Process for the production of an ultrafiltration membrane from p

Details Process for the production of an ultrafiltration membrane from p Process for the production of an ultrafiltration membrane from p

1981-07-20

1984-11-13

Lawrence, Evan K.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642105, 2642888, 2642893, B29D 2704

Patent

active

044825145

ABSTRACT:
A process is disclosed for the production of a membrane suitable for ultrafiltration and cast from a solution in formic acid of a polyamide or a mixture of polyamides, characterized by bringing the solution produced with the addition of about 1 to 7% polyethylene glycol to a temperature below about 18.degree. C., applying the solution as thin layer onto a carrier film resistant to the constituents of the solution, conducting this solution through a precipitating and washing bath moving in the reverse direction, with said layer, subsequent to emerging from the bath, being stripped from the carrier film as a coagulated and washed membrane and dried thereafter. Preferred embodiments include stretching the membrane, prior to drying, to a ratio from 1.5:1 to 2.5:1; subjecting it to heat setting in conjunction with the drying; using a minimum formic acid concentration of 80% for the solution or mixture; using 12 to 22% polyamide in the solution or mixture; and employing an air stretch of 2 seconds, before the precipitating and washing bath.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3876738 (1975-04-01), Marinaccio et al.
patent: 4203847 (1980-05-01), Grandine
patent: 4340481 (1982-07-01), Mishiro et al.

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