US5167856A
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Ionophore-containing ferroelectric liquid crystal mixtures
Assignee: Hoechst AG
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Filing: 1991-04-10
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Granted: 1992-12-01
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Expires: 2011-04-10
Abstract
Abstract The occurrence of twist states in FLC displays can be suppressed by adding ionophores to FLC mixtures. Applicable ionophores are amides of the general formula I ##STR1## wherein R 1 , R 2 , R 3 and R 4 e.g. are alkyl, cyclohexyl, phenyl or benzyl and X is alkylene with --CH 2 -groups being replaced by --O--, 1,2-phenylene or 1,2-cyclohexylene.
Inventors
- 👤 Takamasa Harada
- 👤 Norbert Rosch
- 👤 Rainer Wingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/52; C09K19/58; C09K19/582
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
190 words
A ferroelectric liquid crystal mixture composed of at least two components, which contains as one component at least one ionophore of the general formula (I) ##STR9## in which R 1 ,R 2 ,R 3 ,R 4 , independently of one another, are alkyl of 1 to 15 carbon atoms, in which one --CH 2 -- group can be replaced by --CCO--, or --CO-- or one --CH 2 -- not adjacent to the N-atom by --O--, cyclohexyl, phenyl or benzyl, and X is an alkylene of 2 to 9 carbon atoms, in which one or two non-adjacent --CH 2 -- groups can be replaced by --O--, in which two adjacent --CH 2 -- groups can be replaced by 1,2-phenylene or 1,2-cyclohexylene, in which two adjacent --CH 2 -- groups can be replaced by CH(CH 3 )--CH(CH 3 )-- and in which a hydrogen atom of a CH 2 group can be substituted by R 5 or R 6 , in which R 5 is alkyl of 1 to 15 carbon atoms, R 6 is alkyl of 1 to 15 carbon atoms or CH 2 --O--CH 2 --CO--NR 1 R 2 .
Claim 2
Dependent Claim
190 words
A ferroelectric liquid crystal mixture composed of at least two components, which contains as one component at least one ionophore of the general formula (I) ##STR9## in which R 1 ,R 2 ,R 3 ,R 4 , independently of one another, are alkyl of 1 to 15 carbon atoms, in which one --CH 2 -- group can be replaced by --CCO--, or --CO-- or one --CH 2 -- not adjacent to the N-atom by --O--, cyclohexyl, phenyl or benzyl, and X is an alkylene of 2 to 9 carbon atoms, in which one or two non-adjacent --CH 2 -- groups can be replaced by --O--, in which two adjacent --CH 2 -- groups can be replaced by 1,2-phenylene or 1,2-cyclohexylene, in which two adjacent --CH 2 -- groups can be replaced by CH(CH 3 )--CH(CH 3 )-- and in which a hydrogen atom of a CH 2 group can be substituted by R 5 or R 6 , in which R 5 is alkyl of 1 to 15 carbon atoms, R 6 is alkyl of 1 to 15 carbon atoms or CH 2 --O--CH 2 --CO--NR 1 R 2 .
Claim 3
Dependent Claim
167 words
A ferroelectric liquid crystal mixture as claimed in claim 1, which contains at least one ionophore of the formula (I) in which R 1 ,R 2 ,R 3 ,R 4 , independently of one another, are alkyl of 1 to 15 carbon atoms, in which a --CH 2 --group can be replaced by --COO--, or one --CH 2 -- not adjacent to the N-atom by --O--, cyclohexyl or phenyl, and X is an alkylene of 2 to 9 carbon atoms, in which one or two non-adjacent --CH 2 -- groups can be replaced by --O--, in which two adjacent CH 2 groups can be replaced by 1,2-phenylene or 1,2-cyclohexylene, in which two adjacent --CH 2 -- groups can be replaced by --CH(CH 3 )--CH(CH 3 )-- and in which a hydrogen atom of a CH 2 group can be substituted by R 5 or R 6 , in which R 5 , R 6 , independently of one another, are alkyl of 1 to 15 carbon atoms.
Claim 4
Dependent Claim
114 words
A ferroelectric liquid crystal mixture as claimed in claim 1, which contains at least one ionophore of the general formula (I) in which R 1 ,R 2 ,R 3 ,R 4 , independently of one another, are alkyl of 1 to 15 carbon atoms, in which one --CH 2 -- group can be replaced by --COO--, or cyclohexyl, and X is an alkylene of 2 to 9 carbon atoms, in which one or two non-adjacent --CH 2 -- groups can be replaced by --O--, in which two adjacent CH 2 groups can be replaced by 1,2-phenylene, and in which two adjacent --CH 2 -- groups can be replaced by --CH(CH 3 )--CH(CH 3 )--.
Claim 5
Dependent Claim
42 words
A ferroelectric liquid crystal mixture as claimed in claim 1, which contains an ionophore of the general formula (I) in which -X- represents one of the following groups ##STR10## and R 1 to R 6 have the meanings mentioned in claim 1.
Claim 6
Dependent Claim
27 words
A ferroelectric liquid crystal mixture as claimed in claim 1 , wherein the mixture contains 0.01 to 10 mol % of a compound of the formula (I).
Claim 7
Dependent Claim
24 words
A ferroelectric liquid crystal mixture as claimed in claim 1 wherein the mixture contains two or more different compounds of the general formula (I).
Claim 8
Dependent Claim
47 words
A liquid crystal switching and display device, comprising a ferroelectric liquid-crystalline medium, support plates, electrodes, and at least one orientation layer wherein the ferroelectric liquid-crystalline medium is a ferroelectric liquid crystal which contains at least one compound of the general formula (I) as claimed in claim 1.
Claim 9
Dependent Claim
36 words
A liquid crystal switching and display device as claimed in claim 7, wherein the switching and display device is a surface stabilized ferroelectric liquid crystal cell having an FLC cell thickness of 1 to 20 μm.
Claim 10
Dependent Claim
19 words
A ferroelectric liquid crystal switching and display device, comprising a ferroelectric liquid crystal mixture as claimed in claim 1.
Claim 11
Dependent Claim
28 words
A surface stabilized ferroelectric liquid crystal cell having a cel thickness of 1 to 10 μm and comprising a ferroelectric liquid crystal mixture as claimed in claim 1.
References Cited (Backward Citations)
US4966726A
Cited
EP0385688A2
Cited
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