olyacrylic acid, polyacrylamide, ethylene oxide copolymers such as Pluronic??? (a propylene oxide copolymer, available from BASF) and Tetronic??? (BASF) polyol surfactants; and polyethers, including water soluble polyoxyalkylene polymers, particularly poly(ethylene glycol) (PEG) and poly(ethylene glycol) derivatives such as poly(ethylene glycol) methyl ether, amine-terminated poly(ethylene glyco