Non-fibrous polymer solution of para-aramid with high...

D - Textiles – Paper – 01 – F

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D01F 6/60 (2006.01) C08J 3/09 (2006.01) C08J 5/18 (2006.01) C08K 3/16 (2006.01) C08L 77/10 (2006.01) D21H 13/26 (2006.01)

Patent

CA 2524914

The invention relates to a non-fibrous polymer solution essentially consisting of 1 to 8 wt.% Para-aramid, at least 50 mole% of the aromatic moieties thereof being unsul~stituted, in a mixture of a) a polar amide solvent selected from N- methyl-2~ pyrrolidone, N,NI-dimethylformamide, N,N'-dimethylacetamide, tetramethylurea, and mixtures thereof; b) between 0.7 mole of an alkali or earth alkali chloride per mole amide groups of the para-aramid and 7.5 wt.% of the alkali or earth alkali chloride, and c) water; and wherein at least 50 wt.% of the formed hydrochloric acid has been neutralized to obtain a solution having a dynamic viscosity which is at least a factor three smaller than the dynamic viscosity of the polymer solution without neutralization. The invention further pertains to a process making the same and para-aramid pulp- like fiber, paper and film made from said polymer solution.

L'invention concerne une solution polymère non fibreuse contenant principalement entre 1 et 8 % en poids de para-aramide, dont au moins 50 % molaire des groupes fonctionnels aromatiques correspondants sont insubstitués dans un mélange qui renferme a) un solvant d'amide polaire sélectionné parmi N-méthyl-2-pyrrolidone, N,N'-diméthylformamide, N,N'-diméthylacétamide, tétraméthylurée, et des mélanges associés, b) entre 0,7 mole d'un alcalin ou d'un chlorure alcalino-terreux par groupes d'amide molaire du para-aramide et 7,5 % en poids de l'alcalin ou du chlorure alcalino-terreux, et c) de l'eau. Au moins 50 % en poids de l'acide hydrochlorique formé ont été neutralisés afin d'obtenir une solution possédant une viscosité dynamique qui constitue au moins un facteur trois fois plus petit que la viscosité dynamique de la solution polymère sans neutralisation. Cette invention a aussi trait à un processus d'élaboration de ladite solution et de fibre similaire à la pâte de para-aramide, de papier et de film élaborés à partir de cette solution polymère.

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