Cellulose fibres with improved elongation at break, and...

D - Textiles – Paper – 01 – F

Patent

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Details

D01F 2/28 (2006.01) D01F 2/00 (2006.01)

Patent

CA 2226305

Cellulose formate fibre and a cellulose fibre regenerated from cellulose formate are disclosed. The fibres have high toughness and modulus properties combined with improved elongation at break and energy at break. Specifically, their elongation at break is higher than 6 %. Methods for producing said fibres are also disclosed. The cellulose formate fibre is produced by dry-jet-wet spinning a cellulose formate liquid-crystal solution followed by a coagulation step and a neutral washing step both performed in acetone. The regenerated cellulose fibre is produced by treating a cellulose formate fibre in an aqueous solution with a high soda concentration. The spinning and regenerating methods may be performed sequentially and continuously. Furthermore, reinforcing assemblies based on such fibres, and articles reinforced using said fibres or assemblies, particularly tyre casings, are disclosed.

Fibre en formiate de cellulose et fibre en cellulose régénérée à partir du formiate de cellulose. Ces fibres présentent de hautes propriétés de ténacité et de module, combinées à des valeurs améliorées d'allongement à la rupture et d'énergie à la rupture. Leur allongement à la rupture, en particulier, est supérieur à 6 %. Procédés pour obtenir ces fibres. La fibre en formiate de cellulose est obtenue par filage d'une solution cristal-liquide de formiate de cellulose selon la méthode dite de "dry-jet-wet spinning", l'étape de coagulation et l'étape de lavage neutre qui suit étant toutes deux réalisées dans de l'acétone. La fibre en cellulose régénérée est obtenue par traitement d'une fibre en formiate de cellulose dans une solution aqueuse fortement concentrée en soude. Les procédés de filage et de régénération peuvent être mis en ouvre en ligne et en continu. Assemblages de renforcement à base de telles fibres. Articles renforcés par de tels fibres ou assemblages, ces articles renforcés étant notamment des enveloppes de pneumatiques.

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