Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
1999-12-10
2002-01-22
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S418000, C510S421000, C510S423000, C510S424000, C510S432000, C510S466000, C510S499000, C252S301500, C252S391000, C252S391000, C252S391000, C516S055000, C516S057000, C516S058000
Reexamination Certificate
active
06340662
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a paraffin- and/or silicone-based foam regulator system in the form of an aqueous emulsion, to its use for the production of particulate foam regulators and to a process for their production.
2. Discussion of Related Art
The foam-regulating effect of combinations of paraffins with bis-fatty acid amides in aqueous surfactant-containing systems is known. Thus, European patent EP 0 309 931 B1, for example, describes particulate foam regulators suitable for use in detergents which consist of a water-soluble surfactant-free carrier material and—adsorbed thereto—a siloxane-free defoamer mixture of 5 to 60% by weight of soft and/or hard paraffin, 20 to 90% by weight of microcrystalline paraffin wax with a certain melting range and 5 to 20% by weight of a fine-particle diamide derived from C
2-7
diamines and C
12-22
fatty acids. These particulate foam regulators are produced by spray drying of an aqueous slurry containing the carrier material and the defoamer mixture. The defoaming performance of the defoamer mixture is said to be unsatisfactory when it is sprayed onto a particulate detergent.
The use of foam-regulating homogeneous mixtures of nonionic surfactant and a foam regulator system containing paraffin wax and bis-fatty acid amides for improving the production and properties of extruded detergents is known from International patent application WO 96/126258.
DE-OS 23 38 468 relates to a detergent containing a silicone defoamer which is protected against interaction with the detergent ingredients. For its production, aqueous melts containing the silicone defoamer and a carrier material, for example polyglycol, are first spray-dried and the particles obtained are provided with a coating in a fluidized bed of a solid water-soluble shell-forming material. Salts typically used in detergents, more particularly tripolyphosphate or carboxymethyl cellulose, may be used as the coating material. A multistage production process such as this is comparatively expensive on equipment.
DE-OS 31 28 631 describes the production of foam-regulated detergents containing microencapsulated silicone defoamers. The silicone is dispersed in an aqueous solution of a film-forming polymer and the dispersion is delivered to the spray drying tower through a special pipe separately from the other detergent ingredients dissolved or dispersed in water. The two streams are combined in the vicinity of the spray nozzle. Suitable film-forming polymers are, for example, cellulose ethers, starch ethers or synthetic water-soluble polymers and mixtures thereof. The microcapsules are formed spontaneously in the spray nozzle or by preliminary precipitation through the addition of electrolyte salts to the silicone dispersion. The described process is obviously confined to the production of spray-dried detergents and cannot be applied to detergents produced otherwise, for example by granulation, or even to other fields of application.
European patent application EP 097 867 describes a process for the production of microencapsulated defoamer oils by mixing a silicone emulsion with an aqueous solution of carboxymethyl cellulose and precipitating the microcapsules by addition of electrolytes, more particularly polyvalent salts or organic solvents. Considerable difficulties are involved in uniformly distributing the small quantities of silicone microcapsules required for adequate foam suppression in a comparatively large quantity of washing powder.
DE-OS 34 36 194 describes a process for the production of pourable defoamer granules by spray drying of an aqueous defoamer dispersion containing film-forming polymers. To produce granules consisting of 1 to 10% by weight of water-insoluble defoamer, 0.2 to 2% by weight of a mixture of sodium carboxymethyl cellulose and methyl cellulose in a ratio by weight of 80:20 to 40:60, 70 to 90% by weight of inorganic water-soluble or water-dispersible carrier salts, rest water, an aqueous solution containing 0.5 to 8% by weight of the cellulose ether mixture is allowed to swell at a temperature of 15 to 60° C. until the viscosity of the solution is at least 75% of the viscosity of the fully swollen cellulose ether solution, after which the actual defoamer is dispersed in this solution and, after addition of the carrier salts and optionally water, the homogenized dispersion is spray-dried. Organopolysiloxanes, paraffins and mixtures of organopolysiloxanes and paraffins are used as the active defoamers. The active defoamer content is between 1 and 10% by weight and preferably between 3 and 7% by weight. The carrier salt preferably consists of a mixture of sodium silicate, sodium tripolyphosphate and sodium sulfate.
European patent EP 0 337 523 B1 describes a process for the production of powder-form detergents containing at least 5% by weight of anionic surfactant, 20 to 80% by weight of alumosilicate and paraffin wax substantially insoluble in water and anionic and nonionic surfactants which comprises the co-spraying or subsequent spraying of the paraffin onto the preformed detergent particles as a key process step. The paraffin wax may even be used in the form of a mixture with nonionic surfactants.
The variant disclosed in EP 0 337 523 B1, where the paraffin is sprayed onto a preformed powder-form detergent, can only be applied with difficulty if it is desired to use the paraffin wax in combination with a bis-fatty acid amide known to enhance its foam-regulating effect rather than on its own. Bis-fatty acid amides are generally solid at room temperature and have a relatively high melting point, so that they—or their combination with the paraffin—can only be handled in liquid and sprayable form at elevated temperatures of, for example, around 140° C. If the temperature falls below that limit, the pipes and nozzles used are in danger of being blocked through the solidification of the bis-fatty acid amide. Another disadvantage is that the high temperatures of the material sprayed on can cause unwanted interactions with the heat-sensitive ingredients of the detergent. In addition, uniform distribution of the foam regulator system in the detergent is jeopardized if, after spraying on as an extremely hot material, it cools down rapidly after impinging on the detergent powder.
The problem addressed by the present invention was principally to develop a liquid formulation of a foam regulator system containing silicone oil and/or paraffin and bis-fatty acid amide which would have a low viscosity, which could be handled at low temperatures and which would have a low percentage content of non-foam-regulating ingredients. In addition, only a slight reduction in defoaming performance would occur both during production and in storage and during the ultimate further processing of the liquid composition to particulate products.
DESCRIPTION OF THE INVENTION
The present invention, which solves this problem, relates to an aqueous foam regulator emulsion containing 16% by weight to 70% by weight of active foam regulator based on paraffin wax and/or silicone oil, 2% by weight to 15% by weight of nonionic and/or anionic emulsifier and no more than 80% by weight of water. A paraffin wax base in the context of the present invention is understood in particular to be a combination of paraffin wax and bis-fatty acid amide. A foam regulator emulsion according to the invention preferably contains 15% by weight to 60% by weight and, more particularly, 30% by weight to 50% by weight of paraffin wax or a mixture of paraffin wax and silicone oil, 1% by weight to 10% by weight and, more particularly, 3% by weight to 8% by weight of bis-fatty acid amide derived from C
2-7
diamines and C
12-22
fatty acids, 2% by weight to 15% by weight and, more particularly, 3% by weight to 10% by weight of nonionic and/or anionic emulsifier and no more than 80% by weight, preferably no more than 60% by weight and, in particularly preferred embodiment, 20% by weight to 50% by weight of water.
The present invention also relates to the use of such emulsions for
Artiga González Rene-Andres
Gassenmeier Thomas
Hammerstein Stefan
Kraus Ingrid
Liphard Maria
Delcotto Gregory
Henkel Kommanditgesellschaft Auf Aktien (KGaA)
Jaeschke Wayne C.
Murphy Glenn E. J.
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