Thermotropic aromatic polyester(amide) monofilament

Details Thermotropic aromatic polyester(amide) monofilament Thermotropic aromatic polyester(amide) monofilament

D - Textiles, Paper

01

F

D01F 6/84 (2006.01) D01D 5/088 (2006.01) D01F 6/82 (2006.01)

Patent

CA 2292753

The invention concerns a thermotropic aromatic polyester(amide) as-spun monofilament, verifying the following relationships: D ? 40; Te > 45; .DELTA.L ? 0, D being its diameter (in µm), Te its toughness (in cN/tex), and .DELTA.L being its variation in length (in %) after 2 minutes at 235 ± 5 ·C under prestress of 0.2 cN/tex. The invention also concerns the spinning method for obtaining such a monofilament, consisting in particular, at the die outlet, in structuring the polymer flow by drawing it in a gas fluid layer for a predetermined duration which is a function of the diameter D, before the resulting structured polymer flow is hot-dipped in a liquid for its solidification.

Monofilament brut de filage en polyester(amide) aromatique thermotrope, vérifiant les relations suivantes: D 40; Te > 45; .DELTA.L 0, D étant son diamètre (en µm), Te sa ténacité (en cN/tex), et .DELTA.L étant sa variation de longueur (en %) après 2 minutes à 235 ~ 5 ~C sous une prétension de 0,2 cN/tex. Procédé de filage pour obtenir un tel monofilament, consistant notamment, en sortie de filière, à structurer l'écoulement du polymère par étirage dans une couche de fluide gazeux pendant une durée prédéterminée fonction du diamètre D, avant de tremper thermiquement l'écoulement de polymère ainsi structuré dans un liquide, de manière à le solidifier.

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