Solid state deformation processing of crosslinked high...

C - Chemistry – Metallurgy – 08 – F

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C08F 110/02 (2006.01) A61L 27/16 (2006.01)

Patent

CA 2586618

Solid-state deformation processing of crosslinked high molecular weight polymers such as UHMWPE, for example by extrusion below the melt transition, produces materials with a combination of high tensile strength and high oxidative stability. The materials are especially suitable for use as bearing components in artificial hip and other implants. Treated bulk materials are anisotropic, with enhanced strength oriented along the axial direction. The material is oxidatively stable even after four weeks of accelerated aging in a pressure vessel containing five atmospheres of oxygen (ASTM F2003). Because of its oxidative stability, the deformation processed material is a suitable candidate for air-permeable packaging and gas sterilization, which has thus far been reserved for remelted crosslinked UHMWPE.

Cette invention concerne le traitement, par déformation à l'état solide, de polymères réticulés de poids moléculaire élevé, tels que le PEUHPM (UHMWPE). Par exemple, une extrusion en dessous de la transition de fusion produit des matériaux qui combinent une résistance à la traction et une stabilité à l'oxydation élevées. Les matériaux sont particulièrement appropriés pour servir de composants de roulement dans les hanches artificielles et autres implants. Les matériaux en vrac traités sont anisotropes et ont une solidité plus élevée dans le sens axial. Le matériau est stable à l'oxydation même après quatre semaines de vieillissement accéléré dans un récipient sous pression contenant cinq atmosphères d'oxygène (ASTM F2003). En raison de sa stabilité à l'oxydation, le matériau traité par déformation est un candidat approprié pour les emballages perméables à l'air et la stérilisation gazeuse, jusque-là réservée au PEUHPM (UHMWPE) réticulé refondu.

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