Polypropylene films

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B - Operations, Transporting

32

B

18/1041

B32B 27/00 (2006.01) C08J 5/18 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 45/00 (2006.01)

Patent

CA 1313580

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.

583140

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