POROUS MEMBRANE, PROCESS FOR PRODUCTION OF THE SAME, AND PROCESS FOR PRODUCTION OF INORGANIC SPHERES

摘要

The invention provides a porous membrane capable of producing a large amount of an emulsion containing droplets having small and highly uniform particle diameters in a short time; a process for the production of the membrane; a process for the production of inorganic spheres which makes it possible to produce stably inorganic spheres having small and highly uniform particle diameters with high productivity; and an emulsifier which makes it possible to produce a large amount of an emulsion containing droplets having small and highly uniform particle diameters in a short time. The invention relates to a porous membrane made of a fluororesin in which one of the surfaces of the membrane satisfies the requirement (X) and the other satisfies the requirement (Y): (X): the water contact angle is 80° or above and (Y): the water contact angle is 120° or below or droplets are absorbed into the membrane to result in immeasurable water contact angle. The porous membrane can be produced by a process for the production of porous membrane which comprises placing a protecting film on one of the surfaces of a hydrophilized fluororesin porous membrane and hydrophobizing the other of the surfaces of the membrane.