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Enzymatic textile colour modification

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Title: Enzymatic textile colour modification.
Abstract: for a length of time and under conditions suitable to permit measurable brightening of the textile material. (iii) a hydrogen peroxide source, (ii) an ester substrate for said perhydrolase enzyme, and (i) a perhydrolase enzyme, A method for adjusting the colour tone of dyed cellulosic textile fibre material comprising contacting said textile material with an enzymatic textile treatment composition comprising ...


Browse recent Huntsman International LLC patents - The Woodlands, TX, US
Inventors: Lode Vermeersch, Erwin Redling, Wayne Ashton, Christopher C. Barnett, Andreas Jacobus Johanna krouwer, Piera Pericu, Rafael F. Sala
USPTO Applicaton #: #20120088291 - Class: 435263 (USPTO) - 04/12/12 - Class 435 
Chemistry: Molecular Biology And Microbiology > Process Of Utilizing An Enzyme Or Micro-organism To Destroy Hazardous Or Toxic Waste, Liberate, Separate, Or Purify A Preexisting Compound Or Composition Therefore; Cleaning Objects Or Textiles >Textile Treating

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The Patent Description & Claims data below is from USPTO Patent Application 20120088291, Enzymatic textile colour modification.

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The present invention relates to methods for the enzymatic colour modification of dyed cellulosic textile fibre material, in particular denim dyed with indigo or sulphide dyes.

Some textile materials are washed after dyeing with the objective of adjusting the colour tone or shade on the dyed textile, also known as washdown effect. For instance, blue jeans made from indigo-dyed denim can be washed in the presence of pumice stones and enzymatic desizing agents, followed by an on tone-washdown process to obtain a desired worn appearance.

Conventional washdown processes comprise treatment of the coloured denim with sodium hypochlorite, what is unwanted in view of the appearance of fibre damages and because of ecological reasons.

Washdown with hydrogen peroxide is an alternative solution. The adjusting effect obtainable with hydrogen peroxide, however, is rather limited. Furthermore, the required high pH is ecologically undesirable.

An enzymatic washdown process which does not show the above indicated disadvantages would be desirable.

There is a need for an effective enzymatic washdown process for coloured cotton textiles which provides the desired wash-out effect under mild conditions and minimizes the adverse environmental impact, when compared to conventional textile colour modification processes.

The present invention accordingly relates to a method for adjusting the colour tone of dyed cellulosic textile fibre material comprising contacting said textile material with an enzymatic textile treatment composition comprising

(i) a perhydrolase enzyme, (ii) an ester substrate for said perhydrolase enzyme, and (iii) a hydrogen peroxide source.

The enzymatic treatment step of the present invention will employ, unless otherwise indicated, conventional techniques of molecular biology (including recombinant techniques), microbiology, cell biology, and biochemistry, which are within the skill of the art. Such techniques are explained fully in the literature, for example, Molecular Cloning: A Laboratory Manual, 2nd ed., (Sambrook et al., 1989); Oligonucleotide Synthesis (M. J. Gait, ed., 1984); Current Protocols in Molecular Biology (F. M. Ausubel et al, eds., 1994); PCR: The Polymerase Chain Reaction (Mullis et al., eds., 1994); and Gene Transfer and Expression: A Laboratory Manual (Kriegler, 1990).

Unless defined otherwise herein, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

Singleton, et al., Dictionary of Microbiology and Molecular Biology, 2nd ed., John Wiley and Sons, New York (1994), and Hale & Markham, The Harper Collins Dictionary of Biology, Harper Perennial, New York (1991) provide one of skill in the art with a general dictionary of many of the biotechnology related terms used in this invention. Any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.

Numeric ranges provided herein are inclusive of the numbers defining the range. Unless otherwise indicated, nucleic acids are written left to right in 5′ to 3′ orientation; amino acid sequences are written left to right in amino to carboxy orientation, respectively.

