Title: Process for producing a permeable membrane

Abstract: A process for preparing permeable membranes which comprises mixing in the molten state two different kinds of thermoplastic synthetic resins which are partly compatible with each other, shaping the molten mixture into a sheet- or film-like melt, passing the film- or sheet-like melt through a heated zone, cooling and solidifying it, the time from the shaping of the molten mixture into the film- or sheet-like melt to its cooling and solidification (melt maintenance time) being adjusted to 10 to 600 seconds, treating the resulting film or sheet with a solvent which is a good solvent for one of the component resins but is a poor solvent for the other to dissolve and remove the soluble resin, and drying the product. In place of the resin to be removed by the solvent, rubbers or oligomers having partial compatibility with the resin which remains undissolved can be used.

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Inventors: Shinomura, Toshihiko (Yokohama, JP)

Application Number: 847065
Filing Date: 1977-10-28
Publication_date: 1980-04-08
Assignee: Nippon Oil Co., Ltd. (Tokyo, JP)
Primary Class(es): 156/79 156/244.24, 156/244.27, 210/500.27, 210/500.33, 264/49, 264/171.23, 264/173.14, 264/173.19, 264/210.6, 264/213, 264/234, 264/288.8, 264/345
Other Classes:
US Patent Ref:

3243486	Mar, 1966	Pilaro	264/95.
3382305	May, 1968	Breen	264/171.
3697367	Oct, 1972	Schwarz	264/171.
3770537	Nov, 1973	Elton	264/49.
3819782	Jun, 1974	Irie	264/49.
3840625	Oct, 1974	Yamamoto et al.	264/49.
3869310	Mar, 1975	Fukushima et al.	264/49.

Other Refs: 1199566

Jul, 1970	GB

Primary Examiner: Thurlow, Jeffery R.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack