Resin compositions for producing biaxially oriented polypropylene films
OwnerSehyun Kim, Michael Stephans +1inventors
InventorsSehyun Kim, Michael Stephans, John Avolio
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Abstract
Polypropylene resin compositions are provided that are useful in the production of biaxially oriented polypropylene films (BOPPs). The resins of the present invention are blends of high crystalline (low solubles) polypropylene homopolymer and an ethylene/propylene random copolymer (RCP). These blends can be used to replace standard high solubles BOPP grade polypropylene homopolymers. In addition, the use of high crystalline polypropylene homopolymers in the blends imparts improved stiffness to the finished films while maintaining good processability of the blends.
Claims14
A biaxially oriented polypropylene film comprising:
- about 70 to about 95 percent by weight of a propylene homopolymer having a xylene soluble content of 5 percent or less and a crystallinity of at least 55 percent;
- and
- about 5 to about 30 percent by weight of an ethylene/propylene random copolymer having an ethylene content of about 0.5 to about 7 percent by weight.
A biaxially oriented polypropylene film comprising,
- about 60 to about 85 percent by weight of a propylene homopolymer having a xylene soluble content of 5 percent or less and a crystallinity of at least 55 percent;
- and
- about 15 to about 40 percent by weight of an ethylene propylene random copolymer having an ethylene content of about 0.5 to about 7 percent by weight.
Dependencies are inferred from the claim text.