Suitable nonionic surfactants are, for example, maleic anhydride copolymers , e.g. composed of maleic anhydride and C20 24 1 olefin, polyisobutylene succinic anhydrides or {HEAD ~ the reaction products} of these with hydroxypolyethylene glycol esters, diethylaminoethanol or {TAIL ~ amines} such as tridecylamine, octylamine or polyetheramine, tetraethylenepentaamine or mixtures thereof 
Suitable nonionic surfactants are , for example , maleic anhydride copolymers , e.g. composed of maleic anhydride and C20 24 1 olefin , polyisobutylene succinic anhydrides or { HEAD ~ the reaction products } of these with hydroxypolyethylene glycol esters , diethylaminoethanol or { TAIL ~ amines } such as tridecylamine , octylamine or polyetheramine , tetraethylenepentaamine or mixtures thereof
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