Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1993-11-03
1995-08-15
Lieberman, Paul
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
252121, 252132, 252173, 25217417, 252DIG1, 252DIG11, 252DIG14, C11D 932, C11D 112
Patent
active
054416620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
Liquid detergents are an alternative to powder-form detergents, liquid detergents being understood in the following to be pourable products and products of paste-like or salve-like consistency. Compared with powder-form detergents, liquid detergents have certain handling advantages and other performance features. In particular, larger quantities of nonionic surfactants can be incorporated in liquid detergents than in powder-form detergents which has the advantage of greater effectiveness against oily and greasy soil.
2. Statement of Related Art
Liquid detergents have long been known. Nevertheless, there is a need to find further improvements in regard to detergency and the possibility of producing liquid detergents using renewable raw materials. A liquid detergent which can be universally used at washing temperatures of 15.degree. to 90.degree. C. and which is particularly suitable for washing delicate fabrics is known from DE-A-39 20 480. It contains anionic surfactants, nonionic surfactants, alkyl glucosides, soaps of unsaturated and saturated fatty acids, polyhydric alcohol and citric acid in certain ratios by weight. The problem addressed by the present invention was further to improve this detergent.
DESCRIPTION OF THE INVENTION
Accordingly, the present invention relates to a liquid detergent containing anionic surfactants, non-ionic surfactants, alkyl glucosides, soaps of unsaturated and saturated fatty acids, polyhydric alcohol and citric acid, the detergent according to the invention being characterized in that it contains 10 to 20% by weight citric acid. Although the liquid detergent according to DE-A-39 20 480 also contains citric acid, the citric acid content of the detergents according to DE-A-39 20 480 is very much lower, i.e. is below 2% by weight. The content of citric acid according to the invention provides for a distinct improvement in detergency over state-of-the-art detergents, so that better washing results are obtained than with the known detergent for the same dosage or even a lower dosage. On the other hand, equally good detergency can be obtained with a much smaller dose of the detergent according to the invention.
Suitable anionic surfactants for the detergents according to the invention are surfactants of the sulfonate type and particularly of the sulfate type. Suitable sulfates are sulfuric acid monoesters of C.sub.12-18 fatty alcohols, such as for example lauryl, myristyl or cetyl alcohol, and the fatty alcohol mixtures obtained from coconut oil, palm oil and palm kernel oil which may additionally contain unsaturated alcohols, for example oleyl alcohol. Mixtures in which 50 to 70% by weight of the alkyl radicals contain 12 carbon atoms, 18 to 30% by weight 14 carbon atoms, 5 to 15% by weight 16 carbon atoms, less than 3% by weight 10 carbon atoms and less than 10% by weight 18 carbon atoms are preferably used. The percentage content of anionic surfactants in the detergents according to the invention is 3 to 10% by weight.
Nonionic surfactants in the context of the present invention are adducts of 1 to 10 mol ethylene oxide and/or propylene oxide with primary C.sub.12-18 fatty alcohol and mixtures thereof, such as coconut oil fatty alcohol, tallow fatty alcohol or oleyl alcohol. Oxoalcohol ethoxylates are also suitable, but are less preferred because they are produced from fossil raw materials. The nonionic surfactants mentioned may be present in the detergents according to the invention in quantities of 15 to 30% by weight. This figure does not include the alkyl glucosides which also count as nonionic surfactants.
Particularly suitable alkyl glucosides, which are also present in the liquid detergent according to the invention, are glucosides containing a C.sub.8-22 alkyl radical, preferably an alkyl radical consisting essentially of C.sub.12 to C.sub.18 which is derived from lauryl, myristyl, cetyl and stearyl alcohol and from technical fractions preferably containing saturated alcohols. It is particularly preferred to u
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Schwadtke Karl
Sung Eric
Drach John E.
Hailey Patricia L.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lieberman Paul
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