Sequential oxidative and reductive bleaching of pigmented and un

Details Sequential oxidative and reductive bleaching of pigmented and un Sequential oxidative and reductive bleaching of pigmented and un

1990-07-13

1992-01-28

Willis, Prince E.

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Chemical

81081, 8110, D06L 302

Patent

active

050840665

ABSTRACT:
The present invention is drawn to new processes for sequential oxidative and reductive bleaching of pigmented and unpigmented fibers (e.g. natural, synthetic, or blends thereof) e.g. in a single bath, which provide superior bleaching with less physical damage. Said processes including processes comprised of: (1) adsorption of ferrous ions by pigmented and unpigmented fibers; (2) removing a portion of the ferrous ions from the fibers, with at least a portion of the ions remaining on the pigmented fibers; (3) contacting the fibers with hydrogen peroxide to provide oxidative bleaching including bleaching by interaction with the ferrous ions; (4) 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; (5) reductively bleaching the already oxidatively bleached fibers. The aforementioned processes provide the advantages of preventing deposition of ferric species and producing fibers which are essentially free of iron residue. The present invention also encompasses processes employing hydrogen peroxide and at least one persulfate containing compound, rather than the aforementioned iron-mordanting. The instant invention produces fibers having surprising, highly advantageous, and desirable properties, e.g. fibers which are essentially pigment free, have a high degree of whiteness with low degree of damage.

REFERENCES:
patent: 4675076 (1987-06-01), Darlington
Fleet, M. R., Pigmented Fibres in White Wool, Wool Technology and Sheep Bding 33, 5-13, 1985.
Fleet, M. R. et al., Contamination of White Wool by Melanin-Pigmented Fibres When Pigmented and White Sheep Graze Together, Aust. J. Exp. Agric. 26, 159-163, 1986.
Foulds, R. A. et al., Dark Fibres and Their Economic Importance, Wool Technology and Sheep Breeding 32(2), 91-100, 1984.
Nolan C. and Foulds, R., Dard-Fibre Contamination in Wool, Queensland Agricultural J., Nov.-Dec., 305-307, 1985.
Turner, T. R. and Foulds, R. A., Decision Schemes for Assessing Dark Fiber Concentration in Top, Textile Res. J. 57(12), 710-720 (1987).
Wolfram, L. J. and Albrecht, L., Chemical and Photo-Bleaching of Brown and Red Hair, J. Soc. Cosmet Chem. 82, 179-191, 1987.
Wolfram, L. J. et al., The Mechanism of Hair Bleaching, J. Soc. Cosmet. Chem. 21, 875-900, 1970.
Zahn, H. et al., Bleaching and Permanent Waving Aspects of Hair Research, J. Soc. Cosmet. Chem. 37, 159-175, 1986.
Bereck, A., Bleaching of Dark Fibres in Wool, Proc. 7th Int. Wool Res. Conf., Tokyo, vol. IV, 152-162, 1985.
Bereck, A. and Kaplin, J. J.; Electron-Microscope Observations on the Disintegration of Melanin Granules in Chemically Treated Karakul Wool, J. Textile Inst. 74, 44-47, 1983.
Bereck, A. et al., Das Selective Bleichen von Pigmentierten Haaren in Rohweisser Wolle, Textil Praxis Int. 37, 621-629, 1982.
Finnimore, E. and Bereck, A., Verhalten von Selectiv Gebleichter Wolle, Melliand Textiberichte 68, 669-672 (English translation, E291-292), 1987.
Kriel, W. J., Melanin-Bleeding of Pigmented Wool, SAWTRI (South African Wool Textile Research Inst.) Bulletin 3(1), 16-20, 1969.
Laxer, G. and Whewell, C. S., Some Physical and Chemical Properties of Pigmented Animal Fibres, Proc. Int. Wool Res. Conf. Aust. vol. F, 186-200, 1955.
Teasdale, D. C. and Bereck, A., The Measurement of the Color of Bleached and Natural Karakul Wool, Textile Res. J. 51, 541-549, 1981.
Van Heerden, N. et al., Bleaching of Karakul Wool, SAWTRI (South African Wool Textile Research Inst.) Bulletin 3(4), 21-23, 1969.
Corbett, J. F., The Chemistry of Hair-Care Products, J. Soc. Dyers Colour. 92, 285-303, 1976.
Geison and Ziegler, Die Absorption von Eisen durch Wolle und Haar, Melliand Textilberichte, 62, 482-483 (English Translation, E622-625), 1981.
Textile Terms and Definitions, 5th ed., publ. Textile Institute, Aug. 1963.
W. C. Schumb et al., editors, Hydrogen Peroxide, chpt. 8, publ. Reinhold Pub. Corp., NY, 1955.
I.W.T.O. Technical Committee Report, 1960, IWTO-4-60(E).
Ziegler, K., Textil-Praxis, 17, 376(1962).

Affiliated with

Also associated with

Rating

Sequential oxidative and reductive bleaching of pigmented and un does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sequential oxidative and reductive bleaching of pigmented and un, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sequential oxidative and reductive bleaching of pigmented and un will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1858229