D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
D01F 2/00 (2006.01) D01F 2/02 (2006.01) D01F 2/28 (2006.01)
Patent
CA 2268792
The invention concerns a coagulating agent for liquid crystal solutions with a base of cellulose substances, characterised in that it contains at least one water soluble additive selected from the group consisting of ammonia, amines of salt of these compounds, the additive being such that the pH of the said coagulating agent is greater than 6. A preferable additive is a salt selected from the group consisting of ammonium formates, acetates and phosphates, mixed salts of these compounds, or mixtures of these constituents, in particular diammonium orthophosphates (NH4)2HPO4. The invention also concerns a method for spinning a liquid crystal solution with a base of cellulose substances, using a coagulating agent as per the invention, in particular the method called "dry-jet-wet-spinning" as well as spun articles, fibers or films, obtained by these methods. The invention further concerns a cellulose fiber having toughness higher than 40 cN/tex, an initial modulus of elasticity higher than 1200 cN/tex and high fatigue strength: its breaking load degeneration DELTA F after 350 fatigue cycles in the so-called "specimen test", under a compression rate of 3.5 % and a tensile stress of 0.25 cN/tex, is less than 30 %.
Agent coagulant aqueux pour solutions cristal-liquide à base de matières cellulosiques, caractérisé en ce qu'il comporte au moins un additif soluble dans l'eau choisi dans le groupe constitué par l'ammoniac, les amines ou les sels de ces composés, l'additif étant tel que le pH dudit agent coagulant est supérieur à 6. Un additif préférentiel est un sel choisi dans le groupe constitué par les formiates, les acétates et les phosphates d'ammonium, les sels mixtes de ces composés, ou les mélanges de ce constituants, notamment l'orthophosphate diammonique (NH4)2HPO4. Procédé de filage d'une solution cristal-liquide à base de matières cellulosiques, mis en oeuvre avec un agent coagulant conforme à l'invention, notamment procédé dit de "dry-jet-wet-spinning"; articles filés, fibres ou films, obtenus selon ces procédés. Fibre cellulosique ayant une ténacité supérieure à 40 cN/tex, un module initial en extension supérieur à 1200 cN/tex et un résistance à la fatigue élevée, sa déchéance en force-rupture .DELTA.F après 350 cycles de fatigue au test dit "test de barreau", sous un taux de compression de 3,5 % et une contrainte de tension de 0,25 cN/tex, est inférieure à 30 %.
Cizek Vlastimil
Huston Rima
Meraldi Jean-Paul
Michelin Recherche Et Technique S.a.
Robic
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