High dart impact and tear films from titanium based prepolymer catalyzed polyethylenes

Abstract

A polyethylene film with enhanced physical and mechanical properties, along with a method for its production, is presented. Notably, the film exhibits a 2% secant modulus exceeding 20,000 psi, dart impact resistance greater than 500 g/mil, and machine direction (MD) tear strength above 500 g/mil. The production method involves reacting ethylene with a comonomer in the presence of a Ziegler-Natta (titanium) base prepolymer at temperatures ranging from 75° C. to 95° C. The process operates under an ethylene partial pressure between 90 psia and 125 psia, with a comonomer-to-ethylene ratio of 0.08 to 0.15, enabling the formation of an ethylene-based polymer without the need for additional cocatalysts or antistatic agents in the gas phase polymerization process.

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