Patent ID: 6969556
Filing Date: 2005-11-29
Classification: C08J,C08L,Y10T

Abstract:
1. An oriented polymeric film comprising at least one (a) layer comprising (a) a first material which is very highly crystalline polypropylene homopolymer (VHCPP) having a very high intermolecular stereoregularity consisting of at least about 98% of isotactic polymer the remainder of the material (if any) being atactic polymer; together with (b) a second material comprising where the second material is added in an amount sufficient for the film to exhibit two or more of the following properties measured in any direction parallel to the film surface and where necessary normalized for a 20 micron thick film: WVTR less than about 6 g/24 hours/m OTR less than about 1,500 cm Young's modulus from 4000 MPa to 5000 MPa, Flexural modulus from 0.4 N(mm) haze less than about 1.1%; and/or a clarity greater than 97%.