Films with excellent machine direction (MD) tear properties comprise at least
one layer made from a polymer comprising:
(A) at least 50 weight percent (wt%) propylene; and
(B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative
of component (B) unsatuarated comonomers are the C4-20 -olefins,
C4-20 dienes, styrenic compounds, and the like. Preferably, the film
has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss
of greater than about 65, and (iii) dart value of greater than about 100 g/mil.
In one preferred embodiment, the layer comprises a compolymer characterized as
having at least one of the following properties: (i) 13C NMR peaks corresponding
to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity,
(ii) a B-value greater than about 1.4 when the comonomer content, i.e., the units
derived from ethylene and/or the unsaturated comonomer(s), of the copolymer is
at least about 3 wt %, (iii) a skewness index, Six, greater than about
-1.20, (iv) a DSC curve with a Tme that remains essentially the same
and a Tmax that decreases as the amount of comonomer, i.e., the units
derived from ethylene and/or the unsaturated comonomer(s), in the copolymer is
increased, and (v) an X-ray diffraction pattern that reports more gamma-forn crystals
than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.