Bleaching and dyeing; fluid treatment and chemical modification – Bleaching – Chemical
Patent
1990-07-13
1992-04-14
Willis, Prince E.
Bleaching and dyeing; fluid treatment and chemical modification
Bleaching
Chemical
8110, 81081, D06L 302
Patent
active
051035227
ABSTRACT:
The present invention is drawn to new processes for sequential oxidative and reductive bleaching of fibers (e.g. natural, synthetic, or blends thereof) e.g. in a single bath, which provide superior bleaching with less physical damage. Said processes comprising the steps of: (1) bleaching fibers with hydrogen peroxide; (2) adding either, (a) a material which combines with hydrogen peroxide to form a reductive bleaching agent, or (b) an inactivating material to inactivate unspent hydrogen peroxide with subsequent addition of a reductive bleaching agent, and; (3) reductively bleaching the already oxidatively bleached fibers. Also encompassed by the present invention are novel bleached fibers produced by the aformentioned processes, having highly advantageous and desirable properties e.g. a high degree of whiteness with low degree of damage.
REFERENCES:
patent: 4675076 (1987-06-01), Darlington
Textile Terms and Definitions, 5th Ed., Textile Institute, p. 9, Aug. 1963.
W. C. Schumb et al editors, Hydrogen Peroxide, Reinhold Pub. Corp, New York, pp. 447-514, 1955.
I.W.T.O. Technical Committee Report, Venice, May 1960.
Arifoglu Mustafa
Marmer William N.
McNally John F.
Sadowski David R.
Silverstein M. Howard
The United States of America as represented by the Secretary of
Willis Prince E.
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