US4348204A
Expired / Lapsed
US
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Aqueous dyestuff formulation, a process for its preparation and its use for dyeing and printing
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1981-04-01
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Granted: 1982-09-07
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Expires: 2001-04-01
Abstract
Abstract The aqueous dyestuff formulation of an tetrakisazo direct dyestuff which is stable to alkali and contains at least one aromatic hydroxyl group and/or enol group and at least one group conferring solubility in water, or a mixture of such azo direct dyestuffs, is characterized in that it has a pH value equal to or greater than 12 and is prepared by mixing an azo direct dyestuff which is stable to alkali, water and a tertiary alkali metal phosphate and/or alkali metal metasilicate and/or alkali metal hydroxide, and by choosing the proportions such that the dyestuff formulation contains 5 to 50% by weight of dyestuff and has a pH value equal to or greater than 12. The dyestuff formulation is used, after dilution with water, for dyeing and printing natural or synthetic materials containing hydroxyl groups.
Inventors
- 👤 Wolfgang Bauer
- 👤 Heinz Dickmanns
- 👤 Konstantin Morgenroth
- 👤 Kuno Reh
- 👤 Joachim Ribka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:03
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0072; C09B67/0073; Y; Y10; Y10S; Y10S534/00; Y10S534/01; Y10S8/00; Y10S8/916; Y10S8/918; Y10S8/919
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
Aqueous dyestuff solution of a tetrakisazo direct dyestuff which is stable to alkali and contains at least one aromatic hydroxyl or enol group and at least two groups conferring solubility in water, or a mixture of such azo direct dyestuffs, said solution having a pH value of at least 12, and a dyestuff concentration of 5 to 50% by weight.
Claim 2
Dependent Claim
60 words
Aqueous dyestuff solution of a tetrakisazo direct dyestuff which is stable to alkali and contains at least one aromatic hydroxyl or enol group and at least two groups conferring solubility in water, or a mixture of such azo direct dyestuffs, said solution having a pH value of at least 12, and a dyestuff concentration of 5 to 50% by weight.
Claim 3
Dependent Claim
29 words
Dyestuff solution according to claim 1, wherein the tetrakisazo direct dyestuff contains 1 to 4 aromatic hydroxyl or enol groups and 2 to 5 groups conferring solubility in water.
Claim 4
Dependent Claim
22 words
Dyestuff solution according to either claim 1 or 2 wherein said solution has a dyestuff concentration of 10 to 30% by weight.
Claim 5
Dependent Claim
24 words
Dyestuff solution according to claim 1 which contains 5 to 40% by weight of a hydrotropic compound or of a mixture of hydrotropic compounds.
Claim 6
Dependent Claim
11 words
Dyestuff solution according to claim 1 wherein tetrakisazo dyestuff is ##STR13##
Claim 7
Dependent Claim
23 words
Dyestuff solution according to claim 1 which contains the dyestuff C.I. Direct Black 22, C.I. Direct Black 32 or C.I. Direct Black 19.
Claim 8
Dependent Claim
90 words
The process for preparing the dyestuff solution according to claim 1 comprising mixing (a) a tetrakisazo dyestuff having at least one aromatic hydroxyl or enol group and at least 2 groups conferring solubility in water, (b) water, and (c) a member selected from the group of tertiary alkali metal phosphate, alkali metal metasilicate, alkali metal hydroxide and mixtures thereof; with the quantitative proportions of (a), (b) and (c) chosen such that the dyestuff formulation contains 10 to 50% by weight of dyestuff and has a pH of at least 12.
Claim 9
Dependent Claim
37 words
In the process of dyeing and printing natural or synthetic materials containing hydroxyl groups according to the pad-steam process with an aqueous dyestuff solution, the improvement comprises said dyestuff solution being a solution according to claim 1.
References Cited (Backward Citations)
US1981027A
Cited
FR882563A
Cited
US2489463A
Cited
BE639436A
Cited
DE1297071B
Cited
US3551088A
Cited
US3957425A
Cited
US4118182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |