Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
1999-09-27
2001-11-06
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...
C510S302000
Reexamination Certificate
active
06313082
ABSTRACT:
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.
The Applicant has thus now surprisingly found that this problem is solved by the provision, in a hypohallite bleaching composition, of a phosphate ingredient. Indeed, it has been found that improved fabric whiteness and/or safety were obtained with the composition of the invention compared to hypohalite compositions without said phosphate ingredient. The benefits are particularly noticeable in hypohalite bleaching compositions which further comprise a pH buffering component.
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° C. ±0.5° 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 syndicate 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° 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 cofton, 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.
EP 0 188 145 discloses bleaching compositions comprising trisodium phosphate. J53081789 discloses compositions comprising hypochlorite and a phosphate ingredient for the cleaning of carpets. J03137278 discloses a composition comprising hypochlorite and a phosphate ingredient for the bleaching of indigo-dyed cloth. J08081878 discloses bleaching compositions with a phosphate ingredient for the bleaching of raw textiles. None of these prior art documents discloses the fabric whiteness and safety benefits obtained from the provision of a phosphate ingredient in a hypochlorite composition.
SUMMARY OF THE INVENTION
The present invention is a liquid or solid bleaching composition comprising
a hypohalite bleach,
a pH buffering component in an amount of 0.5% to 9% by weight, and
an effective amount of a phosphate ingredient.
The present invention also encompasses a process of treating fabrics where said fabrics are immersed in a bleaching solution formed by diluting said bleaching composition in water.
The present invention further encompasses the use, in a hypohalite bleaching composition, of a phosphate ingredient, for providing improved fabric whiteness and/or safety to the fabrics treated therewith.
REFERENCES:
patent: 3639284 (1972-02-01), Long et al.
patent: 4681696 (1987-07-01), Bruegge et al.
patent: 5746936 (1998-05-01), Mercado
Briatore Andrea
Di Capua Gloria
Scialla Stefano
Camp Jason J.
Gupta Yogendra N.
Hughett Eileen L.
Petruncio John M
The Procter & Gamble & Company
LandOfFree
Bleaching compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bleaching compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bleaching compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2617933