US4566759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laterally fluorinated liquid crystal materials and frequency change devices
Assignee: UK Secretary of State for Defence
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Filing: 1984-04-24
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Granted: 1986-01-28
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Expires: 2004-04-24
Abstract
Abstract A liquid crystal composition suitable for use as a two-frequency material in a two-frequency switching device comprises a mixture of: a first component comprising at least one diester compound having a formula: ##STR1## where R 1 is an alkyl or alkoxy group, Z is an cycloalkyl or aryl ring structure and R 2 is alkyl, alkoxy or halogen; or CN; and a second component comprising at least one compound having a formula: ##STR2## wherein R 3 and R 4 is each independently an alkyl or alkoxy group, ##STR3## is a trans-1,4-disubstituted cyclohexane or a benzene ring, Y is a cycloalkyl ring or a benzene ring optionally having a lateral halogen substituent and n is 0 or 1.
Inventors
- 👤 Damien G. McDonnell
- 👤 Robert A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:42
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/32; C09K19/321; C09K19/44
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
A liquid crystal composition suitable for use as a two-frequency material in a two-frequency switching device, the composition comprising a mixture of: i. a first component A having a positive dielectric anisotropy and consisting of one or more compounds having a general formula: ##STR76## wherein R 1 and R 2 are independently n-alkyl groups having from 3 to 7 carbon atoms; and Z is selected from 1,4-phenylene, trans-1,4-cyclohexyl, and 2,6-naphthyl; and ii. a second component B having a low viscosity and consisting of one or more compounds having a general formula: ##STR77## wherein R 3 and R 4 are independently n-alkyl groups having from 3 to 7 carbon atoms.
Claim 2
Dependent Claim
109 words
A liquid crystal composition suitable for use as a two-frequency material in a two-frequency switching device, the composition comprising a mixture of: i. a first component A having a positive dielectric anisotropy and consisting of one or more compounds having a general formula: ##STR76## wherein R 1 and R 2 are independently n-alkyl groups having from 3 to 7 carbon atoms; and Z is selected from 1,4-phenylene, trans-1,4-cyclohexyl, and 2,6-naphthyl; and ii. a second component B having a low viscosity and consisting of one or more compounds having a general formula: ##STR77## wherein R 3 and R 4 are independently n-alkyl groups having from 3 to 7 carbon atoms.
Claim 3
Dependent Claim
20 words
A composition as claimed in claim 1, wherein component A comprises from 50 to 60% by weight of the composition.
Claim 4
Dependent Claim
27 words
A composition as claimed in claim 1, which additionally comprises: iii. a high clearing point additive, component C, forming up to 20% by weight of the composition.
Claim 5
Dependent Claim
44 words
A composition as claimed in claim 3, wherein component A forms from 50 to 60% by weight of the composition, component B forms from 35 to 40% by weight of the composition, and component C forms up to 10% by weight of the composition.
Claim 6
Dependent Claim
30 words
A composition as claimed in claim 3, wherein component C comprises one or more compounds having a formula: ##STR78## wherein each R is independently n-alkyl and ##STR79## represents either ##STR80##
Claim 7
Dependent Claim
31 words
A composition as claimed in claim 1, which additionally comprises an additional component comprising one or more strongly negative compounds having a negative dielectric anisotropy with a magnitude greater than 3.
Claim 8
Dependent Claim
35 words
A composition as claimed in claim 1, wherein Z is 1,4-phenylene, R 2 is n-C 5 H 11 , and R 1 is selected from n-C 5 H 11 and n-C 3 H 7 .
Claim 9
Dependent Claim
37 words
A composition as claimed in claim 1, wherein R 4 is n-C 5 H 11 and R 3 is selected from n-C 3 H 7 , n-C 5 H 11 , and n-C 7 H 15 .
Claim 10
Dependent Claim
12 words
A composition as claimed in claim 1, wherein component A comprises: ##STR81##
Claim 11
Dependent Claim
45 words
A composition as claimed in claim 1, which is a mixture of the following compounds in at least approximately the stated percentages by weight of the overall mixture: ______________________________________
Compound %
______________________________________
##STR82## 24
##STR83## 32
##STR84## 9.5
##STR85## 15
##STR86## 13
##STR87## 6.5.
______________________________________
Claim 12
Dependent Claim
45 words
A composition as claimed in claim 1, which is a mixture of the following compounds in at least approximately the stated percentages by weight of the overall mixture: ______________________________________
Compound %
______________________________________
##STR88## 27
##STR89## 29
##STR90## 9.5
##STR91## 15
##STR92## 13
##STR93## 6.5.
______________________________________
Claim 13
Dependent Claim
43 words
A composition as claimed in claim 1, which is a mixture of the following compounds in at least approximately the stated percentages by weight of the overall mixture: ______________________________________
Compound %
______________________________________
##STR94## 29
##STR95## 31
##STR96## 10
##STR97## 16
##STR98## 14.
______________________________________
Claim 14
Dependent Claim
113 words
A liquid crystal device comprising two dielectric substrates at least one of which is optically transparent, a layer of liqud crystal material sandwiched between the substrates and electrodes on the inner surfaces of the substrates to enable an electric field to be applied across the layer of liquid crystal material to provide an electrooptic effect therein, the device also including means for switching the frequency of electric fields applied between the electrodes on the respective substrate inner surfaces to cause the dielectric anisotropy of liquid crystal material to be switched between states giving different optical response, and wherein the improvement comprises the liquid crystal material being a composition as claimed in claim 1.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |