US4356102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dichroic liquid crystal compositions containing anthraquinone-based dyes
Assignee: Ametek Inc
•
Filing: 1980-10-22
•
Granted: 1982-10-26
•
Expires: 2000-10-22
Abstract
Abstract Liquid crystal compositions having guest anthraquinone-based dyes dissolved therein, are disclosed. The anthraquinone-based dyes have the general formula: ##STR1## wherein at least one of X and X' is a 5-membered ring connected to the lateral positions of the lateral benzene rings in the anthraquinone molecule, the five membered ring having the structure: ##STR2## wherein R is an alkoxy alkyl radical, a straight chain or branched chain alkyl radical, a phenyl radical, a benzyl radical and/or substituted derivatives of the foregoing radicals. The anthraquinone-based dyes of the invention may be used alone or with other compatible dyes as guest dyes to form various colors for coloring the host liquid crystal compositions. One preferred class of guest anthraquinone-based dyes which are dissolved in the host liquid crystal material, are various derivatives of 1,4-diamino-2,3-anthraquinone-dicarboximide.
Inventors
- 👤 Sigfried Aftergut
- 👤 Herbert S. Cole, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:11
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/603; C09B; C09B5/00; C09B5/24; C09B5/2409; C09B5/2436; C09B5/2445; C09B5/2454; C09B5/2463; C09B5/2472
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A liquid crystal composition comprising: a host liquid crystal material; and at least one guest anthraquinone dye dissolved in said host liquid crystal material, said anthraquinone dye having the general formula: ##STR30## wherein R is selected from the group consisting of: a cyclohexyl radical; a phenyl radical; a benzyl radical; a substituted phenyl radical having the formula: ##STR31## a substituted benzyl radical having the formula: ##STR32## where R" is in the para-position and is selected from the group consisting of halogen, cyano, nitro, alkoxy, hydroxyl, amino, alkylamino, dialkylamino, alkyl wherein the alkyl is from about 1 to about 10 carbon atoms, arylamino and esters having the formula: ##STR33## wherein R' is selected from the group consisting of alkyl, substituted alkyl, aryl and substituted aryl; R"' is hydrogen or alkyl having from about 1 to about 3 carbon atoms; and n is an integer from 0 to 5.
Claim 2
Dependent Claim
147 words
A liquid crystal composition comprising: a host liquid crystal material; and at least one guest anthraquinone dye dissolved in said host liquid crystal material, said anthraquinone dye having the general formula: ##STR30## wherein R is selected from the group consisting of: a cyclohexyl radical; a phenyl radical; a benzyl radical; a substituted phenyl radical having the formula: ##STR31## a substituted benzyl radical having the formula: ##STR32## where R" is in the para-position and is selected from the group consisting of halogen, cyano, nitro, alkoxy, hydroxyl, amino, alkylamino, dialkylamino, alkyl wherein the alkyl is from about 1 to about 10 carbon atoms, arylamino and esters having the formula: ##STR33## wherein R' is selected from the group consisting of alkyl, substituted alkyl, aryl and substituted aryl; R"' is hydrogen or alkyl having from about 1 to about 3 carbon atoms; and n is an integer from 0 to 5.
Claim 3
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-phenyl-2,3-anthraquinone dicarboximide.
Claim 4
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-(1-methylbenzyl)-2,3-anthraquinone dicarboximide.
Claim 5
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-cyclohexyl-2,3-anthraquinone dicarboximide.
Claim 6
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-p-hydroxyphenyl-2,3-anthraquinone dicarboximide.
Claim 7
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-phenylbenzoate-2,3-anthraquinone dicarboximide.
Claim 8
Dependent Claim
14 words
The liquid crystal composition of claim 1, wherein the anthraquinone dye is 1,4-diamino-N-(p-hexoxyphenyl)-2,3-anthraquinone dicarboximide.
References Cited (Backward Citations)
US2628963A
Cited
US3864022A
Cited
US3960750A
Cited
EP0002104A1
Cited
US4211473A
Cited
DE2920730A1
Cited
GB2037803A
Cited
DE2902177A1
Cited
GB2045274A
Cited
US4299720A
Cited
US4232950A
Cited
US4232949A
Cited
JPS55127485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |