Crosslinked polymeric material with enhanced strength and...

B - Operations – Transporting – 29 – C

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Details

B29C 55/30 (2006.01) A61F 2/34 (2006.01) A61L 27/16 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2586624

A radiation crosslinked (50 kGy), pressure-treated UHMWPE material has been developed by applying compressive force on a crosslinked polymer in a direction orthogonal to an axial direction. The deformed material is then cooled while held in a deformed state. The resulting material is anisotropic, with enhanced strength oriented along the axial direction. The directionally engineered 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 highly crosslinked UHMWPEs.

L'invention concerne un matériau UHMWPE traité sous pression et réticulé par rayonnement (50 kGy), développé par l'application d'une force de compression sur un polymère réticulé dans un sens orthogonal à un sens axial. Le matériau déformé est ensuite refroidi, tout en étant maintenu dans un état déformé. Le matériau obtenu est anisotrope avec une résistance améliorée orientée dans le sens axial. Le matériau à modification orientée est oxydativement stable même après quatre semaines de vieillissement accéléré dans un appareil sous pression contenant cinq atmosphères d'oxygène (ASTM F2003). Du fait de sa stabilité oxydative, le matériau traité par déformation convient à l'emballage perméable à l'air et à la stérilisation au gaz, jusqu'à présent réservés aux UHMWPE refondus et fortement réticulés.

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