US4060385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for hydrogen peroxide bleaching in acid or neutral solutions
Assignee: Individual
•
Filing: 1975-09-02
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Granted: 1977-11-29
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Expires: 1995-09-02
Abstract
Abstract A process for scouring, desizing and bleaching cotton greige goods comprising immersing the goods for a time sufficient to achieve commercial brightness in an aqueous solution having a temperature in the range from 100° to 212° F and consisting of from 3 to 70% of volume hydrogen peroxide, water and sufficient hydroxide, if necessary, to adjust the solution of a pH in the range 2 to 7, the solution being substantially free of heavy metal ions and maintained out of contact with all metals while the goods are immersed therein and cycling a portion of the solution through a filtration means to remove solid impurities therefrom while maintaining the volume, composition and pH of the solution in contact with the goods substantially the same. In a preferred form of the invention, the scouring, desizing and bleaching are accomplished simultaneously. In another embodiment of the invention, the goods are immersed in alkaline scour solution for from 5 seconds to 31/2 minutes prior to bleaching in the hydrogen peroxide solution, the alkaline scour solution having a temperature in the range 160° to 212° F and a pH from 10 to 14. In still another embodiment of the invention, the goods are immersed in an alkaline scour solution and an acid solution, in any sequence, prior to bleaching in the hydrogen peroxide solution.
Inventors
- 👤 Jerome Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/12; D06L1/14; D06L4/00; D06L4/10; D06L4/13; D06L4/70; D06L4/75
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
149 words
A process for scouring, desizing and bleaching cotton griege goods comprising the steps of: a. immersing said goods for a time sufficient to achieve commercial brightness but less than about 30 minutes in an aqueous solution having a temperature in the range from 112° to 212° F and consisting of from 3 to 70% by volume hydrogen peroxide, water and sufficient hydroxide to adjust said solution to a pH in the range 2 to 7, said solution being substantially free of heavy metal ions and maintained out of contact with all metals while said goods are immersed therein; b. cycling a portion of said solution through a filtration means to remove solid impurities therefrom while maintaining the volume, composition and pH of said solution in contact with said goods substantially the same; c. rinsing said goods with water to wash said aqueous solution therefrom; and d. drying said goods.
Claim 2
Dependent Claim
149 words
A process for scouring, desizing and bleaching cotton griege goods comprising the steps of: a. immersing said goods for a time sufficient to achieve commercial brightness but less than about 30 minutes in an aqueous solution having a temperature in the range from 112° to 212° F and consisting of from 3 to 70% by volume hydrogen peroxide, water and sufficient hydroxide to adjust said solution to a pH in the range 2 to 7, said solution being substantially free of heavy metal ions and maintained out of contact with all metals while said goods are immersed therein; b. cycling a portion of said solution through a filtration means to remove solid impurities therefrom while maintaining the volume, composition and pH of said solution in contact with said goods substantially the same; c. rinsing said goods with water to wash said aqueous solution therefrom; and d. drying said goods.
Claim 3
Dependent Claim
35 words
A process, as claimed in claim 1, wherein said aqueous solution includes 3 to 50% by volume hydrogen peroxide at 160° to 212° F, said goods being immersed therein for less than about 15 minutes.
Claim 4
Dependent Claim
36 words
A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 160° to 212° F, a pH of 6 to 7, and includes 10 to 50% by volume hydrogen peroxide.
Claim 5
Dependent Claim
21 words
A process, as claimed in claim 3, wherein said goods are immersed in said solution for less than about 31/2 minutes.
Claim 6
Dependent Claim
36 words
A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 195° to 212° F, a pH of 2 to 3 and includes 30 to 70% by volume hydrogen peroxide.
Claim 7
Dependent Claim
21 words
A process, as claimed in claim 5, wherein said goods are immersed in said solution for less than about 7 minutes.
Claim 8
Dependent Claim
36 words
The process, as claimed in claim 1, wherein said process includes the steps of maintaining said solution in a plurality of containers and successively immersing said goods into the solution in different ones of said containers.
Claim 9
Dependent Claim
22 words
A process, as claimed in claim 7, wherein the portion of each of said containers in contact with said solution is glass.
Claim 10
Dependent Claim
14 words
A process, as claimed in claim 1, wherein said hydrogen peroxide is electronic grade.
