PROCESS FOR PREPARING MEMBRANES

摘要

A process for preparing a composite membrane comprising the steps of: (i) applying to a porous support having an average surface energy of 1 to 30mN/m a composition having a viscosity of 1 to 5,000 mPa.s; and (ii) increasing the viscosity of the composition to a value higher than 30,000 mPa.s within 30 seconds after the composition has been applied to the support; wherein the composition applied in step (i) has a surface tension that is at least 25mN/m higher than the average surface energy of the porous support.