); the suspension was mixed with a magnet stirrer. After dissolving, the solution was filtered at the hydrophilic filter of a 45 μm pore size and evaporated to the viscous isotropic solution of concentration of solids of about 6%.
[0070]Fisher brand microscope glass slides were prepared for coating by soaking in a 10% NaOH solution for 30 min, rinsing with deionized water, and drying in airflow with the compressor. At a temperature of 22° C. and relative humidity of 55% the obtained LLC solution was applied onto the glass panel surface with a Gardner® wired stainless steel rod #14, which was moved at a linear velocity of about 10 mm / s. The solid optical layer was dried with a ...
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