The term “adjusting” as used herein, means the process of treating a textile material for a sufficient length of time and under appropriate pH and temperature conditions to produce a lighter colour in said textile material by removal, modification or masking of color-causing compounds in the textile material. Thus, “adjusting” refers to the treatment of a textile material to effect a brightening of the textile material.

The term “cellulosic textile fibre material” comprises natural cellulosic fibres such as cotton, linen and hemp, semi-synthetic cellulosic fibres such as viscose and lyocell as well as blends of cellulosic fibres and synthetic fibres such as elastane.

The method according to the invention is particularly suitable for the treatment of denim dyed with vat dyes, reactive dyes, direct dyes and sulphur dyes, most preferably for indigo-dyed denim.

Suitable substrates that can be treated with the method according to the invention are yarns, wovens, knits and garments.

The method according to the invention provides textile material distinguishing by soft handle and very good crease recovery properties.

A “perhydrolase” refers to an enzyme that is capable of catalyzing a perhydrolysis reaction that results in the production of a sufficiently high amount of peracid suitable for use in an enzymatic textile adjusting composition according to the method described herein. Generally, a perhydrolase enzyme used in the methods described herein exhibits a high perhydrolysis to hydrolysis ratio. In some embodiments, the perhydrolase comprises, consists of, or consists essentially of the Mycobacterium smegmatis perhydrolase amino acid sequence set forth in SEQ ID NO:1, or a variant or homolog thereof. In some embodiments, the perhydrolase enzyme comprises acyl transferase activity and catalyzes an aqueous acyl transfer reaction.

A “peracid” is an organic acid of the formula RC(═O)OOH, wherein R is an aliphatic, aromatic or araliphatic radical.

An “ester substrate” in reference to an enzymatic textile adjusting composition according to the invention described herein refers to a perhydrolase substrate that contains an ester linkage. Esters comprising aliphatic and/or aromatic carboxylic acids and alcohols may be utilized as substrates with perhydrolase enzymes. In some embodiments, the ester source is selected from the esters of one or more of the following acids: formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, nonanoic acid, decanoic acid, dodecanoic acid, myristic acid, palmitic acid, stearic acid, and oleic acid. In some embodiments, the ester source is an acetate ester. In some embodiments, the ester source is selected from one or more of propylene glycol diacetate, ethylene glycol diacetate, glycerol triacetate, ethyl acetate, and glycerol tributyrate.

The term “perhydrolyzation” or “perhydrolyze” or “perhydrolysis” as used herein refer to a reaction wherein a peracid is generated from an ester substrate and a hydrogen peroxide source. The perhydrolyzation reaction is catalyzed with a perhydrolase, e.g., acyl transferase or aryl esterase, enzyme. In some embodiments, a peracid is produced by perhydrolysis of an ester substrate of the formula RC(═O)OR*, where R and R* are the same or different organic moieties, in the presence of hydrogen peroxide (H2O2). In one embodiment, —OR* is —OH. In one embodiment, —OR* is replaced by —NH2. In some embodiments, a peracid is produced by perhydrolysis of a carboxylic acid or amide substrate.

The term “peracid,” as used herein, refers to a molecule derived from a carboxylic acid ester which has been reacted with hydrogen peroxide to form a highly reactive product that is able to transfer one of its oxygen atoms. It is this ability to transfer oxygen atoms that enables a peracid, for example, peracetic acid, to function as a brightening agent.

The phrase “perhydrolysis to hydrolysis ratio” refers to the ratio of the amount of enzymatically produced peracid to the amount of enzymatically produced acid by a perhydrolase enzyme from an ester substrate under defined conditions and within a defined time. In some embodiments, the assays provided in WO 05/056782 are used to determine the amounts of peracid and acid produced by the enzyme.



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stats Patent Info
Application #
US 20120088291 A1
Publish Date
04/12/2012
Document #
File Date
04/19/2014
USPTO Class
Other USPTO Classes
International Class
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Perhydrolase


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