Patent ID: 8273835

Claim:
A process for the preparation of ethylene homopolymers or copolymers in the presence of free-radical polymerization initiators at from 100° C. to 350° C. and pressures in the range of from 160 MPa to 350 MPa in a tubular reactor with at least two spatially separated initiator injection points, wherein the injecting initiator raises the temperature of the reaction mixture in the reaction zone following the injection point, and the first initiator injection point of the tubular reactor is not provided with initiator or is provided with so little initiator that the temperature of the reaction mixture does not rise more than 20° C. in the reaction zone following the first initiator injection point, wherein the process for feeding initiator comprises the steps a) providing at least two different initiators as a solution in a suitable solvent or in liquid state, b) mixing the initiators and optionally additional solvent in at least two static mixers, and c) feeding each of the mixtures to a different initiator injection point of the tubular reactor, and at least one of the initiator injection points of the tubular reactor is provided with initiator in the form of an initiator mixture.