Process for the preparation of a biaxially oriented polypropylene film
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United States of America Patent
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Jul 19, 1988
Grant Date -
N/A
app pub date -
Sep 9, 1986
filing date -
Sep 14, 1985
priority date (Note) -
Expired
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Abstract
A process for the preparation of a biaxially stretch-oriented film having at least one opaque layer is described. The opaque layer is composed essentially of propylene polymer and fillers in a quantity of about 10 to 40% by weight, relative to the total weight of propylene polymer and fillers. In production, the granules are melted in a screw extruder, are forced through a die and are formed by cooling to give a preformed film. The preformed film is then stretch-oriented both along the machine direction and transversely perpendicular to the machine direction and is then heat-set. The fillers are added in the form of a masterbatch to the granules of unfilled polymers. The masterbatch should have a filler content of more than about 30% by weight.
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