Compositions – Oxidative bleachant – oxidant containing – or generative – Plural oxidants
Patent
1997-06-13
1999-03-09
Anthony, Joseph D.
Compositions
Oxidative bleachant, oxidant containing, or generative
Plural oxidants
25218638, 562 4, 562 2, 562 3, 510312, C01B 1510, C11D 3395
Patent
active
058795847
DESCRIPTION:
BRIEF SUMMARY
This is a 35 U.S.C. .sctn.371 Application from PCT/US95/11284, filed Sep. 8, 1995.
TECHNICAL FIELD
The present invention relates to a process for manufacturing aqueous compositions comprising peracids (percarboxylic acids) and more particularly to a process for manufacturing aqueous emulsions comprising a peracid, or mixtures thereof. The aqueous compositions prepared according to the process of the present invention are particularly suitable to be used in various applications such as in laundry applications, or as hard-surface cleaners or as carpet cleaners, or as denture cleaners or as disinfecting compositions in general.
BACKGROUND
A great variety of cleaning compositions have been described in the art. Indeed, compositions comprising hydrogen peroxide, and/or water soluble sources thereof including peracids are widely used. In order to provide such compositions comprising peracids, it is common practice to use peracid precursors as a source of said peracids. Indeed, peracids are not commonly commercially available, and if available may not be used satisfactorily, as said peracids are not stable and tend to decompose dramatically during storage, this even before their incorporation into a composition. Compositions containing such peracids can be made by a variety of methods employing reactions between hydrogen peroxide and the corresponding peracid precursors, i.e. the corresponding acids. However, such methods are not fully satisfying. Indeed, there is a need for the development of processes for manufacturing aqueous compositions with better productivity in several respects, e.g. formulators are looking for a process which allows to incorporate higher amounts of peracids in a finished product, starting from a given amount of the corresponding precursors.
It is therefore an object of the present invention to provide a process for improving the efficiency of producing peracids.
We have now found that this object can be efficiently met by reacting a concentrated hydrogen peroxide solution with, as the precursor of the peracid, the corresponding anhydride instead of the corresponding acid. Indeed, it has been found that a faster preparation as well as a higher yield of said peracid are achieved when reacting with a concentrated hydrogen peroxide solution, the corresponding anhydride, as compared to reacting with said concentrated hydrogen peroxide solution, the corresponding acid instead of said corresponding anhydride, as said precursor of said peracid. In other words, it has been found that a process which comprises the step of reacting the corresponding precursor being in an anhydride form with a concentrated hydrogen peroxide solution leads to faster preparation of compositions comprising a higher amount of said peracid, starting from a given amount of said precursor.
An advantage of a process according to the present invention is that it allows for great flexibility in formulating and provides compositions comprising peracid suitable to be used in the most efficient manner by the consumer. Indeed, such a composition can be a raw material composition, or can be a fully formulated detergent composition comprising additional ingredients such as those commonly used in the detergent field. Preferred herein is a process which allows to provide compositions with high amounts of peracids, said compositions being in the form of emulsions. Indeed, an advantage associated with the emulsions obtained according to a process of the present invention is that such compositions not only incorporate a higher amount of a peracid, starting from a given amount of the corresponding anhydride but also allow to provide a finished product having improved stability during storage, i.e. in emulsions the rate of decomposition of peracids contained therein is reduced, as compared to compositions being not in the form of emulsions.
Processes for the preparation of compositions or even emulsions comprising a bleach have been disclosed in the art. For instance, EP-A-598170 discloses the use of emulsions to formulate compositi
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Bianchetti Giulia Ottavia
Campestrini Sandro
Di Furia Fulvio
Scialla Stefano
Anthony Joseph D.
Aylor Robert B.
The Procter & Gamble & Company
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