US4410445A
Expired / Lapsed
US
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Liquid-crystalline dielectric having a steep characteristic curve
Assignee: Merck Patent GmbH
•
Filing: 1981-06-22
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Granted: 1983-10-18
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Expires: 2001-06-22
Abstract
Abstract Liquid crystalline dielectrics having steep characteristic curves comprise 5-85% by weight of at least one carboxylic acid ester of formula (I) R.sub.1 --X--R.sub.2 (I) wherein X is --CO--O-- or --O--CO--, R 1 is alkyl of 1-7 C atoms, R 2 is ##STR1## and R is alkyl of 1-7 C atoms which can be the same or different from R 1 , and 95-15% by weight of at least one compound of the formulae (II) to (VI), ##STR2## wherein n is 1 or 2, Z is R', OR' or CN, R and R' being the same or different, and each being alkyl of 1-7 C atoms.
Inventors
- 👤 Gunter Baur
- 👤 Bernd Scheuble
- 👤 Georg Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A liquid crystalline dielectric, comprising (i) 5-85% by weight of at least one carboxylic acid ester of formula (I) R.sub.1 --X--R.sub.2 (I) wherein X is --CO--O-- or --O--CO--, R 1 is alkyl of 1-7 C atoms, R 2 is ##STR16## and R is alkyl of 1-7 C atoms which can be the same or different from R 1 , and (ii) 95-15% by weight of at least one compound of the formulae A-C, ##STR17## wherein n is 1 or 2, Z is R', OR' or CN, R and R' being the same or different, and each being alkyl of 1-7 C atoms.
Claim 2
Dependent Claim
102 words
A liquid crystalline dielectric, comprising (i) 5-85% by weight of at least one carboxylic acid ester of formula (I) R.sub.1 --X--R.sub.2 (I) wherein X is --CO--O-- or --O--CO--, R 1 is alkyl of 1-7 C atoms, R 2 is ##STR16## and R is alkyl of 1-7 C atoms which can be the same or different from R 1 , and (ii) 95-15% by weight of at least one compound of the formulae A-C, ##STR17## wherein n is 1 or 2, Z is R', OR' or CN, R and R' being the same or different, and each being alkyl of 1-7 C atoms.
Claim 3
Dependent Claim
18 words
A liquid-crystalline dielectric of claim 1, comprising at least one compound of formula I wherein X is --CO--O--.
Claim 4
Dependent Claim
21 words
A liquid-crystalline dielectric of claim 1 comprising 8-60% by weight of at least one carboxylic acid ester of formula (Ib) ##STR18##
Claim 5
Dependent Claim
21 words
A liquid-crystalline dielectric of claim 1 comprising 8-60% by weight of at least one carboxylic acid ester of formula (Ic) ##STR19##
Claim 6
Dependent Claim
27 words
A liquid-crystalline dielectric of claim 1 wherein the alkyl groups R 1 and R in the compounds of formula (I) contain a total of 5-11 C atoms.
Claim 7
Dependent Claim
18 words
A liquid-crystalline dielectric of claim 1 wherein each compound of formulae (A) to (C) has a cyano group.
Claim 8
Dependent Claim
32 words
A liquid-crystalline dielectric of claim 1 comprising 8-60% by weight of at least one compound of formula (I) and 92-40% by weight of at least one compound of formulae (A) to (C).
Claim 9
Dependent Claim
12 words
A liquid-crystalline dielectric of claim 1 wherein all alkyl groups are straight-chained.
Claim 10
Dependent Claim
15 words
An electro-optical display device having a liquid crystal cell comprising a dielectric of claim 1.
Claim 11
Dependent Claim
17 words
An electro-optical display device of claim 9 wherein the liquid crystal cell is a twisted nematic cell.
Claim 12
Dependent Claim
20 words
A liquid crystalline dielectric of claim 1 wherein component (ii) comprises a compound of formula A wherein n is 2.
Claim 13
Dependent Claim
16 words
A liquid crystalline dielectric of claim 1 wherein component (ii) comprises a compound of formula B.
Claim 14
Dependent Claim
16 words
A liquid crystalline dielectric of claim 1 wherein component (ii) comprises a compound of formula C.
Claim 15
Dependent Claim
14 words
A liquid crystalline dielectric of claim 1 wherein in component (i), X is --CO--O--.
Claim 16
Dependent Claim
14 words
A liquid crystalline dielectric of claim 1 wherein in component (i), X is --O--CO--.
Claim 17
Dependent Claim
12 words
A liquid crystalline dielectric of claim 1 wherein R 2 is ##STR20##
Claim 18
Dependent Claim
12 words
A liquid crystalline dielectric of claim 1 wherein R 2 is ##STR21##
Claim 19
Dependent Claim
12 words
A liquid crystalline dielectric of claim 1 wherein R 2 is ##STR22##
Claim 20
Dependent Claim
20 words
A liquid crystalline dielectric of claim 1 wherein component (ii) comprises a compound of formula A wherein n is 1.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |