Process for preparing semipermeable membrane having selective pe

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ

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264217, 427358, 427336, 4273899, 2103213, 2105002, 106186, 106187, B29D 2700, B29H 720, B29D 702, B01D 1300

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active

042798469

ABSTRACT:
A semipermeable membrane suitable for the use in an artificial kidney of the filtration type is produced by preparing a solution of cellulose acetate in a solvent mixture consisting essentially of a solvent for cellulose acetate and a swelling agent and spreading said solvent on a substrate, the solvent being a mixture of dimethylformamide and acetone, the swelling agent being a mixture of cyclohexanone and water, the ratio by weight of the amount of dimethylformamide and that of acetone to that of the swelling agent being within the area defined by four points consisting of A (60, 20, 20), B (35, 45, 20), C (25, 35, 40) and D (50, 10, 40) in the triangular coordinates represented by FIG. 1; the ratio of cyclohexanone to water being in a range of from 0.8 to 1.3.

REFERENCES:
patent: 3822330 (1974-07-01), Muir et al.
patent: 4026978 (1977-05-01), Mungle et al.
patent: 4147622 (1979-04-01), Nassbaumer
First International Symposium on Water Desalination, Manjikian et al., pp. 1-9, Oct., 1965.

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