FLUESSIGKRISTALLINE PHASE

1. Liquid crystal phase consisting of 3 to 25 components, characterised in that it contains 3 to 15 pyrimidine compounds of the formula I R**1 -A**1 -Z**1 -A**2 -R**2 wherein R**1 and R**2 in each case independently of one another are an alkyl or an alkoxy group with up to 12 C atoms, A**1 is -A-, -A**4 -A- or -A-Z**3 -A**4 -, A is pyrimidine-2,5-diyl, A**2 and A**4 are in each case 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH3 groups and/or CN groups, it also being possible for one or two CH groups to be replaced by N atoms, 1,4-cyclohexylene, it also being possible for one or two non-adjacent CH2 groups to be replaced by 0 atoms, 1,3-dithiane-2,5-diyl, 1,4-bicyclo(2,2,2)-octylene, decahydronapthaline-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, and Z**1 and Z**3 are in each case -CO-O-, -O-CO-, -CH2 CH2 -, -OCH2 -, -CH2 O- or a single bond, these pyrimidine compounds being contained with a total content of 20 to 94%, whereby two pyrimidine compounds of the formula I have four different end group substituents R**1 and R**2 , and the liquid crystal phase further contains other constituents of the formula II R'-L-G-E-R" wherein L and E are each a carbocyclic or heterocyclic ring system from the group formed by 1,4-disubstituted benzene and cyclohexane rings, 4,4'-disubstituted biphenyl, phenylcyclohexane and cyclohexylcyclohexane systems, 2,5-disubstituted 1,3-dioxane rings, 2,6-disubstituted naphthalene, di- and tetra-hydronapthalene, quinazoline and tetrahydroquinazoline, G is -CH=CH- -C-=C- -CH=N- -N(O)=N- -CH=N(O)- -CH2 -CH2 - -CH2 -O- -CH2 -S- or a C-C single bond, and R' and R" are alkyl, alkoxy, alkanoyloxy or alkoxycarbonyloxy with up to 8 carbon atoms, or one of these radicals is also CN, NC, NO2 , CF3 , F, Cl or Br.