US4818428A
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Liquid crystal phase
Assignee: Merck Patent GmbH
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Filing: 1985-12-20
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Granted: 1989-04-04
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Expires: 2005-12-20
Abstract
Abstract The invention relates to liquid crystal phases (LC phases) having a particularly low threshold voltage, a particularly low ratio K 3 /K 1 of the elastic constants for bending (K 3 ) and spreading (K 1 ) and broad nematic phase ranges, these phases containing at the same time at least one highly polar component of reduced degree of association and, to reduce the quotient K 3 /K 1 of the elastic constants for bending (K 3 ) and spreading (K 1 ) of the phases to a value≦1.1, at least one apolar liquid crystal component.
Inventors
- 👤 Bernhard Scheuble
- 👤 Georg Weber
- 👤 Joachim Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:23
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/08; C09K19/10; C09K19/12; C09K19/20; C09K19/2007; C09K19/22; C09K19/24; C09K19/26; C09K19/30; C09K19/3001; C09K19/3402; C09K19/3441; C09K19/345; C09K19/42; C09K19/46; C09K2019/3422
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
231 words
A liquid crystal phase having at least five liquid crystal components and a threshold voltage <1.6 volt, and containing at least 18% of a highly polar component of reduced degree of association and, effective to reduce the phase's quotient of K 3 /K 1 of the elastic constant for bending (K 3 ) and spreading (K 1 ) to a value ≦1.1, at least 27% of an apolar liquid crystal component having a dielectric anisotropy in the range from -2 to +2, wherein the highly polar component of reduced degree of association is at least one of the compounds: ##STR8## in which R is a straight-chain alkyl group of 1 to 7 C atoms and in which a CH 2 group can be replaced by --O-- or --CH═CH--, the apolar liquid crystal component is at least one of the compounds: ##STR9## in which alkyl and alkoxy are each a straight-chain alkyl or alkoxy group of 1 to 7 C atoms, R° is a straight-chain alkyl or alkoxy group or an oxaalkyl or alkenyl group of 1 to 7 C atoms, R is a straight-chain alkyl group of 2 to 10 C atoms, in which a CH 2 group can be replaced by --O-- or --CH═CH--, and R 2 is butyryloxy, and the pyrimidine compounds of formulae Io to Ir and/or IIa are present in a total amount of 27 to 61%.
Claim 2
Dependent Claim
231 words
A liquid crystal phase having at least five liquid crystal components and a threshold voltage <1.6 volt, and containing at least 18% of a highly polar component of reduced degree of association and, effective to reduce the phase's quotient of K 3 /K 1 of the elastic constant for bending (K 3 ) and spreading (K 1 ) to a value ≦1.1, at least 27% of an apolar liquid crystal component having a dielectric anisotropy in the range from -2 to +2, wherein the highly polar component of reduced degree of association is at least one of the compounds: ##STR8## in which R is a straight-chain alkyl group of 1 to 7 C atoms and in which a CH 2 group can be replaced by --O-- or --CH═CH--, the apolar liquid crystal component is at least one of the compounds: ##STR9## in which alkyl and alkoxy are each a straight-chain alkyl or alkoxy group of 1 to 7 C atoms, R° is a straight-chain alkyl or alkoxy group or an oxaalkyl or alkenyl group of 1 to 7 C atoms, R is a straight-chain alkyl group of 2 to 10 C atoms, in which a CH 2 group can be replaced by --O-- or --CH═CH--, and R 2 is butyryloxy, and the pyrimidine compounds of formulae Io to Ir and/or IIa are present in a total amount of 27 to 61%.
Claim 3
Dependent Claim
21 words
A phase according to claim 1, which contains at least three compounds of formula Id, Ie, Ii or Il or Ir.
Claim 4
Dependent Claim
15 words
A phase according to claim 2, which contains at least four of said apolar components.
Claim 5
Dependent Claim
17 words
A phase according to claim 3, which contains at least 32% of an apolar liquid crystal component.
Claim 6
Dependent Claim
15 words
A phase according to claim 1, which contains at least one compound of formula IIa.
Claim 7
Dependent Claim
15 words
A phase according to claim 1, which contains at least one compound of formula Io.
Claim 8
Dependent Claim
55 words
A phase according to claim 1, which contains at least one compound of the following formulas: ##STR10## in which R is a straight-chain alkyl group of 1 to 7 C atoms, in which in addition a CH 2 group can also be replaced by --O-- or --CH═CH--, ##STR11## Cy is trans-1,4-cyclohexylene and Ph is 1,4-phenylene.
Claim 9
Dependent Claim
12 words
A phase according to claim 1, which contains at least one 2-p-cyanophenyl-5-n-alkyl-1,3-dioxane.
Claim 10
Dependent Claim
15 words
A phase according to claim 1, which has no smectic phase ranges to -20° C.
Claim 11
Dependent Claim
15 words
A phase according to claim 9, which has no smectic phase ranges to -30° C.
Claim 12
Dependent Claim
13 words
A phase according to claim 1, which has a threshold voltage ≦1.5 volt.
Claim 13
Dependent Claim
15 words
A phase according to claim 1, which has a quotient K 3 /K 1 ≦1.0.
Claim 14
Dependent Claim
21 words
A phase according to claim 1, which has a quotient K 3 /K 1 ≦0.9 and a threshold voltage ≦1.4 volt.
Claim 15
Dependent Claim
13 words
A phase according to claim 13, which has a threshold voltage ≦1/2 volt.
Claim 16
Dependent Claim
13 words
A phase according to claim 1, which contains one or more pleochroic dyes.
Claim 17
Dependent Claim
19 words
A phase according to claim 15, which contains 1 to 7% by weight of one or more pleochroic dyes.
Claim 18
Dependent Claim
36 words
A phase according to claim 1, wherein the total proportion of the higly polar component of reduced degree of association and of the apolar liquid crystal component as specified in claim 1 is at least 50%.
Claim 19
Dependent Claim
21 words
In an electro-optical display element comprising a liquid crystal phase, the improvement wherein the phase is one according to claim 1.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |