B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 71/56 (2006.01) H01M 2/16 (2006.01)
Patent
CA 2181421
A para-oriented aromatic polyamide porous film, the porous film of a para-oriented aromatic polyamide comprising a fibril having a diameter of not more than 1 µm and having a structure that fibrils are planary arranged in the form of a network or nonwoven fabric and laminated in the form of a layer, wherein a thermal linear expansion coefficient at 200 to 300°C of the film is within ~50 x 10 -6/°C and a percentage of vacant spaces is from 30 to 95%, a battery separator using the porous film, and a process for producing a porous film, comprising the following steps (a) to (c): step (a) of forming a film-like material from a solution containing 1 to 10% by weight of a para-oriented aromatic polyamide having an inherent viscosity of 1.0 to 2.8 dl/g and 1 to 10% by weight of a chloride of an alkali metal or an alkali earth metal in a polar amide solvent or a polar urea solvent; step (b) of maintaining the film-like material at the temperature of not less than 20°C or not more than -5°C to deposit the para-oriented aromatic polyamide; and step (c) of immersing the film-like material obtained in the step (b) in an aqueous solution or an alcoholic solution to elute the solvent and chloride of the alkali metal or alkali earth metal, followed by drying to obtain the para-oriented aromatic polyamide porous film. It is to provide a para-aramid porous film having an uniformity and fine vacant spaces, which can not be accomplished by a nonwoven fabric, a process for producing the same and a battery separator produced by using the para-aramid porous film, by making use of characteristics of a para-aramid (e. g. high heat resistance, high rigidity, high strength, etc.).
Takahashi Tsutomu
Tateno Tatsuo
Tsujimoto Yoshifumi
Fetherstonhaugh & Co.
Sumitomo Chemical Company Limited
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