US4012192A
Expired / Lapsed
US
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Oxidation of vat or sulfur dyes with vanadate activated bromate or iodate
Assignee: Olin Corp
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Filing: 1975-11-24
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Granted: 1977-03-15
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Expires: 1995-11-24
Abstract
Abstract An improved process for oxidizing vat or sulfur dyes is provided wherein the reduced form of the dye is oxidized by contact with an aqueous oxidizing agent containing in combination (a) an alkali metal, alkaline earth metal or ammonium bromate or iodate and (b) an alkali metal, alkaline earth metal or ammonium vanadate, at least one of which is an alkaline earth metal salt.
Inventors
- 👤 Richard L. Doerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:07
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/67358; D06P1/22; D06P1/222
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
In a process for oxidizing vat or sulfur dyes present in reduced form on cotton or regenerated cellulose textile fibers by contacting said dye with an aqueous oxidant solution, the improvement wherein said aqueous oxidant solution consists essentially of a. 0.01-10% of an oxidizing agent comprising an alkali metal, alkaline earth metal or ammonium bromate or iodate and b. 0.005 to 5% by weight of an alkali metal, alkaline earth metal or ammonium vanadate and wherein at least one of (a) and (b) is an alkaline earth metal, c. the remainder water.
Claim 2
Dependent Claim
92 words
In a process for oxidizing vat or sulfur dyes present in reduced form on cotton or regenerated cellulose textile fibers by contacting said dye with an aqueous oxidant solution, the improvement wherein said aqueous oxidant solution consists essentially of a. 0.01-10% of an oxidizing agent comprising an alkali metal, alkaline earth metal or ammonium bromate or iodate and b. 0.005 to 5% by weight of an alkali metal, alkaline earth metal or ammonium vanadate and wherein at least one of (a) and (b) is an alkaline earth metal, c. the remainder water.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the weight ratio of said oxidizing agent to said vanadate is 1:1 to 100:1.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said dye is a sulfur dye.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein said oxidizing agent is the alkali metal or ammonium salt and said vanadate is the alkaline earth metal salt.
Claim 6
Dependent Claim
25 words
The process of claim 3 wherein said oxidizing agent is sodium, potassium or ammonium bromate or iodate and said vanadate is magnesium or calcium vanadate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |