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US 5,672,578 AGranted
Limescale removing compositions
AssigneeThe Procter & Gamble Company
InventorsMichel Jean Carrie, Eddy Vos
Life of this patent
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Abstract
Limescale removing compositions contain a low level of surfactant, i.e., less than about 1% and maleic acid and have a pH of from about 0.1 to about 4.5. The surfactant can be anionic, nonionic, amphoteric, or cationic, but is preferably cationic. The composition can be used neat, or diluted, by applying it to the surface to be treated, leaving it to react, and then rinsing.
Claims12
An aqueous composition suitable for descaling appliances having a pH of from about 0.1 to about 4.5, comprising maleic acid and a surfactant or mixture of surfactants of the formula
- R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+ X.sup.-,
- wherein X.sup.- is a counteranion, R.sub.1 is a C.sub.8 -C.sub.20 hydrocarbon chain and R.sub.2, R.sub.3 and R.sub.4 are independently selected from H or C.sub.1 -C.sub.4 hydrocarbon chains.
Dependencies are inferred from the claim text.