Organic compounds -- part of the class 532-570 series – Organic compounds – Fatty compounds having an acid moiety which contains the...
Patent
1993-02-16
1993-12-28
Prescott, Arthur C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Fatty compounds having an acid moiety which contains the...
554 71, 554 73, 554 75, 554157, 528935, C07C 5100, C07C 53126, C07C 5141
Patent
active
052741443
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a process for the production of solid, neutral or basic metal soaps by a controlled solid/liquid reaction of liquid fatty acids with solid metal oxides and/or metal hydroxides in an external premixing zone under reduced pressure and to the use of the metal salts as a stabilizer and/or lubricant mixture in the processing of plastics.
BACKGROUND OF THE INVENTION
It is known that metal soaps are produced either by the melt process, in which the molten fatty acid is reacted with metal oxides, hydroxides and/or suitable metal salts, or by the precipitation process in which their sodium soaps are subjected to double decomposition with water-soluble salts of the corresponding metals. The precipitation process generally gives very clean and voluminous products which can be processed at temperatures below 100.degree. C. However, filtration and drying costs make it much more expensive than the melt process.
Stabilizers produced by the melt process are satisfactory in purity and color for many industrial applications, for example as stabilizers in the processing of plastics. For example, the lead, barium and cadmium compounds have been successfully used in practice as such stabilizers. However, these substances have a highly toxic effect, particularly when they are present in powder form. Dust emission, particularly during processing, is a particular hazard to manufacturers of powder-form stabilizers because the powder-form metal soaps are taken up by the respiratory system and are able to develop their toxic effect therein.
RELATED ART
For these reasons, melt processes are described in DE-PS 15 44 697 and DE-PS 17 94 429 which, to prevent dust emission, claim a stabilizer/lubricant combination consisting of a mixture--combined in the melt--of a purely organic component suitable as lubricant, for example an ester of wax acids and higher aliphatic alcohols, paraffins or fatty alcohols, a suitable metal soap, a long-chain aliphatic carboxylic acid or basic lead salts of inorganic or organic acids. DE-PS 15 45 697 in particular describes a process for the production of these dust-free stabilizer/lubricant combinations, in which the toxic, insoluble dust-form stabilizers are dispersed in melts of the lubricants or in molten mixtures of stabilizers and lubricants and are converted into the solid state either on a flake-forming roller or by simple discharge into pans. The powder-form toxic stabilizers are completely enveloped in the non-toxic lubricants by this process. They are present in solid form and are completely dust-free because the lubricants naturally have considerably better adhesion than the powder-form stabilizers.
In addition, EP-A 163 395 and GB-A 2,113,521 describe processes for the production of animals feeds in which liquid or molten fatty acids are reacted with calcium oxide or calcium hydroxide in the presence of proteins and carbohydrates. However, these processes are very expensive on equipment because the reaction mixture, which evidently does not react off completely, has to be spread out on an endless belt or the like for after-reaction and drying. The calcium soaps obtained in this process would appear to be difficult to convert into free-flowing particles without the additives mentioned above, such as proteins or carbohydrates.
Finally, applicants' DE-OS 38 06 192 describes a process for the production of powder-form basic metal soaps, in which powder-form fatty acids are reacted with powder-form metal oxides or metal oxide mixtures in the presence of water or an acid as catalyst at temperatures from ambient temperature to 100.degree. C., optionally under reduced pressure, the reaction mixture having to be present throughout the reaction in the form of discrete free-flowing particles.
Now, the problem addressed by the present invention was to provide an improved process for the production of powder-form, neutral or basic metal soaps which would provide for dust-free, environmentally safe introduction of the solid metal oxide or metal hydroxi
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Duerr Gottfried
Liebs Harald
Scheck Hans
Wollmann Josef
Wuest Willi
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Prescott Arthur C.
Szoke Ernest G.
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