| abstract |
A method of grafting maleic anhydride or maleic an- hydride/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:-wherein X = S, O or N;R, and R<sub>2</sub> = an alkyl group;R=H orwherein R<sub>3</sub>, R<sub>4</sub> and R<sub>5</sub> equal H,an alkyl group, (CH<sub>2</sub>)<sub>n</sub>COOH, or mixtures thereof; andn = 1 to about 6, |