Patent ID: 6924343

Claim:
A process for the polymerization of an ethylene polymer composition having an SHI 5/300 higher than 60 and a low gel level, wherein said ethylene polymer composition is homo- or co-polymerized in at least two polymerization stages using a catalyst prepared by reacting a support comprising a magnesium halide compound having the formula (1): (RO) 2-n MgX n (1) wherein R is a C 1 -C 20 alkyl or a C 7 -C 26 aralkyl, each the same or different, X is a halogen, and n is an integer 1 or 2, and an inorganic oxide; a compound having the formula (2): R 1 n 1 M m 1 X 1 ( 3m 1 -n 1 ) (2) wherein M is B or Al, each same or different R 1 is a C 1 -C 10 alkyl, each same or different X 1 is a halogen, m 1 is 1 or 2, n 1 is 1 or 2 when m 1 is 1 and n 1 is a from 1 to 5 when m 1 is 2; a magnesium composition containing magnesium bonded to a hydrocarbyl and magnesium bonded to a hydrocarbyl oxide, said magnesium composition having the empirical formula (3): R 2 n 2 (R 3 O) 2-n 2 Mg (3) wherein each same or different R 2 is a C 1 -C 20 alkyl, each same or different R 3 is a C 1 -C 20 alkyl, n 2 is between 0.01 and 1.99 which is the contact product of a dialkyl magnesium and an alcohol in a molar ratio of alcohol to dialkyl magnesium of 1.8-1.98 mol/mol, and a titanium halide compound having the formula (4): (R 4 O) n 3 TiX 2 4-n 3 (4) wherein each same or different R 4 is a C 1 -C 20 alkyl, each same or different X 2 is a halogen, and n 3 is 0 or an integer 1-3.