ENHANCEMENT OF APPEARANCE, STIFFNESS, AND TOUGHNESS OF OLEFINIC BLOWN FILMS WITH CYCIC OLEFIN COPOLYMERS

摘要

Cyclic olefin copolymers (COC) offer many benefits for packaging films, including stiffness, strength, transparency, gloss, heat resistance, improved thermoforming, moisture, and alcohol barrier to name a few. Using full factorial experimental design, COC glass transition temperature, COC modification and blow-up ratio were studied to show how COC influences performance of several key blown film properties. Three-layer packaging films can be engineered with modified COC to provide higher than expected toughness, strength, and stiffness. By splitting COC into at least two layers in five layer structures, further significant property enhancements are possible without changing COC content.