Patent ID: 6280653
Filing Date: 2001-08-28
Classification: C09K

Abstract:
A liquid crystal composition comprising:(1) an achiral host mixture comprising:(a) at least 20% by weight, based on the total weight of the host mixture, of at least two difluorinated phenylpyrimidine (diFPYP) compounds capable of exhibiting an SmC phase, wherein the at least two difluorinated phenylpyrimidine compounds are of the general formula shown below: ##STR13##wherein X.sub.1 and X.sub.2 are independently selected from the group consisting of (C.sub.1 -C.sub.12)alkyl and (C.sub.1 -C.sub.12)alkoxy, and m is equal to 2, and(b) at least 10% by weight, based on the total weight of the host mixture, of at least one fluorinated terphenyl compound which is selected from the group consisting of difluorinated terphenyl compounds and trifluorinated terphenyl compounds and which enhances the phase of said mixture, wherein the total amount of (a) and (b) is at least 50% by weight based on the total weight of the host mixture, wherein component (b) is selected from difluorinated terphenyl compounds and trifluorinated terphenyl compounds represented by the general formula shown below: ##STR14##where X.sub.1 and X.sub.2 are independently selected from the group consisting of (C.sub.1 -C.sub.12)alkyl and (C.sub.1 -C.sub.12)alkoxy, and x is equal to 0, 1, 2, or 3, y is equal to 0, 1, 2, or 3, and z is equal to 0, 1, 2, or 3 with the proviso that the total of (x+y+z) is equal to 2 or 3; and(2) at least one chiral dopant in an amount of not more than 10% by weight of the total weight of the composition.