Polymeric films
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United States of America Patent
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-
Oct 2, 1990
Grant Date -
N/A
app pub date -
Nov 2, 1989
filing date -
Nov 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns polymeric films, in particular, but not exclusively, in the form of synthetic paper. The films have a rough surface provided by a blend of a first polymer having a melt flow index of not more than 1 g/10 mins as measured by ASTM D1238/73 (condition L) with at least one polymer chemically incompatible with the first polymer. The first polymer preferably does not flow under these conditions, and the incompatible polymer preferably has a melt flow index of from 4 to 50 g/10 mins under ASTM D1238/73 (condition L). The polymers of each layer are preferably polyolefins. The base layer is of voided polypropylene. The rough surface can provide writeability, or it can be printed or metallized to provide a unique appearance.
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