D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
D01F 6/60 (2006.01) D01D 5/06 (2006.01)
Patent
CA 2369681
A meta-type wholly aromatic polyamide containing, as principal repeating units, meta-phenylenediamine isophthalamide units is dissolved in an amide compound solvent; the resultant polymer solution is subjected to a wet-spinning procedure wherein the polymer solution is extruded in the form of filamentary streams into a coagulation bath containing an amide compound-containing solvent in a concentration of 40 to 70% by weight and having a temperature of 30 to 90°C, and water but substantially not containing salts, through spinning orifices of a spinneret, to coagulate the extruded filamentary polymer solution streams in the coagulation bath and to form coagulated porous undrawn filaments having a bulk density controlled to 0.3 to 1.0 g/cm3; the coagulated porous undrawn filaments are subjected to a drawing procedure wherein the porous undrawn filaments are drawn in a plasticizing drawing bath containing an aqueous solution of an amide compound solvent in a concentration of 20 to 70% by weight and having a temperature of 20 to 90°C; the resultant drawn filaments are washed with water, and the heat-treated (for example, further drawn at a draw ratio of 0.7 to 4.0 while being heated at a temperature of 250 to 400°C), to provide uniform and dense meta-type wholly aromatic polyamide fibers.
L'invention concerne un procédé pour produire une fibre de polyamide entièrement aromatique de type méta-aramide, homogène et dense. Ce procédé consiste à : dissoudre ledit polyamide, comprenant des motifs isophtalamide de m-phénylèneamine comme motifs récurrents principaux, dans un solvant constitué d'un composé amide pour préparer une solution polymère ; soumettre cette solution polymère à une étape de filage humide, ladite solution étant éjectée sous forme de fibre à travers l'orifice d'une filière dans un bain de coagulation contenant de l'eau et un solvant constitué d'un composé amide et pratiquement exempt de sels et la solution polymère fibreuse résultante qui s'écoule étant coagulée dans le bain de coagulation ; soumettre la fibre poreuse, non étirée, obtenue par coagulation, à une étape d'étirage, la fibre étant étirée dans un bain d'étirage plastifiant contenant une solution aqueuse d'un solvant constitué d'un composé amide ; laver à l'eau la fibre étirée résultante ; et soumettre ladite fibre à un traitement thermique (par ex. étirage de la fibre avec un rapport d'étirage compris entre 0,7 et 0,4 tout en la chauffant à une température comprise entre 250 et 400 DEG C).
Nakamura Tsutomu
Sadanobu Jiro
Toyohara Kiyotsuna
Borden Ladner Gervais Llp
Teijin Limited
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