US4979805A
Expired / Lapsed
US
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Ferroelectric liquid crystal device containing optically active azo or azoxy benzene type mesomorphic compound with extended life
Assignee: Canon Inc
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Filing: 1989-12-01
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Granted: 1990-12-25
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Expires: 2009-12-01
Abstract
Abstract A ferroelectric liquid crystal composition containing an optically active mesomorphic compound represented by the following formula (I) or (II): ##STR1## wherein R 1 and R 2 are respectively an alkyl, and C with * represents an asymmetric carbon atom. The mesomorphic compound provides the ferroelectric liquid crystal composition with an extended operational life in a liquid crystal device.
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Kazuharu Katagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:32
CPC Classifications
C; C07; C07C; C07C291/00; C07C291/02; C07C291/08; C07C245/00; C07C245/02; C07C245/06; C07C245/08; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/24; C09K19/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A ferroelectric chiral smectic liquid crystal device comprising: a cell, and a ferroelectric chiral smectic liquid crystal composition comprising a ferroelectric smectic liquid crystal compound and a compound of formula (I) ##STR29## or formula (II) ##STR30## wherein R 1 and R 2 are independently linear alkyl groups containing 6 to 16 carbon atoms, and C with * is an asymmetric carbon atom, said compound of formula (I) or (II) being present in an amount of 0.01 to 100 parts by weight with respect to 100 parts by weight of said ferroelectric chiral smectic liquid crystal compound.
Claim 2
Dependent Claim
96 words
A ferroelectric chiral smectic liquid crystal device comprising: a cell, and a ferroelectric chiral smectic liquid crystal composition comprising a ferroelectric smectic liquid crystal compound and a compound of formula (I) ##STR29## or formula (II) ##STR30## wherein R 1 and R 2 are independently linear alkyl groups containing 6 to 16 carbon atoms, and C with * is an asymmetric carbon atom, said compound of formula (I) or (II) being present in an amount of 0.01 to 100 parts by weight with respect to 100 parts by weight of said ferroelectric chiral smectic liquid crystal compound.
Claim 3
Dependent Claim
85 words
A ferroelectric chiral smectic liquid crystal composition comprising a ferroelectric chiral smectic liquid crystal compound and a compound of formula (I) ##STR31## or formula (II) ##STR32## wherein R 1 and R 2 are independently linear groups containing 6 to 16 carbon atoms, and C with * is an asymmetric carbon atom, said compound of formula (I) or (II) being present in an amount of 0.01 to 100 parts by weight with respect to 100 parts by weight of said ferroelectric chiral smectic liquid crystal compound.
Claim 4
Dependent Claim
85 words
A ferroelectric chiral smectic liquid crystal composition comprising a ferroelectric chiral smectic liquid crystal compound and a compound of formula (I) ##STR31## or formula (II) ##STR32## wherein R 1 and R 2 are independently linear groups containing 6 to 16 carbon atoms, and C with * is an asymmetric carbon atom, said compound of formula (I) or (II) being present in an amount of 0.01 to 100 parts by weight with respect to 100 parts by weight of said ferroelectric chiral smectic liquid crystal compound.
Claim 5
Dependent Claim
21 words
A ferroelectric liquid crystal composition according to claim 2, wherein the ferroelectric liquid crystal is a chiral smetic liquid crystal compound.
Claim 6
Dependent Claim
39 words
A ferroelectric liquid crystal composition according to claim 2, wherein the compound of formula (I) or formula (II) is present in the amount of 0.1 to 100 parts per 100 parts by weight of the ferroelectric liquid crystal compound.
Claim 7
Dependent Claim
21 words
The liquid crystal composition according to claim 2, wherein the ferroelectric liquid crystal compound is a Schiff base-type liquid crystal compound.
Claim 8
Dependent Claim
20 words
The liquid crystal composition according to claim 2, wherein the ferroelectric liquid crystal compound is an ester-type liquid crystal compound.
Claim 9
Dependent Claim
20 words
The liquid crystal composition according to claim 2, wherein the ferroelectric liquid crystal compound is an azoxy-type liquid crystal compound.
Claim 10
Dependent Claim
24 words
The liquid crystal composition according to claim 2, wherein the R 1 in the formula (I) is alkyl having 6 to 12 carbon atoms.
Claim 11
Dependent Claim
24 words
The liquid crystal composition according to claim 2, wherein the R 2 in the formula (II) is alkyl having 6 to 12 carbon atoms.
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