CLASS OF STABLE TRANS-STILBENE COMPOUNDS, SOME DISPLAYING NEMATIC MESOPHASES AT OR NEAR ROOM TEMPERATURE AND OTHERS IN A RANGE UP TO 100{20 {11 C

摘要

A new class of stable trans-stilbene compounds, some displaying nematic mesophases at or near room temperature and others in a range up to 100 DEG C., are useful in liquid crystal display devices. Exemplary compounds are 4-butoxy, 4'-n-butyl- beta -chloro trans-stilbene, having a nematic range of 30 DEG -52 DEG C., 4-ethoxy, 4'-n-butyl- beta -chloro trans-stilbene, having a nematic range of 29 DEG -58 DEG C., and 4-ethoxy, 4'-(2-methylbutyl)- beta -chloro trans-stilbene, having a nematic range of 29 DEG -34 DEG C.; a mixture containing 60 mole-% 4-ethoxy, 4'-n-butyl- beta -chloro trans-stilbene and 40 mole-% 4-ethoxy-4'-n-octyl- beta -chloro trans-stilbene has a nematic range of 8 DEG -59 DEG C.