US5178792A
Expired / Lapsed
US
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Macrocyclic compounds as component for ferroelectric liquid crystal mixtures
Assignee: Hoechst AG
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Filing: 1991-04-10
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Granted: 1993-01-12
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Expires: 2011-04-10
Abstract
Abstract A liquid crystal mixture composed of at least two components containing as one component a macrocyclic compound of the general formula (1) <IMAGE> (1) in which a, b, c, d, e, f, independently of one another, are an integer from zero to 4, a+b+c+d+e+f being greater than 7, and -A-, -B-, -C-, -D-, -E-, -F-, identical or different, are, for example, -CH2-, -CH=CH-, -CO- or -COO-, leads in FLC displays to the formation of a uniform alignment and avoids twist states, which is reflected in a significantly improved contrast.
Inventors
- 👤 Takamasa Harada
- 👤 Norbert Rosch
- 👤 Peter Wegener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:40
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582; C09K19/584; C09K19/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A ferroelectric liquid crystal mixture composed of at least two components, which contains as one component at least one macrocyclic compound of the general formula ( 1) ##STR31## in which a, b, c, d, e, f, independently of one another, are an integer from zero to 4, a+b+c+d+e+f being greater than 7, and --A--, --B--, --C--, --D--, --E--, --F--, identical or different, are ##STR32## in which R can be alkyl of 1 to 12 carbon atoms, and R' can be alkyl of 1 to 12 carbon atoms, in which a --CH 2 -- group can be replaced by --O, --COO--or --OCO--, phenyl or Cl, F or CN.
Claim 2
Dependent Claim
107 words
A ferroelectric liquid crystal mixture composed of at least two components, which contains as one component at least one macrocyclic compound of the general formula ( 1) ##STR31## in which a, b, c, d, e, f, independently of one another, are an integer from zero to 4, a+b+c+d+e+f being greater than 7, and --A--, --B--, --C--, --D--, --E--, --F--, identical or different, are ##STR32## in which R can be alkyl of 1 to 12 carbon atoms, and R' can be alkyl of 1 to 12 carbon atoms, in which a --CH 2 -- group can be replaced by --O, --COO--or --OCO--, phenyl or Cl, F or CN.
Claim 3
Dependent Claim
48 words
A liquid crystal mixture as claimed in claim 1, wherein the symbols in formula (1) have the following meaning: a, b, c, d, e, f, R, R' are as in claim 1, --B--, --C--, --E--, --F-- are --CH 2 -- and --A--, --D--, identical or different, are ##STR33##
Claim 4
Dependent Claim
74 words
A liquid crystal mixture as claimed in claim 1, wherein the symbols in formula (1) have the following meaning: a, b, c, d, e, f, independently of one another, are an integer from zero to 3, --B--, --C--, --E--, --F-- are --CH 2 -- --A--, --D--, identical or different, are ##STR34## in which R is alkyl of 1 to 12 carbon atoms and R' is alkyl of 1 to 12 carbon atoms or phenyl.
Claim 5
Dependent Claim
26 words
A liquid crystal mixture as claimed in claim 3, wherein the symbols in formula (1) have the following meaning: --A--, --D--, identical or different, are ##STR35##
Claim 6
Dependent Claim
25 words
A liquid crystal mixture as claimed in claim 1, which contains 0.01 to 10 mol % of the macrocyclic compound of the general formula (1).
Claim 7
Dependent Claim
48 words
An electrooptical switching and display device containing a ferroelectric liquid crystal mixture, two electrodes, two support blades and at least one orientation layer, which contains an ferroelectric liquid crystal mixture containing as one component 0.01 to 10 mol % of a macrocyclic compound as claimed in claim 1.
References Cited (Backward Citations)
FR2344617A1
Cited
US4077900A
Cited
US4367924A
Cited
US4918217A
Cited
US5020881A
Cited
EP0350842A2
Cited
WO1990015117A1
Cited
DE3939697A1
Cited
WO1991008272A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |