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US 5,066,306 AGranted
Process for removing permanganate stains from articles
Assignee501 P.B. & S. Chemical Company, Inc.
InventorJames L. Clements
Life of this patent
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Abstract
A process for bleaching articles, such as fabrics, comprising the steps of treating an article with a permanganate bleaching agent and then reducing the permanganate with a reducing composition comprised of ammonium bisulfite and ammonium sulfite.
Claims40
A bleaching process comprising the steps of:
- (a) treating a fiber, fabric, or garment with a permanganate bleaching agent;
- and
- (b) reducing the permanganate with a reducing composition containing sulfur dioxide and ammonia in amounts so that substantially no sulfur dioxide odor is detectable during the reduction step.
A bleaching process comprising the steps of:
- (a) treating a fiber, fabric or garment with a permanganate bleaching agent;
- and
- (b) reducing the permanganate with a reducing composition containing sulfur dioxide and ammonia at a weight percent ratio in the range of about 1.80:1 to about 3.80:1.
A bleaching process comprising the steps of:
- (a) treating a fiber, fabric or garment with a permanganate bleaching agent;
- and
- (b) reducing the permanganate with a reducing composition containing sulfur dioxide and ammonia at a weight percent ratio in the range of about 1.80:1 to about 3.80:1 and in the presence of an acid-buffer additive.
Dependencies are inferred from the claim text.