A polymer-fibre prepreg, a method for the preparation...

B - Operations – Transporting – 29 – B

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B29B 11/16 (2006.01) A61K 6/00 (2006.01) A61K 6/083 (2006.01) A61L 27/48 (2006.01) C08J 5/24 (2006.01)

Patent

CA 2210661

The invention relates to a method for the preparation of the fibre product pre-impregnated with a polymer (prepreg) wherein the method comprises: a) coating the fibres with a powder comprising at least one polymer and optionally an agent having the ability to initiate the polymerization reaction of said polymer, b) adding to the composition obtained in step a) a solvent possessing the ability to dissolve said polymer but lacking the ability to initiate the polymerization reaction of said polymer, and c) evaporating the solvent. Alternatively, the polymer (optionally including the initiating agent) can first be dissolved in the solvent after which the fibres are contacted with the solution thus obtained and the solvent is evaporated. The surface of the fibres is preferably treated so as to facilitate the bonding of the polymer to the fibres, whereafter the surface treated fibres are coated with the polymer powder. The invention relates further to a novel prepreg, a method for the manufacture of fibre reinforced composite based on the use of said prepreg, the novel composites and their use.

L'invention concerne un procédé de préparation d'un produit fibreux préimprégné de polymère (pré-imprégné), qui consiste à: a) enduire les fibres d'une poudre comprenant au moins un polymère et éventuellement un agent capable d'amorcer la réaction de polymérisation dudit polymère, b) ajouter à la composition obtenue dans l'étape a), un solvant capable de dissoudre ledit polymère mais incapable d'amorcer la réaction de polymérisation dudit polymère, et c) laisser le solvant s'évaporer. On peut également, d'abord dissoudre dans le solvant le polymère (contenant éventuellement l'agent d'amorçage), après quoi on met les fibres en contact avec la solution ainsi obtenue et on laisse le solvant s'évaporer. On traite de préférence la surface des fibres de manière à faciliter la liaison du polymère avec les fibres, après quoi on enduit les fibres traités en surface de ladite poudre polymère. L'invention porte également sur un nouveau préimprégné, sur un procédé de fabrication d'un matériau composite renforcé par des fibres, basé sur l'utilisation dudit préimprégné, ainsi que sur lesdits nouveaux matériaux composites et leur utilisation.

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