Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1996-08-22
1998-08-25
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510309, 510315, 510320, 510323, 510507, 510509, 510511, 510531, 510532, C11D 1700, C11D 308, C11D 310, C11D 312
Patent
active
057983283
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a detergent which contains amorphous silicate-based builders and which shows both excellent primary and secondary washing properties.
2. Discussion of Related Art
It is known from the prior art that the performance of detergents can be enhanced by the use of carbonates and silicates. Thus, International patent application WO-A-93/14182 describes the subsequent addition of both carbonates and silicates to basic detergent granules. However, other applications disclose the production and use of carbonate/silicate compounds in detergents. These applications include, for example, European patent application EP-A-0 267 042 and British patent application GB-A-1,595,770, according to the teaching of which spray-dried carbonate/silicate compounds are used as carriers for nonionic surfactants in detergents.
Carbonate/silicate compounds which may be used as a substitute for conventional builders, such as zeolite, and for newer builders, such as crystalline layer-form sodium silicates, have also recently been described in the literature. They include the compounds according to European patent applications EP-A-0 486 078, EP-A-0 486 079, EP-A-0 488 868 or EP-A-0 561 656 which have been arbitrarily selected from the existing prior art and which have been cited purely by way of example.
However, it has now surprisingly been found that not only can carbonate/silicate compounds of the type in question be used as a replacement or partial replacement for zeolites and/or crystalline layer-form sodium silicates to inhibit incrustation, improvements in primary washing power and in the inhibition of redeposition can also be achieved by using carbonate/silicate compounds which do not have a uniform surface or a uniform particle size distribution.
DESCRIPTION OF THE INVENTION
Accordingly, the present invention relates to a detergent containing surfactants from the group of anionic, nonionic, cationic, amphoteric and zwitterionic surfactants, silicate-based builders and carbonates and, optionally, other ingredients of detergents, the detergent containing amorphous alkali metal silicates and alkali metal carbonates in the form of a compound which consists of about 40 to 80% by weight of alkali metal carbonate, about 10 to 40% by weight of alkali metal silicate, with the proviso that the alkali metal carbonate content is always greater than the alkali metal silicate content, and at most 25% by weight of water and which has neither a homogeneous surface nor a uniform particle size distribution.
In the context of the invention, "alkali metal carbonates" are also understood to include bicarbonates, although the use of dialkali metal carbonates is preferred. Sodium carbonate, potassium carbonate or mixtures thereof are particularly preferred, sodium carbonate generally being used.
The preferred amorphous alkali metal silicates include, above all, sodium silicates with a molar Na.sub.2 O:SiO.sub.2 ratio of 1:1 to 1:3.5, molar ratios of 1:2 to 1:3 being particularly preferred. Compounds containing disilicates have proved to be particularly advantageous.
The compounds may be produced by any process which enables inhomogeneous surfaces and particle size distributions to be generated. For example, the compounds may be spray-dried and/or granulated and then partly size-reduced. Equally, mixtures of carbonates and silicates or even already spray-dried and/or granulated compounds may be roll-compacted or extruded, the strand issuing from the extrusion die being cut up, optionally after drying and/or cooling. The extrudates obtained are not subsequently spheronized in order not to destroy the inhomogeneity of the surface, which--macroscopically--is also distinguished by a certain roughness, or the particle size distribution. Preferred compounds consist partly of substantially spherical granules while other parts may be cylindrical and/or splinter-like with sharp edges and corners. The size of individual particles lies within a broad range. In a preferred embodimen
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English translation of EP 0 488 868, published Jun. 3, 1992, Feb. 1998.
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Kottwitz Beatrix
Poethkow Joerg
Upadek Horst
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Hertzog Ardith
Jaeschke Wayne C.
Szoke Ernest G.
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