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US4722804A
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Liquid crystal composition
Assignee: Merck Patent GmbH
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Filing: 1986-02-28
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Granted: 1988-02-02
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Expires: 2006-02-28
Abstract
Abstract A liquid crystal composition having a positive dielectric anisotropy in the nematic phase, comprising of each 3 wt % or more of 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound and of a cyanobiphenyl compound.
Inventors
- 👤 Yutaka Ishii
- 👤 Fumiaki Funada
- 👤 Masataka Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:36
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A liquid crystal composition having a positive dielectric anisotropy in the nematic phase, comprising at least 3 wt% of a 2-(4-alkoxy phenyl)-5-alkylpyrimidine compound, at least 3 wt% of a para cyanobiphenyl compound, and each of the following compounds: ##STR24##
Claim 2
Dependent Claim
39 words
A liquid crystal composition having a positive dielectric anisotropy in the nematic phase, comprising at least 3 wt% of a 2-(4-alkoxy phenyl)-5-alkylpyrimidine compound, at least 3 wt% of a para cyanobiphenyl compound, and each of the following compounds: ##STR24##
Claim 3
Dependent Claim
32 words
A liquid crystal composition according to claim 1, wherein said 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound is represented by ##STR25## wherein R 1 =C n H 2n+1 (n=1˜12) and R 2 =C n H 2n+1 (n=1˜12).
Claim 4
Dependent Claim
67 words
A liquid crystal composition according to claim 1, wherein said para cyanobiphenyl compound is a member selected from the group consisting of: a 4-alkyl-4'-cyanobiphenyl, ##STR26## wherein R 3 =C n H 2n+1 (n=1˜9), a 4-alkoxy-4'-cyanobiphenyl, ##STR27## wherein R 4 =C m H 2m+1 (m=1˜7), a 4-alkoxy-ethyleneoxy-4'-cyanobiphenyl, ##STR28## wherein R 5 =C n H 2n+1 (n=1˜5), and a 4-cyano-4'(4-alkyl)-cyclohexylbiphenyl, ##STR29## wherein R 6 =C n H 2n+1 (n=1˜7).
Claim 5
Dependent Claim
74 words
A liquid crystal composition according to claim 1, wherein said 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound is present in amount of 10 wt.%, said para cyanobiphenyl is present in an amount of 20.7 wt.%, each of said compound (a), compound (b), compound (c), and compound (e) is present in an amount of 13.5 wt.%, said compound (d) is present in an amount of 9.0 wt.%, and said compound (f) is present in an amount of 6.3 wt. %.
Claim 6
Dependent Claim
20 words
A liquid crystal composition according to claim 4, which includes each of the following para cyanobiphenyl and 2-(4-alkoxyphenyl)-5-alkylpyrimidine compounds: ##STR30##
Claim 7
Dependent Claim
37 words
A liquid crystal composition according to claim 5, which includes each of the following para cyanobiphenyl and 2-(4-alkoxyphenyl)-5-alkylpyrimidine compounds present in the corresponding wt.%: ______________________________________
wt. %
______________________________________
##STR31## 11.7
##STR32## 9.0
##STR33## 5.0
##STR34## 5.0
______________________________________
References Cited (Backward Citations)
DE2257588A1
Cited
US3947375A
Cited
US4137192A
Cited
US4180475A
Cited
JPS5441285A
Cited
JPS5443189A
Cited
US4372871A
Cited
JPS55152777A
Cited
US4391730A
Cited
GB2067586A
Cited
US4564694A
Cited
JPS59221377A
Cited
EP0137210A2
Cited
US4643841A
Cited
JPS60184587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |