Process for producing high density ethylene polymer composition having high melt strength

摘要

A process for preparing a composition comprising A) an ethylene-based polymer having a density of at least 0.940 g / cc and B) an ethylene homopolymer formed by polymerizing a reaction mixture comprising ethylene using a free radical, high pressure polymerization process comprises A) is added to the melt stream of component (B) after component (B) is withdrawn from the separator and before component (B) solidifies in the pelletizer. The polymerization configuration for preparing the composition comprises at least one reactor, at least one separator, at least one pelletizer, and a device used to feed component (A) to the melt stream of component (B) before the pelletizer in the molten state. do. The composition has a ratio of the melt strength of the composition (B) to the composition (B) of at least 1.04 and a density greater than 0.920 g / cc.