Claim 11
Dependent Claim
24 words
A process as claimed in claim 1, wherein said water of said solution is selected from the group consisting of deionized and distilled water.
Claim 12
Dependent Claim
15 words
A process, as claimed in claim 1, wherein said solution further includes a fluorescent whitener.
Claim 13
Dependent Claim
17 words
A process as claimed in claim 1, wherein said process is continuous and said cycling is continuous.
Claim 14
Dependent Claim
41 words
A process, as claimed in claim 1, wherein said simultaneous scouring, desizing and bleaching is accomplished by immersing said goods in a single tank containing said solution and said cycled portion of said solution is continuously purified to remove contaminants therefrom.
Claim 15
Dependent Claim
65 words
A process, as claimed in claim 1, including the step of immersing said goods in water for up to 31/2 minutes prior to immersing said goods in said hydrogen peroxide solution, said water having a temperature from just above ambient to 212° F and being substantially free of heavy metal ions and maintained out of contact with all metals while said goods are immersed therein.
Claim 16
Dependent Claim
19 words
A process, as claimed in claim 14, wherein said water temperature is in the range 104° to 212° F.
Claim 17
Dependent Claim
57 words
A process, as claimed in claim 1, including the step of immersing said goods in an alkaline scour solution for from 5 seconds to 31/2 minutes prior to immersing said goods in said hydrogen peroxide solution, said alkaline scour solution having a temperature in the range 160° - 212° F and a pH from 10 to 14.
Claim 18
Dependent Claim
23 words
A process, as claimed in claim 16, wherein said goods are immersed in said alkaline scour solution for from 1 to 3 minutes.
Claim 19
Dependent Claim
19 words
A process, as claimed in claim 17, wherein said alkaline scour solution is in the range 11.8 to 13.5.
Claim 20
Dependent Claim
21 words
A process, as claimed in claim 18, wherein said alkaline scour solution temperature is in the range 185° to 212° F.
Claim 21
Dependent Claim
21 words
A process, as claimed in claim 16, wherein said alkaline scour solution contains 1 to 10% by volume hydrogen peroxide therein.
Claim 22
Dependent Claim
45 words
A process, as claimed in claim 16, wherein a portion of said alkaline scour solution is cycled through a purification means to remove impurities therefrom while maintaining the volume, composition and pH of said alkaline scour solution in contact with said goods substantially the same.
Claim 23
Dependent Claim
54 words
A process, as claimed in claim 16, including the step of immersing said goods in an acid solution for from 1 to 10 seconds prior to immersing said goods in said hydrogen peroxide solution, said acid solution having a temperature in the range 45° to 212° F and a pH less than about 3.
Claim 24
Dependent Claim
16 words
A process, as claimed in claim 22, wherein said acid solution pH is 0.5 to 1.
Claim 25
Dependent Claim
19 words
A process, as claimed in claim 22, wherein said solution temperature is in the range 45° to 100° F.
Claim 26
Dependent Claim
22 words
A process, as claimed in claim 22, wherein said goods are immersed in said acid solution for from 1 to 5 seconds.
Claim 27
Dependent Claim
43 words
A process, as claimed in claim 22, wherein a portion of said acid solution is cycled through a purification means to remove impurities therefrom while maintaining the volume, composition and pH of said acid solution in contact with said goods substantially the same.
Claim 28
Dependent Claim
25 words
A process, as claimed in claim 22, wherein said goods are immersed in said acid solution prior to being immersed in said alkaline scour solution.
Claim 29
Dependent Claim
25 words
A process, as claimed in claim 22, wherein said goods are immersed in said alkaline scour solution prior to being immersed in said acid solution.
Claim 30
Dependent Claim
36 words
A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 100° to 150° F, a pH of 6.0 to 7, and includes 30 to 70% by volume hydrogen peroxide.
Claim 31
Dependent Claim
19 words
A process, as claimed in claim 29, wherein said aqueous solution includes 40 to 70% by volume hydrogen peroxide.
Claim 32
Dependent Claim
16 words
A process, as claimed in claim 29, wherein said solution temperature is above about 120° F.
Claim 33
Dependent Claim
21 words
A process, as claimed in claim 15, wherein said immersion time in said hydrogen peroxide solution does not exceed 31/2 minutes.
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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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |