US4402855A
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Type A smectic liquid crystal having a positive dielectric anisotropy
Assignee: Thales SA
•
Filing: 1981-07-15
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Granted: 1983-09-06
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Expires: 2001-07-15
Abstract
Abstract A family of liquid crystals having a type A smectic mesophase with a positive dielectric anisotropy, which are particularly useful in the case of the thermo-optical effect. The substances of the family are in accordance with the general formula: ##STR1## in which R represents an organic group of the alkyl or alkoxy type containing 1 to 15 carbon atoms and in which X and Y designate either the bromine or the nitrile radical.
Inventors
- 👤 Annie Zann
- 👤 Jean-Claude Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:05
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A liquid crystal, having type A smectic phase, of the formula ##STR31## wherein R represents C n H 2n+1 or C n H 2n+1 O with 1≦n≦15; and X represents Br or CN.
Claim 2
Dependent Claim
33 words
A liquid crystal, having type A smectic phase, of the formula ##STR31## wherein R represents C n H 2n+1 or C n H 2n+1 O with 1≦n≦15; and X represents Br or CN.
Claim 3
Dependent Claim
18 words
The liquid crystal according to claim 1, wherein: R is C 7 H 15 and X is Br.
Claim 4
Dependent Claim
19 words
The liquid crystal according to claim 1, wherein: R is C 8 H 17 O and X is Br.
Claim 5
Dependent Claim
18 words
The liquid crystal according to claim 1, wherein: R is C 7 H 15 and X is CN.
Claim 6
Dependent Claim
19 words
The liquid crystal according to claim 1, wherein: R is C 8 H 17 O and X is CN.
Claim 7
Dependent Claim
28 words
A liquid crystal composition, having type A smectic phase, comprising a first liquid crystal according to claim 1 and at least one additional type A smectic liquid crystal.
Claim 8
Dependent Claim
42 words
The liquid crystal composition according to claim 6, wherein said first liquid crystal is ##STR32## and said additional liquid crystal is ##STR33## and wherein the molar proportions of said first liquid crystal and said additional liquid crystal are 0.18 and 0.82, respectively.
Claim 9
Dependent Claim
57 words
The liquid crystal composition according to claim 6, wherein said first liquid crystal is ##STR34## and said additional liquid crystal is a second liquid crystal of the formula ##STR35## and a third liquid crystal of the formula ##STR36## and wherein the molar proportions of said first, second and third liquid crystals are 0.15, 0.22 and 0.64, respectively.
Claim 10
Dependent Claim
67 words
The liquid crystal composition according to claim 6, wherein said first liquid crystal is ##STR37## and said additional liquid crystal is a second liquid crystal of the formula ##STR38## a third liquid crystal of the formula ##STR39## and a fourth liquid crystal of the formula ##STR40## and wherein the molar proportions of said first, second, third and fourth liquid crystals are 0.13, 0.54, 0.18 and 0.15, respectively.
Claim 11
Dependent Claim
67 words
The liquid crystal composition according to claim 6, wherein said first liquid crystal is ##STR41## and said additional liquid crystal is a second liquid crystal of the formula ##STR42## a third liquid crystal of the formula ##STR43## and a fourth liquid crystal of the formula ##STR44## and wherein the molar proportions of said first, second, third and fourth liquid crystals are 0.14, 0.58, 0.19 and 0.09, respectively.
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