Liquid crystal medium suitable for use in mobile phones and navigation systems is based on a mixture of polar compounds and contains a fluorinated tris or tetra-phenylene compound

摘要

A liquid crystal medium based on a mixture of polar compounds contains an at least bifluorinated tris or tetra-phenylene compound : A liquid crystal medium based on a mixture of polar compounds contains an at least bifluorinated tris or tetra-phenylene compound of formula (I) R 11>, R 12> : H or up to 15C alkyl or alkenyl optionally substituted once by CN or CF 3 or at least once by halogen, the alkyl or alkenyl groups optionally having one or more CH 2 group replaced by -O-, -S-, 1,3-cyclobutylene, -CF 2O-, -Ctriple boundC-, -OC-O- or -O-CO- with the O atoms not directly linked to each other; ring A : the following optionally halogen-substituted groups : (a) 1,4-cyclohexenylene or 1,4-cyclohexylene optionally with 1 or 2 non-adjacent CH 2 groups replaced by -O- or -S-; (b) 1,4-phenylene with 1 or 2 CH groups optionally replaced by N; or (c) piperidin-1,4-diyl, 1,4-bicyclo[2.2.2]-octylene, a naphthylene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, phenanthrene-2,7-diyl or fluorene-2,7-diyl; and L 1>-L 6> : H or F with at least 2 of L 1>-L 6> being F. [Image].