US4882086A
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Ferroelectric liquid crystal composition
Assignee: JNC Corp
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Filing: 1989-01-19
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Granted: 1989-11-21
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Expires: 2009-01-19
Abstract
Abstract A ferroelectric liquid crystal composition exhibiting SC* phase within a broad temperature range including room temperature and yet having cholesteric phase and further high-speed response properties and a light switching element using the above composition and having high-speed response properties are provided, which composition comprises an achiral compound expressed by the formula ##STR1## wherein R 1 and R 2 each represent the same or different linear or branched chain alkyl group of 1 to 18 carbon atoms, in 20 to 70% by weight and having cholesteric phase; and which composition may further comprise at least one member of optically active compounds selected from four specified pyrimidine compounds.
Inventors
- 👤 Kanetsugu Terashima
- 👤 Mitsuyoshi Ichihashi
- 👤 Makoto Kikuchi
- 👤 Fusayuki Takeshita
- 👤 Kenji Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:09
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
A ferroelectric liquid crystal composition having a cholesteric comprising an achiral compound expressed by the formula ##STR60## wherein R 1 and R 2 each represent the same or different linear or branched chain alkyl group of 1 to 18 carbon atoms, in 20 to 70% by weight, and an optically active compound causing a cholestric phase to appear.
Claim 2
Dependent Claim
58 words
A ferroelectric liquid crystal composition having a cholesteric comprising an achiral compound expressed by the formula ##STR60## wherein R 1 and R 2 each represent the same or different linear or branched chain alkyl group of 1 to 18 carbon atoms, in 20 to 70% by weight, and an optically active compound causing a cholestric phase to appear.
Claim 3
Dependent Claim
151 words
A ferroelectric liquid crystal composition according to claim 1, comprising at least one member of optically active compounds selected from the group consisting of compounds expressed by the following formulas (II) to (V) in 10 to 50% by weight and having cholesteric phase: ##STR61## wherein R 3 , R 5 , R 7 and R 9 each represent a linear or branched alkyl group or alkoxy group each of 1 to 18 carbon atoms, R 4 , R 6 and R 10 each represent a linear or branched alkyl group or alkoxy group each of 2 to 18 carbon atoms or a linear or branched alkoxy group of 1 to 18 carbon atoms, R 8 represents a linear or branched chain alkyl group or alkoxy group each of 1 to 18 carbon atoms, l and m each represent an integer of 0 to 10 and * indicates an asymmetric carbon atom.
Claim 4
Dependent Claim
16 words
A light switching element containing the ferroelectric liquid crystal composition as set forth in claim 1.
Claim 5
Dependent Claim
16 words
A light switching element containing the ferroelectric liquid crystal composition as set forth in claim 2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |