Liquid-crystal medium comprising polymerizable compounds

A process of preparing an LC medium, comprising the steps of mixing one or more polymerizable compounds comprising a compound of formula I

• wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings
• Ra, Rb P-Sp- or R, wherein at least one of Ra and Rb denotes P-Sp-,
• Aa, Ab phenylene-1,4,-diyl or naphthalene,2-6-diyl which is optionally substituted by one or more groups L,
• Za, Zb —CH═CH—, —CF═CF—, —C≡C— or a single bond,
• P a polymerizable group,
• Sp a spacer group that is optionally substituted by one or more groups P, or a single bond,
• R straight chain alkyl having 1 to 25 C atoms or branched or cyclic alkyl having 3 to 25 C atoms, wherein one or more non-adjacent CH2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, CR0═CR00—, —C≡C—,
• in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl,
• L F, Cl, Br, —CN or straight chain alkyl having 1 to 25 C atoms or branched or cyclic alkyl having 3 to 25 C atoms, wherein one or more non-adjacent CH2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —N(R0)—, —Si(R0R00)—, —CH═CH— or —C≡C— in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl,
• R0, R00 H or alkyl with 1 to 12 C atoms,
• r1 0, 1, 2, 3 or 4,
• with one or more compounds of formula II
• wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings
• R1 and R2 straight chain, cyclic alkyl having 1 to 25 C atoms or branched or cyclic alkyl having 3 to 25 C atoms, wherein one or more non-adjacent CH2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, CR0═CR00—, —C≡C—,
• in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl,
• A1 and A2 a group selected from the following formulae
• wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings
• Z1 and Z2 —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CO—O—, —O—CO—, —C2F4—, —CF═CF—, —CH═CH—CH2O— or a single bond,
• L1, L2, L3 and L4 F, Cl, OCF3, CF3, CH3, CH2F or CHF2,
• Y H, F, Cl, CF3, CHF2 or CH3,
• LC CH3 or OCH3,
• a1 1 or 2,
• a2 0 or 1,
• and optionally with further liquid-crystalline compounds and/or additives, and optionally polymerizing the polymerizable compounds.