Polypropylene films

Details Polypropylene films Polypropylene films

1989-06-22

1992-02-04

Buffalow, Edith L.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428516, 525232, 525210, B32B 2700

Patent

active

050859439

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.

REFERENCES:
patent: 3663488 (1972-05-01), Kail

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