Para-oriented aromatic polyamide porous film

Details Para-oriented aromatic polyamide porous film Para-oriented aromatic polyamide porous film

1996-11-25

1999-01-05

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528312, 528315, 528322, 5283291, 528332, 528335, 528336, 524600, 524606, 524607, 4284745, 264555, 264557, 264561, 264562, C08G 7310, C08G 6908, B32B 2708, B29C 3914

Patent

active

058564268

ABSTRACT:
A para-oriented polyamide porous film comprising a fibril having a diameter of not more than 1.mu., with fibrils planarly arranged as a network or nonwoven fabric and laminated in a layer, the thermal linear expansion coefficient at 200.degree.-300.degree. C. within .+-.50.times.10.sup.-6 /.degree.C. and 30-95% vacant spaces. Also, a battery separator using the porous film. Also, a production process of: (a) forming a film-like material from a solution containing 1-10% of a para-oriented aromatic polyamide having an inherent viscosity of 1.0-2.8 dl/g and 1-10% of a chloride of an alkali metal or an alkali earth metal in a polar amide or polar urea solvent; (b) maintaining the film-like material at not less than 20.degree. C. and not more than -5.degree. C. to deposit the para-oriented aromatic polyamide; and (c) immersing the film-like material in an aqueous or alcoholic solution to elute the sovlent and chloride of the alkali metal or alkali earth metal, then drying to obtain the para-oriented aromatic polyamide porous film. The film has uniformity and fine vacant spaces, which cannot be accomplished by a nonwoven fabric. Characteristics of a para-aramid (e.g., high heat resistance, high rigidity, high strength, etc.) are used.

REFERENCES:
patent: 5442003 (1995-08-01), Takahashi et al.

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