Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
2000-03-09
2002-09-03
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S382000, C510S444000
Reexamination Certificate
active
06444634
ABSTRACT:
TECHNICAL FIELD
The present invention relates to bleach-containing compositions, suitable for use in laundry washing methods.
BACKGROUND TO THE INVENTION
In the past decades research efforts have been directed towards the development of bleaching systems, based on organic peroxyacids, which can provide effective stain and/or soil removal from fabrics at lower wash temperatures. The organic peroxyacids are often obtained by the in situ perhydrolysis of organic peroxyacid bleach precursor compounds (bleach activators).
A commonly employed precursor compound is tetraacetyl ethylene diamine (TAED) which provides effective hydrophilic cleaning especially on beverage stains. To achieve effective bleaching of a detergent, both hydrophobic and hydrophilic stains need to be bleached by the bleach system. Further organic peroxyacid precursors have thus been developed to deal with hydrophobic stains and soils.
Various documents disclose the use of mixtures of hydrophobic and hydrophilic bleaches in detergents, for example JP 7-238298 DE 196,16, 782, WO94/28103.
However, the inventors have found that most prior art bleaching compositions do not always perform satisfactory when used under stressed conditions, such as low temperature washing, washing with limited agitation, use of low quantities of detergent actives, highly soiled fabrics, presence of high levels of metal ions, or after storage under humid or high temperature. These problems occur in particular in low density detergents, in particular when the overall level of the bleach system in the detergent composition is low, and also in detergents which contain high levels of phosphate-builder, which may introduce metal ions to the wash.
Furthermore, to achieve an efficient bleach system, the system should provide excellent bleaching at low levels, thereby minimizing the chance of damage to the fabrics.
Thus, there is a need to provide detergent compositions which comprise low levels of a bleaching system, which has a very effective bleaching performance under stressed conditions, on both hydrophobic soils and hydrophilic soils.
The inventors have now surprisingly found that improved bleaching under stressed conditions can be achieved by use of a bleaching-composition containing a low level of bleach activators and peroxide source, namely having an available oxygen (AvO) derived from hydrophobic and hydrophilic bleach activators of less than 5000 ppm, and having a specific ratio of AvO of the hydrophobic activator to the AvO of the hydrophilic activator, namely from 3:1 to 1:50, and a specific ratio of the total AvO to the AvO of the activators, namely more than 2:1. The bleach system has been found to be particularly useful in low density detergents, in hand washing detergents, in phosphate-containing compositions, and also in washing processes where a low concentration of detergent is used.
In general, bleach and in particular hypochlorite bleach is known to kill bacteria. High levels of bleach are normally required to provide a sufficient reduction of the bacteria's or to eliminate the bacteria's. Therefore, most detergents which comprise bleach systems known in the art, which only comprise low levels of bleach, are not effective as biocide agents for sanitization.
The inventors have found that mixed bleach systems, comprising specific levels and ratios of hydrophobic, hydrophilic bleach additives and peroxide sources are very useful as biocide agents.
They have found that even the use of low levels of specific bleach compositions in wash solutions or in detergents or cleaning agents, provides effective sanitization of the washed fabrics or surfaces, or effective reduction of the bacterias when the bleaching components are used in the specific ratios, mentioned herein.
All documents cited in the present description are, in relevant part, incorporated herein by reference.
SUMMARY OF THE INVENTION
The present invention relates to a detergent composition, having a density from 330 g/liter to 700 g/liter, comprising a bleaching system containing a hydrophilic and a hydrophobic peracid bleach or peracid bleach presursor and a peroxide source, characterized in that the total level of Available Oxygen from the hydrophilic and hydrophobic peracid bleach or bleach precursors (AvO-a) is less than 5000 ppm, the ratio of Available Oxygen of the hydrophobic peracid or precursor (AvO-hb) to the Available Oxygen of the hydrophilic peracid or precursor (AvO-hp) is from 3:1 to 1:50 and the ratio of the Available Oxygen of the peroxide source (AvO-o) to the AvO-a is at least 2:1.
DETAILED DESCRIPTION OF THE INVENTION
In the detergent compositions of the invention, the total level of Available Oxygen from the hydrophilic and hydrophobic peracid bleach or bleach precursors (AvO-a) is less than 5000 ppm, or even less than 4000 ppm or even less than 3000 ppm or even less than 2500 ppm.
The ratio of Available Oxygen of the hydrophobic peracid or precursor (AvO-hb) to the Available Oxygen of the hydrophilic peracid or precursor (AvO-hp) is from 3:1 to 1:50, more preferably from 2.5:1 to 1:30, or even 2:1 to 1:20.
The ratio of the Available Oxygen of the peroxide source (AvO-o) to the AvO-a is at least 2:1, preferably at least 3:1 or even 4:1.
The compositions preferably have a density from 370 g/liter to 700 g/liter, or even to 650 g/liter or even to 600 g/liter.
It may be preferred that the composition is a low density granular composition, in particular phosphate-containing compositions and in particular high sudsing compositions, soaking or pre-treatment compositions, hand washing compositions.
Thus, the invention also relates to a method of washing laundry by hand or pre-treating or soaking of laundry, whereby a detergent composition according to the invention.
The invention also relates to the use of bleaching compositions, comprising hydrophobic and hydrophilic peracid bleach or precursors thereto, and a peroxide source for reduction of the activity of bacteria, whereby the ratio of AvO-hb to AvO-hp is from 3:1 to 1:50, preferably 2.5:1 to 1:10 as even 2:1 to 1:20 and whereby the ratio of AvO-o to AvO-a is at least 2:1, preferably at least 3:1 or even 4:1.
When used herein, “reduction of the activity of bacteria” includes killing of the bacteria or part thereof and inhibition of further growth or development of bacteria.
Preferably the bleaching compositions are used for sanitisation of the fabrics or surfaces, cleaning with the bleaching compositions. Then, it is preferred that the sanitization method involves contacting the fabrics or surfaces containing bacteria's, in particularly present in stain on the fabrics or surfaces, with the compositions. Thus, the invention also encompasses a method for sanitisation of fabrics whereby the fabrics are contacted with a composition or a solution of a composition, comprising a hydrophilic and hydrophobic peracid bleach or precursors thereto and a peroxide source, characterized in that the ratio of Available Oxygen of the hydrophobic peracid or precursor (AvO-hb) to the Available Oxygen of the hydrophilic peracid or precursor (AvO-hp) is from 3:1 to 1:50 and the ratio of the Available Oxygen of the peroxide source (AvO-0) to the total level of Available Oxygen from the hydrophilic and hydrophobic peracid bleach (AvO-a) is at least 2:1.
The bleaching compositions are preferably present in cleaning compositions for cleaning fabrics or surfaces, preferably laundry or dishwashing detergents or hard-surface cleaners. Preferred are laundry detergent compositions for comprising the ingredients described herein.
Preferably the level of AvO-a in the cleaning compositions or detergent composition, or solutions thereof, which contain the bleaching composition and which are for use of reducing the activity of bacteria, is up to 10,000 ppm, more preferably, up to 5,000 ppm or even 4,000 ppm or even 3,000 ppm or 2,500 ppm.
Preferred hydrophilic and hydrophobic peracid bleaches or precursors thereto and preferred peroxide sources are described hereinafter.
Hydrophobic and Hydrophilic Peracids or Peracid Pre
Brown Donald Ray
Grippay Ludivine Pascale
Guedira Nour-Eddine
Mason Susan Judith
Mellea Michelle Frances
Dressman Marianne
Glazer Julia A.
Gupta Yogendra N.
Petruncio John M
William Zerby Kim
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