This invention relates generally to films made from crystalline polypropylene
polymers. Specifically, this invention relates to films comprising crystalline
polypropylene polymer compositions containing both propylene homopolymers and propylene
copolymers. The compositions are prepared using metallocene catalyst systems comprising
at least two metallocenes in a polymerization process that involves the sequential
or parallel polymerization of propylene homopolymers and copolymers using propylene
with a small amount of comonomer, preferably ethylene. The resulting polymers are
excellent for use in the production of biaxially oriented films. Films prepared
with these propylene polymers have a significantly broader processability range
and can be evenly stretched at lower temperature compared to films prepared from
traditional polypropylene polymers.