Patent ID: 6177152
Filing Date: 2001-01-23
Classification: C09K,G02F

Abstract:
A liquid crystal device, comprising: a pair of substrates each having thereon at least an electrode, and a liquid crystal composition disposed between the substrates, wherein at least one of the substrates is provided with an alignment control layer having a thickness of at most 200 .ANG. and having been subjected to a rubbing uniaxial aligning treatment, and the liquid crystal composition comprises:(i) at least one species of a fluorine-containing mesomorphic compound (B) represented by a formula (II) comprising at least one catenary oxygen atom, a fluorocarbon terminal portion and a hydrocarbon terminal portion, the terminal portions being connected with a central core, said compound (B) having smectic C phase and providing a tilt angle below 30 degrees at a temperature 15.degree. C. below an upper limit temperature of said smectic C phase; and(ii) at least one species of compound (C) in an amount at least 5 wt. % represented by the formula (II) comprising at least one catenary oxygen atom, a fluorocarbon terminal portion and a hydrocarbon terminal portion, the terminal portions being connected with a central core and having a smectic C phase and which provides a tilt angle of at least 30 degrees at a temperature 15.degree. C. below an upper limit temperature of said smectic C phase;the liquid crystal composition containing said compounds (B) and (C) in a total amount of at least 30 wt. %; ##STR52##where A.sup.4, A.sup.5 and A.sup.6 are each independently denote ##STR53##gb, hb and ib are each independently an integer of 0-3 with the proviso that the sum of gb+hb+ib be at least 2;each L.sup.3 and L.sup.4 are independently a single bond, --CO--O--, --O--CO--, --CO--S--, --S--CO--, --CO--Se--, Se--CO----CO--Te--, --Te--CO--, --(CH.sub.2 CH.sub.2).sub.ka --(ka is 1-4), --CH.dbd.CH--, --C.tbd.C, --CH.dbd.N--, --N.dbd.CH--, --CH.sub.2 --O--, --O--CH.sub.2 --, --CO--or --O--;X.sup.2, Y.sup.2 and Z.sup.2 are each a substituent of A.sup.4, A.sup.5 and A.sup.6, respectively, and each X.sub.2, Y.sub.2 and Z.sub.2 are independently --H, --Cl, --F, --Br, --I, --OH, --OCH.sub.3, --CH.sub.3, --CF.sub.3, --O--CF.sub.3, --CN or --NO.sub.2 ; each jb, mb and nb are independently an integer of 0-4;J.sup.2 is --CO--O--C.sub.rc H.sub.2rc --, --O--C.sub.rc H.sub.2rc --, --C.sub.rc H.sub.2rc --, --O--(C.sub.sa H.sub.2sa --O).sub.ta --C.sub.rd H.sub.2rd --, --O--SO.sub.2 --, --SO.sub.2 --, --SO.sub.2 --C.sub.rc H.sub.2rc --, --C.sub.rc H.sub.2rc --N(C.sub.pb H.sub.2pb+1)--SO.sub.2 -- or --C.sub.rc H.sub.2rc --N(C.sub.pb H.sub.2pb+1)--CO--where rc and rd are independently 1-0; sa is independently 1-10 for each (C.sub.sa H.sub.2sa --O), ta is 1-6; pb is 0-4;--R.sup.4 is --O--(C.sub.qc H.sub.2qc --O).sub.wa --C.sub.qd H.sub.2qd+1, --(C.sub.qc H.sub.2qc --O).sub.wa --C.sub.qd H.sub.2qd+1, --C.sub.qc H.sub.2qc --R.sup.6, --O--C.sub.qc H.sub.2qc --R.sup.6, --CO--O--C.sub.qc H.sub.2qc --R.sup.6, or O--CO--C.sub.qc H.sub.2qc --R.sup.6 which may either be straight chain or branched where R.sup.6 is --O--CO--C.sub.qd H.sub.2qd+1 ; --CO--O--C.sub.qd H.sub.2qd+1, --Cl, --F, --CF.sub.3, --NO.sub.2, --CN or --H, qc and qd are independently 1-20; wa is 1-10; andR.sup.5 is (C.sub.xb F.sub.2xb --O).sub.za --C.sub.ya F.sub.2ya+1, where xb is independently 1-10 for each (C.sub.xb F.sub.2xb --O); ya is 1-10; and za is 1-10.