Liquid crystal medium

A liquid crystal (LC) medium comprising a polymerizable component A) comprising

• at least one direactive polymerizable compound selected from the following compounds
• in which each variable on each occurrence identically or differently, independently of one another, has the following meaning:
• Sp1, Sp2 is a spacer group or a single bond,
• P1, P2 is a polymerizable group,
• L is F, Cl, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(Rx)2, —C(═O)Y1, —C(═O)Rx, —N(Rx)2, optionally substituted silyl, optionally substituted aryl or heteroaryl having 5 to 20 ring atoms, or straight-chain or branched alkyl having 1 to 25 C atoms, in which one or more non-adjacent CH2 groups may each be replaced, independently of one another, by —C(R0)═C(R00)—, —C≡C—, —N(R0)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by F, Cl or CN,
• Z1-3 is —O—, —CO—, —CO—O—, —O—CO—, —C(RyRz)—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH2CH2— or —CF2CF2—,
• Rx is H, F, Cl, CN, or straight chain, branched or cyclic alkyl having 1 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— 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,
• Ry, Rz is H, F, CH3 or CF3,
• R0, R00 is H or alkyl having 1 to 20 C atoms,
• Y1 is halogen,
• r is 0, 1, 2, 3 or 4,
• s is 0, 1, 2 or 3, and
• t is 0, 1 or 2,
• and
• at least one polymerizable compound having three or more polymerizable groups selected from the following compounds
• in which
• Sp1, Sp2 is a spacer group or a single bond,
• P1, P2 is a polymerizable group,
• L is F, Cl, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(Rx)2, —C(═O)Y1, —C(═O)Rx, —N(Rx)2, optionally substituted silyl, optionally substituted aryl or heteroaryl having 5 to 20 ring atoms, or straight-chain or branched alkyl having 1 to 25 C atoms, in which one or more non-adjacent CH2 groups may each be replaced, independently of one another, by —C(R0)═C(R00)—, —C≡C—, —N(R0)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by F, Cl or CN,
• P3 has one of the meanings given for P1, Sp3 has one of the meanings given for Sp1,
• r is 0-4,
• s is 0-3, and
• t is 0-2,
• and
• a liquid-crystalline component B) comprising one or more mesogenic or liquid crystalline compounds, which comprises one or more compounds of formula T1 to T22 or T24
• in which
• R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms,
• R* denotes a straight-chain alkenyl radical having 2-7 C atoms,
• (O) denotes an oxygen atom or a single bond, and
• m denotes an integer from 1 to 6,
• and
• optionally one or more compounds selected from formulae AN, AY, CY, PY and ZK
• in which each variable, on each occurrence identically or differently, independently of one another, has the following meaning:
• RA1 is alkenyl having 2 to 9 C atoms or, if at least one of the rings X, Y and Z denotes cyclohexenyl, may have one of the meanings of RA2,
• RA2 is alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another,
• Zx denotes —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CO—O—, —O—CO—, —C2F4—, —CF═CF—, —CH═CH—CH2O— or a single bond,
• L1 and L2 are H, F, Cl, OCF3, CF3, CH3, CH2F, CHF2H,
• x is 1 or 2, and
• z is 0 or 1,
• wherein
• a denotes 1 or 2,
• b denotes 0 or 1,
• R1 and R2 each, independently of one another, denote alkyl having 1 to 12 C atoms, where, in addition, one or two non-adjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another,
• Zx and Zy each, independently of one another, denote —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CO—O—, —O—CO—, —C2F4—, —CF═CF—, —CH═CH—CH2O— or a single bond,
• L1-4 each, independently of one another, denote F, Cl, OCF3, CF3, CH3, CH2F, CHF2,
• in which the individual radicals have the following meanings:
• R3 and R4 each, independently of one another, denote alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —O—CO— or —CO—O— in such a way that O atoms are not linked directly to one another, and
• Zy denotes —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or a single bond,
• wherein
• the concentration of the polymerizable compounds having two or more polymerizable groups in the LC medium is ≤2% by weight,
• the concentration of the polymerizable compounds having three or more polymerizable groups in the LC medium is ≤1% by weight,
• the concentration of direactive polymerizable compounds having two polymerizable groups is at a concentration above 0% and ≤1% by weight,
• the concentration of trireactive polymerizable compound having three polymerizable groups is at a concentration above 0% and ≤0.5% by weight, and
• the concentration of unpolymerizable terphenyl compounds of formula T1 to T22 and T24 is above 0% and ≤3% by weight.