Patent ID: 6579962
Filing Date: 2003-06-17
Classification: C08F,C08J,Y10S

Abstract:
In a biaxially-oriented film product, the film product comprising a biaxially-oriented polypropylene film prepared from an isotactic polypropylene containing at least 0.5% 2,1 insertions polymerized in the presence of a racemic catalyst characterized by the formulaRâ€²Râ€³Si(2-RiInd)2MeQ2 wherein,Râ€², Râ€³ are each independently a C1-C4 alkyl group or an phenyl group, Ind is an indenyl group substituted at the proximal position by the substituent Ri and either otherwise unsubstituted or hydrogenated at one or more of the 4, 5, 6, and 7 positions, Ri is an ethyl, methyl, isopropyl, or tertiary butyl group, Me is a transition metal selected from the group consisting of titanium, zirconium, hafnium, and vanadium, and each Q is independently a hydrocarbyl group or containing 1 to 4 carbon atoms or a halogen, said film characterized as having a machine direction secant modulus greater than 1,400 MPa, a transverse direction secant modulus greater than 2,200 MPa, a kinetic film-to-film coefficient of friction of no more than 0.5, having a permeability to water of no more than 2.6 grams/m2/day and a permeability to oxygen of no more than 2,400 cm3/m2/day when configured in a film having a thickness of 18 microns.