Method for optimizing film properties of polyethylene blown film

摘要

Improving polyethylene film properties may be accomplished by measuring the specific energy input (SEI) to the extruder and then adjusting a process parameter in response to a change in the SEI and/or by introducing both a free radical initiator and an alkali earth metal stearate into the polymerization. Alternatively or in addition thereto, selecting the optimum free radical initiator for a particular polyethylene resin polymerized in the presence of a selected catalyst between two resin properties may be accomplished by examining the ratio of: $\frac{\%\mathrm{variation}\mathrm{in}a\mathrm{first}\mathrm{property}}{\%\mathrm{variation}\mathrm{in}a\mathrm{second}\mathrm{property}}$ of polyethylene resins individually made with each free radical initiator under consideration. The free radical initiator may be oxygen, peroxides, peroxyketals, peroxyesters, and/or dialkyl peroxides.