US4173544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel alkylsubstituted N-benzylideneanilines and liquid crystal compositions containing same
Assignee: E MERCK PATENT GmbH
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Filing: 1976-12-15
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Granted: 1979-11-06
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Expires: 1996-12-15
Abstract
Abstract Novel alkylsubstituted N-benzylideneanilines of formula ##STR1## in which n and m each represent zero or integers of from 1 to 8 and wherein the sum of n plus m is at least 6; the novel formula (I) compounds are suitable for use as dielectric component of electro-optic LC-display devices. Liquid crystal compositions containing the novel compounds for use as dielectric phase in nematic or smectic electro-optic LC-display devices and an improved method for producing 4-alkylsubstituted and 4,4'-dialkylsubstituted N-benzylideneanilines including the novel formula (I) compounds by condensation of the corresponding aldehydes and anilines in bulk.
Inventors
- 👤 Maged A. Osman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
In a process for producing compounds of formula ##STR10## in which R 1 and R 2 are selected each from the group consisting of hydrogen and alkyl radicals including from 1 to about 10 C-atoms, at least one of said groups R 1 and R 2 being an alkyl group, by condensation of a benzaldehyde compound of formula ##STR11## in which R 1 is as defined above, with an aniline compound of formula ##STR12## in which R 2 is as defined above; the improvement consisting of effecting said condensation of said benzaldehyde compound and said aniline compound in substantial absence of a solvent, at temperatures below 100° C. and in the substantial absence of oxygen.
Claim 2
Dependent Claim
115 words
In a process for producing compounds of formula ##STR10## in which R 1 and R 2 are selected each from the group consisting of hydrogen and alkyl radicals including from 1 to about 10 C-atoms, at least one of said groups R 1 and R 2 being an alkyl group, by condensation of a benzaldehyde compound of formula ##STR11## in which R 1 is as defined above, with an aniline compound of formula ##STR12## in which R 2 is as defined above; the improvement consisting of effecting said condensation of said benzaldehyde compound and said aniline compound in substantial absence of a solvent, at temperatures below 100° C. and in the substantial absence of oxygen.
Claim 3
Dependent Claim
28 words
A liquid crystal composition comprising 80-90% by weight of a compound of the formula (I) ##STR13## and 10-20% by weight of a compound of the formula (II) ##STR14##
Claim 4
Dependent Claim
28 words
A liquid crystal composition comprising 80-90% by weight of a compound of the formula (I) ##STR13## and 10-20% by weight of a compound of the formula (II) ##STR14##
Claim 5
Dependent Claim
22 words
The composition of claim 2 which comprises 90% of said compound of formula (I) and 10% of said compound of formula (II).
Claim 6
Dependent Claim
22 words
The composition of claim 2 which comprises 80% of said compound of formula (I) and 20% of said compound of formula (II).
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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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |