US4446047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pleochroic anthraquinone dyes
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1982-08-24
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Granted: 1984-05-01
•
Expires: 2002-08-24
Abstract
Abstract An anthraquinone dye from water-solubilizing and ionic substituents of the general formula: <IMAGE> wherein Q is NH2, OH, alkyl, aryl, NO2 or halo; n is 0 to 4; each X independently is H, -SR, -NZ1 Z2 or Q; each R independently is alkyl, aryl or cycloalkyl; Z1 & Z2 are independently H, alkyl, cycloalkyl or aryl; provided that there are at least two different -SR groups and that where only two X's represent -SR groups at least one R is aryl and the two -SR groups are in the 1 & 5 or the 1 & 8 positions. In addition to the normal textile applications the dye is suitable for use in the coloration of liquid crystals for electro-optic displays.
Inventors
- 👤 David J. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:31
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/56; C09B1/58; C09B1/02; C09B1/06; C09B1/50; C09B1/51; C09B1/515; C09B1/585
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
An anthraquinone dye of the formula: ##STR21## wherein L & M are H or CH 2 K 1 ; X 4 & X 5 are OH or SR 2 provided that when X 4 is OH X 5 is SR 2 , L is CH 2 K 2 and M is H; and when X 5 is OH X 4 is SR 2 , M is CH 2 K 2 and L is H; K 1 & K 2 are C 1-20 -alkyl; R 1 is mono- or bi-cyclic aryl; and R 2 is different to R 1 and selected from C 1-20 -alkyl, mono- or bi-cyclic aryl and C 4-8 -cycloalkyl.
Claim 2
Dependent Claim
112 words
An anthraquinone dye of the formula: ##STR21## wherein L & M are H or CH 2 K 1 ; X 4 & X 5 are OH or SR 2 provided that when X 4 is OH X 5 is SR 2 , L is CH 2 K 2 and M is H; and when X 5 is OH X 4 is SR 2 , M is CH 2 K 2 and L is H; K 1 & K 2 are C 1-20 -alkyl; R 1 is mono- or bi-cyclic aryl; and R 2 is different to R 1 and selected from C 1-20 -alkyl, mono- or bi-cyclic aryl and C 4-8 -cycloalkyl.
Claim 3
Dependent Claim
74 words
An anthraquinone dye of the formula: ##STR22## wherein X 2 and X 3 are selected from OH and --SR 2 provided that when X 2 is OH X 3 is --SR 2 and when X 3 is OH X 2 is --SR 2 ; each Q is C 1-20 -alkyl and adjacent to an OH group; and R 1 & R 2 are different and selected from alkyl, mono- or bi-cyclic aryl and cycloalkyl.
Claim 4
Dependent Claim
74 words
An anthraquinone dye of the formula: ##STR22## wherein X 2 and X 3 are selected from OH and --SR 2 provided that when X 2 is OH X 3 is --SR 2 and when X 3 is OH X 2 is --SR 2 ; each Q is C 1-20 -alkyl and adjacent to an OH group; and R 1 & R 2 are different and selected from alkyl, mono- or bi-cyclic aryl and cycloalkyl.
Claim 5
Dependent Claim
33 words
An anthraquinone dye according to claim 2 or claim 1 wherein at least one of the alkyl, aryl and cycloalkyl radicals represented by R 1 and R 2 , carries a non-ionic substituent.
Claim 6
Dependent Claim
25 words
An anthraquinone dye according to claim 3 wherein the substituent on the aryl radical is selected from C 1-10 -alkyl, C 4-8 -cycloalkyl and phenyl.
Claim 7
Dependent Claim
44 words
A composition comprising at least one unsymmetrical di(substituted thio)anthraquinone dye according to claim 2 or claim 1, in which the two substituted thio groups are different and at least one symmetrical di(substituted thio) anthraquinone dye, in which the two substituted thio groups are identical.
Claim 8
Dependent Claim
18 words
A composition according to claim 5 containing at least 50%, by weight, of the unsymmetrical di(substituted thio)anthraquinone dye.
Claim 9
Dependent Claim
39 words
An anthraquinone dye or composition according to claim 1 or claim 2 wherein the product of the molar extinction of the dye or composition and the solubility of the dye (in moles/liter) is at least 500 cm -1 .
Claim 10
Dependent Claim
1 words
1,8-Dihydroxy-2,7-di-n-heptyl-4-phenylthio-5-(4-t-butylphenylthio)anthraquinone.
Claim 11
Dependent Claim
1 words
1,8-Dihydroxy-2,7-di-n-heptyl-4-phenylthio-5-(4-t-butylphenylthio)anthraquinone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |