Patent US4812259A successfully refreshed from Google Patents.
US4812259A
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Lactic acid derivative, liquid crystal composition containing same and liquid crystal device
Assignee: Canon Inc
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Filing: 1986-10-23
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Granted: 1989-03-14
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Expires: 2006-10-23
Abstract
Abstract An optically active lactic acid derivative represented by the following formula (Ia) or (Ib): ##STR1## wherein R is a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 1-16 carbon atoms, R 1 is an alkyl group having 4-16 carbon atoms, m and n are respectively 1 or 2, k is 0 or 1, and C* is an asymmetric carbon atom. A liquid crystal composition containing the lactic acid derivative and a liquid crystal device using the liquid crystal composition are also disclosed.
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Kazuharu Katagiri
- 👤 Kenji Shinjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:28
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/21; C07C65/24; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/062; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K2019/0425; C09K2019/0437; C09K2019/121; C09K2019/122
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
57 words
An optically active lactic acid derivative represented by the formula (Ib): ##STR15## wherein R 1 is an alkyl group having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1 or 2 such that m+n=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 2
Dependent Claim
57 words
An optically active lactic acid derivative represented by the formula (Ib): ##STR15## wherein R 1 is an alkyl group having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1 or 2 such that m+n=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 3
Dependent Claim
19 words
A lactic acid derivative according to claim 1, which has a temperature range where it assumes a smectic phase.
Claim 4
Dependent Claim
20 words
A lactic acid derivative according to claim 1, which has a temperature range where it assumes a chiral smectic phase.
Claim 5
Dependent Claim
20 words
A lactic acid derivative according to claim 1, which has a temperature range where it assumes chiral smectic C phase.
Claim 6
Dependent Claim
22 words
A lactic acid derivative according to claim 1, which has temperature ranges where it assumes cholesteric phase and a chiral smectic phase.
Claim 7
Dependent Claim
23 words
A lactic acid derivative according to claim 1, which has temperature ranges where it assumes smectic A phase and chiral smectic C phase.
Claim 8
Dependent Claim
25 words
A lactic acid derivative according to claim 1, which has temperature ranges where it assumes cholesteric phase, smectic A phase and chiral smectic C phase.
Claim 9
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR16##
Claim 10
Dependent Claim
15 words
A latic acid derivative according to claim 1, which is represented by the formula: ##STR17##
Claim 11
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR18##
Claim 12
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR19##
Claim 13
Dependent Claim
15 words
A lactic acid derivative according to claim 1, which is represented by the formula: ##STR20##
Claim 14
Dependent Claim
73 words
A liquid crystal composition comprising a mixture of a liquid crystal and at least one species of optically active lactic acid derivative represented by the formula (Ib): ##STR21## wherein R 1 is an alkyl group having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1 or 2 such that m+n=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 15
Dependent Claim
73 words
A liquid crystal composition comprising a mixture of a liquid crystal and at least one species of optically active lactic acid derivative represented by the formula (Ib): ##STR21## wherein R 1 is an alkyl group having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1 or 2 such that m+n=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 16
Dependent Claim
28 words
A liquid crystal composition according to claim 13, which comprises a mixture of the lactic acid derivative and a ferroelectric liquid crystal, and shows a chiral smectic phase.
Claim 17
Dependent Claim
21 words
A liquid crystal composition according to claim 14, which contains the lactic acid derivative in a proportion of 0.1-99 wt. %.
Claim 18
Dependent Claim
21 words
A liquid crystal composition according to claim 14, which contains the lactic acid derivative in a proportion of 1-90 wt. %.
Claim 19
Dependent Claim
21 words
A liquid crystal composition according to claim 14, wherein said ferroelectric liquid crystal is a compound having a phenyl benzoate unit.
Claim 20
Dependent Claim
20 words
A liquid crystal composition according to claim 14, wherein said ferroelectric liquid crystal is a compound having an azoxybenzene unit.
Claim 21
Dependent Claim
21 words
A liquid crystal composition according to claim 14, wherein said ferroelectric liquid crystal is a compound having a phenyl biphenylcarboxylate unit.
Claim 22
Dependent Claim
20 words
A liquid crystal composition according to claim 14, wherein said ferroelectric liquid crystal is a compound having an ester unit.
Claim 23
Dependent Claim
28 words
A liquid crystal composition according to claim 13, which comprises a mixture of the lactic acid derivative and a smectic liquid crystal, and shows a chiral smectic phase.
Claim 24
Dependent Claim
21 words
A liquid crystal composition according to claim 13, which contains the lactic acid derivative in a proportion of 1-90 wt. %.
Claim 25
Dependent Claim
20 words
A liquid crystal composition according to claim 21, wherein said smectic liquid crystal is a compound having an ester unit.
Claim 26
Dependent Claim
21 words
A liquid crystal composition according to claim 21, wherein said smectic liquid crystal is a compound having a phenyl biphenylcarboxylate unit.
Claim 27
Dependent Claim
20 words
A liquid crystal composition according to claim 21, wherein said smectic liquid crystal is a compound having an azoxybenzene unit.
Claim 28
Dependent Claim
20 words
A liquid crystal composition according to claim 21, wherein said smectic liquid crystal is a compound having a pyrimidine ring.
Claim 29
Dependent Claim
21 words
A liquid crystal composition according to claim 21, wherein said smectic liquid crystal is a compound having a phenyl benzoate unit.
Claim 30
Dependent Claim
27 words
A liquid crystal composition according to claim 13, which comprises a mixture of the lactic acid derivative and a nematic liquid crystal, and shows a nematic phase.
Claim 31
Dependent Claim
89 words
A liquid crystal device comprising a pair of base plates an a liquid crystal composition disposed between the base plates; said liquid crystal composition comprising a mixture of a liquid crystal and at least one species of lactic acid derivative represented by the formula (Ib): ##STR22## wherein R 1 is an alkyl having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1or 2 such that m+m=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 32
Dependent Claim
89 words
A liquid crystal device comprising a pair of base plates an a liquid crystal composition disposed between the base plates; said liquid crystal composition comprising a mixture of a liquid crystal and at least one species of lactic acid derivative represented by the formula (Ib): ##STR22## wherein R 1 is an alkyl having 4-16 carbon atoms, R is a linear alkyl group having 1-16 carbon atoms, m and n are 1or 2 such that m+m=2 or 3, k is 0 or 1, and C* is an asymmetric carbon atom.
Claim 33
Dependent Claim
18 words
A liquid crystal device according to claim 29, wherein said liquid crystal composition shows a chiral smectic phase.
Claim 34
Dependent Claim
31 words
A liquid crystal device according to claim 30, wherein said liquid crystal composition is disposed in such a thickness as to release the spiral structure of the chiral smectic C phase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
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