| abstract |
Adhesive tape backings comprising isotactic polypropylene blended or mixed with at least a second polyolefin. The backing is biaxially stretched so as to provide a film having any one or a combination of the following preferred characteristics:A. Puncture energy up to 20 J/cm2 when 2.54 cm wide samples are tested by the method set herein, or up to 90 J/cm2 when 1.27 cm wide samples are tested by the method set out herein.B. Puncture elongation up to about 1.3 cm when 2.54 cm wide samples are tested by the method set out herein, or up to 2.0 cm when 1.27 cm wide samples are tested by the method set out herein.C. Tensile strength up to 140 MPa in the MD.In a preferred embodiment, the second component comprises polyethylene, polybutylene, or syndiotactic polypropylene. |