Embodiment of a microporous membranes asymmetrical by double irradiation, and the membranes obtained in this way

摘要

Method of manufacture of microporous membranes asymmetrical by double irradiation. / p & & p & a membrane 5 is subjected to two irradiations one of which has energy is insufficient to pass through it, but the other of which passes through this membrane 5. / p & & p & the irradiations create defects molecular that certain chemical attack preferably. It is thus obtained two arrays of pores, one of the large diameter and not of through 26, the other finer 27, 28, 29 and lead to on the two surfaces 31, 32 of the membrane 5. / p & & p & the possible applications are in the field of view of the filtration and