EP0136725A2
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EP
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Ferroelectric chiral smectic liquid crystal composition and light switching element
Assignee: JNC Corp
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Filing: 1984-10-05
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Granted: —
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Expires: 2004-10-05
Abstract
Abstract A ferroelectric liquid crystal material having a long helical pitch and still having a large spontaneous electric polarization and superior response property can be provided by mixing a chiral smectic compound or compounds having a twist sense of helix right-handed with other chiral smectic compound or compounds having a twist sense of helix left-handed and also a light switching element is provided in which the above-mentioned ferroelectric chiral smectic liquid crystal composition is used.
Inventors
- 👤 Kenji Furukawa
- 👤 Kanetsugu Terashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 01:32
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/02; C09K19/0225; C09K19/12; C09K19/126; C09K19/22; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
A ferroelectric chiral smectic liquid crystal composition comprising, respectively, one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix right-handed and one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix left-handed.
Claim 2
Dependent Claim
44 words
A ferroelectric chiral smectic liquid crystal composition comprising, respectively, one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix right-handed and one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix left-handed.
Claim 3
Dependent Claim
117 words
A ferroelectric chiral smectic liquid crystal composition according to the Claim I wherein the chiral smectic liquid crystal compound having a twist sense of helix right-handed and not forming a racemate, is expressed by a general formula wherein m or n is an integer of L or 2; X is -CH=N-,-CH 2 O-, , -N=CH-, ,-OCH 2 - or a single bondg R is an alkyl or alkoxy group of 1-18 carbon atoms; Y is an alkyl, alkoxy, alkoxy carbonyl, alkanoyl or alkanoyloxy group, each having an asymmetrical carbon atom and other chiral smectic liquid crystal compound having a twist sense of helix left-handed is expressed by the general formula (I) and does not form a racemate.
Claim 4
Dependent Claim
88 words
A ferroelectric chiral smectic liquid crystal composition having a helical pitch of 2 µm or more according to Claim 2 wherein a chiral smectic liquid crystal compound having a twist sense of helix right-handed is an optically active compound in which the side chain Y of the general formula (I) of Claim 2 is and a chiral smectic liquid crystal compound having a twist sense of helix left-handed is an optically active compound in which the side chain Y of the general formula (I) of Claim 2 is
Claim 5
Dependent Claim
88 words
A ferroelectric chiral smectic liquid crystal composition having a helical pitch of 2 µm or more according to Claim 2 wherein a chiral smectic liquid crystal compound having a twist sense of helix right-handed is an optically active compound in which the side chain Y of the general formula (I) of Claim 2 is and a chiral smectic liquid crystal compound having a twist sense of helix left-handed is an optically active compound in which the side chain Y of the general formula (I) of Claim 2 is
Claim 6
Dependent Claim
87 words
A ferroelectric chiral smectic liquid crystal composition having a helical pitch of 2 µm or more according: to Claim 2 wherein a chiral smectic liquid crystal compound having a twist sense of helix right-handed is an optically active compound in which the side chain Y of the general formula (I) of Claim 2 is and a chiral smectic liquid crystal compound having a twist sense of helix left-handed is an optically active compound in which the side chain Y of the formula (I) of Claim 2 is
Claim 7
Dependent Claim
55 words
A light switching element which is characterized in the use of a ferroelectric chiral smectic liquid crystal composition comprising, respectively, one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix right-handed and one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix left-handed-
Claim 8
Dependent Claim
55 words
A light switching element which is characterized in the use of a ferroelectric chiral smectic liquid crystal composition comprising, respectively, one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix right-handed and one or more kinds of chiral smectic liquid crystal compound having a twist sense of helix left-handed-
References Cited (Backward Citations)
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