Polyethyulene process

Claim 1

IN A CONTINUOUS PORCESS FOR LPREPARING POLYMERS OF ETHYLENE BY CONTACTING AN ETHYLENE-CONTAINING FEED STREAM IN A POLYMERIZATION ZONE WITH A FREE RADICAL GENERATING POLYMRIZATION INITIATOR AT A POLYMERIZIANG TEMPERATURE AND PRESSURE, THE IMPROVEMENT COMPRISING: (A) CARRYING OUT THE POYMERIZATION IN A POLYMERIZATION ZONE WITH IS SUBSTANTIALLY FREE OF ACCUMULATED DEPOSITS OF POLYETHYLENEF (B) EMPLOYING A FREE RADICAL GENERATING POLYMERIZATION INITIATOR HAVING A HALF-LIFE AT 185*F. OR FROM 5 TO 50 MINUTES; (C) MAINTAINING A PRESSURE IN SAID ZONE WHICH DOES NOT EXCEED 18,500 P.S.I.G.; (D) MAINTAINING AN INITIATION TEMPERATURE IN SAID ZONE WHICH DOES NOT SUBSTANTIALLY EXCEED 365*F.; (E) INTRODUCING INTO SAID ZONE AT LEAST ONE POLYMERIZATION INHIBITOR SELECTED FROM THE CLASS CONSISTING OF NUCLEARLY SUBSTITUTED PHENOLS, BIPHENOLS AND BISPHENOLS WHEREIN EACH PHENOLIC NUCLEUS HAS AT LEAST ONE SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF HYDROXY, CARBOXYL, CARBONYL, NITRO, AMINO, AMINOLOWERALKYL, LOWERALKYLAMINO, LOWER ALKYL, LOWER ALKENYL, LOWER ALKOXY AND LOWER ALKACYL GROUPS, SAID INHIBITOR BEING INTRODUCED INTO SAID ZONE IN AT LEAST AN AMOUNT SUFFICIENT TO PRODUCE POLYETHYLENE RESINS WHICH ARE CAPABLE OF FABRICATION INTO FIMS HAVING A TEAR FACTOR OF AT LEAST 5.5, A GLOSS OF AT LEAST 110, A HAZE OF LESS THAN 4,5, A TRANSPARENCY OF AT LEAST 65, A BACKGROUND OF AT LEAST 5, A LOW TEMPERATURE BRITTLENESS OF 0, AND A STRESS CRACK RESISTANCE OF AT LEAST 200.