Liquid-crystal medium comprising polymerizable compounds
AssigneeMerck Patent GmbH
InventorsTimo Uebel, Rocco Fortte, Qiong Tong, Chia-Sheng Hsieh, I-Hua Huang, Leo Weegels
Life of this patent
Estimating the term…
Abstract
A polymerizable compound having absorption in the long UV wavelength range, a liquid-crystal (LC) medium comprising the polymerizable compound, and the use of the compound or LC medium for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the PSA (polymer sustained alignment) or SA (self-aligning) mode, an LC display of the PSA or SA mode comprising the compound or LC medium, and a process of manufacturing the LC display.
Claims20
A polymerizable compound of formula I1:
- wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings:
- P denotes acrylate or methacrylate;
- Sp denotes a single bond;
- L denotes 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 denote H or alkyl with 1 to 12 C atoms;
- and
- r1 denotes 0, 1, 2, 3, or 4.
A process of preparing an LC medium, comprising the steps of mixing one or more polymerizable compounds comprising a compound of formula I1:
- wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings:
- P denotes acrylate or methacrylate;
- Sp denotes a single bond;
- L denotes 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 denote H or alkyl with 1 to 12 C atoms;
- and
- r1 denotes 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 denote 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;
- A1 and A2 denote 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 denote —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
- denote F, Cl, OCF3, CF3, CH3, CH2F, or CHF2;
- Y denotes H, F, Cl, CF3, CHF2, or CH3;
- LC denotes CH3 or OCH3;
- a1 denotes 1 or 2;
- and,
- a2 denotes 0 or 1;
- and
- optionally with further liquid-crystalline compounds and/or additives;
- and
- optionally polymerizing the polymerizable compounds.
Dependencies are inferred from the claim text.