Compositions – Water-softening or purifying or scale-inhibiting agents
Patent
1993-03-22
1994-11-15
Lieberman, Paul
Compositions
Water-softening or purifying or scale-inhibiting agents
25217421, 252DIG1, 252DIG14, C11D 1825, C11D 172, C11D 1722, C11D 1700
Patent
active
053645529
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a liquid nonionic surfactant combination which is pourable at low temperatures and which is stable in storage over a wide temperature range from -10.degree. to +40.degree. C.
2. Statement of Related Art
Surfactant combinations of the type in question are used in particular as liquid concentrates together with so-called washing alkalis and are particularly suitable for the washing of oil-stained textiles and working apparel in laundries. Liquid concentrates which can be automatically metered are particularly valuable for an application such as this. In addition to the properties mentioned, liquid concentrates are virtually unaffected in their viscosity behavior by variations in temperature.
Known pourable concentrates used for purposes of the type in question typically contain solvents, more particularly low molecular weight alcohols, to guarantee the necessary low-temperature stability. In many cases, low molecular weight polyglycols or polypropylene glycol are added to them to improve not only their low-temperature stability, but also their viscosity behavior in the required manner. However, neither addition makes any contribution to the washing effect.
Accordingly, the problem addressed by the present invention was to provide a corresponding liquid concentrate which, despite no additions of solvent, would be stable over a relatively wide temperature range and which would be easy to meter at various temperatures without significant changes in viscosity. At the same time, the washing and cleaning properties, particularly with respect to oil- and grease-containing soil, would not be reduced by comparison with known leading products, but instead would be fully maintained or even increased. This problem has been solved by the invention described in detail hereinafter,
DESCRIPTION OF THE INVENTION
The present invention relates to a liquid nonionic surfactant combination having improved low-temperature stability which contains linear C.sub.12-5 alcohols containing on average 2 to 7 ethylene oxide groups (EO), C.sub.12-15 alcohols containing an average of 3 to 7 ethylene oxide groups (EO) and 2 to 8 propylene oxide groups (PO), primary, linear and 2-methyl-branched C.sub.12-15 alcohols (oxoalcohols) containing an average of 2 to 8 ethylene oxide groups.
All the degrees of alkoxylation mentioned are statistical mean values which may be a whole or broken number for a special product. Preferred alcohol alkoxylates (a) and (b) are the narrow-range ethoxylates (nre). Alcohol alkoxylates (b), in which the propylene oxide distribution also corresponds to a narrow-range homolog distribution, are particularly preferred.
The nonionic component (a) preferably consists of an alcohol ethoxylate derived from primary, saturated and linear alcohols containing 12 to 14 carbon atoms, for example of the type present in alcohol mixtures synthesized by the Ziegler method or obtained from native fatty acids by reduction. The preferred alcohol mixtures of native origin may contain small amounts of C.sub.10 or C.sub.16 alcohols, although the percentage content of C.sub.16 alcohols should be less than 10% by weight and, more particularly, less than 5% by weight while the percentage content of C.sub.10 alcohol should be less than 15% by weight and, more particularly, less than 10% by weight. The degree of ethoxylation (EO) of the nonionic component (a) is preferably 2 to 5. The surfactant combination preferably contains 20 to 45% by weight and, more preferably, 25 to 40% by weight of component (a).
The nonionic component (b) is derived from primary saturated alcohols containing 12 to 15 carbon atoms in which the alcohol radical may be linear or methyl-branched in the 2-position or may contain mixed linear and methyl-branched radicals such as are typically present in oxoalcohol radicals. However, linear radicals of C.sub.12-14 alcohols of native origin, which may optionally contain corresponding amounts of C.sub.10 and C.sub.16 alcohol radicals, are prefer
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Kuhlmann Werner
Merz Thomas
Shamayeli Khalil
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
Hertzog A.
Jaeschke Wayne C.
Lieberman Paul
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