Composition of ethylene-alpha-olefin, the grafted composition and polymerization process in several stages.

A composition copolymer ethylene / alpha DOS ENDE ethylene / alpha GETS IN THE PRESENCE OF A CATALYST by polymerizing olefins containing an oxy A) AND AT LEAST TWO KINDS OF SPECIFIC metallocene compounds (B). A composition copolymer graft-modified ethylene / alpha copolymer composition GRAFT ETHYLENE / ALPHA LIOLEFINA. A PROCESS MULTISTAGE olefin polymerization comprises preparing a first copolymer ethylene / alpha INA presence of a catalyst comprising a OXI ince organoaluminum (A), and two metallocene compounds SPECIFIC (B NO / ALFA A OXY Oceno SPECIFIC (B ' ). The compositions have excellent moldability and heat stability, and can be used to produce a film with high transparency, high hardness and high resistance to MECHANICAL LOCK. gRAFT COMPOSITIONS MODIFIED BY PROVIDING MATERIAL good adhesion to highly polarized.