Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1997-08-11
1999-09-07
Douyon, Lorna
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510276, 510351, 510356, 510452, 510507, 510509, 8137, C11D 1700, C11D 310, D06L 100
Patent
active
059487470
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a spray-dried detergent or to a component therefor, the spray-dried detergent or the component therefor showing favorable dispensing behavior and favorable solubility behavior. The present invention also relates to a washing process in which the spray-dried detergent is dispensed from a dispensing compartment into a commercial washing machine.
2. Discussion of Related Art
Nonionic surfactants are known to exhibit very high cleaning power which makes them particularly suitable for use at washing temperatures of 60.degree. C. or lower. Depending on their hydrophilicity, however, nonionic surfactants can only be processed by spray drying in certain quantities because, otherwise, excessive pluming occurs in the waste air of the spray drying towers and the spray-dried powder is left with unsatisfactory flow properties. In addition, when incorporated in the slurry, they undesirably increase its viscosity where anionic surfactants are simultaneously present. Accordingly, processes have been developed in which the liquid or molten nonionic surfactant is mixed with the particles spray-dried beforehand or is sprayed onto a carrier substance. According to European patent application EP-A-0 360 330, for example, mixtures of nonionic surfactants and fatty acids are spayed onto a spray-dried basic powder which contains phosphates and the spray-dried pal particles thus treated are processed with such substances as carbonate.
Spray-dried carrier particles aftertreated with nonionic surfactants are known, for example, from European patent application EP-A-0 149 264 and from German patent applications DE-A-34 44 960, DE-A-35 45 947 and DE-A-39 36 405.
Unfortunately, the described process variants lead to powders which either show favorable dispensing behavior or favorable dissolving behavior or which exhibit neither favorable dissolving behavior nor favorable dispensing behavior.
Accordingly, the problem addressed by the present invention was to provide a spray-dried detergent which would show both favorable dispensing behavior and favorable dissolving behavior.
DESCRIPTION OF THE INVENTION
In a first embodiment, therefore, the present invention relates to a spray-dried detergent or a component therefor containing anionic surfactants, inorganic builders and other ingredients of detergents, the detergent containing substance) from the group of carbonates, hydrogen carbonates and silicate-containing builders, that the spray-dried particles are aftertreated with nonionic surfactants.
The quantities a) to e) are based on the non-aftertreated spray-dried particles unless otherwise stated in the specification.
Surprisingly, excellent dispensing and dissolving properties are obtained for spray-dried components of the type in question although they are aftertreated solely with nonionic surfactants and not--as described in EP-A-0360 330--with mixtures of nonionic surfactants and fatty acids.
In one particular embodiment, the present invention relates to spray-dried detergents or components therefor in which the ratio by weight of the spray-dried particles to the nonionic surfactant is from 10:1 to 25:1 and, more particularly, from 12:1 to 20:1.
In another preferred embodiment of the present invention, the detergents contain at least one silicate-based builder, more particularly alumosilicates and/or amorphous sodium and/or potassium silicates, as the inorganic builder c). Advantageously, the detergents contain at least one silicate-based builder in combination with sodium and/or potassium carbonate.
Suitable alumosilicates are, in particular, finely crystalline, synthetic zeolites containing bound water, such as detergent-quality zeolite A. However, zeolite X and zeolite P and mixtures of zeolite A, X and/or P may also be used. The zeolite may be employed in the form of a spray-dried powder or even in the form of an undried, stabilized suspension still moist from its production. Where the zeolite is used in the form of a suspension, the suspension ma
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Freese Hubert
Linke Wolfram
Schambil Fred
Douyon Lorna
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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