Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1995-10-10
1997-09-23
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510220, 510374, 510375, 510376, 510508, 510514, C11D 754
Patent
active
056704682
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a dishwashing composition and method for inhibiting the redeposition of coloured food soils from the wash solution onto articles in the wash.
BACKGROUND OF THE INVENTION
A well recognized problem arising during modern fabric laundering operations is the tendency of some coloured fabrics to release dye into the laundering solution. The dye is then transferred onto other fabrics being washed therewith.
In dishwashing methods, especially machine dishwashing methods, there exists a related problem, which is however, not recognized in the art. Coloured food soils, comprising natural dyestuffs, may be removed from the articles being washed and then redeposit from the wash solution onto other articles in the wash or onto the interior of the vessel holding the wash solution such as a dishwashing machine.
The problem is particularly noticeable when the washload includes articles soiled by foods naturally containing significant levels of coloured dyestuff molecules, including for example tomato sauce, fruit juices such as blackcurrant juice, and curry.
The Applicants have found that plastic articles in the wash, and areas of the interior of a dishwashing machine, which are made of plastic, are particularly susceptible to the deposition of coloured food dyes from the wash liquor.
A solution to the problem of dye transfer in laundering operations is to bleach the fugitive dyes washed out of dyed fabrics before they have the opportunity to become attached to other articles in the wash.
Suspended or solubilized dyes can to some degree be oxidized in solution by employing known bleaching agents. GB 2 101 167 describes a stable liquid bleaching composition containing a hydrogen peroxide precursor which is activated to yield hydrogen peroxide on dilution.
U.S. Pat. No. 4,077,768 describes a process for inhibiting dye transfer by the use of an oxidizing bleaching agent together with a catalytic compound such as iron porphins. The effectiveness of this process however tends to be limited, particularly in the way that the oxidsing bleaching agent has to be added dropwise in order to obtain the most effective dye transfer inhibition.
Copending EP Patent Application 91202655.6 filed Oct. 9, 1991, provides an efficient dye transfer inhibiting composition which overcomes this limitation of the process of U.S. Pat. No. 4,077,768 and provides a practical way of controlling a low steady state level of hydrogen peroxide.
The aforementioned copending EP Patent Application relates to dye transfer inhibiting compositions comprising an enzymatic system capable of generating hydrogen peroxide and metallo catalysts, especially for use in laundering operations.
The hydrogen peroxide is enzymatically generated in situ by using a hydrogen peroxide precursor plus an oxidase enzyme eg: glucose or alcohol as hydrogen peroxide precursors and respectively glucose oxidase or alcohol oxidase as the enzyme system.
Two other copending EP Patent Applications, 92870019.4 and 9270017.8 provide improved dye transfer inhibiting compositions which also comprise an enzymatic system capable of generating hydrogen peroxide and metallo catalysts, especially for use in laundering operations.
The Applicants have now recognized that certain of the solutions proposed to mitigate dye transfer in laundering operations may also be applied to solve the problem of coloured food dyestuff deposition in a dishwashing method.
The present invention therefore provides a method for dishwashing operations, especially machine dishwashing operations, which mitigates the problem of coloured food dyestuff deposition.
SUMMARY OF THE INVENTION
The present invention relates to a dishwashing method wherein the articles to be washed are treated with an effective amount of a detergent composition comprising:
A. a metallo catalyst selected from thereof; thereof derivatives thereof; and
B. an enzymatic system capable of generating hydrogen peroxide
In another aspect of the invention said detergent composition further comprises
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Dvsheck Caroline L.
Lieberman Paul
Rasser J. C.
Reed T. David
The Procter & Gamble & Company
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