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AssigneeHenkel Kommanditgesselschaft auf Aktien
InventorsWolfgang Breuer, Volker Bauer, Joerg Poethkow, Beatrix Kottwitz, Jochen Jacobs, Hans Dolhaine, Wolfgang Seiter, Birgit Stevermann, Horst Upadek
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The invention relates to sodium silicates with a modulus (molar ratio of SiO.sub.2 to Na.sub.2 O) of 1.3 to 4 in the form of a fine-particle solid in shard-like form or compounds containing these silicates with the ability to reduce incrustation when used as a builder component in detergents. These useful materials are distinguished in particular by the fact that they are in the form of an X-ray amorphous overdried material (primary drying product) with water contents below 15% by weight and apparent densities of the non-compacted solid granules of 500 g/l or lower which has been produced by drying of a water-containing sodium silicate preparation using a hot gas phase as the drying medium and/or by heating of a spray-dried sodium silicate with water contents of at least 15% by weight at temperatures of 120.degree.to 450.degree. C., if necessary accompanied or followed by the application of forces to produce the shard-like structure. The invention also relates to multicomponent mixtures from the field of solid detergents or multicomponent compounds suitable for this field of application which are characterized by the presence of the sodium silicates defined above.
Sodium silicates having a molar ratio of SiO.sub.2 to Na.sub.2 O of 1.3 to 4 in the form of an absorbent, fine-particle solid in shard form having the property of reducing incrustation when used as a builder component In a detergent composition, said sodium silicates further being in the form of an X-ray amorphous overdried material with a water content below 15% by weight and having an apparent density of 500 g/l or lower which has been produced by drying of a water-containing sodium silicate composition using a hot gas phase as the drying medium or by heating of a spray-dried sodium silicate having a water content of at least 15% by weight at a temperature of 120.degree. C. to 450.degree. C., accompanied or followed by the application of forces to the sodium silicates to produce the shard structure, said sodium silicates having a specific BET surface of at least 5 M.sup.2 /g, and a cumulative volume of at least 100 mm.sup.3 /g.
The process of producing sodium silicates having a molar ratio of SiO.sub.2, to Na.sub.2 O of 1.3 to 4 in the form of an absorbent, fine-particle solid in shard form, comprising drying a water-containing sodium silicate composition with a hot gas phase as the drying medium or by heating a spray-dried sodium silicate composition having a water content of at least 15% by weight at a temperature of 120.degree. C. to 450.degree. C. to provide an X-ray amorphous overdried material having a water content below 15% by weight and an apparent density of 500 g/l or lower. and simultaneously or subsequently applying force to said sodium silicates to produce the shard form and wherein said sodium silicates have a specific BET surface of at least 5 m.sup.2 /g and a cumulative volume of at least 100 mm.sup.3 g.
A detergent composition containing sodium silicates having a molar ratio of SiO.sub.2 to Na.sub.2 O of 1.3 to 4 in the form of an absorbent, fine-particle solid in shard form having the property of reducing incrustation, said sodium silicates further being in the form of an X-ray amorphous overdried material with a water content below 15% by weight and having an apparent density of 500 g/l or lower which has been produced by drying of a water-containing sodium silicate composition using a hot gas phase as the drying medium or by heating of a spray-dried sodium silicate having a water content of at least 15% by weight at a temperature of 120.degree. C. to 450.degree. C., accompanied or followed by the application of forces to the sodium silicates to produce the shard structure and wherein said sodium silicates have a specific BET surface of at least 5 m.sup.2 /g, and a cumulative volume of at least 100 mm.sup.3 /g.
Dependencies are inferred from the claim text.