Patent ID: 7407699

Claim:
An oriented web produced from a perforated extruded sheet comprising a propylene polymer comprising beta-spherulites in an amount sufficient to produce a K-value of about 0.2 to 0.95 when measured by x-ray diffraction or to show a beta crystalline melting peak during the first or second heating scan when measured using a differential scanning calorimeter, wherein the oriented web is biaxially oriented and wherein the web has thickness in the node junction region between the machine direction and transverse direction strands that is at least 10% less than that of an otherwise identical biaxially oriented web made from a perforated, extruded propylene sheet with no added beta nucleant and the same starting sheet thickness and wherein the oriented web has a tensile strength measured at 2% elongation in the machine direction, that is at least 10% higher than that of an otherwise identical biaxially oriented web made from a perforated, extruded propylene sheet with no added beta nucleant and the same starting thickness.