Cleaning compositions for solid surfaces – auxiliary compositions – Auxiliary compositions for cleaning – or processes of preparing – Surfactant composition for cleaning agents
Patent
1995-06-19
1997-02-04
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Auxiliary compositions for cleaning, or processes of preparing
Surfactant composition for cleaning agents
510235, 510236, 510237, 510405, 510427, 510470, 510537, C11D 322, C11D 1825, C11D 183, C11D 1100
Patent
active
055997872
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process for improving the low-temperature stability of aqueous anionic surfactant solutions by addition of a mixture of selected nonionic surfactants, to manual dishwashing detergents containing these mixtures and to the use of this mixture for the production of aqueous anionic surfactant solutions having improved low-temperature stability.
2. Statement of the Related Art
Most manual dishwashing detergents contain anionic surfactants as their active components. Typical primary surfactants are alkylbenzene sulfonates, secondary alkane sulfonates, fatty alcohol ether sulfates and alkyl sulfates. These surfactants are present in the formulations in total concentrations of up to about 30% by weight, high-performance synergistic combinations essentially being used. Suitable co-surfactants or secondary surfactants are, for example, betaines, fatty acid alkanolamides, amine oxides and ether carboxylic acids which are used in much smaller quantities. Their function is to increase washing power and foam stability (cf. Seifen-Ole-Fette-Wachse 115, 149 (1989)).
One of the problems involved in the formulation of such detergents lies in the comparatively poor low-temperature stability of aqueous anionic surfactant solutions. Accordingly, unwanted clouding can occur, particularly when formulations or part-formulations have to be stored for a certain time before use. If it is stored outside, the product can even solidify.
In this connection, foaming detergent mixtures of anionic surfactants, alkyl oligoglucosides and, optionally, amine oxides and their use as dishwashing detergents are proposed in European patents EP-B 0 070 074, EP-B 0 070 075, EP-B 0 070 076 and in EP-B 0 075 995 and EP-B 0 075 996 (Procter & Gamble). However, the low-temperature stability of the mixtures is not significantly improved by the addition of the nonionic surfactants mentioned.
In addition, German patent application DE-A1 40 25 065 (Henkel) describes aqueous surfactant mixtures which, in addition to alkyl oligoglucosides and mixtures of long-chain and short-chain alkyl sulfates, may also contain fatty alcohol polyethylene glycol ethers, preferably adducts of 3 to 10 mol ethylene oxide with C.sub.10-20 fatty alcohols. The surfactant compounds are used as premixes in the production of liquid detergents. However, this patent application does not refer to the low-temperature stability of the mixtures or to their advantageous use in manual dishwashing detergents.
Accordingly, the problem addressed by the present invention was to provide a process for the production of aqueous anionic surfactant solutions which would be free from the disadvantages mentioned above.
DESCRIPTION OF THE INVENTION
The present invention relates to a process for the production of aqueous solutions of anionic surfactants having improved low-temperature stability, in which mixtures of nonionic surfactants containing
a) alkyl and/or alkenyl oligoglycosides corresponding to formula (I) carbon atoms, G is a sugar unit containing 5 or 6 carbon atoms and p is a number of 1 to 10,
b) fatty alcohol polyglycol ethers corresponding to formula (II) ##STR3## in which R.sup.2 is an alkyl radical containing 8 to 11 carbon atoms, n is a number of 4 to 9 and m=0 or is a number of 1 to 3, and optionally
c) fatty alcohol polyglycol ethers corresponding to formula (III) ##STR4## in which R.sup.3 is an alkyl radical containing 12 to 15 carbon atoms, n is an integer of 4 to 9 and m=0 or is a number of 1 to 3,
The aqueous solutions of which the low-temperature behavior is to be improved by the process according to the invention may contain, for example, artionic surfactants selected from the group consisting of alkylbenzene sulfonates, alkane sulfonates, olefin sulfonates, alkyl ether sulfonates, glycerol ether sulfonates, .alpha.-methyl ester sulfonates, sulfofatty acids, alkyl sulfates, fatty alcohol ether sulfates, glycerol ether sulfates, hydroxy mixed ether sulfates, monoglyceride (ether) sulfates, fatty
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Seifen- Ole-Fette-Wachse 115, 149 (1989) (no month available).
J. Falbe (ed.), "Surfactants in Consumer Products", Springer Verlag, Berlin, 1987, pp. 54 to 124 (no month available).
J. Falbe (ed.), "Katalysatoren, Tenside und Mineral oladditive" (Catalysts, Surfactants and Mineral Oil Additives), thieme Verlag, Stuggart, 1978, pp. 123-217 (no mo. available).
Giesen Brigitte
Schmid Karl
Syldath Andreas
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
Hertzog Ardith
Jaeschke Wayne C.
Millson Jr. Henry E.
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