Cleaning compositions for solid surfaces – auxiliary compositions – Auxiliary compositions for cleaning – or processes of preparing – Dishwasher rinse composition
Patent
1996-02-28
1997-11-25
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Auxiliary compositions for cleaning, or processes of preparing
Dishwasher rinse composition
510502, 510221, 510223, 510423, 510433, 510434, 510470, 510475, 510477, 510506, C11D 332, C11D 1825, C11D 172, C11D 322
Patent
active
056913001
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to new rinse aids essentially containing fatty acid N-alkyl polyhydroxyalkyl glucamides for the machine washing of hard surfaces and to the use of these substances for the production of the rinse aids.
2. Discussion of Related Art
Commercial rinse aids are mixtures of low-foaming fatty alcohol polyethylene/polypropylene glycol ethers, solubilizers (for example cumene sulfonate), organic acids (for example citric acid) and solvents (for example ethanol). The function of rinse aids is to influence the interfacial tension of the water in such a way that it is able to drain from the rinsed surfaces in the form of a thin coherent film, so that no water droplets, streaks or films remain behind during the subsequent drying process. A review of the composition of rinse aids and methods for testing their performance can be found in W. Schirmer et al. in Tens. Surf. Det. 28, 313 (1991).
In addition, where modern phosphate-free low-alkali detergents are used for machine dishwashing, lime and silicate coatings can form on the rinsed surfaces and on the inside of the dishwashing machine because the calcium binding power of these detergents is lower than that of conventional phosphate-containing products. Troublesome lime and silicate coatings occur in particular when the rinsing water of the dishwashing machine has not been softened sufficiently, if at all, and a water hardness of 4.degree. d is exceeded. In cases such as these, lime and silicate coatings can be effectively avoided by introducing citric acid into the final rinse cycle through the rinse aid. However, since the quantities of rinse aid normally added during the final rinse are very small (3 ml to 6 ml), the citric acid content in rinse said formulations intended to guarantee effective inhibition of coatings has to be relatively high to achieve an adequate acid or complexing capacity. Citric acid contents as high as these support the effect of the phosphate substitutes and guarantee spotless dishes.
International patent application WO 88/09369 describes water-based liquids for dishwashing machines which contain C.sub.8-16 alkyl oligoglucosides, low-foaming fatty alcohol polyglycol ethers and alkali metal citrates. However, these liquids are unsuitable as rinse aids.
European patent application EP-A2 0 432 836 (Unilever) describes rinse aid formulations for dishwashing machines which contain only one surfactant, namely alkyl oligoglucosides, and foam inhibitors and thickeners as additional constituents. Foam inhibitors are an essential constituent of these formulations because alkyl oligoglucosides are generally high foamers and would cause unacceptable foaming in the described rinse aid formulations when used in dishwashing machines. However, defoamers are only effective providing they do not dissolve in the medium to be foam-inhibited. Accordingly, the alkyl oligoglucoside solutions and the foam inhibitors are not miscible with one another in the examples of rinse aids mentioned in this document. Accordingly, two phases would exist if a thickener providing for a certain degree of homogenization had not been used to disperse them. However, one disadvantage of such a formulation is the latent inhomogeneity caused by the foam inhibitor. The foam inhibitor and surfactant solution of the rinse aid separate after only a short time, despite the presence of a thickener. A product such as this is understandably unsuitable both for consumers of branded goods and for large-scale use, because both sectors require products which must remain stable in storage for prolonged periods, but at least for one year. Accordingly, the only suitable formulations are one-phase formulations in which all the constituents are homogeneously dissolved and which not only remain stable in storage, but also do not separate during the heating and cooling phase of the rinse cycle, i.e. phase stability must be guaranteed in the temperature range of the dishwashing machine of 0.degree. C. to 65.degree. C. On the oth
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Burg Birgit
Fabry Bernd
Haerer Juergen
Hees Udo
Jeschke Peter
Boyer Charles I.
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lieberman Paul
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