Method for making ultra high molecular weight polyethylene
US9586370B2 · kind B2 · utility
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118References
28Claims
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Key dates
| Filing date | Oct 11, 2013 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | May 15, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Heat treating UHMWPE by applying pressure with radial constraint at suitable times during a heating protocol reduces or eliminates cavitation, which is otherwise observed to occur when the UHMWPE is heated to a temperature above 300° C. Heat treated UHMWPE can undergo subsequent processing involving crosslinking, deformation, doping with antioxidant, and homogenizing or annealing. Heating during these steps can be carried out even above the onset melt temperature of the UHMWPE without loss of physical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.