Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1994-09-22
1996-09-24
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510302, 510307, 510326, 510356, 510361, 510370, C11D 172, C11D 304, C11D 3395
Patent
active
055590900
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to aqueous bleaching compositions, for laundry or hard surfaces. The compositions according to the present invention, which comprise hydrogen peroxide, are stable upon storage and have reduced tendency to foam.
BACKGROUND
Aqueous, hydrogen peroxide-containing compositions are well known in the art. In such compositions, the hydrogen peroxide spontaneously tends to undergo a decomposition process whereby the available oxygen in the composition, thus its bleaching power, decreases with time. This decomposition process particularly represents a problem in bleaching compositions for consumer use, since these compositions need to have a long life time, in order to retain their original characteristics throughout shipping, shelf and home storage. The self-decomposition process of hydrogen peroxide increases with temperature, thus this problem is even more acute in warm climate countries.
Also, it has been observed that hydrogen peroxide-containing compositions produce heaving foaming during their manufacturing process and their use; thus, these compositions typically need foam regulating compounds, typically silicone-based compounds, which are detrimental to the hydrogen peroxide's stability, and which increase the composition's manufacturing cost.
It is thus an object of the present invention to formulate an aqueous bleaching composition, which comprises hydrogen peroxide and which is stable during long periods of storage.
It is another object of the present invention to provide aqueous bleaching compositions comprising hydrogen peroxide which produce little foaming during their manufacture and use.
It has now been found that these objects could be effectively and simply met by incorporating in these compositions a specific class of nonionic surfactants. These surfactants have indeed been found to produce a stabilizing effect on hydrogen peroxide as well as a foam regulating effect. Other objects and advantages of the present invention will appear from the following description.
J62270509 (abstract) discloses aqueous bleaching compositions comprising hydrogen peroxide, citric acid and a mixture of anionic and nonionic surfactants.
EP 241 137 discloses aqueous bleaching compositions comprising hydrogen peroxide, a bleach activator and surfactants.
EP 276 050 discloses the use of Br or Cl-containing surfactants as anti foaming compounds in aqueous solutions comprising hydrogen peroxide.
U.S. Pat. No. 4,430,236 discloses aqueous bleaching compositions comprising hydrogen peroxide and a mixture of anionic and nonionic surfactants.
U.S. Pat. No. 3,970,575 discloses a bleaching composition comprising hydrogen peroxide, which is stabilized by acidity.
SUMMARY OF THE INVENTION
The compositions according to the invention are aqueous bleaching compositions having a pH of from 2 to 6, which comprise from 1% to 15% by weight of the total composition of hydrogen peroxide and a surfactant system, characterized in that the surfactant system comprises a compound of the formula hydrocarbon chain; the total composition of citric acid.
DETAILED DESCRIPTION OF THE INVENTION
The compositions according to the invention are aqueous compositions comprising from 1% to 15% by weight of the total composition of hydrogen peroxide, preferably 2% to 10%, most preferably 3% to 8%.
The compositions according to the present invention further comprise a surfactant system, characterized in that it comprises a compound of the formula preferably alkyl; hydrocarbon chain, preferably a methyl substituted ethylene; preferably H;
or mixtures thereof.
It is to be understood that, in the chemical formula above, R.sub.2 O and R.sub.3 O groups may appear in any sequence in the molecule; also, when n and m are greater than 1, different R.sub.2 O and R.sub.3 O groups may appear in a same molecule.
These compounds have been found to provide a stabilizing effect on the compositions in that the self decomposition of hydrogen peroxide is decreased. Furthermore, these compounds have a regulating effect on t
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Cardola Sergio
Scialla Stefano
Delcotto Gregory R.
Krivulka Thomas G.
McGinty Douglas J.
Reed T. David
The Procter & Gamble & Company
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