PREPARATION OF LOW DENSITY, LOW MODULUS ETHYLENE COPOLYMERS IN A FLUIDIZED BED

摘要

Ethylene copolymers having a density of less than 0.91 g/cm3 and a 1% secant modulus of less than 140,000 kPa are continuously prepared in a fluidized bed without particle agglomeration by continuously contacting, in such fluidized bed, at a temperature of from 10.degree.C up to 80.degree.C, a gaseous mixture containing (a) ethylene and at least one higher alph olefin in a molar ratio of such higher alpha olefin to ethylene of from 0.35:1 to 8.0:1, and (b) at least 25 mol percent of a diluent gas, with a catalyst composition prepared by forming a precursor composition from a magnesium compound, titanium compound, and electron donor compound; diluting said precursor composition with an inert carrier; and activating the diluted precursor composition with an organoaluminum compound.