Patent ID: 9441056
Filing Date: 2016-09-13
CPC Classification: C08F

Claim Text:
1. A slurry process for preparing an ethylene polymer having a melt flow ratio F/P, which is the ratio among the melt index value measured according to ASTM 1238 condition “F” and the melt index value measured according to ASTM 1238 condition “P” of equal to or lower than 27, carried out in two or more stages of polymerization at temperatures from 60-120° C., in which at least two of the polymerization stages are carried out under different amounts of molecular weight regulator, the process being carried out in the presence of (A) a solid catalyst component comprising Ti, Mg, Al and halogen, having a porosity (P F ), measured by the mercury method and due to pores with radius equal to or lower than 1 μm, of at least 0.3 cm 3 /g, and a surface area determined by BET method, of lower than 100 m 2 /g, and being further characterized by the fact that more than 10% of the titanium atoms are in a valence state lower than 4 and (B) an organoaluminum compound.