Ultraporous and microporous membranes and method of making membr

Details Ultraporous and microporous membranes and method of making membr Ultraporous and microporous membranes and method of making membr

1991-03-26

1992-12-15

Jones, W. Gary

Liquid purification or separation

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264 41, B01D 3900

Patent

active

051714450

ABSTRACT:
Ultraporous and microporous polymer membranes cast from metastable dispersions are significantly improved by limiting the time of environmental exposure to less than about 0.5, preferably less than 0.25 seconds, between casting about 10.degree. to about 20.degree. C. lower than the usual prior art values. The resulting membranes have far less debris entrained in the membrane, far more consistent and uniform pore sizes, a substantially greater number of skin pores, and greatly increased flow rates for any given pore diameter.

REFERENCES:
patent: 3158532 (1960-12-01), Pall et al.
patent: 3883626 (1975-05-01), Kamide et al.
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4774039 (1988-09-01), Wrasidlo
Ewing, Galen W., Instrumental Methods of Chemical Analysis, Third Edition, pp. 36, and 58-62, MacGraw-Hill Book Company.

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