initiator are generally used in a weight percent ratio range of about 3 1 to about 30 1 preferably about 1 1 to about 6 1 the initiator grafting is preferably carried out in an inert atmosphere such as that obtained by nitrogen blanketing while the grafting can be carried out in the presence of air the yield of the desired graft polymer is generally thereby decreased as compared to grafting under an inert atmosphere substantially free of oxygen the grafting time will usually range from about 0 1 to 12 hours preferably from about 0 5 to 10 hours more preferably 0 5 to 3 hours the grafted polymer can be reacted with a suitable amine in a conventional manner using reactants and conditions known in the art useful amine compounds include mono and polyamines having from about 2 to about 60 preferably from about 3 to about 20 total carbon atoms and from about 1 to about 12 preferably from about 2 to about 7 nitrogen atoms in the molecule these amines can be hydrocarbyl amines or hydrocarbyl amines having additional groups such as alkoxy groups amide groups imidazoline groups and the like useful amines include 1 2 diaminoethane 1 3 diaminopropane 1 4 diamonobutane 1 6 diaminohexane diethylene triamine triethylene tetramine tetraethylene pentamine 1 2 propylene diamine di 1 2 propylene.