Patent ID: 9732168
Date: 2017-08-15
CPC Classifications: C08F

Claim:
1. A method for the polymerization or copolymerization of ethylene, which method comprises: polymerizing or copolymerizing ethylene at an operating pressure of from 1000 to 3000 bar, at a polymerization temperature between 140° C. and 205° C. in a high pressure reactor, operating continuously or batch wise and in the presence of a radical polymerization initiator, wherein the polydispersity, PD, of the resulting polyethylene is between 1.2 and 4.5, as measured by gel permeation chromatography, and the weight average molecular weight of the resulting polyethylene is at least 284,000 to 547,000 g/mol, characterized in that the radical polymerization initiator is a hydroxylamine ester of formula (C′) used in an amount of from 5 to 200 parts per million based on the weight of the total reaction mixture, wherein solely the hydroxylamine ester of formula (C′) is used as the radical initiator, wherein X is hydrogen or C 1 -C 18 alkyl and R 100 is C 4 -C 24 alkyl.