Process for producing an ethylene polymer composition

PREPARATION PROCESS OF A COMPOSITION OF ETHYLENE POLYMERS WHICH INCLUDES A MI2 FLUIDITY INDEX POLYMER OF 5 TO 1000 G / 10 MIN AND A MI5 FLUIDITY INDEX POLYMER OF 0.01 TO 2 G / 10 MIN, THE RATIO OF THESE INDICES IS 500 TO 50,000 AND THE WEIGHT RATIO OF THE TWO POLYMERS IS EQUAL TO (30 TO 70): (70 TO 30), ACCORDING TO WHICH A PART OF ETHYLENE IS INTRODUCED IN A FIRST REACTOR, A CATALYST DERIVED FROM A TRANSITIONAL METAL THAT PRESENTS AN INTRINSIC DISTRIBUTION OF MOLECULAR WEIGHTS DEFINED BY A MW / MN INTRINSIC RELATION LESS THAN OR EQUAL TO 10 AND A CONSTANT OF DEACTIVATION LESS THAN OR EQUAL TO 0.5 H-1, AND A COCATALIZER, THERE IS A POLYMERIZATION OF ETHYLENE, A MEDIUM COMPRISING ONE OF THE POLYMERS, THE CATALYST AND THE COCATALIZER, IS REMOVED FROM THIS REACTOR. THE MEDIUM AND ANOTHER PART OF ETHYLENE, WHICH IS POLYMERIZED TO FORM THE OTHER POLYMER, IS INTRODUCED IN A SECOND REACTOR.