STRETCHED FILMS OF POLYPROPYLENE

摘要

A stretched film of polypropylene which is excellent in transparency, substantially free of an antiblocking agent and at least uniaxialy stretched and which is characterized in that it has uniformly distributed projections having a height ranging from 0.05 to 0.50 mu and a width ranging from 10 to 100 mu at least on the surface thereof as well as a method for preparing the foregoing stretched film of polypropylene which comprises the steps of forming, into a sheet, polypropylene which comprises a nucleating agent in an amount selected so that the crystallization temperature of polypropylene is increased by 1 to 10 DEG C by the addition thereof and then stretching the sheet at a temperature ranging from 140 to 165 DEG C are herein disclosed.