Opaque multilayered film having an inherent resistance to delamination
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United States of America Patent
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-
Jun 25, 1991
Grant Date -
N/A
app pub date -
Dec 22, 1988
filing date -
Dec 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an opaque, biaxially stretch-oriented, polyolefinic multilayered film comprising an opaque core layer and two transparent top layers. The core layer contains a mixture of 1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene, 2) about 5 to 25% by weight of an inert, particulate filler, and 3) about 5 to 30% by weight of a hydrocarbon resin being compatible with the thermoplastic polymer and having a softening point in the range from about 100.degree. to 160.degree. C., the percentages being each time related to the total weight of the mixture. The top layers are free from admixtures comprising particulate filler and resin. The film possesses high resistance to delamination.
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