US2022315838A1PendingUtilityA1
Liquid-crystalline media
Est. expiryDec 20, 2031(~5.4 yrs left)· nominal 20-yr term from priority
Inventors:Melanie Klasen-MemmerMarcus ReuterRocco FortteDetlef PauluthMatthias BremerHelmut HaenselHarald Hirschmann
C09K 2019/161C09K 19/46C09K 19/3402C09K 19/52C09K 19/44C09K 2019/123C09K 19/12C09K 2019/3027C09K 2323/00C09K 2019/0466C09K 19/10C09K 19/3098C09K 2019/122C09K 19/54C09K 19/32C09K 2019/3425C09K 2019/0448C09K 19/14C09K 19/20C09K 2323/04C09K 19/38C09K 19/062C09K 19/16C09K 19/322C09K 2019/3071C09K 2019/3408C09K 19/58C09K 19/3068C09K 19/3066C09K 19/3405C09K 19/42C09K 19/2014C09K 19/2007
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Claims
Abstract
The invention relates to liquid-crystalline media which can be used, in particular, for electro-optical displays having active-matrix addressing based on the ECB effect and for IPS (in-plane switching) displays or FFS (fringe field switching) displays.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A liquid-crystalline medium comprising:
(i) at least one compound of the formula I,
in which
R 1 and R 1* each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF 2 O—, —CH═CH—,
—O—, —CO—O—, —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen,
Z 1 denotes a single bond, —CH 2 CH 2 —, —CH═CH—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —COO—, —OCO—, —C 2 F 4 —, —CF═CF—, —CH═CHCHO—,
L 1 and L 2 each, independently of one another, denote F, Cl, CF 3 or CHF 2 ;
(ii) at least one compound of the formula CC-n-mV1,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
2 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds selected from the group of compounds of formulae IIA, IIB and IIC,
in which
R 2A , R 2B and R 2C each, independently of one another, denote H, an alkyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may be replaced by —O—, —S—,
—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
L 1-4 each, independently of one another, denote F or Cl,
Z 2 and Z 2′ each, independently of one another, denote a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —CF═CF—, —CH═CHCH 2 O—,
p denotes 1 or 2,
q denotes 1 or 2, and
v denotes 1 to 6.
3 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula PY-n-Om,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
4 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds selected from the group of compounds of formulae CY-n-Om and CPY-n-Om,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
5 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula CC-n-V,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
6 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula CCY-n-Om,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
7 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula PYP-n-m,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
8 . The liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula PP-n-mV1,
in which n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6.
9 . A liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula III,
in which
R 31 and R 32 each, independently of one another, denote a straight-chain alkyl, alkoxyalkyl or alkoxy radical having up to 12 C atoms, and
denotes
Z 3 denotes a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —C 4 H 8 —, —CF═C F—.
10 . A liquid-crystalline medium according to claim 1 further comprising one or more terphenyls of the formulae T-1 to T-21,
in which
R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms, and
m denotes 1-6.
11 . A liquid-crystalline medium according to claim 1 further comprising one or more indane compounds of the formula In,
in which
R 11 , R 12 , R 13 denote a straight-chain alkyl, alkoxy, alkoxyalkyl or alkenyl radical having 1-5 C atoms,
R 12 and R 13 additionally also denote halogen,
denotes
i denotes 0, 1 or 2.
12 . A liquid-crystalline medium according to claim 1 further comprising one or more indane compounds of the formula P4
in which R 1 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF 2 O—, —CH═CH—,
—O—, —CO—O—, —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen.
13 . A liquid-crystalline medium according to claim 1 comprising at least two compounds of the formula I.
14 . A liquid-crystalline medium according to claim 1 comprising at least three compounds of the formula I.
15 . A liquid-crystalline medium according to claim 1 , wherein L1 and L2 each denote fluorine.
16 . A liquid-crystalline medium according to claim 1 comprising at least one compound of the formula I-1 to I-145,
17 . A liquid-crystalline medium according to claim 16 comprising at least one compound of a formula selected from the group consisting of I-1, I-3, I-7, I-13, I-15, I-19, I-25 and I-26.
18 . A liquid-crystalline medium according to claim 17 comprising at least two compounds selected from the group consisting of the formulas I-1, I-3, I-7, I-13, I-15, I-19, I-25 and I-26.
19 . A liquid-crystalline medium according to claim 1 , wherein the proportion of one or more compounds of the formula I in the mixture as a whole is 5-65% by weight.
20 . A liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formula L-1 to L-11,
in which
R, R 1 and R 2 each, independently of one another, have the meanings indicated for R 2A in claim 10 , and alkyl denotes an alkyl radical having 1-6 C atoms, and
s denotes 1 or 2.
21 . A liquid-crystalline medium according to claim 1 further comprising one or more compounds of the formulae O-1 to O-17,
in which
R 1 and R 2 each, independently of one another, denote H, an alkyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may be replaced by —O—, —S—,
—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another.
22 . A process for the preparation of a liquid-crystalline medium according to claim 1 , wherein at least one compound of the formula I is mixed with at least one further liquid-crystalline compound, and one or more additives are optionally added.
23 . A process according to claim 22 , wherein the additive is selected from the group consisting of stabilisers, antioxidants, UV absorbers, nanoparticles, microparticles, polymerisable compounds, dopants and free-radical initiators.
24 . An electro-optical display comprising the liquid-crystalline medium according to claim 1 .
25 . An electro-optical display having active-matrix addressing, wherein the electro-optical display contains, as dielectric, a liquid-crystalline medium according to claim 1 .
26 . The electro-optical display according to claim 25 , wherein the electro-optical display is a VA, PSA, PS-VA, PALC, FFS, PS-FFS, IPS or PS-IPS display.Join the waitlist — get patent alerts
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