Patent US4329948A successfully refreshed from Google Patents.
Patent EP0325830A2 successfully refreshed from Google Patents.
EP0325830A2
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EP
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Cohesive bonding process for forming a laminate of a wear resistant thermoplastic and a weather resistant rubber
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1988-08-03
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Granted: —
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Expires: 2008-08-03
Abstract
Abstract A polymer laminate produced by crosshead extrusion suitable for wear resistant applications such as a vehicle glass run channel comprises a layer of a weather resistant rubber such as an ethylene-propylene-diene (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 20 which supports and is bonded to the polypropylene wear strip 34 to form a glass run channel 10.
Inventors
- 👤 Mark L. Brooks
- 👤 Keith E. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 08:09
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/08; B32B27/00; B32B27/32; B60; B60J; B60J10/00; B60J10/15; B60J10/17; B60J10/70; B60J10/74; B60J10/79; B32B2307/00; B32B2307/50; B32B2307/554; B32B2307/70; B32B2307/712; B32B2605/00; B32B2605/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24198; Y10T428/31504; Y10T428/31826; Y10T428/31833; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
26 words
A wear resistant polymer laminate, comprising: a thermoplastic layer having a melting point of less than 350°F adhesively free bonded to a weather resistant rubber layer.
Claim 2
Dependent Claim
26 words
A wear resistant polymer laminate, comprising: a thermoplastic layer having a melting point of less than 350°F adhesively free bonded to a weather resistant rubber layer.
Claim 3
Dependent Claim
47 words
A wear resistant polymer laminate according to Claim 1, wherein said weather resistant rubber is a styrene-butadiene rubber, a polychloroprene rubber, a nitrile-polyvinyl chloride rubber blend or an EPDM rubber, or combinations thereof, and wherein said thermoplastic wear resistant layer is mechanically bonded to said rubber layer.
Claim 4
Dependent Claim
55 words
A wear resistant polymer laminate according to claim 1 or claim 2, wherein said thermoplastic layer has an interior surface and an exposed surface, wherein said thermoplastic layer is bonded to said rubber layer by applying heat from said rubber to said thermoplastic interior surface while subjecting said thermoplastic exposed surface to a cooling fluid.
Claim 5
Dependent Claim
39 words
A wear resistant polymer laminate according to claim 3, wherein said thermoplastic layer is polyethylene or polypropylene having a density of from about 0.9 to about 1.2 grams per cc, and wherein said rubber layer is said EPDM rubber.
Claim 6
Dependent Claim
142 words
A polymer laminate, according to any one of the preceding claims, comprising an EPDM rubber layer and a polypropylene layer, wherein said EPDM rubber layer contains from about 45 percent to about 75 percent by weight of ethylene units therein based upon the total weight of said ethylene and propylene units, wherein said EPDM rubber layer contains from about 4 percent to about 15 percent by weight of non-conjugated diene units based upon the total weight of said EPDM rubber, said diene unit having from about 5 to about 10 carbon atoms, wherein said polypropylene layer has a melting point of from about 275°F to about 350°F, and wherein said polypropylene layer is laminated to said EPDM layer by means of transferring heat from said EPDM layer to said polypropylene layer such that at least a portion of said polypropylene layer melts.
Claim 7
Dependent Claim
80 words
A polymer laminate according to Claim 5, wherein said EPDM rubber layer contains from about 50 percent to about 60 percent by weight of ethylene units therein based upon a total weight of said ethylene and propylene units, wherein said non-conjugated diene of said EPDM rubber has from 6 to 9 carbon atoms, and wherein the amount of said non-conjugated diene unit is from about 6 to about 12 percent by weight based upon the total weight of said EPDM.
Claim 8
Dependent Claim
63 words
A polymer laminate according to Claim 6, wherein the amount of said non-conjugated diene is from about 8 percent to about 11 percent by weight based upon the total weight of said EPDM rubber, wherein said polypropylene density is from about 0.9 to about 1.1 grams per cc, and wherein the melting point of said polypropylene is from about 300°F to about 330°F.
Claim 9
Dependent Claim
87 words
A glass run strip having a base comprising: a weather resistant rubber gasket, said gasket having a base, said base having a longitudinal central web adjoined by two opposing sides to form a channel, each said side including a longitudinal flexible lip, each said lip extending towards each other and contacting each other to form a channel enclosure, and a thermo plastic wear strip, said thermoplastic wear strip being laminated to said longitudinal central web by a portion thereof melting and fusing with said weather resistant rubber.
