Patent ID: 8329088
Filing Date: 2012-12-11
Classification: B29B,B29C,B29K

Abstract:
1. A process for injection overmolding a second polymer onto a crosslinked profile of a first polymer comprising the steps of: heating at least a portion of said crosslinked profile, said first polymer crosslinked to at least 65% to a temperature which raises the temperature of a skin of said portion of said first crosslinked profile from a first temperature to a second higher temperature for a duration sufficient to heat said crosslinked portion to said second temperature, said second temperature being below the temperature at which said first polymer begins to degrade, said crosslinked profile having been crosslinked from a method selected from the group consisting of radiation and silane, said second temperature of said skin of said portion of said crosslinked profile reaching a temperature of at least approximately 112° F. and less than approximately 269° F.; inserting at least a portion of said heated portion of said crosslinked profile while said heated crosslinked profile portion is still in a heated condition, at least partially into a mold, said mold containing a void for receiving a second polymer, the void co-acting with the crosslinked profile to define an overmolding profile; injection molding said second polymer over at least a portion of the heated portion of said crosslinked profile into the void of the mold; and crosslinking said second polymer, an affixation between said heated portion of said crosslinked profile and said second crosslinked polymer being able to pass a hot burst pressure test applicable to an intended end use for said combination of said overmolded polymer and crosslinked profile at 180° F. in which increasing test pressure within the first and second profiles causes a burst failure without any visible separation between said first and second profiles after said test.