Claims
- 1. A silicate-free, aqueous composition for use in continuously bleaching a cellulosic material in a tunnel washer, said silicate-free, aqueous composition consisting of hydrogen peroxide, potassium hydroxide and water, wherein said silicate-free, aqueous composition has a ratio of hydrogen peroxide to potassium hydroxide of about 3:1 by weight.
- 2. The silicate-free, aqueous composition as claimed in claim 1, wherein said silicate-free, aqueous composition yields a bleached cellulosic material having less than about 0.65% extractable solids as measured by the Soxhlet Extraction Procedure with petroleum ether as the solvent.
- 3. The silicate-free, aqueous composition of claim 1, wherein the hydrogen peroxide is present at a concentration of about 2 weight percent.
- 4. The silicate-free, aqueous composition as claimed in claim 1, wherein the potassium hydroxide is present at a concentration of about 1 weight percent.
- 5. The silicate-free, aqueous composition of claim 1, wherein said silicate-free, aqueous composition yields a bleached cellulosic material having a Hunter Whiteness Scale Value of greater than about 110.
- 6. The silicate-free, aqueous composition as claimed in claim 5, wherein said silicate-free, aqueous composition yields said bleached cellulosic material having less than about 0.65% extractable solids as measured by the Soxhlet Extraction Procedure with petroleum ether as the solvent.
Parent Case Info
This application is a continuation of Ser. No. 08/746,583 filed Nov. 12, 1996 now U.S. Pat. No. 5,912,404, which is a continuation of Ser. No. 08/450,302 filed May 25, 1995 now abandoned, which is a continuation of Ser. No. 08/334,453 filed Nov. 4, 1994 now U.S. Pat. No. 5,482,516, which is a continuation of Ser. No. 08/067,515 filed May 24, 1993, now abandoned.
US Referenced Citations (12)
Continuations (4)
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Number |
Date |
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Parent |
746583 |
Nov 1996 |
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Parent |
450302 |
May 1995 |
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Parent |
334453 |
Nov 1994 |
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Parent |
067515 |
May 1993 |
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