Low density polyolefin resins with low molecular weight and high molecular weight components, and films made therefrom

摘要

Disclosed herein are ethylene-based polymers produced using dual metallocene catalyst systems. These polymers have low densities, high molecular weights, and broad molecular weight distributions, as well as having the majority of the long chain branches in the lower molecular weight component of the polymer, and the majority of the short chain branches in the higher molecular weight component of the polymer. Films produced from these polymers have improved impact and puncture resistance.

主权项

1. An ethylene polymer composition comprising a higher molecular weight component and a lower molecular weight component, wherein:
a ratio of the Mp of the higher molecular weight component to the Mp of the lower molecular weight component is in a range from about 5:1 to about 100:1; a number of LCB of the lower molecular weight component is in a range from about 5 to about 50 LCB per million total carbon atoms; and a number of LCB of the higher molecular weight component is less than or equal to about 5 LCB per million total carbon atoms.