High modulus crosslinked polyethylene with reduced residual...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

Reexamination Certificate

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C522S125000, C522S150000, C522S184000, C522S189000, C522S157000, C523S115000, C523S113000, C264S405000, C264S485000, C264S488000, C264S497000, C264S299000, C264S340000, C623S011110, C623S016110, C623S013120, C623S018110, C623S021110, C623S021120

Reexamination Certificate

active

08076387

ABSTRACT:
The present invention provides an irradiated crosslinked polyethylene containing reduced free radicals, preferably containing substantially no residual free radical. Disclosed is a process of making irradiated crosslinked polyethylene by irradiating the polyethylene in contact with a sensitizing environment at an elevated temperature that is below the melting point, in order to reduce the concentration of residual free radicals to an undetectable level. A process of making irradiated crosslinked polyethylene composition having reduced free radical content, preferably containing substantially no residual free radicals, by mechanically deforming the polyethylene at a temperature that is below the melting point of the polyethylene, optionally in a sensitizing environment, is also disclosed herein.

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