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