Liquid crystalline chiral compound, compositions and...

Details Liquid crystalline chiral compound, compositions and... Liquid crystalline chiral compound, compositions and...

C - Chemistry, Metallurgy

09

K

31/105

C09K 19/34 (2006.01) C07D 319/06 (2006.01) C09K 19/60 (2006.01)

Patent

CA 1189311

ABSTRACT A novel nematic liquid crystalline composition is provided. A nove1 liquid crystalline chiral compound, (+)5-(2-methyl) butyl-2(4-cyanopheny 1)-1, 3-dioxane, is also provided. When admixed together, these novel com- ponents form a phase-change cholesteric liquid crystalline composition which is highly useful as the host medium in a guest-host electrooptical display as d result of its low electrical threshold and optical saturation voltages, steep saturation curve, relatively low optical birefringence, low viscosity and broad liquid crystalline mesomorphic range. The host medium in conjunction with a suitable pleochroic dye provides an improved guest-host composition which exhibits a contrast of greater than 3:1 in certain displays, especially those having liquid crystal align- ment layer means providing a moderate tilt angle of 10°-40° at the sub- strate/guest-host composition interface.

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