| 摘要 |
There is disclosed a foamed, opaque, oriented polymeric film laminate which comprises: (a) a thermoplastic polymer film containing a quantity of voids sufficient to render said film opaque, a substantial number of the voids containing at least one void-initiating particle which is phase distinct and incompatible with the polymer constituting the film, the void space occupied by the particle being substantially less than the volume of the void, with one generally cross-sectional dimension of the particle approximating a corresponding cross-sectional dimension of the void; and, (b) an optional void-free thermoplastic polymer skin layer adherently applied to at least one surface of polymer film (a), there being present in polymer film (a) and/or in optional skin layer (b) a quantity of vacant cells, the total volume of voids and cells being sufficient to substantially reduce the density of the entire polymeric film structure.
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