Patent ID: 6139925
Filing Date: 2000-10-31
Classification: C07C,C09K

Abstract:
A liquid-crystal display which is an AMD display containing a liquid-crystal mixture comprising an acidic compound in a concentration of from 10 ppm to less than 10% by weight wherein said acidic compound is a phenol of the formula I ##STR81## in which A.sup.1 and A.sup.2 are each, independently of one another and in the case where A.sup.1 occurs a number of times, these too are each, independently of one another:a) 1,4-cyclohexylene or trans-1,4-cyclohexenylene, in which, in addition, one or more non-adjacent CH.sub.2 groups may be replaced by O and/or S,b) 1,4-phenylene, in which, in addition, one or two CH groups may be replaced by N,c) 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-3,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl,in which (a) and (b) are, independently, unsubstituted, monosubstituted or disubstituted by F atoms,Z.sup.1 and Z.sup.2 are each, independently, of one another and in the case where Z.sup.1 occurs a number of times, each Z.sup.1 is, independently of the other Z.sup.1 s:--CO--O--, --O--CO--, --CO--CH.sub.2 --, --CH.sub.2 --CO--, --CH.sub.2 --O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or a single bond, or one of the groups Z.sup.1 and Z.sup.2 is--(CH.sub.2).sub.4, --(CH.sub.2).sub.3 CO--, --(CH.sub.2).sub.2 --O--CO--, --(CH.sub.2).sub.2 --(CO--O)--, CH.dbd.CH--CH.sub.2 CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.dbd.CH-- or --CH.sub.2 --CH.dbd.CH--CH.sub.2 --,R is H, alkyl or alkenyl having 1 or 2 to 15 carbon atoms respectively, which are unsubstituted, monosubstituted by CN or CF.sub.3 or monosubstituted or polysubstituted by halogen, where, in addition, one or more CH.sub.2 groups in these radicals may be replaced, independently of one another, by --O--, --S--, --CO--, --CO--O--, --O--CO--orCN, F, Cl or COOR', or OH,R' is H or R, where CN, F, OH and COOR' are excludedn is 0, 1 or 2,m is 0 or 1,o is 1, 2 or 3,n+m+o is 2, 3 or 4,X and Y are each, independently of one another and in the case of where X and/or Y occur a number of times, each X is, independently of the other Xs, and each Y is, independently of the other Ys: F, Cl , COOR', NO.sub.2 or CN,p.sub.1, p.sub.2,q.sub.1 and q.sub.2 are each 0, 1, 2, 3 or 4,where o is 1 and q.sub.2 is 0p.sub.2 is 3 or 4where o is 1 and q.sub.2 is 1,2 or 3p.sub.2 +q.sub.2 is 1, 2, 3 or 4where o is 2 or 3p.sub.1 +p.sub.2 +q.sub.1 +q.sub.2 is 1, 2, 3, 4, 5, 6, 7, or 8,where q.sub.1 +q.sub.2 is 1 or 2p.sub.1 +p.sub.2 is 1, 2, 3 or 4where q.sub.1 +q.sub.2 is 0p.sub.1 +p.sub.2 is 3, 4, 5, 6, 7or8.