Process of preparing a concentrated water-based liquid detergent

Details Process of preparing a concentrated water-based liquid detergent Process of preparing a concentrated water-based liquid detergent

1994-04-15

1995-09-19

Lieberman, Paul

Compositions

Dust suppressants for bulk materials, or processes of...

252122, 252173, 25217412, 25217417, 25217421, 252550, 252554, 252DIG14, C11D 1100, C11D 183, C11D 320

Patent

active

054513367

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



FIELD OF THE INVENTION

This invention relates to a homogeneous, concentrated water-based liquid detergent, to a process for its production and to its use for the manual and machine washing of fabrics.
Water-based liquid detergents which contain a mixture of anionic and typical nonionic surfactants and in which the nonionic surfactant content, based on the liquid detergent as a whole, is 20% by weight or more, generally lack homogeneity to the extent that the liquid detergent undergoes phase separation, for example separation into two clear liquid phases or the flocculation of a solid. This phase separation either occurs directly during production, during storage for several weeks (inadequate stability in storage) or on dilution with water. Another disadvantage is that liquid detergents of this type often show such high viscosities that they can no longer flow without the application of external shear forces.
It has now been found that it is possible to produce concentrated water-based liquid detergents containing at least 20% by weight of nonionic surfactants which do not have any of the disadvantages mentioned above.


DESCRIPTION OF THE INVENTION

In a first embodiment, therefore, the present invention relates to a concentrated water-based liquid detergent containing 30 to 60% by weight of anionic and nonionic surfactants, with the proviso that the nonionic surfactant content of the detergent is 20 to 35% by weight, based on the detergent as a whole, and the detergent contains monohydric and/or polyhydric alcohols containing 1 to 6 carbon atoms in quantities of 5 to 20% by weight, based on the detergent as a whole, as organic solvents and flows under the sole effect of gravity without any need for other shear forces to be applied.
The concentrated water-based liquid detergents preferably contain at least 35% by weight and more preferably between 40 and 60% by weight and, with particular advantage, between 45 and 58% by weight of surfactants. The detergents are homogeneous, stable in storage (stability test over at least 3 months both at room temperature and at extremely low temperatures of 5.degree. C. and 40.degree. C.) and do not undergo phase separation, even on dilution with water. They may be used manually and in machines either in concentrated form or, if required by the consumer, in dilute form. Thus, the consumer may either use the concentrated detergent directly in a quantity smaller than the quantity required in the case of commercial non-concentrated liquid detergents or, alternatively, may transfer the concentrated detergent to a bottle of larger volume, for example with twice the volume, fill up the bottle with water to the required dilution of the detergent and use the now dilute detergent, which is also stable in storage, in the quantities in which conventional, non-concentrated water-based liquid detergents are normally used. The liquid concentrates are preferably mixed with water in a ratio of 1:2 to 1:1. In machine washing, the concentrated liquid detergent is dispensed either via the dispensing compartment of the washing machine or via a commercial, external dispenser, for example in the form of a dispensing ball.
The nonionic surfactant content of the detergent is preferably 22 to 32% by weight and more preferably 25 to 30% by weight. The nonionic surfactants used are preferably adducts of on average 1 to 10 moles of ethylene oxide with primary C.sub.12-18 fatty alcohols and mixtures thereof, such as coconut oil fatty alcohol, tallow fatty alcohol or oleyl alcohol, or with primary alcohols (oxoalcohols) methyl-branched in the 2-position. Particularly suitable adducts are C.sub.12-14 alcohols . 3 EO or 4 EO, C.sub.13-15 alcohols . 3, 5 or 7 EO, C.sub.12-18 alcohols . 3, 5 or 7 EO and mixtures thereof, such as mixtures of C.sub.12-14 alcohol . 3 EO and C.sub.12-18 alcohol . 5 EO. The concentrated liquid detergents preferably contain 21 to 30% by weight and, more particularly, 22 to 28% by weight of ethoxylated nonionic surfactants. The detergents preferab

REFERENCES:
patent: 4490285 (1984-12-01), Kebanli
patent: 4595526 (1986-06-01), Lai
patent: 5271860 (1993-12-01), Schwadtke et al.

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