Method of producing polyproplene films

Details Method of producing polyproplene films Method of producing polyproplene films

1991-11-18

1993-09-21

Buffalow, Edith

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2642888, D01D 524

Patent

active

052466590

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
patent: 4293608 (1981-10-01), Isaka et al.

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