Stretched films of polypropylene

Details Stretched films of polypropylene Stretched films of polypropylene

B - Operations, Transporting

29

C

18/1043

B29C 55/02 (2006.01) B29C 55/00 (2006.01) B29C 59/02 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2017246

ABSTRACT OF THE DISCLOSURE A stretched film of polypropylene which is excellent in transparency, substantially free of an antiblocking agent and at least uniaxially stretched and which is characterized in that it has uniformly distributed projections having a height of from 0.05 to 0.50 µ and a diameter of from 10 to 100 µ 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°C by the addition thereof and then stretching the sheet at a temperature ranging from 140 to 165 °C are herein disclosed.

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