Polypropylene film and process for making same

Details Polypropylene film and process for making same Polypropylene film and process for making same

B - Operations, Transporting

29

C

18/1039, 117/210

B29C 47/00 (2006.01) B29C 55/06 (2006.01) B29C 55/12 (2006.01) B32B 27/32 (2006.01) C08J 7/06 (2006.01)

Patent

CA 2031466

ABSTRACT POLYPROPYLENE FILM AND PROCESS FOR MAKING SAME A thermoplastic film structure comprising a base portion of a thermoplastic resin which comprises polypropylene and a coating portion of an alkali metal salt of an alkyl sulfate is disclosed. The film is characterised by improved anti-blocking characteristics without the attendant problems associated with decreased clarity, adhesion and wettability common to films treated to improve their anti-blocking characteristics. The invention also provides a process for making the film structure in which the polypropylene-containing thermoplastic resin is extruded into a sheet; the sheet oriented in the longitudinal direction to form a monoaxially oriented film; the film coated with the alkali metal salt of an alkyl sulfate; and the coated film oriented in the transverse direction.

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