Compositions – Oxidative bleachant – oxidant containing – or generative – Contains activator admixed with inorganic peroxide
Patent
1996-10-15
1998-05-26
Lusignan, Michael
Compositions
Oxidative bleachant, oxidant containing, or generative
Contains activator admixed with inorganic peroxide
510312, 510367, C09K 300
Patent
active
057559929
DESCRIPTION:
BRIEF SUMMARY
This invention relates to detergent compositions containing a surfactant and a source of peroxyacid bleach, wherein a means is provided for delaying the release to the wash solution of said peroxyacid bleach relative to the release of said surfactant.
The satisfactory removal of greasy, coloured soils/stains such as foodstuffs, cosmetics, leather polishes and body 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 this type of soils/stains has been enabled by the use of surface active ingredients and 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 being washed. Effects on fabric colour stability can include fading of coloured dyes on the fabrics or localised areas of "patchy" 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 nature of the organic peroxyacid, and also to both the rate of release of the peroxyacid bleach to the wash solution and 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 surfactant 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 surfactant enhanced bleachable stain/soil removal may be obtained.
Additionally, where the composition is used in a laundry washing method a reduction in fabric colour stability problems 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 surfactant, 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 surfactant, prior to washing with a bleach-containing detergent product.
SUMMARY OF THE INVENTION
According to the present invention there is provided a detergent composition containing said peroxyacid bleach relative to the release of said surfactant such that in the T50 test method herein described the time to achieve a concentration that is 50% of the ultimate concentration of said surfactant is less than 120 seconds and the time to achieve a concentration
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Baillely Gerard Marcel
Jeffrey Janice
Park John Scott
Lusignan Michael
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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