medium pressure solution polymerization process of double reactor polyethylene using a phosphinimin catalyst, linear low density polyethylene blown film, and ethylene copolymer and at least one c3-12 olefin.

摘要

A dual reactor process for the solution (co)polymerization of ethylene uses a catalyst having a phosphinimine ligand in each of the two reactors. In a preferred embodiment, the two reactors are operated at different temperatures and/or with different cocatalyst systems (such as "alumoxanes" and "ionic activators") for the preparation of linear low density polyethylene ("LLPDE") having a broad molecular weight distribution. Certain LLDPE polymers of this invention have an outstanding balance of physical properties (high dart impact strength and tear strength) excellent optical properties and excellent processability.