Method for preparing polyethylene with high melt strength

The present invention consists in a polymer base of ethylene which comprises making to react a ream of polyethylene with a derivative of alcoxiamina corresponding to the formula: (R1) (R2)No-R3 where R1 and R2 are each independently of one another, hydrogen, alkyl C4-42 or aryl C4-42, groups, hydrocarbon substituted comprising O and/or N, and where R1 and R2 together can form a ring structure; and where R3 is hydrogen, a hydrocarbon or group of hydrocarbon substituted comprising O and/or N. groups are preferred for R3 include alkyl -C1-19 aryl -C6-10 alkenyl -C2-19-O-alkyl C1-19 -O-aryl, C6-10 -NH-alkyl C1-19 -NH-aryl, C6-10 -N-(alkyl C1-19)2. R3 contains, with greater preference even an acyl group. The ream resulting increase in the resistance to the fusion with a higher ratio of the viscosities of stretching at 0.1 to 100 rad/s in comparison with the resins of polyethylene substantially similar that have not been made to react with a derivative of alcoxiamina.