Process for preparing an asymmetric permselective membrane

Details Process for preparing an asymmetric permselective membrane Process for preparing an asymmetric permselective membrane

1980-04-08

1981-12-22

Lawrence, Evan K.

Coating processes

Foraminous product produced

Filter, sponge, or foam

264 41, 264 455, 264 49, 427246, 521 64, B05D 310, B05D 500

Patent

active

043071350

ABSTRACT:
Asymmetric reverse osmosis membranes are made from synthetic aromatic polyimides having a relatively high predominance of polar groups in the polymer backbone. A polar
on-polar group ratio of from 2:2 to 2:7 per imidized nitrogen link is required. Such membranes can be fabricated using conventional casting equipment by providing a solution of the polyimide in a good solvent and a poor solvent, the poor solvent being compatible with solution components at poor solvent/good solvent ratios of at least 1:1 up to about 7:1, casting a film of such solution, and partially evaporating the exposed surface of the cast film for 100.+-.30 seconds prior to gelation.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3852388 (1974-12-01), Kimura

Affiliated with

Also associated with

Rating

Process for preparing an asymmetric permselective membrane does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing an asymmetric permselective membrane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing an asymmetric permselective membrane will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2368158