Process for producing meta-type aromatic polyamide filaments

D - Textiles – Paper – 01 – F

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D01F 6/60 (2006.01) C08G 69/46 (2006.01)

Patent

CA 2355316

To produce meta-type aromatic polyamide filaments having a good quality from a polymer solution of a meta-type aromatic polyamide produced by a solution polymerization method, with high efficiency, (1) a meta-type aromatic polyamide is prepared by polymerization-reacting a meta-type aromatic diamine with a meta-type aromatic dicarboxylic acid chloride in a polar organic solvent; (2) hydrogen chloride contained in the resultant polymer solution is neutralized with a neutralizing agent containing an alkali metal hydroxide which can react with hydrogen chloride to produce a salt thereof insoluble in the polymerization solvent; (3) the salt deposited from the polymer solution is removed by filtration; (4) the resultant polymer solution is mixed with water and a polar organic amide solvent to prepare a spinning solution; (5) the resultant meta-type aromatic polyamide spinning solution is directly extruded in the form of filamentary streams into an aqueous coagulation liquid, to coagulate the extruded filamentary streams of the polymer solution into the form of filaments; (6) the coagulated filaments are immersed in water to remove the salt and the solvent from the filaments; and (7) the water-washed filaments are drawn and heat-treated.

Cette invention a trait à un procédé permettant de produire, de façon satisfaisante, des fibres polyamides méta-aromatiques de bonne qualité à partir d'une solution de polyamide méta-aromatique obtenue par une polymérisation en solution. Le procédé consiste, (1), à polymériser une diamine méta-aromatique avec un chlorure dicarbonyle méta-aromatique dans un solvant organique polaire afin de préparer un polyamide méta-aromatique, (2), à neutraliser le chlorure d'hydrogène contenu dans la solution polymère résultante à l'aide d'un agent de neutralisation renfermant un hydroxyde de métal alcalin qui, en réagissant avec le chlorure d'hydrogène, produit un sel insoluble dans le solvant de polymérisation, (3), à retirer le sel précipité de la solution polymère par filtration, (4), à ajouter de l'eau et un solvant organique polaire du type amide à la solution polymère résultante afin de préparer une solution de filage, (5), à extruder la solution de filage résultante, contenant le polyamide méta-aromatique, sous forme de fibres et ce, directement dans un milieu solidifiant aqueux pour obtenir les fibres, (6), à plonger les fibres solidifiées dans de l'eau afin d'enlever le sel et le solvant et, (7), à étirer/chauffer les fibres rincées.

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