Multi-layer fuel and vapor tube
AssigneeITT Corporation
InventorsDavid L. Noone, Frank L. Mitchell
Life of this patent
Estimating the term…
Abstract
A layered tubing for use in a motor vehicle composed of a thick outer tubing having an inner and an outer face, the outer tubing made of an extrudable thermoplastic such as a polyamide like Nylon 12; a thin intermediate bonding layer bonded to the inner face of the thick outer layer, the bonding layer composed of an extrudable melt-processible thermoplastic capable of sufficiently permanent laminar adhesion with the thick outer layer which is chemically dissimilar to the thermoplastic employed in the thick outer layer; an interior layer bonded to the intermediate bonding layer, the interior layer composed of a fluoroplastic which is resistant to permeation by and interaction with short-chain aliphatic and aromatic compounds; and an innermost electrostatic discharge layer.
Claims18
A layered tubing for use in a motor vehicle, the tubing comprising:
- a thick flexible outer tubing layer having a given thickness and an inner and an outer face, the outer tubing consisting essentially of an extrudable thermoplastic having an elongation value of at least 150% and an ability to withstand impacts of at least 2 foot-pounds at temperatures below about -20.degree. C.;
- an intermediate bonding layer bonded to the inner face of the thick outer layer, the bonding layer consisting essentially of an extrudable melt processible thermoplastic capable of sufficiently permanent laminar adhesion to the inner face of the outer tubing;
- an interior layer bonded to the intermediate bonding layer, the interior layer consisting essentially of an extrudable, melt-processible thermoplastic material capable of sufficiently permanent laminar adhesion with the intermediate bonding layer, the melt-processible thermoplastic which is chemically dissimilar to the thermoplastic employed in the thick outer layer, the chemically dissimilar thermoplastic being resistant to permeation by and interaction with short-chain aliphatic and aromatic hydrocarbon compounds;
- and
- an innermost electrostatic dissipation layer integrally bonded to the interior layer, the electrostatic dissipation layer consisting of an extrudable, melt-processible thermoplastic material capable of sufficiently permanent laminar adhesion with the intermediate bonding layer and of dissipating electrostatic energy, the electrostatic dissipation capacity being in a range between about 10.sup.-4 to 10.sup.-9 ohm/cm.sup.2.
A layered tubing for use in a motor vehicle, the tubing comprising:
- a thick flexible outer tubing having a given thickness and an inner and an outer face, the outer tubing consisting essentially of an extrudable polyamide having an elongation value of at least 150% and an ability to withstand impacts of at least 2 foot-pounds at temperatures below about -20.degree. C.;
- an intermediate bonding layer having a thickness between about 0.05 mm and about 0.1 mm bonded to the inner face of the thick outer layer, the bonding layer consisting essentially of an extrudable thermoplastic capable of sufficiently permanent laminar adhesion to the polyamide outer tubing;
- an interior layer bonded to the intermediate bonding layer, the interior layer having a thickness between about 0.05 mm and about 0.15 mm and consisting essentially of an extrudable, melt-processible thermoplastic material capable of sufficiently permanent laminar adhesion with the intermediate bonding layer, the melt-processible thermoplastic resistant to permeation by and interaction with short-chain aliphatic and aromatic hydrocarbon compounds selected from the group consisting of polyvinylidine fluoride, polyvinyl fluoride, copolymers of vinylidine difluoride and chlorotrifluoroethane copolymerized with polyvinylidine fluoride, copolymers of vinylidine difluoride and chlorotrifluoroethane copolymerized with polyvinyl fluoride, and mixtures thereof;
- and
- an innermost electrostatic dissipation layer integrally bonded to the interior layer, the electrostatic dissipation layer having a thickness between about 0.1 mm and about 0.2 mm and consisting essentially of an extrudable, melt-processible thermoplastic material capable of sufficiently permanent laminar adhesion with the intermediate bonding layer and of dissipating electrostatic energy, the electrostatic dissipation capacity being in a range between about 10.sup.-4 and about 10.sup.-9 ohm/cm.sup.2, the melt-processible thermoplastic consisting essentially of:
- between about 10% and about 18% by weight of a vinylidine fluoride-chlorotrifluoroethylene copolymer, the copolymer having between about 40% and 60% by weight vinylidine fluoride;
- between about 50% and about 70% by weight of a vinylidine fluoride-tetrafluoroethylene copolymer, the copolymer having between about 40% and about 60% by weight vinylidine fluoride;
- and
- between about 10% and about 25% by weight polyurethane.
Dependencies are inferred from the claim text.