Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1998-05-06
2000-02-15
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510475, 510514, C11D 337
Patent
active
060253142
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the use of cationic polymers as soil release compounds in rinse aids for dishwashing machines.
Commercial rinse aids for dishwashing machines 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 these rinse aids is to influence the surface tension of the water in such a way that the water is able to drain off the dishes in the form of a thin coherent film so that no droplets of water, streaks or films are left behind after the subsequent drying process. An overview of the composition of rinse aids and methods for testing their performance was published by W. Schirmer et al. in Tens. Surf. Det. 28, 313 (1991).
In machine dishwashing, it occasionally happens that firmly adhering soils such as, for example, oat flakes and starch deposits are not completely removed during the cleaning process.
2. Discussion of Related Art
It is known from EP-A-0 167 382, EP-A-0 342 997 and DE-OS 26 16 404 that cationic polymers can be added to dishwashing detergents to obtain streak-free cleaning of the surfaces.
EP-A-0 167 382 describes liquid detergent compositions which may contain cationic polymers as thickeners. Hydroxypropyl trimethyl ammonium guar, copolymers of aminoethyl methacrylate and acrylamide and copolymers of dimethyl diallyl ammonium chloride and acrylamide are described as particularly suitable cationic polymers.
EP-A-0 342 997 describes multipurpose cleaners which may contain cationic polymers, more particularly polymers containing imino groups.
DE-OS 26 16 404 describes glass cleaners containing cationic cellulose derivatives. The addition of the cationic cellulose derivatives improves drainage of the water so that no streaks are left behind on the cleaned glass.
EP-A-0 467 472 describes hard surface cleaners containing cationic homopolymers and/or copolymers as so-called soil release polymers. These polymers contain quaternized ammonium alkyl methacrylate groups as monomer units. These compounds are used to finish the surfaces in such a way that the soils are easier to remove the next time the surfaces are cleaned.
The documents cited above disclose the use of cationic polymers in cleaning formulations. There is nothing in any of these documents to indicate how it is possible in machine dishwashing to facilitate the removal of obstinate soils, for example starch-containing soils.
The problem addressed by the present invention was to provide a rinse aid which would enable firmly adhering soils, such as oat flakes and other starch deposits, to be readily removed from the dishes in subsequent cleaning cycles.
DESCRIPTION OF THE INVENTION
The present invention relates to the use of cationic polymers selected from cationic polymers of copolymers of monomers, such as trialkyl ammonium alkyl (meth)acrylate or acrylamide; dialkyl diallyl diammonium salts; polymer-analog reaction products of ethers or esters of polysaccharides containing ammonium side groups, more particularly guar, cellulose and starch derivatives; polyadducts of ethylene oxide containing ammonium groups; quaternary ethylene imine polymers and polyesters and polyamides containing quaternary side groups as soil release compounds in rinse aids for dishwashing machines.
It has surprisingly been found that, if soil release compounds are added to the rinse aid in machine dishwashing, firmly adhering and often critical soils, for example starch-containing soils, can be completely removed in the next dishwashing cycle. These soils can be removed without any need for additional manual cleaning of the dishes.
Suitable cationic polymers are, in particular, water-soluble homopolymers or copolymers containing monomer units corresponding to formula I: ##STR2## in which hydrogen or a C.sub.1-8 alk(en)yl group, R.sup.8 is a linear, cyclic or branched alkylene group containing 2 to 8 carbon atoms and anion.
Other su
REFERENCES:
patent: 4101456 (1978-07-01), Renaud et al.
patent: 4454060 (1984-06-01), Lai et al.
patent: 5374716 (1994-12-01), Biermann et al.
patent: 5576425 (1996-11-01), Hill et al.
Tens. Surf. Det. 28: 313-319 (1991).
Buchmeier Willi
Fischer Herbert
Jeschke Peter
Nitsch Christian
Schieferstein Ludwig
Gupta Yogendra
Hardee John R.
Henkel Kommanditgesellschaft auf Aktien
J. Murphy Glenn E.
Jaeschke Wayne C.
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