Weatherstrip for automotive glass window and the like
A weatherstrip for automotive and motor vehicle window glass comprises a glass contact layer overlying a base extrusion. The base extrusion is formed of a thermoplastic vulcanizate (TPV) comprising ethylene-propylene diene polymer (EPDM) and polypropylene. The glass contact layer is formed of a material composed predominantly of a thermoplastic polyolefin polymer and comprising a silicone-crosslinked thermoset polymer. The thermoset polymer may be the reaction product of a silane-grafted polyolefin and a silicone polymer.
1 . A weatherstrip for sealing a window in a motor vehicle comprising:
a base extrusion and
a glass contact layer overlying a portion of the base extrusion, said glass contact layer being composed predominantly of a continuous thermoplastic polyolefin phase and comprising a silicone-crosslinked network reinforcing said continuous polyolefin phase.
2 . The weatherstrip according to claim 1 wherein the continuous thermoplastic polyolefin phase comprises a high density polyethylene compound.
3 . The weatherstrip according to claim 1 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount greater than 80 weight percent.
4 . The weatherstrip according to claim 1 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount between about 85 and 95 weight percent.
5 . The weatherstrip according to claim 1 wherein said silicone-crosslinked network is a reaction product of silane-grafted polyolefin and a silicone polymer.
6 . The weatherstrip according to claim 4 wherein said silane-grafted polyolefin is silane-grafted polyethylene.
7 . The weatherstrip according to claim 5 wherein said silicone polymer is characterized by ultra high molecular weight.
8 . The weatherstrip according to claim 5 wherein said silicone polymer is characterized by a molecular weight between about 300,000 and 400,000.
9 . The weatherstrip according to claim 1 wherein said base extrusion is formed of a thermoplastic vulcanizate material.
10 . The weatherstrip according to claim 1 wherein said base extrusion is formed of an ethylene-propylene rubber material.
11 . A weatherstrip for sealing a window in a motor vehicle comprising:
a base extrusion and
a glass contact layer overlying a portion of said base extrusion, said glass contact layer being composed predominantly of a high density polyethylene compound and including a silicone-crosslinked network reinforcing said high density polyethylene compound.
12 . The weatherstrip according to claim 11 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount greater than 80 weight percent.
13 . The weatherstrip according to claim 11 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount between about 85 and 95 weight percent.
14 . The weatherstrip according to claim 11 wherein said silicone-crosslinked network is a reaction product of silane-grafted polyolefin and a silicone polymer.
15 . The weatherstrip according to claim 14 wherein said silane-grafted polyolefin is silane-grafted polyethylene.
16 . A weatherstrip for sealing a glass window in a motor vehicle comprising:
a base extrusion and
a glass contact layer secured to a portion of said base extrusion, said glass contact layer comprising a high density polyethylene compound and a silicone-crosslinked network reinforcing said high density polyethylene compound.
17 . The weatherstrip according to claim 16 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount greater than 80 weight percent.
18 . The weatherstrip according to claim 16 wherein said glass contact layer comprises a continuous thermoplastic polyolefin phase in an amount between about 85 and 95 weight percent.
19 . The weatherstrip according to claim 16 wherein said silicone-crosslinked network is a reaction product of silane-grafted polyolefin and a silicone polymer.
20 . The weatherstrip according to claim 16 wherein said silane-grafted polyolefin is silane-grafted polyethylene.