A copolymer useful as a demulsifier or water clarifier may be prepared by
polymerizing at least one aromatic monomer having one or more
polymerizable double bonds; at least one oleophilic monomer having one or
more polymerizable double bonds; at least one ionizable monomer having a
polymerizable double bond; and at least one hydrophilic monomer having
one or more polymerizable double bonds, under polymerization conditions
sufficient to prepare a copolymer. The copolymer may, in some
embodiments, be prepared and used as a latex.