Mixture of at least two alkoxylated alcohols and use thereof as

Details Mixture of at least two alkoxylated alcohols and use thereof as Mixture of at least two alkoxylated alcohols and use thereof as

1993-08-23

1996-07-16

Raymond, Richard L.

Cleaning compositions for solid surfaces, auxiliary compositions

Auxiliary compositions for cleaning, or processes of preparing

Dishwasher rinse composition

252321, 252358, 568618, 568625, 510218, 510219, 510220, 510234, 510506, C11D 1722, C11D 1825

Patent

active

055368840

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/EP92/00289, filed Feb. 11, 1992.


DESCRIPTION

The present invention relates to process for preparing a mixture of alkoxylated alcohols of the general formula I
x is an average degree of ethoxylation of from 1 to 12,
y is an average degree of ethoxylation of from 1 to 15,
In the present invention, one alkoxylated alcohol mixture carries a straight-chain or branched C.sub.8 -C.sub.18 -alkyl group as the radical R and one other alkoxylated alcohol mixture carries a straight-chain or branched C.sub.10 -C.sub.20 -alkyl group as the radical R, subject to the proviso that the two radicals R in each of the mixtures differ by at least 0.5 in the average number of carbon atoms, and the two mixtures of alkoxylated alcohols are present in a ratio of from 10:90 to 90:10.
The present invention also relates to the use of this mixture as a foam-suppressing surfactant additament in cleaning compositions for mechanized cleaning processes. It further relates to cleaning compositions comprising such mixtures of alkoxylated alcohols I.
It is known from practical experience that in mechanized cleaning processes, for example in mechanized dishwashing, it is in general necessary to carry out two successive cleaning cycles, usually separated by an intermediate rinse cycle with water using different cleaning compositions. The actual cleaning liquor comprises alkaline agents for detaching and emulsifying, for example, food residues. The after- or final-rinse liquor, by contrast, comprises specific final rinse compositions for a clear, spot- and streak-free surface, for example on dishes. These compositions must have a good wetting effect so that the rinse water may run off the surface as a film and not leave visible residues, and be readily dispersible in water. Owing to the high degree of liquor agitation in the cleaning and rinsing machines used here, final rinse compositions also must be sufficiently low-foam.
Compositions agents of this type are known in large numbers; examples are wetting agents such as ethylene and/or propylene oxide adducts with alcohols, phenols or amines.
For instance, EP-A-034 275 (1) relates to the use of nonionic surfactants obtained by reacting at least one C.sub.8 -C.sub.20 -alkanol ethoxylate (4-14 EO) with 1,2-butylene oxide in a molar ratio of from 1:1.6 to 1:2.4 in biodegradable and low-foaming cleaning and rinsing compositions.
EP-A-161 537 (2) concerns the use of methyl-, ethyl- or allyl-tipped nonionic surfactants obtainable by stepwise alkoxylation of C.sub.8 -C.sub.22 -alkanols with at least two different alkylene oxides as low-foam, foam-suppressing and biodegradable surfactants in industrial cleaning processes.
EP-B-019 173 (3) concerns the use of C.sub.9 -C.sub.18 -alkanols reacted first with propylene oxide and then with ethylene oxide as low-foam and biodegradable surfactant additaments in dishwashing compositions for dishwashers.
Surfactants of the type mentioned and also mixtures thereof, however, prove to be still in need of improvement when used in cleaning compositions for mechanized cleaning processes. Especially the foam suppression characteristics and the dispersibility in water are still not optimal.
It is an object of the present invention to remedy the above-described defects of the prior art.
We have found that this object is achieved by the above-defined process for preparing a mixture of alkoxylated alcohols I, which comprises mixing at least two mixtures of alcohols of the general formula -C.sub.18 -alkyl groups as the radical R and one other alcohol mixture carries straight-chain or branched C.sub.10 -C.sub.20 -alkyl groups as the radical R, subject to the proviso that the two radicals R differ by at least 0.5 in the average number of carbon atoms, and the two alcohol mixtures are present in a weight ratio of from 10:90 to 90:10, with one another and reacting this mixture first with the corresponding amount of ethylene oxide and then with the corresponding amount of propylene oxide, and the use of such a mixture as a foam-suppressing surf

REFERENCES:
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Tenside Detergents, vol. 19, No. 3, 1982, Von G. de Goederen: "Die Technologie Des Maschinellen Geschirrspulens In Haushalts- Und Gewerblichen Maschinew", pp. 123-126.
Ullmanns Encyklopadie der Technischen Chemie, 4th Edition, vol. 20, 1981, Radionuklide bis Schutzgase, pp. 147-156.
Chemical Abstracts, vol. 95, No. 5, Columbus, Ohio, USA, 1981, abstract No. 82812, "Detergent Compositions", p. 95; & JP, A, 8, 147497 (Mitsubishi Petrochemical), 30 Apr. 1981.

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