Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-04-18
1999-07-27
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510403, 510404, 510421, 510422, 510424, 510425, 510430, C11D 1708
Patent
active
059290145
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to pseudoplastic paste-form detergents, more particularly for automatic dispensing in institutional washing machines, to a process for dispensing these pseudoplastic detergents, to a process for their production and to stable, free-flowing surfactant mixtures specially adapted to the production process which contain nonionic surfactant, a long-chain carboxylic acid or salt thereof and optionally synthetic anionic surfactant.
RELATED ART
Liquid to paste-form detergents have become known in large numbers, particularly over recent years. They are generally adapted to domestic requirements so that, normally, they have to be sufficiently fluid to be able to be poured out and dispensed without difficulty. Since, in addition, liquid detergents of the type in question have to be stable in storage over relatively wide temperature ranges without losing their liquid properties, it is often necessary to add organic solvents and/or hydrotropes which do not themselves make any contribution to the washing or cleaning result and are therefore undesirable. One method of avoiding possible dispensing problems with detergents showing inadequate flowability is proposed in European patent application EP 253 151 A2. This document describes liquid and, in some cases, highly viscous detergents based on nonionic and anionic surfactants which contain polyethylene glycol as hydrotrope and which are packed in portions in bags of a water-soluble material.
The paste-form detergent proposed in DE 37 19 906 A1 consists of a phase formed from nonionic surfactant which is liquid at temperatures below 10.degree. C. and--dispersed therein--a solid phase with a certain particle size which is formed from washing alkalis, sequestering agents and optionally anionic surfactants. The surfactants or mixtures used have pour points (solidification points) below 5.degree. C. to ensure that the paste does not solidify at low transport and storage temperatures. This detergent paste for institutional laundries has such good flow properties that it can be transported through a suction pipe by a conventional feed pump which is undoubtedly an advantage. However, it has now been found that, during their production, the pastes in question cannot always satisfactorily guarantee the homogeneity of their mixed ingredients and often tend to separate, even in storage. This negative property involves not only the separation of the solid constituents from the liquid constituents, but also the phase separation of the liquid constituents. This disadvantage is particularly noticeable when the pastes stored in storage containers are exposed to shear forces. Thus, although the viscosity of known pastes can be reduced by shearing, which makes them even easier to pump and dispense, phase separation of the already sheared, but as yet unpumped paste in the storage container generally cannot be avoided. Accordingly, there was a need even more effectively to prevent separation of the paste ingredients both during production and during shearing under removal conditions from the transport or storage container and further to increase the stability of the detergent paste in storage.
BRIEF DESCRIPTION OF THE INVENTION
Surprisingly, this has largely been achieved by modifying the viscosity and pseudoplasticity of the paste. The paste-form detergents according to the invention have such a high viscosity at room temperature (20.degree. C. to 25.degree. C.) in the absence of shear forces that they are unable to flow out from containers or to be transported simply under the effect of suction. Even the shearing effect of a displaceable plate or a plunger of the type provided in the metering or dispensing system according to DE-OS 37 19 906 A1 is by no means sufficient to reduce the viscosity of the paste-form detergents according to the invention to such an extent that they can be transported by a suction pump. Only relatively powerful shear forces of the magnitude generated, for example, by the paste container and dispenser according t
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Amberg Guenther
Beaujean Hans-Josef
Harth Hubert
Holderbaum Thomas
Holz Erich
Henkel-Ecolab GmbH & Co. OHG
Jaeschke Wayne C.
Lieberman Paul
Ogden Necholus
Ortiz Daniel S.
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