Claim 10
Dependent Claim
87 words
A glass run strip having a base comprising: a weather resistant rubber gasket, said gasket having a base, said base having a longitudinal central web adjoined by two opposing sides to form a channel, each said side including a longitudinal flexible lip, each said lip extending towards each other and contacting each other to form a channel enclosure, and a thermo plastic wear strip, said thermoplastic wear strip being laminated to said longitudinal central web by a portion thereof melting and fusing with said weather resistant rubber.
Claim 11
Dependent Claim
45 words
A glass run strip according to Claim 8, wherein said weather resistant rubber gasket is a styrene-butadiene rubber, a polychloroprene rubber, a nitrile-polyvinyl chloride rubber blend, an EPDM rubber, or combinations thereof, and wherein said thermoplastic wearstrip has a melting point of 350°F or less.
Claim 12
Dependent Claim
28 words
A glass run strip according to Claim 9, wherein said thermoplastic is polyethylene or polypropylene having a density of from about 0.9 to about 1.2 grams per cc.
Claim 13
Dependent Claim
94 words
A glass run strip according to Claim 10, wherein said rubber is said EPDM rubber, wherein said EPDM rubber contains from about 45 percent to about 75 percent by weight of ethylene units therein based upon the total weight of said ethylene and propylene units, wherein said EPDM rubber gasket contains from about 4 percent to about 15 percent by weight of non-conjugated diene units based upon the total weight of said EPDM rubber, wherein said non-conjugated diene unit contains from about 5 to about 10 carbon atoms, and wherein said thermoplastic is polypropylene.
Claim 14
Dependent Claim
67 words
A glass run strip according to Claim 11, wherein the amount of said non-conjugated diene unit is from about 6 percent to about 12 percent by weight based upon the total weight of said EPDM rubber, wherein said polypropylene has a melting point of from about 300°F to about 330°F, and wherein said polypropylene has a density of from about 0.9 to about 1.1 grams per cc.
Claim 15
Dependent Claim
23 words
A glass run strip according to any one of the preceding claims wherein said wear strip is mechanically bonded to said rubber gasket.
Claim 16
Dependent Claim
128 words
A process to form a laminate of a layer of a weather resistant rubber and a layer of thermoplastic comprising the steps of: crosshead extruding a layer of the 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 crosshead extruding step causing said bottom thermoplastic surface to form an interface with said weather resistant rubber first surface; bonding said weather resistant rubber and said thermoplastic layers by heating said weather resistant rubber layer to a temperature above the melting point of said thermoplastic layer, and cooling the top surface of said thermoplastic layer whereby only a portion of said thermoplastic layer at said interface is melted.
Claim 17
Dependent Claim
128 words
A process to form a laminate of a layer of a weather resistant rubber and a layer of thermoplastic comprising the steps of: crosshead extruding a layer of the 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 crosshead extruding step causing said bottom thermoplastic surface to form an interface with said weather resistant rubber first surface; bonding said weather resistant rubber and said thermoplastic layers by heating said weather resistant rubber layer to a temperature above the melting point of said thermoplastic layer, and cooling the top surface of said thermoplastic layer whereby only a portion of said thermoplastic layer at said interface is melted.
Claim 18
Dependent Claim
80 words
A process according to Claim 14, wherein said weather resistant rubber layer is made from a styrene-butadiene rubber, a polychloroprene rubber, a nitrile-polyvinyl chloride rubber blend, an EPDM rubber, or combinations thereof, wherein said thermoplastic compound is polyethylene or polypropylene, wherein said rubber layer includes an enclosed channel, said channel including the rubber interface surface, and whereby said thermoplastic top surface is cooled by passing a fluid at a temperature below the melting point of said thermoplastic through said channel.
Claim 19
Dependent Claim
26 words
A process according claim 14 or claim 15, including crosshead extruding said thermoplastic layer under pressure against said weather resistant rubber layer, and cooling the laminate.
Claim 20
Dependent Claim
69 words
A process according to any one of claims 14 to 16 wherein said weather resistant rubber is said EPDM rubber, wherein said thermoplastic is said polypropylene, wherein said EPDM rubber has a ratio from about 50 to about 60 percent of ethylene units by weight of the ethylene and propylene units therein, and wherein said polypropylene has a density of from about 0.9 to about 1.2 grams per cc.
References Cited (Backward Citations)
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