Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1998-01-13
1999-07-20
Douyon, Lorna
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510279, 510283, 510299, 510320, 510338, 510342, 510406, 8137, C11D 320, C11D 1700, D06L 102
Patent
active
059256087
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a packaged product comprising a foaming composition and a propellant gas packaged within a container. In particular the packaged product is a foam dispensing aerosol container.
It is well known in the aerosol industry that there is a need to move out HFC propellants on account of their environmental profile. The replacement choice has mostly been the low molecular weight hydrocarbons such as propane, butane, pentane, hexane, etc., but these are flammable gases which may not always be suitable for use inside confined appliances with potential ignition sources. For these reasons, the industry is seeking a move to more environmentally friendly chemicals.
Replacing the organic propellants, such as those listed above, by non-liquifiable propellant gases presents new problems. Unlike more conventional liquifiable organic propellant gases, gases such as carbon dioxide and nitrous oxide cannot be liquified at the pressures obtainable in an aerosol container (i.e. typically 10 to 12 bar maximum). As the foaming composition is progressively emptied out of the aerosol canister the carbon dioxide or nitrous oxide in the headspace cannot be replenished as would be the case with liquifiable propellants, and consequently the pressure in the headspace drops. If the headspace pressure drops too low it will no longer be possible to dispense a foam from the aerosol container.
Attempts to address this problem have included the use of microporous structures to adsorb non-liquifiable propellant gas (such as carbon dioxide), thereby providing a "reservoir" of gas from which the headspace pressure can be replenished.
EP-A 0 385 773, published on Sep. 5, 1990, discloses a gas storage system comprising a polymeric material, such as hydrogel, having microvoids functioning as interstitial stores for gas.
DD-A 246 784, published on Jun. 17, 1987, discloses cosmetic and pharmaceutical foam aerosols containing 5-50% of CO2-charged aluminosilicate. It is claimed that filling rates are high, pressure peaks are avoided, and pressure is substantially constant up to complete emptying of the aerosol package.
The applicants co-pending European Patent Application number 94870189.1, filed on Dec. 5, 1994, discloses a foaming detergent composition for cleaning textile fabrics which may be dispensed with the aid of propellants including hydrofluorocarbons (HFCs) or low molecular weight hydrocarbons.
Foaming compositions which are concentrated in terms of active components, and have a correspondingly low water content may not be suitable for dispensing with carbon dioxide or nitrous oxide because the aerosol container cannot be completely emptied. Furthermore microporous gas adsorbant agents may be undesirable for economic reasons.
The present invention is concerned with a means of delivering a concentrated foam without the need for microporous gas adsorbant agents.
The object of the invention is to provide a packaged product comprising a foaming composition comprising a surfactant system and wherein the foaming composition comprises less than 25% by weight, preferably less than 15% by weight, of water; a propellant gas; and a container; such that the foaming composition may be completely dispensed from a container by an environmentally-friendly (inorganic) propellant gas.
A further object of the invention is to provide a low water composition which reduces the formation of HCO.sub.3 - ions when carbon dioxide is the propellant gas. The formation of these ions results in lower propellant gas efficiency because the carbon dioxide is converted into bicarbonate.
A further object of the invention is to provide a low water composition suitable for maintaining enzymes in a stable state. In particular the compositions of the present invention are suitable for use with detergent enzymes.
SUMMARY OF THE INVENTION
According to the invention these objects are achieved by a packaged product as specified in claim 1 in which the viscosity of the foaming composition, measured at 20.degree. C. and 1 atmosphere, using a Brookfiel
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Spruyt Michael Felix
Vos Eddy
Douyon Lorna
Goodrich D. Mitchell
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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