US4155872A
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Nematic liquid crystal compositions
Assignee: Sharp Corp
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Filing: 1977-12-14
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Granted: 1979-05-22
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Expires: 1997-12-14
Abstract
Abstract Nematic liquid crystal compositions containing at least one primary, secondary or tertiary aliphatic amine salt of aliphatic or aromatic monocarboxylic acids outstanding in the response speed and in the ability to produce a high degree of turbidity, low in the temperature dependence of conductivity (current) and having the long axes of the liquid crystal molecules uniformly oriented perpendicular to electrode base plates when filling the space between the base plates.
Inventors
- 👤 Minezaki Shigehiro
- 👤 Funada Fumiaki
- 👤 Matsuura Masataka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/582
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A nematic liquid crystal composition which comprises a nematic liquid crystal material having negative dielectric anisotropy and at least one salt of an aliphatic amine of the formula (I): ##STR8## wherein A is an unsubstituted alkyl group having 7-25 carbon atoms, and R 1 and R 2 may be the same or different and are each a hydrogen atom, a lower alkyl group of 1-4 carbon atoms or a benzyl group, with an aliphatic or aromatic monocarboxylic acid of the formula (II): x--cooh (ii) wherein X is a group of the formula C m H 2m+1 in which m is an integer of 1-6 or a group of the formula ##STR9## in which X 1 and X 2 may be the same or different and are each a hydrogen, bromine or chlorine atom or a nitro, methyl or methoxy group, said salt being present in an amount of about 0.05-3.0% by weight, based on the nematic liquid crystal material.
Claim 2
Dependent Claim
159 words
A nematic liquid crystal composition which comprises a nematic liquid crystal material having negative dielectric anisotropy and at least one salt of an aliphatic amine of the formula (I): ##STR8## wherein A is an unsubstituted alkyl group having 7-25 carbon atoms, and R 1 and R 2 may be the same or different and are each a hydrogen atom, a lower alkyl group of 1-4 carbon atoms or a benzyl group, with an aliphatic or aromatic monocarboxylic acid of the formula (II): x--cooh (ii) wherein X is a group of the formula C m H 2m+1 in which m is an integer of 1-6 or a group of the formula ##STR9## in which X 1 and X 2 may be the same or different and are each a hydrogen, bromine or chlorine atom or a nitro, methyl or methoxy group, said salt being present in an amount of about 0.05-3.0% by weight, based on the nematic liquid crystal material.
Claim 3
Dependent Claim
30 words
The nematic liquid crystal composition of claim 1 wherein the salt is present in an amount of about 0.1 ˜ 2.5% by weight, based on the nematic liquid crystal material.
Claim 4
Dependent Claim
24 words
The nematic liquid crystal composition of claim 1 wherein the alkyl group of the symbol A is one having 8 ˜ 16 carbon atoms.
Claim 5
Dependent Claim
23 words
The nematic liquid crystal composition of claim 1 wherein the aliphatic amine is n-octylamine, n-dodecylamine, n-hexadecylamine, N,N-dimethyl-n-octylamine, N,N-dimethyldodecylamine, N,N-dimethyl-n-hexadecylamine, N-methyl-N-benzyl-n-octylamine, N-methyl-N-benzyl-n-dodecylamine or N-methyl-N-benzyl-n-hexadecylamine.
Claim 6
Dependent Claim
19 words
The nematic liquid crystal composition of claim 1 wherein the aliphatic monocarboxylic acid is propionic acid or hexanoic acid.
Claim 7
Dependent Claim
29 words
The nematic liquid crystal composition of claim 1 wherein the aromatic monocarboxylic acid is benzoic acid, p-nitrobenzoic acid, p-bromobenzoic acid, 2,4-dinitrobenzoic acid, 3,5-dinitrobenzoic acid, 3,5-dimethylbenzoic acid or 3,4-dimethoxybenzoic acid.
Claim 8
Dependent Claim
18 words
The nematic liquid crystal composition of claim 1 wherein the salt is 2,4 (or 3,5) -dinitrobenzoate of N,N-dimethyl-n-dodecylamine.
Claim 9
Dependent Claim
18 words
The nematic liquid crystal composition of claim 1 wherein the salt is 2,4 (or 3,5) -dinitrobenzoate of N-methyl-N-benzyl-n-dodecylamine.
Claim 10
Dependent Claim
18 words
The nematic liquid crystal composition of claim 1 wherein the salt is 2,4 (or 3,5) -dinitrobenzoate of N,N-dimethyl-n-octylamine.
Claim 11
Dependent Claim
18 words
The nematic liquid crystal composition of claim 1 wherein the salt is 2,4 (or 3,5) -dinitrobenzoate of N,N-dimethyl-n-hexadecylamine.
References Cited (Backward Citations)
US3656834A
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US3956168A
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GB1436756A
Cited
US3963638A
Cited
DE2629698A1
Cited
NL7702992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |