Liquid-crystalline medium and liquid-crystal display

Liquid-crystalline medium having positive dielectric anisotropy, characterised in that it comprises

• one or more polymerisable compounds of formula I
• in which
• P11 and P12 are independently from one another a polymerisable group,
• Sp11 and Sp12 are independently from one another a spacer group having from one to 10 C-atoms or a single bond,
• X11 and X12 are independently from one another —O—, —O—CO—, —CO—O—, —O—CO—O— or a single bond,
• L are in each occurrence independently from each other H, F, Cl or alkyl with 1 to 5 C-atoms, preferably H, F or Cl,
• r and s independently of one another are 0, 1, 2 or 3,
• t is 0, 1 or 2,
• and
• one or more dielectrically positive compounds selected from the group of compounds of formulae II and III:
• in which
• R2 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms,
• on each appearance, independently of one another, denote
• L21 and L22, independently of one another, denote H or F,
• X2 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms,
• m denotes 0, 1, 2 or 3,
• R3 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms,
• on each appearance, independently of one another, denote
• L31 and L32, independently of one another, denote H or F,
• X3 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms,
• Z3 denotes —CH2CH2—, —CF2CF2—, —COO—, trans-CH═CH—, trans-CF═CF—, —CH2O— or a single bond, and
• n denotes 0, 1, 2 or 3,
• and
• optionally one or more dielectrically neutral compounds of the formula IV
• in which
• R41 and R42, independently of one another, have the meanings indicated above for R2 under formula II,
• independently of one another and, if
• occurs twice, also these independently of one another, denote
• Z41 and Z42, independently of one another and, if Z41 occurs twice, also these independently of one another, denote —CH2CH2—, —COO—, trans-CH═CH—, trans-CF═CF—, —CH2O—, —CF2O—, —C≡C— or a single bond, and
• p denotes 0, 1 or 2.