Compositions – Oxidative bleachant – oxidant containing – or generative – Free halogen or oxy-halogen acid type
Patent
1999-02-23
2000-11-28
Anthony, Joseph D.
Compositions
Oxidative bleachant, oxidant containing, or generative
Free halogen or oxy-halogen acid type
25218725, 25218727, 25218728, 25218734, 2521872, 81081, C01B 1106, C01B 1104, D06L 306
Patent
active
061531200
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to bleaching compositions, in particular to hypochlorite bleaching compositions, suitable for use in laundry applications such as hand and machine laundry methods.
BACKGROUND OF THE INVENTION
Bleaching compositions are well-known in the art. Amongst the different bleaching compositions available, those relying on bleaching by hypohalite bleaches such as hypochlorite are often preferred, mainly for performance reasons, especially at lower temperature.
However, a problem encountered with the use of hypochlorite based-compositions is the resulting damage and/or yellowing of the fabrics being bleached.
It is therefore an object of the invention to provide a hypohalite-containing composition, suitable for use in laundry applications, which provides improved fabric whiteness to fabrics treated therewith.
It is another object of the invention to provide a hypohalite-containing composition, suitable for use in laundry applications, which provides improved fabric safety to fabrics treated therewith.
To fulfill such needs, pH buffering components such as silicates have been incorporated in hypochlorite compositions. A typical disclosure can be found in EP-A-0,653,483.
The Applicant has thus now surprisingly found that this problem is solved by the use, in a hypohalite bleaching composition containing a pH buffering component, of an ingredient having the ability to prevent the precipitation of the salts of said buffering component upon dilution of the composition in water. Indeed, it has been found that improved fabric whiteness and/or safety were obtained with the composition of the invention compared to hypohalite compositions containing a pH buffering component but no ingredient having the ability to prevent the precipitation of the salts of said buffering component upon dilution of the composition in water.
Another advantage of the compositions of the invention is that they are chemically stable. By "chemically stable", it is meant that the hypohalite bleaching compositions of the present invention should not undergo more than 15% loss of available chlorine after 5 days of storage at 50.degree. C..+-.0.5.degree. C. The % loss of available chlorine may be measured using the method described, for instance, in "Analyses des Eaux et Extraits de Javel" by "La chambre syndicale nationale de L'eau de Javel et des produits connexes", pages 9-10 (1984). Said method consists in measuring the available chlorine in the fresh compositions, i.e. just after they are made, and in the same compositions after 5 days at 50.degree. C.
A further advantage of the compositions of the invention is that they are suitable for the bleaching of different types of fabrics including natural fabrics (e.g., fabrics made of cotton, viscose, linen, silk and wool), synthetic fabrics such as those made of polymeric fibers of synthetic origin as well as those made of both natural and synthetic fibers. Indeed, the compositions of the present invention may be used on synthetic fibers despite a standing prejudice against the use of hypohalite bleaches, especially hypochlorite bleaches, on synthetic fibers, as evidenced by warning on labels of commercially available hypochlorite bleaches and clothes.
SUMMARY OF THE INVENTION
The present invention is a liquid bleaching composition comprising salts of said buffering component upon dilution of the composition in water; with the proviso that where said ingredient is a polyacrylate polymer, the polymer is present in an amount of less than 0.5% by weight.
In another aspect of the invention, a solid bleaching composition is provided comprising: salts of said buffering component upon dilution of the composition in water.
The present invention also encompasses a process of bleaching fabrics with a composition comprising: salts of said buffering component upon dilution of the composition in water; said composition in water.
The present invention also encompasses the use, in a hypohalite bleaching composition comprising a pH buffering component, of an ing
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Briatore Andrea
Di Capua Gloria
Scialla Stefano
Anthony Joseph D.
Camp Jason J.
Reed T. David
The Procter & Gamble & Company
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