Patent ID: 7709584

Claim:
A process comprising polymerizing ethylene to form ethylene homopolymers in a tubular reactor having two or more polymerization zones at temperatures from 160° C. to 350° C. and pressures in the range from 500 to 5000 bar, with oxygen as an initiator, and a molar mass regulator comprising, one or more aliphatic ketones of the formula I: wherein the variable R 1 is a C 1 -C 6 alkyl or C 3 -C 12 -cycloalkyl in said polymerization zones, the process having a conversion rate greater than 25%, and the ethylene homopolymers have a density from 920 to 935 kg/m 3 and a melt flow index as specified in DIN 53735 (190° C./2.16 kg) from 30 to 50 g/10 min.