US4460770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal mixture
Assignee: F Hoffmann La Roche AG
•
Filing: 1982-06-10
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Granted: 1984-07-17
•
Expires: 2002-06-10
Abstract
Abstract There is described a liquid crystalline mixture for electro-optical devices which are operated according to the two-frequency matrix addressing procedure. The mixture consists of three components A, B and C, each of which contains one or more compounds. Component A has a viscosity of at most about 40 cp, a clearing point of at least about 40° C. and a dielectric anisotropy between about -2 and about +1. Component B has a dielectric anisotropy below about -2 and component C has a dielectric anisotropy above about +10, a clearing point of at least about 100° C. and there is a cross-over frequency in the total mixture of at most about 15 kHz at 20° C. Novel compounds for such mixtures and their manufacture and use are also described. The novel mixtures make possible especially high multiplex rates and short response times.
Inventors
- 👤 Martin Petrzilka
- 👤 Martin Schadt
- 👤 Alois Villiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:22
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
86 words
A compound of the formula ##STR15## wherein R 2 is hydrogen, fluorine, chlorine, bromine or cyano; Y is 2,2-dicyanovinyl, 2,2-dicyano-1-methylvinyl or cyano and A is 4'-R 1 -4-biphenylyl, p-(trans-4-R 1 -cyclohexyl)phenyl, p-(5-R 1 -2-pyrimidinyl)phenyl, p-[2-p'-R 1 -phenyl)ethyl]phenyl, p-[2-(trans-4-R 1 -cyclohexyl)ethyl]phenyl, trans-4-[2-(p-R 1 -phenyl)ethyl]cyclohexyl or trans-4-[2-(trans-4-R 1 -cyclohexyl)ethyl]cyclohexyl; and R 1 is straight-chain alkyl of 1 to 12 carbon atoms or when A is 4'-R 1 -4-biphenylyl, p-[2-(p'-R 1 -phenyl)ethyl]phenyl or trans-4-[2-(p-R 1 -phenyl)ethyl]cyclohexyl, R 1 also can be straight-chain alkoxy of 1 to 12 carbon atoms.
Claim 2
Dependent Claim
86 words
A compound of the formula ##STR15## wherein R 2 is hydrogen, fluorine, chlorine, bromine or cyano; Y is 2,2-dicyanovinyl, 2,2-dicyano-1-methylvinyl or cyano and A is 4'-R 1 -4-biphenylyl, p-(trans-4-R 1 -cyclohexyl)phenyl, p-(5-R 1 -2-pyrimidinyl)phenyl, p-[2-p'-R 1 -phenyl)ethyl]phenyl, p-[2-(trans-4-R 1 -cyclohexyl)ethyl]phenyl, trans-4-[2-(p-R 1 -phenyl)ethyl]cyclohexyl or trans-4-[2-(trans-4-R 1 -cyclohexyl)ethyl]cyclohexyl; and R 1 is straight-chain alkyl of 1 to 12 carbon atoms or when A is 4'-R 1 -4-biphenylyl, p-[2-(p'-R 1 -phenyl)ethyl]phenyl or trans-4-[2-(p-R 1 -phenyl)ethyl]cyclohexyl, R 1 also can be straight-chain alkoxy of 1 to 12 carbon atoms.
Claim 3
Dependent Claim
12 words
The compound of claim 1 wherein R 2 is cyano or chlorine.
Claim 4
Dependent Claim
10 words
The compound of claim 2 wherein R 2 is chlorine.
Claim 5
Dependent Claim
17 words
The compound of claim 1 wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms.
Claim 6
Dependent Claim
11 words
The compound of claim 1 wherein Y is 2,2-dicyano-1-methylvinyl or cyano.
Claim 7
Dependent Claim
12 words
The compound of claim 1 wherein A is 4'-alkyl-4-biphenylyl, p-(trans-4-alkylcyclohexyl)phenyl or p-[2-(trans-4-alkylcyclohexyl)ethyl]phenyl.
Claim 8
Dependent Claim
22 words
The compound of claim 1 wherein the alkyl and alkoxy groups for R 1 each are from 2 to 10 carbon atoms.
Claim 9
Dependent Claim
22 words
The compound of claim 7 wherein the alkyl and alkoxy groups in R 1 each are from 4 to 8 carbon atoms.
Claim 10
Dependent Claim
34 words
A compound of the formula ##STR16## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms and R 2 is fluorine, chlorine, bromine or cyano and A is 4'-alkyl-4-biphenylyl, p-(trans-4-alkylcyclohexyl)phenyl or p-(5-alkyl-2-pyrimidinyl)phenyl.
Claim 11
Dependent Claim
34 words
A compound of the formula ##STR16## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms and R 2 is fluorine, chlorine, bromine or cyano and A is 4'-alkyl-4-biphenylyl, p-(trans-4-alkylcyclohexyl)phenyl or p-(5-alkyl-2-pyrimidinyl)phenyl.
Claim 12
Dependent Claim
22 words
The compound of claim 9 wherein the alkyl and alkoxy groups for R 1 each are from 2 to 10 carbon atoms.
Claim 13
Dependent Claim
22 words
The compound of claim 10 wherein the alkyl and alkoxy groups in R 1 each are from 4 to 8 carbon atoms.
Claim 14
Dependent Claim
18 words
A compound of the formula ##STR17## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms.
Claim 15
Dependent Claim
18 words
A compound of the formula ##STR17## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms.
Claim 16
Dependent Claim
6 words
The compound 2-chloro-4-/[p-(4-heptylphenyl)benzoyl]oxy/benzoic acid p-(2,2-dicyano-1-methylvinyl)phenyl ester.
Claim 17
Dependent Claim
6 words
The compound 2-chloro-4-/[p-(4-heptylphenyl)benzoyl]oxy/benzoic acid p-(2,2-dicyano-1-methylvinyl)phenyl ester.
Claim 18
Dependent Claim
9 words
The compound of claim 1, 2-chloro-4-/[p-(2-(trans-4-heptylcyclohexyl)ethyl)benzoyl]oxy/benzoic acid p-(2,2-dicyano-1-methylvinyl)phenyl ester.
Claim 19
Dependent Claim
6 words
The compound 2-chloro-4-/[p-(4-heptylphenyl)benzoyl]oxy/benzoic acid p-cyanophenyl ester.
Claim 20
Dependent Claim
6 words
The compound 2-chloro-4-/[p-(4-heptylphenyl)benzoyl]oxy/benzoic acid p-cyanophenyl ester.
Claim 21
Dependent Claim
9 words
The compound of claim 1, 2-chloro-4-/[p-(2-(trans-4-heptylcyclohexyl)ethyl)benzoyl]oxy/benzoic acid p-cyanophenyl ester.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |