Method for permanganate bleaching of fabric and garments

Details Method for permanganate bleaching of fabric and garments Method for permanganate bleaching of fabric and garments

1988-01-27

1989-01-03

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Chemical

25218821, 25218822, D06L 300, B01D 1900

Patent

active

047954760

ABSTRACT:
Permanganate based fabric bleaching processes, such as stone-washing processes, are substantially improved by utilizing a reducing composition comprising a metabisulfite and a sulfite in the washing step. The relative amounts of metabisulfite and sulfite in the reducing composition are selected so as to substantially eliminate the odor of sulfur dioxide during the washing step at the particular temperature selected. For washing temperatures of 100.degree.-140 .degree. F. the preferred weight ratio of sodium metabisulfite to sodium sulfite is 7:3, which produces a reducing composition having a pH of 6.2 (in a 5% by weight solution). Such a composition not only allows operation at elevated temperatures without an odor of SO.sub.2, it also allows a reduction in the washing time and in the amount of reducing composition used.

REFERENCES:
patent: 3472609 (1969-10-01), Panto et al.
patent: 4421664 (1983-12-01), Anderson et al.

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