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Vastly improved film surface tension values were achieved using elevated corona treater roll temperatures in the production of BOPP film with a coextruded skin layer designed for subsequent metallization. These film surface tension values did not significantly decrease with time. Optimizing these corona treater process variables, a new propylene/butene- 1 copolymer was coextruded as the metallizing layer in the BOPP film construction. When metallized, this film provided improved barrier to water vapor transmission by a factor of 5:1 when compared to a similar film produced with a propylene/ethylene copolymer as the metallizing layer. Stringent analysis of the surface of the propylenebutene copolymer revealed that a unique smoothness of its surface enhanced the barrier properties of the film after metallizing. The surface of the ethylene/propylene copolymer was considerably more rough.
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Improved Barrier Properties with Metallized Films from Corona Process Improvements and from Copolyme
