Cleaning compositions for solid surfaces – auxiliary compositions – Auxiliary compositions for cleaning – or processes of preparing – Dishwasher rinse composition
Patent
1996-03-21
1998-06-02
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Auxiliary compositions for cleaning, or processes of preparing
Dishwasher rinse composition
510219, 510422, 510434, 510477, 510506, 510535, C11D 1825, C11D 1722, C11D 320
Patent
active
057599874
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to new formulations for the machine cleaning of hard surfaces, more particularly rinse aids, containing mixed ethers and special fatty alcohol polyglycol ethers and to the use of these mixtures for the production of the new formulations.
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 are left after the subsequent drying process. A review of the composition of rinse aids and methods for testing their performance is presented by 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 interior of the dishwashing machine because the calcium binding capacity of these detergents is lower than that of conventional phosphate-containing products. Troublesome lime or silicate coatings occur in particular when the rinsing water of the dishwashing machine has not been softened sufficiently, if at all, and exceeds a hardness of 4.degree. d. In cases such as these, lime silicate coatings can be effectively avoided if citric acid is introduced into the final rinse cycle through the rinse aid. However, since the quantities of rinse aid normally added during the final rinse cycle are very small, i.e. 3 ml to 6 ml, the citric acid content of rinse aid formulations designed to guarantee effective inhibition of coatings has to be relatively high to achieve an adequate acid or complexing capacity. High citric acid contents support the effect of the phosphate substitutes and guarantee spotless crockery.
EP-B1 0 197 434 (Henkel) describes rinse aids which contain mixed ethers as surfactants. Various materials (glass, metal, silver, plastic, china) are washed in dishwashing machines. These various materials have to be thoroughly wetted in the final rinse. Rinse aid formulations containing mixed ethers as their only surfactant component meet these requirements to only a limited extent, if at all, so that the clear-rinse effect or drying effect is unsatisfactory, particularly in the case of plastic surfaces.
In addition, only ingredients which are completely biodegradable and toxicologically safe are now regarded as suitable for use in detergents, including rinse aid formulations. Solventless products are of particular interest in this regard.
Accordingly, the problem addressed by the present invention was to provide new ecologically and toxicologically safe formulations which would perform as well as conventional formulations and which would not have any of the disadvantages mentioned above.
DESCRIPTION OF THE INVENTION
The present invention relates to formulations for cleaning hard surfaces containing ##STR3## in which R.sup.1 is a linear or branched, aliphatic alkyl and/or alkenyl radical containing 8 to 18 carbon atoms, R.sup.2 is a linear or branched alkyl radical containing 1 to 4 carbon atoms or a benzyl radical, m1 has a value of 0 or 1 to 2 and n1 has a value of 5 to 15, and corresponding to formula (II): ##STR4## in which R.sup.3 is a linear or branched, aliphatic alkyl and/or alkenyl radical containing 8 to 16 carbon atoms, m2 has a value of 0 or 1 to 3 and n2 has a value of 1 to 5.
It has surprisingly been found that cleaning formulations, more particularly rinse aids, containing mixed ethers and fatty alcohol polypropylene/polyethylene glycol ethers not only show high ether toxicological compatibility, they also meet the requirements which a commercial product is expected to satisfy in relation to its performance properties.
Another adv
REFERENCES:
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English translation of DE 39 28 600, published Mar. 7, 1991, Jul. 1997.
Tens. Surf. Det. 28, 313 (1991).
Haerer Juergen
Jeschke Peter
Koren Karin
Schmid Karl
Grandmaison Real J.
Hertzog Ardith
Jaeschke Wayne C.
Szoke Ernest G.
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