Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1998-03-23
1999-06-08
Anthony, Joseph D.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510192, 510373, 510419, 25218625, 25218626, 25218627, 25218633, C11D 339, C11D 3395, C01B 15055, C01B 1508
Patent
active
059104732
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/US96/05335 filed Apr. 19, 1996.
TECHNICAL FIELD
The present invention relates to colored acidic thickened aqueous liquid compositions, more particularly to acidic thickened aqueous compositions comprising a source of active oxygen and a given dye at a given level. Said compositions find particular application in the cleaning of hard-surfaces, especially inclined hard-surfaces, such as toilet bowls and the like.
BACKGROUND
A great variety of bleaching and cleaning compositions have been described in the art. Bleaching/cleaning compositions comprising a source of active oxygen and formulated at low pH are particularly interesting for the cleaning of hard-surfaces, especially for the hygienic cleaning of sanitary fittings such as toilet bowls and the like.
European co-pending application 94870184.2 discloses acidic thickened aqueous compositions comprising persulfate salts and as the thickening system a quaternary ammonium compound together with a short chain amine oxide (C6 to C10).
It is desirable to formulate acidic compositions comprising a source of active oxygen such as persulfate salts with an adequate viscosity, so that said compositions have a consumer acceptable residence time on the surface to be cleaned. In other words, it is desired from a consumer point of view to provide compositions having greater residence time on non-horizontal surfaces such as inclined wall of a toilet bowl when applied thereto, allowing thereby that said compositions perform their cleaning action for longer periods of time. It has now been found that the consumer perception of the viscosity of a given thickened composition applied onto a non-horizontal surface is driven not only by the real viscosity of said composition per se but even by the level of dye present in said composition. Indeed, it has been observed that the higher the dye level, the thicker the composition is perceived by the consumer when applied on a non-horizontal surface like toilet bowls.
It is further desirable that such compositions be easily rinsed away from said surfaces, especially because viscous products have a good cling onto said surfaces. We have now found that the consumer perception of the rinsing of a given thickened composition applied onto a non-horizontal surface like toilet bowls, is driven not only by the real amount of said composition that remains onto said surface after having being rinsed away for example by flushing, but also by the level of dye present in said composition. It has been observed that the higher the dye level, the more product is perceived by the consumer to remain on said surface after flushing, which is detrimental from a consumer point of view.
It is thus an object of the present invention to formulate colored acidic thickened aqueous compositions comprising a source of active oxygen and a dye, said compositions being perceived concomitantly as being more viscous and easy to rinse away from a consumer standpoint.
Also, when formulating colored acidic aqueous compositions, which comprise a source of active oxygen such as monopersulfate salts, stability problems appear, i.e., in general peroxy-bleaches raise compatibility issues in relation with the kind of dyes used and the levels of dyes because dyes themselves and/or the metals present in the dyes may catalyse the peroxide decomposition.
It is thus also an object of the present invention to provide a colored acidic thickened aqueous composition comprising a source of active oxygen, in particularly a persulfate salt, which is chemically stable.
It has now been found that the above mentioned objects could be met by formulating acidic thickened aqueous compositions comprising a source of active oxygen with a dye which is chemically and physically stable in said medium, i.e., an .alpha. or .beta. metal phthalocyanine dye, or mixtures thereof at optimised levels. Indeed, it has been found that by carefully defining the level of said .alpha. or .beta. metal phthalocyanine dye, or mixtures thereof, compositions are perceived thicke
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Alfano Stefano
Bianchetti Giulia Ottavia
Fabri Franca
Pace Luigi
Anthony Joseph D.
Aylor Robert B.
The Procter & Gamble & Company
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