Bleaching process comprising use of a phenol oxidizing enzyme, a

Details Bleaching process comprising use of a phenol oxidizing enzyme, a Bleaching process comprising use of a phenol oxidizing enzyme, a

1997-04-25

1998-12-22

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Color stripping or subduing

8107, 8111, 510305, 510312, 510313, 435263, C11D 3386, D06P 302

Patent

active

058512330

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 35 U.S.C. 371 national application of PCT/DK95/00418 filed Oct. 18, 1995 and claims priority under 35 U.S.C. 119 of Danish application 1216/94 filed Oct. 20, 1994 and 803/95 filed Jul. 7, 1995, the contents of which are fully incorporated herein by reference.


FIELD OF INVENTION

The present invention relates to a process for providing a bleached look in the colour density of the surface of dyed fabric, especially cellulosic fabric such as denim.


BACKGROUND ART

The most usual method of providing a bleached stone-washed look in denim fabric or jeans is by washing the denim or jeans made from such fabric in the presence of pumice stones to provide the desired localized lightening of the colour of the fabric. This is then followed by a bleaching process where the fabric is treated with sodium hypochlorite at 60.degree. C. and pH 11-12 for up to 20 min., followed by a neutralisation step and a rinsing. Use of hypochlorite is undesirable, both because chlorite itself is undesirable and because the neutralisation subsequently generates high amounts of salts leading to disposal and pollution problems.
Bleaching enzymes such as peroxidases together with hydrogen peroxide or oxidases together with oxygen have also been suggested for bleaching of dyed textiles (see WO 92/18683), either alone or together with a phenol such as p-hydroxycinnamic acid, 2,4-dichlorophenol, p-hydroxybenzene sulphonate, vanillin or p-hydroxybenzoic acid. The disclosed process is not efficient as can be seen from Example 1 of the present invention.
Thus there is still a need for providing a bleached look in dyed fabrics. The problem to be solved is not easy as many VAT-dyes, especially indigo, are not soluble in water and have a very compact structure on the fibre surface, making them difficult for an enzyme to attack.


SUMMARY OF THE INVENTION

Surprisingly it has been found that it is possible to create a very efficient process for providing a bleached look in the colour density of the surface of dyed fabric, the process comprising contacting, in an aqueous medium, a dyed fabric with a phenol oxidizing enzyme system and an enhancing agent of the following formula: ##STR2## in which formula X represents (--O--) or (--S--), and the substituent groups R.sup.1 -R.sup.9, which may be identical or different, independently represents any of the following radicals: hydrogen, halogen, hydroxy, formyl, carboxy, and esters and salts hereof, carbamoyl, sulfo, and esters and salts hereof, sulfamoyl, nitro, amino, phenyl, C.sub.1 -C.sub.14 -alkyl, C.sub.1 -C.sub.5 -alkoxy, carbonyl-C.sub.1 -C.sub.5 -alkyl, aryl-C.sub.1 -C.sub.5 -alkyl; which carbamoyl, sulfamoyl, and amino groups may furthermore be unsubstituted or substituted once or twice with a substituent group R.sup.10 ; and which phenyl may furthermore be unsubstituted or substituted with one or more substituent groups R.sup.10 ; and which C.sub.1 -C.sub.14 -alkyl, C.sub.1 -C.sub.5 -alkoxy, carbonyl-C.sub.1 -C.sub.5 -alkyl, and aryl-C.sub.1 -C.sub.5 -alkyl groups may be saturated or unsaturated, branched or unbranched, and may furthermore be unsubstituted or substituted with one or more substituent groups R.sup.10 ; halogen, hydroxy, formyl, carboxy and esters and salts hereof, carbamoyl, sulfo and esters and salts hereof, sulfamoyl, nitro, amino, phenyl, aminoalkyl, piperidino, piperazinyl, pyrrolidin-1-yl, C.sub.1 -C.sub.5 -alkyl, C.sub.1 -C.sub.5 -alkoxy; which carbamoyl, sulfamoyl, and amino groups may furthermore be unsubstituted or substituted once or twice with hydroxy, C.sub.1 -C.sub.5 -alkyl, C.sub.1 -C.sub.5 -alkoxy; and which phenyl may furthermore be substituted with one or more of the following radicals: halogen, hydroxy, amino, formyl, carboxy and esters and salts hereof, carbamoyl, sulfo and esters and salts hereof, and sulfamoyl; and which C.sub.1 -C.sub.5 -alkyl, and C.sub.1 -C.sub.5 -alkoxy groups may furthermore be saturated or unsaturated, branched or unbranched, and may furthermore be substituted once or twic

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