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US 11,274,254 B2Granted
Compounds for the homeotropic alignment of liquid-crystalline media
AssigneeMerck Patent GmbH
InventorsMelanie Klasen-Memmer, Edward Plummer, Rocco Fortte, Helmut Haensel, Timo Uebel, Tamara Lehmann
Life of this patent
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Abstract
Liquid-crystalline media (LC media) comprising self-aligning mesogens (self-alignment additives) which effect homeotropic (vertical) alignment of the LC media at a surface or the cell walls of a liquid-crystal display (LC display). The self-alignment additives contain five-ring systems. LC displays having homeotropic alignment of the liquid-crystalline medium (LC medium) without conventional alignment layers are provided.
Claims18
A compound of the formula I-A
- in which
- independently denote a ring of the formula
- p1 denotes 2,
- r1 denotes 0, 1 or 2,
- r2 denotes 1,
- r3 denotes 1,
- r4 denotes 0 or 1, and
- r5 denotes 0 or 1
- L in each case, independently of one another, denotes unbranched alkyl, alkenyl, 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, branched alkyl, alkenyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 3 to 25 C atoms, in which, in addition, one or more H atoms may be replaced by F or Cl, or denotes F, Cl, Br, I, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(R0R00 or cycloalkyl having 3 to 6 C atoms,
- P denotes a polymerisable methacrylate group,
- Sp denotes a spacer group or a single bond,
- R0 in each case, independently of one another, denotes alkyl having 1 to 12 C atoms,
- R00 in each case, independently of one another, denotes H or alkyl having 1 to 12 C atoms,
- R1 denotes an alkyl radical having 1 to 25 C atoms, where, in addition, one or more CH2 groups in this radical may each be replaced, independently of one another, by —CH═CH—, —C≡C—, —CF2O—, —OCF2—
- —O—, —S—, —CO—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F or Cl, or denotes H, or a group -Sp-P,
- Ra denotes an anchor group of the formula
- p denotes 1 or 2,
- q denotes 2 or 3,
- B denotes a substituted or unsubstituted ring system or condensed ring system,
- denotes 1,
- X1, independently of one another, denotes OH, SH, NH2, NHR11, NR112, C(O)OH or —CHO,
- R11 denotes alkyl having 1 to 12 C atoms, when linear or 3 to 12 C atoms when branched, and in which H may be substituted by fluorine or alkoxy having 1 to 8 C atoms,
- Spa, Spc, Spd in each case, independently of one another, denote a spacer group or a single bond, and
- Spb denotes a tri- or tetravalent group.
21 more elements
A compound selected from the following formulae:
- in which
- R1 denotes an alkyl radical having 1 to 25 C atoms, where, in addition, one or more CH2 groups in this radical may each be replaced, independently of one another, by —CH═CH—, —C≡C—, —CF2O—, —OCF2—,
- —O—, —S—, —CO—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F or Cl, or denotes H,
- or a group -Sp-P, wherein P denotes a polymerisable group and Sp denotes a spacer group or a single bond,
- L denotes in each case, independently of one another, denotes unbranched alkyl, alkenyl, 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, or branched alkyl, alkenyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 3 to 25 C atoms, in which, in addition, one or more H atoms may be replaced by F or Cl, or denotes F, Cl, Br, I, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(R0R00 or cycloalkyl having 3 to 6 C atoms, wherein R0 in each case, independently of one another, denotes alkyl having 1 to 12 C atoms, and R00 in each case, independently of one another, denotes H or alkyl having 1 to 12 C atoms,
- and
- Ra denotes an anchor group of the formula
- p denotes 1 or 2,
- q denotes 2 or 3,
- B denotes a substituted or unsubstituted ring system or condensed ring system,
- denotes 0 or 1,
- X1, independently of one another, denotes OH, SH, NH2, NHR11, NR112, C(O)OH or —CHO,
- R11 denotes alkyl having 1 to 12 C atoms when linear or 3 to 12 C atoms when branched, and in which H may be substituted by fluorine or alkoxy having 1 to 8 C atoms,
- Spa, Spc, Spd in each case, independently of one another, denote a spacer group or a single bond, and
- Spb denotes a tri- or tetravalent group.
12 more elements
Dependencies are inferred from the claim text.