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US4886620A
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Smectic liquid-crystalline phases
Assignee: Hoechst AG
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Filing: 1986-09-15
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Granted: 1989-12-12
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Expires: 2006-09-15
Abstract
Abstract The invention relates to the use of compounds of the formula I R.sup.1 --Q.sup.1 --A--(A.sup.2).sub.q --R.sup.2 I wherein ##STR1## and R 1 , R 2 , Q 1 , Q 2 and q have the meaning specified in claim 1, as components of smectic liquid-crystalline phases, and also smectic liquid-crystalline phases, in particular chiral tilted smectic phases containing compounds of formula I.
Inventors
- 👤 Reinhard Hopf
- 👤 Bernhard Scheuble
- 👤 Andreas Wachtler
- 👤 Reinhard Hittich
- 👤 Rudolf Eidenschink
- 👤 Thomas Geelhaar
- 👤 Joachim Krause
- 👤 Volker Reiffenrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:37
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/36; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3003; C09K19/3066; C09K19/3068; C09K19/32; C09K19/322; C09K19/34; C09K19/3441; C09K19/3444; C09K19/345; C09K19/3452; C09K19/3455; C09K19/3458; C09K19/42; C09K2019/325; C09K2019/326
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
In a liquid crystal phase having ferroelectric properties useful for rapidly switching displays and comprising at least two liquid crystalline compounds which form an achiral base mixture having a tilted smectic phase, and a chiral doping substance, the improvement wherein at least one compound of the achiral base mixture is of the formula wherein R 1 and R 2 are each independently of each other an alkyl group or a polyfluoroalkyl group containing 1 to 15 C atoms in each case, wherein one or more CH 2 groups or CF 2 groups may also be replaced by a group selected from the group consisting of --O--, --S--, --CO--, --CHhalogen--, --CHCN--, --O--CO--, --O--COO--, --CO--O-- and --CH═CH-- or else by a combination of two suitable said groups, two hetero atoms not being directly linked to each other; A° is unsubstituted 1,4-phenylene or 1,4-phenylene substituted singly or multiply by halogen atoms wherein one or more CH groups may also be replaced by N (Ph); Z° denotes --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 -- or a single bond; and P denotes 2 or 3.
Claim 2
Dependent Claim
186 words
In a liquid crystal phase having ferroelectric properties useful for rapidly switching displays and comprising at least two liquid crystalline compounds which form an achiral base mixture having a tilted smectic phase, and a chiral doping substance, the improvement wherein at least one compound of the achiral base mixture is of the formula wherein R 1 and R 2 are each independently of each other an alkyl group or a polyfluoroalkyl group containing 1 to 15 C atoms in each case, wherein one or more CH 2 groups or CF 2 groups may also be replaced by a group selected from the group consisting of --O--, --S--, --CO--, --CHhalogen--, --CHCN--, --O--CO--, --O--COO--, --CO--O-- and --CH═CH-- or else by a combination of two suitable said groups, two hetero atoms not being directly linked to each other; A° is unsubstituted 1,4-phenylene or 1,4-phenylene substituted singly or multiply by halogen atoms wherein one or more CH groups may also be replaced by N (Ph); Z° denotes --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 -- or a single bond; and P denotes 2 or 3.
Claim 3
Dependent Claim
25 words
A liquid crystal phase according to claim 1, wherein R 1 is straight-chain alkoxy, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy each having 5 to 12 C atoms.
Claim 4
Dependent Claim
20 words
A liquid crystal phase according to claim 1, wherein R 2 is straight-chain alkyl of 5 to 12 C atoms.
Claim 5
Dependent Claim
12 words
A liquid crystal phase according to claim 1, wherein p is 2.
Claim 6
Dependent Claim
28 words
A liquid crystal phase according to claim 1, wherein (A°-Z°) p is selected from the following formulae ##STR43## ##STR44## wherein the formula ##STR45## represents 2- or 2'-fluoro biphenylene
Claim 7
Dependent Claim
24 words
In a ferroelectric electrooptical display element comprising a liquid crystal phase having ferroelectric properties, the improvement wherein said phase is one of claim 1.
Claim 8
Dependent Claim
14 words
A ferroelectric display element of claim 6 capable of operating by the SSFLC mechanism.
Claim 9
Dependent Claim
25 words
A liquid crystal phase according to claim 1, wherein (A°-Z°) p is selected from the following formulae ##STR46## and Z° is not a direct bond.
Claim 10
Dependent Claim
179 words
In a liquid crystal phase having ferroelectric properties useful for rapidly switching displays and comprising at least two liquid crystalline compounds which form an achiral base mixture having a tilted smectic phase, and a chiral doping substance, the improvement wherein at least one compound of the achiral base mixture is of the formula ##STR47## wherein R 1 and R 2 are each independently of each other an alkyl group containing 1 to 15 C atoms in each case, wherein one or more CH 2 groups may also be replaced by a group selected from the grouping consisting of --O--, --S--, --CO--, --CHhalogen--, --CHCN--, --O--CO--, --O--COO--, --CO--O-- and --CH═CH-- or else by a combination of two suitable said groups, two hetero atoms not being directly linked to each other; A is unsubstituted 1,4-phenylene or 1,4-phenylene substituted singly or multiply by halogen atoms wherein one or more CH groups may also be replaced by N (Ph); Z denotes --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 --, or a single bond; and P denotes 2 or 3.
Claim 11
Dependent Claim
179 words
In a liquid crystal phase having ferroelectric properties useful for rapidly switching displays and comprising at least two liquid crystalline compounds which form an achiral base mixture having a tilted smectic phase, and a chiral doping substance, the improvement wherein at least one compound of the achiral base mixture is of the formula ##STR47## wherein R 1 and R 2 are each independently of each other an alkyl group containing 1 to 15 C atoms in each case, wherein one or more CH 2 groups may also be replaced by a group selected from the grouping consisting of --O--, --S--, --CO--, --CHhalogen--, --CHCN--, --O--CO--, --O--COO--, --CO--O-- and --CH═CH-- or else by a combination of two suitable said groups, two hetero atoms not being directly linked to each other; A is unsubstituted 1,4-phenylene or 1,4-phenylene substituted singly or multiply by halogen atoms wherein one or more CH groups may also be replaced by N (Ph); Z denotes --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 --, or a single bond; and P denotes 2 or 3.
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