BIREFRINGENT LIQUID CRYSTAL COMPOSITION COMPRISING ALKYLSULFANYLARYL ISOTHIOCYANATO TOLANE COMPOUNDS

摘要

The present invention relates to an optical article comprising a birefringent liquid crystal composition, said composition comprising more than 30 % by weight based on the total weight of the composition of tolane compounds of formula R-S-Z¹-A-Z²-NCS, in which R is a substituted or unsubstituted, linear or branched alkyl group, Z¹ and Z² are aryl groups, and A is an ethynyl group, an arylethynyl group or an ethynylarylethynyl group.