higher olefin more complex polymer substrates may be prepared using a third component the polymerization reaction to form the polymer substrate is generally carried out in presence of a ziegler natta catalyst in a hydrocarbon solvent the polymer substrate that is ethylene copolymer or terpolymer is an oil soluble substantially linear rubbery material having a number average molecular weight ranging from about 10 000 to about 1 000 000 with a preferred molecular weight ranging from about 25 000 to about 250 000 and a most preferred molecular weight ranging from about 50 000 to about 150 000 an ethylenically unsaturated carboxylic acid material is next grafted onto the predescribed polymer backbone the preferred compound maleic anhydride was grafted onto the polymer backbone by free radical method polymer substrates are available commercially particularly useful are those containing from about 30 to about 80 mole percent ethylene units about 70 to about 20 mole percent propylene units maleic anhydride grafted polyisobutylene or hydrogenated polybutadiene polyisoprene or star polymers made from the above or hydrogenated copolymers of butadiene and isoprene with each other or styrene may also be used the polymer intermediate possessing carboxylic acid acylating functions is reacted with an amino sulfonylaromatic of the following general formula str2 wherein r is nh 2 ch 2 aryl nh 2 or ch 2 ch 2 n nh 2.