METHOD OF REDUCING FILM DENSITY AND RELATED PRODUCT
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United States of America Patent
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Issued Date -
Sep 25, 2008
app pub date -
Mar 21, 2008
filing date -
Mar 22, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A microvoided film formed by mixing a microvoid forming additive with a composition including a polymeric material. The microvoided film includes a printability additive. The microvoids formed during the processing of the composition to convert it into a film result in a reduction of the density of the film, making a lighter weight film requiring less polymeric material to produce a film of desired thickness while maintaining suitable structural characteristics. The microvoids are formed through .beta. crystallization of the polymeric material during a cold drawing stage of the film fabrication process. The microvoided film may be fabricated to be opaque with or without pigment additive included in the composition.
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