| 主权项 |
1. LC medium comprising a low-molecular-weight liquid-crystalline mixture and one or more self-aligning additives of formula I:
R1-A1-(Z2-A2)m1-R2 (I) R2 denotes a group Sp1, Sp3, Sp5 independently of each other, denotes a spacer group or a single bond, Sp2 denotes a trivalent, acyclic spacer group, preferably a group CH, CR0, or N, Sp4 denotes a tetravalent, acyclic spacer group, preferably a carbon atom, Y is independently of each other O, S, (CO), NR0 or a single bond, X1 and X2 independently of each other a group —OH, —NH2, —NHR11, —H, —SR11, —NR112, —OR11 or —(CO)OH, R11 in each case independently denotes a halogenated or unsubstituted alkyl chain having 1 to 15 C atoms, where, in addition, one or more CH2 groups in this alkyl chain may each be replaced, independently of one another, by —C≡C—, —CH═CH—, —(CO)O—, —O(CO)—, —(CO)— or —O— in such a way that O or N atoms are not linked directly to one another, and where two radicals R11 are optionally linked to one another to form a ring, B any ring or condensed ring, optionally substituted by one, two or three RL, p 2, 3, 4 or 5, A1 and A2 each, independently of one another, denote an aromatic, heteroaromatic, alicyclic or heterocyclic group, which may also contain fused rings, and which may also be mono- or polysubstituted by RL, RL in each case, independently of one another, denotes OH, SH, SR0, —(CH2)n1—OH, F, Cl, Br, I, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(R0)2, —C(═O)R0, —N(R0)2, —(CH2)n1—N(R0)2, optionally substituted silyl, optionally substituted aryl or cycloalkyl having 6 to 20 C atoms, or straight-chain or branched alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 1 to 25 C atoms, in which, in addition, one or more H atoms may be replaced by F or Cl, and two vicinal RL together are optionally ═O, n1 denotes 1, 2, 3, 4 or 5, Z2 in each case, independently of one another, denotes a single bond, —O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH2—, —CH2O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —(CH2)n1—, —CF2CH2—, —CH2CF2—, —(CF2)n1—, —CH═CH—, —CF═CF—, —C≡C—, —CH═CH—COO—, —OCO—CH═CH— or CR0R00, R0 and R00 each, independently of one another, denote H or alkyl having 1 to 12 C atoms, R1 denotes H, halogen, straight-chain, branched or cyclic alkyl having 1 to 25 C atoms, in which, in addition, one or more non-adjacent CH2 groups may be replaced by —C≡C—, —CH═CH—, —NR0, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that N, O and/or S atoms are not linked directly to one another, and in which, in addition, one or more tertiary carbon atoms (CH groups) may be replaced by N, and in which, in addition, one or more H atoms may be replaced by F or Cl, and ml denotes 0, 1, 2, 3, 4 or 5. |
