Patent ID: 6033598
Filing Date: 2000-03-07
Classification: C09K

Abstract:
A guest-host liquid-crystal composition comprising a host liquid-crystal composition containing a dichroic dye, wherein:the host liquid-crystal composition comprises as the main component plural different polycyclic compounds having three or more rings and having no cyano group in the direction of the molecular axis, the proportion of the polycyclic compound component having three or more rings in the host liquid-crystal being at least 75% by mole based on the total moles of the host liquid-crystal composition; andthe guest-host liquid-crystal composition has an order parameter (S value) of at least 0.76, wherein the polycyclic compounds having three or more rings and having no cyano group in the direction of the molecular axis are fluorine-containing liquid-crystal compounds are selected from compounds represented by the following formulae: ##STR239## wherein R.sup.41 represents a linear or branched, alkyl, alkoxy or fluoroalkyl group having from 1 to 10 carbon atoms, an alkoxyalkyl, alkenyl or fluoroalkenyl group having from 2 to 11 carbon atoms, or a substituted cyclohexyl or substituted phenyl group having one or more of these groups as the substituent; R.sup.42 represents a hydrogen atom, a methyl group, a chlorine atom or a fluorine atom; X.sup.41 represents a halogen atom, a linear or branched, alkyl, alkoxy, fluoroalkyl, fluoroalkoxy, fluorochloroalkyl or fluorochloroalkoxy group having from 1 to 10 carbon atoms, or an alkoxyalkyl or fluoroalkenyl group having from 2 to 11 carbon atoms; X.sup.42 represents a linear or branched, alkyl, alkoxy or fluoroalkyl group having from 1 to 10 carbon atoms, or an alkoxyalkyl, alkenyl or fluoroalkenyl group having from 2 to 11 carbon atoms; Y.sup.41 to Y.sup.44 each represents a hydrogen atom or a halogen atom; and Z.sup.41 to Z.sup.46 each represents a hydrogen atom, a halogen atom or a cyano group,provided that in each of structural formulae (1) to (24), at least one of X.sup.41, X.sup.42, Y.sup.41 to Y.sup.44, and Z.sup.41 to Z.sup.44 is a fluorine atom or a fluorine-containing group.