Polypropylene films which can be split into fine fibres, prodn

摘要

Polypropylene film which can be split into fine fibres when subjected to manual friction, shearing stress, crimping or fluid turbulence is produced by extruding a polypropylene having a flow rate of 50-250, or a mixture contg. such as polypropylene as main component, into a film, pref. of thickness 10-150 mu and orienting the cooled film longitudinally by stretching it axially to at least eight times its original lenght. A mixture of polypropylene with polyethylene or an ethylene-vinyl acetate copolymer may be used.