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US 6,615,877 B2Granted
Fuel line for a motor vehicle
AssigneeTi Group Automotive Systems (Fuldabruck) GmbH
InventorsWerner Zimmer, Kurt Apel, Thorsten Otto
Life of this patent
Estimating the term…
Abstract
A multilayer tubing for conveying liquid, especially motor vehicle fuel in a motor vehicle is extruded with an outer layer composed of nylon 12, an intermediate layer composed of an ethylene vinyl alcohol copolymer and an electrically-conductive inner layer composed of nylon 6 or nylon 12 and compounded with at most 30% by weight of conductive carbon black or graphite fibril.
Claims15
A multilayer tubing forming a motor-vehicle fuel line for conveying a liquid comprising:
- an outer layer composed of nylon 12;
- an intermediate layer coextruded with said outer layer and composed of an ethylene-vinyl alcohol copolymer;
- an electrically conductive inner layer coextruded with said outer and intermediate layer and composed of a nylon selected from the group which consists of nylon 6 and nylon 12 and compounded with an amount effective to render the inner layer electrically conductive and at most 30 percent by weight of at least one conductive substance selected from the group which consists of conductive carbon black and graphite fibrils, said inner layer containing at least 0.1 percent by weight of said conductive substance and sufficient to improve resistance of the nylon of said inner layer to ZnCl2;
- at least one bond-promoting layer between at least one of said inner and outer layers and said intermediate layer;
- and
- outwardly of said intermediate layer, at least one further nylon-containing layer.
3 more elements
A multilayer tubing forming a motor-vehicle fuel line for conveying a liquid comprising:
- an outer layer composed of nylon 12;
- an intermediate layer coextruded with said outer layer and composed of an ethylene-vinyl alcohol copolymer;
- an electrically conductive inner layer coextruded with said outer and intermediate layer and composed of a nylon selected from the group which consists of nylon 6 and nylon 12 and compounded with an amount effective to render the inner layer electrically conductive and at most 30 percent by weight of at least one conductive substance selected from the group which consists of conductive carbon black and graphite fibrils, said inner layer containing at least 0.1 percent by weight of said conductive substance and sufficient to improve resistance of the nylon of said inner layer to ZnCl2;
- and
- at least one bond-promoting layer between at least one of said inner and outer layers and said intermediate layer, at least one bond-promoting layer between said intermediate layer and said outer layer, said bond-promoting layer being composed of a polyolefin having a functional group.
2 more elements
A multilayer tubing forming a motor-vehicle fuel line for conveying a liquid comprising:
- an outer layer composed of nylon 12;
- an intermediate layer coextruded with said outer layer and composed of an ethylene-vinyl alcohol copolymer;
- an electrically conductive inner layer coextruded with said outer and intermediate layer and composed of a nylon selected from the group which consists of nylon 6 and nylon 12 and compounded with an amount effective to render the inner layer electrically conductive and at most 30 percent by weight of at least one conductive substance selected from the group which consists of conductive carbon black and graphite fibrils, said inner layer containing at least 0.1 percent by weight of said conductive substance and sufficient to improve resistance of the nylon of said inner layer to ZnCl2;
- and
- at least one bond-promoting layer between at least one of said inner and outer layers and said intermediate layer, at least one bond-promoting layer between said intermediate layer and said outer layer, said bond-promoting layer being composed of a polyolefin having a functional group, an additional nylon layer between said intermediate layer and said inner layer.
2 more elements
A multilayer tubing forming a motor-vehicle fuel line for conveying a liquid comprising:
- an outer layer composed of nylon 12;
- an intermediate layer coextruded with said outer layer and composed of an ethylene-vinyl alcohol copolymer;
- an electrically conductive inner layer coextruded with said outer and intermediate layer and composed of a nylon selected from the group which consists of nylon 6 and nylon 12 and compounded with an amount effective to render the inner layer electrically conductive and at most 30 percent by weight of at least one conductive substance selected from the group which consists of conductive carbon black and graphite fibrils, said inner layer containing at least 0.1 percent by weight of said conductive substance and sufficient to improve resistance of the nylon of said inner layer to ZnCl2;
- and
- at least one bond-promoting layer between at least one of said inner and outer layers and said intermediate layer, the intermediate layer having a thickness of 5 to 25% of a total wall thickness of said tubing.
2 more elements
A multilayer tubing forming a motor-vehicle fuel line for conveying a liquid comprising:
- an outer layer composed of nylon 12;
- an intermediate layer coextruded with said outer layer and composed of an ethylene-vinyl alcohol copolymer;
- an electrically conductive inner layer coextruded with said outer and intermediate layer and composed of a nylon selected from the group which consists of nylon 6 and nylon 12 and compounded with an amount effective to render the inner layer electrically conductive and at most 30 percent by weight of at least one conductive substance selected from the group which consists of conductive carbon black and graphite fibrils, said inner layer containing at least 0.1 percent by weight of said conductive substance and sufficient to improve resistance of the nylon of said inner layer to ZnCl2;
- and
- at least one bond-promoting layer between at least one of said inner and outer layers and said intermediate layer, 25 to 55% of a total wall thickness of said tubing lies inwardly of said intermediate layer.
2 more elements
Dependencies are inferred from the claim text.