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Abstract

An opaque, biaxially oriented polymeric film structure. The film structure comprises: a thermoplastic polymer matrix core layer having a first surface and a second surface, within which is located a strata of voids; positioned at least substantially within a substantial number of the voids is at least one spherical void-initiating particle which is phase distinct and incompatible with the matrix material, 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, at least approximating a corresponding cross-sectional dimension of the void; the population of the voids in the core being such as to cause a significant degree of opacity; and at least one thermoplastic polymer matrix skin layer adhering to at least the first surface of the core layer, within which is located a strata of voids; positioned within at least a substantial number of the voids is at least one inorganic void-initiating solid particle which is phase distinct and incompatible with the matrix material, 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, at least approximating a corresponding cross-sectional dimension of the void.

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First Claim