Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Patent
1998-11-04
2000-10-17
Warden, Jill
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
510276, 510281, 510367, 510370, 510461, 510470, 8101, 2521881, C11D 1402, C11D 300, D06L 300, B01D 1900, C02F 170
Patent
active
061332194
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to reductive bleaching formulations containing glucose, nonionic surfactants and buffer salts, to a process for the alkaline bleaching of dyed cotton fabrics and to the use of the formulations as reductive bleaching agents.
2. Discussion of Related Art
The annual world production of jeans amounts to several million pairs. A large part of this total is subjected to an artificial ageing process in which the jeans are treated together with stones in a wash liquor so that they assume a "worn" appearance, but at the same time are made softer and hence more comfortable to wear. In addition, the statistical washing out of color associated with the worn appearance is often desired by the consumer ("stonewash effect"). Another consumer demand is similarly directed, i.e. to bleach the fabric and to give it a used appearance. To this end, the fabric is generally treated with alkaline hypochlorite liquors or hydrogen peroxide. Although the bleaching agents mentioned are extremely effective to use, they also have serious disadvantages. Thus, the use of hypochlorites leads to very considerable AOX pollution of the wastewater while the use of hydrogen peroxide, particularly in the form of concentrated solutions, is only possible with considerable outlay on anti-explosion measures. In addition, both hypochlorite and hydrogen peroxide not only bleach the fabric, they also cause non-selective damage so that, in the course of bleaching, 10-15 pairs of blue jeans out of 100 generally have to be rejected.
DE-A1 4306827 (Rotta) describes a process for bleaching textiles, preferably denim, treated with vat dyes in which glucose in the form of an alkaline solution is used as reducing agent. Although the reject rate can thus be distinctly reduced in relation to the treatment with hypochlorite, the result obtained is still not entirely satisfactory. In addition, the lightening in color and, in particular, the softness of the fabrics are unsatisfactory.
Accordingly, the problem addressed by the present invention was to provide bleaching agents which would not have any of the disadvantages mentioned above.
DESCRIPTION OF THE INVENTION
The present invention relates to reductive bleaching agents for the alkaline treatment of dyed cotton fabric containing buffer salts,
It has surprisingly been found that the formulations according to the invention not only are ecotoxicologically safe, they readily bleach dyed cotton fabric under alkaline conditions without causing any corrosion problems in the equipment used and without affecting fiber quality. The reject rate of the treated textiles is below 2%. Textiles with excellent color lightening and a very good soft feel are obtained.
The present invention also relates to a process for the reductive bleaching of dyed cotton fabric in which the fabric is treated at pH 13 to 14 with a formulation containing buffer salts,
Typical examples of nonionic surfactants which may be used as component (b) in accordance with the invention are fatty alcohol polyglycol ethers, alkylphenol polyglycol ethers, fatty acid polyglycol esters, fatty acid amide polyglycol ethers, fatty amine polyglycol ethers, alkoxylated triglycerides, mixed ethers and mixed formals, alk(en)yl oligoglycosides, fatty acid-N-alkyl polyhydroxyalkyl amides, protein hydrolyzates (particularly wheat-based vegetable products), polyol fatty acid esters, sugar esters, sorbitan esters, polysorbates and amine oxides. If the nonionic surfactants contain polyglycol ether chains, they may have a conventional homolog distribution, although they preferably have a narrow homolog distribution. The surfactants mentioned are all known compounds. Information on their structure and production can be found in relevant synoptic works, cf. for example J. Falbe (ed)., "Surfactants in Consumer Products", Springer Verlag, Berlin, 1987, pages 54-124 and J. Falbe (ed.), "Katalysatoren, Tenside und Mineralol-additive", Thieme Verlag, Stuttgart, 1978, pages 123-217. It is particularly
REFERENCES:
patent: 1985424 (1934-12-01), Piggott
patent: 2016962 (1935-10-01), Flint et al.
patent: 2703798 (1955-03-01), Schwartz
patent: 5366510 (1994-11-01), Wasinger et al.
patent: 5374716 (1994-12-01), Biermann et al.
patent: 5549715 (1996-08-01), Olip
patent: 5576425 (1996-11-01), Hill et al.
J. Falbe (ed.), "Surfactants in Consumer Products," Springer Verlag, Berlin (1987), pp. 54-124.
E. Hoshino, et al., J. Biochem. (1994) 114, pp. 230-235.
E. Hoshino, et al., J. Biochem. (1994) 115, pp. 837-842.
E. Hoshino, et al., Journal of Fermentation and Bioengineering (1994) 77, No. 5, pp. 496-502.
Chemical Abstract 98:145006q (1983).
Brau Balague Emili
Copete Vidal Terese
Cole Monique T.
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
Trzaska Steven J.
Warden Jill
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