17-05-2018 дата публикации
Номер: US20180134959A1
The present invention relates to a liquid crystal (LC) medium comprising a polymerisable compound, to a process for its preparation, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in an LC display of the polymer sustained alignment (PSA) type, and to an LC display, especially a PSA display, comprising it. 8. The LC medium according to claim 1 , characterized in that the polymerisable compounds are selected of formula I{'br': None, 'sup': a', '1', 'b', '2', 'b, 'sub': 'm', 'R—B—(Z—B)—R\u2003\u2003I'}in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning:{'sup': a', 'b, 'sub': '2', 'Rand RP, P-Sp-, H, F, Cl, Br, I, —CN, —NO, —NCO, —NCS, —OCN,'}{'sub': 5', '2, 'sup': 0', '00', '00', '1', '2', 'a', 'b, '—SCN, SFor straight-chain or branched alkyl having 1 to 25 C atoms, in which, in addition, one or more non-adjacent CHgroups may each be replaced, independently of one another, by —C(R)═C(R)—, —C≡C—, —N(R)—, —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, in addition, one or more H atoms may be replaced by F, Cl, Br, I, CN, P or P-Sp-, where, if Band/or Bcontain a saturated C atom, Rand/or Rmay also denote a radical which is spiro-linked to this saturated C atom,'}{'sup': a', 'b, 'wherein at least one of the radicals Rand Rdenotes or contains a group P or P-Sp-,'}P a polymerisable group,Sp a spacer group or a single bond,{'sup': 1', '2, 'Band Ban aromatic, heteroaromatic, alicyclic or heterocyclic group, preferably having 4 to 25 ring atoms, which may also contain fused rings, and which is unsubstituted, or mono- or polysubstituted by L,'}{'sup': b', '0', '00, 'sub': 2', '2', '2−', '2', '2', '2', '2', '2', '2', 'n1', '2', '2', '2', '2', '2', 'n1, 'Z—O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH—, —CHO—, —SCH, —CHS—, —CFO—, —OCF—, —CFS—, —SCF ...
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