MULTI-LAYER POLYPROPYLENE FILM STRUCTURE

摘要

An oriented multi-layer polypropylene film structure comprises a base layer comprising polypropylene of relatively high stereoregularity and a skin layer comprising a polyolefin of relatively low stereoregularity coextruded on at least one surface of the base layer. The skin layer contains a combination of finely divided silica, a silicone oil and a polymer which is incompatible with said skin layer polyolefin and which has a melting point exceeding that of the skin layer polyolefin by at least 83.degree.C (150.degree.C).