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Journal of Plastic Film and Sheeting
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HDPE Barrier Film Resins - MW and MWD Effects - and their Blends with mLLPDE

Timothy J. Cowell

ExxonMobil Chemical Company Baytown, Texas 77520, USA

Jerry M. Johnson

ExxonMobil Chemical Company Baytown, Texas 77520, USA

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.

Key Words: molecular weight • molecular weight distribution • water vapor transmission rate • O2 transmission rate • CO2 transmission rate • barrier films • blends • mLLDPE • HDPE • optical properties • tensile properties • Elmendorf tear strength • dart drop impact test • puncture resistance

Journal of Plastic Film and Sheeting, Vol. 18, No. 2, 91-103 (2002)
DOI: 10.1177/8756087902018002004
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