Patent US4011042A successfully refreshed from Google Patents.
US4011042A
Expired / Lapsed
US
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Oxidation of vat and sulfur dyes
Assignee: Olin Corp
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Filing: 1971-08-03
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Granted: 1977-03-08
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Expires: 1991-08-03
Abstract
Abstract An improvement is disclosed in the oxidation of reduced vat and sulfur dyes to develop their color and improve its fastness in dyed textiles. The improvement is in using an alkali metal bromite as an oxidizing agent for these dyes.
Inventors
- 👤 Harry Stitzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:19
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/67358; D06P1/22; D06P1/222; Y; Y10; Y10S; Y10S8/00; Y10S8/937
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
In a method for dyeing cotton or cellulose-polyester blended textiles with vat or sulfur dyes, comprising the steps of applying a vat or sulfur dye to said textile and subsequently oxidizing said dye by contacting it with an aqueous solution of an oxidizing agent the improvement wherein said aqueous solution comprises 0.005-5 percent by weight sodium bromite and has a pH of at least 6.
Claim 2
Dependent Claim
65 words
In a method for dyeing cotton or cellulose-polyester blended textiles with vat or sulfur dyes, comprising the steps of applying a vat or sulfur dye to said textile and subsequently oxidizing said dye by contacting it with an aqueous solution of an oxidizing agent the improvement wherein said aqueous solution comprises 0.005-5 percent by weight sodium bromite and has a pH of at least 6.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said dye is a vat dye.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said aqueous solution is at a temperature of 75°-205° F.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein said aqueous solution has 0.01-2.0 percent by weight sodium bromite.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said dye is a sulfur dye applied in reduced form.
Claim 7
Dependent Claim
23 words
The method of claim 4 wherein said aqueous solution is at a temperature of 75°-205° F. when it contacts the reduced sulfur dye.
Claim 8
Dependent Claim
16 words
The method of claim 5 wherein said aqueous solution has 0.01-2.0 percent by weight sodium bromite.
Claim 9
Dependent Claim
78 words
In a method for dyeing cotton or cotton-polyester textile fibers, comprising the steps of applying at least one vat or sulfur dye in reduced form to said fibers and subsequently oxidizing said dye by contacting it with an aqueous solution of an oxidizing agent, the improvement wherein said aqueous solution of an oxidizing agent comprises, by weight 0.01 to 2% sodium bromite, 0.048 to 0.099% alkali and 95 to 99.99% water, and has pH of at least 8.
Claim 10
Dependent Claim
78 words
In a method for dyeing cotton or cotton-polyester textile fibers, comprising the steps of applying at least one vat or sulfur dye in reduced form to said fibers and subsequently oxidizing said dye by contacting it with an aqueous solution of an oxidizing agent, the improvement wherein said aqueous solution of an oxidizing agent comprises, by weight 0.01 to 2% sodium bromite, 0.048 to 0.099% alkali and 95 to 99.99% water, and has pH of at least 8.
Claim 11
Dependent Claim
30 words
Method as defined in claim 8, and wherein said aqueous solution of an oxidizing agent is at 75° to 140° F. when it contacts the reduced vat or sulfur dye.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |