POROUS FILM AND METHOD FOR PREPARATION THEREOF

摘要

A method for preparing a porous film wherein a porous film of a poly(vinylidene fluoride) based resin is prepared by dissolving the poly(vinylidene fluoride) based resin in a poor solvent through heating, to form a liquid raw material for a film, and then cooling the liquid raw material, to bring about a phase separation, characterized in that an organized clay being organized by a hydrophilic compound is dispersed in the above liquid raw material for a film in an amount of 1 to 25 parts by weight relative to 100 parts by weight of the poly(vinylidene fluoride) based resin; and a porous film prepared by the method. The above method allows the preparation of a porous film of a poly(vinylidene fluoride) based resin which has a microstructure providing a satisfactory mechanical strength and permeation performance capabilities and is improved in hydrophilic property, without the precise control of temperature before the above cooling.