Process for producing a permeable membrane

Details Process for producing a permeable membrane Process for producing a permeable membrane

1977-10-28

1980-04-08

Thurlow, Jeffery R.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624424, 15624427, 210500M, 264 49, 264171, 2642888, 264234, 264345, 2642106, B29H 720, B29D 722

Patent

active

041971485

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.

REFERENCES:
patent: 3243486 (1966-03-01), Pilaro
patent: 3382305 (1968-05-01), Breen
patent: 3697367 (1972-10-01), Schwarz
patent: 3770537 (1973-11-01), Elton
patent: 3819782 (1974-06-01), Irie
patent: 3840625 (1974-10-01), Yamamoto et al.
patent: 3869310 (1975-03-01), Fukushima et al.

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