US4621901A
Expired / Lapsed
US
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Novel liquid crystal mixtures
Assignee: F Hoffmann La Roche AG
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Filing: 1985-06-26
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Granted: 1986-11-11
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Expires: 2005-06-26
Abstract
Abstract Liquid crystalline mixtures containing compounds of the formula <IMAGE> I wherein n stands for the number 0 or 1; X1 and X2 denote single covalent bonds or one of the symbols X1 and X2 also denotes -COO-, -OOC- or -CH2CH2-; the rings A1, A2, and A3 represent 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also represents a 2,5-disubstituted pyrimidine ring or a trans-2,5-disubstituted m-dioxane ring; R1 signifies 4-alkenyl or on a cyclohexyl ring also 2Z-alkenyl; and R2 denotes alkyl, alkoxy, -CN or -NCS, as well as the manufacture of these compounds and the use for electro-optical purposes are described.
Inventors
- 👤 Martin Petrzilka
- 👤 Martin Schadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:57
CPC Classifications
C; C07; C07C; C07C255/00; C07C13/00; C07C13/28; C07C331/00; C07C331/16; C07C331/28; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/14; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/34; C09K19/3402; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3469; C09K19/42; C09K2019/3422
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A liquid crystalline mixture containing (a) a liquid crystalline carrier material; and (b) a compound of the formula: ##STR15## wherein n is the integer 0 or 1; X 1 and X 2 are single covalent bonds or one of X 1 and X 2 also is --COO--, --OOC-- or --CH 2 CH 2 --; the rings A 1 , A 2 and A 3 independently are 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is 2,5-disubstituted pyrimidine or trans-2,5-disubstituted m-dioxane; R 1 is 4-alkenyl or when positioned on a cyclohexyl ring R 1 also can be 2Z-alkenyl; and R 2 is alkyl, alkoxy, --CN or --NCS.
Claim 2
Dependent Claim
108 words
A liquid crystalline mixture containing (a) a liquid crystalline carrier material; and (b) a compound of the formula: ##STR15## wherein n is the integer 0 or 1; X 1 and X 2 are single covalent bonds or one of X 1 and X 2 also is --COO--, --OOC-- or --CH 2 CH 2 --; the rings A 1 , A 2 and A 3 independently are 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is 2,5-disubstituted pyrimidine or trans-2,5-disubstituted m-dioxane; R 1 is 4-alkenyl or when positioned on a cyclohexyl ring R 1 also can be 2Z-alkenyl; and R 2 is alkyl, alkoxy, --CN or --NCS.
Claim 3
Dependent Claim
35 words
The mixture of claim 1, wherein the rings A 1 , A 2 and A 3 independently are 1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also can be 2,5-disubstituted pyrimidine or trans-2,5-disubstituted m-dioxane ring.
Claim 4
Dependent Claim
29 words
The mixture of claim 2, wherein X 1 and X 2 are single covalent bonds or one of X 1 and X 2 also can be --COO-- or --OOC--.
Claim 5
Dependent Claim
38 words
The mixture of claim 2 wherein R 1 is a straight-chain 4-alkenyl of 5 to 12 carbon atoms or when positioned on a cyclohexyl ring R 1 also can be straight-chain 2Z-alkenyl of 3 to 12 carbon atoms.
Claim 6
Dependent Claim
17 words
The mixture of claim 4, wherein R 1 is straight-chain 4-alkenyl of 5 to 12 carbon atoms.
Claim 7
Dependent Claim
13 words
The mixture of claim 5, wherein R 1 is 4-pentenyl, 4Z-hexenyl or 4Z-heptenyl.
Claim 8
Dependent Claim
38 words
The mixture of claim 2, wherein R 2 is straight-chain C 1 -C 12 -alkyl or when positioned on a benzene or pyrimidine ring R 2 also can be --CN, --NCS or straight-chain C 1 -C 12 -alkoxy.
Claim 9
Dependent Claim
137 words
An electro-optical cell comprising: (a) two plate means; (b) a liquid crystal mixture disposed between the two plate means and including (i) a liquid crystalline carrier material; and (ii) a compound of the formula ##STR16## wherein n is the integer 0 or 1; X 1 and X 2 are single covalent bonds or one of X 1 and X 2 also is --COO--, --OOC-- or --CH 2 CH 2 --; the rings A 1 , A 2 and A 3 independently are 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is 2,5-disubstituted pyrimidine or trans-2,5-disubstituted m-dioxane; R 1 is 4-alkenyl or when positioned on a cyclohexyl ring R 1 also can be 2Z-alkenyl; and R 2 is alkyl, alkoxy, --CN or --NCS; and (c) means for applying an electric potential to the two plate means.
Claim 10
Dependent Claim
137 words
An electro-optical cell comprising: (a) two plate means; (b) a liquid crystal mixture disposed between the two plate means and including (i) a liquid crystalline carrier material; and (ii) a compound of the formula ##STR16## wherein n is the integer 0 or 1; X 1 and X 2 are single covalent bonds or one of X 1 and X 2 also is --COO--, --OOC-- or --CH 2 CH 2 --; the rings A 1 , A 2 and A 3 independently are 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is 2,5-disubstituted pyrimidine or trans-2,5-disubstituted m-dioxane; R 1 is 4-alkenyl or when positioned on a cyclohexyl ring R 1 also can be 2Z-alkenyl; and R 2 is alkyl, alkoxy, --CN or --NCS; and (c) means for applying an electric potential to the two plate means.
Claim 11
Dependent Claim
40 words
The mixture of claim 1, wherein n is the integer 0, X 1 is a single covalent bond, ring A 1 is trans-1,4-cyclohexylene, ring A 2 is 1,4-phenylene, R 1 is 4-pentenyl and R 2 is ethyl, --CN or --NCS.
Claim 12
Dependent Claim
46 words
The mixture of claim 1, wherein n is the integer 1, X 1 and X 2 are single covalent bonds, ring A 1 is trans-1,4-cyclohexylene, rings A 2 and A 3 are 1,4-phenylene, R 1 is 4-pentenyl and R 2 is ethyl, propyl, --CN or --NCS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |