Compositions – Fluent dielectric – N-containing
Patent
1994-01-24
1995-08-15
Lieberman, Paul
Compositions
Fluent dielectric
N-containing
25217423, 25217424, 25217421, 25217417, 252DIG2, 252DIG14, 252173, C11D 1122, C11D 337, C11D 112
Patent
active
054416728
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a homogeneous, concentrated water-containing liquid detergent and to its use for the manual and machine washing of fabrics.
2. Statement of Related Art
Liquid water-containing laundry detergents containing anionic and nonionic surfactants are well known, European patent application EP 367 049 (BASF) describes liquid detergents containing anionic and nonionic surfactants and a special partly esterified copolymer. These liquid detergents consist of clear, aqueous, generally alkaline solutions which are stable in storage and which have an improved primary and secondary washing effect compared with state-of-the-art detergents. The concentrated water-containing liquid detergents described in this document contain 10 to 30% by weight typical anionic surfactants and 5 to 20% By weight nonionic surfactants and 0.1 to 20% by weight partly esterified copolymer.
Water-containing liquid detergents which contain a mixture of anionic and nonionic surfactants and in which the content of nonionic surfactants, based on the liquid detergent as a whole, is more than 20% by weight generally have inhomogeneities which cause phase separation of the liquid detergent, for example separation into two clear liquid phases or the flocculation of a solid. This phase separation occurs either directly during production, during storage for several weeks (instability in storage) or on dilution with water.
It has now been found that concentrated aqueous liquid detergents having a nonionic surfactant content above 20% by weight do not have the disadvantages mentioned above providing they contain a certain surface-active sulfonate.
DESCRIPTION OF THE INVENTION
Accordingly, the present invention relates to a concentrated aqueous liquid detergent containing anionic and nonionic surfactants and a partly esterified copolymer, characterized in that it contains 8 to 25% by weight of a C.sub.12-18 alkane sulfonate, 21 to 32% by weight of an ethoxylated fatty alcohol, 5 to 20% by weight of the partly esterified copolymer and optionally 1 to 22% by weight other surfactants.
The concentrated water-containing liquid detergents preferably contain at least 35% by weight and, in particular, between 40 and 55% by weight surfactants. The detergents are homogeneous, stable in storage (stability tested both at room temperature and at extremely low temperatures of 5.degree. to 40.degree. C. over a period of at least 3 months) and show no tendency towards phase separation, even on dilution with water. They may be used manually and in machines either in concentrated form or, if desired by the consumer, in dilute form. Thus, the consumer may use the concentrate either directly and in a quantity smaller than the quantity in which commercially available non-concentrated liquid detergents are used or, alternatively, may transfer the concentrate to a bottle with a larger volume, for example twice the volume, may fill the bottle with water to the desired degree of dilution of the concentrate and then use the diluted detergent, which is also stable in storage, in the quantities in which conventional, non-concentrated water-containing liquid detergents have hitherto normally been used. The liquid concentrates are preferably diluted with water in a ratio of 1:2 to 1:1. In machine washing processes, the concentrated liquid detergents are either dispensed from the dispensing compartment of the washing machine or from a commercial external dispensing unit, for example a dispensing ball.
The readily biodegradable alkane sulfonates are obtained from C.sub.12-18 alkanes, for example by sulfochlorination or sulfoxidation with subsequent hydrolysis and neutralization. The sulfonate group is statistically distributed over the entire carbon chain, the secondary alkane sulfonates predominating. The concentrated water-containing liquid detergents preferably contain 8 to 20% by weight and, more preferably, 10 to 16% by weight alkane sulfonate.
Preferred ethoxylated fatty alcohols are adducts of 1 to 1
REFERENCES:
patent: 4411831 (1983-10-01), Robinson et al.
patent: 5008032 (1991-04-01), Diessel et al.
patent: 5179201 (1993-01-01), Oftring et al.
Schwadtke Karl
Sung Eric
Drach John E.
Fries Kery
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lieberman Paul
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