| abstract |
Water-soluble copolymers, the statistical distribution of 5 to 60 percent by weight of residues of formula I. 2 to 40% by weight of residues of the formula II and 38 to 93% by weight of residues of the formula III exist, as well as their derivatives obtainable by partial hydrolysis, where R¹ and R² are the same or different and What serstoff, methyl, ethyl or optionally together trimethylene, Y the rest -CO-NH-C (CH₃) ₂-CH₂- or a di right bond and X ⊕ is a cation, are produced by inverse emulsion polymerization. The copolymerisate emulsions obtained can be used with particular advantage as auxiliaries in the de-oiling of mineral oil-containing sand and rock masses. |