Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-09-13
1998-12-29
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510441, 510446, 510477, 510478, C11D 1100
Patent
active
058541896
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
Machine dishwashing generally consists of a prerinse cycle, a main wash cycle, one or more intermediate rinse cycles, a clear rinse cycle and a drying cycle. This applies in principle both to domestic dishwashing machines and to institutional dishwashing machines.
2. Discussion of Related Art
Machine dishwashing detergents can be formulated as liquids, pastes, powders and tablets. Tablet-form machine dishwashing detergents are becoming increasingly more popular because they are easy to handle. Several production processes leading to tablets with controllable dissolving behavior have already been described. These tablets are often positioned in the machine itself rather than in the detergent dispensing compartment in the door which enables the tablets to be dissolved to a certain extent in the prerinse cycle so that the effect of the generally additive-free tap water is chemically supported even in this early phase. Thus, DE 35 41 145, for example, describes alkaline machine dishwashing detergent tablets of uniform composition which have a broad solubility profile and which contain a mixture of sodium metasilicate monohydrate and anhydrous metasilicate and also anhydrous pentasodium triphosphate and, optionally, other constituents. DE 41 21 307 describes stable, bifunctional, phosphate- and metasilicate-free low-alkali machine dishwashing detergent tablets of which the builder components are partly used in water-free form and, during the production process, are sprayed with water which guarantees the required solubility profile and provides for favorable tabletting behavior.
In all known cases, the mixture to be tabletted is produced either with components having a high water of crystallization content, which readily give off their water of crystallization during tabletting, or by addition of free water to water-free components to anhydrize their surfaces. The resulting slight moisture content facilitates agglomeration and ensures good tabletting behavior.
However, since the water in the known tablets is present in completely or partly free form, the incorporation of water-sensitive or rather moisture-sensitive components was possible to only a limited extent, if at all. These components include inter alia bleaching systems based on per compounds and bleach activators, enzymes or even certain corrosion inhibitors.
Accordingly, the problem addressed by the present invention was to provide a process which would not only lead to break-resistant and storable, multifunctional tablets, but--in particular--would also enable water-sensitive or moisture-sensitive components of known detergent tablets to be incorporated and would avoid any deterioration therein during production and storage.
DESCRIPTION OF THE INVENTION
It has now been found that break-resistant and storable, multifunctional detergent tablets can be obtained providing the production process is carried out without the addition of free water and without the use of compounds which readily eliminate water of hydration and providing the powder-form or crystalline components of the detergent mixture are hydrophobicized individually and/or as mutually compatible powder-form or optionally granulated mixtures, are optionally mixed together again, other hydrophobicized or even non-hydrophobicized constituents are added and the resulting mixture is tabletted.
Accordingly, the present invention relates to break-resistant and storable, multifunctional detergent tablets of any composition, the powder-form or crystalline components used in water-free form or with a low degree of hydration being coated with a hydrophobicizing compound either individually or in the form of mutually compatible powder-form or optionally granulated mixtures. In addition, the powder-form or crystalline components may contain other moisture-sensitive components, optionally with their own hydrophobicizing coating.
The detergent tablets according to the present invention may have a high degree of alkalinity with pH values above 11 or
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Jacobs Jochen
Jeschke Peter
Kruse Hans
Douyon Lorna M.
Grandmaison Real J.
Jaeschke Wayne C.
Lieberman Paul
Szoke Ernest G.
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