PVC tube provided with a friction-reducing layer and method for the production thereof
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United States of America Patent
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Issued Date -
Feb 1, 2007
app pub date -
Jul 25, 2006
filing date -
Jul 26, 2005
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Abandoned
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Abstract
PVC tube having a friction-reducing layer applied to the inside. This friction-reducing layer includes a material that can be applied with co-extrusion such that it bonds directly to the PVC material that is likewise extruded. Such a friction-reducing layer preferably includes an ethylene acrylate copolymer. It is also possible to use a plastic that in itself does not bond to PVC for such a friction-reducing layer. The desired bonding characteristics can, however, be obtained by mixing such a plastic before extrusion with a plastic that bonds to PVC. Preferably, a friction-reducing lubricant, such as silicone oil, is incorporated in the plastic. The invention relates in particular to an electrical conduit.
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