Bleaching and dyeing; fluid treatment and chemical modification – Using enzymes – dye process – composition – or product of dyeing
Patent
1993-09-09
1995-04-11
Prescott, Arthur C.
Bleaching and dyeing; fluid treatment and chemical modification
Using enzymes, dye process, composition, or product of dyeing
25217412, C09B 6700
Patent
active
054054141
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for removal of biological polymer or modified polymer and excess dye from printed textile by washing.
BACKGROUND ART
In printing of textiles, it is common to use a printing paste containing a dye and a thickener. Among the commonly used thickeners are biological polymers and chemically modified biological polymers, such as alginate, starch or modified starch, locust bean gum, galactomannan or modified galactomannan and carboxymethyl cellulose.
With most printing methods, the polymer and excess dye must be removed by washing with water after the fixation of the print. Generally, a large amount of water is required for complete removal due to the high viscosity and low water solubility of the printing paste. Insufficient removal leads to unsatisfactory quality of the finished textile for the following reasons: 1) dye may be transferred to other parts of the printed textile or to other garments during laundering by the consumer. 2) Residual thickener will make printed areas stiff. It is the object of this invention to decrease process time as well as the amount of energy and water needed to achieve a satisfactory quality of the textile and to increase the quality which can be obtained regarding colour fastness and "hand".
STATEMENT OF THE INVENTION
We have now found that the removal of the thickener and excess dye can be made much more efficient by treating the printed textile with a suitable enzyme at the beginning of the wash. The enzymatic breakdown of thickener will decrease process time as well as the amount of energy and water needed to achieve a satisfactory quality of the textile.
Although the need for better removal has been recognized for decades and many of the enzymes of the type used in the invention have long been available, an enzymatic process has so far never been suggested.
Accordingly, the invention provides a method for removal of excess dye and biological polymer or chemically modified polymer from printed textile by washing, characterized by comprising treatment of the textile with an aqueous solution containing an enzyme that hydrolyses said polymer.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the absorbance of the wash liquor after a first wash without enzyme addition.
FIG. 2 shows the absorbance of the wash liquor after a first wash with SP 496 added.
FIG. 3 shows the absorbance of the wash liquor after a first wash with SP 249 added.
FIG. 4 shows the absorbance of the wash liquor after a first, hot wash and the effect of a pH adjustment.
FIG. 5 shows the absorbance of the wash liquor after a first and a second hot wash with no additional enzyme.
FIG. 6 shows the absorbance of the wash liquor after a two hot washes using Aquazyme Ultra.
FIG. 7 (wash No. 1) and FIG. 8 (wash No. 2) show, with the absorbance readings, the effect of Aquazyme Ultra dosages on the first, hot wash liquors.
DETAILED DESCRIPTION OF THE INVENTION
Polymer (Thickener)
Some examples of commonly used thickeners that may be treated according to the invention are alginate, a modified alginate, starch, a modified starch, a modified cellulose, carrageenan, laminarin, a galactomannan, a modified galactomannan, guar gum or locust bean gum, particularly triethanolalginate, etherified starch, esterified starch, ethoxylated starch, carboxymethyl starch, oxidized starch, cross-linked starch, ethoxylated galactomannan, carboxymethyl galactomannan, carboxyethyl galactomannan, carboxymethyl cellulose or carboxyethyl cellulose. It is noted that laminarin (1,3-.beta.-D-glucan) may be present in commercial alginate products. In some circumstances thickeners are mixed e.g. alginate may be used together with starch, starch derivatives or carboxymethyl cellulose.
Textile
The process of the invention is applicable to all types of textile materials, both natural fibers (NF) and man-made fibers (MMF) as well as any combination hereof. Typical examples are cellulosic fibers (e.g. cotton and flax), cellulose fibers (e.g. acetate and triacetate), protein fibers (e.g.
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patent: 4832864 (1989-05-01), Olson
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Udod et al., Chem. Abs., vol. 95, p. 330 (1981) (complete article att.).
Asferg Lars
Hagen Hans A.
Pedersen Gitte
Sorensen Ebbe
Lambiris Elias J.
Novo Nordisk A S
Prescott Arthur C.
Zelson Steve T.
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