Crosslinking of polyethylene for low wear using radiation and thermal treatments
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United States of America Patent
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Oct 5, 2004
Grant Date -
Mar 28, 2002
app pub date -
Feb 26, 2001
filing date -
Jul 9, 1996
priority date (Note) -
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Abstract
The present invention discloses methods for enhancing the wear-resistance of polymers, the resulting polymers, and in vivo implants made from such polymers. One aspect of this invention presents a method whereby a polymer is irradiated, preferably with gamma radiation, then thermally treated, such as by remelting of annealing. The resulting polymeric composition preferably has its most oxidized surface layer removed. Another aspect of the invention presents a general method for optimizing the wear resistance and desirable physical and/or chemical properties of a polymer by crosslinking and thermally treating it. The resulting polymeric compositions is wear-resistant and may be fabricated into an in vivo implant.
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