Abstract: A process for the surface treatment of an aluminum article characterized by dipping an aluminum article which has been anodically oxidized and which has a surface structure in an active state into a polymer latex thereby forming a water-insoluble polymer coating layer on the surface of said aluminum article, said polymer latex being prepared by polymerizing one or more of ethylenically unsaturated monomers in such a manner that polymer particles of said polymer latex are negatively charged and said polymer latex being adjusted to a pH value below 3.0.

Abstract: Microporous film having a microporous surface layer, and a method of producing it are provided. The method comprises placing a dope containing a film-forming polymer, a solvent therefor and an ionizable organic compound on a support and passing the dope bearing support through a coagulation bath under the application of an electric current. The resultant film has a microporous structure made up of open, vertically elongated and uniform cells.