| 摘要 |
A multilayer film structure, including (i) a core layer, wherein the core layer comprises a propylene polymer and is beta-cavitated, and preferably comprises a beta-nucleating agent and (ii) a first skin layer, wherein the first skin layer comprises a polar polymer. Optionally, the film further comprises a first intermediate layer (iii) between the core layer (i) and the first skin layer (ii). Embodiments may have the advantage of the benefits of a beta-cavitated film without the typical increase in permeability or water vapor transmission rates typically associated with beta-cavitated films.
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