US4414131A
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Guest-host liquid crystalline composition
Assignee: MERECK PATENT FRANKFURTER STRASSE 250 6100 DARMSTADT A Co OF GERMANY GmbH
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Filing: 1983-01-13
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Granted: 1983-11-08
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Expires: 2003-01-13
Abstract
Abstract A novel nematic liquid crystalline composition is provided. A novel liquid crystalline chiral compound, (+)5-(2-methyl) butyl-2(4-cyanophenyl)-1, 3-dioxane, is also provided. When admixed together, these novel components form a phase-change cholesteric liquid crystalline composition which is highly useful as the host medium in a guest-host electrooptical display as a result of its low electrical threshold and optical saturation voltages, steep saturation curve, relatively low optical birefringence, low viscosity and broad liquid crystalline mesomorphic range. The host medium in conjunction with a suitable pleochroic dye provides an improved guest-host composition which exhibits a contrast of greater than 3:1 in certain displays, especially those having liquid crystal alignment layer means providing a moderate tilt angle of 10°-40° at the substrate/guest-host composition interface.
Inventors
- 👤 Nicholas L. Sethofer
- 👤 Michael C. Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:54
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C07; C07D; C07D319/00; C07D319/04; C07D319/06; C09K19/52; C09K19/60; C09K19/601; C09K2019/3422
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds: trans-alkyl pentylcyclohexyl dioxanes, trans-alkyl cyanophenyl dioxanes, trans-alkyl pentylcyclohexyl cyclohexyl dioxanes, trans-alkyl alkylcyclohexyl phenyl dioxanes and trans-cyanophenyl alkyl dioxanyl benzoates, (b) a chiral nematic compound having the formula: ##STR33## (c) a guest pleochroic dye.
Claim 2
Dependent Claim
52 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds: trans-alkyl pentylcyclohexyl dioxanes, trans-alkyl cyanophenyl dioxanes, trans-alkyl pentylcyclohexyl cyclohexyl dioxanes, trans-alkyl alkylcyclohexyl phenyl dioxanes and trans-cyanophenyl alkyl dioxanyl benzoates, (b) a chiral nematic compound having the formula: ##STR33## (c) a guest pleochroic dye.
Claim 3
Dependent Claim
61 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds in weight percent: ______________________________________
##STR34## 10.0
##STR35## 8.0
##STR36## 20.0
##STR37## 14.0
##STR38## 17.0
##STR39## 14.0
##STR40## 8.0
##STR41## 5.0
##STR42## 1.5
##STR43## 1.3
##STR44## 1.2,
______________________________________ (b) a chiral nematic compound having the formula ##STR45## and (c) a guest pleochroic dye.
Claim 4
Dependent Claim
61 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds in weight percent: ______________________________________
##STR34## 10.0
##STR35## 8.0
##STR36## 20.0
##STR37## 14.0
##STR38## 17.0
##STR39## 14.0
##STR40## 8.0
##STR41## 5.0
##STR42## 1.5
##STR43## 1.3
##STR44## 1.2,
______________________________________ (b) a chiral nematic compound having the formula ##STR45## and (c) a guest pleochroic dye.
Claim 5
Dependent Claim
61 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds in weight percent: ______________________________________
##STR46## 5-25%
##STR47## 5-25%
##STR48## 10-30%
##STR49## 10-30%
##STR50## 10-30%
##STR51## 10-30%
##STR52## 5-25%
##STR53## 5-25%
##STR54## 1-5%
##STR55## 1-5%
##STR56## 1-5%
______________________________________ (b) a chiral nematic compound having the formula ##STR57## and (c) a guest pleochroic dye.
Claim 6
Dependent Claim
61 words
A guest/host nematic liquid crystalline composition having low optical birefringence and low threshold voltage comprising: (a) host nematic compounds in weight percent: ______________________________________
##STR46## 5-25%
##STR47## 5-25%
##STR48## 10-30%
##STR49## 10-30%
##STR50## 10-30%
##STR51## 10-30%
##STR52## 5-25%
##STR53## 5-25%
##STR54## 1-5%
##STR55## 1-5%
##STR56## 1-5%
______________________________________ (b) a chiral nematic compound having the formula ##STR57## and (c) a guest pleochroic dye.
Claim 7
Dependent Claim
42 words
The composition of claim 1 in which said trans-alkyl pentylcyclohexyl dioxanes is trans ##STR58## said trans-alkyl cyanophenyl dioxanes are ##STR59## said trans-alkyl pentylcyclohexyl cyclohexyl dioxanes is ##STR60## said trans-alkyl alkylcyclohexyl phenyl dioxanes are ##STR61## and said trans-cyanophenyl alkyl dioxanyl benzoates are ##STR62##
Claim 8
Dependent Claim
18 words
The composition of claim 1, 2, 3, or 4 in which said pleochroic dye has the formula: ##STR63##
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |