Method of preparing low-density ethylene copolymers

摘要: Method for the copolymerization of ethylene with C 4 -C 8 alpha-olefins by means a suspension method in an organic liquid, at temperature from 50° C. to 70° C., pressure less than about 10 bar, on Ziegler catalyst constituted by: (a) alkylaluminum or halide; (b) product reaction halogenated derivative titanium support material; material being solid, spheroidal spray drying solution magnesium chloride ethanol containing least one additional compound chosen following classes: aliphatic, cycloaliphatic aromatic liquid hydrocarbons boiling point higher that atmospheric pressure; polar, hydroxy ester compounds which are solid spheroidal, spray-dried also having characteristics: particle form: spherical size 1 100 microns. Apparent density particles: 0.1 g/ml; alcoholic hydroxyl group content: 1.5 20% weight; surface area: m 2 /g; porosity 1.2 3.5 ml/g; pore radius: 1,000 65,000 Angstroms.