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US4122026A
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Liquid crystal mixtures
Assignee: E MERCK PATENT GmbH
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Filing: 1977-05-04
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Granted: 1978-10-24
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Expires: 1997-05-04
Abstract
Abstract A nematic liquid crystal mixture comprises at least one nematic liquid crystal compound and an amount, sufficient to impart a positive DC anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound having a positive DC anisotropy of above about 25, of the formula (1) ##STR1## wherein X is a monovalent radical of the formula --NR 3 R 4 or --N(R 5 )(CHO); Y is a bivalent radical of the formula --CH═N--, --N═CH--, --N═N--, --CH═CH--, --C(O)O--, --O(O)C--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR2## Z is a monovalent radical of the formula --CN, --NO 2 , --SO 2 CH 3 , --SO 2 CF 3 or --NHCOR 5 ; R 1 and R 2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxy; R 3 and R 4 are the same or different and each is hydrogen or an alkyl group containing from 1 to 8 carbon atoms; R 5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.
Inventors
- 👤 Maged A. Osman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:57
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/14; C09K19/16; C09K19/20; C09K19/2007; C09K19/22; C09K19/24; C09K19/28
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
172 words
A nematic liquid crystal mixture comprising at least one nematic liquid crystal compound and an amount, sufficient to impart a positive Dielectric Constant anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound of the formula (1) ##STR20## wherein X is a monovalent radical of the formula --NHR 4 or --N(R 5 ) (CHO); Y is a bivalent radical of the formula --CH═N--, --N═CH--, --N═N--, --CH═CH--, --C(O)O--, --O(O)C--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR21## Z is a monovalent radical of the formula --CN, --NO 2 , --SO 2 CH 3 , --SO 2 CF 3 or --NHCOR 5 ; R 1 and R 2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxyl; R 4 is an alkyl group containing from 1 to 8 carbon atoms; R 5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.
Claim 2
Dependent Claim
172 words
A nematic liquid crystal mixture comprising at least one nematic liquid crystal compound and an amount, sufficient to impart a positive Dielectric Constant anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound of the formula (1) ##STR20## wherein X is a monovalent radical of the formula --NHR 4 or --N(R 5 ) (CHO); Y is a bivalent radical of the formula --CH═N--, --N═CH--, --N═N--, --CH═CH--, --C(O)O--, --O(O)C--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR21## Z is a monovalent radical of the formula --CN, --NO 2 , --SO 2 CH 3 , --SO 2 CF 3 or --NHCOR 5 ; R 1 and R 2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxyl; R 4 is an alkyl group containing from 1 to 8 carbon atoms; R 5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.
Claim 3
Dependent Claim
22 words
The mixture of claim 1, wherein Y is a bivalent group of the formula --C(O)O--, --O(O)C--, --C(O)S--, --S(O)C--, --CH═N--, --N═CH-- or ##STR22##
Claim 4
Dependent Claim
14 words
The mixture of claim 1, wherein Y is --CH═N--, --C(O)O-- or a single bond.
Claim 5
Dependent Claim
22 words
The mixture of claim 1, wherein Z is --CN, --SO 2 CH 3 , --SO 2 CF 3 or --NO 2 .
Claim 6
Dependent Claim
11 words
The mixture of claim 1, wherein Z is the nitrile group.
Claim 7
Dependent Claim
11 words
The mixture of claim 1, wherein m and n are zero.
Claim 8
Dependent Claim
19 words
The mixture of claim 1, wherein said nematic liquid crystal mixture contains at least two compounds of formula (1).
Claim 9
Dependent Claim
9 words
The mixture of claim 1, wherein p is 0.
Claim 10
Dependent Claim
154 words
A nematic liquid crystal mixture comprising at least one nematic liquid crystal compound and an amount, sufficient to impart a positive Dielectric Constant anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound of the formula (1) ##STR23## wherein X is the monovalent radical of the formula --N(R 5 )(CHO); Y is a bivalent radical of the formula --CH═N--, --N═CH--, --N═N, --CH═CH--, --C(O)O--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR24## Z is a monovalent radical of the formula --CN, --NO 2 , --SO 2 CH 3 , --SO 2 CF 3 or --NHCOR 5 ; R 1 and R 2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxyl; R 5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.
Claim 11
Dependent Claim
154 words
A nematic liquid crystal mixture comprising at least one nematic liquid crystal compound and an amount, sufficient to impart a positive Dielectric Constant anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound of the formula (1) ##STR23## wherein X is the monovalent radical of the formula --N(R 5 )(CHO); Y is a bivalent radical of the formula --CH═N--, --N═CH--, --N═N, --CH═CH--, --C(O)O--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR24## Z is a monovalent radical of the formula --CN, --NO 2 , --SO 2 CH 3 , --SO 2 CF 3 or --NHCOR 5 ; R 1 and R 2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxyl; R 5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.
Claim 12
Dependent Claim
22 words
The mixture of claim 9, wherein Y is a bivalent group of the formula --C(O)O--, --O(O)C--, --C(0)S--, --S(O)C--, --CH═N--, --N═CH-- or ##STR25##
Claim 13
Dependent Claim
14 words
The mixture of claim 9, wherein Y is --CH═N--, --C(O)O-- or a single bond.
Claim 14
Dependent Claim
22 words
The mixture of claim 9, wherein Z is --CN, --SO 2 CH 3 , --SO 2 CF 3 or --NO 2 .
Claim 15
Dependent Claim
11 words
The mixture of claim 9, wherein Z is the nitrile group.
Claim 16
Dependent Claim
11 words
The mixture of claim 9, wherein m and n are zero.
Claim 17
Dependent Claim
19 words
The mixture of claim 9, wherein said nematic liquid crystal mixture contains at least two compounds of formula (1).
Claim 18
Dependent Claim
9 words
The mixture of claim 9, wherein p is zero.
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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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |