US4359398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compositions with novel tris-azo dichroic dyes
Assignee: Ametek Inc
•
Filing: 1980-12-22
•
Granted: 1982-11-16
•
Expires: 2000-12-22
Abstract
Abstract Novel tris-azo dyes and a liquid crystal composition containing the tris-azo dyes. The tris-azo dyes are of the general formula: ##STR1## wherein R 1 and R 2 are various aromatic groups including aromatic amines, substituted aromatic amines, hydroxy-substituted aromatic groups and substituted hydroxy-containing aromatic groups. When the tris-azo dichroic dyes are used as a guest dye in a host liquid crystal material, they form a novel liquid crystal composition for use in liquid crystal displays.
Inventors
- 👤 Herbert S. Cole, Jr.
- 👤 Siegfried Aftergut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/601; C09B; C09B35/00; C09B35/35
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A liquid crystal composition for use in a liquid crystal display, comprising host liquid crystal material and at least one guest dichroic dye having a maximum absorption greater than about 580 nm and having an order parameter of at least 0.70 as dissolved in said liquid material of the general formula, ##STR47## where R 1 and R 2 are selected from aromatic amine groups of the formula ##STR48## R 7 is selected from the class consisting of hydrogen, C.sub.(1-6) alkyl, aryl, arylalkyl and alkyl amine, R 8 is selected from the class consisting of hydrogen, C.sub.(1-6) alkyl, alkyl amine, alkoxy and halogen, and R 9 and R 10 are selected from the class consisting of hydrogen, C.sub.(1-3) alkyl, alkoxy and halogen.
Claim 2
Dependent Claim
121 words
A liquid crystal composition for use in a liquid crystal display, comprising host liquid crystal material and at least one guest dichroic dye having a maximum absorption greater than about 580 nm and having an order parameter of at least 0.70 as dissolved in said liquid material of the general formula, ##STR47## where R 1 and R 2 are selected from aromatic amine groups of the formula ##STR48## R 7 is selected from the class consisting of hydrogen, C.sub.(1-6) alkyl, aryl, arylalkyl and alkyl amine, R 8 is selected from the class consisting of hydrogen, C.sub.(1-6) alkyl, alkyl amine, alkoxy and halogen, and R 9 and R 10 are selected from the class consisting of hydrogen, C.sub.(1-3) alkyl, alkoxy and halogen.
Claim 3
Dependent Claim
21 words
The liquid crystal composition of claim 1, wherein the host material is a nematic liquid crystal or a cholesteric liquid crystal.
Claim 4
Dependent Claim
35 words
The liquid crystal composition of claim 2, wherein about 0.05% by weight to about 1.0% by weight (based upon the weight of the liquid crystal) of dichroic dye is dissolved in the host liquid crystal.
Claim 5
Dependent Claim
13 words
The liquid crystal composition of claim 2, wherein R 1 =R 2 .
Claim 6
Dependent Claim
24 words
The liquid crystal composition of claim 4, wherein R 7 is hydrogen, methyl or ethyl, and R 8 is methyl, ethyl, aminoethyl or phenyl.
Claim 7
Dependent Claim
14 words
The liquid crystal composition of claim 4, wherein said guest dichroic dye is 4,4'-bis(4-N-ethylaminonaphthylazo)-2,5-dimethylazobenzene.
Claim 8
Dependent Claim
28 words
The liquid crystal composition of claim 4, wherein said host liquid crystal material contains at least one other guest dichroic dyes so as to realize a given color.
Claim 9
Dependent Claim
24 words
The liquid crystal composition of claim 7, wherein said guest dichroic dye and other dichroic dyes are in proportion to realize a black display.
References Cited (Backward Citations)
US4145114A
Cited
US4128497A
Cited
US4128496A
Cited
US4122027A
Cited
US4141627A
Cited
US4153343A
Cited
US4116861A
Cited
US4137143A
Cited
JPS55127485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |