Production of microfiltration membrane filter

Details Production of microfiltration membrane filter Production of microfiltration membrane filter

1983-05-31

1986-01-28

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2105002, 264DIG62, B29C 6720

Patent

active

045670099

ABSTRACT:
A microfiltration membrane is made up dissolving m-phenylenediamine-isophthalic acid copolymer, a high temperature aromatic polyamide, in one or more solvents selected from the group which consists of N-methylpyrrolidone, dimethylformamide and dimethylacetamide, and the resulting solution in the presence of two or more of these solvents, a structure-loosening agent such as water or a polyhydric alcohol, is cast. After gel formation in the film, the latter is washed free from solvents and dried. The microfiltration membrane has high bursting strength and a pore point of 0.05 to 10 microns and a high permeability.

REFERENCES:
patent: Re30352 (1980-07-01), Kwolek
patent: 3408315 (1968-10-01), Paine
patent: 3567632 (1971-03-01), Richter et al.
patent: 3969452 (1976-07-01), Ciliberti et al.
patent: 4229291 (1980-10-01), Walch et al.
patent: 4269967 (1981-05-01), Elfert et al.
patent: 4482514 (1984-11-01), Schindler

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