Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1993-07-14
1994-10-25
Reddick, Judy M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524312, 524314, 524315, 524318, 524378, 524755, 524757, C08K 510
Patent
active
053589882
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to water-in-oil emulsions containing an emulsion polymer soluble or swellable in water in an oil phase of limited miscibility with water, to a process for their production and to the use of the inverted emulsions as flocculants, sedimenting agents and/or as thickeners.
STATEMENT OF THE RELATED ART
Water-in-oil emulsions, above all with homopolymers and/or copolymers of acrylamide as emulsion polymer, have acquired a broad range of applications as high-solids liquid products of handlable viscosity by virtue of the invertibility of the emulsions and the possible production of aqueous polymer solutions. Particular significance is attributed to inverted emulsions such as these as flocculants and/or as thickeners in the treatment of communal and industrial wastewaters, where they bring about extensive separation of the solid phase from the liquid phase. Processes for the production of water-in-oil emulsions of high molecular weight compounds by polymerization of ethylenically unsaturated monomers dissolved in water in an oil phase are well known. The oil phase generally consists of inert hydrophobic liquids of the aromatic and/or chlorinated hydrocarbon type, such as mineral oil, kerosines, naphthas, toluene, xylene, o-dichlorobenzene, propylene dichloride and the like (cf. DE-A-10 89 173, DE-A-10 81 228, DE-C-21 54 081). The use of such emulsions as flocculants, for example in sewage treatment plants, involves increasing environmental risks insofar as the oil remains in the sludge to be disposed of. DE-A-33 02 069 describes preparations suitable as flocculants, in which the oil phase may optionally contain natural triglycerides and/or fatty acid monoesters in addition to the aromatic and/or halogenated hydrocarbons already described. EP 208 217 describes corresponding emulsions in which the oil phase contains up to 100% by weight, based on oil phase, of aliphatic dicarboxylic acid esters as ecologically sale flocculants. However, applicants' own investigations have shown that, above all, high percentage contents of acid esters in the oil phase can seriously disturb polymerization of the ethylenically unsaturated monomers so that the dispersions obtained become more unstable or the emulsion polymers obtained have comparatively lower molecular weights than usual. However, water-in-oil emulsions of which the polymers have high molecular weights and which therefore show greater effectiveness are preferred for practical applications.
DESCRIPTION OF THE INVENTION
Object of the Invention
Accordingly, the problem addressed by the present invention was to provide polymer-containing water-in-oil emulsions in which the polymers would have high molecular weights and in which the oil phase would be more readily biodegradable than the oil phases hitherto used.
Summary of the Invention
The present invention relates to water-in-oil emulsions of emulsion polymers dissolved in water and/or swellable in water in a liquid oil phase of limited miscibility with water in the presence of water-in-oil emulsifiers, characterized in that the oil phase at least partly contains monoether compounds, the monoether compounds having two identical or different hydrocarbon moieties with at least 5 C atoms linked by the ether oxygen.
DESCRIPTION OF PREFERRED EMBODIMENTS
In the context of the present invention, the expression "oil phase" is used simplistically for hydrophobic compounds or mixtures of various hydrophobic compounds which are present in the emulsion as a liquid phase. In principle, the oil phase has to meet certain requirements. Thus, the miscibility of the oil phase in water should be limited to such an extent that the oil phase forms a clear two-phase system with water. Accordingly, the oil phase of the emulsions according to the invention contains only small dissolved quantities of water, preferably below 0.3% by weight and more preferably below 0.1% by weight, as determined at 20.degree. C. and based on oil phase. In addition, the oil phase should be present in liquid
REFERENCES:
patent: 3624019 (1971-11-01), Anderson et al.
patent: 4581402 (1986-04-01), Dunk et al.
patent: 4792582 (1988-12-01), Hoefer et al.
patent: 4950709 (1990-08-01), Schlueter et al.
patent: 4981893 (1991-01-01), Hoefer et al.
patent: 5093411 (1992-03-01), Buter
Industrial Solvents Handbook, 3rd Edition, Noyes Data Corp, N.J. 1985, p. 381 (Article Unavailable).
D'Ans-Lax, Taschenbuch fur Chemiker und Physiker, 2nd vol. Organische Verbindungen, 4th Edition, Springer Verlag (1983) Article Unavailable).
Ullmann's Encyklopadie der technischen Chemie, 4th Edication (1977), vol. 14, Verlag Chemie, Weinheim, pp 591-593.
J. T. Davies (das Atlas-HLB-System, Atlas Chemie GmbH, EC10G Jul. 1971; HLB-System, Rompps Chemie-Lexikon, 8th Ed., p. 1715, Frankh'sche Verlagshandlung Stuttgart.
J. Reuter (Chemikier-Zeitung, vol. 98 (1974), No. 5, pp. 222-227).
Fischer Herbert
Jeschke Rainer
Kroke Hermann
Ploog Uwe
Schieferstein Ludwig
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Reddick Judy M.
Szoke Ernest G.
Wisdom, Jr. Norvell E.
LandOfFree
Water-in-oil emulsions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water-in-oil emulsions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-in-oil emulsions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-135910