Process for producing acrylonitrile polymer film

Details Process for producing acrylonitrile polymer film Process for producing acrylonitrile polymer film

B - Operations, Transporting

29

D

18/527, 18/792

B29D 7/24 (1980.01)

Patent

CA 1099879

ABSTRACT OF THE DISCLOSURE An acrylonitrile polymer film is produced by the steps of: extruding an acrylonitrile polymer solution in a tubular shape into a coagulation liquid bath while a coagulation liquid is introduced into and withdrawn from the inside of the extruded tubular-shaped film; removing the solvent remaining in the coagulated tubular film, and; biaxially stretching the tubular film having a water content of 5 to 35% by weight based on the dry weight, at a temperature of 100°-170°C at least twice its original length both in the longitudinal and transverse directions by a tubular stretching procedure.

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