Sequential oxidative/reductive bleaching and dyeing in a multi-c

Details Sequential oxidative/reductive bleaching and dyeing in a multi-c Sequential oxidative/reductive bleaching and dyeing in a multi-c

1991-05-09

1993-11-23

McFarlane, Anthony

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Chemical

8110, 81281, D06L 302, D06L 300, D06M 1100, D06M 13322

Patent

active

052640019

ABSTRACT:
The present invention is drawn to new processes for sequential oxidative and reductive bleaching and dyeing of fibers (e.g. natural, synthetic, or blends thereof) e.g. in a single bath, which provide superior bleaching with less physical damage and therefore improved dyeing. 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; (3) reductively bleaching the already oxidatively bleached fibers; (4) adding an oxidizing material in an amount at least sufficient to oxide excess reductive bleaching agent; and (5) dyeing of the bleached fibers. Also encompassed by the present invention are novel bleached and dyed fibers produced by the aforementioned processes, having highly advantageous and desirable properties.

REFERENCES:
patent: 2914374 (1959-11-01), Harris et al.
patent: 4961752 (1990-10-01), Arifoglu et al.
patent: 5103522 (1992-04-01), Arifoglu et al.
Bereck et al., Textil Praxis International, vol. 37, No. 6, Jun. 1982, pp. 621-629.
Arifoglu et al., Textile Research Journal, vol. 60, No. 6, Jun. 1990, pp. 319-328.
"New Lecture on Dyeing Processing, No. 5-Purification and Bleaching" edited by Shozo Asahara, published by Kyoritsu Shuppan K.K. on May 15, 1972, pp. 12-15.

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