Sequential oxidative and reductive bleaching in a multicomponent

Details Sequential oxidative and reductive bleaching in a multicomponent Sequential oxidative and reductive bleaching in a multicomponent

1989-01-19

1990-10-09

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Chemical

8110, D06L 302, D06L 304

Patent

active

049617524

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 perioxide 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 aforementioned processes, having highly advantageous and desirable properties e.g. a high degree of whiteness with low degree of damage.

REFERENCES:
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.
K. Ziegler, Wool Bleaching, Textil-Praxis, 17, 376-80(1962).
Annual Book of ASTM Standards, Am. Soc. for Testing and Materials, Philadelphia, 1981, ASTM, D-1682-64.
Attila Bereck, "Bleaching of Dark Fibres In Wool", Proceedings of the 7th International Wool Textiles Res. Conf., Tokyo, 1985, vol. IV.

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