Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-12-23
2000-05-30
Liott, Caroline D.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510283, 510303, 510312, 510340, 510341, 510342, 510372, 510417, 510488, 510499, C11D 330, C11D 3395
Patent
active
060691239
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to stable peroxygen bleach-containing compositions suitable to be used as pretreater.
BACKGROUND
Peroxygen bleach-containing compositions have been extensively described in laundry applications as laundry detergents, laundry additives or even laundry pretreaters.
Indeed, it is known to use such liquid peroxygen bleach-containing compositions in laundry pretreatment applications to boost the removal of encrustated stains/soils which are otherwise particularly difficult to remove such as grease, coffee, tea, grass, mud/clay-containing soils and the like. However, a drawback associated with such liquid peroxygen bleach-containing compositions is the relative instability of said compositions. Indeed, such liquid peroxygen bleach-containing compositions when packaged in containers made out of deformable materials, typically thermoplastic materials, may cause so-called bulging problems. The peroxide bleach in the composition decomposes with time so as to generate oxygen in the composition. The released oxygen builds up pressure inside the container which eventually deforms, i.e., bulges. The rate of decomposition of peroxygen bleach depends on different parameters such as temperature, pH and/or presence of metal ions.
Known solutions to this problem are to use in such peroxygen bleach-containing compositions metal ions chelating agents, e.g., polyaminocarboxylates and/or phosphonate chelating agents, and/or radical scavengers which contribute to reduce peroxygen bleach decomposition and thus to stabilise said compositions.
Representative of the art is for example, EP-B- 209 228, which discloses the use of metal ions chelating agents such as amino polyphosphonates and radical scavengers such as hydroxybenzene compounds (butylated hydroxy toluene) to stabilise liquid hydrogen peroxide bleaching compositions.
However, such liquid peroxygen bleach-containing compositions are not totally satisfactory from a formulator point of view as said compositions all the same tend to be somewhat chemically unstable and consequently all the same tend to bulge the containers into which they may be packaged. In other words, it has been found that there is still room for further improving the chemical stability of a liquid peroxygen bleach-containing composition.
It is thus an object of the present invention to formulate liquid peroxygen bleach-containing compositions which exhibit improved chemical stability, especially upon prolonged periods of time.
It is further desirable when formulating peroxygen bleach-containing compositions suitable to be used as pretreater, that said compositions are safe to said fabric treated therewith. Indeed, it has been found that a drawback associated with such peroxygen bleach-containing compositions is that said compositions may damage fabrics, resulting in loss of tensile strength of the fabric fibres and/or color damage, when used in pretreatment application under stressed conditions, e.g., when applied directly onto the fabrics, and left to act onto said fabrics for prolonged periods of time, i. e., several hours, before washing said fabrics and/or when the fabrics to be pretreated are contaminated with metal ions such as copper and/or iron and/or manganese and/or chromium. Indeed, it is speculated that the presence of metal ions such as copper and/or iron and/or manganese and/or chromium on the surface of the fabrics, especially on cellulosic fibres, catalyses the radical decomposition of peroxygen bleaches like hydrogen peroxide. Thus, it is believed that a radical reaction occurs on the surface of the fabric with generation of free radicals, which results in tensile strength loss. Furthermore, it is speculated that this generation of free radicals may further provide an aggressive decomposition of certain dyes present in the fabrics resulting thereby in chemical damage of dye molecules which is visible as discoloration and/or hue change. Dyes commonly present in colored fabrics include metal containing dyes like copper-formazan dyes or metal-
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Masotti Valentina
Scialla Stefano
Cook C. Brant
Liott Caroline D.
Procter & Gamble Company
Rasser Jacobus C.
Zerby Kim W.
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