Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-06-04
1999-10-12
Kopec, Mark
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510302, 510303, 510304, 510310, 510312, 510313, 510336, 510337, 510338, 510349, 510361, 510371, 510372, 510376, 510378, C11D 320, C11D 326, C11D 339, C11D 3395
Patent
active
059655054
DESCRIPTION:
BRIEF SUMMARY
This invention relates to detergent compositions containing a heavy metal ion sequestrant and an organic peroxyacid bleaching system wherein a means is provided for delaying the release to the wash solution of the organic peroxyacid bleach relative to the release of the heavy metal ion sequestrant.
The satisfactory removal of bleachable soils/stains such as tea, fruit juice and coloured vegetable soils from soiled/stained substrates is a particular challenge to the formulator of a detergent composition for use in a washing method such as a laundry or machine dishwashing method.
Traditionally, the removal of such bleachable soils/stains has been enabled by the use of bleach components such as oxygen bleaches, including hydrogen peroxide and organic peroxyacids. The organic peroxyacids are often obtained by the in situ perhydrolysis reaction between hydrogen peroxide and an organic peroxyacid bleach precursor.
A problem encountered with the use of certain organic peroxyacid bleaches in laundry washing methods is a tendency for these organic peroxyacid bleaches to affect the colour stability of the fabrics in the wash. Types of fabric damage can include fading of coloured dyes on the fabrics or localised areas of "patchy" colour bleaching.
The detergent formulator thus faces the dual challenge of formulating a product which maximises bleachable soil/stain removal but minimises the occurrence of any unwelcome fabric colour stability effects of the bleach.
The Applicants have found that the occurrence of any unwelcome fabric colour stability effects arising from the use of organic peroxyacid bleaches in a washing method can be related to the rate of release of the peroxyacid bleach to the wash solution and also to the absolute level of peroxyacid present in the wash solution.
A fast rate of release of the peroxyacid bleach to the wash solution tends to heighten the probability that unwelcome fabric colour stability effects will be observed, as does a high absolute level of the bleach in the wash solution.
Whilst reducing either the rate of release of the peroxyacid bleach, or the absolute level of the bleach employed in the wash tends to ameliorate this problem, this can be accompanied by a negative effect on the bleachable stain/soil removal ability.
The Applicants have now however found that where a composition containing both a heavy metal ion sequestrant and a peroxyacid bleach source is employed, and wherein a means is provided for delaying the release to a wash solution of the peroxyacid bleach relative to the release of the heavy metal ion sequestrant enhanced bleachable stain/soil removal may be obtained. Additionally, where the composition is used in a laundry washing method a reduction in the propensity for negative fabric colour stability effects to be observed is also obtained.
The Applicants have in addition found that bleachable stain/soil removal benefits may be obtained when a soiled substrate is pretreated with a solution containing a heavy metal ion sequestrant, and optionally a water soluble builder, prior to being washed in a method using a bleach containing detergent product.
It is therefore an object of the present invention to provide compositions suitable for use in laundry and machine dishwashing methods having enhanced bleachable stain removal.
It is also an object of the present invention to provide compositions for use in a laundry washing method wherein said compositions show less propensity to cause negative fabric colour stability effects.
It is a related object of the present invention to provide a stain/soil pretreatment method involving pretreating the soiled substrate with a solution containing a heavy metal ion sequestrant and optionally a water soluble builder, prior to washing with a bleach-containing detergent product.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a detergent composition containing said organic peroxyacid relative to the release of said heavy metal ion sequestrant such that in the T50 test method herein desc
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Baillely Gerard Marcel
Jeffrey Janice
Park John Scott
Stoddart Barry
Delcotto Gregory R.
Khosla Pankaj M.
Kopec Mark
Patel Ken K.
Rasser J. C.
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