Fluorocarbon membranes and process for making fluorocarbon membr

Details Fluorocarbon membranes and process for making fluorocarbon membr Fluorocarbon membranes and process for making fluorocarbon membr

1988-05-04

1990-02-20

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

55 16, 21050023, 21050036, 26417717, 264178R, 2642091, 521 61, 521 64, 521134, 521145, C08L 926, B01D 1300

Patent

active

049024566

ABSTRACT:
Microporous poly (tetrafluoroethylene-co-perfluoro (alkyl vinyl ether)) (PFA) or poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) membrane or hollow fibers are formed from a melt blend of 10 to 35 weight percent of PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and cooled to effect phase separation of the PFA or FEP from the blend. The solvent is removed from the PFA or FEP by extraction and the porous PFA or FEP is dried under restraint to prevent shrinkage.

REFERENCES:
patent: 2915483 (1959-12-01), Barnhart
patent: 3379658 (1968-04-01), Kemper
patent: 3518332 (1970-06-01), Sklarchuk et al.
patent: 3536796 (1970-10-01), Rock
patent: 4181983 (1980-01-01), Kulkarni
patent: 4623670 (1986-11-01), Mutoh et al.
patent: 4702836 (1987-10-01), Mutoh et al.

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