Methods For Making Crosslinked Ultra High Molecular Weight Polyethylene

摘要

Method of preparing a crosslinked oxidation resistant ultrahigh molecular weight polyethylene polymer (UHMWPE) involves 1) forming a blend containing UHMWPE powder, a crosslinker, and optionally an antioxidant; 2) applying first conditions of pressure and heat to consolidate the UHMWPE and 3) applying second conditions of heat to activate the crosslinker and crosslink the consolidated UHMWPE. The crosslinker activates at high temperature and is peroxide free.

主权项

1. A method of preparing a crosslinked oxidation resistant ultrahigh molecular weight polyethylene for use in making a bearing component of an artificial joint implant, comprising:
forming a blend comprising UHMWPE powder and crosslinker; applying first conditions of pressure and heat at a first temperature to consolidate the UHMWPE; and applying second conditions of pressure and heat at a second temperature to activate the crosslinker and crosslink the consolidated UHMWPE;wherein the second temperature is higher than the first temperature and the crosslinker is activated at the second temperature,wherein the crosslinker comprises a carbon-carbon initiator that is free of peroxide groups and capable of thermally decomposing under the second conditions of heat and pressure into carbon-based free radicals by breaking at least one carbon-carbon single bond.