| 摘要 |
PCT No. PCT/US94/07375 Sec. 371 Date Oct. 13, 1995 Sec. 102(e) Date Oct. 13, 1995 PCT Filed Jun. 30, 1994 PCT Pub. No. WO96/00657 PCT Pub. Date Jan. 11, 1996Automotive filler tubes require resistance to usual hydrocarbon fuel and mechanical properties to withstand collision forces. Tubes are fabricated from laminated rubbery structure reflecting the cooperative use of selected fluoropolymeric materials laminated with a rubbery copolymer like an epichlorohydrin elastomer to provide a flexible tubular article permitting only negligible escape of confined volatile hydrocarbons. A FKM rubbery polymer forms a relatively thin inner layer in the tube, a THV polymer forms a relatively thin intermediate layer and a relatively thick elastomeric polymer, e.g., ECO, forms a cover layer. In an alternative embodiment, a tube is formed from an inner layer of a THV fluoroplastic polymer and a cover layer of a relatively thick elastomeric polymer. The tubing is made by coextruding the FKM rubbery polymer and the THV fluoroplastic polymer, coating the THV fluoroplastic polymer layer with a binder, crosshead extruding the elastomeric polymer layer and cutting the tubing to lengths. The lengths are given a partial cure in straight condition to cross-link the THV fluoroplastic layer to the FKM rubber polymer layer and to the elastomeric layer. The partially cured lengths of tubing are shaped and then fully cured.
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