Method for preparing a cellulose formate solution by...

C - Chemistry – Metallurgy – 08 – B

Patent

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C08B 3/04 (2006.01) B60C 9/00 (2006.01) C08B 1/02 (2006.01) C08J 5/18 (2006.01) C08L 1/10 (2006.01) D01F 2/28 (2006.01)

Patent

CA 2224416

A method for preparing a cellulose formate solution from cellulose slabs, particularly high-density slabs, without mechanically destroying said slabs in advance, is disclosed. The slabs are directly dissolved by impregnating the whole slabs in a formic acid-based liquid and kneading the resulting impregnated slabs in the presence of both formic acid and phosphoric acid. The method is preferably used to prepare ready-to-spin solutions, optionally and particularly together with an intermediate adjustment of the final composition. Solutions prepared by said method, cellulose objects made from such solutions, particularly fibres or films, assemblies of such fibres or films, and articles reinforced with such fibres, films or assemblies, said articles being, in particular, tyre treads, are also disclosed.

Procédé pour préparer une solution de formiate de cellulose à partir de plaques de cellulose, notamment de plaques de haute densité, sans destruction mécanique préalable de ces plaques. La dissolution des plaques est réalisée directement, grâce à une étape d'imprégnation des plaques entières dans un liquide à base d'acide formique, suivie d'une opération de malaxage des plaques ainsi imprégnées au contact à la fois de l'acide formique et de l'acide phosphorique. Le procédé est de préférence mis en oeuvre pour préparer des solutions prêtes à filer, avec notamment, si nécessaire, une opération d'ajustement intermédiaire de la composition finale. Solutions préparées à partir d'un tel procédé. Réalisation d'objets en cellulose à partir de ces solutions, notamment des fibres ou des films. Assemblages de tels fibres ou films. Articles renforcés par de tels fibres ou films ou assemblages, ces articles renforcés étant notamment des enveloppes de pneumatiques.

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