Production of asymmetrical microporous membranes by double irrad

Details Production of asymmetrical microporous membranes by double irrad Production of asymmetrical microporous membranes by double irrad

1987-11-20

1989-05-23

Powell, William A.

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156628, 156643, 156644, 156654, 156663, 156668, 2504921, 4283155, B44C 122, B32B 310

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048329975

ABSTRACT:
Process for the production of asymmetrical microporous membranes by double irradiation.
A membrane (5) is exposed to two irradiations, whereof one has an inadequate energy level to pass through the same, whereas the other passes through membrane (5).
The irradiations produce molecular defects, which are attacked or etched in preferred manner by certain chemical agents. Thus, two networks of pores are obtained, one network being of large diameter and of a non-issuing nature (26), the other being smaller (27, 28, 29) and which issue on to the two surfaces (31, 32) of membrane (5).
Application to filtration and sterilization.

REFERENCES:
patent: 3303085 (1967-02-01), Price et al.
patent: 3415993 (1968-12-01), Fleischer et al.
patent: 3612871 (1971-10-01), Crawford et al.
patent: 3616049 (1971-10-01), Moore et al.
patent: 3770532 (1973-11-01), Bean et al.
patent: 3802972 (1974-04-01), Fleischer et al.
IEEE Transactions on Nuclear Science NS-28(2), 1448-1451(1981) R. Spohr, "Heavy Ion Nuclear Tracks-An Emerging Technology".

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