EP0206228A2
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EP
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Ferroelectric chiral smetic liquid crystal composition and light switching element
Assignee: JNC Corp
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Filing: 1986-06-18
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Granted: —
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Expires: 2006-06-18
Abstract
Abstract @ A ferroelectric chiral smectic liquid crystal composition affording a high response speed and being cheap so that a high speed switching can be effected, which composition comprises at least one achiral smectic C compound and at least one chiral smectic C compound, characterized in that at least one of said at least one achiral smectic C compound contains at least two divalent six-membered rings, directly linked by at least one single bond, at least one of said at least two divalent six-membered rings being selected from pyrimidin-2,5-diyl, pyridin-2,5-diyl, 1,4-phenylene or trans-1,4-cyclohexylene. A light switching element using the above chiral smetic liquid crystal composition is also provided.
Inventors
- 👤 Kenji Furukawa
- 👤 Kanetsugu Terashima
- 👤 Mitsuyoshi Ichihashi
- 👤 Makoto Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
1, A ferroelectric chiral smectic liquid crystal composition comprising at least one achiral smectic C compound and at least one chiral smectic C compound, characterized in that at least one of said at least one achiral smectic C compound contains at least two divalent six-membered rings, directly linked by at least one single bond, at least one of said at least two divalent six-membered rings being selected from pyrimidin-2,5-diyl, pyridin-2,5-diyl, 1,4-phenylene or trans-l,4-cyclohexylene.
Claim 2
Dependent Claim
73 words
1, A ferroelectric chiral smectic liquid crystal composition comprising at least one achiral smectic C compound and at least one chiral smectic C compound, characterized in that at least one of said at least one achiral smectic C compound contains at least two divalent six-membered rings, directly linked by at least one single bond, at least one of said at least two divalent six-membered rings being selected from pyrimidin-2,5-diyl, pyridin-2,5-diyl, 1,4-phenylene or trans-l,4-cyclohexylene.
Claim 3
Dependent Claim
69 words
A ferroelectric chiral smectic liquid crystal composition according to claim 1 wherein said at least one achiral smectic C compound is a compound expressed by the formula wherein independently represent benzene ring or cyclohexane ring; ℓ, m and n independently represent 0 or 1; and R i and R 2 independently represent an alkyl group, an alkoxy group or an alkanoyloxy group each of 1 to 18 carbon atoms.
Claim 4
Dependent Claim
44 words
A ferroelectric chiral smectic liquid crystal composition according to claim 1 wherein said at least one achiral smectic C compound is a compound expressed by the formula wherein R 3 and R 4 independently represent an alkyl group of 1 to 18 carbon atoms.
Claim 5
Dependent Claim
73 words
A ferroelectric chiral smectic liquid crystal composition according to claim 1 wherein said at least one achiral smectic C compound is a compound expressed by the formula wherein X represents a covalent bond or -O-; n represents an integer of 0 to 10; R 5 represents an alkyl group or an alkoxy group each of 1 to 18 carbon atoms; and R 6 represents an alkyl group of 2 to 18 carbon atoms.
Claim 6
Dependent Claim
110 words
A ferroelectric chiral smectic liquid crystal composition according to claim 1 wherein said at least one chiral smectic C compound is a compound expressed by the formula wherein 1 and m independently represent an integer of 1 or 2; Y represents -COO-, -CH= N -, -CH 2 O-, -OCO-, -N= CH -, -OCH 2 - or a single bond; and R 7 and R 8 each represent an alkyl group, an alkoxy group, an alkoxycarbonyl group, an alkanoyl group or an alkanoyloxy group each of 1 to 18 carbon atoms, and at least one of R 7 and R 8 contains an asymmetric carbon atom at its alkyl chain part.
Claim 7
Dependent Claim
106 words
A ferroelectric chiral smectic liquid crystal composition according to claim 2 wherein said at least one chiral smectic C compound is a compound expressed by the formula wherein ℓ and m independently represent an integer of 1. or 2; Y represents -COO-, -CH=N-, -CH 2 O-, -OCO-, -N=CH-, -OCH 2 - or a single bond; and R 7 and R 8 each represent an alkyl group, an alkoxy group, an alkoxycarbonyl group, an alkanoyl group or an alkanoyloxy group each of 1 to 18 carbon atoms, and at least one of R 7 and R 8 contains an asymmetric carbon atom at its alkyl chain part.
Claim 8
Dependent Claim
105 words
A ferroelectric chiral smectic liquid crystal composition according to claim 3 wherein said at least one chiral smectic C compound is a compound expressed by the formula wherein ℓ and m independently represent an integer of 1 or 2; Y represents -COO-, -CH=N-, -CH 2 0-, -OCO-, -N=CH-, -OCH 2 - or a single bond; and R and R 8 each represent an alkyl group, an alkoxy group, an alkoxycarbonyl group, an alkanoyl group or an alkanoyloxy group each of 1 to 18 carbon atoms, and at least one of R 7 and R 8 contains an asvmmetric carbon atom at its alkyl chain part.
Claim 9
Dependent Claim
109 words
A ferroelectric chiral smectic liquid crystal composition according to claim 4 wherein said at least one chiral smectic C compound is a compound expressed by the formula wherein ℓ and m independently represent an integer of 1 or 2; Y represents -COO-, -CH= N -, -CH 2 0-, -OCO-, -N=CH-, - OCH 2 - or a single bond; and R 7 and R 8 each represent an alkyl groups an alkoxy group, an alkoxycarbonyl group, an alkanoyl group or an alkanoyloxy group each of 1 to 18 carbon atoms, and at least one of R 7 and R 8 contains an asymmetric carbon atom at its alkyl chain part.
Claim 10
Dependent Claim
59 words
A ferroelectric chiral smectic liquid crystal composition according to claim 1 wherein said at least one chiral smectic C compound comprises at least two compounds of at least one ferroelectric chiral smectic C liquid crystal compound having a helical twist sense right-handed and at least one ferroelectric chiral smectic C liquid crystal compound having a helical twist sense left-handed.
Claim 11
Dependent Claim
18 words
A light switching element using a ferroelectric chiral smectic liquid crystal composition as set forth in claim 1.
References Cited (Backward Citations)
No citation records indexed.
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