High density polyethylene (HDPE) resins were produced via the multi-reactor, Mitsui, stirred slurry process to give a 'four corners' type of product matrix with high and low molecular weights (MW) and broad and narrow molecular weight distributions (MWDs). Density was kept constant. Film processing and physical properties -including oxygen, carbon dioxide, and water vapor transmission rates -are presented. Lower MW and narrower MWD favor better barrier properties. The best barrier HDPE resin was blended with mLLDPE and films blown from these blends demonstrated the potential for application specific film strength and optical property tailoring while maintaining high barrier performance.
A test method useful in determining the effects of polymer additives upon water carry-over (WCO) in water quenched, cast film extrusion is presented. Data from this test is obtained on film specimens based in a Spherilene process HDPE resin individually doped with 250 and 500 ppm of six various primary and secondary antioxidants and acid scavengers. Water contact anglcs and film surface tension data is also presented. The WCO test is reproducible and data may be applied to commercial production. Different additives that carry out the same function in the polymer may have greatly varying WCO properties: these differences are not detected by equilibrium goniomctry.
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