Process for producing permeable membranes

Details Process for producing permeable membranes Process for producing permeable membranes

1976-03-22

1978-07-11

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

210500M, 264210R, 264DIG13, 429254, 521 61, 521918, B29D 2700

Patent

active

041002385

ABSTRACT:
A process for preparing permeable membranes which comprises kneading in the molten state two different kinds of thermoplastic synthetic resins which are partly compatible with each other, fabricating the molten mixture into a sheet, film or hollow article, treating the fabricated article 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 former resin, drying the fabricated article, and then stretching it. 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.

REFERENCES:
patent: 3734986 (1973-05-01), Kato et al.
patent: 3796778 (1974-03-01), Gallacher
patent: 3819782 (1974-06-01), Irie
patent: 3833708 (1974-09-01), Miller et al.
patent: 3852224 (1974-12-01), Bridgeford

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