US4228029A
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Liquid crystalline compositions
Assignee: E MERCK PATENT GmbH
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Filing: 1979-01-24
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Granted: 1980-10-14
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Expires: 1999-01-24
Abstract
Abstract Liquid crystalline compositions, especially for displays with a twisted nematic phase, comprising at least one compound of the formula ##STR1## wherein X=H, --CHO or --CH 3 , R 1 =C 1 --C 10 alkyl, R 2 is a monovalent organic group, for example, --CN; and Y is a single bond or one of the groups --COO-- or ##STR2## The compositions show a high positive dielectric anisotropy (Δε), a high Δn, and a low viscosity, and the mixture system may comprise relatively few components.
Inventors
- 👤 Maged A. Osman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
A liquid crystalline composition, especially for liquid crystal displays with a twisted nematic phase, comprising one liquid crystalline or potentially liquid crystalline compound and at least one compound of the formula (1) ##STR16## wherein X is a hydrogen atom, a formyl group or a methyl group; R 1 is a C 1 -C 10 alkyl group, R 2 is selected from the group consisting of C 1 -C 10 alkyl radicals, C 1 -C 10 alkoxy radicals, C 2 -C 10 acyloxy radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl; and Y is a single bond between the cyclohexyl and aryl radicals or Y is a carbonyloxy group or a p-phenylene residue.
Claim 2
Dependent Claim
110 words
A liquid crystalline composition, especially for liquid crystal displays with a twisted nematic phase, comprising one liquid crystalline or potentially liquid crystalline compound and at least one compound of the formula (1) ##STR16## wherein X is a hydrogen atom, a formyl group or a methyl group; R 1 is a C 1 -C 10 alkyl group, R 2 is selected from the group consisting of C 1 -C 10 alkyl radicals, C 1 -C 10 alkoxy radicals, C 2 -C 10 acyloxy radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl; and Y is a single bond between the cyclohexyl and aryl radicals or Y is a carbonyloxy group or a p-phenylene residue.
Claim 3
Dependent Claim
25 words
Liquid crystalline composition according to claim 1, wherein said compound (1) is represented by the formula (1a) ##STR17## wherein R 2 is a nitrile group.
Claim 4
Dependent Claim
25 words
Liquid crystalline composition according to claim 1, wherein said compound (1) is represented by the formula (1b) ##STR18## wherein R 2 is a nitrile group.
Claim 5
Dependent Claim
36 words
Liquid crystalline composition according to claim 3, wherein Y is a single bond or a p-phenylene-residue and wherein said compound (1a) is present in an amount of 5 to 95 mole% of said liquid crystalline composition.
Claim 6
Dependent Claim
17 words
Liquid crystalline composition according to claim 1, which contains at least two different compounds of formula (1).
Claim 7
Dependent Claim
14 words
Liquid crystalline composition according to claim 1, which is a tertiary or quaternary mixture.
Claim 8
Dependent Claim
18 words
Liquid crystalline composition according to claim 1, which is a mixture consisting exclusively of compounds of formula (1).
Claim 9
Dependent Claim
40 words
Liquid crystalline composition according to claim 2, which contain at least one compound of the formula (1a), in which Y is a single bond, and at least one compound of the formula (1a), in which Y is a p-phenylene residue.
Claim 10
Dependent Claim
78 words
A compound of the formula (1) ##STR19## wherein X is a hydrogen atom, a formyl group or a methyl group; R 1 is a C 1 -C 10 alkyl group, R 2 is selected from the group consisting of C 1 -C 10 alkyl radicals, C 1 -C 10 alkoxy radicals, C 2 -C 10 acyloxyl radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl; and Y is a single bond or Y is a carbonyloxy group or a p-phenylene residue.
Claim 11
Dependent Claim
78 words
A compound of the formula (1) ##STR19## wherein X is a hydrogen atom, a formyl group or a methyl group; R 1 is a C 1 -C 10 alkyl group, R 2 is selected from the group consisting of C 1 -C 10 alkyl radicals, C 1 -C 10 alkoxy radicals, C 2 -C 10 acyloxyl radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl; and Y is a single bond or Y is a carbonyloxy group or a p-phenylene residue.
Claim 12
Dependent Claim
10 words
A compound according to claim 9 of formula (1a) ##STR20##
Claim 13
Dependent Claim
10 words
A compound of claim 9 of the formula (1d) ##STR21##
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |