US4285695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting crust formation in reduced dye baths
Assignee: Olin Corp
•
Filing: 1979-10-30
•
Granted: 1981-08-25
•
Expires: 1999-10-30
Abstract
Abstract An improved sodium hydrosulfite dye reducing composition is described for reducing vat or sulfur dye in aqueous dye bath solutions, comprised of sodium dithionite, at least 1 percent sodium sulfite by weight of sodium dithionite, and stabilized by alkali metal hydroxide, the improvement characterized by including in this composition an effective surface crust inhibiting amount of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl aryl phosphate esters, N-acyl-N-alkyl taurates, alpha -olefin sulfonates, alkyl aryl disulfonates, dodecylated oxydibenzene sulfonates, and mixtures thereof.
Inventors
- 👤 Richard L. Doerr
- 👤 Michael Scardera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:18
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0077; D; D06; D06P; D06P1/00; D06P1/22; D06P1/221; D06P1/44; D06P1/62; D06P1/667
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
In an aqueous sodium hydrosulfite composition for reducing vat or sulfur dye in an aqueous dye bath solution, comprising greater than about 10 percent by weight sodium dithionite, at least 1 percent sodium sulfite by weight of sodium dithionite, and stabilized by alkali metal hydroxide, the improvement characterized by including in said composition an effective surface crust inhibiting amount of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl aryl phosphate esters, N-acyl-N-alkyl taurates, α-olefin sulfonates, alkyl aryl disulfonates, dodecylated oxydibenzene sulfonates, and mixtures thereof, said effective surface crust inhibiting amount being in the range from about 0.002 to about 4.0 percent by weight of said sodium hydrosulfite composition.
Claim 2
Dependent Claim
112 words
In an aqueous sodium hydrosulfite composition for reducing vat or sulfur dye in an aqueous dye bath solution, comprising greater than about 10 percent by weight sodium dithionite, at least 1 percent sodium sulfite by weight of sodium dithionite, and stabilized by alkali metal hydroxide, the improvement characterized by including in said composition an effective surface crust inhibiting amount of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl aryl phosphate esters, N-acyl-N-alkyl taurates, α-olefin sulfonates, alkyl aryl disulfonates, dodecylated oxydibenzene sulfonates, and mixtures thereof, said effective surface crust inhibiting amount being in the range from about 0.002 to about 4.0 percent by weight of said sodium hydrosulfite composition.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein said alkali metal hydroxide is an aqueous solution of sodium hydroxide.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein said alkali metal hydroxide is an aqueous solution of potassium hydroxide.
Claim 5
Dependent Claim
30 words
The composition of claim 3 wherein the concentration of said aqueous solution of potassium hydroxide is in the range from about 1 to about 12 grams potassium hydroxide per liter.
Claim 6
Dependent Claim
13 words
The composition of claim 4 wherein said alkyl sulfate is sodium lauryl sulfate.
Claim 7
Dependent Claim
14 words
The composition of claim 4 wherein said anionic surfactant is an alkyl aryl disulfonate.
Claim 8
Dependent Claim
32 words
The composition of claim 5 wherein the concentration of said effective amount of anionic surfactant is in the range from about 0.002 to about 4.0 percent by weight of sodium hydrosulfite composition.
Claim 9
Dependent Claim
32 words
The composition of claim 7 wherein the concentration of said effective amount of anionic surfactant is in the range from about 0.01 to about 0.2 percent by weight of sodium hydrosulfite composition.
Claim 10
Dependent Claim
32 words
The composition of claim 8 wherein the concentration of said effective amount of anionic surfactant is in the range from about 0.025 to about 0.10 percent by weight of sodium hydrosulfite composition.
Claim 11
Dependent Claim
35 words
In a process for reducing vat or sulfur dyes in an aqueous dye bath solution with a sodium hydrosulfite composition, the improvement characterized by employing as the sodium hydrosulfite composition the composition of claim 1.
Claim 12
Dependent Claim
33 words
In a process for reducing indigo dye in an aqueous dye bath solution with a sodium hydrosulfite composition, the improvement characterized by employing as the sodium hydrosulfite composition the composition of claim 7.
Claim 13
Dependent Claim
35 words
In a process for reducing vat or sulfur dyes in an aqueous dye bath solution with a sodium hydrosulfite composition, the improvement characterized by employing as the sodium hydrosulfite composition the composition of claim 8.
Claim 14
Dependent Claim
19 words
The composition of claim 1 wherein said sodium hydrosulfite composition comprises greater than about 13 percent of sodium dithionite.
Claim 15
Dependent Claim
18 words
The composition of claim 4 wherein said dodecylated oxydibenze sulfonate is the sodium salt of dodecylated oxydibenzene sulfonate.
References Cited (Backward Citations)
US1881745A
Cited
US1794805A
Cited
US1915326A
Cited
US2233101A
Cited
US3054658A
Cited
US3353909A
Cited
US3468623A
Cited
US4166717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |