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A polymer laminate produced by crosshead extrusion suitable for wear resistant applications such as a vehile glass run channel comprises a layer of a weather resistant rubber such as an ethylene-propylenediene (EPDM) rubber and a layer of a wear resistant thermoplastic such as polypropylene. The lam

A polymer laminate produced by crosshead extrusion suitable for wear resistant applications such as a vehile glass run channel comprises a layer of a weather resistant rubber such as an ethylene-propylenediene (EPDM) rubber and a layer of a wear resistant thermoplastic such as polypropylene. The laminate is passed through an oven at an elevated temperature sufficient to cure the EPDM rubber, for example, at about 375°F., with ambient temperature cooling fluid being blown over the exposed surface of the polypropylene thermoplastic. The interior polypropylene surface or interface is heated by the EPDM rubber which is at a high temperature as a result of the heat of extrusion and heat generated by cure thereof. As a result, the polypropylene interior surface or interface melts and causes it to flow and form a mechanical bond with the EPDM rubber while the exposed surface as well as a substantial portion of the polypropylene is kept from melting by the cooling fluid. The EPDM rubber can be extruded in the form of a channel having a longitudinal web which supports and is bonded to the laminated polypropylene wear strip to form a glass run channel.

대표청구항 ▼

A process to form a laminate of a layer of a cured weather resistant rubber and a layer of thermoplastic comprising the steps of: extruding a layer of a curable weather resistant rubber having a first surface and a layer of the thermoplastic having a melting point of 350°F. or less and having a top

A process to form a laminate of a layer of a cured weather resistant rubber and a layer of thermoplastic comprising the steps of: extruding a layer of a curable weather resistant rubber having a first surface and a layer of the thermoplastic having a melting point of 350°F. or less and having a top surface and a bottom surface, said extruding step causing said bottom thermoplastic surface to form an interface with said curable weather resistant rubber first surface; bonding said curable weather resistant rubber and said thermoplastic layers by heating said weather resistant rubber layer to a curing temperature which is above the melting point of said thermoplastic layer, and cooling said top surface of said thermoplastic layer whereby only a portion of said thermoplastic layer at said interface is melted.