Fiber or foil from polymers with high tg and process for...

D - Textiles – Paper – 01 – D

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D01D 5/06 (2006.01) D01F 6/66 (2006.01) D01F 6/74 (2006.01)

Patent

CA 2739033

The invention relates to a process for the manufacture of a fiber or foil comprising at least one optionally function-alized polymer with a high Tg selected from the group consisting of poly(aryl ether sulfone) (PAES), poly(aryl ether ketone) (PAEK) and aromatic polyimide, comprising the steps of (aa) providing a solution comprising at least 45 wt. %, based upon the weight of the solution, of the polymer, and at least 20 wt. %, based upon the weight of the solution, of at least one halogen-free or-ganic solvent (S1) for the polymer; (bb) pushing the solution through a nozzle; and (cc) introducing the solution into a coagula-tion bath comprising (cc1) at least one liquid (L1) in which the polymer is insoluble, and optionally (cc2) at least one organic sol-vent (S2) for the polymer, identical to or different from the organic solvent (S1), to form a fiber or foil. The invention moreover relates to a fiber or foil obtained by this process as well as to fibers or foils with specific porosity features and/or mechanical prop-erties.

Linvention concerne un processus de fabrication dune fibre ou feuille comprenant au moins un polymère éventuellement fonctionnalisé à haute Tg et sélectionné parmi le groupe constitué par le poly(aryl éther sulfone) (PAES), le poly(aryl éther cétone) (PAEK) et le polyimide aromatique, comprenant les étapes consistant à (aa) fournir une solution comprenant au moins 45 % en poids, rapporté au poids de la solution, du polymère, et au moins 20 % en poids, rapporté au poids de la solution, dau moins un solvant organique sans halogène (S1) pour le polymère; (bb) pousser la solution à travers une buse; et (cc) introduire la solution à lintérieur dun bain de coagulation comprenant (cc1) au moins un liquide (L1) dans lequel le polymère est insoluble, et éventuellement (cc2) au moins un solvant organique (S2) pour le polymère, identique au solvant organique (S1) ou différent de celui-ci, pour former une fibre ou feuille. Linvention concerne en outre une fibre ou feuille obtenue par ce processus ainsi que des fibres ou feuilles dotées de caractéristiques de porosité et/ou propriétés mécaniques spécifiques.

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