Porous fluorine resin membrane and process for preparing the same
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsYoshihiko Mutoh, Morikazu Miura
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Abstract
The invention relates to a porous membrane made of a particular fluorine resin, having excellent chemical resistance, excellent thermal resistance, excellent filtration performance and excellent mechanical properties, and having uniform porous structure comprising minute pores, and also relates to a process for preparing the same. In particular, the invention relates to a porous membrane suited for a microfilter having excellent thermal resistance and excellent filtration performance, especially a porous membrane suited for a microfilter for use in purification of chemicals such as strong acid and strong alkali by utilizing the excellent chemical resistance, and also a process for preparing the same.
Claims3
A porous fluorine resin membrane comprising a fluorine resin selected from the group consisting of an ethylene-tetrafluoroethylene copolymer, an ethylene-chlorotrifluoroethylene copolymer and polychlorotrifluoroethylene, having a mean pore size of from 0.01 to 5.mu. and a porosity of 40 to 90%, and having a three dimensional network structure such that the symbol N designating the number of fibers constituted a network is N.gtoreq.2p/D per 1 mm in the thicknesswise direction of the membrane, wherein p represents a porosity (%) and D represents mean pore side (.mu.).
Dependencies are inferred from the claim text.