US4997591A
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Chiral smetic liquid crystals and glassy materials containing the same for displaying and storing information
Assignee: Hoechst AG
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Filing: 1989-08-11
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Granted: 1991-03-05
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Expires: 2009-08-11
Abstract
Abstract The chiral smetic liquid-crystalline compounds of the general formula (I) M.sub.1.sup.* --B--M.sub.2.sup.* (I) solidify on cooling from the liquid-crystalline phase in glassy form, as a result of which they are suitable for materials for displaying and storing information. Such materials may be used in electro-optic data stores or display components which are based on the ferroelectric or electroclinic switching effect in a chiral or chirally doped, smetic liquid-crystalline phase. In the general formula, M 1 * , M 2 * stand for chiral smetogenic groups and --B-- is, as bridging link, a typical bivalent group.
Inventors
- 👤 Gerd Heppke
- 👤 Feodor Oestreicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:18
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C09K19/02; C09K19/0225; C09K19/0233; C09K19/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A chiral smectic liquid-crystalline compound of the general formula (I) M.sup.* .sub.1 --B--M.sup.* .sub.2 (I) in which M * 1 , M * 2 are, independently of each other, but in particular, identical chiral smectogenic groups and the bridging link --B-- stands for a bivalent group, and which simultaneously solidify in a glassy form from the liquid-crystalline phase on cooling.
Claim 2
Dependent Claim
60 words
A chiral smectic liquid-crystalline compound of the general formula (I) M.sup.* .sub.1 --B--M.sup.* .sub.2 (I) in which M * 1 , M * 2 are, independently of each other, but in particular, identical chiral smectogenic groups and the bridging link --B-- stands for a bivalent group, and which simultaneously solidify in a glassy form from the liquid-crystalline phase on cooling.
Claim 3
Dependent Claim
26 words
A glassy material for displaying and storing information which contains such compounds of the general formula (I) as claimed in claim 1 or is composed thereof.
Claim 4
Dependent Claim
40 words
An electro-optic data store or electro-optic display component based on the ferroelectric or electroclinic switching effect in a chiral or chirally doped, smectic liquid-crystalline phase having a content of compounds of the general formula (I) as claimed in claim 1.
Claim 5
Dependent Claim
117 words
A compound as claimed in claim 1 having the following meaning of the symbols: ##STR5## where R denotes a straight-chain or branched alkyl radical from C 1 to C 16 or an alkenyl radical from C 2 to C 16 which may also be substituted by F, Cl and/or CN, or in which 1 or 2 nonadjacent carbon atoms (from carbon atom 2 after the CH * ) may also be replaced by --O--, --S--, --O--CO--, --CO--O--, --S--CO-- or --CO--S--, --Ch * -- denotes a bivalent chiral group which effects a high spontaneous polarization in the molecule, such as --CHCl--, --CHF-- or ##STR6## and --Z-- denotes --CO-- or (--CH 2 ) n --, where n=1 to 8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |