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US4637897A
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Nematic compounds
Assignee: Merck Patent GmbH
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Filing: 1984-08-06
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Granted: 1987-01-20
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Expires: 2004-08-06
Abstract
Abstract Nematic compounds with a negative DC antisotropy, characterized by the formula I ##STR1## in which m=1 or 2, r is zero or 1 and m+r=1 or 2, and R 1 and R 2 are identical or different and are selected from alkyl and alkoxy groups each having 1-12 carbon atoms in a straight or branched chain, which may be chiral, Z is a bridge member selected from a single bond and the groups of the formulae --CH 2 CH 2 --, --OCH 2 --, --O--CO-- or --CO--O--, one of the groups X and Y is selected from fluorine, chlorine, bromine and cyano and the other of the groups X and Y is selected from hydrogen, fluorine, chlorine, bromine and cyano, with the proviso that m=r=1 if X and Y are both cyano, are suitable as components for liquid crystal mixtures having an overall negative DC anisotropy, such as are required in particular for electro-optical displays of the type of guest/host displays or homotropic-nematic displays.
Inventors
- 👤 Stephen M. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:20
CPC Classifications
C; C07; C07C; C07C255/00; C07C25/00; C07C25/18; C07C43/00; C07C43/02; C07C43/20; C07C43/225; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/84; C07C53/00; C07C53/38; C07C53/44; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3028; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
86 words
In a liquid crystalline dielectric comprising at least two liquid crystalline compounds, the improvement wherein at least one of these compounds is a nematic compound with a negative dielectric anisotropy of the formula ##STR12## R 1 and R 2 are identical or different and each is alkyl of 1-12 carbon atoms, Z is a bridging group which is --CH 2 CH 2 --, --OCH 2 --, --O--CO-- or --CO--O-- and, one of X and Y is flourine, chlorine, bromine or cyano and the other is hydrogen.
Claim 2
Dependent Claim
86 words
In a liquid crystalline dielectric comprising at least two liquid crystalline compounds, the improvement wherein at least one of these compounds is a nematic compound with a negative dielectric anisotropy of the formula ##STR12## R 1 and R 2 are identical or different and each is alkyl of 1-12 carbon atoms, Z is a bridging group which is --CH 2 CH 2 --, --OCH 2 --, --O--CO-- or --CO--O-- and, one of X and Y is flourine, chlorine, bromine or cyano and the other is hydrogen.
Claim 3
Dependent Claim
59 words
A compound of the formula ##STR13## wherein R 1 and R 2 are identical or different and each is alkyl of 1-12 carbon atoms, Z is a bridging group which is --CH 2 CH 2 --, --OCH 2 --, --O--CO-- or --CO--O-- and, one of X and Y is fluorine, chlorine, bromine or cyano and the other is hydrogen.
Claim 4
Dependent Claim
59 words
A compound of the formula ##STR13## wherein R 1 and R 2 are identical or different and each is alkyl of 1-12 carbon atoms, Z is a bridging group which is --CH 2 CH 2 --, --OCH 2 --, --O--CO-- or --CO--O-- and, one of X and Y is fluorine, chlorine, bromine or cyano and the other is hydrogen.
Claim 5
Dependent Claim
14 words
A dielectric of claim 1, wherein R 1 or R 2 is straight chained.
Claim 6
Dependent Claim
16 words
A dielectric of claim 1, wherein R 1 or R 2 is a chiral branched group.
Claim 7
Dependent Claim
14 words
A dielectric of claim 1, wherein said nematic compound is of the formula ##STR14##
Claim 8
Dependent Claim
14 words
A dielectric of claim 1, wherein said nematic compound is of the formula ##STR15##
Claim 9
Dependent Claim
14 words
A dielectric of claim 1, wherein said nematic compound is of the formula ##STR16##
Claim 10
Dependent Claim
14 words
A dielectric of claim 1, wherein said nematic compound is of the formula ##STR17##
Claim 11
Dependent Claim
13 words
A dielectric of claim 1, wherein X is fluoro and Y is H.
Claim 12
Dependent Claim
18 words
A dielectric of claim 1, wherein Z is --CH 2 CH 2 --, --OCH 2 -- or --O--CO--.
Claim 13
Dependent Claim
14 words
A dielectric of claim 1, wherein R 1 is straight chain C 2-8 -alkyl.
Claim 14
Dependent Claim
9 words
A compound of claim 2 of the formula ##STR18##
Claim 15
Dependent Claim
9 words
A compound of claim 2 of the formula ##STR19##
Claim 16
Dependent Claim
9 words
A compound of claim 2 of the formula ##STR20##
Claim 17
Dependent Claim
20 words
In an electro-optical display element comprising a liquid crystalline dielectric, the improvement wherein the dielectric is one of claim 1.
Claim 18
Dependent Claim
18 words
A electrooptical display element of claim 15 which is a guest/host display element or a homotropicnematic display element.
Claim 19
Dependent Claim
15 words
A liquid crystalline dielectric of claim 7 wherein one of X and Y is F.
Claim 20
Dependent Claim
15 words
A liquid crystalline dielectric of claim 1 wherein one of X and Y is F.
Claim 21
Dependent Claim
9 words
A compound of claim 2 of the formula ##STR21##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |