high pressure polymerization process to form an ethylene based polymer, ethylene based polymer, composition, article and film

摘要

high pressure polymerization process to form an ethylene based polymer, ethylene based polymer, composition, article and film a high pressure polymerization process to form an ethylene based polymer comprising the steps of: (a) injecting a first feed comprising ethylene and optionally a chain transfer agent (cta system) system into a first autoclave reactor zone operating under polymerization conditions to produce a first zone reaction product, the first cta system reactor zone having a transfer activity z1; and (b) (1) transferring at least part of the first zone reaction product to a second reactor zone selected from a second autoclave reactor zone or tubular reactor zone and operating under polymerization conditions, and optionally ( 2) recently injecting a second feed into the second reactor zone to produce a second zone reaction product, provided that the second reactor zone contains a cta system having a transfer activity z2; and with the proviso that the ratio of z1 / z2 is less than 1.