Liquid purification or separation – Filter – Material
Patent
1988-08-05
1989-06-27
Foelak, Morton
Liquid purification or separation
Filter
Material
21050028, 21050037, 264 41, 521 64, 521134, 521138, C08J 928
Patent
active
048427403
ABSTRACT:
This invention discloses novel membranes comprised of a blend of polyarylate and polybenzimidazole polymers. A membrane prepared from the blend of polybenzimidazole and polyarylate polymers exhibits enhanced properties over membranes prepared solely from either a polyarylate or a polybenzimidazole polymer. The addition of the polyarylate to the polybenzimidazole membrane allows the composition to be more thermally processable and less susceptible to moisture. The presence of the polybenzimidazole renders the polyarylate less reactive to solvents and increases its thermal stability. In addition, it has been surprisingly found that membranes prepared from the polybenzimidazole polyarylate blends show high regeneration capacity while retaining good flux ranges. The membranes prepared by this process exhibit good separation characteristics and provide an improved membrane with enhanced qualities over prior art membranes.
REFERENCES:
patent: 4448687 (1984-05-01), Wang
patent: 4693824 (1987-09-01), Sansone
patent: 4693825 (1987-09-01), Trouw
patent: 4746472 (1988-05-01), Kohn
Chen, Sr. Paul N.
Chung Tai-Shung
Provino Vincent J.
Foelak Morton
Hoechst Celanese Corporation
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