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US5178792A
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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 02:47
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.
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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) | 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 |