Polypropylene films
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United States of America Patent
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Feb 4, 1992
Grant Date -
N/A
app pub date -
Jun 22, 1989
filing date -
Nov 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention concerns biaxially oriented polypropylene films containing from 1 to 40 percent by weight of a hydrocarbon resin, the resin being substantially miscible with the polypropylene, and the film having a crease retention of at least 50% as measured by ASTM D920-49. The hydrocarbon resin is preferably a terpene resin, a hydrogenated synthetic resin or a compatible rosin. Crease retention values in excess of 70% have been achieved in particular by orienting the films at a temperature of at least 10 Centigrade degrees below the crystalline melting point of the polypropylene.
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