Asymmetric porous film materials and process for producing same

C - Chemistry – Metallurgy – 08 – J

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C08J 9/28 (2006.01) B01D 39/08 (2006.01) B29C 55/00 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1099464

ABSTRACT OF THE DISCLOSURE Porous film materials composed of polytetrafluoro- ethylene, having an asymmetric structure and suitable for industrial use in mass transfer operations is disclosed, as is a process for producing the materials by stretching the film using a pair of revolving rolls which are heated to a temperature lower than the melting point of the film. Stretching is produced by revolving the two rolls at different speeds which also tends to produce a compressive force in the thickness of the film. The rolls are heated to different temperatures to produce a tempera- ture difference of preferably 50C or more. The combination of the compressive force and the temperature gradient in the thickness of the film is believed to produce the asymmetric structure in the resulting porous film materials which are characterized by a fiber structure in the front surface which is different from that in the back surface.

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