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The present study was carried out to examine the effectiveness of an addition of triethylaluminium to tert-butyl perpivalate which is frequently used in industrial applications for initiating the copolymerisation of ethylene with vinyl acetate. For this purpose, polymerisation tests were carried out in the laboratory on a continuous basis at 1900 bar and 150°C. Vinyl acetate was added in concentrations of up to 36 wt.-% in the feed to the reactor. The organic peroxide concentration was 50 mole ppm; the concentration of organoaluminium alkyl was varied within the range of 0-75 mole ppm.The effects observed, namely an increase in the conversion and a decrease in the peroxide consumption were more marked than with the homopolymerisation of ethylene. This is attributable to the increased rate of chain growth in addition to the increased amount of radicals available.The properties of the copolymers obtained are changed only moderately by aluminium alkyl. Apart from a decrease in density and an increase in the melting point, a decrease in the polydispersity was observed. CCC 0003-3146/96/$07.00 87 G. Luft, M. Jabbari, M. Dorn len. Dies wird auf die zusatzliche Steigerung der Reaktionsgeschwindigkeit des Kettenwachstums neben dem erhohten Radikalangebot zuriickgefuhrt.Die Eigenschaften der erhaltenen Copolymeren werden durch das Triethylaluminium nur moderat verandert. Neben einer Abnahme der Dichte und einer Zunahme des Schmelzpunkts wurde eine Vemngerung der Polydispersitat beobachtet.

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