Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Reexamination Certificate
2002-05-06
2004-08-17
Mruk, Brian P (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
C510S220000, C510S356000, C510S360000, C510S413000, C510S421000, C510S470000, C510S505000, C510S506000, C510S521000, C510S524000, C510S535000, C568S613000, C568S622000, C523S400000, C523S406000, C134S025200, C134S025300, C134S039000, C134S040000, C134S042000
Reexamination Certificate
active
06777384
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to gemini surfactants, optionally in combination with ingredients customary in laundry detergents, dishwashing detergents and cleaners, optionally with further nonionic surfactants and anionic surfactants, and to the use of such gemini surfactants for improving the wetting behavior and compatibility with plastics, for the simplified preparation of solid cleaners and as foam-suppressing surfactant in rinse aid formulations.
Compositions for the washing and cleaning of hard nontextile surfaces which are intended for the household and industrial sector, which mostly develop, upon use, a small volume of foam which further decreases significantly within a few minutes. Compositions of this type have been known for a long time and are established in the market. These are essentially aqueous surfactant solutions of varying type with or without the addition of builders, solubility promoters (hydrotropic agents) or solvents. However, to demonstrate the effectiveness, a certain foaming of the application solution at the start of the cleaning operation is desired by the consumer, although the foam should rapidly collapse so that surfaces which have been cleaned once do not have to be wiped again. For this purpose, low-foaming nonionic surfactants are usually added to compositions of said type.
Nowadays, higher requirements are placed on dishes washed by machine than on dishes washed manually. For example, an item of tableware which has been completely cleaned of food residues is not assessed as perfect if, after the machine dishwashing, it still has whitish marks based on water hardness or other mineral salts which, for a lack of wetting agents, originate from dried-up water drops.
In order to obtain gleaming and spotless tableware, a rinse aid is therefore used. The addition of a liquid or solid rinse aid, which may be added separately or is already in ready-to-use presentation form with the detergent and/or regenerating salt (“2 in 1”, “3 in 1”, e.g. in the form of tabs and powders), ensures that the water runs off as completely as possible from the ware, so that the various surfaces are residue-free and gleaming at the end of the wash program.
Commercially available rinse aids are mixtures of, for example, nonionic surfactants, solubility promoters, organic acids and solvents, water and optionally preservatives and fragrances. The aim of the surfactants in these compositions is to influence the interfacial tension of the water so that it can run off from the wear in the thinnest possible coherent film so that, during the subsequent drying operation, no water drops, streaks or films remain (wetting action or wetting behavior).
For this reason, surfactants in rinse aids must also suppress the foam which arises as a result of food residues in the dishwashing machine. Since most rinse aids comprise acids to improve the clear drying effect, the surfactants used must additionally be relatively hydrolysis-insensitive toward acids.
Rinse aids are used both domestically and in industrial sectors. In domestic dishwashers the rinse aid is mostly metered in after the prerinse and washing cycle at just under 40° C.-65° C. Industrial dishwashing machines operate with only one wash liquor which is only replaced by the addition of the rinse aid solution from the previous wash cycle. There is thus no complete water change during the entire wash program. For this reason, the rinse aid must also have a foam-suppressing action, be thermally stable at a sharp temperature gradient of 85-35° C. and, in addition, must be sufficiently stable toward alkali and active chlorine.
An object of the present invention was to provide laundry detergents, dishwashing detergents and cleaners which simultaneously exhibit good foaming behavior and cleaning behavior, but in particular very good run-off behavior, i.e. an improvement in the wetting behavior on plastic surfaces, and high material compatibility, in particular with plastics. In addition, the aim was to be able to prepare simplified solid cleaner formulations. The object was achieved by using selected surfactants of the gemini surfactant type.
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Elsner Michael
Raths Hans-Christian
Weuthen Manfred
Cognis Deutschland GmbH & Co. KG
Drach John E.
Mruk Brian P
Trzaska Steven J.
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