| abstract |
A method of grafting maleic anhydride or maleic anhydride/styrene onto a polyolefin, in particular polypropylene comprising mixing maleic anhydride or maleic anhydride-styrene/styrene homologue with the polyolefin in the presence of a catalyst having the formula: <IMAGE> wherein X=S, O or N; R1 and R2=an alkyl group, for example C1-C14 or higher; R=H or <IMAGE> wherein R3, R4 and R5 equal H, an alkyl group, (CH2)nCOOH, or mixtures thereof; and n=1 to about 6. |