Patent EP0256636A2 successfully refreshed from Google Patents.
EP0256636A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Biphenylyl ethanes and their use in liquid crystal materials and devices
Assignee: Qinetiq Ltd
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Filing: 1987-06-17
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Granted: —
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Expires: 2007-06-17
Abstract
Abstract Novel compounds having a general formula: <CHEM> where m, n are 0 or 1, R1 represents hydrogen, alkyl, alkoxy, alkoxy substituted alkyl, alkanoyl, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy, <CHEM> represent cyclic groups, each of X, Y, Z is hydrogen or fluorine, at least one being fluorine, B is F, CL or CF3. Preferred compounds have a formula <CHEM> where R1 is C1-12 alkyl or alkoxy, B is fluorine. The compounds may be used as components of liquid crystal compositions, having a low viscosity and high clearing point.
Inventors
- 👤 George William Gray
- 👤 Kenneth Johnson Toyne
- 👤 David Lacey
- 👤 Eike Poetsch
- 👤 Georg Weber
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C07; C07C; C07C43/00; C07C43/02; C07C43/18; C07C43/192; C07C25/00; C07C25/18; C09K19/06; C09K19/08; C09K19/10; C09K19/14; C09K19/30; C09K19/3001; C09K19/3028; C09K19/32; C09K19/321; C09K19/34
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A compound suitable for use in liquid crystal materials having a formula: wherein: m represents 0 or 1; n represents 0 or 1; R 1 represents hydrogen or an alkyl, alkoxy, alkoxy substituted alkyl, alkanoyl, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy group; each of and represents a group selected from 1,4-disubstituted cyclohexane with the substituents in the trans-configuration; 1,4-disubstituted bicyclo (2,2,2) octane; 2,5-disubstituted 1,3-dioxan with the substituents in the trans-configuration; 1,4-disubstituted benzene optionally substituted with fluorine, eg in the 2 and/or 3 positions, 2,5-disubstituted 1,3 pyrimidine and 3,6-disubstituted 1,2 pyridazine; each of X, Y and Z represent hydrogen and fluorine in the 2,3,5 and 6 benzene ring positions provided that at least one of X, Y and Z represents fluorine in at least one ring position; and B represents a terminal group selected from: fluoro, chloro and CF 3 .
Claim 2
Dependent Claim
138 words
A compound suitable for use in liquid crystal materials having a formula: wherein: m represents 0 or 1; n represents 0 or 1; R 1 represents hydrogen or an alkyl, alkoxy, alkoxy substituted alkyl, alkanoyl, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy group; each of and represents a group selected from 1,4-disubstituted cyclohexane with the substituents in the trans-configuration; 1,4-disubstituted bicyclo (2,2,2) octane; 2,5-disubstituted 1,3-dioxan with the substituents in the trans-configuration; 1,4-disubstituted benzene optionally substituted with fluorine, eg in the 2 and/or 3 positions, 2,5-disubstituted 1,3 pyrimidine and 3,6-disubstituted 1,2 pyridazine; each of X, Y and Z represent hydrogen and fluorine in the 2,3,5 and 6 benzene ring positions provided that at least one of X, Y and Z represents fluorine in at least one ring position; and B represents a terminal group selected from: fluoro, chloro and CF 3 .
Claim 3
Dependent Claim
19 words
A compound according to claim 1, having a formula: where at least one of X and Y is fluorine.
Claim 4
Dependent Claim
22 words
A compound according to claim 1 or 2 characterised in that R 1 is Ci-12 alkyl or alkoxy and B is fluorine.
Claim 5
Dependent Claim
13 words
A compound according to claim 3 characterised in that R 1 is n-alkyl.
Claim 6
Dependent Claim
9 words
A compound according to claim 4 having a formula
Claim 7
Dependent Claim
15 words
A compound according to claim 5 characterised in that R 1 contains 2-6 carbon atoms.
Claim 8
Dependent Claim
9 words
A compound according to claim 4 having a formula
Claim 9
Dependent Claim
13 words
A compound according to claim 7 characterised in that R 1 is n-propyl.
Claim 10
Dependent Claim
28 words
A liquid crystal material having at least two components characterised in that at least one component is a compound as claimed in any one of the preceding claims.
Claim 11
Dependent Claim
24 words
A liquid crystal material according to claim 9 characterised in that it contains a compound of formula where R and R' are alkyl groups.
Claim 12
Dependent Claim
20 words
A liquid crystal electro-optical display device characterised in that it incorporates a material as claimed in claim 9 or 10.
References Cited (Backward Citations)
No citation records indexed.
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