Compositions – Oxidative bleachant – oxidant containing – or generative – Composition containing a stabilizer or a product in the form...
Patent
1997-01-17
1999-06-22
Medley, Margaret
Compositions
Oxidative bleachant, oxidant containing, or generative
Composition containing a stabilizer or a product in the form...
25218725, 25218726, 81081, 510370, 510373, 510380, 510477, C01B 1106
Patent
active
059140690
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a liquid bleaching composition Which is suitable for laundry applications and household applications. More specifically, the compositions herein can be used in laundry applications as pre-wash bleaching compositions.
BACKGROUND OF THE INVENTION
Liquid bleaching compositions are well known in the art. Amongst the different bleaching compositions available, those relying on bleaching by hypochlorite are often preferred, mainly for whiteness performance reasons. See, for example, WO-88-05461 which discloses an aqueous composition comprising hypochlorite, sodium carbonate and sodium hydroxide and the use of said composition for removing stains from the fabrics. However, the drawbacks associated with the use of chlorine-based compositions are that said compositions may both damage and yellow fabrics.
It is therefore an object of the present invention to provide a hypochlorite-containing composition, suitable for use in laundry, whereby the yellowing of the fabrics is reduced or eliminated.
It is a further object of the present invention to provide a hypochlorite-containing composition, suitable for use in laundry, whereby fabric safety is improved.
It is another object of the present invention to provide a hypochlorite-containing composition, suitable for use in laundry, whereby the hypochlorite stability is improved. We have now found that the presence of some metal ions such as Ni, Co, Cu, Mn, Pd, Pt, Cr, Hg, Ir, and Fe adversely affects both hypochlorite bleaching performance and stability. It is believed that in the Washing environment said metal ions catalyze the attack of hypochlorite on fabrics with the generation of yellow oxidized species. Said metal ions also lead to reduced tensile strength of the fabrics, thereby reducing fabrics resistance. It is further believed that said metal ions are adsorbed per se on oxidized fabrics as colored species and catalyze the degradation of the brighteners adsorbed on fabrics generating thereby highly colored species on fabrics. Also, said metal ions stabilize colored pigments of enzymatic stains such as blood or grass. Furthermore, it is believed that said metal ions are detrimental for the performance of a hypochlorite composition as they tend to react with the hypochlorite present in said composition and thereby catalyze the decomposition of said hypochlorite.
Therefore we have found that it is essential that levels of said metal ions are controlled both in said composition as is and in the bleaching environment, thereby providing improved whiteness performance and safety to fabric and improved hypochlorite stability.
It has now been found that this can be achieved by formulating hypochlorite bleach compositions comprising a specific complexing agent or mixtures thereof selected from the group of polycarboxylic acid derivatives of pyridine or salts thereof. Said complexing agents are believed to be highly selective in binding the metal ions which are detrimental for both hypochlorite bleaching performance and stability.
We have also found that, in the preferred embodiment where the hypochlorite bleach compositions according to the present invention further comprise a Ca/Mg precipitation system, i.e. carbonate salts together with silicate salts, outstanding whiteness and fabric safety performance are provided. Indeed, it has surprisingly been found that the use of the specific complexing agent as herein defined, or mixtures thereof, together with said Ca/Mg precipitation system results in a synergistic effect on whiteness performance.
A further advantage of the compositions of the present invention is that in addition to their outstanding whitening action said compositions allow also good stain removal.
In the field of the dish washing compositions, EP-266 904 discloses compositions having a pH of from 7 to 12.5 which, among other ingredients, may comprise hypochlorite, from 5% to 50% by weight of the composition of pyridine derivatives as the builder, carbonate and silicate salts. No level of hypochlorite is di
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Agostini Francesco
Caire Giuseppe
Aylor Robert B.
Medley Margaret
The Procter & Gamble & Company
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