THE EFFECT OF THE ETHYLENE PRESSURE ON ITS REACTION WITH 1-HEXENE, 1-OCTENE AND 4-METHYL-1-PENTENE

Copolymers of ethylene and 1-hexexe, 1-octene and 1-methyl-1-pentene w ere obtained using Et[In]2ZrCl2/MAO catalyst at various pressures. The increase of 1-hexene and 1-octene concentration in the feed increases catalyst activity(g/nZr.h.bar) and productivity(g/nZr.h). For 4-methy l-1-pentene the activity is independent on comonomer concentration. In creasing the ethylene pressure the productivity of the copolymerizatio n increases and the activity shows a weak decay. Characterization of t he copolymer shows that at higher pressure the cristallinity of the co polymers is higher due to lower comonomer incorporation. There is a go od linear correlation of cristallinity with comonomer concentration in the feed for 1-hexene and 1-octene at a fixed pressure, but not for 4 -methyl-1-pentene.