Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Patent
1998-01-12
2000-03-07
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
510509, 510511, 510443, 510444, 510452, C11D 308, C11D 310, C11D 1100
Patent
active
060340509
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process for the production of a surfactant-containing amorphous alkali metal silicate/alkali metal carbonate compound with multiple wash cycle performance which may be used as a water-soluble builder in detergents or cleaners, to the use of such alkali metal silicate compounds in detergents or cleaners, to extruded detergents or cleaners and to a process for their production.
Modern compacted detergents or cleaners generally have the disadvantage that, on account of their compact structure, they exhibit poorer dissolving behavior in aqueous liquors than, for example, lighter spray-dried detergents or cleaners of the prior art. Detergents or cleaners generally tend to dissolve more slowly in water, the higher their degree of compaction. Because they are insoluble in water, the zeolites normally present as builders in detergents or cleaners can additionally contribute towards the impaired dissolving behavior.
A water-soluble alternative to zeolites are amorphous alkali metal silicates with multiple wash cycle performance.
2. Discussion of Related Art
It is known that powder-form hydrated water-soluble silicates still containing about 20% by weight of water can be obtained by the spray drying or roll drying of waterglass solutions (cf. Ullmanns Enzyclopadie der technischen Chemie, 4th Edition 1982, Vol. 21, page 412). Products of this type are commercially available for various purposes. Corresponding powders have a very loose structure as a result of spray drying. Their bulk densities are generally well below 700 g/l.
Granular alkali metal silicates with relatively high bulk densities can be obtained in accordance with the teaching of European patent application EP-A-0 526 978. In this process, an alkali metal silicate solution with a solids content of 30 to 53% by weight is introduced into a heated drum in the longitudinal axis of which rotates a shaft with a plurality of arms reaching almost to the inner surface of the drum, the drum wall having a temperature of 150 to 200.degree. C. The drying process is supported by a gas introduced into the drum at a temperature of 175 to about 250.degree. C. This process gives a product with an average particle size of 0.2 to 2 mm. A preferred drying gas is heated air.
European patent application EP-A-0 542 131 describes a process in which a product completely soluble in water at room temperature with a bulk density of 500 to 1200 g/l is obtained. Heated air is preferably used as the drying gas. This process also uses a cylindrical dryer with a heated wall (160 to 200.degree. C.) in the longitudinal axis of which a rotor with blade-like vanes rotates at such a speed that a pseudoplastic paste with a free water content of 5 to 12% by weight is formed from the silicate solution with its solids content of 40 to 60% by weight. Drying is supported by a hot air stream (220 to 260.degree. C.).
Earlier hitherto unpublished patent application P 44 19 745.4 also describes a water-soluble, amorphous and granular alkali metal silicate which is produced by a process similar to that described in EP-A-0 526 978, but contains silica. The term "amorphous" in this context means "X-ray amorphous". This means that the alkali metal silicates do not produce any sharp reflexes in X-ray diffraction patterns, but at best one or more broad maxima of which the width amounts to several degrees of the diffraction angle. However, this does not mean that regions producing sharp electron diffraction reflexes cannot be found in electron diffraction experiments. This may be interpreted to mean that the substance contains microcrystalline regions up to about 20 nm (max. 50 nm) in size.
Granular amorphous sodium silicates obtained by spray drying of aqueous waterglass solutions and subsequent grinding, compaction and spheronizing with additional drying of the ground material are the subject of U.S. Pat. Nos. 3,912,649, 3,956,467, 3,838,193 and 3,879,527. The products obtained have water contents of about 18 to 20% by weigh
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DIN ISO 787 (Feb. 1983).
Artiga Gonzalez Rene-Andres
Bauer Volker
Burmeister Katrin
Hammelstein Stefan
Garrett Dawn L.
Gupta Yogendra
Henkel Kommanditgesellschaft auf Aktien
J. Murphy Glenn E.
Jaeschke Wayne C.
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