| abstract |
Shaped articles can be produced by subjecting a solution of polyoxadiazole series resin alone or in mixture with at least one inorganic salt in a concentrated sulfuric acid to be coagulated to wet process by using an aqueous solution of sulfuric acid, a lower aliphatic carboxylic acid, a mixture of these acids or a mixture of said acid or said mixture with at least one of inorganic acids and amide compounds as a coagulant and washing the wet-shaped articles obtained by this coagulation with water and then contacting with buffer solution, amine, amide compound or some salt of weak acid or some metal hydroxide. |