Manufacture of abrasion resistant composite extrusions

摘要

Methods for forming a composite extrusion for use as a glass run channel in an automobile and the products formed thereby are disclosed in which a main body member is formed from an elastomeric thermoset rubber and an abrasion resistant layer comprised of a crosslinkable thermoplastic or a high ethylene content EPDM rubber extruded thereon. The crosslinkable thermoplastic may be a moisture crosslinkable polyethylene containing grafted silane functional groups. The abrasion resistant layer may be extruded onto the thermoset either prior to or after the thermoset is cured and either prior to or after the abrasion resistant layer is crosslinked. The material of the abrasion resistant layer may be extruded into tape form and laminated onto the main body member.