US4830470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystalline esters
Assignee: F Hoffmann La Roche AG
•
Filing: 1987-05-20
•
Granted: 1989-05-16
•
Expires: 2007-05-20
Abstract
Abstract Compounds of the formula ##STR1## wherein m represents is the number 0 or 1; A is a single covalent bond, --CH 2 --CH 2 --, --OCH 2 --, --COO-- or --OOC--; rings B, C and D are 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl; Y 1 and Y 2 are hydrogen or one of them also is cyano; and R 1 and R 2 each represents C 1 -C 18 -alkyl or C 2 -C 18 alkenyl, either of which is optionally halogen-substituted, in which one CH 2 group or two non-adjacent CH 2 groups is/are optionally replaced by oxygen; with the provisos that at least one of R 1 and R 2 has a chiral carbon atom or a C--C double bond or both when A is --COO-- and at least one of R 1 and R 2 has a C--C double bond when A is a single covalent bond, their preparation, liquid crystalline mixtures containing these compounds and their use for electro-optical purposes are described.
Inventors
- 👤 Richard Buchecker
- 👤 Hans-Jurgen Fromm
- 👤 Stephen Kelly
- 👤 Martin Schadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:02
CPC Classifications
C; C07; C07C; C07C69/00; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
A compound of the formula ##STR11## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral.
Claim 2
Dependent Claim
62 words
A compound of the formula ##STR11## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral.
Claim 3
Dependent Claim
50 words
An optically active compound according to claim 1 wherein R 1 is of the formula ##STR12## wherein n is 1; p is a whole number from 0 to 6; R 3 is alkyl and R 4 is alkyl different from R 3 ; and C* is the chiral carbon atom.
Claim 4
Dependent Claim
29 words
An optically active compound according to claim 2, wherein R 1 is of formula II in which R 3 is methyl and R 4 is alkyl different from methyl.
Claim 5
Dependent Claim
19 words
A compound according to claim 1, wherein R 1 and R 2 together have at least 7 carbon atoms.
Claim 6
Dependent Claim
79 words
A liquid crystalline mixture with at least two components, wherein at least one of these components is a compound of the formula ##STR13## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral.
Claim 7
Dependent Claim
79 words
A liquid crystalline mixture with at least two components, wherein at least one of these components is a compound of the formula ##STR13## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral.
Claim 8
Dependent Claim
50 words
A liquid crystalline mixture according to claim 5 wherein R 1 is of the formula ##STR14## wherein n is 1; p is a whole number from 0 to 6; R 3 is alkyl and R 4 is alkyl different from R 3 ; and C* is the chiral carbon atom.
Claim 9
Dependent Claim
29 words
A liquid crystalline mixture according to claim 6, wherein R 1 is of formula II in which R 3 is methyl and R 4 is alkyl different from methyl.
Claim 10
Dependent Claim
21 words
A liquid crystalline mixture according to claim 5, wherein R 1 and R 2 together have at least 7 carbon atoms.
Claim 11
Dependent Claim
94 words
An electro-optical cell comprising: (a) two-plate means; (b) a liquid crystal disposed between the plate means and which includes a dielectric of the formula ##STR15## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral; and (c) a means for applying an electrical potential to said plate means.
Claim 12
Dependent Claim
94 words
An electro-optical cell comprising: (a) two-plate means; (b) a liquid crystal disposed between the plate means and which includes a dielectric of the formula ##STR15## wherein m is zero; A is --CH 2 --CH 2 --; rings B and C are 1,4-phenylene, unsubstituted; Y 1 and Y 2 are hydrogen; R 1 is C 4 -C 18 -alkoxy and R 2 is C 1 -C 18 -alkyl; in which R 1 has a chiral carbon atom and R 2 is achiral; and (c) a means for applying an electrical potential to said plate means.
Claim 13
Dependent Claim
53 words
An electro-optical cell according to claim 9 wherein the group with a chiral carbon atom is of the formula ##STR16## wherein n is 1; p is a whole number from 0 to 6; R 3 is alkyl and R 4 is different from R 3 ; and C* is the chiral carbon atom.
Claim 14
Dependent Claim
28 words
An electro-optical cell according to claim 10, wherein R 1 is of formula II in which R 3 is methyl and R 4 is alkyl different from methyl.
Claim 15
Dependent Claim
20 words
An electro-optical cell according to claim 9, wherein R 1 and R 2 together have at least 7 carbon atoms.
References Cited (Backward Citations)
US4173545A
Cited
DE2736424A1
Cited
DE2736772A1
Cited
DE2752975A1
Cited
GB2010272A
Cited
US4212762A
Cited
US4229315A
Cited
US4279770A
Cited
US4239434A
Cited
US4368135A
Cited
US4564694A
Cited
JPS57149250A
Cited
JPS5813546A
Cited
JPS5813545A
Cited
EP0087102A1
Cited
US4584120A
Cited
US4551264A
Cited
JPS58203943A
Cited
US4480117A
Cited
US4519936A
Cited
US4526704A
Cited
US4510069A
Cited
JPS59167542A
Cited
US4676604A
Cited
JPS59170030A
Cited
US4565425A
Cited
US4602851A
Cited
US4610805A
Cited
EP0164814A2
Cited
US4642199A
Cited
US4629581A
Cited
US4621901A
Cited
US4709030A
Cited
WO1986004327A1
Cited
JPS61229842A
Cited
JPS61243037A
Cited
US4729847A
Cited
JPH06110544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |