ST-TCP: TCP Layer Server Fault Tolerance

Method for the copolymerization of ethylene with C4-C8 alpha-olefins by means of a suspension method in an organic liquid, at a temperature of from 50 DEG C. to 70 DEG C., at a pressure of less than about 10 bar, on a Ziegler catalyst constituted by: (a) an alkylaluminum or alkylaluminum halide; (b) the product of the reaction of a halogenated derivative of titanium with a support material; the support material being the solid, spheroidal product of the spray drying of a solution of magnesium chloride in ethanol containing at least one additional compound chosen from the following classes: aliphatic, cycloaliphatic or aromatic liquid hydrocarbons with a boiling point higher than that of ethanol at atmospheric pressure; polar, organic hydroxy or ester compounds which are solid or liquid with a boiling point higher than that of ethanol at atmospheric pressure; the solid, spheroidal, spray-dried product also having the following characteristics: particle form: spherical with a size of from 1 to 100 microns. Apparent density of the particles: from 0.1 to 1 g/ml; alcoholic hydroxyl group content: from 1.5 to 20% by weight; surface area: from 10 to 100 m2/g; porosity from 1.2 to 3.5 ml/g; pore radius: from 1,000 to 65,000 Angstroms.