Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1999-11-10
1994-03-01
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
26421111, 425311, 4253824, 425464, B29C 4712
Patent
active
052904962
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a process for the production of granules of a detergent, more particularly a laundry detergent, from a mixture of at least partly solid fine-particle ingredients.
In the field of fine-particle, solid and free-flowing domestic and institutional detergents, more particularly in the field of powder-form laundry detergents, there is a trend towards the manufacture both of products having increased apparent densities and of relatively highly concentrated mixtures of ingredients.
RELATED ART
Granules containing carriers and liquid or paste-form surfactants adsorbed therein, more particularly corresponding nonionic surfactants, are known from the relevant prior art literature. In the processes which have been developed for their production, the liquid or molten nonionic surfactant is sprayed onto a previously spray-dried powder or is mixed with a powder-form carrier under granulating conditions. Proposed carriers include loose, more particularly spray-dried, water-soluble detergent-range salts or salt mixtures, for example phosphates, silicates and/or perborates, and water-insoluble compounds, for example zeolites, bentonites and/or fine-particle silicon dioxide. Absorbent carrier granules of this type, which have been developed in particular for the adsorption of nonionic surfactants and which are generally produced by spray drying, are described, for example, in U.S. Pat. Nos. 3,849,327, 3,886,098, 3,830,027 and 4,269,722. U.S. Pat. No. 4,707,290 describes a granular adsorbent which is said to be capable of absorbing large quantities of liquid to paste-form detergent ingredients and which is produced by spray drying. It has been found in practice that products of this type can cause difficulties during the dispensing phase insofar as they do not dissolve completely and leave residues behind. Not only do the particles in question themselves show impaired dispensing behavior, they can also affect the solubility and dispensing behavior of the other powder-form detergent components. The result is that a basically readily dispensable powder mixture as a whole develops poor dispensing behavior if it additionally contains powder components of the type in question in the mixture. Further proposals of this nature can be found, for example, in DE 34 44 960-A1 and in EP 149 264.
All these proposals are relatively complicated. An aqueous slurry of the carrier is first prepared and then has to be converted by spray drying into a granular, porous intermediate product. In a second stage of the process, the carrier granules are sprayed with the liquid component, more particularly nonionic surfactant. The nonionic surfactant diffuses in with delay and adsorbates containing a high percentage of nonionic surfactants are only sufficiently free-flowing after a certain treatment and standing time. If, by contrast, powder-form intermediates are used, for example in the form of finely crystalline zeolites or crystalline water-soluble carrier salts, and if they are treated with liquid or molten nonionic surfactants under granulating conditions, the granules obtained generally show a very uneven particle size distribution and reduced flow properties. Above all, however, the absorption capacity of these granules for nonionic surfactants is comparatively limited if they are not to lose crucial properties, more particularly their free flow.
The present invention seeks on the one hand to provide solid, free-flowing granules of detergent ingredients which can be predetermined in regard to their particular shape and, at the same time, to enable distinctly increased apparent densities to be established. In addition and in conjunction therewith, however, the invention also seeks to address another problem area, more particularly from the field of storable, free-flowing detergents, especially laundry detergents. More particularly, the invention seeks to provide access to pourable free-flowing detergent concentrates which retain their flow properties, even in the event of storage over prolonged
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Carduck Franz-Josef
Jacobs Jochen
Pawelczyk Hubert
Raehse Wilfried
Davis Robert B.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Szoke Ernest G.
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