Ultra-high molecular weight polyolefin fiber composite...

B - Operations – Transporting – 32 – B

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18/951

B32B 27/12 (2006.01) B29C 70/40 (2006.01) C08J 5/04 (2006.01) C08L 23/06 (2006.01) H05K 1/03 (2006.01)

Patent

CA 2228598

The present invention relates to a polyolefin composite material based on fiber and a matrix of a polyolefin, selected from polyethylene and polypropylene possessing improved mechanical properties. The polyolefin composite comprises a network of fibers and matrix which have a molecular weight of above 500,000. This network is held together by compressed and crystallized molecular brush layers, obtained by the swelling of the external surface of said fibers and reciprocal entanglement with it of the polymer matrix. The composite material provides a tensile strength of at least 75 % of the volume average tenacity of the polyolefin fiber network and matrix. A process for obtaining a polyolefin composite material and the improved properties of the resulted product are also described.

L'invention concerne un matériau composite de polyoléfine à base de fibres et d'une matrice de polyoléfine, sélectionnée parmi polyéthylène et polypropylène possédant des propriétés mécaniques améliorées. Ce composite de polyoléfine comprend un réseau de fibres et de matrice, dont le poids moléculaire est supérieur à 500 000. Ce réseau est maintenu au moyen de couches en crin moléculaire cristallisé et comprimé, obtenues par gonflement de la surface extérieure desdites fibres et par enchevêtrement réciproque avec la surface extérieure de la matrice polymère. Ce matériau composite possède une résistance à la traction d'au moins 75 % de la résistance moyenne volumique du réseau de fibres et de matrice de polyoléfine. Elle concerne également un procédé de fabrication du matériau composite de polyoléfine, ainsi que les propriétés améliorées du produit obtenu.

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