| 摘要 |
<p>This invention is directed to a water-in-oil emulsion comprising a self-inverting water-in-oil emulsion of a water-soluble polymer containing an N,N-dialkyl amide of the formula: < IMG > wherein R is alkyl, alkenyl, cycloalkyl, aryl, or inertly substituted alkyl, alkenyl, cycloalkyl, or aryl and each R' is independently an alkyl, said N,N-dialkyl amide being employed in an amount sufficient to improve the low temperature properties of the emulsion. The low temperature properties are the stability of the emulsion upon repeated freeze-thaw cycles and/or the fluidity of the emulsion at low temperatures such as -20.degree.C. 37</p> |
